A modular low-voltage switchgear for a constant current power supply system

Abstract

This invention discloses a modular low-voltage switchgear for a constant current power supply system, relating to the field of switchgear technology. The modular low-voltage switchgear for a constant current power supply system includes a cabinet. A switch controller is fixed to the bottom of the inner wall of the cabinet. An electromagnet is electrically connected to the top of the switch controller, and a mating magnetic block is disposed on the front side of the electromagnet. In this modular low-voltage switchgear for a constant current power supply system, the magnetic strength of the electromagnet is directly proportional to the magnitude of the current flowing through the cabinet. That is, a change in the magnitude of the current flowing through the cabinet will cause a corresponding change in the magnetic strength of the electromagnet, which in turn causes a corresponding change in the repulsive force of the electromagnet on the mating magnetic block. Under the action of this changing repulsive force, the mating magnetic block moves, thereby changing the resistance of the sliding rheostat to balance some of the resistance changes in the switchgear caused by component losses, thus avoiding excessive current fluctuations.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of switch cabinet, in particular to a modular low-voltage switch cabinet for constant-current power supply system. BACKGROUND

[0002] The switch cabinet is an important electrical equipment used in power supply system, which mainly realizes the control of power-on and power-off of each branch, and the modular low-voltage switch cabinet refers to the switch cabinet used in low-voltage circuit, which is composed of control module, heat dissipation module and other modules.

[0003] The constant-current power supply system refers to the use of automatic voltage device in the circuit, so that the current size remains constant when the voltage increases or decreases, preventing the normal work of some electrical equipment affected by the over-high or over-low current, and in the low-voltage circuit, since the voltage is low and stable, and according to the current calculation formula I=U / R, when the resistance in the circuit system changes, the current will also change, and the automatic voltage device is generally used in the power transmission end, and when the internal elements of the switch cabinet at the user end are consumed for a long time and the resistance changes, the current value output by the switch cabinet will also change, thereby affecting the use of electrical equipment. SUMMARY

[0004] (I) Technical problems solved

[0005] In view of the deficiencies of the prior art, the present application provides a modular low-voltage switch cabinet for constant-current power supply system, which solves the problem that the automatic voltage device is generally used in the power transmission end, and when the internal elements of the switch cabinet at the user end are consumed for a long time and the resistance changes, the current value output by the switch cabinet will also change, thereby affecting the use of electrical equipment.

[0006] (II) Technical solutions

[0007] In order to achieve the above object, the present application is realized by the following technical scheme: A modular low-voltage switch cabinet for constant current power supply system, comprising a cabinet body, a switch controller is fixed to the inner wall bottom of the cabinet body, an electromagnet is electrically connected to the top of the switch controller, a matching magnetic block is arranged on the front side of the electromagnet, the bottom of the matching magnetic block is fixed to the control end of a sliding rheostat, and the initial position of the control end of the sliding rheostat is located at the overall center of the resistance coil of the sliding rheostat, the sliding rheostat is electrically connected to the switch controller, that is, one connection end of the sliding rheostat is connected to one interface of the switch controller through a wire, and the control end is connected to another interface of the switch controller through a wire, a set of cooling fans is arranged on the bottom of the sliding rheostat, the set of cooling fans is fixed to pass through the inner and outer walls of the cabinet body, and the top of the set of cooling fans is electrically connected to a sliding speed changer, a slidable control end is arranged on the sliding speed changer, the control end can adjust the rotating speed of the set of cooling fans during movement, and the control end of the sliding speed changer is fixed to the control end of the sliding rheostat through a connecting rod; when the electromagnet is powered on, the magnetic poles of the front side and the rear side of the matching magnetic block are the same, that is, the electromagnet and the matching magnetic block repel each other; according to the magnetic field strength calculation formula H=N×I / Le (H is the magnetic field strength, the unit is A / m; N is the number of turns of the excitation coil; I is the excitation current (measured value), the unit is A; Le is the effective magnetic circuit length of the test sample, the unit is m), it can be known that the magnetic strength of the electromagnet is proportional to the current flowing through the cabinet body, that is, the change of the current flowing through the cabinet body will cause the corresponding change of the magnetic strength of the electromagnet, and then the repulsion of the electromagnet to the matching magnetic block will change correspondingly, the matching magnetic block will move under the action of the changed repulsion, and then the resistance of the sliding rheostat can be changed, so as to balance part of the resistance change of the switch cabinet due to element loss, thereby avoiding the case that the current changes too much; and when the matching magnetic block controls the resistance change of the sliding rheostat, the cooling effect of the set of cooling fans can be controlled through the sliding speed changer, so that when the resistance of the sliding rheostat increases, the stronger cooling effect can be realized, so as to keep the temperature in the cabinet body stable and prevent the temperature in the cabinet body from being too high or too low to affect the normal use.

