A high-low voltage switch cabinet configured with an air internal circulation system

Abstract

The utility model relates to the technical field of switch cabinet discloses a high low pressure switch cabinet of configuration air internal circulation system, including cabinet body and air internal circulation system. The utility model discloses a switch cabinet configuration air internal circulation system, through this air internal circulation system can be carried out such as refrigeration, oxygen removal and water removal treatment to the air in the inner chamber of switch cabinet's cabinet body, and can send back the low temperature, low oxygen and dry air obtained after processing to the inner chamber of cabinet body, to realize the circulation of the air in the inner chamber, thereby being favorable to the inner chamber of cabinet body can be maintained in the low temperature, low oxygen and dry state for a long time. Meanwhile, based on the process of circulating treatment to the air in the inner chamber of cabinet, the inner chamber basically has no heat exchange process with the air in the outside environment, which is favorable to maintaining the inner chamber in a low-dust state for a long time.

Description

Technical Field

[0001] This utility model relates to the field of switchgear technology, and more specifically, to a high and low voltage switchgear equipped with an internal air circulation system. Background Technology

[0002] The content in this section only provides background information related to this utility model and may not constitute prior art.

[0003] Switchgear, as an important electrical device in a power system, primarily functions to receive and distribute electrical energy while simultaneously closing and opening power lines. Switchgear is frequently used to transmit and exchange electrical loads. In the event of a fault, switchgear allows for the timely and effective disconnection of faulty equipment and lines within the power system, thereby ensuring the safe and stable operation of the power system and production equipment.

[0004] Currently, switchgear typically operates for extended periods. Due to the numerous internal components, enclosed environment, and poor heat dissipation, temperature rise issues within the switchgear are becoming increasingly serious. Generally, one of the most important indicators of stable switchgear operation is the normal temperature of the contacts and busbars. However, after prolonged operation, oxidation or loosening may occur at some connection points, leading to localized heat buildup. Furthermore, in environments lacking ventilation and with harsh conditions, significant amounts of dust and moisture may enter the cabinet, further exacerbating heat generation and oxidation of components. If these problems are not detected and addressed promptly, they can lead to excessively high contact and busbar temperatures, potentially causing equipment burnout and compromising the safe operation of the switchgear.

[0005] Although switchgear capable of heat dissipation and moisture prevention has emerged at present (such as a novel high and low voltage switchgear disclosed in patent document CN2023211021595), the heat dissipation of such switchgear is generally achieved by heat dissipation components such as fans to exchange heat between the air inside the switchgear and the air in the external environment. In this way, the atmosphere inside the switchgear is easily affected by the external environment and cannot maintain a stable low dust, low oxygen and dry state for a long time. Moreover, the heat dissipation effect achieved by heat dissipation devices such as fans alone is limited. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a high and low voltage switchgear equipped with an internal air circulation system, so that the interior of the switchgear can be maintained in a low temperature, low oxygen, low dust and dry state for a long time, which is conducive to the long-term stable and reliable operation of the switchgear.

[0007] The objective of this utility model is achieved through the following technical solution:

[0008] This utility model discloses a high- and low-voltage switchgear equipped with an air recirculation system, comprising:

[0009] The cabinet defines an inner cavity and an air outlet and an air inlet communicating with the inner cavity;

[0010] An air recirculation system, the air recirculation system comprising:

[0011] A circulation pipeline is connected between the air outlet and the air inlet;

[0012] A circulation guide assembly is used to guide the air in the inner cavity into the circulation pipeline through the air outlet, and to allow the air entering the circulation pipeline to return to the inner cavity through the air inlet;

[0013] Refrigeration components;

[0014] A purification and treatment component; the refrigeration component and the purification and treatment component are arranged sequentially along the flow direction of the air flowing in the circulation pipeline;

[0015] The refrigeration component is used to refrigerate the air flowing through the circulation pipeline, and the purification component is used to deoxygenate and remove water from the air flowing through the circulation pipeline and refrigerated by the refrigeration component.

