Novel moisture-proof low-voltage switch cabinet

Abstract

A novel moisture-proof low-voltage switch cabinet belongs to the technical field of switch cabinets and comprises a low-voltage switch cabinet body, a humidity sensor, an electric push rod, a negative-pressure fan, a detection circuit, a temperature control circuit and a heating and filtering mechanism. The humidity sensor, the electric push rod, the negative pressure fan, the detection circuit, the temperature control circuit, the heating and filtering mechanism and the low-voltage switch cabinet body are installed together. Through the magnet sheet at the rear side end of the cabinet door and the sealing gasket at the front side of the cabinet body, the probability that external humid air enters the cabinet body through the cabinet door and a front gap of the cabinet body can be effectively reduced, and under the action of the electric push rod, a worker can conveniently open the cabinet door; when the humidity of air in the cabinet body is larger than a certain value, under the action of the detection circuit, the humidity sensor, the temperature control circuit and the like, humid air in the cabinet body can be pumped out in time through the negative pressure fan, the interior of the cabinet body can be heated according to needs, the dehumidification efficiency is improved, and it is guaranteed that the switch cabinet body can work normally and stably as far as possible.

Description

Technical Field

[0001] The utility model relates to the technical field of switch cabinet equipment, in particular to a novel moisture-proof low-voltage switch cabinet. Background Art

[0002] Low-voltage distribution cabinets are devices used for the conversion, distribution, and control of electrical energy. They are primarily used in distribution systems operating at 50Hz AC and a rated voltage of 380V. By assembling switches, circuit breakers, fuses, buttons, indicator lights, meters, wires, and other protective devices, they achieve the functions of power distribution, control, metering, and cable connection, making power supply safer and more efficient. With the advancement of power technology, distribution cabinets have become increasingly versatile. For example, my country's authorized patent, patent number "201620331958.3," titled "Low-voltage Switchgear," states that "the cover plate of the main busbar chamber of this utility model, facing the direction of busbar insertion, is hingedly connected. When installing and maintaining the main busbar of the entire low-voltage switchgear, it is only necessary to open the hinged cover plate and insert or remove the main busbar from the insulating busbar frame. The operation is simple and convenient, greatly simplifying the installation steps, shortening the time required for operation, and improving work efficiency."

[0003] As can be seen from the above, although the comparative patent has achieved the purpose of the invention to a certain extent, it is limited by the structure and has the following technical shortcomings, just like the existing low-voltage distribution cabinet technology in this field. First, it does not have a dehumidification function. When humid air gathers in the cabinet, the humid air cannot be removed in time, and there is a possibility that the internal electrical equipment will malfunction due to excessive humidity, reduced insulation performance, or even short circuits; second, the junction between the rear end of the cabinet door and the solid front end is affected by the processing technology or other factors, and the junction between the two cannot be guaranteed to be in a fully sealed state. In this way, there is a possibility that external humid air enters the cabinet. In summary, it is particularly necessary to provide a low-voltage switch cabinet that can effectively seal the cabinet door and the counter front and can realize the automatic dehumidification function. Utility Model Content

[0004] In order to overcome the drawbacks of existing low-voltage distribution cabinets due to structural limitations as described in the background technology, the utility model provides a new type of moisture-proof low-voltage switch cabinet based on a low-voltage switch cabinet body, which can effectively seal the rear end of the cabinet door and the front end of the cabinet body under the joint action of relevant mechanisms, thereby minimizing the chance of external humid air entering the cabinet body, and when the air humidity in the cabinet is greater than a certain level, the humid air in the cabinet body can be promptly extracted by a negative pressure fan, and the cabinet body can be heated as needed, thereby improving the dehumidification efficiency.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A new type of moisture-proof low-voltage switch cabinet, including a low-voltage switch cabinet body, a humidity sensor, an electric push rod, a negative pressure fan, and also has a detection circuit, a temperature control circuit, and a heating and filtering mechanism; the heating and filtering mechanism includes a shell and a first solenoid valve, an electric heating plate, and a filter box. The shell has an air inlet pipe and an exhaust pipe on both sides, the electric heating plate is installed in the shell, one side end of the first solenoid valve is connected to the air inlet pipe, and the side end of the filter box is connected to the other side end of the first solenoid valve; the cabinet side end and the upper end of the switch cabinet body are respectively installed with ventilation pipes, the side end ventilation pipes are connected to the exhaust pipe, the negative pressure fan is equipped with a second solenoid valve, and the air inlet end of the negative pressure fan is connected to the ventilation pipe on the upper end of the cabinet , the upper end of the exhaust end of the negative pressure fan is connected to one end of the second solenoid valve; the electric push rod is installed on one side end of the cabinet, a sealing gasket is installed around the front end of the cabinet, and a magnet is installed on the rear side of the cabinet door of the distribution cabinet body; the humidity sensor, detection circuit, and temperature control circuit are installed in the component box, and the component box is installed in the cabinet; the signal output end of the humidity sensor is electrically connected to the signal input end of the detection circuit, the power output end of the detection circuit is electrically connected to the first solenoid valve, the second solenoid valve, the power input end of the negative pressure fan and the signal input end of the temperature control circuit, and the power output end of the temperature control circuit is electrically connected to the power input end of the electric heating plate.

