CN110529932B - IECEx explosion-proof air conditioner and control method - Google Patents
IECEx explosion-proof air conditioner and control method Download PDFInfo
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- CN110529932B CN110529932B CN201910920760.7A CN201910920760A CN110529932B CN 110529932 B CN110529932 B CN 110529932B CN 201910920760 A CN201910920760 A CN 201910920760A CN 110529932 B CN110529932 B CN 110529932B
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000007789 sealing Methods 0.000 claims abstract description 49
- 150000001875 compounds Chemical class 0.000 claims abstract description 13
- 239000003822 epoxy resin Substances 0.000 claims abstract description 13
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 13
- 238000005538 encapsulation Methods 0.000 claims description 25
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 230000000007 visual effect Effects 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000004593 Epoxy Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 3
- 238000002955 isolation Methods 0.000 description 8
- 238000004880 explosion Methods 0.000 description 7
- 238000012827 research and development Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0675—Electromagnet aspects, e.g. electric supply therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/02—Self-contained room units for air-conditioning, i.e. with all apparatus for treatment installed in a common casing
- F24F1/022—Self-contained room units for air-conditioning, i.e. with all apparatus for treatment installed in a common casing comprising a compressor cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
- F24F11/526—Indication arrangements, e.g. displays giving audible indications
Abstract
The invention discloses an IECEx explosion-proof air conditioner and a control method, wherein the IECEx explosion-proof air conditioner comprises an explosion-proof air conditioner shell, an explosion-proof compressor system, an explosion-proof electromagnetic valve, a first explosion-proof centrifugal fan, a second explosion-proof centrifugal fan, an explosion-proof axial flow fan, a third explosion-proof electric air valve and an explosion-proof intrinsic safety system are arranged in the explosion-proof air conditioner shell, and the explosion-proof compressor system is arranged in the explosion-proof air conditioner shell: the compressor terminal box is sealed with epoxy resin, the sealing thickness is not less than 3mm, the length of the cable coated by the sealing compound is not less than 5mm, the sealing thickness between wires in the compressor terminal box is not less than 3mm, the sealing thickness between terminals is not less than 8mm, the sealing thickness between the wires and the shell of the compressor terminal box is not less than 5mm, the sealing thickness between the terminals and the free surface of the sealing compound of the compressor terminal box is not less than 5mm, and the sealing thickness between the wires and the free surface of the sealing compound of the compressor terminal box is not less than 5mm. The explosion-proof air conditioner has good explosion-proof effect.
Description
Technical Field
The invention belongs to the technical field of explosion prevention, and particularly relates to an IECEx explosion-proof air conditioner and a control method.
Background
In industries such as chemical industry, medical treatment, scientific research, drilling and production, and the like, dangerous flammable gas environments possibly occur, so that serious threats are caused to personnel, electrical equipment and the like working in the environments, dangerous environments such as a control room, a laboratory, an operation room, an analysis room and the like with high temperature and staff are required to be guaranteed, cooling measures are required to be ensured, otherwise, the electric equipment with large heating value in some dangerous environments cannot be cooled, otherwise, the equipment is burnt, and aiming at the special environments, the cooling equipment such as an explosion-proof air conditioner and the like meeting the environmental requirements is required to be used for cooling.
At present, the demand for the explosion-proof air conditioner is increased internationally, so that the explosion-proof air conditioner is expected to enter the international market, the explosion-proof product must meet the explosion-proof standard of IECEx, namely the explosion-proof electric product certification system of International electrotechnical Commission, and the explosion-proof performance of the product is checked, and after the product is checked to be qualified, an explosion-proof qualified certificate is issued, so that the explosion-proof air conditioner is allowed to be sold in the international market.
In the prior art, be equipped with compressor system, solenoid valve, centrifugal fan, axial fan, electronic blast gate and this ampere of system in the indoor integrative air conditioner shell of outdoor, be equipped with air inlet end on the air conditioner shell, the air-out end, new tuber pipe and supply-air outlet, be equipped with the return air inlet in the air conditioner shell, supply-air outlet and return air inlet communicate with indoor through pipeline respectively, be equipped with electronic blast gate on the new tuber pipe, the air conditioner is even to have electrical control box outward, compressor system includes the compressor, the condenser, the evaporimeter, the gas-liquid separator, the expansion valve, solenoid valve and this ampere of system, the solenoid valve includes solenoid, temperature fuse, current fuse, solenoid valve shell and valve body, centrifugal fan includes the motor, the belt pulley, spiral case and impeller.
The products are manufactured according to IECEx explosion-proof standards, and new research and development on the structure and control of the products are required.
Disclosure of Invention
The invention provides an IECEx explosion-proof air conditioner and a control method thereof, and the explosion-proof air conditioner has good explosion-proof effect.
