A spare drawer storage device

Abstract

The application discloses a spare drawer storage device, which comprises a cabinet body, a cabinet door hinged to the cabinet body, a sealed cavity arranged in the cabinet body, a containing position for containing a spare low-pressure drawer unit slidably arranged in the cabinet body, a first air pressure adjusting assembly and a gas purification assembly; the first air pressure adjusting assembly comprises an air bag body mounted on the outer wall of the cabinet body, a plurality of pressure balance working air pipes communicated with the cabinet body and arranged at the bottom of the air bag body, and a gas pump arranged in the cabinet body and communicated with the pressure balance working air pipes; the gas purification assembly comprises a first purifier, an air inlet of the first purifier communicated with the gas pump, and an air outlet of the first purifier communicated with the cabinet body; after the low-pressure drawer unit to be stored is placed in the corresponding containing position in the cabinet and the cabinet door is closed, the first purifier performs deep purification on the gas released by the air bag body, and efficiently removes harmful components such as oxygen and water vapor in the air which can corrode conductive and transmission components.

Description

Technical Field

[0001] This application relates to the technical field of low-voltage switchgear and spare parts storage in substations equipped with low-voltage drawer-type switchgear, and in particular to a spare drawer storage device. Background Technology

[0002] Low-voltage drawer-type switchgear is a device typically used in electrical systems to distribute and control low-voltage electrical energy. They are commonly used in industrial, commercial, and residential buildings to receive electrical energy from medium- or high-voltage systems and distribute it to various low-voltage circuits. Their structure typically includes a cabinet and multiple low-voltage drawer units housed within it. Each low-voltage drawer unit can be installed and removed independently for easy maintenance and replacement. In actual operation, if a low-voltage drawer unit fails, a spare drawer is usually used to replace it, ensuring the continuous and stable operation of the electrical system.

[0003] However, under certain special environmental conditions: in southern regions, the air humidity and relative temperature are high, accelerating the corrosion rate of metals; in some special factory areas or environments, there are various corrosive gases such as sulfur dioxide, hydrogen sulfide, nitrogen oxides, ammonia, and ozone, which are corrosive to steel, copper, or silver; in coastal areas, island power distribution rooms, offshore operation platforms, and power distribution rooms of large ships, the air humidity is high and often contains corrosive components such as chloride ions; in steel plants, coal plants, and other places with heavy dust pollution; in addition to the above places, there are many other places where corrosive gases for steel, copper, or silver are present; these environmental factors easily cause corrosion to the conductive and transmission components of spare parts exposed to the air. For spare low-voltage drawer units, corrosion can occur on conductive contact surfaces, main contacts, propulsion mechanisms, and operating mechanisms, which can lead to the failure of the conductivity and transmission capabilities of the spare parts, seriously affecting the storage life of the spare low-voltage drawer unit and the reliability of its use after replacement, and in severe cases, serious failure of the spare parts may occur. Summary of the Invention

[0004] To reduce the corrosion of metal components inside a low-pressure drawer unit caused by corrosive components and dust in the air, a spare drawer storage device is provided.

[0005] The above-mentioned objective of this application is achieved through the following technical solution: A spare drawer storage device includes a cabinet body with a cabinet door hinged to the front, a sealed cavity formed inside the cabinet body, and a plurality of accommodating positions for accommodating spare low-pressure drawer units slidably disposed inside the cabinet body. It also includes a primary pressure regulating component and a gas purification component. The primary air pressure regulating component includes an airbag body installed on the outer wall of the cabinet. The bottom of the airbag body is provided with several pressure balancing working air pipes connected to the cabinet. The cabinet is provided with an air pump connected to the pressure balancing working air pipes. The gas purification assembly includes a first purifier installed inside the cabinet. The air inlet of the first purifier is connected to the air pump through a pipe, and the air outlet of the first purifier is connected to the cabinet, for providing dried and purified gas to the cabinet.

