A new air preheating control circuit for marine air conditioner and a control method thereof

Abstract

The application relates to a new air preheating control circuit of a marine air conditioner and a control method thereof. The new air preheating control circuit comprises a freeze-proof main control power-on circuit, a main control preheating circuit, an auxiliary control preheating circuit, a fan start-stop circuit and a fan operation circuit which are all connected in parallel on a power supply. The new air preheating control circuit is provided with an above-freeze temperature joint temperature, a minimum freeze-proof temperature, a dangerous minimum value below the freeze temperature, three power-on temperatures, a main temperature controller, an auxiliary temperature controller, an emergency temperature controller, a respective electric heater preheating start, a ladder heating control, an auxiliary control and an emergency heating access. The new air preheating control circuit is suitable for various temperature new air occasions and can effectively avoid the impact of multiple heaters or high-power instantaneous start or simultaneous start on the heater power grid, improve the safe temperature and precision in use.

Description

TECHNICAL FIELD

[0001] The present application relates to the ship air conditioning technology, specifically, a kind of ship air conditioner fresh air preheating control circuit and its control method. BACKGROUND

[0002] The control of fresh air preheating and fan of ship air conditioner has always been a problem of ship air conditioner with fresh air, and often because of the temperature control problem of fresh air and return air mixing, air conditioner internal components failure occurs, such as coil freeze crack, electric heating dry burning, fan failure cannot emergency stop and other problems.Greatly affect the safe and stable use of air conditioner, while restricting the low temperature environment temperature range that air conditioner can be applied. SUMMARY

[0003] The present application provides a kind of ship air conditioner fresh air preheating control circuit and its control method, which can effectively monitor fresh air or new return air temperature, control heating control at the same time, ensure the safe temperature use of air conditioner.

[0004] The technical scheme adopted by the present application is: a marine air conditioner fresh air preheating control circuit, comprising a power supply, characterized in that: comprising a freeze-proof main control power-on circuit, a main control preheating circuit, an auxiliary control preheating circuit, a fan start-stop circuit and a fan running circuit which are connected in parallel on the power supply; the freeze-proof main control power-on circuit comprises a main temperature controller switch and a main temperature control power-on delay relay connected in series; the main control preheating circuit comprises a main temperature control power-on delay relay normally open switch, a main control electric heater over-temperature protection switch, a main control contactor, a heating signal switch connected in parallel on the main temperature control power-on delay relay normally open switch, and a fan running power-on delay relay connected in parallel on the main control contactor, and a contact switch of the main control contactor is arranged between the heating power supply and the main control electric heater; the fan start-stop circuit comprises a manual point-on normally open start button, a manual point-off normally closed stop button, a remote normally closed stop signal switch and a fan start-stop relay connected in series, a remote normally open start signal switch and a fan start-stop relay self-locking switch connected in parallel on the manual point-on normally open start button, and the manual point-on normally open start button, the remote normally closed stop signal switch, the remote normally open start signal switch and the manual point-off normally closed stop button are connected with the heating signal switch; the fan running circuit comprises a fan start-stop relay running normally open switch, an emergency stop signal switch, a fan thermal relay switch and a fan running contactor connected in series, a contact switch of the fan running contactor is arranged between the fan power supply and the fan, a fan running control circuit is connected in parallel on the fan start-stop relay running normally open switch, the fan running control circuit comprises a main control contactor delay normally closed contact and a fan running power-on delay relay normally open switch connected in series, the main control contactor delay normally closed contact is arranged between the heating power supply and the main control electric heater, and a fan running contactor self-locking switch is connected in parallel on the fan running power-on delay relay normally open switch; the auxiliary control preheating circuit comprises a main control contactor auxiliary control switch, an auxiliary control temperature controller switch and an auxiliary control contactor connected in series, and a contact switch of the auxiliary control contactor is arranged between the heating power supply and the auxiliary control electric heater; the main temperature controller switch and the auxiliary control temperature controller switch are respectively connected with a main temperature controller and an auxiliary control temperature controller arranged in an air conditioner fresh air outlet or a return air mixing box.

[0005] Further, a main control electric heater thyristor circuit connected in parallel on the power supply is further included, a main control electric heating thyristor is arranged on the main control electric heater thyristor circuit, the main control electric heating thyristor receives a main temperature controller signal to control connection of the main control electric heater.

[0006] Further, an auxiliary control electric heater thyristor circuit connected in parallel on the power supply is further included, an auxiliary control electric heating thyristor is arranged on the auxiliary control electric heater thyristor circuit, the auxiliary control electric heating thyristor receives an auxiliary control temperature controller signal to control connection of the auxiliary control electric heater.

[0007] Further, an emergency anti-freezing heating circuit is further included, the emergency anti-freezing heating circuit includes auxiliary control contactor delay time normally open contact, emergency temperature controller switch and emergency electric contactor which are connected in series, the contact switch of the emergency contactor is arranged between the heating power supply and the emergency electric heater, and the emergency temperature controller switch is arranged in the air conditioner fresh air outlet or the return air mixing box.