[0008] Preferably, an air inlet is arranged at the top of the cabinet body, an air inlet device is fixed in the air inlet, a filter screen is fixed to the top inner wall of the air inlet device, and a water absorption sponge is fixed to the bottom of the filter screen; by arranging the filter screen, the air entering the cabinet body can be filtered to prevent foreign matters from entering the cabinet body, and by arranging the water absorption sponge, the liquid water vapor entering the cabinet body can be absorbed to prevent the water vapor from corroding the elements in the cabinet body.

[0009] Preferably, the water absorption sponge is composed of a fixed sponge and a movable sponge, the movable sponge is movably inserted into the side of the fixed sponge, and the movable sponge is fixed with an iron control plate on one side outside the fixed sponge, the iron control plate is located on the side of the electromagnet and is magnetically adsorbed with the electromagnet, the iron control plate can be adsorbed by the magnet, and the distance between the iron control plate and the electromagnet is small, the magnetism carried by the electromagnet after being electrified can adsorb the iron control plate, the iron control plate movably penetrates the inner and outer walls of the side of the air inlet device, and a spring is arranged between the iron control plate and the air inlet device; when the magnetic adsorption force of the electromagnet on the iron control plate is greater than the elastic force of the spring, the iron control plate drives the movable sponge to move out of the fixed sponge, at this time, the resistance of the whole water absorption sponge to air is reduced, so that the air inlet amount can be increased, and the heat dissipation effect is enhanced, and the high temperature inside the cabinet body caused by excessive heat generated by the sliding rheostat is prevented.

[0010] Preferably, the top of the cabinet body is fixed with one end of the elastic telescopic rod, the other end of the elastic telescopic rod is fixed with the rain shielding device, the center of the rain shielding device is concave downward, a water leakage hole is formed through the center of the rain shielding device, and a drain pipe is arranged at the bottom of the water leakage hole; the rain shielding device can shield the top of the air inlet device, prevent water from entering the cabinet body when the switch cabinet is installed outdoors in rainy weather, and improve the shielding effect of the rain shielding device on the air inlet device as more rainwater is stored in the top of the rain shielding device, the rain shielding device becomes heavier and descends. Part of the rainwater in the rain shielding device flows out through the drain pipe.

[0011] Preferably, two water blocking devices are arranged on the top of the rain shielding device, the water blocking device comprises a water blocking plate, a transverse movable block and a driving plate, the water blocking plate is located on the top of the water leakage hole, the two water blocking plates in the two water blocking devices are in contact with each other at one end close to each other, the two water blocking plates are fixed with the transverse movable block at one end away from each other, the transverse movable block is slidably arranged on the top of the rain shielding device, a driving hole is formed in the bottom of the transverse movable block, the right side of the driving hole is arranged in an inclined shape with the left side being higher than the right side, the top of the driving plate is located below the right side of the driving hole, and the bottom of the driving plate is fixed with the top of the cabinet body; the water blocking device can block the rainwater in the rain shielding device, only when the rain shielding device descends to a certain distance, the driving plate separates the two water blocking plates through the transverse movable block, and the rainwater in the rain shielding device enters the drain pipe, so that the water storage effect of the rain shielding device is ensured, and the distance between the rain shielding device and the air inlet device is prevented from being too far due to the too fast water discharge speed of the rain shielding device.