In order to solve the technical problems, the invention adopts the following technical scheme:
an IECEx explosion-proof air conditioner comprises an explosion-proof air conditioner shell, wherein an explosion-proof compressor system, an explosion-proof electromagnetic valve, a first explosion-proof centrifugal fan, a second explosion-proof centrifugal fan, an explosion-proof axial flow fan, a third explosion-proof electric air valve and an explosion-proof intrinsic safety system are arranged in the explosion-proof air conditioner shell;
the explosion-proof compressor system comprises a compressor, a condenser, an evaporator, a gas-liquid separator, an expansion valve, an explosion-proof electromagnetic valve and an explosion-proof intrinsic safety system, wherein the compressor junction box is sealed by epoxy resin, the sealing thickness is not less than 3mm, the length of a cable covered by a sealing compound is not less than 5mm, a compressor temperature fuse is arranged in the compressor junction box, the sealing thickness between wires in the compressor junction box is not less than 3mm, the sealing thickness between terminals in the compressor junction box and the terminals is not less than 8mm, the sealing thickness between wires in the compressor junction box and a shell of the compressor junction box is not less than 5mm, the sealing thickness between the terminals in the compressor junction box and the free surface of the sealing compound of the compressor junction box is not less than 5mm, the compressor is connected in series to the explosion-proof electric control box through two pressure switches, and a temperature sensor is arranged at an exhaust port of the compressor;
the explosion-proof electromagnetic valve comprises an electromagnetic coil, an electromagnetic valve temperature fuse, a current fuse, an explosion-proof electromagnetic valve shell and a valve body, wherein the electromagnetic coil, the electromagnetic valve temperature fuse and the current fuse are all encapsulated in the explosion-proof electromagnetic valve shell through epoxy resin, the explosion-proof electromagnetic valve shell is installed on the valve body again, the electromagnetic coil is encapsulated by the epoxy resin alone to form an electromagnetic coil encapsulation box, the encapsulation thickness between an explosion-proof electromagnetic valve wire and the wire is more than or equal to 2mm, the encapsulation thickness between the wire and the explosion-proof electromagnetic valve shell is more than or equal to 5mm, the encapsulation thickness between the electromagnetic coil, the temperature fuse and the current fuse is more than or equal to 5mm, the encapsulation thickness between the electromagnetic coil and the explosion-proof electromagnetic valve shell is more than or equal to 6mm, the encapsulation thickness between the current fuse and the explosion-proof electromagnetic valve shell is more than or equal to 6mm, the encapsulation composite is coated on the cable length which is not less than 5mm, and the electromagnetic valve grounding device is arranged outside the electromagnetic coil encapsulation box in the explosion-proof electromagnetic valve shell and inside the electromagnetic coil encapsulation box;
the first explosion-proof centrifugal fan and the second explosion-proof centrifugal fan are identical in structure, the first explosion-proof centrifugal fan comprises an explosion-proof motor, an antistatic belt, a belt pulley, a volute and an impeller, the space distance between the antistatic belt and peripheral components of the explosion-proof centrifugal fan is more than or equal to 30mm, the space distance between the belt pulley and a shell of the explosion-proof motor is more than or equal to 15mm, the space distance between the belt pulley and the volute is more than or equal to 15mm, and a wind pressure differential switch is arranged at an air outlet of the explosion-proof centrifugal fan.
Further, a control box grounding device is arranged in the explosion-proof electric control box, the explosion-proof electric control box explosion-proof shell is composed of a box cover and a box body, the box cover is divided into an upper box cover and a lower box cover, a main cavity and a wiring cavity are arranged in the box body, the main cavity and the wiring cavity are electrically connected by adopting a terminal sleeve, a PLC module, an alternating-current contactor, a thermal relay, an isolated safety grid, a switching power supply, a miniature circuit breaker and the like are arranged in the main cavity, a wiring terminal is arranged in the wiring cavity, an electric gap between the wiring terminal and the control box grounding device is more than or equal to 3mm, the wiring terminal comprises an intrinsic safety circuit wiring terminal and a non-intrinsic safety circuit wiring terminal, an electric gap between exposed conductive parts of the intrinsic safety circuit wiring terminal and the non-intrinsic safety circuit wiring terminal is not less than 50mm, an electric gap between exposed conductive parts of the wiring terminals for connecting different intrinsic safety circuits is not less than 6mm.
Further, the anti-explosion intrinsic safety system comprises an isolation type safety grid, a PT100 temperature sensor, a high/low voltage protection switch and a pressure controller, wherein the PT100 temperature sensor is matched with the GS8572-EX.RTD isolation type safety grid, the high/low voltage protection switch and the pressure controller are matched with the GS8512-EX.22 isolation type safety grid, and the maximum connection length of cables between the isolation type safety grid and the PT100 temperature sensor, the high/low voltage protection switch and the pressure controller is less than or equal to 30m.
Further, both pressure switches are CK type pressure switches.
Further, the electromagnetic coil is individually molded with 6101 epoxy.
Further, the explosion-proof type of the explosion-proof electrical control box is explosion-proof type Ex db ib.
Further, the IECEx explosion-proof standard which the explosion-proof air conditioner meets is: IEC60079-0, IEC60079-1, IEC 60079-2, IEC60079-11, IEC60079-18, ISO/IEC80079-36, ISO/IEC80079-37.
Further, an audible and visual alarm is arranged on the explosion-proof air conditioner, and a door switch buzzer is arranged in the explosion-proof electric control box.