[0008] Further, an emergency electric heater thyristor circuit is further included and is connected in parallel with the power supply, an emergency electric heating thyristor is arranged on the emergency electric heater thyristor circuit, the emergency electric heating thyristor receives an emergency temperature controller signal to control the emergency electric heater.

[0009] Further, an indication lamp is connected in parallel with each contactor.

[0010] A new air preheating control method for a marine air conditioner, characterized in that the method comprises the following steps:

[0011] (1) The active heating new air mode: the manual point-by-point normally open starting button is pressed, the fan start-stop circuit is connected, the fan start-stop relay is powered, the fan start-stop relay self-locking switch is closed, the fan start-stop circuit is kept connected after the manual point-by-point normally open starting button is popped up, the fan start-stop relay running normally open switch is closed, the fan running contactor is powered, the fan running contactor self-locking switch is closed to keep the fan running control circuit and the fan running circuit connected, the fan start-stop relay running normally open switch is opened, the fan running contactor is continuously powered, the contact switch of the fan running contactor is connected to the fan power supply, and the fan runs; meanwhile, the heating signal switch is closed when the manual point-by-point normally open starting button is pressed, the main control preheating circuit is connected, the main control contactor is powered, the contact switch of the main control contactor is connected to the main control electric heater power supply, the main control electric heater is heated, the main control electric heater thyristor has no main temperature controller signal, and the main control electric heater works at full power;

[0012] The manual electrically-controlled normally closed closing button is pressed to disconnect the fan start-stop circuit, the fan start-stop relay heating signal switch is powered to open and disconnect the main control preheating circuit, the heating is stopped, the fan running power supply delay relay is powered, the fan running power supply delay relay normally open switch is opened to disconnect the fan running control circuit, the fan running circuit is disconnected, the fan running contactor is powered, and the fan is powered off;

[0013] (2) Automatic heating fresh air mode: the main temperature controller monitors the temperature range above the minimum frost temperature, and the main temperature controller switch joint temperature is set at the high value of the temperature range. The main temperature controller works in the automatic mode of air conditioner setting. When the main temperature controller detects that the outside fresh air temperature reaches the joint temperature, the main temperature controller switch joint is connected to the anti-frost main control power circuit, and the main temperature control power delay relay is powered on. Within the delay time, if the main temperature controller detects that the outside fresh air temperature exceeds the joint temperature, the main temperature control power delay relay normally open switch is not closed. If the main temperature controller detects that the outside fresh air temperature is at or below the joint temperature, the main temperature control power delay relay normally open switch is closed, connecting the main control preheating circuit, the main control contactor is powered on, the main control contactor contact switch connects the main control electric heater power supply, and the main control electric heater is heated. At this time, the main control electric heater thyristor receives the temperature signal detected by the main temperature controller, and controls the main control electric heater full power or step power work according to the temperature maintenance, drop amplitude and rate. At the same time, the fan running power delay relay of the main control preheating circuit is powered on, the fan running power delay relay normally open switch is closed to connect the fan running control circuit and the fan running circuit, the fan running contactor is powered on, the fan running contactor contact switch connects the fan power supply, and the fan runs;

[0014] (3) Auxiliary control heating fresh air: when the main temperature controller controls heating, the auxiliary control contactor auxiliary control switch is closed. When the auxiliary control temperature controller detects that the outside temperature decreases to the minimum frost temperature or a certain temperature range below the minimum frost temperature, the auxiliary control temperature controller switch connects the auxiliary control preheating circuit, the auxiliary control contactor is powered on, the auxiliary control contactor contact switch connects the auxiliary control electric heater power supply, and the auxiliary control electric heater is heated. At this time, the auxiliary control electric heater thyristor receives the temperature signal detected by the auxiliary control temperature controller, and controls the auxiliary control electric heater full power or step power work according to the temperature maintenance, drop amplitude and rate.

[0015] (4) Emergency heating fresh air: when the outside fresh air temperature is detected below the dangerous minimum value, the auxiliary control contactor is powered on, the auxiliary control contactor delay normally open contact is closed, the emergency temperature controller switch is closed, the emergency anti-frost heating circuit is connected, the emergency contactor is powered on, the emergency contactor contact switch connects the emergency electric heater power supply, and the emergency electric heater is heated. At this time, the emergency electric heater thyristor receives the temperature signal detected by the emergency temperature controller, and controls the emergency electric heater full power or step power work according to the temperature maintenance, drop amplitude and rate.

