A triphenylphosphine workshop anti-corrosion and explosion-proof ventilation system and control method

Abstract

The invention discloses a triphenylphosphine workshop anti-corrosion and explosion-proof ventilation system, which belongs to the technical field of triphenylphosphine production. The invention discloses a triphenylphosphine workshop anti-corrosion and explosion-proof ventilation system, and provides emergency ventilation when a dangerous flammable gas leaks. The power supplies of a secondary circuit and a control circuit are connected to the power supply of a primary circuit. The first normally open contact of a three-phase intermediate relay is connected in parallel with a three-phase thermal relay. A selection switch of the secondary circuit, a second normally open contact of a first intermediate relay and a first signal lamp are connected in series in sequence and then connected to the power supply through a first miniature circuit breaker. A dangerous flammable gas leakage detection switch of a control circuit is connected in series with a coil of a first intermediate relay and then connected to the power supply through a second miniature circuit breaker. The control method includes indoor start and emergency stop of a fan, outdoor start and emergency stop of a fan, emergency exhaust start of a fan and an alarm for a fan overload fault. The ventilation is good and the anti-corrosion and explosion-proof requirements of a workshop are met. When a dangerous flammable gas leaks, an axial flow fan is forced to start and emergency ventilation is performed, thereby reducing potential safety hazards.

Description

Technical Field

[0001] The invention belongs to the technical field of triphenylphosphine production, and in particular relates to an anti-corrosion and explosion-proof ventilation system for a triphenylphosphine workshop and a control method. Background Art

[0002] Triphenylphosphine is the basic raw material of rhodium phosphine complex catalyst. It has a wide range of uses in domestic petrochemical industry. Triphenylphosphine is also used in the pharmaceutical industry, organic synthesis, analysis and other fields. Triphenylphosphine can also be used as a brightener in dye technology, polymer polymerization, antioxidant for color film development, stabilizer for polyepoxidation, and analytical reagent. It is an important raw material in the pharmaceutical, petrochemical, coating, rubber and other industries.

[0003] The production workshop of triphenylphosphine contains a large number of flammable, explosive and corrosive raw materials, mainly including toluene, methanol, tetrahydrofuran, chlorobenzene, ethyl bromide, butyl bromide, n-butanol, boric acid, N,N-dimethylformamide, 1,4-dibromobutane, anhydrous dipotassium hydrogen phosphate, anhydrous sodium acetate, liquid alkali, dichloromethane, etc. These raw materials are extremely flammable and highly corrosive. In addition, the production workshop of triphenylphosphine also contains a large number of flammable and explosive dust substances, such as magnesium chips, calcium chloride, caustic soda flakes, activated carbon, etc., which belong to a highly corrosive and explosive gas environment.

[0004] In the prior art, a Chinese invention patent application with application publication number CN111102696A and application publication date May 5, 2020 discloses a factory workshop ventilation automatic control system, including a temperature sensor, a dust sensor, an A / D conversion module, a central processing unit, a storage module, a display module, a relay and a ventilation device. The temperature sensor and the dust sensor are respectively connected to the central processing unit through the A / D conversion module, and the storage module and the display module are respectively connected to the central processing unit, and the central processing unit controls the start and stop of the ventilation device through a relay.

[0005] Although the system can automatically detect the temperature and dust concentration in the factory workshop and automatically open the ventilation device for ventilation according to the detected parameters, the above system is not suitable for the ventilation of the triphenylphosphine production workshop in an anti-corrosion and explosion-proof environment.

[0006] Therefore, the production workshop of triphenylphosphine needs to have good ventilation. These ventilation equipment and auxiliary equipment need to meet the anti-corrosion and explosion-proof requirements of the workshop. When a dangerous flammable gas leak is detected in the workshop, all ventilation equipment needs to be forced to open. Therefore, this puts high demands on the ventilation design of the workshop. Summary of the invention

[0007] The technical problem to be solved by the present invention is how to ventilate a triphenylphosphine production workshop in an anti-corrosion and explosion-proof environment and to solve the emergency ventilation problem when leakage of dangerous flammable gas is detected in the workshop.

[0008] The present invention solves the above technical problems through the following technical solutions.

[0009] A triphenylphosphine workshop anti-corrosion and explosion-proof ventilation system comprises a primary circuit, a secondary circuit and a control circuit. The 220V AC power supply of the secondary circuit and the control circuit is connected to any one phase voltage of the 380V AC power supply of the primary circuit; the input end of the three-phase low-voltage circuit breaker (1) of the primary circuit is connected to the 380V AC power supply, and the output end is connected to the main contact (2) of the three-phase AC contactor; the three-phase low-voltage circuit breaker (1), the main contact (2) of the three-phase AC contactor, the three-phase thermal relay (3) and the axial flow fan (4) are connected in series in sequence; the first normally open contact (5) of the three-phase intermediate relay is connected in parallel with the three-phase thermal relay (3); the selection switch (6) of the secondary circuit and the first intermediate relay The second normally open contact (13) of the control circuit and the first signal light (16) are connected in series in sequence, wherein the selection switch (6) is connected to the live wire of the 220V AC power supply through the first miniature circuit breaker (18), and the first signal light (16) is connected to the neutral wire of the 220V AC power supply through the first miniature circuit breaker (18); the dangerous flammable gas leakage detection switch (23) of the control circuit is connected in series with the first intermediate relay coil (24), wherein the dangerous flammable gas leakage detection switch (23) is connected to the live wire of the 220V AC power supply through the second miniature circuit breaker (21), and the first intermediate relay coil (24) is connected to the neutral wire of the 220V AC power supply through the second miniature circuit breaker (21).