[0016] Furthermore, the purification process assembly includes a cavity;

[0017] The cavity defines a purification chamber having an inlet and an outlet; wherein air flowing in the circulation duct and cooled by the refrigeration assembly is configured to enter the purification chamber through the inlet and exit from the outlet; and air exiting from the outlet can continue to reach the air inlet under the guidance of the circulation duct and return to the inner cavity.

[0018] The purification chamber is provided with an oxygen removal layer and a drying layer, which are arranged sequentially along the airflow direction within the purification chamber.

[0019] Furthermore, the deoxidizing layer includes iron powder deoxidizer, and the drying layer includes activated alumina desiccant.

[0020] Furthermore, the cavity is provided with two partitions, which divide the purification cavity from bottom to top into a transition chamber, a deoxygenation chamber, and a drying chamber; each partition has a channel for connecting adjacent chambers.

[0021] The inlet is connected to the transition chamber, and the outlet is connected to the drying chamber;

[0022] The deoxygenation layer is disposed within the deoxygenation chamber, and the drying layer is disposed within the drying chamber.

[0023] Furthermore, the circulation pipeline includes a first pipe section, a second pipe section, a third pipe section, and a fourth pipe section; the two ends of the first pipe section are respectively connected to the air outlet and the air inlet, one end of the second pipe section is connected to the exhaust outlet, the other end of the second pipe section is connected to one end of the third pipe section, the other end of the third pipe section is connected to one end of the fourth pipe section, and the other end of the fourth pipe section is connected to the air inlet;

[0024] The refrigeration component is used to cool the air flowing through the first pipe section.

[0025] Furthermore, the refrigeration assembly includes an evaporator for cooling the air flowing through the circulation pipe;

[0026] The high and low voltage switchgear also includes a collection box, which defines an upward-opening collection chamber. The opening of the collection chamber is located below the evaporator and aligned with the evaporator.

[0027] Furthermore, the air outlet and the air inlet are arranged sequentially from bottom to top along the height direction of the inner cavity.

[0028] Furthermore, the high and low voltage switchgear also includes a housing, which defines a protective cavity;

[0029] Both the refrigeration component and the purification component are disposed within the protective cavity.

[0030] Furthermore, a heat dissipation and airflow guiding component is provided on one side of the protective cavity, which is used to guide air from the external environment into the protective cavity;

[0031] A heat dissipation vent is provided on the opposite side of the protective cavity.

[0032] Furthermore, a closable maintenance door is provided on one side of the protective cavity.

[0033] The technical solution of this utility model embodiment has at least the following advantages and beneficial effects:

[0034] The high and low voltage switchgear disclosed in this utility model is equipped with an internal air circulation system. This system can treat the air inside the switchgear cabinet by means of cooling, deoxygenation, and dehydration, and can send the treated low-temperature, low-oxygen, and dry air back into the cabinet cavity to achieve air circulation within the cavity. This helps to maintain the cabinet cavity in a low-temperature, low-oxygen, and dry state for a long time, which is conducive to the long-term stable operation of the switchgear.

[0035] Meanwhile, since there is basically no heat exchange between the inner cavity and the outside environment during the air circulation process, it can effectively prevent dust and other foreign objects from entering the inner cavity, thus allowing the inner cavity to maintain a low dust level for a long time. Attached Figure Description

[0036] Figure 1 A schematic diagram of the structure of a high- and low-voltage switchgear with an internal air circulation system provided for an embodiment of this utility model;

[0037] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the high and low voltage switchgear.

[0038] Figure 3 for Figure 2 Enlarged view of the local structure at point A;

[0039] Figure 4 A cross-sectional view of the purification treatment component provided in an embodiment of this utility model;

[0040] Figure 5 This is a cross-sectional view of the housing provided for an embodiment of the present invention, showing the general structure of the refrigeration component and the purification component installed inside the housing.

[0041] Figure 6 A schematic diagram of the structure of the refrigeration component, the purification component, and the collection box provided in the embodiments of this utility model.

