A low voltage switch cabinet

Abstract

The present invention relates to the technical field of switch cabinets, and specifically discloses a low-voltage switch cabinet, including a cabinet, an airflow regulating device having a channel of a venturi structure formed inside, the airflow regulating device having an inlet and an outlet connected through the channel from top to bottom, one end of the inlet of the airflow regulating device being connected to the cabinet at the top of the cabinet, and the outlet of the airflow regulating device being connected to an exhaust fan; one end of an exhaust pipe is connected to the airflow regulating device and connected to the throat of the channel, an exhaust hood is provided at one end of the exhaust pipe away from the airflow regulating device, the exhaust hood is arranged inside the cabinet, and the exhaust hood is arranged around electrical components that need to increase heat dissipation; the exhaust pipe is subjected to the negative pressure generated by the airflow of the channel, and the airflow volume around the electrical components is increased at the position of the exhaust hood. The present invention can make the heat dissipation of electrical components with high heat generation inside the cabinet smooth, and reduce the temperature rise.

Description

Technical Field

[0001] The invention relates to the technical field of switch cabinets, and in particular to a low-voltage switch cabinet. Background Art

[0002] Switchgear equipment is an important electrical equipment for connecting and disconnecting circuits, removing or isolating faults. It is usually used in substations, power stations and other power supply and distribution systems. Circuit breakers, disconnectors, load switches, grounding switches and other electrical components are installed in the switchgear. During operation, the internal electrical components of the switchgear will emit a large amount of heat. Therefore, the interior of the switchgear usually needs to be cooled. The switchgear may be affected by different installation environments, such as basements or adverse conditions such as humidity or dust, resulting in poor heat dissipation of the switchgear, while affecting the safe operation of the switchgear.

[0003] The Chinese patent document with the authorization announcement number CN117902110B discloses a low-voltage switch cabinet with ventilation and cooling functions, including a cabinet, a vertical plate, a bottom plate and a top plate. Two sets of vertical plates are vertically and symmetrically arranged at two sides of the cabinet. The bottom plate and the top plate are horizontally arranged between the two sets of vertical plates. The bottom plate is located below the top plate. Two sets of inclined plates are respectively arranged between the two sets of vertical plates and the inner walls of the two sides of the cabinet. The end of the inclined plate close to the central axis of the cabinet is higher than the end away from the central axis of the cabinet. The top plate and the bottom plate can be used to adjust the cabinet. The cavity formed by the middle part of the cabinet and the two groups of vertical plates is divided into a top cavity, an installation cavity and a bottom cavity from top to bottom. Two symmetrical groups of connecting cavities are formed between the two sides of the top of the cabinet, the two groups of vertical plates and the two groups of inclined plates. A number of through holes are provided on the vertical plates, and the connecting cavity is connected with the top cavity through the through holes. When in use, since the installation cavity, the top cavity and the connecting cavity are connected, the external airflow will take away the heat rising from the installation cavity to the top when flowing through the connecting cavity and the top cavity, thereby realizing ventilation and heat dissipation of the switch cabinet.

[0004] However, the heat emitted by the electrical components inside the low-voltage switch cabinet during operation will vary depending on the working state of the electrical components. Some electrical components inside the cabinet generate a large amount of heat during operation. When heat is dissipated through the fixed airflow formed by the installation cavity, the top cavity and the connecting cavity, some electrical components will have their temperatures raised due to poor heat dissipation, thereby reducing the efficiency of power distribution and shortening their service life. Summary of the invention

[0005] The present invention provides a low-voltage switch cabinet, aiming to solve the problem of temperature rise caused by poor heat dissipation of electrical components with high heat generation inside the cabinet in the related art.