[0016] (5) Fresh air heating stop: When the main temperature controller detects that the temperature reaches above the junction temperature, the main temperature controller switch is turned off, at this time the main temperature controller power delay relay loses power, the main control contactor delay normally closed contact delays the fan operation control circuit and the fan operation circuit, the fan operation contactor controls the fan delay power off, the main control electric heater waste heat is sent into the cabin;

[0017] (6) Heating over-temperature protection: Under the condition of frequent heating of the main control electric heater, the main control electric heater over-temperature protection switch is turned off to protect the main control pre-heating circuit of the main control electric heater;

[0018] (7) Fan protection: The fan thermal relay switch is controlled by the fan or the fan shaft thermal relay in real time, and in the case of over-temperature, the fan is automatically turned off to realize the safety protection of the fan;

[0019] (8) Remote control: The remote normally open start signal switch is closed under the remote start signal, sequentially connecting the fan start-stop circuit and the fan operation circuit, and at the same time, the heating signal switch connects the main control pre-heating circuit to realize heating and air supply; the remote normally closed closing signal switch is opened under the remote closing signal, sequentially disconnecting the fan start-stop circuit and the fan operation circuit, and the heating signal switch is opened to disconnect the main control pre-heating circuit, completing the heating stop.

[0020] A new air pre-heating control method for a marine air conditioner, characterized in that it comprises the following steps:

[0021] (1) Active heating of new air mode: press the manual point-dynamic normally open start button to connect the fan start-stop circuit, the fan start-stop relay is powered on, the fan start-stop relay self-locking switch is closed, the fan start-stop circuit remains connected after the manual point-dynamic normally open start button is popped up, the fan start-stop relay running normally open switch is closed, the fan running contactor is powered on, the fan running contactor self-locking switch is closed to keep the fan running control circuit and the fan running circuit connected, the fan start-stop relay running normally open switch is opened, the fan running contactor is continuously powered on, the fan running contactor contact switch connects the fan power supply, and the fan runs; at the same time, when the manual point-dynamic normally open start button is pressed, the heating signal switch is closed to connect the main control pre-heating circuit, the main control contactor is powered on, the main control contactor contact switch connects the main control electric heater power supply, and the main control electric heater heats up, at this time the main control electric heater thyristor has no main temperature controller signal, and the main control electric heater works at full power;

[0022] Press the manual electrically-controlled normally closed closing button to disconnect the fan start-stop circuit, the heating signal switch of the fan start-stop relay is opened to disconnect the main control pre-heating circuit, the heating is stopped, the fan running power-on delay relay loses power, the fan running power-on delay relay normally open switch delays opening to disconnect the fan running control circuit, the fan running circuit is disconnected, the fan running contactor loses power, and the fan loses power;

[0023] (2) Automatic heating mixed air mode: set the main temperature controller to monitor the temperature range above the minimum freeze protection temperature, set the main temperature controller switch joint temperature of the main temperature controller at the high value of the temperature range, and set the air conditioner to automatic mode. When the main temperature controller detects that the mixed air temperature in the mixing box reaches the joint temperature, the main temperature controller switch joint turns on the freeze protection main control power circuit, and the main control power delay relay is powered on. If the main temperature controller detects that the mixed air temperature exceeds the joint temperature within the delay time, the main control power delay relay normally open switch is not closed. If the main temperature controller detects that the mixed air temperature is at or below the joint temperature, the main control power delay relay normally open switch is closed, the main control preheating circuit is turned on, the main control contactor is powered on, the main control contact switch turns on the main control electric heater power supply, and the main control electric heater is heated. At this time, the main control electric heater thyristor receives the temperature signal detected by the main temperature controller, and controls the main control electric heater full power or step power according to the temperature maintenance, drop amplitude and rate. At the same time, the fan running of the main control preheating circuit is powered on, the fan running delay relay is closed, the fan running control circuit and the fan running circuit are turned on, the fan running contactor is powered on, the fan running contact switch turns on the fan power supply, and the fan runs;

[0024] (3) Auxiliary control heating fresh air: when the main temperature controller controls heating, the main control contactor auxiliary control switch is closed. When the auxiliary temperature controller detects that the mixed air temperature decreases to the minimum freeze protection temperature or a certain temperature range below the minimum freeze protection temperature, the auxiliary control preheating circuit is turned on by the auxiliary temperature controller switch joint, the auxiliary control contactor is powered on, the auxiliary control contact switch turns on the auxiliary control electric heater power supply, and the auxiliary control electric heater is heated. At this time, the auxiliary control electric heater thyristor receives the temperature signal detected by the auxiliary temperature controller, and controls the auxiliary control electric heater full power or step power according to the temperature maintenance, drop amplitude and rate.

[0025] (4) Emergency heating fresh air: when the mixed air temperature is detected to be below the dangerous minimum value, the auxiliary control contactor is powered on, the auxiliary control contactor delay normally open contact is closed, the emergency temperature controller switch is closed, the emergency freeze protection heating circuit is turned on, the emergency contactor is powered on, the emergency contact switch turns on the emergency electric heater power supply, and the emergency electric heater is heated. At this time, the emergency electric heater thyristor receives the temperature signal detected by the emergency temperature controller, and controls the emergency electric heater full power or step power according to the temperature maintenance, drop amplitude and rate.