[0042] Icons: 10-Cabinet, 11-Inner cavity, 12-Air outlet, 13-Air inlet, 20-Air recirculation system, 21-Circulation pipeline, 211-First pipe section, 212-Second pipe section, 213-Third pipe section, 214-Fourth pipe section, 215-Connector, 22-Circulation guide assembly, 221-First fan, 222-First dust filter, 23-Refrigeration assembly, 231-Evaporator, 232-Compressor, 233-Condenser, 234-Expansion valve, 24-Purification treatment Components: 241-Cavity, 242-Purification Chamber, 2421-Transition Chamber, 2422-Deoxygenation Chamber, 2423-Drying Chamber, 243-Inlet, 244-Outlet, 245-Deoxygenation Layer, 246-Drying Layer, 247-Partition, 30-Shell, 31-Protective Chamber, 32-Maintenance Door, 33-Heat Dissipation and Airflow Guiding Components, 331-Second Fan, 332-Second Dustproof Net, 34-Heat Dissipation Port, 35-Third Dustproof Net, 40-Collection Box, 41-Collection Chamber. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments. The same reference numerals in the accompanying drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0044] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of protection of this utility model may have fewer components, have other components not shown in the drawings, different components, components arranged differently, or components with different connections, etc. Furthermore, two or more components shown in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0045] This utility model discloses a high- and low-voltage switchgear (hereinafter referred to as "switchgear" for ease of explanation) equipped with an air recirculation system 20. Figure 1 and Figure 2 The diagram shows a schematic structural diagram and a cross-sectional view of an exemplary switch cabinet disclosed in this embodiment of the present invention. Generally, the switch cabinet may include a cabinet body 10 and an internal air circulation system 20.

[0046] In an embodiment of this utility model, the cabinet 10 is the main body of the switch cabinet. Referring to... Figure 1 or Figure 2As shown, the cabinet 10 defines an inner cavity 11, which provides installation space for the relevant electrical components constituting the switch cabinet. Under normal operation of the switch cabinet, the inner cavity 11 should be a relatively sealed chamber.

[0047] Meanwhile, the cabinet 10 also defines an air outlet 12 and an air inlet 13 that communicate with the inner cavity 11. The air outlet 12 is used to allow air from inside the inner cavity 11 to flow out of the inner cavity 11, while the air inlet 13 is used to replenish the inner cavity 11 with air, especially the air processed by the air recirculation system 20, which will be described in detail below.

[0048] In an embodiment of this utility model, the air internal circulation system 20 is used to allow the air in the inner cavity 11 to flow out through the air outlet 12, and to treat the outflowing air by means of cooling, deoxygenation, dehydration, etc., to form low temperature, low oxygen and dry air, and finally the low temperature, low oxygen and dry air is transported to the inner cavity 11 of the cabinet 10 through the air inlet 13.

[0049] Specifically, in combination Figure 2 As shown, the air recirculation system 20 may include a recirculation pipe 21, a recirculation guide assembly 22, a cooling assembly 23, and a purification assembly 24. The recirculation pipe 21 is connected between the air outlet 12 and the air inlet 13, so that the inner cavity 11, the air outlet 12, the recirculation pipe 21, and the air inlet 13 together form a recirculation path for air flow.

[0050] The circulation guide assembly 22 is used to guide the air in the inner cavity 11 into the circulation pipe 21 through the air outlet 12, and to allow the air entering the circulation pipe 21 to return to the inner cavity 11 through the air inlet 13. In other words, by setting up the circulation guide assembly 22, the air in the inner cavity 11 can flow sequentially through the air outlet 12, the circulation pipe 21, and the air inlet 13 before returning to the inner cavity 11, thus allowing the air in the inner cavity 11 to continuously circulate within the circulation path formed by the inner cavity 11, the air outlet 12, the circulation pipe 21, and the air inlet 13. The flow direction of the air circulating within the inner cavity 11 can be referred to... Figure 2 As indicated by the dashed arrow.

[0051] Among them, reference Figure 3As shown, the circulation guide assembly 22 may include a first fan 221, which may be disposed within the air outlet 12. Simultaneously, the circulation guide assembly 22 may also include a first dust filter 222, which may be disposed at the air outlet 12 and located upstream of and covering the first fan 221. That is, under the action of the first fan 221, the air in the inner cavity 11 must first pass through the first dust filter 222 before flowing through the first fan 221 and entering the circulation pipe 21. Through the installation of the first dust filter 222, dust and other foreign matter contained in the air within the inner cavity 11 can be removed as much as possible, thereby achieving preliminary purification of the air within the inner cavity 11. The first dust filter 222 may be detachably disposed on the inner wall of the inner cavity 11 to cover the air outlet 12, so that the first dust filter 222 can be removed as needed for centralized treatment of dust and other foreign matter accumulated on it.