[0010] By designing the corrosion-proof and explosion-proof primary circuit, secondary circuit and control circuit of the axial flow fan, the production workshop of triphenylphosphine is well ventilated and meets the corrosion-proof and explosion-proof requirements of the workshop. The first normally open contact of the three-phase intermediate relay of the primary circuit is designed to be connected in parallel with the three-phase thermal relay; the selection switch of the secondary circuit, the second normally open contact of the first intermediate relay, and the first signal light are connected in series in sequence and then connected to the 220V AC power supply through the first miniature circuit breaker; the dangerous flammable gas leakage detection switch of the control circuit is connected in series with the first intermediate relay coil and then connected to the 220V AC power supply through the second miniature circuit breaker. When the dangerous flammable gas leakage detector detects that the concentration of flammable gas inside the workshop exceeds the standard, the axial flow fan of the workshop is forced to start and emergency ventilation is performed. At the same time, the 220V AC power supply of the control circuit is drawn from any phase voltage of the 380V AC power supply, and there is no need to set up a separate 220V AC power distribution box, which reduces the power supply points on the workshop site and reduces safety hazards.

[0011] As a further improvement of the technical solution of the present invention, the selection switch (6), indoor starting anti-corrosion and explosion-proof operating column (7), indoor emergency stop anti-corrosion and explosion-proof operating column (8), outdoor emergency stop anti-corrosion and explosion-proof operating column (9), and three-phase AC contactor coil (10) of the secondary circuit are connected in series in sequence, wherein the selection switch (6) is connected to the live wire of the 220V AC power supply through the first miniature circuit breaker (18), and the three-phase AC contactor coil (10) is connected to the neutral wire of the 220V AC power supply through the first miniature circuit breaker (18); the outdoor starting anti-corrosion and explosion-proof operating column (11), the normally open contact (12) of the three-phase AC contactor, and the second normally open contact (13) of the first intermediate relay of the secondary circuit are connected in parallel, one end of which is connected to the series common point of the selection switch (6) and the indoor starting anti-corrosion and explosion-proof operating column (7), and the other end is connected to the series common point of the indoor starting anti-corrosion and explosion-proof operating column (7) and the indoor emergency stop anti-corrosion and explosion-proof operating column (8). point; the selection switch (6) of the secondary circuit, the second normally open contact (13) of the first intermediate relay, and the first signal lamp (16) are sequentially connected in series and then connected to the 220V AC power supply through the first miniature circuit breaker (18); the start indicator lamp (14) of the indoor anti-corrosion and explosion-proof operation column of the secondary circuit and the start indicator lamp (15) of the outdoor anti-corrosion and explosion-proof operation column are connected in parallel, one end of which is connected to the series common point of the indoor start anti-corrosion and explosion-proof operation column (7) and the indoor emergency stop anti-corrosion and explosion-proof operation column (8), and the other end is connected to the 220V AC power supply through the first miniature circuit breaker (18); the normally closed contact (19) of the three-phase AC contactor of the secondary circuit is connected in series with the second signal lamp (17), wherein the normally closed contact (19) of the three-phase AC contactor is connected to the live wire of the 220V AC power supply through the first miniature circuit breaker (18), and the second signal lamp (17) is connected to the neutral wire of the 220V AC power supply through the first miniature circuit breaker (18).

[0012] As a further improvement of the technical solution of the present invention, the two ends of the third signal light (22) of the control circuit are connected to the 220V AC power supply through the second miniature circuit breaker (21); the three-phase thermal relay normally open contact (25) of the control circuit is connected in series with the fourth signal light (26), wherein the three-phase thermal relay normally open contact (25) is connected to the live wire of the 220V AC power supply through the second miniature circuit breaker (21), and the fourth signal light (26) is connected to the neutral wire of the 220V AC power supply through the second miniature circuit breaker (21); the second intermediate The normally closed contact (27) of the relay is connected in series with the alarm bell (28), and one end is connected to the common point of the normally open contact (25) of the three-phase thermal relay and the fourth signal light (26), and the other end is connected to the 220V AC power supply through the second miniature circuit breaker (21); the alarm elimination anti-corrosion and explosion-proof operating column (29) of the control circuit is connected in series with the second intermediate relay coil (30), and one end is connected to the common point of the normally open contact (25) of the three-phase thermal relay and the fourth signal light (26), and the other end is connected to the 220V AC power supply through the second miniature circuit breaker (21).