[0006] A low-voltage switch cabinet of the present invention comprises a cabinet body, and also comprises: an airflow regulating device, a channel of a venturi structure is formed inside the airflow regulating device, the airflow regulating device has an inlet and an outlet connected up and down through the channel, one end of the inlet of the airflow regulating device is connected with the cabinet body at the top of the cabinet body, and the outlet of the airflow regulating device is connected with an exhaust fan; an exhaust pipe, one end of the exhaust pipe is connected to the airflow regulating device and is connected with the throat position of the channel, an exhaust hood is arranged at one end of the exhaust pipe away from the airflow regulating device, the exhaust hood is arranged inside the cabinet body, and the exhaust hood is arranged around electrical components that need to increase heat dissipation; an air inlet is opened at the bottom of the cabinet body and is spaced from the ground, the gas entering from the bottom of the cabinet body flows from bottom to top inside the cabinet body, and flows out of the cabinet body through the channel in the airflow regulating device, and at the same time, the exhaust pipe is subjected to the negative pressure generated by the airflow in the channel to increase the airflow volume around the electrical components at the position of the exhaust hood.

[0007] The effect is that the inlet and outlet of the air flow regulating device are connected by the channel up and down, so that the interior of the cabinet is connected by the inlet. When the gas enters the bottom of the cabinet, the air flow inside the cabinet can be made to flow from the bottom to the top through the exhaust fan, so that the electrical components inside the cabinet are cooled. At the same time, the electrical components with high heat generation need to be dissipated through the suction hood. Since the structure of the channel is a Venturi structure, the exhaust pipe connected to the throat of the channel will form a negative pressure, so that the exhaust pipe will be exhausted. The exhaust will change the direction of the airflow around the exhaust hood, thereby increasing the amount of air passing around the electrical components that need to increase the heat dissipation, so that the electrical components with high heat generation can dissipate heat more smoothly, which is used to control the temperature of the electrical components. At the same time, since some electrical components with high heat generation can be dissipated in a targeted manner, the load increased by adopting the overall heat dissipation method can be reduced, saving energy consumption.

[0008] Preferably, the airflow regulating device includes a shell and a core body arranged inside the shell, the inlet and the outlet are located on the shell, the channel is located inside the core body and the two ends of the channel are respectively used to connect the inlet and the outlet, an air hole is opened in the middle position of the channel, and the exhaust pipe is connected to the channel through the air hole.

[0009] Preferably, an installation cavity is opened in the horizontal direction of the shell, and a core body is slidably connected in the installation cavity. At least two core bodies are arranged along the axial direction of the installation cavity, and the diameters of the middle throats of the channels in the multiple core bodies are set in various ways. The core body is connected to a driving device for driving the core body to move along the axial direction of the installation cavity.

[0010] The effect is that an installation cavity is opened in the horizontal direction of the shell, so that multiple cores can be slidably connected in the installation cavity. When the core slides along the length direction of the installation cavity, different cores can cooperate with the inside of the shell, so that throats of different diameters produce different suction forces on the exhaust pipe, thereby adjusting the heat dissipation efficiency of the electrical components and further controlling the temperature rise of the electrical components.

[0011] Preferably, the driving device includes a fixed magnetic ring, a moving magnet and a spring. A protective cover is provided on the outside of the driving device, the protective cover is fixed on the shell, the fixed magnetic ring is fixed inside the protective cover, the moving magnet is fixed on the core body, the length direction of the spring is arranged parallel to the axis of the installation cavity, one end of the spring abuts against the core body, and the other end abuts against the protective cover.

[0012] The effect is that the suction force generated by the fixed magnetic ring and the moving magnet can drive the core to move along the axial direction of the installation cavity, and the spring stores elastic potential energy in the process of the fixed magnetic ring moving the core so as to restore the position of the core.

[0013] Preferably, the driving device includes a power piece, a screw and a moving block. The power piece adopts a servo motor or a stepper motor. The screw is coaxially fixed on the output shaft of the power piece. The screw is offset from the axis of the mounting cavity. The moving block is fixed at the end of the core body. The screw passes through the moving block and is threadedly connected to the moving block.

[0014] The effect is that the power piece adopts a servo motor or a stepper motor, so that the screw drives the moving block to move, so that the moving block can move the core body, and the power piece can accurately move the core body to the required position, thereby improving the accuracy of control.

[0015] Preferably, the bottom of the cabinet is rectangular and has two air inlets along the width direction of the cabinet, and an air guide assembly is provided at each air inlet; the air guide assembly includes a plurality of air guide plates, and the plurality of air guide plates are arranged along the width direction of the cabinet, and the lower parts of the air guide plates are all located in the air inlets, and the upper sides of the air guide plates are inclined from the middle of the air inlets to both sides in the width direction of the cabinet.