[0052] Combination Figure 2 As shown, the cooling component 23 and the purification component 24 are arranged sequentially along the airflow direction in the circulation pipe 21. In other words, the air entering the circulation pipe 21 through the air outlet 12 will pass through the cooling component 23 and the purification component 24 in sequence before returning to the inner cavity 11 from the air inlet 13.

[0053] The refrigeration component 23 is used to cool the air flowing through the circulation pipe 21. The refrigeration of the refrigeration component 23 can reduce the temperature of the air from the inner cavity 11.

[0054] Specifically, in combination Figure 3 , Figure 5 and Figure 6As shown, the refrigeration assembly 23 may include an evaporator 231, a compressor 232, a condenser 233, and an expansion valve 234. The evaporator 231 is used to cool the air flowing through the circulation pipe 21. Specifically, the evaporator 231 provides cryogenic liquid refrigerant and allows it to exchange heat with the air flowing through the circulation pipe 21. During this process, the cryogenic liquid refrigerant in the evaporator 231 absorbs the heat carried by the air flowing through the circulation pipe 21 and converts it into gaseous refrigerant. The air flowing through the circulation pipe 21 becomes cryogenic due to the absorption of heat. The compressor 232 receives the gaseous refrigerant from the evaporator 231 and delivers it to the condenser 233. The condenser 233 receives the gaseous refrigerant from the compressor 232 and converts it back into cryogenic liquid refrigerant. The expansion valve 234 receives the cryogenic liquid refrigerant from the condenser 233, reduces its pressure, and delivers it to the evaporator 231, thus realizing the recycling of the refrigerant and enabling the evaporator 231 to continuously and reliably cool the air flowing through the circulation pipe 21.

[0055] It should be noted that the refrigeration system consisting of evaporator 231, compressor 232, condenser 233 and expansion valve 234 is a mature refrigeration technology known in the prior art. Furthermore, the components such as evaporator 231, compressor 232, condenser 233 and expansion valve 234 can be directly adopted from products known in the prior art. Since this utility model does not improve the structure of these components, it will not be described in detail here.

[0056] In an embodiment of this utility model, the purification treatment component 24 is used to perform treatments such as deoxygenation and dehydration on the air that flows through the circulation pipeline 21 and is cooled by the cooling component 23.

[0057] Specifically, in combination Figure 3 and Figure 4 As shown, the purification assembly 24 may include a cavity 241. The cavity 241 defines a purification chamber 242 having an inlet 243 and an outlet 244. Air flowing within the circulation duct 21 and cooled by the cooling assembly 23 is configured to enter the purification chamber 242 through the inlet 243 and exit through the outlet 244. Air exiting the outlet 244 can then continue to be guided by the circulation duct 21 to the air inlet 13 and return to the inner cavity 11 of the cabinet 10.

[0058] The purification chamber 242 may be equipped with an oxygen removal layer 245 and a drying layer 246, which are arranged sequentially along the airflow direction within the purification chamber 242. In other words, air entering the purification chamber 242 through the inlet 243 will sequentially pass through the oxygen removal layer 245 and the drying layer 246 before exiting from the outlet 244. The oxygen removal layer 245 is used to remove as much oxygen as possible from the air, and the drying layer 246 is used to remove as much moisture as possible from the air.

[0059] In this way, the air that finally flows out of the outlet 244 and re-enters the inner cavity 11 is low-temperature, low-oxygen, and dry air. Simultaneously, during the operation of the switchgear, the air inside the inner cavity 11 is circulated, cooled, deoxygenated, and dehydrated by the air circulation system 20. Therefore, the inner cavity 11 maintains a low-temperature, low-oxygen, and dry state for a long time. This improves the heat dissipation effect of the inner cavity 11, effectively prevents the electrical components from being affected by external moisture, and alleviates the oxidation problem at localized high-temperature nodes of the cabinet 10. Furthermore, since there is virtually no heat exchange between the inner cavity 11 and the external environment during the air circulation process, it effectively prevents dust and other foreign objects from entering the inner cavity 11, thus maintaining a low-dust environment for a long time.