[0012] Preferably, the bottom of the rain-shielding device is fixed to the mounting strip, and a scraper is hinged to the bottom of the mounting strip. The scraper is arranged with the front higher than the back, and the bottom of the scraper contacts the top of the filter screen. The two ends of the mounting strip are located on both sides of the rain-shielding device, and multiple semi-cylindrical mating strips are fixed to the top of the two ends of the mounting strip. A drive column is provided between the multiple semi-cylindrical mating strips and the rain-shielding device, and the drive column is fixed on the transverse movable block. By setting the scraper, the downward movement of the rain-shielding device can scrape the top of the filter screen, thereby removing impurities from the top of the filter screen. By setting the drive column, the rightward movement of the transverse movable block can cause it to collide with the multiple semi-cylindrical mating strips in sequence. The vibration generated by this collision can be transmitted to the scraper and the filter screen, causing impurities on the scraper and the filter screen surface to loosen and fall off.

[0013] Preferably, a shield is fixed to the side of the rain shield device. The shield includes a vertical part and an inclined part. The vertical part contacts the side of the cabinet, the inclined part is located at the bottom of the vertical part, and the entire shield is located above the cooling fan assembly. By setting the shield, the cooling fan assembly can be protected to prevent rainwater from entering the cooling fan assembly.

[0014] (III) Beneficial Effects

[0015] This invention provides a modular low-voltage switchgear for a constant current power supply system. It offers the following advantages:

[0016] (1) The constant current power supply system uses a modular low-voltage switch cabinet. The magnetic strength of the electromagnet is proportional to the magnitude of the current flowing through the cabinet. That is, the change in the magnitude of the current flowing through the cabinet will cause a corresponding change in the magnetic strength of the electromagnet, which in turn causes a corresponding change in the repulsive force of the electromagnet on the mating magnetic block. The mating magnetic block moves under the action of this changing repulsive force, which can change the resistance of the sliding rheostat to balance part of the resistance change caused by component losses in the switch cabinet, thereby avoiding excessive current changes.

[0017] (2) The constant current power supply system uses a modular low-voltage switch cabinet. By setting a filter screen, the air entering the cabinet can be filtered to prevent external impurities from entering the cabinet. The water-absorbing sponge can absorb the liquid water vapor in the air entering the cabinet to prevent water vapor from corroding the components inside the cabinet.

[0018] (3) The constant current power supply system uses a modular low-voltage switch cabinet. When the magnetic attraction force of the electromagnet to the iron control board is greater than the elastic force of the spring, the iron control board drives the movable sponge to move out of the fixed sponge. At this time, the overall resistance of the water-absorbing sponge to the air decreases, thereby increasing the air intake and enhancing the heat dissipation effect, preventing the sliding rheostat from generating too much heat and causing the internal temperature of the cabinet to be too high.

[0019] (4) The constant current power supply system uses a modular low-voltage switch cabinet. By setting a water-blocking device, the rainwater in the rain shelter can be blocked. Only after the rain shelter descends to a certain distance, the drive plate separates the two water-blocking plates through the horizontal movable block, and the rainwater in the rain shelter will enter the drain pipe, thus ensuring the water storage effect of the rain shelter and avoiding the water in the rain shelter being discharged too quickly, which would cause the distance between the rain shelter and the air intake device to be too far.

[0020] (5) The constant current power supply system uses a modular low-voltage switch cabinet. By setting a scraper, the top of the filter screen can be scraped by the downward movement of the rain shield, thereby removing the impurities on the top of the filter screen. The drive column can be moved to the right by the rightward movement of the horizontal movable block to hit multiple semi-cylindrical mating strips in sequence. The vibration generated by the impact can be transmitted to the scraper and the filter screen, causing the impurities on the scraper and the filter screen surface to loosen and fall off. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a partial sectional view of the entire invention;

[0023] Figure 3 For the present invention Figure 2 Enlarged structural diagram of section A;

[0024] Figure 4 This is a partial cross-sectional view of the air intake device in this invention;

[0025] Figure 5 This is a longitudinal half-sectional view of the rain-shielding device in this invention;

[0026] Figure 6 This is a perspective view of the rear side of the mounting strip in this invention.