[0013] As a further improvement of the technical solution of the present invention, the selection switch (6), the indoor starting anti-corrosion and explosion-proof operating column (7), the indoor emergency stop anti-corrosion and explosion-proof operating column (8), and the starting indicator light (14) of the indoor anti-corrosion and explosion-proof operating column are centrally installed in an indoor anti-corrosion and explosion-proof button box, and the outdoor emergency stop anti-corrosion and explosion-proof operating column (9), the outdoor starting anti-corrosion and explosion-proof operating column (11), and the starting indicator light (15) of the outdoor anti-corrosion and explosion-proof operating column are centrally installed in an outdoor anti-corrosion and explosion-proof button box.

[0014] As a further improvement of the technical solution of the present invention, the model of the anti-corrosion and explosion-proof button box is BZC8060-A2D1K1G. This model of button box is suitable for hazardous environments involving explosive dust, explosive gas and corrosive chemicals, ensuring the safety of ventilation and exhaust in the triphenylphosphine production workshop.

[0015] As a further improvement of the technical solution of the present invention, the axial flow fan (4) adopts a CBF-400 type anti-corrosion and explosion-proof side wall axial flow fan.

[0016] As a further improvement of the technical solution of the present invention, the miniature circuit breaker adopts a miniature circuit breaker of model S201M-C6.

[0017] A control method for the anti-corrosion and explosion-proof ventilation system of a triphenylphosphine workshop, comprising the following steps:

[0018] Step 1: Indoor start and emergency stop of the fan; turn the selection switch (6) to the indoor start position, press the indoor start anti-corrosion and explosion-proof operation column (7), the three-phase AC contactor coil (10) is energized, the three-phase AC contactor main contact (2) is closed, and the axial flow fan (4) is running; at this time, the three-phase AC contactor normally open contact (12) is attracted for self-protection, the start indicator light (14) and the first signal light (16) of the indoor anti-corrosion and explosion-proof operation column are lit, the three-phase AC contactor normally closed contact (19) is disconnected, and the second signal light (17) is extinguished, which is used to prompt the workshop site The axial flow fan is in operation; when an emergency occurs at the workshop site, the indoor emergency stop anti-corrosion and explosion-proof operation column (8) is pressed, the three-phase AC contactor coil (10) loses power, the three-phase AC contactor main contact (2) is disconnected, and the axial flow fan (4) stops running. At this time, the start indicator light (14) and the first signal light (16) of the indoor anti-corrosion and explosion-proof operation column are extinguished. At the same time, the normally closed contact (19) of the three-phase AC contactor is closed, and the second signal light (17) is lit, which is used to remind the workshop site and the machine side that the axial flow fan (4) is in a stopped state;

[0019] Step 2: outdoor start and emergency stop of the fan; turn the selection switch (6) to the outdoor start position, press the outdoor start anti-corrosion and explosion-proof operation column (11), the three-phase AC contactor coil (10) is energized, the three-phase AC contactor main contact (2) is closed, and the axial flow fan (4) is running; at this time, the three-phase AC contactor normally open contact (12) is attracted for self-protection, the start indicator light (15) and the first signal light (16) of the outdoor anti-corrosion and explosion-proof operation column are lit, the three-phase AC contactor normally closed contact (19) is disconnected, and the second signal light (17) is extinguished, which is used to prompt the workshop that the workshop is in a state of emergency. The axial flow fan is in operation; when an emergency occurs at the workshop site, the outdoor emergency stop anti-corrosion and explosion-proof operation column (9) is pressed, the three-phase AC contactor coil (10) loses power, the three-phase AC contactor main contact (2) is disconnected, and the axial flow fan (4) stops running. At this time, the start indicator light (15) and the first signal light (16) of the outdoor anti-corrosion and explosion-proof operation column are extinguished. At the same time, the normally closed contact (19) of the three-phase AC contactor is closed, and the second signal light (17) is lit, which is used to remind the workshop site and the machine side that the axial flow fan (4) is in a stopped state;

[0020] Step three, the fan emergency exhaust is started; when the dangerous combustible gas leak detector detects that the concentration of combustible gas inside the workshop exceeds the standard, the dangerous combustible gas leak detection switch (23) is closed, the first intermediate relay coil (24) is energized, the first normally open contact (5) of the first intermediate relay is closed, and the axial flow fan (4) is automatically operated in an emergency to discharge the combustible gas inside the workshop. At the same time, the second normally open contact (13) of the first intermediate relay is closed, and the first signal light (16) is lit to indicate that the axial flow fan (4) is in an emergency exhaust state;

[0021] Step 4, fan overload fault alarm; when the axial flow fan (4) is overloaded, the three-phase thermal relay (3) detects that the temperature exceeds the standard, the coil of the three-phase thermal relay (3) is energized, the normally open contact (25) of the three-phase thermal relay is closed, the fourth signal light (26) is lit, and the alarm (28) sounds an alarm, prompting the on-site operator to go and handle it; when the fault is eliminated, the alarm elimination anti-corrosion and explosion-proof operating column (29) is pressed, the second intermediate relay coil (30) is energized, the normally closed contact (27) of the second intermediate relay is disconnected, and the alarm of the alarm (28) is eliminated.