[0016] The effect is that the two air inlets are arranged along the width direction of the cabinet, so that the air guide components arranged at the two air inlets can evenly distribute the airflow entering the cabinet from the air inlets, and through the inclined setting of the air guide body, the air guide plate increases the distribution surface of the airflow along the width direction of the cabinet, which is used for heat dissipation of most electrical components of the cabinet.

[0017] Preferably, a flow channel is opened inside the air guide plate, and an air inlet pipe and an air outlet pipe are respectively provided at both ends of the air guide plate, the air inlet pipe and the air outlet pipe are connected with the flow channels inside the multiple air guide plates, and the air inlet pipe and the air outlet pipe are used to connect the cold air pipe of the air conditioner; an arc-shaped plate is provided on the upper edge of the air guide plate, one end of the arc-shaped plate is fixed on the surface of the air guide plate for guiding air, and the other end is away from the air guide plate connected to the arc-shaped plate, and the arc-shaped middle part of the arc-shaped plate is arched upward.

[0018] The effect is: the air inlet pipe and the air outlet pipe are connected to the air guide plate, so that the flow channel inside the air guide plate flows through the air inlet pipe and the air outlet pipe, so that the air guide plate is cooled down. When there is air flow passing through the air guide plate, the water vapor in the air flow will condense on the air guide plate. When the humidity in the environment is high, the air guide plate can reduce the humidity of the gas entering the cabinet to reduce damage to the electrical components inside the cabinet.

[0019] Preferably, a fan is arranged below the air guide assembly, and driving wheels are coaxially fixed on both fans. A driving motor is fixed at the bottom of the cabinet, and a driving wheel is coaxially fixed on the output shaft of the driving motor. The driving wheel is connected to the two driving wheels through a transmission belt.

[0020] The driving motor drives the two fans to rotate through the driving wheel and the transmission belt, so that the driving motor can avoid the position of the air inlet, so that the condensed water formed on the air guide plate at the air inlet will not cause corrosion to the driving motor.

[0021] Preferably, a branch pipe is provided between the exhaust pipe and the suction hood, and at least two branch pipes are provided, one branch pipe is connected to an suction hood, and a valve for controlling the connection of the branch pipes is connected to the branch pipe.

[0022] The effect is that a branch pipe is arranged between the exhaust pipe and the suction hood, and a valve is installed on the branch pipe. When there are at least two branch pipes, the airflow at the suction hood can be controlled by the valve as needed, so that the electrical components in working state can dissipate heat, further improving the temperature control of the electrical components.

[0023] Preferably, a temperature sensor is installed on the air suction hood, and the temperature sensor is used to detect the air flow temperature around the electrical components.

[0024] The effect is that a temperature sensor is installed on the suction hood to detect the air flow temperature near the suction hood, thereby judging the temperature of the electrical components corresponding to the suction hood, so as to open the valve on the branch pipe in time to dissipate heat for the electrical components.

[0025] By adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0026] The present invention uses an inlet and an outlet connected by a channel up and down through an air flow regulating device, so that the interior of the cabinet is connected through the inlet. When gas enters the bottom of the cabinet, the air flow inside the cabinet can flow from the bottom of the cabinet to the upper part through the exhaust fan. At the same time, the structure of the channel is a Venturi structure. When the air flow passes through the channel, a negative pressure will be formed in the exhaust pipe at the throat of the channel, causing the exhaust pipe to exhaust air. The exhaust will change the direction of the air flow around the suction hood, thereby increasing the amount of air passing around the electrical components that need to increase the heat dissipation, so that the electrical components with large heat generation can dissipate heat more smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the present invention.

[0028] Figure 2 It is a schematic diagram of the structure of the airflow regulating device in the first embodiment of the present invention.

[0029] Figure 3 It is a schematic diagram of the structure of the first embodiment of the present invention in which the cabinet door is omitted.

[0030] Figure 4 It is a schematic diagram of the connection structure of the air extraction pipe in the first embodiment of the present invention.