[0027] In the diagram: 1. Cabinet; 2. Switch controller; 3. Electromagnet; 4. Matching magnetic block; 5. Sliding rheostat; 6. Cooling fan assembly; 61. Sliding gearbox; 7. Air intake device; 71. Filter screen; 72. Iron control board; 73. Water-absorbing sponge; 731. Fixed sponge; 732. Movable sponge; 8. Rainproof device; 81. Drain pipe; 82. Mounting strip; 821. Scraper; 822. Semi-cylindrical matching strip; 83. Baffle plate; 9. Water-blocking device; 91. Water baffle plate; 92. Horizontal movable block; 921. Drive column; 93. Drive plate. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figures 1-6 This invention provides a technical solution: a modular low-voltage switchgear for a constant current power supply system, comprising a cabinet 1, a switch controller 2 fixed to the bottom of the inner wall of the cabinet 1, an electromagnet 3 electrically connected to the top of the switch controller 2, a mating magnetic block 4 disposed on the front side of the electromagnet 3, the bottom of the mating magnetic block 4 being fixed to the control terminal of a sliding rheostat 5, and the initial position of the control terminal of the sliding rheostat 5 being located at the overall center of the resistance coil on the sliding rheostat 5, the sliding rheostat 5 being electrically connected to the switch controller 2, that is, one connection terminal of the sliding rheostat 5 is connected via a wire. The control terminal is connected to the switch controller 2 via one interface and to the switch controller 2 via another interface via a wire. A cooling fan assembly 6 is installed at the bottom of the sliding rheostat 5. The cooling fan assembly 6 is fixedly connected through the inner and outer walls of the cabinet 1, and a sliding gearbox 61 is electrically connected to the top of the cooling fan assembly 6. A sliding control terminal is installed on the sliding gearbox 61, which can adjust the speed of the cooling fan assembly 6 during movement. The control terminal of the sliding gearbox 61 is fixed to the control terminal of the sliding rheostat 5 via a connecting rod. When the electromagnet 3 is energized, the front side and the rear side of the mating magnetic block 4... Since the magnetic poles are the same, electromagnet 3 and the mating magnetic block 4 are magnetically repelled. According to the magnetic field strength calculation formula H = N × I / Le (H is the magnetic field strength, in A / m; N is the number of turns of the excitation coil; I is the excitation current (measured value), in A; Le is the effective magnetic path length of the test sample, in m), the magnetic strength of electromagnet 3 is directly proportional to the magnitude of the current flowing through cabinet 1. That is, changes in the current flowing through cabinet 1 will cause a corresponding change in the magnetic strength of electromagnet 3, which in turn will cause a corresponding change in the repulsive force of electromagnet 3 on mating magnetic block 4. The magnetic block 4 moves under the influence of the changing repulsive force, thereby changing the resistance of the sliding rheostat 5. This balances the resistance changes caused by component losses in the switch cabinet, thus preventing excessive current changes. Furthermore, when the magnetic block 4 controls the resistance change of the sliding rheostat 5, it controls the cooling effect of the cooling fan group 6 through the sliding gearbox 61. This results in a stronger cooling effect when the resistance of the sliding rheostat 5 increases, maintaining a stable internal temperature of the cabinet 1 and preventing excessively high or low internal temperatures from affecting normal operation.

[0030] Preferably, in this embodiment, an air inlet is provided on the top of the cabinet 1, and an air intake device 7 is fixed inside the air inlet. A filter screen 71 is fixed on the top of the inner wall of the air intake device 7, and the bottom of the filter screen 71 is fixed to the water-absorbing sponge 73. By setting the filter screen 71, the air entering the cabinet 1 can be filtered to prevent external impurities from entering the cabinet 1. The water-absorbing sponge 73 can adsorb the liquid water vapor in the air entering the cabinet 1 to prevent water vapor from corroding the components inside the cabinet 1.

[0031] Preferably, in this embodiment, the absorbent sponge 73 consists of a fixed sponge 731 and a movable sponge 732. The movable sponge 732 is movably inserted into the side of the fixed sponge 731, and an iron control plate 72 is fixed to the side of the movable sponge 732 outside the fixed sponge 731. The iron control plate 72 is located on the side of the electromagnet 3 and is magnetically attracted to the electromagnet 3. The iron control plate 72 can be attracted by a magnet, and the distance between the iron control plate 72 and the electromagnet 3 is small. After the electromagnet 3 is energized, its own magnetism will attract... The iron control plate 72 is used for adsorption. The iron control plate 72 moves through the inner and outer walls of the side of the air intake device 7, and a spring is provided between the iron control plate 72 and the air intake device 7. When the magnetic attraction force of the electromagnet 3 on the iron control plate 72 is greater than the elastic force of the spring, the iron control plate 72 drives the movable sponge 732 to move out of the fixed sponge 731. At this time, the overall resistance of the water-absorbing sponge 73 to the air decreases, thereby increasing the air intake volume and enhancing the heat dissipation effect, preventing the sliding rheostat 5 from generating too much heat and causing the internal temperature of the cabinet 1 to be too high.

