CN112864929A - Positive pressure type explosion-proof power distribution cabinet and use method thereof - Google Patents
Positive pressure type explosion-proof power distribution cabinet and use method thereof Download PDFInfo
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- CN112864929A CN112864929A CN202110080577.8A CN202110080577A CN112864929A CN 112864929 A CN112864929 A CN 112864929A CN 202110080577 A CN202110080577 A CN 202110080577A CN 112864929 A CN112864929 A CN 112864929A
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- valve
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- sealing
- air inlet
- cabinet body
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/025—Safety arrangements, e.g. in case of excessive pressure or fire due to electrical defect
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/28—Casings; Parts thereof or accessories therefor dustproof, splashproof, drip-proof, waterproof or flameproof
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/30—Cabinet-type casings; Parts thereof or accessories therefor
- H02B1/306—Accessories, e.g. windows
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/30—Cabinet-type casings; Parts thereof or accessories therefor
- H02B1/32—Mounting of devices therein
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/56—Cooling; Ventilation
- H02B1/565—Cooling; Ventilation for cabinets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
- H02B13/045—Details of casing, e.g. gas tightness
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B3/00—Apparatus specially adapted for the manufacture, assembly, or maintenance of boards or switchgear
Abstract
The invention relates to a positive pressure type explosion-proof power distribution cabinet which comprises a cabinet body and a cabinet door, wherein a first air inlet, a second air inlet, a first exhaust port and a second exhaust port are arranged on the cabinet body, a filter screen, an air inlet electromagnetic valve, an air inlet fan, a filter, a dehumidifier and a switching valve are sequentially arranged in the cabinet body at the first air inlet, an air inlet pipe connected with inert gas is arranged at the second air inlet, a control device for controlling the inert gas to enter is arranged on the air inlet pipe, the exhaust electromagnetic valve and a flame arrester are sequentially arranged at the first exhaust port from inside to outside, one side of the cabinet body is movably hinged with the cabinet door, a controller is arranged on the outer side of the cabinet body, and a pressure sensor and a. The invention has the beneficial effects that: when inert gas can not be introduced, the outside dust-containing air can be filtered and dehumidified, and then the inside of the cabinet is introduced for pressurization, so that the cabinet is more flexible and convenient to use, and the working efficiency is effectively improved.
Description
Technical Field
The invention relates to an explosion-proof power distribution cabinet, in particular to a positive pressure type explosion-proof power distribution cabinet and a using method thereof.
Background
With the development of industries such as kerosene chemical industry, metal smelting, chemical pharmacy and the like, the positive pressure type explosion-proof power distribution cabinet is more and more widely used in system control. The positive pressure type explosion-proof power distribution cabinet is generally arranged in a sealing mode, when the positive pressure type explosion-proof power distribution cabinet works in an inflammable and explosive environment, inert gas is filled into the cabinet body, so that the air pressure in the cabinet body is larger than the air pressure outside, the inflammable and explosive mixed gas outside is not prone to entering the cabinet body, and therefore the explosion caused by the contact of electric sparks generated by elements in the cabinet body in working is avoided. Most of the existing positive pressure type explosion-proof power distribution cabinets are operated in dust type inflammable and explosive environments, once dust enters the power distribution cabinet, dust explosion easily occurs in the narrow and small environment in the power distribution cabinet in contact with electric sparks generated when internal elements work, and the existing positive pressure type explosion-proof power distribution cabinet only has one air inlet and one air outlet for inert gas to enter, so that other air inlet modes are lacked, and the air pressure inside the power distribution cabinet in the using process can gradually drop, and gas needs to be supplemented regularly.
If in the course of the work at the switch board, in case it damages to have the gas cylinder of inert gas to use up or which position of air feed, when needing to be changed, just need to cut off the power supply completely with the component in the switch board and just can operate, thereby avoid in the switch board because inside atmospheric pressure is not enough to lead to the outside to contain the air inflow of dust and explode, but so both influenced the working progress, still need consume a large amount of time, come to carry out renewed taking a breath in the switch board, use very inconvenient.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a positive pressure type explosion-proof power distribution cabinet and a using method thereof so as to solve the problems.
The technical scheme of the invention is realized as follows: the utility model provides a positive pressure type explosion-proof power distribution cabinet, includes the cabinet body and cabinet door, be equipped with first air inlet, second air inlet, first exhaust port and second gas vent on the cabinet body, first air inlet is in that the internal filter screen, air inlet solenoid valve, fan, filter, dehumidifier and the diverter valve of being equipped with in proper order of cabinet, second air inlet department is equipped with the intake pipe of connecting inert gas, be equipped with the controlling means who controls inert gas and get into in the intake pipe, first exhaust port department is from interior toward being equipped with exhaust solenoid valve and spark arrester outward in proper order, one side and the cabinet door activity of the cabinet body are articulated, be equipped with the controller on the outside of the cabinet body, internal pressure sensor and the temperature detector of being equipped.
Through adopting above-mentioned technical scheme, when the switch board is in normal use, make its inside atmospheric pressure be greater than outside atmospheric pressure through adopting the mode that the intake pipe lets in inert gas, make difficult entering such as outside flammable and explosive dust. When inert gas cannot be filled, external air can be firstly introduced into the filter for filtering by opening the air inlet electromagnetic valve and the air inlet fan, and impurities such as dust in the air can be effectively filtered; the filtered air is respectively led into the dehumidifier through the first inlet and the second inlet, the temperature of the refrigerating end of the semiconductor refrigerating sheet in the dehumidifier is lower than that of the led-in air, so that water vapor condensation in the air in the dehumidifying cavity is gathered to achieve the dehumidifying effect, water drops can be effectively prevented from being attached to electrical elements in the power distribution cabinet, the short circuit is avoided, the dehumidified dry and cold air is sent into the cabinet body through the first sealing valve to increase the pressure in the cabinet body, the pressure reaches a specified value, external inflammable and explosive dust and the like cannot easily enter, and the power distribution cabinet can be effectively helped to be cooled; in the dehumidification process of the dehumidifier, air is introduced into the heating end of the semiconductor refrigeration sheet to help heat dissipation, and the heated air is discharged out of the cabinet body through the switching valve. The dry and cold air after dehumidification of the dehumidification cavity in the dehumidifier can be guided into the heat dissipation cavity through the air guide hole and then is sent into the switching valve through the first outlet, the switching valve is communicated with the medium inlet and the second medium outlet to guide the air into the cabinet body, so that the heating end of the semiconductor refrigeration sheet can be effectively helped to dissipate heat, the temperature of the dehumidified air can be effectively improved, the temperature in the cabinet body can not be too low in places with low temperature in winter, the situation that some electrical elements cannot be normally used due to too low temperature is avoided, selection can be carried out according to actual conditions, and the use is more convenient and simple; can let in the cabinet internal pressure boost after can't letting in dusty filtration, the dehumidification of outside when unable letting in inert gas, make its use more nimble, convenient, can continue to use inert gas to inflate after inert gas's partial maintenance is accomplished, need not to cut off the power supply to the switch board during, effectual work efficiency that has improved.