[0026] (5) Fresh air heating stops: when the main temperature controller detects that the temperature reaches above the junction temperature, the main temperature controller switch is turned off, at this time the main temperature controller power delay relay loses power, the main control contactor delay normally closed contact delays the fan operation control circuit and the fan operation circuit, the fan operation contactor controls the fan delay power off, and the main control electric heater waste heat is sent into the cabin;

[0027] (6) Heating over-temperature protection: under the frequent heating condition of the main control electric heater, the main control preheating circuit is turned off by the main control electric heater over-temperature protection switch to protect the main control electric heater;

[0028] (7) Fan protection: the fan thermal relay switch is controlled by the fan or the fan shaft thermal relay in real time, and in the case of over-temperature, the fan is automatically turned off to realize the safety protection of the fan;

[0029] (8) Remote control: the remote normally open start signal switch is closed under the remote start signal, and the fan start-stop circuit and the fan operation circuit are sequentially turned on, and the heating signal switch is turned on to realize the heating and air supply; the remote normally closed closing signal switch is opened under the remote closing signal, and the fan start-stop circuit and the fan operation circuit are sequentially turned off, and the heating signal switch is turned on to turn off the main control preheating circuit to complete the heating stop.

[0030] The present application has the following advantages:

[0031] (1) Anti-freezing setting of main control, auxiliary control and emergency temperature controller respectively with respective electric heating interlocking, which avoids the waiting time.

[0032] (2) The fan operation power-on delay relay is adopted to prevent the situation of forgetting to turn on the fan and leading to dry burning of the electric heating. The fan delay is controlled by the normally open switch of the fan operation power-on delay relay, and the high temperature of the electric heating residual heat is prevented.

[0033] (3) The main control electric heating thyristor adjustment control is adopted to maintain the fresh air temperature, effectively reduce the phenomenon of high and low temperature, and avoid the redundant electric heating work, thereby saving the electricity.

[0034] The present application sets the anti-freezing temperature above the junction temperature, the lowest anti-freezing temperature, the dangerous minimum value below the anti-freezing temperature, and the three power-on temperatures are started by the main temperature controller, the auxiliary temperature controller and the emergency temperature controller to preheat the respective electric heaters, and the ladder heating control and the auxiliary control and emergency heating are connected, which is suitable for various temperature fresh air occasions, and can effectively avoid the impact on the heater power grid caused by the multiple heaters or large power instantaneous start or simultaneous start, improve the safe temperature and precision. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 The present application is a circuit diagram.

[0036] In the figure: power supply AC1, main temperature controller switch WK1, main temperature control power-on delay relay KT1, main temperature control power-on delay relay normally open switch KT1-1, heating signal switch XH, main control electric heater over-temperature protection switch CW, main control contactor KM1, main control contactor delay normally closed contact KM1-1, main control contactor auxiliary control switch KM1-2, main control contactor contact switch KM1-3, heating power supply AC2, main control electric heater EH1, indicator light HL, fan operation power-on delay relay KT2, fan operation power-on delay relay normally open switch KT2-1, main control electric heater thyristor KKG, auxiliary control temperature controller switch WK2, auxiliary control contactor KM3, auxiliary control contactor delay normally open contact KM3-1, auxiliary control contactor contact switch KM3-2, auxiliary control electric heater EH2, emergency temperature controller switch WK3, emergency contactor KM4, emergency contactor contact switch KM4-1, emergency electric heater EH3, manual point-by-point normally open start button SB1, manual point-by-point normally closed stop button SB2, remote normally open start signal switch SB3, remote normally closed stop signal switch SB4, fan start-stop relay KA1, fan start-stop relay self-locking engagement switch KA1-1, fan start-stop relay operation normally open switch KA1-2, emergency stop signal switch SB5, fan thermal relay switch FR, fan operation contactor KM2, fan operation contactor self-locking engagement switch KM2-1, fan operation contactor contact switch KM2-2, fan power supply AC3, fan F. DETAILED DESCRIPTION

[0037] The application is further described below in conjunction with the accompanying drawings and examples.

[0038] Figure 1 In the illustrated embodiment, a new air preheating control circuit for a marine air conditioner is provided, in which a freeze-proof main control power-on circuit, a main control preheating circuit, a main control electric heater thyristor circuit, an auxiliary control preheating circuit, an emergency preheating circuit, a fan start-stop circuit, and a fan operation circuit are connected in parallel to the power supply AC1.

[0039] The freeze-proof main control power-on circuit comprises the main temperature controller switch WK1 and the main temperature control power-on delay relay KT1 connected in series.

[0040] The main control preheating circuit comprises a main temperature control power-on delay relay normally open switch KT1-1, a main control electric heater over-temperature protection switch CW, a main control contactor KM1, a heating signal switch XH connected in parallel with the main temperature control power-on delay relay normally open switch KT1-1, and an indicator lamp HL and a fan operation power-on delay relay KT2 connected in parallel with the main control contactor KM1, wherein the main control contactor contact switch KM1-3 is arranged between a heating power supply AC2 and the main control electric heater EH1.

[0041] The main control electric heater thyristor circuit is provided with a main control electric heating thyristor KKG, and the main control electric heating thyristor receives a main temperature controller signal to control the main control electric heater EH1.