[0006] By adopting the above technical solution, the spare drawer storage cabinet constructs a highly sealed and controllable airtight cavity. After installing the low-pressure drawer units to be stored in their corresponding positions inside the cabinet and closing the cabinet door, the airbag body is connected to the cabinet body. This allows it to cope with different temperatures inside and outside the cabinet. When the temperature rises and the gas inside the cabinet expands, the excess gas pressure enters the airbag body for storage through the pressure balancing working air pipe, preventing a sudden increase in gas pressure. When the temperature drops and the gas inside the cabinet contracts, the airbag body releases the pre-stored gas through the pressure balancing working air pipe to replenish the gas pressure inside the cabinet. At the same time, the first purifier deeply purifies the gas released by the airbag body, effectively removing key factors such as moisture, chloride ions, and sulfides carried in the air that can cause electrochemical corrosion of copper busbars, terminals, and metal structural components inside the low-pressure drawer units. The treated clean gas is filled into the sealed cavity, extending the effective storage life of the spare low-pressure drawer units and ensuring their reliability for immediate use in emergency replacements. This is especially suitable for harsh industrial environments such as the southern coastal areas and chemical industrial parks.

[0007] Preferably, it also includes a secondary air pressure regulating component, which includes a high-pressure switch, a low-pressure switch, a high-pressure solenoid valve, and a low-pressure solenoid valve that are connected to the cabinet body through pipelines. The high-pressure switch and the high-pressure solenoid valve are electrically connected, the low-pressure switch and the low-pressure solenoid valve are electrically connected, and the outlet of the low-pressure solenoid valve is connected to the air inlet of the first purifier through a pipeline.

[0008] By adopting the above technical solution, when the airbag body's adjustment capacity is insufficient, the corresponding high-pressure solenoid valve or low-pressure solenoid valve is activated by the set high-pressure switch or low-pressure switch. The high-pressure solenoid valve directly exhausts air to the outside, quickly reducing pressure, while the low-pressure solenoid valve draws in air from the outside, avoiding the hazards of negative pressure. Furthermore, it forces all supplementary gas to pass through the first purifier, achieving precise control of on-demand gas replenishment and ensuring that the replenished gas is purified. This avoids energy waste and waste of purification resources, while ensuring the purity of the pressure balancing process.

[0009] Preferably, it also includes a three-stage air pressure regulating component, which further includes a high-pressure mechanical pressure relief valve and a low-pressure mechanical pressure relief valve as redundant safety protection. The inlet of the high-pressure mechanical pressure relief valve is connected to the cabinet body; the low-pressure mechanical pressure relief valve is installed in the cabinet body, and its airflow direction is unidirectional from the outside to the inside of the cabinet, and its outlet is connected to the first purifier through a pipeline.

[0010] By adopting the above technical solution, to prevent adverse effects caused by the failure of pressure switches or solenoid valves, a high-pressure mechanical pressure relief valve for outward exhaust and a low-pressure mechanical pressure relief valve for inward exhaust are installed. When the positive pressure inside the cabinet exceeds the preset value of the outward exhaust mechanical pressure relief valve, the high-pressure mechanical pressure relief valve operates, discharging excess gas to maintain the original pressure outside the cabinet; when the negative pressure inside the cabinet exceeds the preset value of the inward exhaust mechanical pressure relief valve, the low-pressure mechanical pressure relief valve operates, drawing in gas to maintain the original pressure inside the cabinet. Furthermore, the air drawn in during emergencies is still guided through the first purifier instead of being directly drawn into the cabinet, providing a fail-safe mechanism to prevent the intrusion of unpurified corrosive air and achieving a long-term and durable protection effect.

[0011] Preferably, a number of pairs of slide rails are fixedly installed inside the cabinet, and each pair of slide rails constitutes a receiving position; the outer walls on both sides of the low-pressure drawer unit are provided with pulleys that cooperate with the slide rails.

[0012] By adopting the above technical solution, the cooperative structure of the slide rail and pulley provides operators with a labor-saving and standardized operating method; moreover, the slide rail can precisely constrain and guide the movement path of the drawer unit, preventing the drawer unit from tilting when pushed or pulled, and protecting the delicate electrical components inside the drawer unit.