[0022] The advantages of the present invention are:

[0023] (1) By designing the primary circuit, secondary circuit and control circuit of the axial flow fan to be corrosion-proof and explosion-proof, the triphenylphosphine production workshop is well ventilated and meets the corrosion-proof and explosion-proof requirements of the workshop. The first normally open contact of the three-phase intermediate relay of the primary circuit is designed to be connected in parallel with the three-phase thermal relay; the selection switch of the secondary circuit, the second normally open contact of the first intermediate relay and the first signal light are connected in series in sequence and then connected to the 220V AC power supply through the first miniature circuit breaker; the dangerous flammable gas leakage detection switch of the control circuit is connected in series with the first intermediate relay coil and then connected to the 220V AC power supply through the second miniature circuit breaker. When the dangerous flammable gas leakage detector detects that the concentration of the flammable gas inside the workshop exceeds the standard, the axial flow fan (4) of the workshop is forced to start emergency ventilation. At the same time, the 220V AC power supply of the control circuit is drawn from any phase voltage of the 380V AC power supply, and there is no need to set up a separate 220V AC power distribution box, which reduces the power supply points on the workshop site and reduces safety hazards.

[0024] (2) The selection switch, the emergency stop anti-corrosion and explosion-proof operating column, the start anti-corrosion and explosion-proof operating column, and the start indicator light of the anti-corrosion and explosion-proof operating column next to the machine are installed together in the anti-corrosion and explosion-proof button box, which facilitates the control of the axial flow fan while reducing the safety impact of the dispersed layout of the components on the production workshop.

[0025] (3) The model of the anti-corrosion and explosion-proof button box is BZC8060-A2D1K1G. This model of button box is suitable for hazardous environments with explosive dust, explosive gas and corrosive chemicals, ensuring the safety of ventilation and exhaust in the triphenylphosphine production workshop.

[0026] (4) The axial flow fan adopts the CBF-400 anti-corrosion and explosion-proof side wall axial flow fan with a rated power of 0.37kW. This type of axial flow fan is suitable for hazardous environments with explosive dust, explosive gas and corrosive chemicals, and has the advantages of high wind speed and low noise.

[0027] (5) The miniature circuit breaker used is the S201M-C6 model, which has anti-corrosion and explosion-proof functions and is suitable for hazardous environments involving explosive dust, explosive gas, and corrosive chemicals. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A primary circuit schematic diagram of a triphenylphosphine workshop anti-corrosion and explosion-proof ventilation system according to an embodiment of the present invention;

[0029] Figure 2 A secondary circuit schematic diagram of a triphenylphosphine workshop anti-corrosion and explosion-proof ventilation system according to an embodiment of the present invention;

[0030] Figure 3A control circuit schematic diagram of a triphenylphosphine workshop anti-corrosion and explosion-proof ventilation system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0033] Embodiment 1

[0034] like Figure 1-3 As shown, a triphenylphosphine workshop anti-corrosion and explosion-proof ventilation system comprises a three-phase low-voltage circuit breaker 1, a three-phase AC contactor main contact 2, a three-phase thermal relay 3, an axial flow fan 4, a first normally open contact 5 of a first intermediate relay, a first miniature circuit breaker 18, a selection switch 6, an indoor start anti-corrosion and explosion-proof operating column 7, an indoor emergency stop anti-corrosion and explosion-proof operating column 8, an outdoor emergency stop anti-corrosion and explosion-proof operating column 9, a three-phase AC contactor coil 10, an outdoor start anti-corrosion and explosion-proof operating column 11, a three-phase AC contactor normally open contact 12, and a second normally open contact of the first intermediate relay. Point 13, start indicator light 14 of indoor anti-corrosion and explosion-proof operating column, start indicator light 15 of outdoor anti-corrosion and explosion-proof operating column, first signal light 16, second signal light 17, normally closed contact of three-phase AC contactor 19, second miniature circuit breaker 21, third signal light 22, dangerous flammable gas leakage detection switch 23, first intermediate relay coil 24, normally open contact 25 of three-phase thermal relay, fourth signal light 26, normally closed contact of second intermediate relay 27, alarm bell 28, alarm elimination anti-corrosion and explosion-proof operating column 29, second intermediate relay coil 30.

[0035] like Figure 1 As shown, the input end of the three-phase low-voltage circuit breaker 1 is connected to a 380V AC power supply, and the output end is connected to a three-phase AC contactor main contact 2. The three-phase low-voltage circuit breaker 1, the three-phase AC contactor main contact 2, the three-phase thermal relay 3, and the axial flow fan 4 are connected in series in sequence, and the first normally open contact 5 of the three-phase intermediate relay is connected in parallel with the three-phase thermal relay 3.