The control method of the IECEx explosion-proof air conditioner,
(1) An explosion-proof compressor system:
after the welding of the explosion-proof compressor system is finished, a pressure maintaining test is needed, namely, the explosion-proof compressor system is filled with nitrogen with the pressure of 3MPa, and the pressure is qualified after 24 hours without reduction;
the high-pressure protection control method of the compressor comprises the following steps: the method comprises the steps that two CK-type pressure switches are adopted to connect the compressors in series into an explosion-proof electrical control box, the pressure switches are in a closed state in a normal state, when the pressure of an exhaust port of the compressors is more than or equal to 2.4MPa, the pressure switches are disconnected, an explosion-proof compressor system is powered off simultaneously, when the pressure of the exhaust port of the compressors is less than or equal to 2MPa, an alarm is manually reset on a controller in the explosion-proof electrical control box, the pressure switches are reset, and the explosion-proof compressor system is restored to be normal;
the low-pressure protection control method of the compressor comprises the following steps: the method comprises the steps that two CK-type pressure switches are adopted to connect the compressors in series into an explosion-proof electrical control box, the pressure switches are in a closed state in a normal state, when the pressure of an exhaust port of the compressors is less than or equal to 0.05MPa, the pressure switches are disconnected, an explosion-proof compressor system is powered off simultaneously, when the pressure of the exhaust port of the compressors is more than or equal to 0.15MPa, an alarm is manually reset on a controller in the explosion-proof electrical control box, the pressure switches are reset, and the explosion-proof compressor system is restored to be normal;
when a temperature sensor arranged at the exhaust port of the compressor senses that the temperature of the exhaust port of the compressor reaches 98 ℃, the explosion-proof compressor system stops working, and the explosion-proof compressor system returns to normal after manual reset;
(2) The control method of the explosion-proof centrifugal fan comprises the following steps:
when the explosion-proof motor is electrified, the antistatic belt and the impeller rotate simultaneously, a wind pressure differential pressure switch arranged at the air outlet of the explosion-proof centrifugal fan detects wind pressure, the explosion-proof centrifugal fan operates normally, when the explosion-proof motor is electrified, the antistatic belt and the impeller do not rotate in a fault state, the wind pressure differential pressure switch arranged at the air outlet of the explosion-proof centrifugal fan does not detect wind pressure, and a controller in an explosion-proof electric control box immediately stops the power supply of the explosion-proof motor;
(3) The indoor positive pressure control method comprises the following steps:
1) The indoor positive pressure range is 25-70Pa;
2) When the explosion-proof air conditioner normally operates, the first explosion-proof centrifugal fan and the first explosion-proof electric air valve are started, the explosion-proof compressor system is started, when the indoor positive pressure cannot meet the requirement, the second explosion-proof centrifugal fan is started, when the indoor positive pressure cannot be ensured after the first explosion-proof centrifugal fan and the second explosion-proof centrifugal fan are simultaneously started, the second explosion-proof electric air valve is started, and if the indoor positive pressure requirement cannot be met, an audible and visual alarm installed on the explosion-proof air conditioner alarms;
3) When the door is opened, a door opening and closing buzzer installed in the explosion-proof electric control box gives an alarm after a period of time delay, and when the door is closed, the door opening and closing buzzer stops giving an alarm;
4) When the door is opened, the explosion-proof compressor system normally operates, after a period of time, the second explosion-proof centrifugal fan and the second explosion-proof electric air valve are opened to convey fresh air indoors, so that air quantity of 0.3m/s is ensured to be output indoors to outdoors, when the door is closed, the indoor positive pressure reaches 70Pa, and when the second explosion-proof centrifugal fan and the second explosion-proof electric air valve are closed;
5) When the first explosion-proof centrifugal fan fails, the operation of the explosion-proof compressor system is stopped, and the second explosion-proof centrifugal fan and the second explosion-proof electric air valve are opened to ensure indoor positive pressure.
Further, the method comprises the steps of,
in the step 3) of the indoor positive pressure control method, when a door is opened, a door switch buzzer arranged in an explosion-proof electric control box gives an alarm after a delay of 30 seconds;
in the step 4) of the indoor positive pressure control method, when the door is opened, the explosion-proof compressor system normally operates, and after time delay is 10 seconds, the second explosion-proof centrifugal fan and the second explosion-proof electric air valve are opened to convey fresh air into the room.
The air flow circulation process of the explosion-proof air conditioner comprises the following steps:
the explosion-proof centrifugal fan sucks indoor hot air into the explosion-proof air conditioner from the return air inlet, the indoor hot air is changed into cold air through heat exchange with the evaporator, the cold air is sent into the room from the air supply inlet, and the air flow process is as follows: indoor hot air, an air return port, an evaporator, an explosion-proof centrifugal fan, an air supply port and a room;
fresh air outside enters the explosion-proof air conditioner from the fresh air inlet, the fresh air and indoor hot air are mixed in the explosion-proof air conditioner, and the mixed hot air enters the room through the evaporator, the explosion-proof centrifugal fan and the air supply inlet;
the outdoor natural air is sucked into the explosion-proof air conditioner from the air inlet end by the explosion-proof axial flow fan, the heat on the surface of the condenser is taken away by the outdoor natural air through heat exchange with the condenser, the natural air carrying the heat reaches the air outlet end through the explosion-proof axial flow fan and returns to the outdoor natural air, and the air flow process comprises the following steps: outdoor natural air, an air inlet end, a condenser, an explosion-proof axial flow fan, an air outlet end and outdoor natural air.