[0060] The aforementioned deoxidizing layer 245 may include iron powder deoxidizer, and the drying layer 246 may include spherical activated alumina desiccant. It is worth noting that, to facilitate the placement of the iron powder deoxidizer and the activated alumina desiccant, the cavity 241 can be further constructed in the manner described below.

[0061] like Figure 4 As shown, the cavity 241 is provided with two partitions 247, which divide the purification cavity 242 from bottom to top into a transition chamber 2421, a deoxygenation chamber 2422, and a drying chamber 2423. Each partition 247 has a channel for connecting adjacent chambers; for example, each partition 247 can be a perforated mesh plate.

[0062] At this time, the aforementioned inlet 243 can communicate with the transition chamber 2421, and the outlet 244 can communicate with the drying chamber 2423. For example, the inlet 243 can be located on the side of the transition chamber 2421, and the outlet 244 can be located at the top of the drying chamber 2423. The iron powder deoxidizer constituting the deoxidation layer 245 can be placed in the deoxidation chamber 2422, and the activated alumina desiccant constituting the drying layer 246 can be placed in the drying chamber 2423. For example, the iron powder deoxidizer can be supported on the partition 247 corresponding to the deoxidation chamber 2422, and the activated alumina desiccant can be supported on the partition 247 corresponding to the drying chamber 2423.

[0063] Thus, in conjunction with the foregoing, when the air cooled by the evaporator 231 of the refrigeration component 23 reaches the purification component 24, the air first enters the transition chamber 2421 through the inlet 243. The air entering the transition chamber 2421 then flows sequentially from bottom to top through the deoxygenation chamber 2422 and the drying chamber 2423. During this process, the iron powder deoxidizer in the deoxygenation chamber 2422 removes as much oxygen as possible from the air, and the activated alumina desiccant in the drying chamber 2423 removes as much moisture as possible from the air. Afterward, the deoxygenated and dried air flows out from the outlet 244 and, guided by the circulation pipe 21, returns to the inner cavity 11 through the inlet 13.

[0064] In the embodiments of this utility model, reference is made to Figure 1 or Figure 2 As shown, the air outlet 12 and air inlet 13 used for air circulation can be arranged sequentially from bottom to top along the height direction of the inner cavity 11. That is, the air outlet 12 is located below the air inlet 13. For example, the air outlet 12 can be located near the bottom of the inner cavity 11, and the air inlet 13 can be located near the top of the inner cavity 11. This arrangement not only ensures that the air in all areas of the inner cavity 11 can be cooled, deoxygenated, and dehydrated by the air circulation system 20 as much as possible, but also allows the low-temperature air, after being cooled by the air circulation system 20, to return to the inner cavity 11 through the air inlet 13. The low-temperature air can naturally sink and flow from the top to the bottom of the inner cavity 11, thereby further improving the heat dissipation effect on the inner cavity 11.

[0065] In embodiments of this utility model, in order to ensure reliable air circulation within the inner cavity 11, combined with Figure 2 As shown, the circulation pipeline 21 may further include a first pipe section 211, a second pipe section 212, a third pipe section 213, and a fourth pipe section 214. The two ends of the first pipe section 211 are connected to the air outlet 12 and the air inlet 243, respectively, so that air from the inner cavity 11 is guided through the first pipe section 211 to the purification treatment component 24 for deoxygenation and dehydration treatment via the air outlet 12. At this time, the evaporator 231 is used to cool the air flowing through the first pipe section 211.

[0066] One end of the second pipe section 212 is connected to the outlet 244, and the other end of the second pipe section 212 is connected to one end of the third pipe section 213. The other end of the third pipe section 213 is connected to one end of the fourth pipe section 214, and the other end of the fourth pipe section 214 is connected to the air inlet 13. In this way, when the air that has undergone refrigeration, deoxygenation, and dehydration treatment flows out through the outlet 244, it can flow sequentially through the second pipe section 212, the third pipe section 213, the fourth pipe section 214, and the air inlet 13 and return to the inner cavity 11.