[0013] Preferably, the slide rail is provided with a limiting stop at the starting end of the low-pressure drawer unit's sliding to restrict the low-pressure drawer unit from sliding out completely.

[0014] By adopting the above technical solution, it is possible to effectively prevent the spare drawer unit from slipping off and falling to the ground due to improper operation when it is pulled out, thus avoiding mechanical damage and electrical component damage caused by the drawer unit falling, and improving the safety of equipment operation.

[0015] Preferably, the accommodating position is further provided with a limiting stop strip located at the sliding end of the low-pressure drawer unit, and the limiting stop strip abuts against the rear end of the low-pressure drawer unit.

[0016] By adopting the above technical solution, the limit stop can form a stable contact with its rear end when the low-pressure drawer unit is pushed into the sliding end, thereby achieving accurate positioning, preventing the drawer unit from being pushed in excessively due to inertia or improper operation, avoiding loosening or damage to internal electrical components due to impact, and further enhancing the stability of the drawer unit in the storage state.

[0017] Preferably, the accommodating positions at different heights within the cabinet are at different vertical heights to accommodate low-pressure drawer units of different heights.

[0018] By adopting the above technical solution, the storage cabinet can be compatible with storing spare low-pressure drawer units of different heights and models, which greatly improves the versatility and applicability of the equipment. Users do not need to configure different storage cabinets for different models of spare parts, thus reducing purchase and management costs.

[0019] Preferably, the inner wall of the cabinet is provided with a horizontal support mesh plate, which divides the sealed cavity into an upper compartment and a lower compartment, and the lower compartment is provided with several accommodating positions.

[0020] By adopting the above technical solution, the upper compartment is used to store spare parts other than the low-pressure drawer unit, and the lower compartment is used to store the low-pressure drawer unit. In this way, the space above and below the sealed cavity is used to store different products, thereby improving the space utilization rate inside the cabinet.

[0021] Preferably, the gas purification assembly further includes a second purifier, the air inlet of which is provided with a fan to drive gas circulation, and the air outlet of the second purifier is connected to the cabinet body.

[0022] By adopting the above technical solution, a second purifier is added on the basis of the first purifier. The first purifier is used to purify the gas filled into the cabinet, and the second purifier is located in the sealed cavity to purify the gas already present in the cabinet. The fan provides forced power and can actively draw the gas in the cabinet and circulate it through the second purifier for purification, ensuring that the air in the cabinet is fully, evenly and quickly treated, eliminating purification dead zones, and significantly improving purification efficiency and speed.

[0023] Preferably, it also includes a limit switch and a time relay. The limit switch is fixed to the inner wall of the cabinet and is triggered when the cabinet door is closed. The limit switch, the time relay and the air pump are electrically connected.