Compared with the prior art, the invention has the beneficial effects that:
in the present invention,
the technical requirements of the explosion-proof compressor system are as follows: the compressor junction box is sealed by epoxy resin, the sealing thickness is not less than 3mm, the length of a cable covered by the sealing compound is not less than 5mm, a compressor temperature fuse is arranged in the compressor junction box, when the temperature of a sealing object in the compressor junction box reaches a certain temperature, the compressor temperature fuse is fused to stop the explosion-proof compressor system, the sealing thickness between wires in the compressor junction box is not less than 3mm, the sealing thickness between terminals in the compressor junction box is not less than 8mm, the sealing thickness between wires in the compressor junction box and a shell of the compressor junction box is not less than 5mm, the sealing thickness between the terminals in the compressor junction box and the free surface of the sealing compound of the compressor junction box is not less than 5mm, the sealing thickness between the wires in the compressor junction box and the free surface of the sealing compound of the compressor junction box is not less than 5mm, the compressor is connected in series through two pressure switches to the explosion-proof electric control box, a temperature sensor is arranged at an exhaust port of the compressor,
the technical requirements of the explosion-proof electromagnetic valve are as follows: the electromagnetic coil, the electromagnetic valve temperature fuse and the current fuse are all sealed in the explosion-proof electromagnetic valve shell through epoxy resin, the explosion-proof electromagnetic valve shell is mounted on the valve body, the electromagnetic coil is singly sealed by epoxy resin to form an electromagnetic coil sealing box, the sealing thickness between the conducting wire of the explosion-proof electromagnetic valve and the conducting wire is more than or equal to 2mm, the sealing thickness between the conducting wire and the explosion-proof electromagnetic valve shell is more than or equal to 5mm, the sealing thickness between the electromagnetic coil, the temperature fuse and the current fuse is more than or equal to 5mm, the sealing thickness between the electromagnetic coil and the explosion-proof electromagnetic valve shell is more than or equal to 6mm, the sealing thickness between the temperature fuse and the explosion-proof electromagnetic valve shell is more than or equal to 6mm, the sealing compound is used for covering the cable length which is not less than 5mm, an insulating sheath is additionally arranged at the leading-out cable of the explosion-proof electromagnetic valve shell to protect the cable from mechanical damage, electromagnetic coil sealing box in the explosion-proof electromagnetic valve shell and electromagnetic coil sealing box are provided with electromagnetic grounding devices,
the first and second explosion-proof centrifugal fans have the same structure, and the technical requirements of the first explosion-proof centrifugal fan are as follows: the space distance between the anti-static belt and peripheral components of the anti-explosion centrifugal fan is more than or equal to 30mm, the space distance between the belt pulley and the shell of the anti-explosion motor is more than or equal to 15mm, the space distance between the belt pulley and the volute is more than or equal to 15mm, a wind pressure differential switch is arranged at the air outlet of the anti-explosion centrifugal fan and used for detecting whether the anti-explosion motor, the anti-static belt and the impeller rotate simultaneously,
the technical requirements of the explosion-proof electrical control box are as follows: the explosion-proof type is explosion-proof type 'Ex db ib', a control box grounding device is arranged in an explosion-proof electric control box, an explosion-proof shell of the explosion-proof electric control box consists of a box cover and a box body, the box cover is divided into an upper box cover and a lower box cover, a main cavity and a wiring cavity are arranged in the box body, the main cavity and the wiring cavity are electrically connected by adopting a terminal sleeve, a PLC module, an alternating-current contactor, a thermal relay, an isolated safety grid, a switching power supply, a miniature circuit breaker and the like are arranged in the main cavity, a wiring terminal is arranged in the wiring cavity, the electrical gap between the wiring terminal and the control box grounding device is more than or equal to 3mm, the wiring terminal comprises an intrinsic safety circuit wiring terminal and a non-intrinsic safety circuit wiring terminal, the electrical gap between the intrinsic safety circuit wiring terminal and a non-intrinsic safety circuit wiring terminal exposed conductive part is not less than 50mm, the intrinsic safety wires and the electrical gap between the exposed conductive parts of the wiring terminals for different intrinsic safety circuit connection outside is more than or equal to 6mm,
the technical requirements of the explosion-proof intrinsic safety system are as follows: the explosion-proof intrinsic safety system comprises an isolated safety grid, a PT100 temperature sensor, a high/low voltage protection switch and a pressure controller, wherein the PT100 temperature sensor is matched with the GS8572-EX.RTD isolated safety grid, the high/low voltage protection switch and the pressure controller are matched with the GS8512-EX.22 isolated safety grid, the maximum connection length of cables between the isolated safety grid and the PT100 temperature sensor, between the isolated safety grid and the high/low voltage protection switch and between the isolated safety grid and the pressure controller are less than or equal to 30m,
the explosion-proof compressor system, the explosion-proof electromagnetic valve, the first explosion-proof centrifugal fan, the second explosion-proof centrifugal fan, the explosion-proof electrical control box and the explosion-proof intrinsic safety system all carry out explosion-proof measures, the explosion-proof compressor system, the explosion-proof electromagnetic valve, the first explosion-proof centrifugal fan, the second explosion-proof centrifugal fan, the explosion-proof electrical control box and the explosion-proof intrinsic safety system can cooperatively improve the explosion-proof effect of the explosion-proof air conditioner under the treatment of respective technical requirements, and the IECEx explosion-proof standard which is met after the explosion-proof air conditioner is subjected to explosion-proof authentication is as follows: IEC60079-0, IEC60079-1, IEC 60079-2, IEC60079-11, IEC60079-18, ISO/IEC80079-36, ISO/IEC80079-37.
Drawings
FIG. 1 is a schematic diagram of a three-dimensional structure of an IECEx explosion-proof air conditioner with an explosion-proof air conditioner housing removed and an explosion-proof electrical control box omitted;
FIG. 2 is a schematic diagram of a perspective structure of an IECEx explosion-proof air conditioner with an explosion-proof electrical control box omitted;
FIG. 3 is a schematic view of the structure of FIG. 2 in another direction;
FIG. 4 is a schematic diagram of the front view of the explosion-proof electrical control box of FIG. 2;
FIG. 5 is a schematic top view of FIG. 2;
fig. 6 is a schematic bottom view of fig. 2.