[0036] like Figure 2As shown, the selection switch 6, the indoor starting anti-corrosion and explosion-proof operating column 7, the indoor emergency stop anti-corrosion and explosion-proof operating column 8, the outdoor emergency stop anti-corrosion and explosion-proof operating column 9, and the three-phase AC contactor coil 10 are connected in series in sequence, wherein the selection switch 6 is connected to the live wire of the 220V AC power supply through the first miniature circuit breaker 18, and the three-phase AC contactor coil 10 is connected to the neutral wire of the 220V AC power supply through the first miniature circuit breaker 18; the outdoor starting anti-corrosion and explosion-proof operating column 11, the three-phase AC contactor normally open contact 12, and the second normally open contact 13 of the first intermediate relay are connected in parallel, and one end is connected to the series common point of the selection switch 6 and the indoor starting anti-corrosion and explosion-proof operating column 7, and the other end is connected to the series common point of the indoor starting anti-corrosion and explosion-proof operating column 7 and the indoor emergency stop anti-corrosion and explosion-proof operating column 8; the starting of the indoor anti-corrosion and explosion-proof operating column After the indicator light 14 is connected in parallel with the start indicator light 15 of the outdoor anti-corrosion and explosion-proof operating column, one end is connected to the series common point of the indoor start anti-corrosion and explosion-proof operating column 7 and the indoor emergency stop anti-corrosion and explosion-proof operating column 8, and the other end is connected to the 220V AC power supply through the first miniature circuit breaker 18; one end of the first signal light 16 is connected to the series common point of the indoor start anti-corrosion and explosion-proof operating column 7 and the indoor emergency stop anti-corrosion and explosion-proof operating column 8, and the other end is connected to the 220V AC power supply through the first miniature circuit breaker 18; the three-phase AC contactor normally closed contact 19 is connected in series with the second signal light 17, wherein the three-phase AC contactor normally closed contact 19 is connected to the live wire of the 220V AC power supply through the first miniature circuit breaker 18, and the second signal light 17 is connected to the neutral wire of the 220V AC power supply through the first miniature circuit breaker 18.

[0037] like Figure 3 As shown, both ends of the third signal light 22 are connected to the 220V AC power supply through the second miniature circuit breaker 21; the dangerous combustible gas leakage detection switch 23 is connected in series with the first intermediate relay coil 24, wherein the dangerous combustible gas leakage detection switch 23 is connected to the live wire of the 220V AC power supply through the second miniature circuit breaker 21, and the first intermediate relay coil 24 is connected to the neutral wire of the 220V AC power supply through the second miniature circuit breaker 21; the three-phase thermal relay normally open contact 25 is connected in series with the fourth signal light 26, wherein the three-phase thermal relay normally open contact 25 is connected to the 220V AC power supply through the second miniature circuit breaker 21. The fourth signal light 26 is connected to the live wire of the 220V AC power supply through the second miniature circuit breaker 21; the second intermediate relay normally closed contact 27 and the alarm bell 28 are connected in series, and one end is connected to the series common point of the three-phase thermal relay normally open contact 25 and the fourth signal light 26, and the other end is connected to the 220V AC power supply through the second miniature circuit breaker 21; the alarm elimination anti-corrosion and explosion-proof operating column 29 is connected in series with the second intermediate relay coil 30, and one end is connected to the series common point of the three-phase thermal relay normally open contact 25 and the fourth signal light 26, and the other end is connected to the 220V AC power supply through the second miniature circuit breaker 21.

[0038] The selection switch 6, the indoor start anti-corrosion and explosion-proof operating column 7, the indoor emergency stop anti-corrosion and explosion-proof operating column 8, and the start indicator light 14 of the indoor anti-corrosion and explosion-proof operating column are centrally installed in the indoor anti-corrosion and explosion-proof button box, and the outdoor emergency stop anti-corrosion and explosion-proof operating column 9, the outdoor start anti-corrosion and explosion-proof operating column 11, and the start indicator light 15 of the outdoor anti-corrosion and explosion-proof operating column are centrally installed in the outdoor anti-corrosion and explosion-proof button box, which facilitates the control of the axial flow fan 4 while reducing the safety impact of the dispersed arrangement of components on the production workshop.

[0039] The 220V AC power supply is derived from any phase voltage of the 380V AC power supply, and there is no need to set up a separate 220V AC power distribution box, which reduces the power supply points on the workshop site and reduces safety hazards.

[0040] The model of the anti-corrosion and explosion-proof button box is BZC8060-A2D1K1G. This model of button box is suitable for hazardous environments involving explosive dust, explosive gas and corrosive chemicals, ensuring the safety of ventilation and exhaust in the triphenylphosphine production workshop.