[0024] By adopting the above technical solution, the cabinet door closing triggers the limit switch to start the air pump to start working, establish positive pressure and purify the environment. The time relay controls the working time of the air pump, avoiding energy waste and equipment idling caused by continuous operation of the air pump, thus realizing intelligent and energy-saving operation.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. Through the coordinated operation of the air pressure regulating component and the gas purification component, a clean storage environment is actively constructed and maintained. The air pressure inside the cabinet is regulated in real time by the airbag body and the air pump. During the air pressure regulation process, the intrusion of high humidity and high corrosive air from the outside is effectively blocked. All air entering the cabinet is forced to pass through the first and second purifiers for treatment, which efficiently removes corrosive components such as water molecules, chloride ions, and sulfides. The purity of the closed air inside the cabinet is maintained for a long time without opening or closing the door. This greatly inhibits the occurrence of metal electrochemical corrosion, avoids the corrosion of metal parts of spare parts and spare low-pressure drawer units, ensures that the mechanical and electrical performance of the components is basically maintained in its initial state, and improves the storage life of each low-pressure drawer unit and the reliability of use after replacement. 2. When the airbag body's adjustment capacity is insufficient, the corresponding high-pressure solenoid valve or low-pressure solenoid valve is activated by the high-pressure switch or low-pressure switch respectively. The high-pressure solenoid valve directly exhausts air to the outside, quickly reducing the pressure, while the low-pressure solenoid valve draws in air from the outside, avoiding the hazards of negative pressure. Furthermore, it forces all replenished gas to pass through the first purifier, achieving precise control of replenishing gas on demand and ensuring that the replenished gas is purified. This avoids the waste of energy and purification resources, while ensuring the purity of the pressure balancing process. 3. When the regulating capacity of the high-pressure solenoid valve or the low-pressure solenoid valve is insufficient, the high-pressure mechanical pressure relief valve operates to discharge excess gas to maintain the original pressure outside the cabinet; the low-pressure mechanical pressure relief valve operates to draw in gas that is insufficient to maintain the original pressure inside the cabinet; and the emergency-drawn air is still guided through the first purifier instead of being directly drawn into the cabinet, providing a fail-safe mechanism to prevent the intrusion of unpurified corrosive air and achieving emergency protection. Attached image description: Figure 1 This is a schematic diagram of the spare drawer storage device; Figure 2 Cross-section of spare drawer storage unit Figure 1 ; Figure 3 This is an exploded diagram of the low-pressure drawer unit and the slide rail; Figure 4 This is a schematic diagram of an explosion of a primary pressure regulating component. Figure 5 This is a schematic diagram of the installation of the primary air pressure regulating component; Figure 6 This is a schematic diagram showing the installation of the two-stage and three-stage air pressure regulating components; Figure 7 Cross-section of spare drawer storage unit Figure 2 ; Figure 8 This is a schematic diagram of an air purifier exploding.

[0026] Attached reference numerals: 1. Cabinet body; 11. Cabinet door; 12. Sealed cavity; 121. Upper compartment; 122. Lower compartment; 13. Support mesh panel; 14. Storage position; 15. Slide rail; 151. Limiting block; 152. Limiting strip; 2. Low-pressure drawer unit; 21. Pulley; 3. Primary air pressure regulating assembly; 31. Airbag enclosure; 32. Airbag body; 321. Pressure balancing working air pipe; 33. Air pump; 34. Airbag pull rope; 4. Secondary 41. Pressure regulating component; 42. High-pressure switch; 43. Low-pressure switch; 44. High-pressure solenoid valve; 5. Low-pressure solenoid valve; 6. Three-stage pressure regulating component; 51. High-pressure mechanical pressure relief valve; 52. Low-pressure mechanical pressure relief valve; 7. Gas purification component; 61. First purifier; 62. Second purifier; 63. Impurity gas adsorption chamber; 64. Bag rack; 65. Adsorption cotton; 66. Fan; 7. Instrument box; 8. Limit switch; 9. Time relay. Detailed implementation method: The following section provides a more detailed description, in conjunction with the accompanying diagrams: As attached Figure 1 As shown, a spare drawer storage device includes a cabinet 1. The cabinet 1 includes a cabinet door 11 hinged to the front and a sealed cavity 12 formed inside. The cabinet door 11 is hinged to the front of the cabinet 1 by hinges and other components, making it convenient for staff to open and close. When the cabinet door 11 is closed, it cooperates with the cabinet 1 to form a relatively sealed space, which can prevent the entry of humid or corrosive air from the outside. The cabinet 1 is assembled from several sheet metal parts, and all the joints of the sheet metal parts of the cabinet 1 are fully welded. The structure of the cabinet 1 is suitable for storage cabinets or storage boxes, ensuring that storage devices of different shapes can realize storage functions.