Description of the drawings: 1. a first explosion-proof electric air valve, 2, a second explosion-proof electric air valve, 3, a second explosion-proof centrifugal fan, 4, a first explosion-proof centrifugal fan, 5, an explosion-proof compressor system, 6, an explosion-proof axial flow fan, 7, an explosion-proof intrinsic safety system, 8, a third explosion-proof electric air valve, 9, an explosion-proof electromagnetic valve, 10, an explosion-proof electric control box, 11, an explosion-proof air conditioner shell, 12, an air inlet end, 13, an air outlet end, 14, a first fresh air pipe, 15, a second fresh air pipe, 16, an air supply port, 17, an air return port, 18, a first fresh air port, 19 and a second fresh air port.
Detailed Description
As shown in fig. 1, 2, 3, 4, 5 and 6, an IECEx explosion-proof air conditioner comprises an explosion-proof air conditioner shell 11, wherein an explosion-proof compressor system 5, an explosion-proof electromagnetic valve 9, a first explosion-proof centrifugal fan 4, a second explosion-proof centrifugal fan 3, an explosion-proof axial flow fan 6, a third explosion-proof electric air valve 8 and an explosion intrinsic safety system 7 are arranged in the explosion-proof air conditioner shell 11, an air inlet end 12, an air outlet end 13, a first new air pipe 14, a second new air pipe 15 and an air supply opening 16 are arranged on the explosion-proof air conditioner shell 11, an air return opening 17 is arranged in the explosion-proof air conditioner shell 11, the air supply opening 16 and the air return opening 17 are respectively communicated with a room through pipelines, a first explosion-proof electric air valve 1 and a second explosion-proof electric air valve 2 are respectively arranged on the first new air pipe 14 and the second new air pipe 15, the free ends of the first new air pipe 14 and the second new air pipe 15 are respectively a first new air inlet 18 and a second new air inlet 19, and the explosion-proof air conditioner is externally connected with an explosion-proof electric control box 10;
the explosion-proof compressor system 5 comprises a compressor, a condenser, an evaporator, a gas-liquid separator, an expansion valve, an explosion-proof electromagnetic valve 9 and an explosion-proof intrinsic safety system 7, wherein the compressor junction box is sealed by epoxy resin, the sealing thickness is not less than 3mm, the length of a sealing compound coated cable is not less than 5mm, a compressor temperature fuse is arranged in the compressor junction box, the sealing thickness between wires in the compressor junction box is not less than 3mm, the sealing thickness between terminals in the compressor junction box and the terminals is not less than 8mm, the sealing thickness between the wires in the compressor junction box and the shell of the compressor junction box is not less than 5mm, the sealing thickness between the terminals in the compressor junction box and the free surface of the sealing compound of the compressor junction box is not less than 5mm, the compressor is connected in series to the explosion-proof electric control box 10 through two CK pressure switches, and a temperature sensor is arranged at an exhaust port of the compressor;
the explosion-proof electromagnetic valve 9 comprises an electromagnetic coil, an electromagnetic valve temperature fuse, a current fuse, an explosion-proof electromagnetic valve shell and a valve body, wherein the electromagnetic coil, the electromagnetic valve temperature fuse and the current fuse are all encapsulated in the explosion-proof electromagnetic valve shell through epoxy resin, the explosion-proof electromagnetic valve shell is installed on the valve body again, the electromagnetic coil is encapsulated by 6101 epoxy resin alone to form an electromagnetic coil encapsulation box, the encapsulation thickness between a wire of the explosion-proof electromagnetic valve 9 and the wire is more than or equal to 2mm, the encapsulation thickness between the wire and the explosion-proof electromagnetic valve shell is more than or equal to 5mm, the encapsulation thickness between the electromagnetic coil, the temperature fuse and the current fuse is more than or equal to 5mm, the encapsulation thickness between the electromagnetic coil and the explosion-proof electromagnetic valve shell is more than or equal to 6mm, the encapsulation composite is coated on the valve body, an insulation sheath is additionally arranged at a lead-out cable of the explosion-proof electromagnetic valve 9, and the electromagnetic coil encapsulation box are both internally provided with electromagnetic valve grounding devices;
the first explosion-proof centrifugal fan 4 and the second explosion-proof centrifugal fan 3 have the same structure, the first explosion-proof centrifugal fan 4 comprises an explosion-proof motor, an antistatic belt, a belt pulley, a volute and an impeller, the space distance between the antistatic belt and peripheral components of the explosion-proof centrifugal fan is more than or equal to 30mm, the space distance between the belt pulley and a shell of the explosion-proof motor is more than or equal to 15mm, the space distance between the belt pulley and the volute is more than or equal to 15mm, and an air pressure differential switch is arranged at an air outlet of the explosion-proof centrifugal fan.
The explosion-proof type of the explosion-proof electrical control box 10 is explosion-proof type Ex db ib, a control box grounding device is arranged in the explosion-proof electrical control box 10, an explosion-proof shell of the explosion-proof electrical control box 10 is composed of a box cover and a box body, the box cover is divided into an upper box cover and a lower box cover, a main cavity and a wiring cavity are arranged in the box body, the main cavity and the wiring cavity are electrically connected by adopting a terminal sleeve, a PLC module, an alternating-current contactor, a thermal relay, an isolated safety grid, a switching power supply, a miniature circuit breaker and the like are arranged in the main cavity, wiring terminals are arranged in the wiring cavity, an electrical gap between the wiring terminals and the control box grounding device is more than or equal to 3mm, the wiring terminals comprise an intrinsic safety circuit wiring terminal and a non-intrinsic safety circuit wiring terminal, an electrical gap between exposed conductive parts of the intrinsic safety circuit wiring terminals and the non-intrinsic safety circuit wiring terminals is not less than 50mm, an intrinsic safety wire is separately wired, and an electrical gap between exposed conductive parts of the wiring terminals for connecting different intrinsic safety circuits to outside is more than or equal to 6mm.