[0042] The auxiliary control preheating circuit comprises a main control contactor auxiliary control switch KM1-2, an auxiliary control temperature controller switch WK2, and an auxiliary control contactor KM3 connected in series, and an auxiliary control contactor contact switch KM3-2 is arranged between a heating power supply and an auxiliary control electric heater EH2; the auxiliary control temperature controller of the auxiliary control temperature controller switch WK2 is arranged in an air conditioner fresh air outlet or a new return air mixing box to detect the temperature of external fresh air or new return air mixed air.

[0043] The emergency preheating circuit comprises an auxiliary control contactor auxiliary control switch KM3-1, an emergency temperature controller switch WK3, and an emergency contactor KM4 connected in series, and an emergency contactor contact switch KM4-1 is arranged between a heating power supply and an emergency electric heater EH3; the emergency temperature controller of the emergency temperature controller switch WK3 is arranged in an air conditioner fresh air outlet or a new return air mixing box to detect the temperature of external fresh air or new return air mixed air.

[0044] The fan start-stop circuit comprises a manual point-by-point normally open start button SB1, a manual point-by-point normally closed stop button SB2, a remote normally closed stop signal switch SB4, and a fan start-stop relay KA1 connected in series, and the manual point-by-point normally open start button SB1 is connected in parallel with a remote normally open start signal switch SB3 and a fan start-stop relay self-locking switch KA1-1, and the manual point-by-point normally open start button, the remote normally closed stop signal switch, the remote normally open start signal switch, and the manual point-by-point normally closed stop button are connected to an air conditioner controller to send on-off signals to the heating signal switch XH.

[0045] The fan operation circuit includes the fan start-stop relay operation normally open switch KA1-2, the emergency stop signal switch SB5, the fan thermal relay switch FR, and the fan operation contactor KM2 connected in series in sequence. The fan operation contactor contact switch KM2-2 is arranged between the fan power supply AC3 and the fan F. The fan start-stop relay operation normally open switch KA1-2 is connected in parallel with the fan operation control circuit. The fan operation control circuit includes the main control contactor delay normally closed contact KM1-1 and the fan operation power delay relay normally open switch KT2-1 connected in series in sequence. The main control contactor delay normally closed contact is arranged between the heating power supply AC2 and the main control electric heater EH1. The fan operation contactor self-locking engagement switch KM2-1 is connected in parallel with the fan operation power delay relay normally open switch.

[0046] In the following example, the main thermostat, auxiliary thermostat, and emergency thermostat are set at the fresh air outlet of the air conditioner, the antifreeze temperature is set to 2°C, the main thermostat switch junction temperature is 5°C, the minimum antifreeze temperature is 0°C, and the lowest dangerous value is -2°C.

[0047] A method for controlling fresh air preheating of a marine air conditioner comprises the following steps:

[0048] (1) Active heating fresh air mode: When the cabin personnel need heating, press the manual inching normally open start button SB1, connect the fan start and stop circuit, the fan start and stop relay KA1 is energized, and the fan start and stop relay self-locking engagement switch KA1-1 is closed. After the manual inching normally open start button is popped up, the fan start and stop circuit remains connected, the fan start and stop relay operation normally open switch KA1-2 is closed, the fan operation contactor KM2 is energized, and the fan operation contactor self-locking engagement switch KM2-1 is engaged to keep the fan operation control circuit and the fan operation circuit connected. The fan start and stop relay operation normally open switch KA1-2 is disconnected, the fan operation contactor KM2 is continuously energized, and the fan operation contactor contact switch KM2-2 is connected to the fan power supply AC3, and the fan F starts; at the same time, when the manual inching normally open start button is pressed, the air conditioning controller controls the heating signal. When the switch XH is closed, the main control preheating circuit is connected, the main control contactor KM1 is energized, and the main control contactor contactor KM1-3 connects the main control electric heater EH1 and the heating power supply AC2. The main control electric heater EH1 starts heating. At this time, the main control electric heater thyristor has no main thermostat signal, and the main control electric heater works at full power. When the cabin personnel do not need heating, they manually press the manual electric normally closed closing button SB2 to disconnect the fan start and stop circuit. The manual electric normally closed closing button SB2 receives a signal from the heating signal switch controlled by the air conditioning controller to open and disconnect the main control preheating circuit, completing the heating stop. The fan operation energization delay relay KT2 loses power. The fan operation energization delay relay normally open switch KT2-1 delays opening to disconnect the fan operation control circuit. The fan operation circuit is disconnected, the fan operation contactor KM2 loses power, and the fan is powered off.