[0027] As attached Figure 2 and attached Figure 3 As shown, the inner wall of the cabinet 1 is horizontally provided with a support mesh plate 13. The support mesh plate 13 divides the sealed cavity 12 into an upper compartment 121 and a lower compartment 122. The upper compartment 121 is used to store spare parts, such as primary plugs, secondary plugs, fuses, contactors, circuit breakers, etc. The lower compartment 122 is provided with several accommodating positions 14 for accommodating spare low-voltage drawer units 2. Several pairs of slide rails 15 are fixedly installed on the inner walls on both sides of the cabinet 1. The slide rails 15 in the same pair are relatively parallel, and each pair of slide rails 15 constitutes an accommodating position 14. When there is spare space in the lower compartment 122, the slide rails 15 can also be replaced with the support mesh plate 13 to achieve the effect of common use for the upper compartment 121 and the lower compartment 122. In addition, a special placement rack can be customized according to the spare parts to be stored.

[0028] The low-pressure drawer unit 2 has pulleys 21 on both outer walls that cooperate with the slide rail 15. The slide rail 15 can precisely constrain and guide the movement path of the drawer unit, prevent the drawer unit from tilting when pushed or pulled, and protect the delicate electrical components inside the drawer unit.

[0029] The storage positions 14 at different heights inside the cabinet 1 have different vertical heights to accommodate low-pressure drawer units 2 of different heights, enabling the storage cabinet to store spare low-pressure drawer units 2 of different heights and models, greatly improving the versatility and applicability of the equipment.

[0030] The slide rail 15 is provided with a limit stop 151 at the starting end of the sliding of the low-pressure drawer unit 2 to prevent the low-pressure drawer unit 2 from sliding out completely. The limit stop 151 is a metal block and is fixed to the slide rail 15 by welding or bolt connection. The function of the limit stop 151 is to prevent the low-pressure drawer unit 2 from sliding out completely from the receiving position 14 when it is in use, so as to avoid damage to the low-pressure drawer unit 2 or causing safety hazards.

[0031] The accommodating position 14 is also provided with a limiting stop 152 located at the sliding end of the low-pressure drawer unit 2, and the limiting stop 152 abuts against the rear end of the low-pressure drawer unit 2, thereby achieving accurate positioning and preventing the drawer unit 2 from being pushed in excessively due to inertia or improper operation, and avoiding loosening or damage to internal electrical components due to impact.

[0032] As attached Figure 4 and attached Figure 5 As shown, a spare drawer storage device further includes a primary air pressure regulating component 3, a secondary air pressure regulating component 4, a tertiary air pressure regulating component 5, and a gas purification component 6. The primary air pressure regulating component 3 includes an airbag enclosure 31 and an airbag body 32. The airbag enclosure 31 is plate-shaped and is fixedly installed on the top of the cabinet 1 by welding screws. There are four airbag enclosures 31 here, which surround and fix each other to form a placement space. The airbag body 32 is made of elastic material and is installed in the placement space. The volume of the airbag body 32 is slightly smaller than the placement space. The airbag enclosure 31 can limit the outer periphery of the airbag body 32. The airbag body 32 is usually made of rubber material with good elasticity and sealing properties, and can expand or pop up according to the change of internal gas volume.

[0033] The bottom of the airbag body 32 is fixedly connected to a pressure balancing working air pipe 321. There are two pressure balancing working air pipes 321 here. The airbag body 32 is connected to the inside of the cabinet 1 through the pressure balancing working air pipes 321. An air pump 33 is fixed on the inner wall of the top of the cabinet 1. One end of the air pump 33 is connected to one of the pressure balancing working air pipes 321, and the other end of the air pump 33 is connected to the inside of the cabinet 1. The function of the air pump 33 is to assist the circulation of gas between the cabinet 1 and the airbag body 32. When the temperature rises and the gas inside the cabinet expands, the excess gas pressure enters the airbag body 32 for storage through the pressure balancing working air pipe 321 to prevent the gas pressure from rising suddenly. When the temperature drops and the gas inside the cabinet contracts, the airbag body 32 releases the pre-stored gas through the pressure balancing working air pipe 321 to replenish the gas pressure inside the cabinet, forming a first-level gas pressure regulation in the sealed cavity 12.