The explosion-proof intrinsic safety system 7 comprises an isolation type safety grid, a PT100 temperature sensor, a high/low voltage protection switch and a pressure controller, wherein the PT100 temperature sensor is matched with the GS8572-EX.RTD isolation type safety grid, the high/low voltage protection switch and the pressure controller are matched with the GS8512-EX.22 isolation type safety grid, and the maximum connection length of cables between the isolation type safety grid and the PT100 temperature sensor, the high/low voltage protection switch and the pressure controller is less than or equal to 30m.
Wherein, the IECEx explosion-proof standard that explosion-proof air conditioner accords with is: IEC60079-0, IEC60079-1, IEC 60079-2, IEC60079-11, IEC60079-18, ISO/IEC80079-36, ISO/IEC80079-37.
Wherein, install audible and visual alarm on the explosion-proof air conditioner, install door switch buzzer in the explosion-proof electrical control box 10.
The control method of the IECEx explosion-proof air conditioner,
(1) Explosion-proof compressor system 5:
after the welding of the explosion-proof compressor system 5 is finished, a pressure maintaining test is needed, namely, the explosion-proof compressor system 5 is filled with nitrogen with the pressure of 3MPa, and the pressure is qualified after 24 hours without reduction;
the high-pressure protection control method of the compressor comprises the following steps: the method comprises the steps that two CK-type pressure switches are adopted to connect compressors in series into an explosion-proof electrical control box 10, the pressure switches are in a closed state in a normal state, when the pressure of an exhaust port of the compressors is more than or equal to 2.4MPa, the pressure switches are disconnected, an explosion-proof compressor system 5 is powered off simultaneously, when the pressure of the exhaust port of the compressors is less than or equal to 2MPa, after a controller in the explosion-proof electrical control box 10 is manually reset, the pressure switches are reset, and the explosion-proof compressor system 5 is restored to be normal;
the low-pressure protection control method of the compressor comprises the following steps: the method comprises the steps that two CK-type pressure switches are adopted to connect compressors in series into an explosion-proof electrical control box 10, the pressure switches are in a closed state in a normal state, when the pressure of an exhaust port of the compressors is less than or equal to 0.05MPa, the pressure switches are disconnected, an explosion-proof compressor system 5 is powered off simultaneously, when the pressure of the exhaust port of the compressors is more than or equal to 0.15MPa, after a controller in the explosion-proof electrical control box 10 is manually reset, the pressure switches are reset, and the explosion-proof compressor system 5 is restored to normal;
when a temperature sensor arranged at the exhaust port of the compressor senses that the temperature of the exhaust port of the compressor reaches 98 ℃, the explosion-proof compressor system 5 stops working, and the explosion-proof compressor system 5 returns to normal after manual reset;
(2) The control method of the explosion-proof centrifugal fan comprises the following steps:
when the explosion-proof motor is electrified, the antistatic belt and the impeller rotate simultaneously, a wind pressure differential pressure switch arranged at the air outlet of the explosion-proof centrifugal fan detects wind pressure, the explosion-proof centrifugal fan operates normally, when the explosion-proof motor is electrified, the antistatic belt and the impeller do not rotate in a fault state, the wind pressure differential pressure switch arranged at the air outlet of the explosion-proof centrifugal fan does not detect wind pressure, and a controller in the explosion-proof electric control box 10 immediately stops the power supply of the explosion-proof motor;
(3) The indoor positive pressure control method comprises the following steps:
1) The indoor positive pressure range is 25-70Pa;
2) When the explosion-proof air conditioner normally operates, the first explosion-proof centrifugal fan 4 and the first explosion-proof electric air valve 1 are opened, the explosion-proof compressor system 5 is opened, when the indoor positive pressure cannot meet the requirement, the second explosion-proof centrifugal fan 3 is opened, when the indoor positive pressure cannot be ensured after the first explosion-proof centrifugal fan 4 and the second explosion-proof centrifugal fan 3 are simultaneously opened, the second explosion-proof electric air valve 2 is opened, and if the indoor positive pressure requirement cannot be met, an audible and visual alarm arranged on the explosion-proof air conditioner alarms;
3) When the door is opened, a door opening and closing buzzer installed in the explosion-proof electrical control box 10 gives an alarm after a delay of 30 seconds, and when the door is closed, the door opening and closing buzzer stops giving an alarm;
4) When the door is opened, the explosion-proof compressor system 5 normally operates, after a delay of 10 seconds, the second explosion-proof centrifugal fan 3 and the second explosion-proof electric air valve 2 are opened to convey fresh air indoors, so that air quantity of 0.3m/s is ensured to be output indoors to outdoors, when the door is closed, and when the indoor positive pressure reaches 70Pa, the second explosion-proof centrifugal fan 3 and the second explosion-proof electric air valve 2 are closed;
5) When the first explosion-proof centrifugal fan 4 fails, the operation of the explosion-proof compressor system 5 is stopped, the second explosion-proof centrifugal fan 3 and the second explosion-proof electric air valve 2 are opened, and indoor positive pressure is ensured.