The invention is further configured to: the filter comprises a filter shell, a dust collecting barrel, a sleeve, a guide pipe and a filter piece, wherein the side wall of the filter shell is provided with a dust removing air inlet, the top end of the filter shell is provided with a dust removal air outlet, the lower end of the filter shell is designed to be a cone shape, the dust collecting cylinder is movably connected to the lower end of the filter shell, the upper end of the sleeve is fixedly connected to the top end of the inner wall of the filter shell, the lower end of the sleeve is sleeved outside the guide pipe, an air guide channel is arranged in a gap between the lower end of the sleeve and the outer wall of the guide pipe, the lower end of the sleeve is fixedly connected with the guide pipe through a plurality of connecting rods, the lower end of the guide pipe extends into the dust collecting cylinder, it fixes in the cover and sets up with telescopic inner wall clearance to filter a piece, filter the lower extreme of piece and extend to in the stand pipe, filter and establish to the tube-shape, filter the opening part and the gas outlet that removes dust of piece and be connected.
By adopting the technical scheme, the dust-containing gas enters the filter shell through the dust-removing gas inlet to rotate along the inner wall of the filter shell, part of dust falls into the dust-collecting cylinder to be collected in the rotating process, the rest gas enters the sleeve through the gas guide channel and is filtered by the filtering piece, the clean air filtered by the filtering piece is discharged through the dust-removing gas outlet, and the dust on the surface of the filtering piece falls into the dust-collecting cylinder; the dust-containing gas is pretreated by rotating before the dust removal of the filter element, so that the dust attached to the surface of the filter element is less, and the dust removal effect is better.
The invention is further configured to: the bus direction of the dust removal air inlet is coincided with the tangential direction of the side wall of the filter shell, and the outer wall of the lower end of the filter shell is connected with the inner wall of the upper end of the dust collection cylinder through threads.
By adopting the technical scheme, the air entering the dust removal air inlet can rotate along the inner wall of the filter, so that the flow speed of the rotating airflow is faster, and the filtering effect is better; the filter shell and the dust collecting cylinder which are connected through the threads enable the dust collecting cylinder to be more convenient to disassemble and assemble, and the dust collecting cylinder is easier to clean.
The invention is further configured to: the dehumidifier comprises a dehumidifier shell, a semiconductor refrigeration sheet, a first sealing valve, a second sealing valve and a third sealing valve, wherein a dehumidification cavity and a heat dissipation cavity are separated by a vertically arranged partition plate in the dehumidification shell, the semiconductor refrigeration sheet is arranged on the partition plate, a refrigeration end and a heating end of the semiconductor refrigeration sheet are respectively arranged in the dehumidification cavity and the heat dissipation cavity, a refrigeration end and a heating end of the semiconductor refrigeration sheet are respectively provided with a cold heat conducting sheet and a heat conducting sheet, a bottom end in the dehumidifier shell is provided with a water storage cavity, a top end of the dehumidifier shell is provided with a first inlet and a first outlet which are respectively communicated with the dehumidification cavity and the heat dissipation cavity, lower sides of the dehumidification cavity and the heat dissipation cavity are respectively provided with a second outlet and a second inlet which are communicated with the outside, the partition plate is provided with a gas guide hole communicated with the dehumidification cavity and the heat dissipation cavity, the second outlet is formed in the dehumidification cavity and the heat dissipation, The second inlet and the air guide hole are both arranged below the semiconductor refrigerating sheet, the first sealing valve is arranged in the second outlet, the second sealing valve is arranged in the air guide hole, and the third sealing valve is arranged in the second inlet.
By adopting the technical scheme, filtered air enters the dehumidification cavity through the first inlet, the air guide hole is closed, the air is cooled through the cold temperature conduction sheet connected with the refrigeration end of the semiconductor refrigeration sheet, so that water vapor in the air is condensed on the cold temperature conduction sheet for dehumidification, water drops drop in the water storage cavity for collection, and the dehumidified dry and cold air enters the cabinet body through the second outlet for pressurization; meanwhile, filtered air enters the heat dissipation cavity through the second inlet to help the heat conduction temperature sheet connected with the heating end of the semiconductor refrigerating sheet to dissipate heat, so that the refrigerating effect of the refrigerating end of the semiconductor refrigerating sheet is better; the second outlet and the first inlet can be sealed, the air guide hole is opened again to guide the dehumidified dry and cold air into the heat dissipation cavity to heat the dry and cold air, and then the dry and warm air is guided into the cabinet body through the switching valve to pressurize the cabinet body, so that the internal temperature of the cabinet body is not too low.
The invention is further configured to: the first sealing valve, the second sealing valve and the third sealing valve are of the same structure, the third sealing valve comprises a base, a sealing plate, a connecting sleeve, a fixing plate, a fixing shaft, a driving motor and a spring, the outer side wall of the base is fixed on the inner wall of the second inlet in a sealing manner, a rotating groove is formed in the base, a first through hole matched with the sealing plate is formed in the groove bottom of the rotating groove, the sealing plate is tightly attached to the groove bottom of the rotating groove to rotate, a square shaft in a rectangular arrangement is arranged on one side, away from the first through hole, of the sealing plate, a connecting groove which corresponds to the square shaft and is in sliding connection with the square shaft is formed in the connecting sleeve, the fixing plate is fixedly connected to the inner wall of the second inlet through the fixing shaft, the driving motor is fixed on the fixing plate, the, and a spring sleeved outside the connecting sleeve is arranged between the support ring and the sealing plate.
By adopting the technical scheme, the sealing plate is matched with the first through hole, and the square shaft is driven to rotate by the driving motor, so that the sealing plate covers or opens the first through hole, the opening and closing effect is achieved, the opening and closing are quicker, and the structure is simple; the spring can be with the inseparable pressure of closing plate on first through-hole, makes its sealed effect better.
The invention is further configured to: the groove wall of the rotating groove is provided with a sealing groove for the edge of the sealing plate to be rotatably connected, a first sealing ring is arranged in the sealing groove, and the first sealing ring is connected with one side, far away from the connecting sleeve, of the sealing plate.
Through adopting above-mentioned technical scheme, the effectual leakproofness that has improved between closing plate and the seal groove of first sealing washer makes its sealed effect better, more stable.
The invention is further configured to: the switching valve comprises a valve body, and a shaft sleeve, a valve rod and a valve clack which are arranged in the valve body, wherein one end of the valve body is provided with a valve cavity, the side wall of the valve body is provided with a medium inlet, a first medium outlet and a second medium outlet which are communicated with the valve cavity, the shaft sleeve is tightly matched and connected with the inner wall of the opening of the valve cavity, one end of the shaft sleeve, which is far away from the opening of the valve cavity, is provided with a medium channel communicated with the valve cavity, the side wall of the shaft sleeve is provided with a plurality of second through holes communicated with the medium channel and the second medium outlet, the valve clack is fixedly connected with one end of the valve rod, the other end of the valve rod sequentially penetrates through the medium channel and the shaft sleeve to be connected with an output shaft of an external push rod motor, the front end and the rear end of the valve, the two separation blades are respectively arranged at the front end and the rear end of the valve clack, the separation blade at the front end of the valve clack is matched with an inner cavity of the first medium outlet, the separation blade at the rear end of the valve clack is matched with an inner cavity of the medium channel, a plurality of second sealing rings are arranged between the outer wall of the shaft sleeve and the inner wall of the valve cavity, and Y-shaped sealing rings are arranged between the valve rod and the shaft sleeve.