[0034] An airbag pull cord 34 is provided between the top of the airbag enclosure 31 and the top of the airbag body 32 to connect the two. The airbag pull cord 34 is made of elastic material. By precisely controlling the length of the airbag pull cord 34, it is ensured that the airbag body 32 is always in the middle position between the minimum contraction and the maximum expansion after the door is closed. The restraining effect of the airbag pull cord 34 can prevent the airbag body 32 from being over-compressed, ensuring that it always has effective gas regulation capability, and preventing the airbag body 32 from collapsing due to excessive looseness or being overly tight to restrict the expansion space.

[0035] As attached Figure 5 and attached Figure 6 As shown, an instrument box 7 is also fixed on the top of the cabinet 1. The secondary air pressure regulating component 4 also includes a high-pressure switch 41, a low-pressure switch 42, a high-pressure solenoid valve 43, and a low-pressure solenoid valve 44 located in the instrument box 7. The high-pressure switch 41 and the low-pressure switch 42 are electrical control components. The high-pressure switch 41 is electrically connected to the high-pressure solenoid valve 43, and the low-pressure switch 42 is electrically connected to the low-pressure solenoid valve 44. When the high-pressure switch 41 or the low-pressure switch 42 detects that the air pressure inside the cabinet 1 has reached the set value, it will trigger the corresponding solenoid valve to act.

[0036] Both the high-pressure solenoid valve 43 and the low-pressure solenoid valve 44 are connected to the inside of the cabinet 1. The high-pressure solenoid valve 43 and the low-pressure solenoid valve 44 are generally electromagnetically controlled valves. When the airbag body 32 has insufficient adjustment capacity, the high-pressure switch 41 or the low-pressure switch 42 will activate the corresponding electrically connected high-pressure solenoid valve 43 or low-pressure solenoid valve 44 respectively. When the air pressure is too high, the high-pressure solenoid valve 43 will directly exhaust air to the outside and quickly reduce the pressure. When the air pressure is too low, the low-pressure solenoid valve 44 will draw air from the outside to avoid the harm of negative pressure, thereby forming a two-stage air pressure regulation in the sealed cavity 12.

[0037] The three-stage air pressure regulating assembly 5 includes a high-pressure mechanical pressure relief valve 51 and a low-pressure mechanical pressure relief valve 52. The high-pressure mechanical pressure relief valve 51 is located inside the instrument box 7 and is connected to the sealed cavity 12. When the air pressure inside the cabinet 1 is too high, the high-pressure mechanical pressure relief valve 51 promptly discharges the gas in the sealed cavity 12. The low-pressure mechanical pressure relief valve 52 is installed upside down on the inner wall of the top of the cabinet 1 and is connected to the instrument box 7. When the air pressure inside the cabinet 1 is too low, it draws in gas from the outside and into the sealed cavity 12. The high-pressure mechanical pressure relief valve 51 and the low-pressure mechanical pressure relief valve 52 serve as the three-stage air pressure regulator for the cabinet 1.

[0038] As attached Figure 7 and attached Figure 8 As shown, the gas purification component 6 includes a first purifier 61 and a second purifier 62 installed inside the cabinet 1. Both the first purifier 61 and the second purifier 62 are box-shaped structures. The first purifier 61 is fixedly installed on the top inner wall of the cabinet 1, and the second purifier 62 is fixedly installed on the bottom inner wall of the cabinet 1. Both the first purifier 61 and the second purifier 62 have impurity gas adsorption chambers 63, and the impurity gas adsorption chambers 63 are equipped with hanging bag racks 64 for hanging adsorbents. The adsorbents can be activated carbon, molecular sieves, etc., which have strong adsorption capacity and can effectively adsorb moisture, chloride ions, sulfides and other key factors in the air that can cause electrochemical corrosion of copper busbars, terminals and metal structural parts inside the low-pressure drawer unit 2.

[0039] Both the first purifier 61 and the second purifier 62 are equipped with absorbent cotton 65 for filtering gas at one end of the air inlet. The gas in the sealed cavity 12 will first pass through the absorbent cotton 65 and then flow into the impurity adsorption cavity 63. As a pre-filter, the absorbent cotton 65 can effectively filter out dust, particulate matter and other impurities in the air, prevent these impurities from clogging the pores of the subsequent adsorbent, and ensure the stability of the purification efficiency.