[0041] The axial flow fan 4 adopts the CBF-400 anti-corrosion and explosion-proof side wall axial flow fan with a rated power of 0.37 kW. This type of axial flow fan is suitable for hazardous environments involving explosive dust, explosive gas and corrosive chemicals, and has the advantages of high wind speed and low noise.

[0042] The miniature circuit breaker is a S201M-C6 miniature circuit breaker, which has the functions of corrosion resistance and explosion resistance and is suitable for hazardous environments involving explosive dust, explosive gas and corrosive chemicals.

[0043] 1) Indoor start and emergency stop of the fan: turn the selection switch 6 to the indoor start position, press the indoor start anti-corrosion and explosion-proof operating column 7, the three-phase AC contactor coil 10 is energized, the three-phase AC contactor main contact 2 is closed, and the axial flow fan 4 starts; at this time, the three-phase AC contactor normally open contact 12 is attracted for self-protection, the start indicator light 14 and the first signal light 16 of the indoor anti-corrosion and explosion-proof operating column light up, the three-phase AC contactor normally closed contact 19 is disconnected, and the second signal light 17 is off, which is used to prompt that the axial flow fan on site in the workshop is in operation.

[0044] When an emergency occurs at the workshop, the indoor emergency stop anti-corrosion and explosion-proof operating column 8 is pressed, the three-phase AC contactor coil 10 loses power, the three-phase AC contactor main contact 2 is disconnected, and the axial flow fan 4 stops running. At this time, the start indicator light 14 and the first signal light 16 of the indoor anti-corrosion and explosion-proof operating column go out. At the same time, the normally closed contact 19 of the three-phase AC contactor is closed, and the second signal light 17 lights up, which is used to prompt that the workshop and the machine are in a stopped state.

[0045] 2) Outdoor start and emergency stop of the fan: turn the selection switch 6 to the outdoor start position, press the outdoor start anti-corrosion and explosion-proof operating column 11, the three-phase AC contactor coil 10 is energized, the three-phase AC contactor main contact 2 is closed, and the axial flow fan 4 starts; at this time, the three-phase AC contactor normally open contact 12 is attracted for self-protection, the start indicator light 15 and the first signal light 16 of the outdoor anti-corrosion and explosion-proof operating column light up, the three-phase AC contactor normally closed contact 19 is disconnected, and the second signal light 17 is off, which is used to prompt that the axial flow fan on site in the workshop is in operation.

[0046] When an emergency occurs at the workshop, the outdoor emergency stop anti-corrosion and explosion-proof operating column 9 is pressed, the three-phase AC contactor coil 10 loses power, the three-phase AC contactor main contact 2 is disconnected, and the axial flow fan 4 stops running. At this time, the start indicator light 15 and the first signal light 16 of the outdoor anti-corrosion and explosion-proof operating column go out. At the same time, the normally closed contact 19 of the three-phase AC contactor is closed, and the second signal light 17 lights up, which is used to prompt that the workshop and the machine are in a stopped state.

[0047] 3) Emergency exhaust start of the fan: When the dangerous flammable gas leak detector detects that the concentration of flammable gas inside the workshop exceeds the standard, the dangerous flammable gas leak detection switch 23 is closed, the first intermediate relay coil 24 is energized, the first normally open contact 5 of the first intermediate relay is closed, and the axial flow fan 4 automatically operates in an emergency to discharge the flammable gas inside the workshop. At the same time, the second normally open contact 13 of the first intermediate relay is closed, and the first signal light 16 is on to indicate that the axial flow fan 4 is in an emergency exhaust state.

[0048] 4) Fan overload fault alarm: When the axial flow fan 4 is overloaded, the three-phase thermal relay 3 detects that the temperature exceeds the standard, the coil of the three-phase thermal relay 3 is energized, the normally open contact 25 of the three-phase thermal relay is closed, the fourth signal light 26 lights up, and the alarm 28 sounds an alarm, prompting the on-site operator to go and deal with it; when the fault is eliminated, press the alarm elimination anti-corrosion and explosion-proof operating column 29, the second intermediate relay coil 30 is energized, the normally closed contact 27 of the second intermediate relay is disconnected, and the alarm of the alarm 28 is eliminated.