[0031] Figure 5 It is a structural schematic diagram of the bottom of the cabinet in the first embodiment of the present invention.

[0032] Figure 6 It is a structural schematic diagram of the air guide assembly in the first embodiment of the present invention.

[0033] Figure 7 It is a schematic diagram of the connection structure of the driving device in the second embodiment of the present invention.

[0034] Reference numerals:

[0035] 1. Cabinet body; 11. Cabinet door; 12. Air inlet; 13. Support rail; 14. Bracket;

[0036] 2. air flow regulating device; 21. housing; 211. inlet; 212. outlet; 22. core; 221. channel; 222. air hole; 223. annular groove; 23. sealing ring;

[0037] 3. exhaust pipe; 31. suction hood; 311. mounting plate; 32. branch pipe;

[0038] 4. Installation cavity;

[0039] 5. Driving device; 51. Fixed magnetic ring; 52. Moving magnet; 53. Spring; 54. Protective cover; 55. Raised strip; 56. Power part; 57. Screw; 58. Moving block;

[0040] 6. air guide assembly; 61. air guide plate; 62. air inlet pipe; 63. air outlet pipe; 64. curved plate;

[0041] 7. Fan; 71. Driving wheel; 72. Driving motor; 73. Driving wheel; 74. Transmission belt. DETAILED DESCRIPTION

[0042] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0043] Combine the following Figures 1 to 7 A low voltage switch cabinet of the present invention is described.

[0044] Embodiment 1:

[0045] This embodiment discloses a low voltage switch cabinet, such as Figures 1 to 3 As shown, it includes a cabinet body 1, the overall structure of the cabinet body 1 can be set to a rectangular shape, a cabinet door 11 is set at the front of the cabinet body 1, and the position of the cabinet body 1 where the cabinet door 11 is installed has an opening. The cabinet door 11 can seal the opening of the cabinet body 1 when it is closed, thereby reducing the airflow entering the cabinet body 1 from the position of the cabinet door 11.

[0046] refer to Figure 2, an airflow regulating device 2 is installed on the top of the cabinet 1, and the airflow regulating device 2 can adopt a venturi valve. The airflow regulating device 2 in this embodiment includes a shell 21 and a core 22 arranged inside the shell 21, and the airflow regulating device 2 has an inlet 211 and an outlet 212. One end of the inlet 211 of the airflow regulating device 2 faces the top of the cabinet 1, and the airflow regulating device 2 is fixed in the middle position of the top of the cabinet 1, and the inlet 211 is connected with the inside of the cabinet 1 from the top of the cabinet 1, and one end of the outlet 212 of the airflow regulating device 2 is vertically arranged upward. According to the heat dissipation needs inside the cabinet 1, an exhaust fan can be connected to the outlet 212 of the airflow regulating device 2, and the heat inside the cabinet 1 is extracted by the exhaust fan. The inlet 211 and the outlet 212 in this embodiment are both opened on the shell 21 and are on the same straight line in the vertical direction. The bottom of the cabinet 1 is provided with an air inlet 12, and the air inlet 12 connects the inside of the cabinet 1 with the outside of the cabinet 1. Two support rails 13 are fixedly arranged at the bottom of the cabinet 1. The support rails 13 are made of square profiles. The two support rails 13 are arranged at intervals. The support rails 13 are used to separate the bottom of the cabinet 1 from the ground. The two support rails 13 are arranged in parallel, so that the air inlet 12 is located between the two support rails 13. When the exhaust fan extracts air from the top of the cabinet 1, since the opening of the cabinet 1 is closed by the cabinet door 11, the air flow enters the cabinet 1 from the air inlet 12 at the bottom of the cabinet 1, so that the air flow exchanges heat with the heating electrical components inside the cabinet 1. Due to the heat exchange, the temperature of the gas is increased and further flows to the top of the cabinet 1, so that the heat inside the cabinet 1 is discharged more conveniently, improving the efficiency of heat dissipation. Since the flow direction of the air flow inside the cabinet 1 is the same as the movement direction of the hot air, the hot air inside the cabinet 1 is prevented from being retained in the cabinet 1.