By adopting the technical scheme, the medium inlet is communicated with the first medium outlet and the second medium outlet, and the valve rod is driven by the push rod motor to move transversely to seal the first medium outlet or the second medium outlet, so that the effect of switching the passage is achieved; the baffle plate can effectively avoid instant communication of the gas circuit, and the switching of the gas circuit is more reliable; the Y-shaped sealing ring effectively improves the sealing performance between the valve rod and the shaft sleeve when the valve rod contracts.
The invention is further configured to: the dust removal air outlet of the filter is respectively communicated with a first inlet and a second inlet of the dehumidifier through a first air duct, a second outlet of the dehumidifier is communicated with the inside of the cabinet body, the first outlet of the dehumidifier is connected with a medium inlet of the switching valve through a second air duct, a first medium outlet of the switching valve is communicated with a second air outlet, a one-way valve which can only exhaust outwards is arranged in the second air outlet, and a second medium outlet of the switching valve is communicated with the inside of the cabinet body.
Through adopting above-mentioned technical scheme, the air after the filter filters is through first air duct leading-in simultaneously to the dehumidifier in first entry and the second entry, the drying air after the heating of dehumidifier passes through the leading-in medium entrance to the diverter valve of second air duct in, the check valve of second air vent department can only allow gas to exhaust from the outer cabinet body of second gas vent, and outside gas can't enter into the second air vent in, can effectually avoid outside dust to enter into the cabinet body.
The invention is further configured to: the air inlet electromagnetic valve, the air inlet fan, the semiconductor refrigeration piece, the driving motor, the push rod motor, the control device, the exhaust electromagnetic valve, the pressure sensor and the temperature detector are all electrically connected with the controller.
By adopting the technical scheme, the automatic control can be carried out through the controller, different actions can be carried out according to different conditions, the use is more convenient and easier, and the workload of workers is reduced.
A using method of a positive pressure type explosion-proof power distribution cabinet comprises the following steps:
s1: when the second air inlet admits air, if the pressure sensor detects that the pressure value in the cabinet body is smaller than X, the controller closes the air inlet electromagnetic valve, the air inlet fan, the exhaust electromagnetic valve and the first sealing valve, drives a push rod motor of the switching valve to pull back the valve rod to seal the second medium outlet, and starts the control device to be filled with inert gas until the pressure value is larger than X;
s2: when the first air inlet admits air, the controller controls the control device to stop charging inert gas, if the pressure sensor detects that the pressure value in the cabinet body is smaller than X, the exhaust electromagnetic valve and the second sealing valve are closed, the air inlet electromagnetic valve, the air inlet fan, the semiconductor refrigeration sheet, the first sealing valve and the third sealing valve are opened, and the push rod motor of the switching valve is driven to pull back the valve rod to seal the second medium outlet;
s3: external air is sucked by the air inlet fan, enters the filter through the filter screen, the air inlet electromagnetic valve and the air inlet fan in sequence and is filtered, the filtered air enters the dehumidification cavity of the dehumidifier from the first inlet through the first air duct for cooling and dehumidification, the dehumidified dry cold air enters the cabinet body through the first sealing valve, and moisture on the cold-conducting temperature sheet is gathered and dropped in the water storage cavity for collection;
s4: meanwhile, filtered air enters a heat dissipation cavity of the dehumidifier through a first air duct by a third sealing valve to help a heat conducting temperature sheet of a semiconductor refrigeration sheet to dissipate heat, and heated hot air enters a valve cavity of the switching valve through a first outlet and a second air duct and is discharged out of the cabinet body through a first medium outlet and a second air outlet;
s5: when the pressure sensor detects that the pressure value in the cabinet body reaches X, the pressure sensor sends a signal to the controller, the controller controls the air inlet electromagnetic valve, the air inlet fan, the semiconductor refrigeration sheet and the first sealing valve to be closed, the air charging is stopped, and the switching valve keeps the sealing state of the second medium outlet;
s6: when the pressure sensor detects that the pressure value in the cabinet body exceeds Y, Y is larger than X, the exhaust electromagnetic valve is opened until the pressure value is smaller than Y, and then the exhaust electromagnetic valve is closed;
s7: when the temperature detector detects that the temperature in the cabinet body is lower than Z and the pressure value in the cabinet body is smaller than Y, the controller controls the air inlet electromagnetic valve, the air inlet fan, the semiconductor refrigeration sheet and the second sealing valve to be opened, the first sealing valve and the third sealing valve are closed, and the push rod motor of the switching valve pushes the valve rod to seal the first medium outlet;
s8: outside air is sucked through the air inlet fan, enters the filter through the filter screen, the air inlet electromagnetic valve and the air inlet fan in sequence and is filtered, the filtered air enters the dehumidification cavity of the dehumidifier through the first air duct from the first inlet to be cooled and dehumidified, then enters the heat dissipation cavity to be heated through the second sealing valve, the heated dry warm air enters the valve cavity of the switching valve through the first outlet and the second air duct, and is discharged into the cabinet body through the second medium outlet of the switching valve.
By adopting the technical scheme, when the inert gas inlet device is normal, the inert gas can be filled through the gas inlet pipe to pressurize; when the air inlet device of the inert gas has a problem and can not be used for air inlet, the air inlet electromagnetic valve and the air inlet fan can be opened to guide external dust-containing gas into the filter for filtering, the filtered gas is respectively and simultaneously guided into the dehumidification cavity and the heat dissipation cavity in the dehumidifier, the dehumidification cavity dehumidifies the gas, the air flowing in the heat dissipation cavity helps the heating end of the semiconductor refrigeration sheet to dissipate heat, so that the refrigeration effect of the heating end is better, the heated air is discharged out of the cabinet body through the switching valve, and the dehumidified dry and cold air is introduced into the cabinet body for pressurization; when the air pressure in the cabinet body is too high, the exhaust is performed by opening the exhaust electromagnetic valve; when the temperature in the cabinet body is too low, dry and cold air dehumidified in the dehumidifier can be guided into the heat dissipation cavity through the second sealing valve to be heated, and the heated air is discharged into the cabinet body through the switching valve, so that the problem that some electric elements cannot work normally due to the fact that the temperature in the cabinet body is too low can be well prevented; the air conditioner can be introduced with dry and cold air and dry and warm air, and can be selected according to different conditions, so that the air conditioner is more convenient to use; can let in the cabinet internal pressure boost after can't letting in dusty filtration, the dehumidification of outside when unable letting in inert gas, make its use more nimble, convenient, can continue to use inert gas to inflate after inert gas's partial maintenance is accomplished, need not to cut off the power supply to the switch board during, effectual work efficiency that has improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a filter according to an embodiment of the present invention.
Fig. 3 is a structural sectional view of a-a in fig. 2 according to an embodiment of the present invention.
Fig. 4 is a schematic structural view of a dehumidifier according to an embodiment of the present invention.
FIG. 5 is a schematic diagram of A according to an embodiment of the present invention.