[0067] The third pipe section 213 can be a steel wire flexible hose. Furthermore, the connection between the second pipe section 212 and the third pipe section 213, and the connection between the third pipe section 213 and the fourth pipe section 214, can be made using a connector 215. (Refer to...) Figure 3 and Figure 6 As shown, the connector 215 can be a component composed of conventional pipe connection parts such as a chuck and clamps, making the third pipe section 213 easily replaceable. The chuck can be a flange located at the end of the corresponding pipe section. Furthermore, after the flanges at the ends of the two pipe sections are joined, a polytetrafluoroethylene (PTFE) gasket can be placed between the flanges, and when the clamps are tightened on the flanges at the ends of the two pipe sections, the inner ring of the clamps has a sealing ring, thereby improving the sealing effect.

[0068] In the embodiments of this utility model, combined with Figure 1 or Figure 2 As shown, the switch cabinet may also include a housing 30. The housing 30 may be disposed beside and adjacent to the cabinet 10, and the interior of the housing 30 defines, as follows: Figure 3 or Figure 5 The protective cavity 31 is shown. The relevant components of the aforementioned refrigeration assembly 23 and the relevant components of the purification assembly 24 can all be disposed in the protective cavity 31, thereby providing protection for the refrigeration assembly 23 and the purification assembly 24 through the protective cavity 31.

[0069] At this point, the end of the second pipe section 212 that is away from the outlet 244 can pass through the top of the protective cavity 31 and connect with one end of the third pipe section 213. This allows the third pipe section 213 to be exposed outside the protective cavity 31, thereby facilitating the maintenance of the third pipe section 213.

[0070] At the same time, refer to Figure 3 or Figure 5 As shown, an openable and closable maintenance door 32 can also be provided on one side of the protective cavity 31. For example, the maintenance door 32 can be provided on the side of the housing 30 away from the cabinet 10. The provision of the maintenance door 32 facilitates the maintenance and repair of relevant components inside the protective cavity 31 as needed.

[0071] Furthermore, considering that the components housed within the protective cavity 31 also generate heat during normal operation, especially the condenser 233 that constitutes the cooling assembly 23, it is necessary to dissipate heat from the protective cavity 31.

[0072] Therefore, in combination Figure 5As shown, a heat dissipation and airflow guiding assembly 33 can be provided on one side of the protective cavity 31. This assembly guides air from the external environment into the protective cavity 31. For example, the heat dissipation and airflow guiding assembly 33 may include a second fan 331 disposed on the rear side wall of the protective cavity 31. The second fan 331 of the heat dissipation and airflow guiding assembly 33 can be aligned with the condenser 233 inside the protective cavity 31, so that the air guided into the protective cavity 31 by the second fan 331 can be used to directly dissipate heat from the condenser 233. The heat dissipation and airflow guiding assembly 33 may also include a second dustproof mesh 332 disposed on the outer wall of the housing 30 and covering the second fan 331, to minimize the entry of dust and other foreign objects from the external environment into the protective cavity 31.

[0073] At this point, a heat dissipation vent 34 is provided on the opposite side of the protective cavity 31. For example, the heat dissipation vent 34 can be located on the front side wall of the protective cavity 31. In this way, the second fan 331 of the heat dissipation and airflow guiding assembly 33 can guide air from the external environment into the protective cavity 31 to dissipate heat from related components such as the condenser 233, and the air entering the protective cavity 31 will eventually flow out from the heat dissipation vent 34. A third dust filter 35 can be provided at the heat dissipation vent 34 to minimize the entry of dust and other foreign objects from the external environment into the protective cavity 31.

[0074] In embodiments of this invention, considering that a small amount of condensate may be generated on the outer wall of the evaporator 231 when the air flowing through the circulation pipe 21 is cooled using the evaporator 231, the switch cabinet may further include a collection box 40.

[0075] Combination Figure 3 and Figure 6 As shown, the collection box 40 defines an upward-opening collection chamber 41, with the opening of the collection chamber 41 located below and aligned with the evaporator 231. Thus, condensate generated on the outer wall of the evaporator 231 during operation can flow downwards along the outer wall of the evaporator 231 into the collection chamber 41 of the collection box 40, facilitating subsequent centralized treatment of the collected condensate.