[0047] The air from the external environment enters through the air inlet 12 at the bottom of the cabinet 1, and then the air exchanges heat with the heat-generating electrical components inside the cabinet 1, and then is discharged to the outside of the cabinet 1 from the top of the cabinet 1 through the inlet 211 and the outlet 212 of the air flow regulating device 2. This part is used to comprehensively dissipate the heat inside the cabinet 1, so as to normally dissipate the heat of most of the electrical components inside the cabinet 1. Since the electrical components with excessive heat generation cannot increase the airflow for heat dissipation, the temperature will rise. In order to achieve sufficient heat dissipation for a small number of electrical components with large heat generation, the method commonly used in the prior art is still to increase the flow rate of the overall airflow in the cabinet 1, such as increasing the workload of the exhaust fan. Although this method can control the electrical components with large heat generation within a reasonable temperature range, since most of the increased airflow does not contact the small number of electrical components with large heat generation, thereby increasing the workload of the exhaust fan, the energy utilization rate for dissipating the heat of some electrical components with large heat generation is low.

[0048] refer to Figure 3 and Figure 4 In this embodiment, the housing 21 is connected with an exhaust pipe 3, one end of the exhaust pipe 3 is fixedly connected to the housing 21, and the other end is provided with an air suction hood 31, which can be set to a trumpet-shaped structure, and the exhaust pipe 3 can be set inside the cabinet 1. In other embodiments, it can also be set outside the cabinet 1, the air suction hood 31 is located inside the cabinet 1, and the air suction hood 31 is arranged around the electrical components with large heat generation in the cabinet 1. Since the electrical components themselves have corresponding heat generation when working, when installed inside the cabinet 1, the air suction hood 31 is arranged around the electrical components with large heat generation, and can be arranged according to the heating position of the electrical components. For example, when the top of the electrical component generates a large amount of heat, the air suction hood 31 can be arranged behind the top of the electrical component, or when the bottom of the electrical component generates a large amount of heat, the air suction hood 31 can be arranged behind the electrical component and spaced from the electrical component. When there is more than one electrical component with excessive heat generation in the cabinet 1, a branch pipe 32 is provided between the air suction hood 31 and the exhaust pipe 3, one end of the branch pipe 32 is connected to the exhaust pipe 3, and the other end is connected to the air suction hood 31, so that each electrical component with high heat generation is connected to the exhaust pipe 3 through a corresponding branch pipe 32.

[0049] Combination Figure 2 The core 22 has a channel 221 with a venturi structure inside, and the middle position of the channel 221 is a throat. The upper end of the channel 221 is used to connect to the outlet 212, and the lower end of the channel 221 is used to connect to the inlet 211. The channel 221 has an air hole 222 on the side wall at the throat position. The air hole 222 penetrates the core 22 and is connected to the exhaust pipe 3 through the shell 21, so that the end of the exhaust pipe 3 away from the suction cover 31 is formed with a low pressure by the air flow inside the core 22, so that an air flow from the suction cover 31 to the core 22 will be formed in the exhaust pipe 3. Because the suction cover 31 can concentrate the airflow around the electrical components with high heat generation in the cabinet 1 through the exhaust pipe 3 to guide and change the flow direction, and at the same time increase the amount of gas contacted by the electrical components with high heat generation, so that the heat dissipation of the electrical components can be accelerated. Since the heat dissipation of the electrical components with high heat generation is increased in a targeted manner, the flow rate requirement of the overall airflow inside the cabinet 1 is reduced, and the energy consumed by heat dissipation can be reduced.