The air flow circulation process of the explosion-proof air conditioner comprises the following steps:
the explosion-proof centrifugal fan sucks indoor hot air into the explosion-proof air conditioner from the return air inlet 17, the indoor hot air is changed into cold air through heat exchange with the evaporator, the cold air is sent into the room from the air supply inlet 16, and the air flow process is as follows: indoor hot air, an air return opening 17, an evaporator, an explosion-proof centrifugal fan, an air supply opening 16 and indoor;
fresh air outside enters the explosion-proof air conditioner from the fresh air inlet, the fresh air and indoor hot air are mixed in the explosion-proof air conditioner, and the mixed hot air enters the room through the evaporator, the explosion-proof centrifugal fan and the air supply inlet 16;
the outdoor natural air is sucked into the explosion-proof air conditioner from the air inlet end 12 by the explosion-proof axial flow fan 6, the heat on the surface of the condenser is taken away by the outdoor natural air through heat exchange with the condenser, the natural air carrying the heat reaches the air outlet end 13 through the explosion-proof axial flow fan 6 and returns to the outdoor natural air, and the air flow process comprises the following steps: outdoor natural air, an air inlet end 12, a condenser, an explosion-proof axial flow fan 6, an air outlet end 13 and outdoor natural air.
Claims (7)
1. An IECEx explosion-proof air conditioner is characterized by comprising an explosion-proof air conditioner shell, wherein an explosion-proof compressor system, an explosion-proof electromagnetic valve, a first explosion-proof centrifugal fan, a second explosion-proof centrifugal fan, an explosion-proof axial flow fan, a third explosion-proof electric air valve and an explosion-proof intrinsic safety system are arranged in the explosion-proof air conditioner shell;
the explosion-proof compressor system comprises a compressor, a condenser, an evaporator, a gas-liquid separator, an expansion valve, an explosion-proof electromagnetic valve and an explosion-proof intrinsic safety system, wherein the compressor junction box is sealed by epoxy resin, the sealing thickness is not less than 3mm, the length of a cable covered by a sealing compound is not less than 5mm, a compressor temperature fuse is arranged in the compressor junction box, the sealing thickness between wires in the compressor junction box is not less than 3mm, the sealing thickness between terminals in the compressor junction box and the terminals is not less than 8mm, the sealing thickness between wires in the compressor junction box and a shell of the compressor junction box is not less than 5mm, the sealing thickness between the terminals in the compressor junction box and the free surface of the sealing compound of the compressor junction box is not less than 5mm, the compressor is connected in series to the explosion-proof electric control box through two pressure switches, and a temperature sensor is arranged at an exhaust port of the compressor;
the explosion-proof electromagnetic valve comprises an electromagnetic coil, an electromagnetic valve temperature fuse, a current fuse, an explosion-proof electromagnetic valve shell and a valve body, wherein the electromagnetic coil, the electromagnetic valve temperature fuse and the current fuse are all encapsulated in the explosion-proof electromagnetic valve shell through epoxy resin, the explosion-proof electromagnetic valve shell is installed on the valve body again, the electromagnetic coil is encapsulated by the epoxy resin alone to form an electromagnetic coil encapsulation box, the encapsulation thickness between an explosion-proof electromagnetic valve wire and the wire is more than or equal to 2mm, the encapsulation thickness between the wire and the explosion-proof electromagnetic valve shell is more than or equal to 5mm, the encapsulation thickness between the electromagnetic coil, the temperature fuse and the current fuse is more than or equal to 5mm, the encapsulation thickness between the electromagnetic coil and the explosion-proof electromagnetic valve shell is more than or equal to 6mm, the encapsulation thickness between the current fuse and the explosion-proof electromagnetic valve shell is more than or equal to 6mm, the encapsulation composite is coated on the cable length which is not less than 5mm, and the electromagnetic valve grounding device is arranged outside the electromagnetic coil encapsulation box in the explosion-proof electromagnetic valve shell and inside the electromagnetic coil encapsulation box;
the first explosion-proof centrifugal fan and the second explosion-proof centrifugal fan have the same structure, the first explosion-proof centrifugal fan comprises an explosion-proof motor, an antistatic belt, a belt pulley, a volute and an impeller, the space distance between the antistatic belt and peripheral components of the explosion-proof centrifugal fan is more than or equal to 30mm, the space distance between the belt pulley and a shell of the explosion-proof motor is more than or equal to 15mm, the space distance between the belt pulley and the volute is more than or equal to 15mm, and an air pressure differential switch is arranged at an air outlet of the explosion-proof centrifugal fan;
the explosion-proof electric control box is internally provided with a control box grounding device, an explosion-proof casing of the explosion-proof electric control box consists of a box cover and a box body, the box cover is divided into an upper box cover and a lower box cover, a main cavity and a wiring cavity are arranged in the box body, the main cavity and the wiring cavity are electrically connected by adopting a terminal sleeve, a PLC module, an alternating-current contactor, a thermal relay, an isolated safety grid, a switching power supply, a miniature circuit breaker and the like are arranged in the main cavity, a wiring terminal is arranged in the wiring cavity, an electric gap between the wiring terminal and the control box grounding device is more than or equal to 3mm, the wiring terminal comprises an intrinsic safety circuit wiring terminal and a non-intrinsic safety circuit wiring terminal, an electric gap between exposed conductive parts of the intrinsic safety circuit wiring terminal and the non-intrinsic safety circuit wiring terminal is not less than 50mm, an intrinsic safety wire and a non-intrinsic safety wire are separately wired, and an electric gap between exposed conductive parts of the wiring terminals for connecting different intrinsic safety circuits to the outside is more than or equal to 6mm;
the explosion-proof intrinsic safety system comprises an isolated safety grid, a PT100 temperature sensor, a high/low voltage protection switch and a pressure controller, wherein the PT100 temperature sensor is matched with the GS8572-EX.RTD isolated safety grid, the pressure controller is matched with the GS8512-EX.22 isolated safety grid, and the maximum connection length of cables between the isolated safety grid and the PT100 temperature sensor, between the isolated safety grid and the pressure controller and between the isolated safety grid and the pressure controller are less than or equal to 30m.