[0032] Preferably, in this embodiment, the top of the cabinet 1 is fixed to one end of the elastic telescopic rod, and the other end of the elastic telescopic rod is fixed to the rainproof device 8. The center of the rainproof device 8 is recessed downward, and a drain outlet is provided through the center of the rainproof device 8. A drain pipe 81 is provided at the bottom of the drain outlet. By setting the rainproof device 8, the top of the air intake device 7 can be blocked, preventing water from entering the cabinet 1 when the switch cabinet is installed outdoors and encounters rainy weather. At the same time, as more rainwater is stored on the top of the rainproof device 8, the rainproof device 8 becomes heavier and lowers, thereby improving the blocking effect of the rainproof device 8 on the air intake device 7. Some of the rainwater in the rainproof device 8 flows out through the drain pipe 81.

[0033] Preferably, in this embodiment, the top of the rainproof device 8 is provided with two water-blocking devices 9. Each water-blocking device 9 includes a water-blocking plate 91, a transverse movable block 92, and a drive plate 93. The water-blocking plate 91 is located at the top of the drain outlet, and the two water-blocking plates 91 are in contact with each other at their closest points. The two water-blocking plates 91 are fixed to the transverse movable block 92 at their furthest points. The transverse movable block 92 is slidably mounted on the top of the rainproof device 8 in a left-right direction, and a drive port is provided at the bottom of the transverse movable block 92. The right side of the drive port is inclined with the left side higher than the right side. The drive plate 93 is set at an angle, with its top located below the right side of the drive port and its bottom fixed to the top of the cabinet 1. The water-blocking device 9 can block rainwater in the rain shelter 8. Only after the rain shelter 8 has descended to a certain distance will the drive plate 93 separate the two water-blocking plates 91 through the horizontal movable block 92, allowing the rainwater in the rain shelter 8 to enter the drain pipe 81. This ensures the water storage effect of the rain shelter 8 and prevents the water in the rain shelter 8 from draining too quickly, which would cause the distance between the rain shelter 8 and the air intake device 7 to be too far.

[0034] Preferably, in this embodiment, the bottom of the rain-shielding device 8 is fixed to the mounting strip 82. A scraper 821 is hinged to the bottom of the mounting strip 82. The scraper 821 is arranged with a higher front and lower back, and the bottom of the scraper 821 contacts the top of the filter screen 71. The two ends of the mounting strip 82 are located on both sides of the rain-shielding device 8, and multiple semi-cylindrical mating strips 822 are fixed to the top of both ends of the mounting strip 82. A driving column 921 is arranged between the multiple semi-cylindrical mating strips 822 and the rain-shielding device 8. The driving column 921 is fixed on the transverse movable block 92. By setting the scraper 821, the top of the filter screen 71 can be scraped by the downward movement of the rain-shielding device 8, thereby removing impurities from the top of the filter screen 71. The driving column 921 can collide with the multiple semi-cylindrical mating strips 822 in sequence by the rightward movement of the transverse movable block 92. The vibration generated by the collision can be transmitted to the scraper 821 and the filter screen 71, causing impurities on the surface of the scraper 821 and the filter screen 71 to loosen and fall off.

[0035] Preferably, in this embodiment, a shielding plate 83 is fixed to the side of the rain shielding device 8. The shielding plate 83 includes a vertical part and an inclined part. The vertical part is in contact with the side of the cabinet 1, the inclined part is located at the bottom of the vertical part, and the shielding plate 83 is located above the cooling fan assembly 6. By setting the shielding plate 83, the cooling fan assembly 6 can be protected to prevent rainwater from entering the interior of the cooling fan assembly 6.