Fig. 6 is a schematic structural view of a sealing plate and a first through hole of a third sealing valve according to an embodiment of the present invention.
Fig. 7 is a schematic structural diagram of a switching valve according to an embodiment of the present invention.
Fig. 8 is a structural sectional view of a cabinet body and a cabinet door in the embodiment of the invention.
FIG. 9 is a schematic diagram of a structure B according to an embodiment of the present invention.
FIG. 10 is a flow chart of a method of use in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-10, the invention discloses a positive pressure type explosion-proof power distribution cabinet, which comprises a cabinet body 1 and a cabinet door 2, wherein the cabinet body 1 is provided with a first air inlet 3, a second air inlet 4, a first exhaust port 5 and a second exhaust port 6, the first air inlet 3 is positioned in the cabinet body 1 and is sequentially provided with a filter screen 8, an air inlet electromagnetic valve 9, an air inlet fan 10, a filter 11, a dehumidifier 12 and a switching valve 13, the second air inlet 4 is provided with an air inlet pipe 7 connected with inert gas, the air inlet pipe 7 is provided with a control device 21 for controlling the inert gas to enter, the first exhaust port 5 is sequentially provided with an exhaust electromagnetic valve 14 and a flame arrester 15 from inside to outside, one side of the cabinet body 1 is movably hinged with the cabinet door 2, the outer side of the cabinet body 1 is provided with a controller 16, and the cabinet body 1.
Through adopting above-mentioned technical scheme, when the switch board is in normal use, make its inside atmospheric pressure be greater than outside atmospheric pressure through adopting the mode that the intake pipe lets in inert gas, make difficult entering such as outside flammable and explosive dust. When inert gas cannot be filled, external air can be firstly introduced into the filter for filtering by opening the air inlet electromagnetic valve and the air inlet fan, and impurities such as dust in the air can be effectively filtered; the filtered air is respectively led into the dehumidifier through the first inlet and the second inlet, the temperature of the refrigerating end of the semiconductor refrigerating sheet in the dehumidifier is lower than that of the led-in air, so that water vapor condensation in the air in the dehumidifying cavity is gathered to achieve the dehumidifying effect, water drops can be effectively prevented from being attached to electrical elements in the power distribution cabinet, the short circuit is avoided, the dehumidified dry and cold air is sent into the cabinet body through the first sealing valve to increase the pressure in the cabinet body, the pressure reaches a specified value, external inflammable and explosive dust and the like cannot easily enter, and the power distribution cabinet can be effectively helped to be cooled; in the dehumidification process of the dehumidifier, air is introduced into the heating end of the semiconductor refrigeration sheet to help heat dissipation, and the heated air is discharged out of the cabinet body through the switching valve. The dry and cold air after dehumidification of the dehumidification cavity in the dehumidifier can be guided into the heat dissipation cavity through the air guide hole and then is sent into the switching valve through the first outlet, the switching valve is communicated with the medium inlet and the second medium outlet to guide the air into the cabinet body, so that the heating end of the semiconductor refrigeration sheet can be effectively helped to dissipate heat, the temperature of the dehumidified air can be effectively improved, the temperature in the cabinet body can not be too low in places with low temperature in winter, the situation that some electrical elements cannot be normally used due to too low temperature is avoided, selection can be carried out according to actual conditions, and the use is more convenient and simple; can let in the cabinet internal pressure boost after can't letting in dusty filtration, the dehumidification of outside when unable letting in inert gas, make its use more nimble, convenient, can continue to use inert gas to inflate after inert gas's partial maintenance is accomplished, need not to cut off the power supply to the switch board during, effectual work efficiency that has improved.
In the embodiment of the present invention, the filter 11 includes a filter housing 110, a dust collecting cylinder 111, a sleeve 112, a guide tube 113 and a filtering element 114, a dust removing air inlet 1100 is disposed on a side wall of the filter housing 110, a dust removing air outlet 1101 is disposed on a top end of the filter housing 110, a lower end of the filter housing 110 is in a cone shape, the dust collecting cylinder 111 is movably connected to a lower end of the filter housing 110, an upper end of the sleeve 112 is fixedly connected to a top end of an inner wall of the filter housing 110, a lower end of the sleeve 112 is sleeved outside the guide tube 113 and provided with an air guide channel 115 in a gap with an outer wall of the guide tube 113, a lower end of the sleeve 112 is fixedly connected to the guide tube 113 through a plurality of connecting rods 116, a lower end of the guide tube 113 extends into the dust collecting cylinder 111, the filtering element 114 is fixed in, the lower end of the filter element 114 extends into the guide pipe 113, the filter element 114 is cylindrical, and the opening of the filter element 114 is connected with the dust removal air outlet 1101.
By adopting the technical scheme, the dust-containing gas enters the filter shell through the dust-removing gas inlet to rotate along the inner wall of the filter shell, part of dust falls into the dust-collecting cylinder to be collected in the rotating process, the rest gas enters the sleeve through the gas guide channel and is filtered by the filtering piece, the clean air filtered by the filtering piece is discharged through the dust-removing gas outlet, and the dust on the surface of the filtering piece falls into the dust-collecting cylinder; the dust-containing gas is pretreated by rotating before the dust removal of the filter element, so that the dust attached to the surface of the filter element is less, and the dust removal effect is better.
In the embodiment of the present invention, a generatrix direction of the dust-removing air inlet 1100 coincides with a tangential direction of a side wall of the filter housing 110, and an outer wall of a lower end of the filter housing 110 is connected to an inner wall of an upper end of the dust collecting cylinder 111 by a screw thread.
By adopting the technical scheme, the air entering the dust removal air inlet can rotate along the inner wall of the filter, so that the flow speed of the rotating airflow is faster, and the filtering effect is better; the filter shell and the dust collecting cylinder which are connected through the threads enable the dust collecting cylinder to be more convenient to disassemble and assemble, and the dust collecting cylinder is easier to clean.
In the embodiment of the present invention, the dehumidifier 12 includes a dehumidifier shell 120, a semiconductor refrigeration sheet 121, a first sealing valve 122, a second sealing valve 123 and a third sealing valve 124, the dehumidification cavity 1201 and the heat dissipation cavity 1202 are separated from the dehumidification shell 120 by a partition 1200 vertically disposed, the semiconductor refrigeration sheet 121 is disposed on the partition 1200, the refrigeration end and the heating end of the semiconductor refrigeration sheet 121 are respectively disposed in the dehumidification cavity 1201 and the heat dissipation cavity 1202, the refrigeration end and the heating end of the semiconductor refrigeration sheet 121 are respectively provided with a thermal conduction sheet 125 and a thermal conduction sheet 126, the bottom end in the dehumidifier shell 120 is provided with a water storage cavity 1203, the top end of the dehumidifier shell 120 is provided with a first inlet 1204 and a first outlet 1205 respectively communicated with the dehumidification cavity 1201 and the heat dissipation cavity 1202, the lower sides of the dehumidification cavity 1201 and the heat dissipation cavity 1202 are respectively provided with a second outlet 1206 and a second inlet 1207 communicated with the outside, the partition 1200 is provided with an air vent 1208 for communicating the dehumidification chamber 1201 with the heat dissipation chamber 1202, the second outlet 1206, the second inlet 1207 and the air vent 1208 are all arranged below the semiconductor refrigeration sheet 121, the first sealing valve 122 is arranged in the second outlet 1206, the second sealing valve 123 is arranged in the air vent 1208, and the third sealing valve 124 is arranged in the second inlet 1207.