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A triphenylphosphine workshop anti-corrosion and explosion-proof ventilation system, characterized in that: The invention comprises a primary circuit, a secondary circuit and a control circuit. The 220V AC power supply of the secondary circuit and the control circuit is connected to any one phase voltage of the 380V AC power supply of the primary circuit. The input end of the three-phase low-voltage circuit breaker (1) of the primary circuit is connected to the 380V AC power supply, and the output end is connected to the main contact (2) of the three-phase AC contactor. The three-phase low-voltage circuit breaker (1), the main contact (2) of the three-phase AC contactor, the three-phase thermal relay (3) and the axial flow fan (4) are connected in series in sequence. The first normally open contact (5) of the three-phase intermediate relay is connected in parallel with the three-phase thermal relay (3). The selection switch (6) of the secondary circuit and the second normally open contact ( 13), the first signal lamp (16) is connected in series in sequence, wherein the selection switch (6) is connected to the live wire of the 220V AC power supply through the first miniature circuit breaker (18), and the first signal lamp (16) is connected to the neutral wire of the 220V AC power supply through the first miniature circuit breaker (18); the dangerous flammable gas leakage detection switch (23) of the control circuit is connected in series with the first intermediate relay coil (24), wherein the dangerous flammable gas leakage detection switch (23) is connected to the live wire of the 220V AC power supply through the second miniature circuit breaker (21), and the first intermediate relay coil (24) is connected to the neutral wire of the 220V AC power supply through the second miniature circuit breaker (21); The selection switch (6), indoor anti-corrosion and explosion-proof operation column (7), indoor emergency stop anti-corrosion and explosion-proof operation column (8), outdoor emergency stop anti-corrosion and explosion-proof operation column (9), and three-phase AC contactor coil (10) of the secondary circuit are sequentially connected in series, wherein the selection switch (6) is connected to the live wire of the 220V AC power supply through the first miniature circuit breaker (18), and the three-phase AC contactor coil (10) is connected to the neutral wire of the 220V AC power supply through the first miniature circuit breaker (18); the outdoor anti-corrosion and explosion-proof operation column (11), the normally open contact (12) of the three-phase AC contactor, and the second normally open contact (13) of the first intermediate relay of the secondary circuit are connected in parallel, and one end is connected to the series common point of the selection switch (6) and the indoor anti-corrosion and explosion-proof operation column (7), and the other end is connected to the series common point of the indoor anti-corrosion and explosion-proof operation column (7) and the indoor emergency stop anti-corrosion and explosion-proof operation column (8); the selection switch (6) of the secondary circuit is connected to the live wire of the 220V AC power supply through the first miniature circuit breaker (18), and the three-phase AC contactor coil (10) is connected to the neutral wire of the 220V AC power supply through the first miniature circuit breaker (18); the outdoor anti-corrosion and explosion-proof operation column (11), the normally open contact (12) of the three-phase AC contactor, and the second normally open contact (13) of the first intermediate relay are connected in parallel, and one end is connected to the series common point of the selection switch (6) and the indoor anti-corrosion and explosion-proof operation column (7), and the other end is connected to the series common point of the indoor anti-corrosion and explosion-proof operation column (7) and the indoor emergency stop anti-corrosion and explosion-proof operation column (8); The selector switch (6), the second normally open contact (13) of the first intermediate relay, and the first signal lamp (16) are sequentially connected in series and then connected to a 220V AC power supply through a first miniature circuit breaker (18); a start indicator lamp (14) of an indoor anti-corrosion and explosion-proof operating column and a start indicator lamp (15) of an outdoor anti-corrosion and explosion-proof operating column of a secondary circuit are connected in parallel, and one end is connected to a common point of the series connection of an indoor start anti-corrosion and explosion-proof operating column (7) and an indoor emergency stop anti-corrosion and explosion-proof operating column (8), and the other end is connected to a 220V AC power supply through a first miniature circuit breaker (18); a normally closed contact (19) of a three-phase AC contactor of the secondary circuit is connected in series with a second signal lamp (17), wherein the normally closed contact (19) of the three-phase AC contactor is connected to a live wire of the 220V AC power supply through the first miniature circuit breaker (18), and the second signal lamp (17) is connected to a neutral wire of the 220V AC power supply through the first miniature circuit breaker (18).

2. A triphenylphosphine workshop anticorrosion and explosion-proof ventilation system according to claim 1, characterized in that: The two ends of the third signal light (22) of the control circuit are connected to the 220V AC power supply through the second miniature circuit breaker (21); the three-phase thermal relay normally open contact (25) of the control circuit is connected in series with the fourth signal light (26), wherein the three-phase thermal relay normally open contact (25) is connected to the live wire of the 220V AC power supply through the second miniature circuit breaker (21), and the fourth signal light (26) is connected to the neutral wire of the 220V AC power supply through the second miniature circuit breaker (21); the second intermediate relay normally closed contact ( 27) is connected in series with the alarm bell (28), one end of which is connected to the common point of the series connection of the normally open contact of the three-phase thermal relay (25) and the fourth signal light (26), and the other end is connected to the 220V AC power supply through the second miniature circuit breaker (21); the alarm elimination anti-corrosion and explosion-proof operating column (29) of the control circuit is connected in series with the second intermediate relay coil (30), one end of which is connected to the common point of the series connection of the normally open contact of the three-phase thermal relay (25) and the fourth signal light (26), and the other end is connected to the 220V AC power supply through the second miniature circuit breaker (21).

3. A triphenylphosphine workshop anticorrosion and explosion-proof ventilation system according to claim 1, characterized in that: The selection switch (6), the indoor anti-corrosion and explosion-proof starting operating column (7), the indoor anti-corrosion and explosion-proof emergency stop operating column (8), and the start indicator light (14) of the indoor anti-corrosion and explosion-proof operating column are centrally installed in an indoor anti-corrosion and explosion-proof button box, and the outdoor anti-corrosion and explosion-proof emergency stop operating column (9), the outdoor anti-corrosion and explosion-proof starting operating column (11), and the start indicator light (15) of the outdoor anti-corrosion and explosion-proof operating column are centrally installed in an outdoor anti-corrosion and explosion-proof button box.