[0036] In this embodiment, the working principle is as follows: The switch controller 2 is connected to one power transmission terminal and multiple user terminals. The switch controller 2 can control the power supply to multiple user terminals. When the current flowing through the switch controller 2 changes due to resistance, the current flowing through the electromagnet 3 changes. This changes the magnetism generated by the electromagnet 3, altering the repulsive force between the electromagnet 3 and the cooperating magnetic block 4. The cooperating magnetic block 4 then moves the control terminal of the sliding rheostat 5, thereby changing the resistance of the sliding rheostat 5. Furthermore, when the repulsive force between the electromagnet 3 and the cooperating magnetic block 4 increases, the movement of the cooperating magnetic block 4 further increases the resistance of the sliding rheostat 5. The increase in resistance of the sliding rheostat 5 will adjust the resistance of the entire switch cabinet, thereby achieving automatic current regulation and ensuring a certain degree of constant current in the circuit. At the same time, the movement of the magnetic block 4 will also drive the connecting rod to slide the control end of the sliding gearbox 61, changing the fan speed in the cooling fan group 6. When the resistance of the sliding rheostat 5 increases, the fan speed in the cooling fan group 6 increases, and when the resistance of the sliding rheostat 5 decreases, the fan speed in the cooling fan group 6 decreases, so as to ensure that the temperature inside the cabinet 1 is within a certain range and prevent excessively high or low temperatures from affecting the normal operation of the internal components of the cabinet 1.

[0037] When the cooling fan assembly 6 exhausts air, the cabinet 1 takes in air through the air intake device 7. The air entering the cabinet 1 passes through the filter screen 71 and the water-absorbing sponge 73. The filter screen 71 blocks impurities in the air, and the water-absorbing sponge 73 absorbs moisture in the air, preventing impurities and moisture in the air from affecting the electronic components inside the cabinet 1. At the same time, the magnetism of the electromagnet 3 increases to the point that the magnetic attraction force of the electromagnet 3 on the iron control board 72 is greater than the spring force. The iron control board 72 drives the movable sponge 732 to move. At this time, the thickness of some areas of the water-absorbing sponge 73 decreases, thereby reducing the blocking effect of the water-absorbing sponge 73 on the air and increasing the intake speed. Since the exhaust speed of the cooling fan assembly 6 is relatively fast at this time, and the heat generated by the sliding rheostat 5 is also relatively large, the air containing moisture will not stay inside the cabinet 1 for a long time, so the impact on the components inside the cabinet 1 is also small.

[0038] When this switchgear is installed outdoors and encounters rain, the rain shelter 8 protects the air intake device 7, and rainwater will remain on top of the rain shelter 8. As the rainwater increases, the weight of the rain shelter 8 increases and it descends. At this time, the distance between the rain shelter 8 and the air intake device 7 decreases, improving the protection effect. When the rain shelter 8 descends to a certain distance, the top of the drive plate 93 contacts the inclined surface on the right side of the drive port of the transverse movable block 92. As the transverse movable block 92 continues to move downward, the drive plate 93 will slide on the inclined surface on the right side of the drive port. At this time, the top of the drive plate 93 will generate a thrust perpendicular to the inclined surface. The horizontal component of this thrust causes the transverse movable block 92 to move horizontally. The transverse movable block 92 drives the water baffle 91 to move. When the two baffle plates 91 separate, the rainwater inside the rain shelter 8 passes through the gap between the two baffle plates 91 and is discharged through the drain pipe 81. When the rain shelter 8 descends, the scraper 821 is tilted and the top of the scraper 821 descends. At this time, the bottom of the scraper 821 moves backward on the top of the filter screen 71 to push the impurities on the top of the filter screen 71 backward. At the same time, the scraper 821 also shields the top of the air intake device 7, achieving a complete protection effect. When the horizontal moving block 92 moves horizontally, it will drive the drive column 921 to move. The drive column 921 will collide with multiple semi-cylindrical mating strips 822. The impact kinetic energy will be transmitted to the scraper 821 and the filter screen 71 through the mounting strip 82, causing the impurities on the scraper 821 and the filter screen 71 to loosen and fall off.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A modular low voltage switchgear for constant current power supply system comprising a cabinet (1), characterized in that: The inner wall bottom of the cabinet (1) is fixed with a switch controller (2), the top of the switch controller (2) is electrically connected with an electromagnet (3), the front side of the electromagnet (3) is provided with a matching magnetic block (4), the bottom of the matching magnetic block (4) is fixed with the control end of a sliding rheostat (5), the sliding rheostat (5) is electrically connected with the switch controller (2), the bottom of the sliding rheostat (5) is provided with a heat dissipation fan group (6), the heat dissipation fan group (6) is fixed through the inner and outer walls of the cabinet (1), and the top of the heat dissipation fan group (6) is electrically connected with a sliding speed changer (61), and the control end of the sliding speed changer (61) is fixed with the control end of the sliding rheostat (5) through a connecting rod.