[0040] As attached Figure 6 and attached Figure 7 As shown, the air inlet of the first purifier 61 is connected to the air outlet of the air pump 33, the air outlet of the low-pressure solenoid valve 44, and the air outlet of the low-pressure mechanical pressure relief valve 52 through pipes. The air outlet of the first purifier 61 is connected to the sealed cavity 12. The gas released by the air pump 33, the low-pressure solenoid valve 44, and the low-pressure mechanical pressure relief valve 52 must be adsorbed and purified by the adsorbent in the first purifier 61 before it can be discharged into the sealed cavity 12. The adsorbent can adsorb and remove elements such as moisture, chloride ions, and sulfides carried in the air, and deliver the purified gas to the sealed cavity 12 to improve the environment inside the cabinet.

[0041] The air outlet of the second purifier 62 is connected to the sealed cavity 12. The air inlet of the second purifier 62 is equipped with a fan 66 to drive gas circulation. In actual use, a humidity sensor that is electrically connected to the fan 66 is usually fixed on the inner wall of the cabinet 1. When the humidity sensor detects that the humidity of the sealed cavity 12 is high, it will automatically start the fan 66, so that the gas in the cabinet 1 flows through the second purifier 62 at the bottom for adsorption and purification under the active drive of the fan 66.

[0042] A limit switch 8 is fixedly connected to the inner wall of the cabinet 1 for the cabinet door 11 to abut against and trigger. A time relay 9 is also provided in the instrument box 7. The limit switch 8, the time relay 9 and the air pump 33 are electrically connected. When the cabinet door 11 is closed, the limit switch 8 will be triggered, and the limit switch 8 will trigger the air pump 33 at the top. The gas released by the air pump 33 flows through the first purifier 61 at the top of the cabinet 1 and then flows into the sealed cavity 12. At the same time, the time relay 9 controls the working time of the air pump 33 to avoid the continuous operation of the air pump 33, which would cause energy waste and equipment idling, thus realizing intelligent and energy-saving operation.

[0043] The implementation principle of this embodiment is as follows: The system operates by combining three-stage pressure regulation with multi-stage gas purification. First, a primary regulation mechanism consisting of the airbag body 32 and the air pump 33 is used to address changes in gas volume inside the cabinet caused by temperature variations. The airbag body 32 releases or absorbs gas through contraction and expansion, maintaining a stable base pressure. When the airbag's regulation capacity is insufficient, the high and low pressure switches 42 control the opening and closing of the corresponding solenoid valves, forming a secondary intelligent regulation. The high-pressure branch exhausts and reduces pressure, while the low-pressure branch draws in external air, which is then purified by the first purifier 61 before being replenished, ensuring pressure balance and gas purity. The third stage is provided by a mechanical pressure relief valve for redundant protection. In the event of a fault in the electrical control system, the valve mechanically activates to prevent damage from overpressure or negative pressure, and the drawn-in air is still purified. Meanwhile, the gas purification component 6 processes all the incoming air pre-stored and replenished by the airbag body 32 through the first purifier 61. The second purifier 62, driven by the fan 66, circulates and purifies the gas exchanged between the cabinet 1 and the outside when the door is opened and closed. Both the first purifier 61 and the second purifier 62 adopt a replaceable adsorbent hanging bag structure and are combined with the pre-filter of adsorbent cotton 65 to efficiently adsorb key factors such as moisture, chloride ions, and sulfides carried in the air that can cause electrochemical corrosion of copper busbars, wiring terminals, and metal structural parts in the low-pressure drawer unit 2. The entire system is automatically started and stopped through the linkage of the limit switch 8, the cabinet door 11, and the time relay. After the door is closed, a clean storage environment is automatically established and maintained, thereby fundamentally inhibiting metal electrochemical corrosion and ensuring the reliability and safety of long-term storage of the spare drawer unit.

[0044] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of protection claimed in this application.