By adopting the technical scheme, filtered air enters the dehumidification cavity through the first inlet, the air guide hole is closed, the air is cooled through the cold temperature conduction sheet connected with the refrigeration end of the semiconductor refrigeration sheet, so that water vapor in the air is condensed on the cold temperature conduction sheet for dehumidification, water drops drop in the water storage cavity for collection, and the dehumidified dry and cold air enters the cabinet body through the second outlet for pressurization; meanwhile, filtered air enters the heat dissipation cavity through the second inlet to help the heat conduction temperature sheet connected with the heating end of the semiconductor refrigerating sheet to dissipate heat, so that the refrigerating effect of the refrigerating end of the semiconductor refrigerating sheet is better; the second outlet and the first inlet can be sealed, the air guide hole is opened again to guide the dehumidified dry and cold air into the heat dissipation cavity to heat the dry and cold air, and then the dry and warm air is guided into the cabinet body through the switching valve to pressurize the cabinet body, so that the internal temperature of the cabinet body is not too low.
In the embodiment of the present invention, the first sealing valve 122, the second sealing valve 123 and the third sealing valve 124 have the same structure, the third sealing valve 124 includes a base 1240, a sealing plate 1241, a connecting sleeve 1242, a fixing plate 1243, a fixing shaft 1244, a driving motor 1245 and a spring 1246, the outer sidewall of the base 1240 is hermetically fixed on the inner wall of the second inlet 1207, the base 1240 is provided with a rotating slot 12400, the bottom of the rotating slot 12400 is provided with a first through hole 12401 matching with the sealing plate 1241, the sealing plate 1241 is tightly attached to the bottom of the rotating slot 12400 and rotates, one side of the sealing plate 1241 away from the first through hole 12401 is provided with a rectangular square shaft 1247, the connecting sleeve 1242 is provided with a connecting slot 12420 corresponding to and slidably connected to the square shaft 1247, the fixing plate 1243 is fixedly connected to the inner wall of the second inlet 1207 by the fixing shaft 1244, the driving motor 1245 is fixed on the fixing plate 124, an output shaft of the driving motor 1245 penetrates through the fixing plate 1243 to be connected with the connecting sleeve 1242, a support ring 12421 is arranged on the outer wall of the connecting sleeve 1242, and a spring 1246 sleeved outside the connecting sleeve 1242 is arranged between the support ring 12421 and the sealing plate 1241.
By adopting the technical scheme, the sealing plate is matched with the first through hole, and the square shaft is driven to rotate by the driving motor, so that the sealing plate covers or opens the first through hole, the opening and closing effect is achieved, the opening and closing are quicker, and the structure is simple; the spring can be with the inseparable pressure of closing plate on first through-hole, makes its sealed effect better.
In the embodiment of the present invention, a groove wall of the rotating groove 12400 is provided with a sealing groove 12402 for rotationally connecting an edge of the sealing plate 1241, a first sealing ring 1248 is arranged in the sealing groove 12402, and the first sealing ring 1248 is connected to a side of the sealing plate 1241 away from the connecting sleeve 1242.
Through adopting above-mentioned technical scheme, the effectual leakproofness that has improved between closing plate and the seal groove of first sealing washer makes its sealed effect better, more stable.
In the embodiment of the present invention, the switching valve 13 includes a valve body 130, a shaft sleeve 131, a valve rod 132, and a valve flap 133 disposed in the valve body 130, wherein a valve cavity 135 is disposed at one end of the valve body 130, a medium inlet 1300, a first medium outlet 1301, and a second medium outlet 1302 which are communicated with the valve cavity 135 are disposed on a side wall of the valve body 130, the shaft sleeve 131 is tightly connected to an inner wall of an opening of the valve cavity 135, a medium passage 1310 communicated with the valve cavity 135 is disposed at an end of the shaft sleeve 131 which is far from the opening of the valve cavity 135, a plurality of second through holes 1311 communicated with the medium passage 1310 and the second medium outlet 1302 are disposed on a side wall of the shaft sleeve 131, the valve flap 133 is fixedly connected to one end of the valve rod 132, the other end of the valve rod 132 sequentially passes through the medium passage 1310 and the shaft sleeve 131 to be connected to an output shaft, the sealing sheets 1330 on the two ends of the valve clack 133 are respectively matched and sealed with the first medium outlet 1301 and the medium passage 1310, the valve rod 132 is sleeved with two blocking sheets 1320, the two blocking sheets 1320 are respectively arranged at the front end and the rear end of the valve clack 133, the blocking sheet 1320 at the front end of the valve clack 133 is matched with the inner cavity of the first medium outlet 1301, the blocking sheet 1320 at the rear end of the valve clack 133 is matched with the inner cavity of the medium passage 1310, a plurality of second sealing rings 136 are arranged between the outer wall of the shaft sleeve 131 and the inner wall of the valve cavity 135, and a Y-shaped sealing ring 137 is arranged between the valve rod 132 and the.
By adopting the technical scheme, the medium inlet is communicated with the first medium outlet and the second medium outlet, and the valve rod is driven by the push rod motor to move transversely to seal the first medium outlet or the second medium outlet, so that the effect of switching the passage is achieved; the baffle plate can effectively avoid instant communication of the gas circuit, and the switching of the gas circuit is more reliable; the Y-shaped sealing ring effectively improves the sealing performance between the valve rod and the shaft sleeve when the valve rod contracts.
In the embodiment of the invention, the cabinet body 1 is provided with an inner frame 200 connected with the cabinet door 2, the inner frame 200 is provided with a mounting groove 201, a hollow sealing element 202 is arranged in the mounting groove 201, an opening is arranged on one side of the sealing element 202 facing the bottom of the mounting groove 201, the sealing element 202 is arranged to protrude from the mounting groove 201, an interference groove 203 corresponding to the part of the sealing member 202 protruding from the mounting groove 201 is formed on the outer edge of the cabinet door 2, pressing strips 204 are respectively arranged on two sides of the inner wall of the sealing element 202, the pressing strips 204 and the sealing element 202 are fixed on the side wall of the mounting groove 201 through screws 205, limiting strips 206 are respectively arranged on the opposite sides of the lower ends of the two pressing strips 204, the cross section of the lower side of the limiting strips 206 is arranged in a circular arc shape, the lower end surfaces of the two limiting strips 206 are positioned on the same horizontal plane, the cabinet body 1 is provided with a guide hole 207 for communicating the inside of the cabinet body 1 with the opening of the sealing element 202.
By adopting the technical scheme, air in the cabinet body can enter the sealing element through the guide hole, and the sealing element can be abutted against the abutting groove of the cabinet door by high air pressure in the cabinet body, so that the sealing element is tightly attached to the cabinet door, and the sealing property between the cabinet body and the cabinet door can be effectively improved; spacing strip makes the cabinet door when opening and close, supports and protects the sealing member, avoids the sealing member to damage increase of service life.