2. The IECEx explosion-proof air conditioner of claim 1, wherein: both pressure switches are CK type pressure switches.
3. The IECEx explosion-proof air conditioner of claim 1, wherein: the electromagnetic coil is individually molded with 6101 epoxy.
4. The IECEx explosion-proof air conditioner of claim 1, wherein: the explosion-proof type of the explosion-proof electrical control box is explosion-proof type Exdb ib.
5. The IECEx explosion-proof air conditioner of claim 1, wherein: an audible and visual alarm is arranged on the explosion-proof air conditioner, and a door switch buzzer is arranged in the explosion-proof electric control box.
6. A control method of an IECEx explosion-proof air conditioner as set forth in any one of claims 1 to 5, characterized in that,
(1) An explosion-proof compressor system:
after the welding of the explosion-proof compressor system is finished, a pressure maintaining test is needed, namely, the explosion-proof compressor system is filled with nitrogen with the pressure of 3MPa, and the pressure is qualified after 24 hours without reduction;
the high-pressure protection control method of the compressor comprises the following steps: the method comprises the steps that two CK-type pressure switches are adopted to connect the compressors in series into an explosion-proof electrical control box, the pressure switches are in a closed state in a normal state, when the pressure of an exhaust port of the compressors is more than or equal to 2.4MPa, the pressure switches are disconnected, an explosion-proof compressor system is powered off simultaneously, when the pressure of the exhaust port of the compressors is less than or equal to 2MPa, an alarm is manually reset on a controller in the explosion-proof electrical control box, the pressure switches are reset, and the explosion-proof compressor system is restored to be normal;
the low-pressure protection control method of the compressor comprises the following steps: the method comprises the steps that two CK-type pressure switches are adopted to connect the compressors in series into an explosion-proof electrical control box, the pressure switches are in a closed state in a normal state, when the pressure of an exhaust port of the compressors is less than or equal to 0.05MPa, the pressure switches are disconnected, an explosion-proof compressor system is powered off simultaneously, when the pressure of the exhaust port of the compressors is more than or equal to 0.15MPa, an alarm is manually reset on a controller in the explosion-proof electrical control box, the pressure switches are reset, and the explosion-proof compressor system is restored to be normal;
when a temperature sensor arranged at the exhaust port of the compressor senses that the temperature of the exhaust port of the compressor reaches 98 ℃, the explosion-proof compressor system stops working, and the explosion-proof compressor system returns to normal after manual reset;
(2) The control method of the explosion-proof centrifugal fan comprises the following steps:
when the explosion-proof motor is electrified, the antistatic belt and the impeller rotate simultaneously, a wind pressure differential pressure switch arranged at the air outlet of the explosion-proof centrifugal fan detects wind pressure, the explosion-proof centrifugal fan operates normally, when the explosion-proof motor is electrified, the antistatic belt and the impeller do not rotate in a fault state, the wind pressure differential pressure switch arranged at the air outlet of the explosion-proof centrifugal fan does not detect wind pressure, and a controller in an explosion-proof electric control box immediately stops the power supply of the explosion-proof motor;
(3) The indoor positive pressure control method comprises the following steps:
1) The indoor positive pressure range is 25-70Pa;
2) When the explosion-proof air conditioner normally operates, the first explosion-proof centrifugal fan and the first explosion-proof electric air valve are started, the explosion-proof compressor system is started, when the indoor positive pressure cannot meet the requirement, the second explosion-proof centrifugal fan is started, when the indoor positive pressure cannot be ensured after the first explosion-proof centrifugal fan and the second explosion-proof centrifugal fan are simultaneously started, the second explosion-proof electric air valve is started, and if the indoor positive pressure requirement cannot be met, an audible and visual alarm installed on the explosion-proof air conditioner alarms;
3) When the door is opened, a door opening and closing buzzer installed in the explosion-proof electric control box gives an alarm after a period of time delay, and when the door is closed, the door opening and closing buzzer stops giving an alarm;
4) When the door is opened, the explosion-proof compressor system normally operates, after a period of time, the second explosion-proof centrifugal fan and the second explosion-proof electric air valve are opened to convey fresh air indoors, so that air quantity of 0.3m/s is ensured to be output indoors to outdoors, when the door is closed, the indoor positive pressure reaches 70Pa, and when the second explosion-proof centrifugal fan and the second explosion-proof electric air valve are closed;
5) When the first explosion-proof centrifugal fan fails, the operation of the explosion-proof compressor system is stopped, and the second explosion-proof centrifugal fan and the second explosion-proof electric air valve are opened to ensure indoor positive pressure.
7. The control method of the IECEx explosion-proof air conditioner according to claim 6, wherein:
in the step 3) of the indoor positive pressure control method, when a door is opened, a door switch buzzer arranged in an explosion-proof electric control box gives an alarm after a delay of 30 seconds;
in the step 4) of the indoor positive pressure control method, when the door is opened, the explosion-proof compressor system normally operates, and after time delay is 10 seconds, the second explosion-proof centrifugal fan and the second explosion-proof electric air valve are opened to convey fresh air into the room.
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