[0050] refer to Figure 4, a bracket 14 for fixing the electrical components is provided in the cabinet 1, and a mounting plate 311 can be fixedly provided on the air hood 31, and the mounting plate 311 is fixed on the bracket 14 by screws, so that the air hood 31 is fixed on the bracket 14 through the mounting plate 311. In other embodiments, a valve can be installed on the branch pipe 32, and a temperature sensor can be installed on the air hood 31. The valve can be a solenoid valve. The valve and the temperature sensor are both based on the existing technology and are not disclosed in the accompanying drawings. The valve is used to control the connection of the branch pipe 32, and the temperature sensor is fixed on the air hood 31 away from the mouth of the branch pipe 32. The temperature sensor is used to detect the air flow temperature at the mouth of the air hood 31. When the air flow temperature at the mouth of the air hood 31 is high, the electrical components need to dissipate heat. The valve opens the branch pipe 32 to increase the heat dissipation efficiency of the electrical components. When multiple electrical components with large heat generation are not working at the same time, the air flow in the branch pipe 32 can be controlled by the valve, so as to further make full use of the air flow entering the cabinet 1 to dissipate heat for the electrical components inside the cabinet 1.

[0051] refer to Figure 2 , a mounting cavity 4 is provided inside the shell 21 along the horizontal direction, and the mounting cavity 4 runs through the left and right sides of the shell 21, so that the mounting cavity 4 can be slidably connected to the core 22. The cross section of the mounting cavity 4 in this embodiment is circular, and the circular mounting cavity 4 is more convenient to seal with the cylindrical core 22. In other embodiments, the cross section of the mounting cavity 4 can be set to a square. Three cores 22 are arranged in sequence along the axial direction of the mounting cavity 4, and two cores 22 can also be arranged, and the channels 221 inside the multiple cores 22 are all arranged vertically. Of course, the diameter of the throat of the channel 221 of each core 22 is different, and it can be arranged to decrease from left to right along the axial direction of the mounting cavity 4. An annular groove 223 is provided on the peripheral wall of the core 22, and the cross section of the annular groove 223 can be set to be U-shaped. A sealing ring 23 is installed in the annular groove 223. The annular groove 223 is arranged at both ends of each core 22, and the distance between two adjacent annular grooves 223 is less than the length of the mounting cavity 4. When the channel 221 of a core 22 is opposite to the inlet 211 of the shell 21, the sealing ring 23 seals the core 22 and the shell 21. At the same time, when the core 22 is moved along the length direction of the installation cavity 4, throats of different diameters can generate suction on the inside of the exhaust pipe 3. When a core 22 with a smaller throat diameter is used, the suction inside the exhaust pipe 3 is greater, thereby enhancing the heat dissipation of electrical components with high heat generation.

[0052] The core 22 is connected with a driving device 5, which includes a fixed magnetic ring 51, a moving magnet 52 and a spring 53. A driving device 5 is fixed at both ends of the core 22, and a protective cover 54 is arranged outside the driving device 5. The protective cover 54 is fixed and sealed with the housing 21. The fixed magnetic ring 51 is fixed in the protective cover 54, and the moving magnet 52 is fixed on the core 22. The axial direction of the spring 53 is the same as the sliding direction of the core 22. One end of the spring 53 abuts against the core 22, and the other end abuts against the protective cover 54, so that when the fixed magnetic ring 51 is energized, the moving magnet 52 can push the core 22 to move along the axial direction of the installation cavity 4. At the same time, in order to prevent the core 22 from rotating around the axis of the installation shaft, a convex strip 55 along the installation axis direction can be fixed inside the fixed magnetic ring 51, and a sliding groove cooperating with the convex strip 55 is left on the side wall of the moving magnet 52 to ensure the orientation of the core 22.

[0053] refer to Figure 5 and Figure 6 , an air guide assembly 6 is provided at the air inlet 12 at the bottom of the cabinet 1, and a fan 7 is provided below the air guide assembly 6. The fan 7 and the exhaust fan at the top of the cabinet 1 can be provided at the same time, or only the fan 7 or the exhaust fan can be provided as needed, and an airflow from bottom to top is formed in the cabinet 1 through the fan 7 or the exhaust fan. The air guide assembly 6 includes a plurality of air guide plates 61. Since the bottom of the cabinet 1 is usually in a rectangular shape, in order to evenly distribute the airflow entering the bottom of the cabinet 1, two air inlets 12 are arranged at intervals along the width direction of the cabinet 1 at the bottom of the cabinet 1, and the air guide assembly 6 and the fan 7 are provided at both air inlets 12. The plurality of air guide plates 61 are arranged in sequence along the width direction of the cabinet 1, and the bottom of the plurality of air guide plates 61 in each air guide assembly 6 is above the fan 7, and the upper part of the air guide plate 61 is inclined from the middle of the fan 7 to the width direction of the cabinet 1, so that the airflow blown into the cabinet 1 by the fan 7 can be distributed more evenly.