[0049] (2) Automatic heating fresh air mode: in the air conditioner controller set automatic mode main temperature controller work, when the main temperature controller detects the outside fresh air temperature reaches 5 ℃, the main temperature controller switch WK1 joint switch on anti freeze main control circuit, the main temperature control power delay relay KT1 power on, within 30 s delay, if the main temperature controller detects the outside fresh air temperature is not lower than 5 ℃, the main temperature control power delay relay normally open switch KT1-1 is not closed, if the main temperature controller detects the outside fresh air temperature is lower than 5 ℃, the main temperature control power delay relay normally open switch KT1-1 is closed, switch on the main control preheating circuit, main control contactor power on, main control contactor switch on main control electric heater power supply, main control electric heater heating work, at this time, the main control electric heater thyristor KKG is controlled by the main temperature controller, and the main control electric heater EH1 is controlled by the main temperature controller according to the temperature signal, the temperature maintaining, the temperature drop amplitude and the rate; At the same time, the fan running power delay relay KT2 is powered on in the main control preheating circuit, the fan running power delay relay normally open switch KT2-1 is closed to switch on the fan running control circuit and the fan running circuit, the fan running contactor KM2 is powered on, the fan running contactor contact switch KM2-2 is connected to the fan power supply AC2, and the fan F runs;

[0050] (3) Auxiliary control heating fresh air: when the main temperature controller controls heating, the main control contactor auxiliary control switch KM1-2 is closed, and when the auxiliary temperature controller detects that the outside temperature is reduced to the lowest anti freezing temperature 0 ℃ below the anti freezing temperature 2 ℃, the auxiliary temperature controller switch WK2 is engaged with the auxiliary control preheating circuit, the auxiliary control contactor KM3 is powered on, the auxiliary control contactor contact switch KM3-2 is connected to the heating power supply AC2 and the auxiliary control electric heater EH2, and the auxiliary control electric heater is heated.

[0051] (4) Emergency heating fresh air: when the main temperature controller controls heating, the emergency temperature controller detects that the outside fresh air temperature is reduced to the dangerous minimum value -2 ℃, the emergency temperature controller switch WK3 is closed, the emergency anti freezing heating circuit is connected, the emergency contactor KM4 is powered on, the emergency contactor contact switch KM4-1 is connected to the heating power supply AC2 and the emergency electric heater EH3, and the emergency electric heater is heated.

[0052] (5) Fresh air heating stops: when the main temperature controller detects that the temperature reaches the engagement point temperature 5 ℃ or above, the main temperature controller switch WK1 is disconnected, the main temperature control power delay relay KT1 loses power at this time, the main control contactor delay normally closed contact KM1-1 delays the disconnection of the fan running control circuit and the fan running circuit, the fan running contactor KM2 controls the fan delay power off, and the main control electric heater residual heat is sent into the cabin.

[0053] (6) Heating over temperature protection: under the condition of frequent heating of the main control electric heater, the main control electric heater over temperature protection switch is disconnected to protect the main control electric heater.

[0054] (7) Fan protection: fan thermal relay switch is controlled by fan or fan shaft thermal relay in real time. In case of over temperature, the fan is automatically disconnected to realize the safety protection of the fan;

[0055] (8) Remote control: remote normally open start signal switch is closed under remote start signal, sequentially connecting fan start-stop circuit and fan operation circuit, and heating signal switch connects main control preheating circuit to realize heating and air supply. Remote normally closed closing signal switch is opened under remote closing signal, sequentially disconnecting fan start-stop circuit and fan operation circuit, and heating signal switch is opened to disconnect main control preheating circuit to complete heating stop.

[0056] The above control method is a new air control of fresh air conditioner. In actual application, the main temperature controller, auxiliary temperature controller and emergency temperature controller can be arranged in the new return air mixing box, and is suitable for new return air mixing air conditioner.

[0057] In the above control method, the auxiliary control heating fresh air can be configured in parallel with the auxiliary control electric heater controllable silicon circuit of the power supply. The auxiliary control electric heating controllable silicon receives the auxiliary control temperature controller signal to control the connection of the auxiliary control electric heater EH2. For example, the heating power is controlled in steps between the combination point temperature 5℃ and the anti-freezing temperature 2℃, and the full power heating is performed when the anti-freezing temperature is 2℃ to the lowest anti-freezing temperature 0℃.