[0007] Preferably, the first solenoid valve and the second solenoid valve are normally closed valve core solenoid valves.

[0008] Preferably, the inner and outer diameters of the magnet sheet are consistent with those of the sealing gasket.

[0009] Preferably, when the front end of the push column of the electric push rod is located at the rear dead point and the cabinet door is closed, the distance between the rear end of the cabinet door and the front end of the push column is.

[0010] Preferably, the detection circuit includes an electrically connected resistor and an adjustable resistor, a relay, and a transistor, one end of the adjustable resistor is connected to one end of the first resistor and one end of the second resistor, the other end of the second resistor is connected to the base of the transistor, the collector of the transistor is connected to the negative power input end of the relay, the positive pole of the relay is connected to the control power input end, and the other end of the first resistor is connected to the emitter of the transistor.

[0011] Preferably, the temperature control circuit includes a temperature control switch and a relay that are electrically connected, one end of the temperature control switch is connected to the positive power input end of the relay, and the internal contact type of the temperature control switch is a normally open structure.

[0012] Compared with the existing technology, the beneficial effects of the present invention are as follows: (1): Based on the low-voltage distribution cabinet body, the present invention can effectively reduce the probability of external moist air entering the cabinet through the gap between the cabinet door and the front of the cabinet body through the magnet sheet at the rear end of the cabinet door and the sealing gasket at the front of the cabinet body. Under the action of the electric push rod, the staff can easily open the cabinet door and prevent the magnet and the front of the cabinet from being tightly attracted together, which causes inconvenience to the staff when opening the door (relatively large force is required to open the cabinet door); (2): When the humidity of the air in the cabinet is greater than a certain level, under the action of the detection circuit, humidity sensor and temperature control circuit, the moist air in the cabinet body can be promptly extracted through the negative pressure fan, and the cabinet body can be heated as needed to improve the dehumidification efficiency, thereby ensuring that the switch cabinet body can work normally and stably as much as possible. In summary, the present invention has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0015] Figure 2 It is an enlarged schematic diagram of the local structure of the utility model.

[0016] Figure 3 This is a circuit diagram of the utility model. DETAILED DESCRIPTION

[0017] Figure 1 、 2As shown in , 3, a new type of moisture-proof low-voltage switchgear, including a low-voltage switchgear body 1, a humidity sensor T2, a power switch S, an electric push rod M1, an axial flow negative pressure fan M, and also has a detection circuit 1, a temperature control circuit 2, and a heating and filtering mechanism; the heating and filtering mechanism includes a first solenoid valve DC1, an electric heating plate RT, a filter box 31 (with a non-woven filter installed inside), and a shell 32. A first air intake pipe and a first exhaust pipe that are interconnected with the interior of the shell 31 are respectively welded at the left outer side and the middle of the right outer side. The two electric heating plates RT are respectively installed at the front and rear ends of the shell 32. The right end of the first solenoid valve DC1 and the left side of the first air intake pipe are connected through a pipe joint. The second exhaust pipe in the middle of the right end (the left end is the second air intake pipe) of the filter box 31 and the left end of the first solenoid valve DC1 are connected through a pipe joint; a ventilation pipe is respectively welded at the middle of the lower left side end and the middle of the upper end of the cabinet 102 of the switchgear body. The ventilation pipe at the lower left side end and the first exhaust pipe of the shell are connected through a pipe joint. The pipe joint is connected, and the negative pressure fan M is equipped with a second solenoid valve DC2. The negative pressure fan M is fixedly installed on the outside of the upper end of the cabinet 102 and its air inlet end is connected to the ventilation pipe on the upper right outer side of the cabinet 102 through a pipe joint. The upper end of the exhaust end of the negative pressure fan M is connected to the lower end of the second solenoid valve DC2 through a threaded connection; the cylinder of the electric push rod M1 is longitudinally distributed and fixedly installed in the middle of the right end inside the cabinet 102, and a rectangular hollow rubber sealing gasket 103 is glued to the outside of the front end of the cabinet with glue. A rectangular permanent bar magnet sheet 104 is glued to the four sides of the rear end of the cabinet door 101 of the distribution cabinet body, and the joint between every two magnet sheets 104 is in a sealed structure (the joint is sealed with glue); the humidity sensor T2, the power switch S, the detection circuit 1, and the temperature control circuit 2 are installed on the circuit board in the component box 4. The component box 4 is fixedly installed on the upper front end of the cabinet 102 of the switch cabinet body, and the detection surface of the humidity sensor T2 is located outside the rear end opening of the component box.