2. A modular low voltage switchgear for constant current power supply system as claimed in claim 1 wherein: The electromagnet (3) and the matching magnetic block (4) are magnetically repelled.

3. A modular low voltage switchgear panel for constant current power supply system as claimed in claim 1 wherein: The top of the cabinet (1) is provided with an air inlet, the inside of the air inlet is fixed with an air inlet device (7), the inner wall top of the air inlet device (7) is fixed with a filter screen (71), and the bottom of the filter screen (71) is fixed with a water absorbing sponge (73).

4. A modular low voltage switchgear panel for constant current power supply system as claimed in claim 3 wherein: The water absorbing sponge (73) is composed of a fixed sponge (731) and a movable sponge (732), the movable sponge (732) is movably inserted into the side of the fixed sponge (731), one side of the movable sponge (732) located outside the fixed sponge (731) is fixed with an iron control plate (72), the iron control plate (72) is located on the side of the electromagnet (3) and is magnetically adsorbed and connected with the electromagnet (3), the iron control plate (72) movably penetrates the inner and outer walls of the side of the air inlet device (7), and a spring is arranged between the iron control plate (72) and the air inlet device (7).

5. A modular low voltage switchgear panel for constant current power supply system as claimed in claim 3 wherein: The top of the cabinet (1) is fixed with one end of an elastic telescopic rod, the other end of the elastic telescopic rod is fixed with a rain shielding device (8), the center of the rain shielding device (8) is recessed downward, a water leakage hole is formed through the center of the rain shielding device (8), and a drain pipe (81) is arranged at the bottom of the water leakage hole.

6. A modular low voltage switchgear for constant current power supply system as claimed in claim 5 wherein: The top of the rain shielding device (8) is provided with two water blocking devices (9), the water blocking device (9) comprises a water blocking plate (91), a transversely movable block (92) and a driving plate (93), the water blocking plate (91) is located at the top of the water leakage hole, the two water blocking plates (91) in the two water blocking devices (9) are in contact with each other at one end close to each other, the two water blocking plates (91) are fixed with the transversely movable block (92) at one end away from each other, the transversely movable block (92) is slidably installed on the top of the rain shielding device (8), a driving hole is formed in the bottom of the transversely movable block (92), the right side of the driving hole is arranged in an inclined shape with the left side being higher than the right side, and the top of the driving plate (93) is located below the right side of the driving hole, and the bottom of the driving plate (93) is fixed with the top of the cabinet (1).

7. A modular low voltage switchgear panel for constant current power supply system as claimed in claim 6 wherein: The bottom of the rain shielding device (8) is fixed with a mounting strip (82), the bottom of the mounting strip (82) is hingedly provided with a scraper (821), the scraper (821) is arranged in a manner that the front is high and the rear is low, the bottom of the scraper (821) is in contact with the top of the filter screen (71), the two ends of the mounting strip (82) are located on the two sides of the rain shielding device (8), the top of the two ends of the mounting strip (82) is fixed with a plurality of semicylindrical matching strips (822), a driving column strip (921) is arranged between the plurality of semicylindrical matching strips (822) and the rain shielding device (8), and the driving column strip (921) is fixed on a transversely movable block (92).

8. A modular low voltage switchgear panel for constant current power supply system as claimed in claim 5 wherein: The side of the rain shielding device (8) is fixed with a shielding plate (83), the shielding plate (83) comprises a vertical portion and an inclined portion, the vertical portion is in contact with the side of the cabinet body (1), the inclined portion is located at the bottom of the vertical portion, and the shielding plate (83) is located above the heat dissipation fan group (6) as a whole.

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