[0076] Furthermore, refer to Figure 1 or Figure 6 As shown, when the housing 30 is provided, the collection box 40 can be installed in a push-pull form at the bottom of the protective cavity 31, so that the collection box 40 can be pulled out of the protective cavity 31 as needed to treat the collected condensate. The push-pull collection box 40 is similar to a push-pull drawer in the prior art.

[0077] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high- and low-voltage switchgear equipped with an internal air circulation system, characterized in that, include: The cabinet defines an inner cavity and an air outlet and an air inlet communicating with the inner cavity; An air recirculation system, the air recirculation system comprising: A circulation pipeline is connected between the air outlet and the air inlet; A circulation guide assembly is used to guide the air in the inner cavity into the circulation pipeline through the air outlet, and to allow the air entering the circulation pipeline to return to the inner cavity through the air inlet; Refrigeration components; A purification and treatment component; the refrigeration component and the purification and treatment component are arranged sequentially along the flow direction of the air flowing in the circulation pipeline; The refrigeration component is used to refrigerate the air flowing through the circulation pipeline, and the purification component is used to deoxygenate and remove water from the air flowing through the circulation pipeline and refrigerated by the refrigeration component.

2. The high and low voltage switchgear with an internal air circulation system according to claim 1, characterized in that, The purification process component includes a cavity; The cavity defines a purification chamber having an inlet and an outlet; wherein air flowing in the circulation duct and cooled by the refrigeration assembly is configured to enter the purification chamber through the inlet and exit from the outlet; and air exiting from the outlet can continue to reach the air inlet under the guidance of the circulation duct and return to the inner cavity. The purification chamber is provided with an oxygen removal layer and a drying layer, which are arranged sequentially along the airflow direction within the purification chamber.

3. The high and low voltage switchgear with an internal air circulation system according to claim 2, characterized in that, The deoxidizing layer includes iron powder deoxidizer, and the drying layer includes activated alumina desiccant.

4. The high and low voltage switchgear with an internal air circulation system according to claim 2, characterized in that, The cavity is equipped with two partitions, which divide the purification cavity from bottom to top into a transition chamber, a deoxygenation chamber, and a drying chamber; each partition has a channel for connecting adjacent chambers. The inlet is connected to the transition chamber, and the outlet is connected to the drying chamber; The deoxygenation layer is disposed within the deoxygenation chamber, and the drying layer is disposed within the drying chamber.

5. The high and low voltage switchgear with an internal air circulation system according to claim 2, characterized in that, The circulation pipeline includes a first pipe section, a second pipe section, a third pipe section, and a fourth pipe section; the two ends of the first pipe section are respectively connected to the air outlet and the air inlet; one end of the second pipe section is connected to the exhaust outlet; the other end of the second pipe section is connected to one end of the third pipe section; the other end of the third pipe section is connected to one end of the fourth pipe section; and the other end of the fourth pipe section is connected to the air inlet. The refrigeration component is used to cool the air flowing through the first pipe section.

6. The high and low voltage switchgear with an internal air circulation system according to claim 1, characterized in that, The refrigeration assembly includes an evaporator for cooling the air flowing through the circulation pipe; It also includes a collection box that defines an upwardly opening collection chamber, the opening of which is located below and aligned with the evaporator.

7. The high and low voltage switchgear with an internal air circulation system according to claim 1, characterized in that, The air outlet and the air inlet are arranged sequentially from bottom to top along the height direction of the inner cavity.

8. The high and low voltage switchgear with an internal air circulation system according to claim 1, characterized in that, It also includes a housing that defines a protective cavity; Both the refrigeration component and the purification component are disposed within the protective cavity.

9. The high and low voltage switchgear with an internal air circulation system according to claim 8, characterized in that, A heat dissipation and airflow guiding component is provided on one side of the protective cavity, which is used to guide air from the external environment into the protective cavity; A heat dissipation vent is provided on the opposite side of the protective cavity.

10. The high and low voltage switchgear with an internal air circulation system according to claim 8, characterized in that, A maintenance door that can be opened and closed is provided on one side of the protective cavity.

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