[0018] Figure 1 、 2As shown in Figures 3 and 4, the first solenoid valve DC1 and the second solenoid valve DC2 are normally closed valve core solenoid valves. The inner and outer diameters of the four magnet pieces 104 are consistent with the inner and outer diameters of the sealing gasket 103. When the front end of the push column of the electric push rod M is at the rear dead center and the cabinet door 101 is closed, the distance between the rear end of the cabinet door 101 and the front end of the push column is. The detection circuit includes resistors R1 and R2 and an adjustable resistor RP1, a relay J1, and a transistor Q1 connected via circuit board wiring. One end of the adjustable resistor RP1 is connected to one end of the first resistor R1 and one end of the second resistor R2. The other end of the second resistor R2 is connected to the base of transistor 1. The collector of transistor Q1 is connected to the negative power input terminal of relay J1. The positive terminal of relay J1 is connected to the control power input terminal. The other end of the first resistor R1 is connected to the emitter of transistor Q1. The temperature control circuit includes a temperature control switch S1 and a relay J connected via circuit board wiring. The temperature sensing head of the temperature control switch S1 is located outside the second opening at the rear end of the component box 4. One end of the temperature control switch S1 is connected to the positive power input end of the relay J. The temperature control switch S1 is a finished product of a normally open contact temperature detection switch.

[0019] Figure 1 、 2 As shown in Figure 3, the power input terminals 1 and 2 of the power module T1 are connected to the two poles of the AC 220V power supply through wires, the power output terminals 3 and 4 of the power module T1 and the power input terminals 1 and 2 of the temperature sensor T2, the power input terminal of the detection circuit, the positive power input terminal of the relay J1 and the emitter of the transistor Q1, the power input terminal of the temperature control circuit, the other end of the temperature control switch S1 and the negative power input terminal of the relay J1, and the power input terminals 1 and 2 of the power switch S are connected through wires, the signal output terminal 3 of the humidity sensor T2 and the signal input terminal of the detection circuit, the adjustable resistor RP1 are connected separately. One end is connected via a wire. The normally open contact of relay J1, the power output terminal of the detection circuit, is connected to the positive power input terminals of the first solenoid valve DC1, the second solenoid valve DC2, and the negative pressure fan M, as well as the control power input terminal of relay J, the signal input terminal of the temperature control circuit. The normally closed contact of relay J, the power output terminal of the temperature control circuit, is connected to the positive power input terminals of the two electric heating plates RT. Pins 3 and 4, as well as pins 5 and 6 of the power output terminals of the power switch S (the handle is located on the front outer side of the cabinet at the upper end of the cabinet door) are connected to the positive and negative, and negative and positive, power input terminals of the electric push rod M1, respectively, via wires. The negative power output terminal of power module T1 is connected via a wire to the negative power input terminals of the first solenoid valve DC1, the second solenoid valve DC2, the negative pressure fan M, the electric heating plate RT, and relay J.