In the embodiment of the present invention, the dust-removing air outlet 1101 of the filter 11 is respectively communicated with the first inlet 1204 and the second inlet 1207 of the dehumidifier 12 through the first air duct 19, the second outlet 1206 of the dehumidifier 12 is communicated with the inside of the cabinet 1, the first outlet 1205 of the dehumidifier 12 is connected with the medium inlet 1300 of the switching valve 13 through the second air duct 20, the first medium outlet 1301 of the switching valve 13 is communicated with the second air outlet 6, the second air outlet 6 is internally provided with the one-way valve 22 which can only exhaust air outwards, and the second medium outlet 1302 of the switching valve 13 is communicated with the inside of the cabinet 1.
Through adopting above-mentioned technical scheme, the air after the filter filters is through first air duct leading-in simultaneously to the dehumidifier in first entry and the second entry, the drying air after the heating of dehumidifier passes through the leading-in medium entrance to the diverter valve of second air duct in, the check valve of second air vent department can only allow gas to exhaust from the outer cabinet body of second gas vent, and outside gas can't enter into the second air vent in, can effectually avoid outside dust to enter into the cabinet body.
In the embodiment of the present invention, the air intake solenoid valve 9, the air intake fan 10, the semiconductor cooling plate 121, the driving motor 1245, the push rod motor 134, the control device 21, the air exhaust solenoid valve 14, the pressure sensor 17, and the temperature detector 18 are all electrically connected to the controller 16.
By adopting the technical scheme, the automatic control can be carried out through the controller, different actions can be carried out according to different conditions, the use is more convenient and easier, and the workload of workers is reduced.
A using method of a positive pressure type explosion-proof power distribution cabinet comprises the following steps:
s1: when the second air inlet is used for air intake, if the pressure sensor 17 detects that the pressure value in the cabinet 1 is smaller than X, the controller 16 closes the air intake solenoid valve 9, the air intake fan 10, the air exhaust solenoid valve 14 and the first sealing valve 122, drives the push rod motor 134 of the switching valve 13 to pull back the valve rod 132 to seal the second medium outlet 1302, and starts the control device 21 to fill the inert gas until the pressure value is larger than X;
s2: when the first air inlet is used for air intake, the controller 16 controls the control device 21 to stop filling the inert gas, if the pressure sensor 17 detects that the pressure value in the cabinet 1 is smaller than X, the exhaust solenoid valve 14 and the second sealing valve 123 are closed, the air intake solenoid valve 9, the air intake fan 10, the semiconductor refrigeration sheet 121, the first sealing valve 122 and the third sealing valve 124 are opened, and the push rod motor 134 of the switching valve 13 is driven to pull back the valve rod 132 to seal the second medium outlet 1302;
s3: external air is sucked by the air inlet fan 10, enters the filter 11 through the filter screen 8, the air inlet electromagnetic valve 9 and the air inlet fan 10 in sequence for filtering, enters the dehumidification cavity 1201 of the dehumidifier 12 from the first inlet 1204 through the first air duct 19 for cooling and dehumidification, the dehumidified dry cold air enters the cabinet body 1 through the first sealing valve 122, and moisture on the cold temperature-conducting sheet 125 is gathered and dropped into the water storage cavity 1203 for collection;
s4: meanwhile, filtered air enters the heat dissipation cavity 1202 of the dehumidifier 12 through the third sealing valve 124 through the first air duct 19 to help the heat conducting and temperature regulating plate 126 of the semiconductor chilling plate 121 dissipate heat, and heated hot air enters the valve cavity 135 of the switching valve 13 through the first outlet 1205 and the second air duct 20 and is then discharged out of the cabinet 1 through the first medium outlet 1301 and the second air outlet 6;
s5: when the pressure sensor 17 detects that the pressure value in the cabinet 1 reaches X, the pressure sensor 17 sends a signal to the controller 16, the controller 16 controls the air inlet electromagnetic valve 9, the air inlet fan 10, the semiconductor refrigeration sheet 121 and the first sealing valve 122 to be closed, the inflation is stopped, and the switching valve 13 maintains the sealed state of the second medium outlet 1302;
s6: when the pressure sensor 17 detects that the pressure value in the cabinet body 1 exceeds Y, Y is larger than X, the exhaust electromagnetic valve 14 is opened until the pressure value is smaller than Y, and then the exhaust electromagnetic valve 14 is closed;
s7: when the temperature detector 18 detects that the temperature in the cabinet 1 is lower than Z and the pressure value in the cabinet 1 is lower than Y, the controller 16 controls the air intake solenoid valve 9, the air intake fan 10, the semiconductor refrigeration sheet 121 and the second sealing valve 123 to be opened, the first sealing valve 122 and the third sealing valve 124 to be closed, and the push rod motor 134 of the switching valve 13 pushes the valve rod 132 to seal the first medium outlet 1301;
s8: the outside air is sucked by the air inlet fan 10, enters the filter 11 through the filter screen 8, the air inlet electromagnetic valve 9 and the air inlet fan 10 in sequence for filtering, enters the dehumidification cavity 1201 of the dehumidifier 12 from the first inlet 1204 through the first air duct 19 for cooling and dehumidification, then enters the heat dissipation cavity 1202 through the second sealing valve 123 for heating, and the heated dry warm air enters the valve cavity 135 of the switching valve 13 through the first outlet 1205 and the second air duct 20 and is discharged into the cabinet body 1 through the second medium outlet 1302 of the switching valve 13.
By adopting the technical scheme, when the inert gas inlet device is normal, the inert gas can be filled through the gas inlet pipe to pressurize; when the air inlet device of the inert gas has a problem and can not be used for air inlet, the air inlet electromagnetic valve and the air inlet fan can be opened to guide external dust-containing gas into the filter for filtering, the filtered gas is respectively and simultaneously guided into the dehumidification cavity and the heat dissipation cavity in the dehumidifier, the dehumidification cavity dehumidifies the gas, the air flowing in the heat dissipation cavity helps the heating end of the semiconductor refrigeration sheet to dissipate heat, so that the refrigeration effect of the heating end is better, the heated air is discharged out of the cabinet body through the switching valve, and the dehumidified dry and cold air is introduced into the cabinet body for pressurization; when the air pressure in the cabinet body is too high, the exhaust is performed by opening the exhaust electromagnetic valve; when the temperature in the cabinet body is too low, dry and cold air dehumidified in the dehumidifier can be guided into the heat dissipation cavity through the second sealing valve to be heated, and the heated air is discharged into the cabinet body through the switching valve, so that the problem that some electric elements cannot work normally due to the fact that the temperature in the cabinet body is too low can be well prevented; the air conditioner can be introduced with dry and cold air and dry and warm air, and can be selected according to different conditions, so that the air conditioner is more convenient to use; can let in the cabinet internal pressure boost after can't letting in dusty filtration, the dehumidification of outside when unable letting in inert gas, make its use more nimble, convenient, can continue to use inert gas to inflate after inert gas's partial maintenance is accomplished, need not to cut off the power supply to the switch board during, effectual work efficiency that has improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides an explosion-proof switch board of positive pressure type, includes the cabinet body (1) and cabinet door (2), its characterized in that: a first air inlet (3), a second air inlet (4), a first exhaust port (5) and a second exhaust port (6) are arranged on the cabinet body (1), a filter screen (8), an air inlet electromagnetic valve (9), an air inlet fan (10), a filter (11), a dehumidifier (12) and a switching valve (13) are sequentially arranged in the cabinet body (1) at the first air inlet (3), an air inlet pipe (7) connected with inert gas is arranged at the second air inlet (4), the air inlet pipe (7) is provided with a control device (21) for controlling the inert gas to enter, an exhaust electromagnetic valve (14) and a flame arrester (15) are sequentially arranged at the first exhaust port (5) from inside to outside, one side of the cabinet body (1) is movably hinged with the cabinet door (2), a controller (16) is arranged on the outer side of the cabinet body (1), a pressure sensor (17) and a temperature detector (18) are arranged in the cabinet body (1).