Claims

1. A spare drawer storage device, comprising a cabinet (1), wherein a cabinet door (11) is hinged to the front of the cabinet (1), and a sealed cavity (12) is formed inside the cabinet (1), characterized in that, The cabinet (1) is slidably provided with several accommodating positions (14) for accommodating spare low-pressure drawer units (2), and also includes a primary air pressure regulating component (3) and a gas purification component (6). The first-level air pressure regulating component (3) includes an airbag body (32) installed on the outer wall of the cabinet (1). The bottom of the airbag body (32) is provided with several pressure balancing working air pipes (321) connected to the cabinet (1), and the cabinet (1) is provided with an air pump (33) connected to the pressure balancing working air pipes (321). The gas purification component (6) includes a first purifier (61) installed inside the cabinet (1). The air inlet of the first purifier (61) is connected to the air pump (33) through a pipe, and the air outlet of the first purifier (61) is connected to the inside of the cabinet (1) to provide purified gas to the inside of the cabinet (1).

2. The spare drawer storage device according to claim 1, characterized in that, It also includes a secondary air pressure regulating component (4), which includes a high-pressure switch (41), a low-pressure switch (42), a high-pressure solenoid valve (43), and a low-pressure solenoid valve (44) connected to the cabinet (1) through a pipeline. The high-pressure switch (41) and the high-pressure solenoid valve (43) are electrically connected, the low-pressure switch (42) and the low-pressure solenoid valve (44) are electrically connected, and the outlet of the low-pressure solenoid valve (44) is connected to the air inlet of the first purifier (61) through a pipeline.

3. A spare drawer storage device according to claim 2, characterized in that, It also includes a three-stage air pressure regulating component (5), which further includes a high-pressure mechanical pressure relief valve (51) and a low-pressure mechanical pressure relief valve (52) as redundant safety protection. The inlet of the high-pressure mechanical pressure relief valve (51) is connected to the cabinet (1); the low-pressure mechanical pressure relief valve (52) is installed in the cabinet (1), and its airflow direction is unidirectional from the outside to the inside of the cabinet, and its outlet is connected to the first purifier (61) through a pipeline.

4. A spare drawer storage device according to claim 1, characterized in that, The cabinet (1) is fixedly provided with several pairs of slide rails (15), and each pair of slide rails (15) constitutes a receiving position (14); the outer walls on both sides of the low-pressure drawer unit (2) are provided with pulleys (21) that cooperate with the slide rails (15).

5. A spare drawer storage device according to claim 4, characterized in that, The slide rail (15) is located at the sliding start end of the low-pressure drawer unit (2) and is provided with a limiting stop (151) to restrict the low-pressure drawer unit (2) from sliding out completely.

6. A spare drawer storage device according to claim 4, characterized in that, The accommodating position (14) is also provided with a limiting stop (152) located at the sliding end of the low-pressure drawer unit (2), and the limiting stop (152) abuts against the rear end of the low-pressure drawer unit (2).

7. A spare drawer storage device according to claim 4, characterized in that, The accommodating positions (14) at different heights within the cabinet (1) have different vertical heights to accommodate low-pressure drawer units (2) of different height specifications.

8. A spare drawer storage device according to claim 1, characterized in that, The inner wall of the cabinet (1) is provided with a horizontal support mesh plate (13). The support mesh plate (13) divides the sealed cavity (12) into an upper compartment (121) and a lower compartment (122). The lower compartment (122) is provided with several accommodating positions (14).

9. A spare drawer storage device according to claim 1, characterized in that, The gas purification component (6) also includes a second purifier (62), the air inlet of which is provided with a fan (66) for driving gas circulation, and the air outlet of the second purifier (62) is connected to the inside of the cabinet (1).

10. A spare drawer storage device according to claim 1, characterized in that, It also includes a limit switch (8) and a time relay (9). The limit switch (8) is fixed to the inner wall of the cabinet (1) and is triggered when the cabinet door (11) is closed. The limit switch (8), the time relay (9) and the air pump (33) are electrically connected.

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