Claims

1. A method for preheating control of marine air conditioner fresh air, comprising a power supply and a main anti-freezing control circuit, a main preheating control circuit, an auxiliary preheating control circuit, a fan start-stop circuit and a fan running circuit which are connected in parallel with the power supply; the main anti-freezing control circuit comprises a main temperature controller switch and a main temperature control power-on delay relay connected in series; the main preheating control circuit comprises a main temperature control power-on delay relay normally open switch, a main control electric heater over-temperature protection switch, a main contactor, a heating signal switch connected in parallel with the main temperature control power-on delay relay normally open switch, a fan running power-on delay relay connected in parallel with the main contactor, and a contact switch of the main contactor arranged between a heating power supply and a main control electric heater; the fan start-stop circuit comprises a manual point-on normally open start button, a manual point-off normally closed stop button, a remote normally closed stop signal switch and a fan start-stop relay connected in series, a remote normally open start signal switch and a fan start-stop relay self-locking switch connected in parallel with the manual point-on normally open start button, and a heating signal switch connected with the manual point-on normally open start button, the remote normally closed stop signal switch, the remote normally open start signal switch and the manual point-off normally closed stop button; the fan running circuit comprises a fan start-stop relay running normally open switch, an emergency stop signal switch, a fan thermal relay switch and a fan running contactor connected in series, a contact switch of the fan running contactor arranged between a fan power supply and a fan, a fan running control circuit connected in parallel with the fan start-stop relay running normally open switch, a main contactor delay normally closed contact and a fan running power-on delay relay normally open switch connected in series in the fan running control circuit, a main contactor delay normally closed contact arranged between the heating power supply and the main control electric heater, and a fan running contactor self-locking switch connected in parallel with the fan running power-on delay relay normally open switch; the auxiliary preheating control circuit comprises a main contactor auxiliary control switch, an auxiliary temperature controller switch and an auxiliary contactor connected in series, and a contact switch of the auxiliary contactor arranged between the heating power supply and an auxiliary control electric heater; the main temperature controller switch and the auxiliary temperature controller switch are respectively connected with a main temperature controller and an auxiliary temperature controller arranged in an air conditioner fresh air outlet or a return air mixing box; a main control electric heater thyristor circuit connected in parallel with the power supply is further included, a main control electric heating thyristor is arranged on the main control electric heater thyristor circuit, and the main control electric heating thyristor receives a main temperature controller signal to control connection with the main control electric heater; an auxiliary control electric heater thyristor circuit connected in parallel with the power supply is further included, an auxiliary control electric heating thyristor is arranged on the auxiliary control electric heater thyristor circuit, and the auxiliary control electric heating thyristor receives an auxiliary temperature controller signal to control connection with the auxiliary control electric heater; an emergency anti-freezing heating circuit is further included, and the emergency anti-freezing heating circuit comprises an auxiliary contactor delay normally open contact, an emergency temperature controller switch and an emergency electric contactor connected in series, and a contact switch of the emergency contactor arranged between the heating power supply and an emergency electric heater, and the emergency temperature controller switch connected with an air conditioner fresh air outlet or a return air mixing box. Also include the emergency electric heater SCR circuit in parallel on the power supply, the emergency electric heater SCR circuit is provided with emergency electric heating SCR, the emergency electric heating SCR receives the emergency temperature controller signal control connects the emergency electric heater; The control method comprises the following steps: (1) The active heating of fresh air mode: press the manual point dynamic normally open start button, the fan start-stop circuit is turned on, the fan start-stop relay is powered on, the fan start-stop relay self-locking switch is closed, the fan start-stop circuit remains on after the manual point dynamic normally open start button is popped up, the fan start-stop relay runs normally open switch closed, the fan running contactor is powered on, the fan running contactor self-locking switch is closed to keep the fan running control circuit and the fan running circuit on, the fan start-stop relay runs normally open switch is opened, the fan running contactor is powered on, the fan running contactor contact switch is connected to the fan power supply, and the fan runs; at the same time, when the manual point dynamic normally open start button is pressed, the heating signal switch is closed, the main control preheating circuit is turned on, the main control contactor is powered on, the main control contactor contact switch is connected to the main control electric heater power supply, the main control electric heater is heated, and the main control electric heater SCR has no main temperature controller signal at this time, and the main control electric heater works at full power; The manual press the manual electric dynamic normally closed closing button to disconnect the fan start-stop circuit, the fan start-stop relay heating signal switch gets the signal to open and disconnect the main control preheating circuit, the heating stops, the fan running power-on delay relay loses power, the fan running normally open switch of the fan running power-on delay relay is opened to disconnect the fan running control circuit, the fan running circuit is disconnected, the fan running contactor loses power, and the fan is powered off; (2) The automatic heating of fresh air mode: set the main temperature controller monitoring temperature range above the minimum frostproof temperature, set the main temperature controller switch joint temperature of the main temperature controller with the high value of the monitoring temperature range, and the main temperature controller works in the automatic mode of the air conditioner. When the main temperature controller detects that the temperature of the outside fresh air reaches the joint temperature, the main temperature controller switch joint connects the frostproof main control power-on circuit, the main temperature control power-on delay relay is powered on, and the delay time is connected. If the main temperature controller detects that the temperature of the outside fresh air exceeds the joint temperature, the main temperature control power-on delay relay normally open switch is not closed. If the main temperature controller detects that the temperature of the outside fresh air is at or below the joint temperature, the main temperature control power-on delay relay normally open switch is closed, the main control preheating circuit is connected, the main control contactor is powered on, the main control contactor contact switch is connected to the main control electric heater power supply, the main control electric heater is heated, the main control electric heater SCR receives the temperature signal detected by the main temperature controller, and the main control electric heater full power or step power is controlled according to the temperature maintenance, the temperature drop amplitude and the rate. At the same time, the fan running power-on delay relay of the main control preheating circuit is powered on, the fan running power-on delay relay normally open switch is closed to connect the fan running control circuit and the fan running circuit, the fan running contactor is powered on, the fan running contactor contact switch is connected to the fan power supply, and the fan runs. (3) Auxiliary control heating fresh air: when the main temperature controller controls heating, the main control contactor auxiliary control switch is closed, when the auxiliary temperature controller detects that the outside temperature decreases to the minimum anti-freezing temperature or the dangerous minimum value of the certain temperature range below the minimum anti-freezing temperature, the auxiliary temperature controller switch engages the auxiliary control preheating circuit, the auxiliary control contactor is powered, the auxiliary control contactor contact switch connects the auxiliary electric heater power supply, the auxiliary electric heater is heated, at this time, the auxiliary electric heater thyristor receives the temperature signal detected by the auxiliary temperature controller, and the auxiliary electric heater full power or step power is controlled by the auxiliary electric heater thyristor according to the temperature maintenance, the decrease amplitude and the rate; (4) Emergency heating fresh air: when the outside fresh air temperature is detected below the dangerous minimum value, the auxiliary control contactor is powered, the auxiliary control contactor delay normally open contact is closed, the emergency temperature controller switch is closed, the emergency anti-freezing heating circuit is connected, the emergency contactor is powered, the emergency contactor contact switch connects the emergency electric heater power supply, the emergency electric heater is heated, at this time, the emergency electric heater thyristor receives the temperature signal detected by the emergency temperature controller, and the emergency electric heater full power or step power is controlled by the emergency electric heater thyristor according to the temperature maintenance, the decrease amplitude and the rate; (5) Fresh air heating stop: when the main temperature controller detects that the temperature reaches the engagement point temperature above, the main temperature controller switch is opened, at this time, the main control power supply is powered, the main control contactor delay normally closed contact is delayed to open the fan running control circuit and the fan running circuit, the fan running contactor controls the fan delay power-off, and the main control electric heater waste heat is sent into the cabin; (6) Heating over-temperature protection: under the condition of frequent heating of the main control electric heater, the main control electric heater over-temperature protection switch is opened to protect the main control electric heater; (7) Fan protection: the fan thermal relay switch is controlled by the fan or the fan shaft thermal relay in real time, and in the case of over-temperature, the fan is automatically disconnected to realize the safety protection of the fan; (8) Remote control: the remote normally open starting signal switch is closed under the remote starting signal, and the fan start-stop circuit and the fan running circuit are sequentially connected, and the heating signal switch connects the main control preheating circuit to realize heating and air supply; the remote normally closed closing signal switch is opened under the remote closing signal, and the fan start-stop circuit and the fan running circuit are sequentially disconnected, the heating signal switch is opened to disconnect the main control preheating circuit, and the heating is stopped.