[0020] Figure 1 、 2As shown in Figures 3 and 4, this novel device, based on a low-voltage distribution cabinet 1, is used for power conversion, distribution, and control. It is primarily designed for use in AC 50Hz, 380V rated voltage distribution systems. By integrating switches, circuit breakers, fuses, buttons, indicator lights, meters, wiring, and other protective components, it implements power distribution, control, metering, and cable connection functions, ensuring a safer and more efficient power supply. After 220V AC power enters the power input of power module T1, pins 3 and 4 of power module T1 output a stable 12V DC power supply that is fed into the power inputs of humidity sensor T2, power switch S, detection circuit, and temperature control circuit. When the door 101 of the low-voltage distribution cabinet 1 is closed, the rear end of the magnet 104 engages the front of the steel metal cabinet 102. Due to the presence of a sealing gasket, the magnet and cabinet front are tightly sealed together, effectively reducing the chance of moist air entering the cabinet through the gap between the door and cabinet front. In actual application, after the staff turns the handle of the power switch S to the left or right, the 1, 2 pins and the 3, 4 pins or the 5, 6 pins of the power switch S are connected respectively, so that the positive and negative or negative and positive power input terminals of the electric push rod M are energized. After the positive and negative power input terminals of the electric push rod M are energized, its push column pushes the rear right end of the cabinet door 102 to move forward (the cabinet door and the cabinet body are separated). In this way, the staff can easily open the cabinet door 101 and prevent the magnet and the front of the cabinet body from being tightly attracted together, which causes inconvenience to the staff in opening the door (relatively large force is required to open the cabinet door); after the negative and positive power input terminals of the electric push rod M are energized, its push column moves toward the rear side end and is separated from the rear right end of the cabinet door 102. In this way, the staff can conveniently close the cabinet door (after turning off the power switch S, the electric push rod loses power).

[0021] Figure 1 、 2As shown in Figure 3, when the humidity inside the distribution cabinet is less than 60%, the voltage signal output by pin 3 of humidity sensor T2 is relatively low. This voltage signal is divided by adjustable resistors RP1 and R1. Resistor R2 reduces the voltage and limits the current, causing the base of transistor Q1 to be below 0.7V. Transistor Q1 will not conduct, and relay J1 will not be energized. Solenoid valves DC1 and DC2, electric heating plate RT, and negative pressure fan will not be powered. When the humidity inside the distribution cabinet is higher than 60%, the voltage signal output by pin 3 of humidity sensor T2 is relatively high. This voltage signal is divided by adjustable resistors RP1 and R1. Resistor R2 reduces the voltage and limits the current, causing the base of transistor Q1 to be above 0.7V. Transistor Q1 will conduct and output a low level to the negative power input terminal of relay J1. Relay J1 is energized, closing its control power input terminal and normally open contact. Then, solenoid valves DC1 and DC2, electric heating plate RT, and negative pressure fan will be powered. When solenoid valves DC1 and DC2 are energized, their valve cores open (the electric heating plate RT is energized to generate heat), and axial fan M is energized to generate negative pressure suction, drawing in external air through solenoid valve DC1. This air is filtered through filter box 31 to remove dust and moisture, and then heated by the electric heating plate RT before entering the distribution cabinet body 1. The air is then discharged through axial fan M and solenoid valve DC2. This relatively dry, heated air enters the distribution cabinet body, heating and discharging the moist air inside the distribution cabinet body 1, quickly reducing the humidity inside the distribution cabinet body. When the humidity inside the distribution cabinet body falls below 60% again, relay J1 de-energizes, and solenoid valves DC1 and DC2, along with the electric heating plate RT and negative pressure fan, no longer energize. (The closed valve cores of solenoid valves DC1 and DC2 prevent moist air or dust from entering the distribution cabinet body.) In practice, when the temperature inside the distribution cabinet 1 exceeds 45°C, the internal contacts of temperature control switch S1 close. This energizes relay J, closing its control power input and normally closed contacts. Consequently, even if the humidity inside the distribution cabinet exceeds the set value and relay J1 energizes, the electric heating plate RT will not be energized and heated. This prevents the high temperature inside the distribution cabinet from causing the electric heating plate RT to heat up, further increasing the temperature inside the distribution cabinet and potentially damaging electrical equipment. (In this mode, the axial fan draws in external air, which circulates and reduces the humidity and temperature inside the distribution cabinet. Consequently, the dehumidification time is generally slightly longer in this mode because no hot air enters.) When the temperature inside the distribution cabinet 1 falls below 45°C, the internal contacts of temperature control switch S1 open, and relay J loses power, no longer energizing its control power input and normally closed contacts. Consequently, if the humidity inside the distribution cabinet subsequently exceeds the set value, the electric heating plate RT will be energized and function normally. The new model ensures that the switch cabinet body can work normally and stably as much as possible. Figure 3In the figure, the power module T1 is a finished product of AC 220V to DC 12V switching power module with an output power of 2KW; the relays J1 and J are DC12V; the transistor Q1 is 9013 (NPN); the solenoid valves DC1 and DC2 are normally closed valve core solenoid valves with a power of 2W; the electric push rod M1 is a finished product of a reciprocating electric telescopic rod with a power of 10W; the resistance values ​​of resistors R1 and R2 are 7K and 4.7K respectively; the resistance value of the adjustable resistor RP1 is 470K (this new model is adjusted to 28K. The larger the resistance value, the greater the partial pressure. When the humidity in the distribution cabinet is higher, the relay J1 will be energized and attracted. On the contrary, the smaller the resistance value, the smaller the partial pressure. When the humidity in the distribution cabinet is lower, the relay J1 will be electrically attracted, and the specific resistance value will be set and adjusted by the production technicians according to the humidity threshold data in the distribution cabinet that needs to be controlled); the humidity sensor T2 is a finished humidity sensor of model CJ2010, which has two power input terminals and one signal output terminal. The higher the detected humidity, the higher the voltage signal output by the signal output terminal, and vice versa; the operating voltage of the axial fan M is 12V DC and the power is 50W; the temperature control switch S1 is a finished product of a snap-type normally open temperature control switch of model KSD301 with a temperature of 45°C; the electric heating plate RT is a finished constant temperature PTC electric heating plate with a power of 200W and a temperature of 50°C (due to the heat absorption of the air, the temperature entering the cabinet will not exceed 45°C). The above electrical components are existing mature technologies, and this application will not elaborate on their working principles.