[0054] A driving wheel 71 is coaxially fixed on both fans 7, a driving motor 72 is fixed at the bottom of the cabinet 1, and the driving motor 72 is located between the two fans 7. A driving wheel 73 is coaxially fixed on the output shaft of the driving motor 72. The driving wheel 73 is connected to the two driving wheels 71 through a transmission belt 74, so that the driving motor 72 drives the two fans 7 to rotate simultaneously.

[0055] A flow channel may be provided inside the plurality of air guide plates 61, and the structure of the flow channel may be S-shaped, straight-line shaped, or folded-line shaped. An air inlet pipe 62 is provided at one end of the air guide plate 61, and an air outlet pipe 63 is provided at the other end. The air inlet pipe 62 and the air outlet pipe 63 are both provided along the arrangement direction of the plurality of air guide plates 61. The air inlet pipe 62 and the air outlet pipe 63 are respectively provided at both ends of the air guide plate 61 and communicated with the flow channel inside the air guide plate 61. The plurality of air guide plates 61 in one air guide assembly 6 are all communicated with the same air inlet pipe 62. When used in a humid and high-temperature environment, such as in coastal areas, the cold air pipe of an air conditioner is connected to the air inlet pipe 62 and the air outlet pipe 63, so that the air conditioner lowers the temperature of the air guide plate 61, thereby condensing the moisture in the air flow to form water droplets, and when the air flow moves along the surface of the air guide plate 61, it may adhere to the air guide plate 61, thereby reducing the moisture in the air flow entering the cabinet 1, and ensuring the safe operation of the electrical components in the cabinet 1. An arc plate 64 is also provided on the upper edge of the air guide plate 61. One end of the arc plate 64 is fixed on the surface of the air guide plate 61 for guiding air, and the other end gradually moves away from the connected air guide plate 61. The middle part of the arc of the arc plate 64 is arched upward. When the airflow reaches the position of the arc plate 64, the airflow is guided by the arc plate 64 to rotate, so that the water droplets formed by the condensation of the airflow are more likely to stick to the arc plate 64.

[0056] The working process of this embodiment:

[0057] The airflow entering from the air inlet 12 at the bottom of the cabinet 1 is first guided by the air guide plate 61 to make the airflow evenly distributed at the bottom of the cabinet 1, and flows upward under the action of the blower or fan 7 to dissipate heat to the electrical components in the cabinet 1, and then enters from the inlet 211 of the airflow adjustment device 2, and then flows out of the cabinet 1 through the channel 221 inside the core 22. At the same time, a low pressure is formed on the exhaust pipe 3 at the throat position of the channel 221, so that the end of the exhaust pipe 3 with the air suction hood 31 increases the airflow passing around the electrical components with large heat generation, thereby improving the heat dissipation efficiency of the electrical components with large heat generation.

[0058] Embodiment 2:

[0059] This embodiment discloses a low voltage switch cabinet, such as Figure 7 As shown, the difference from Example 1 is that: the driving device 5 includes a power piece 56, a screw 57 and a moving block 58, the power piece 56 is fixed on the top of the cabinet 1, the power piece 56 is a servo motor or a stepping motor, the screw 57 is coaxially fixed on the output shaft of the power piece 56, the power piece 56 drives the screw 57 to rotate, the axis of the screw 57 is offset from the axis of the installation cavity 4, the moving block 58 is fixed at one end of the core 22, and the moving block 58 is sleeved on the screw 57 and is threadedly connected to the screw 57, the moving block 58 is moved along the length direction of the screw 57 by the rotation of the screw 57, so that different cores 22 can be moved to the inside of the shell 21.