2. The explosion-proof switch board of positive pressure type of claim 1, characterized in that: the filter (11) comprises a filter shell (110), a dust collection cylinder (111), a sleeve (112), a guide pipe (113) and a filter piece (114), wherein a dust collection air inlet (1100) is formed in the side wall of the filter shell (110), a dust collection air outlet (1101) is formed in the top end of the filter shell (110), the lower end of the filter shell (110) is arranged in a conical shape, the dust collection cylinder (111) is movably connected to the lower end of the filter shell (110), the upper end of the sleeve (112) is fixedly connected to the top end of the inner wall of the filter shell (110), the lower end of the sleeve (112) is sleeved outside the guide pipe (113) and is provided with an air guide channel (115) in a gap with the outer wall of the guide pipe (113), the lower end of the sleeve (112) is fixedly connected with the guide pipe (113) through a plurality of connecting rods (116), and the lower end of the guide pipe (113) extends into the, filter piece (114) fix in sleeve pipe (112) and with the inner wall clearance setting of sleeve (112), filter the lower extreme of piece (114) and extend to in guide tube (113), filter piece (114) and establish to the tube-shape, the opening part and the dust removal gas outlet (1101) of filtering piece (114) are connected.
3. The explosion-proof switch board of positive pressure type of claim 2, characterized in that: the bus direction of the dust removal air inlet (1100) is coincided with the tangential direction of the side wall of the filter shell (110), and the outer wall of the lower end of the filter shell (110) is connected with the inner wall of the upper end of the dust collection cylinder (111) through threads.
4. The explosion-proof switch board of positive pressure type of claim 2, characterized in that: the dehumidifier (12) comprises a dehumidifier shell (120), a semiconductor refrigeration sheet (121), a first sealing valve (122), a second sealing valve (123) and a third sealing valve (124), wherein the dehumidification chamber (1201) and the heat dissipation chamber (1202) are separated in the dehumidification shell (120) through a vertically arranged partition plate (1200), the semiconductor refrigeration sheet (121) is arranged on the partition plate (1200), the heating end and the heating end of the semiconductor refrigeration sheet (121) are respectively arranged in the dehumidification chamber (1201) and the heat dissipation chamber (1202), the heating end and the heating end of the semiconductor refrigeration sheet (121) are respectively provided with a cold-heat-conducting sheet (125) and a heat-temperature-conducting sheet (126), the bottom end in the dehumidifier shell (120) is provided with a water storage chamber (1203), the top end of the dehumidifier shell (120) is provided with a first inlet (1204) and a first outlet (1205) which are respectively communicated with the dehumidification chamber (1201) and the heat dissipation chamber (1202), the lower sides of the dehumidification cavity (1201) and the heat dissipation cavity (1202) are respectively provided with a second outlet (1206) and a second inlet (1207) which are communicated with the outside, the partition plate (1200) is provided with an air guide hole (1208) which is communicated with the dehumidification cavity (1201) and the heat dissipation cavity (1202), the second outlet (1206), the second inlet (1207) and the air guide hole (1208) are all arranged below the semiconductor refrigeration sheet (121), the first sealing valve (122) is arranged in the second outlet (1206), the second sealing valve (123) is arranged in the air guide hole (1208), and the third sealing valve (124) is arranged in the second inlet (1207).
5. The explosion-proof switch board of positive pressure type of claim 4, characterized in that: the first sealing valve (122), the second sealing valve (123) and the third sealing valve (124) are identical in structure, the third sealing valve (124) comprises a base (1240), a sealing plate (1241), a connecting sleeve (1242), a fixing plate (1243), a fixing shaft (1244), a driving motor (1245) and a spring (1246), the outer side wall of the base (1240) is fixed on the inner wall of the second inlet (1207) in a sealing manner, a rotating groove (12400) is arranged on the base (1240), a first through hole (12401) matched with the sealing plate (1241) is formed in the groove bottom of the rotating groove (12400), the sealing plate (1241) is tightly attached to the groove bottom of the rotating groove (12400) to rotate, a rectangular square shaft (1247) is arranged on one side, away from the first through hole (12401), of the sealing plate (1241), and a connecting groove (12420) which corresponds to the square shaft (1247) and is in sliding connection is arranged on the connecting sleeve (1242), the fixing plate (1243) is fixedly connected to the inner wall of the second inlet (1207) through a fixing shaft (1244), the driving motor (1245) is fixed to the fixing plate (1243), an output shaft of the driving motor (1245) penetrates through the fixing plate (1243) to be connected with the connecting sleeve (1242), a supporting ring (12421) is arranged on the outer wall of the connecting sleeve (1242), and a spring (1246) sleeved outside the connecting sleeve (1242) is arranged between the supporting ring (12421) and the sealing plate (1241).
6. The explosion-proof switch board of positive pressure type of claim 5, characterized in that: the groove wall of the rotating groove (12400) is provided with a sealing groove (12402) for the edge of the sealing plate (1241) to be connected in a rotating manner, a first sealing ring (1248) is arranged in the sealing groove (12402), and the first sealing ring (1248) is connected with one side, far away from the connecting sleeve (1242), of the sealing plate (1241).
7. The explosion-proof switch board of positive pressure type of claim 5, characterized in that: the switching valve (13) comprises a valve body (130), a shaft sleeve (131), a valve rod (132) and a valve clack (133), wherein the shaft sleeve (131), the valve rod (132) and the valve clack (133) are arranged in the valve body (130), a valve cavity (135) is formed in one end of the valve body (130), a medium inlet (1300), a first medium outlet (1301) and a second medium outlet (1302) are formed in the side wall of the valve body (130), the medium inlet (1300), the first medium outlet (1301) and the second medium outlet (1302) are communicated with the valve cavity (135), the shaft sleeve (131) is tightly matched and connected with the inner wall of the opening of the valve cavity (135), a medium channel (1310) communicated with the valve cavity (135) is formed in one end, far away from the opening of the valve cavity (135), a plurality of second through holes (1311) communicated with the medium channel (1310) and the second medium outlet (1302) are formed in the side wall of the shaft sleeve (131), the valve clack (133) is fixedly The hub connection, all be equipped with sealing strip (1330) on the front and back both ends of valve clack (133), sealing strip (1330) on valve clack (133) both ends cooperate sealedly with first medium export (1301) and medium passageway (1310) respectively, the cover is equipped with two separation blade (1320) on valve rod (132), two separation blade (1320) are established respectively on the front and back both ends of valve clack (133), separation blade (1320) on valve clack (133) front end and the inner chamber looks adaptation of first medium export (1301), separation blade (1320) and the inner chamber looks adaptation of medium passageway (1310) on valve clack (133) rear end, be equipped with a plurality of second sealing washer (136) between the outer wall of axle sleeve (131) and the inner wall of valve pocket (135), be equipped with Y type sealing washer (137) between valve rod (132) and axle sleeve (131).