4. A triphenylphosphine workshop anti-corrosion and explosion-proof ventilation system according to claim 3, characterized in that: The model of the anti-corrosion and explosion-proof button box is BZC8060-A2D1K1G. This model of button box is suitable for hazardous environments involving explosive dust, explosive gas and corrosive chemicals, ensuring the safety of ventilation and exhaust in the triphenylphosphine production workshop.

5. A triphenylphosphine workshop anti-corrosion and explosion-proof ventilation system according to claim 1, characterized in that: The axial flow fan (4) is a CBF-400 type anti-corrosion and explosion-proof side wall axial flow fan.

6. A triphenylphosphine workshop anti-corrosion and explosion-proof ventilation system according to claim 1, characterized in that: The miniature circuit breaker is a S201M-C6 miniature circuit breaker.

7. A control method for a triphenylphosphine workshop anti-corrosion and explosion-proof ventilation system according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: indoor start and emergency stop of the fan; turn the selection switch (6) to the indoor start position, press the indoor start anti-corrosion and explosion-proof operation column (7), the three-phase AC contactor coil (10) is energized, the three-phase AC contactor main contact (2) is closed, and the axial flow fan (4) is running; at this time, the three-phase AC contactor normally open contact (12) is attracted for self-protection, the start indicator light (14) and the first signal light (16) of the indoor anti-corrosion and explosion-proof operation column are lit, the three-phase AC contactor normally closed contact (19) is disconnected, and the second signal light (17) is extinguished, which is used to indicate that the axial flow fan on site in the workshop is in operation; When an emergency occurs at the workshop site, the indoor emergency stop anti-corrosion and explosion-proof operating column (8) is pressed, the three-phase AC contactor coil (10) loses power, the three-phase AC contactor main contact (2) is disconnected, and the axial flow fan (4) stops running. At this time, the start indicator light (14) and the first signal light (16) of the indoor anti-corrosion and explosion-proof operating column are extinguished. At the same time, the normally closed contact (19) of the three-phase AC contactor is closed, and the second signal light (17) is lit, which is used to remind the workshop site and the machine side that the axial flow fan (4) is in a stopped state; Step 2: outdoor start and emergency stop of the fan; turn the selection switch (6) to the outdoor start position, press the outdoor start anti-corrosion and explosion-proof operation column (11), the three-phase AC contactor coil (10) is energized, the three-phase AC contactor main contacts (2) are closed, and the axial flow fan (4) is running; at this time, the normally open contacts (12) of the three-phase AC contactor are attracted for self-protection, the start indicator light (15) and the first signal light (16) of the outdoor anti-corrosion and explosion-proof operation column are lit, the normally closed contacts (19) of the three-phase AC contactor are disconnected, and the second signal light (17) is extinguished, which is used to prompt that the axial flow fan on site in the workshop is in operation; When an emergency occurs at the workshop site, the outdoor emergency stop anti-corrosion and explosion-proof operation column (9) is pressed, the three-phase AC contactor coil (10) loses power, the three-phase AC contactor main contact (2) is disconnected, and the axial flow fan (4) stops running. At this time, the start indicator light (15) and the first signal light (16) of the outdoor anti-corrosion and explosion-proof operation column are extinguished. At the same time, the three-phase AC contactor normally closed contact (19) is closed, and the second signal light (17) is lit, which is used to remind the workshop site and the machine side that the axial flow fan (4) is in a stopped state; Step three, the fan emergency exhaust is started; when the dangerous combustible gas leak detector detects that the concentration of combustible gas inside the workshop exceeds the standard, the dangerous combustible gas leak detection switch (23) is closed, the first intermediate relay coil (24) is energized, the first normally open contact (5) of the first intermediate relay is closed, and the axial flow fan (4) is automatically operated in an emergency to discharge the combustible gas inside the workshop. At the same time, the second normally open contact (13) of the first intermediate relay is closed, and the first signal light (16) is lit to indicate that the axial flow fan (4) is in an emergency exhaust state; Step 4, fan overload fault alarm; when the axial flow fan (4) is overloaded, the three-phase thermal relay (3) detects that the temperature exceeds the standard, the coil of the three-phase thermal relay (3) is energized, the normally open contact (25) of the three-phase thermal relay is closed, the fourth signal light (26) is lit, and the alarm (28) sounds an alarm, prompting the on-site operator to go and handle it; when the fault is eliminated, the alarm elimination anti-corrosion and explosion-proof operating column (29) is pressed, the second intermediate relay coil (30) is energized, the normally closed contact (27) of the second intermediate relay is disconnected, and the alarm of the alarm (28) is eliminated.

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