[0060] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A low voltage switch cabinet, comprising a cabinet body, characterized in that: Also includes: An airflow regulating device, wherein a channel of a venturi structure is formed inside the airflow regulating device, the airflow regulating device has an inlet and an outlet connected to each other through the channel, one end of the inlet of the airflow regulating device is connected to the cabinet at the top of the cabinet, and the outlet of the airflow regulating device is connected to an exhaust fan; An exhaust pipe, one end of which is connected to the airflow regulating device and communicated with the throat of the passage, an exhaust hood is arranged at one end of the exhaust pipe away from the airflow regulating device, the exhaust hood is arranged inside the cabinet, and the exhaust hood is arranged around the electrical components that need to increase heat dissipation; An air inlet is provided at the bottom of the cabinet and is spaced apart from the ground. The gas entering from the bottom of the cabinet flows from bottom to top inside the cabinet and flows out of the cabinet through the channel in the air flow regulating device. At the same time, the air extraction pipe is subjected to the negative pressure generated by the air flow in the channel to increase the air flow around the electrical components at the position of the air suction hood. The airflow regulating device comprises a shell and a core body arranged inside the shell, the inlet and the outlet are located on the shell, the channel is located inside the core body and the two ends of the channel are respectively used to connect the inlet and the outlet, an air hole is opened in the middle of the channel, and the air extraction pipe is connected to the channel through the air hole; The shell is provided with an installation cavity in the horizontal direction, and a core body is slidably connected in the installation cavity. At least two core bodies are arranged along the axial direction of the installation cavity, and the diameters of the middle throats of the channels in the core bodies are set in various ways. The core body is connected with a driving device for driving the core body to move along the axial direction of the installation cavity. The driving device includes a fixed magnetic ring, a moving magnet and a spring. A protective cover is arranged on the outside of the driving device, the protective cover is fixed on the shell, the fixed magnetic ring is fixed inside the protective cover, the moving magnet is fixed on the core body, the length direction of the spring is arranged parallel to the axis of the installation cavity, one end of the spring abuts against the core body, and the other end abuts against the protective cover.

2. A low voltage switch cabinet according to claim 1, characterized in that: The driving device includes a power piece, a screw and a moving block. The power piece adopts a servo motor or a stepping motor. The screw is coaxially fixed on the output shaft of the power piece. The screw is offset from the axis of the installation cavity. The moving block is fixed at the end of the core body. The screw passes through the moving block and is threadedly connected to the moving block.

3. A low voltage switch cabinet according to claim 1, characterized in that: The bottom of the cabinet is rectangular and has two air inlets along the width direction of the cabinet, and each of the air inlets is provided with an air guide component; The air guide assembly includes a plurality of air guide plates, which are arranged along the width direction of the cabinet, and the lower parts of the air guide plates are all located in the air inlet, and the upper sides of the air guide plates are inclined from the middle of the air inlet to both sides in the width direction of the cabinet.

4. A low voltage switch cabinet according to claim 3, characterized in that: A flow channel is provided inside the air guide plate, and an air inlet pipe and an air outlet pipe are respectively provided at both ends of the air guide plate, and the air inlet pipe and the air outlet pipe are both communicated with the flow channels inside the plurality of air guide plates, and the air inlet pipe and the air outlet pipe are used to connect to the cold air pipe of the air conditioner; An arc plate is arranged on the upper edge of the wind guide plate, one end of the arc plate is fixed on the wind guide surface of the wind guide plate, the other end is away from the wind guide plate connected to the arc plate, and the middle part of the arc plate is arched upward.

5. A low voltage switch cabinet according to claim 4, characterized in that: A fan is arranged below the air guide assembly, and driving wheels are coaxially fixed on the two fans. A driving motor is fixed at the bottom of the cabinet, and a driving wheel is coaxially fixed on the output shaft of the driving motor. The driving wheel and the two driving wheels are connected through a transmission belt.

6. A low voltage switch cabinet according to claim 1, characterized in that: A branch pipe is arranged between the air extraction pipe and the air suction hood, and at least two branch pipes are arranged. One branch pipe is connected to an air suction hood, and a valve for controlling the connection of the branch pipes is connected to the branch pipe.

7. A low voltage switch cabinet according to claim 6, characterized in that: A temperature sensor is installed on the air suction hood, and the temperature sensor is used to detect the air flow temperature around the electrical components.

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