[0022] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all perspectives, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that come within the meaning and range of equivalents of the claims be included in the present invention.

[0023] In addition, it should be understood that although this specification is described in terms of implementation methods, the implementation methods do not only include an independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A new type of moisture-proof low-voltage switchgear, including a low-voltage switchgear body, a humidity sensor, an electric push rod, and a negative pressure fan, characterized in that: The vents on the filter housing are connected to the air inlet pipe, and the vents on the filter housing are connected to the air inlet pipe. end connection; the electric push rod is installed at one side end of the cabinet, a sealing gasket is installed around the front end of the cabinet, and a magnet is installed at the rear end of the cabinet door of the distribution cabinet body; the humidity sensor, detection circuit, and temperature control circuit are installed in the component box, and the component box is installed in the cabinet; the signal output end of the humidity sensor and the signal input end of the detection circuit are electrically connected, the power output end of the detection circuit and the power input end of the first solenoid valve, the second solenoid valve, the negative pressure fan and the signal input end of the temperature control circuit are electrically connected, and the power output end of the temperature control circuit is electrically connected to the power input end of the electric heating plate.

2. A novel moisture-proof low-voltage switchgear according to claim 1, characterized in that: The first solenoid valve and the second solenoid valve are normally closed valve core solenoid valves.

3. A novel moisture-proof low-voltage switchgear according to claim 1, characterized in that: The inner and outer diameters of the magnet piece are consistent with those of the sealing gasket.

4. A novel moisture-proof low-voltage switchgear according to claim 1, characterized in that: The distance between the rear end of the door and the front end of the push column when the front end of the push column of the electric linear actuator is at the rear stop point and the door is closed.

5. The novel moisture-proof low-voltage switchgear according to claim 1 is characterized in that: The detection circuit includes an electrically connected resistor and an adjustable resistor, a relay, and a transistor. One end of the adjustable resistor is connected to one end of the first resistor and one end of the second resistor. The other end of the second resistor is connected to the base of the transistor. The collector of the transistor is connected to the negative power input end of the relay, the positive pole of the relay is connected to the control power input end, and the other end of the first resistor is connected to the emitter of the transistor.

6. The novel moisture-proof low-voltage switchgear according to claim 1 is characterized in that: The temperature control circuit includes an electrically connected temperature control switch and a relay. One end of the temperature control switch is connected to the positive power input end of the relay. The internal contact type of the temperature control switch is a normally open structure.

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