8. The explosion-proof switch board of positive pressure type according to claim 7, characterized in that: the dust removal air outlet (1101) of the filter (11) is respectively communicated with a first inlet (1204) and a second inlet (1207) of a dehumidifier (12) through a first air duct (19), a second outlet (1206) of the dehumidifier (12) is communicated with the interior of the cabinet body (1), a first outlet (1205) of the dehumidifier (12) is connected with a medium inlet (1300) of the switching valve (13) through a second air duct (20), a first medium outlet (1301) of the switching valve (13) is communicated with a second exhaust port (6), a one-way valve (22) which can only exhaust outwards is arranged in the second exhaust port (6), and a second medium outlet (1302) of the switching valve (13) is communicated with the interior of the cabinet body (1).
9. The explosion-proof switch board of positive pressure type according to claim 7, characterized in that: the air inlet electromagnetic valve (9), the air inlet fan (10), the semiconductor refrigeration piece (121), the driving motor (1245), the push rod motor (134), the control device (21), the exhaust electromagnetic valve (14), the pressure sensor (17) and the temperature detector (18) are all electrically connected with the controller (16).
10. A method for using a positive pressure type explosion-proof power distribution cabinet according to any one of claims 1 to 9, wherein: the method comprises the following steps:
s1: when a second air inlet is used for air intake, if the pressure sensor (17) detects that the pressure value in the cabinet body (1) is smaller than X, the controller (16) closes the air intake electromagnetic valve (9), the air intake fan (10), the exhaust electromagnetic valve (14) and the first sealing valve (122), drives a push rod motor (134) of the switching valve (13) to pull back the valve rod (132) to seal the second medium outlet (1302), and starts the control device (21) to charge inert gas until the pressure value is larger than X;
s2: when the first air inlet is used for air intake, the controller (16) controls the control device (21) to stop filling inert gas, if the pressure sensor (17) detects that the pressure value in the cabinet body (1) is smaller than X, the exhaust electromagnetic valve (14) and the second sealing valve (123) are closed, the air intake electromagnetic valve (9), the air intake fan (10), the semiconductor refrigeration sheet (121), the first sealing valve (122) and the third sealing valve (124) are opened, and the push rod motor (134) of the switching valve (13) is driven to pull back the valve rod (132) to seal the second medium outlet (1302);
s3: external air is sucked by an air inlet fan (10), enters a filter (11) through a filter screen (8), an air inlet electromagnetic valve (9) and the air inlet fan (10) in sequence and is filtered, the filtered air enters a dehumidifying cavity (1201) of a dehumidifier (12) from a first inlet (1204) through a first air duct (19) to be cooled and dehumidified, the dehumidified dry cold air enters the cabinet body (1) through a first sealing valve (122), and moisture on a cold temperature guide sheet (125) is gathered and dripped in a water storage cavity (1203) to be collected;
s4: meanwhile, filtered air enters a heat dissipation cavity (1202) of the dehumidifier (12) through a first air duct (19) and a third sealing valve (124) to help a heat conduction temperature sheet (126) of a semiconductor refrigeration sheet (121) to dissipate heat, and heated hot air enters a valve cavity (135) of the switching valve (13) through a first outlet (1205) and a second air duct (20) and is then discharged out of the cabinet body (1) through a first medium outlet (1301) and a second exhaust port (6);
s5: when the pressure sensor (17) detects that the pressure value in the cabinet body (1) reaches X, the pressure sensor (17) sends a signal to the controller (16), the controller (16) controls the air inlet electromagnetic valve (9), the air inlet fan (10), the semiconductor refrigeration sheet (121) and the first sealing valve (122) to be closed, inflation is stopped, and the switching valve (13) keeps the sealing state of the second medium outlet (1302);
s6: when the pressure sensor (17) detects that the pressure value in the cabinet body (1) exceeds Y, Y is larger than X, the exhaust electromagnetic valve (14) is opened until the pressure value is smaller than Y, and then the exhaust electromagnetic valve (14) is closed;
s7: when the temperature detector (18) detects that the temperature in the cabinet body (1) is lower than Z and the pressure value in the cabinet body (1) is smaller than Y, the controller (16) controls the air inlet electromagnetic valve (9), the air inlet fan (10), the semiconductor refrigeration sheet (121) and the second sealing valve (123) to be opened, the first sealing valve (122) and the third sealing valve (124) are closed, and the push rod motor (134) of the switching valve (13) pushes the valve rod (132) to seal the first medium outlet (1301);
s8: outside air is sucked by the air inlet fan (10), enters the filter (11) through the filter screen (8), the air inlet electromagnetic valve (9) and the air inlet fan (10) in sequence and is filtered, the filtered air enters the dehumidification cavity (1201) of the dehumidifier (12) from the first inlet (1204) through the first air duct (19) to be cooled and dehumidified, then enters the heat dissipation cavity (1202) through the second sealing valve (123) to be heated, the heated dry warm air enters the valve cavity (135) of the switching valve (13) through the first outlet (1205) and the second air duct (20), and is discharged into the cabinet body (1) through the second medium outlet (1302) of the switching valve (13).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113157021A (en) * | 2021-06-04 | 2021-07-23 | 镇江云聚信息科技有限公司 | Temperature control device of intelligent cloud cabinet based on internet of things |
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| CN211579274U (en) * | 2020-08-12 | 2020-09-25 | 天津润锦油田技术服务有限公司 | Positive pressure explosion-proof control cabinet |
| CN211720856U (en) * | 2020-01-16 | 2020-10-20 | 河南华隆电气设备有限公司 | Positive pressure type explosion-proof cabinet |
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| CN101997271A (en) * | 2010-10-26 | 2011-03-30 | 南通金茂防爆电气有限公司 | Power distribution cabinet of positive voltage explosion-proof instrument |
| CN108321704A (en) * | 2018-02-27 | 2018-07-24 | 张乃月 | Explosion-proof positive pressure power distribution cabinet |
| CN211720856U (en) * | 2020-01-16 | 2020-10-20 | 河南华隆电气设备有限公司 | Positive pressure type explosion-proof cabinet |
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| CN113157021A (en) * | 2021-06-04 | 2021-07-23 | 镇江云聚信息科技有限公司 | Temperature control device of intelligent cloud cabinet based on internet of things |
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Effective date of registration: 20221208 Address after: No. 73, Xianfeng Village, Huaxi Street, Banan District, Chongqing 401320 (Xianfeng Park) Applicant after: Chongqing Xinbeidi Electric Co.,Ltd. Address before: 325000 Room 102, building 4, shibajiaxin village, Wuma street, Lucheng District, Wenzhou City, Zhejiang Province Applicant before: He Shaogu |
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