2. The method for controlling the pre-heating of fresh air of a marine air conditioner according to claim 1, characterized in that: The contactors are all connected with indicator lights in parallel.

3. A method for controlling preheating of fresh air in a marine air conditioner, characterized by: The application relates to an air conditioner anti-freezing control circuit, which comprises a power supply and anti-freezing main control power-on circuits, main control preheating circuits, auxiliary control preheating circuits, fan start-stop circuits and fan operation circuits which are all connected in parallel with the power supply; the anti-freezing main control power-on circuits comprise main temperature controllers and main temperature control power-on delay relays which are connected in series; the main control preheating circuits comprise main temperature control power-on delay relays, main control electric heater over-temperature protection switches, main control contactors, main temperature control power-on delay relay always-open switches and heating signal switches which are connected in series; the fan start-stop circuits comprise manual point-driving always-open start buttons, manual point-driving always-closed stop buttons, remote always-closed stop signal switches and fan start-stop relays which are connected in series; the fan operation circuits comprise fan start-stop relay operation always-open switches, emergency stop signal switches, fan thermal relay switches, fan operation contactors, fan operation control circuits, main control contactor delay always-closed contacts and fan operation power-on delay relay always-open switches which are connected in series; the auxiliary control preheating circuits comprise main control contactor auxiliary control switches, auxiliary temperature controllers and auxiliary control contactors which are connected in series; the main temperature controller switches and the auxiliary temperature controller switches are connected with main temperature controllers and auxiliary temperature controllers arranged in air conditioner fresh air inlets or return air mixing boxes respectively; the main control electric heater thyristor circuits, the auxiliary control electric heater thyristor circuits, the emergency anti-freezing heating circuits and the emergency electric heater thyristor circuits are connected in parallel with the power supply; the main control electric heater thyristors, the auxiliary control electric heater thyristors, the emergency electric heater thyristors and the emergency anti-freezing heating circuits are connected with the main control electric heaters, the auxiliary control electric heaters, the emergency electric heaters and the emergency anti-freezing heaters respectively. ​ ​ ​ ​ The control method comprises the following steps: (1) The active heating fresh air mode: press the manual point-dynamic normally open start button, connect the fan start-stop circuit, the fan start-stop relay is powered on, the fan start-stop relay self-locking switch is closed, the fan start-stop circuit is kept on after the manual point-dynamic normally open start button is popped up, the fan start-stop relay running normally open switch is closed, the fan running contactor is powered on, the fan running contactor self-locking switch is closed to keep the fan running control circuit and the fan running circuit on, the fan start-stop relay running normally open switch is opened, the fan running contactor is continuously powered on, the fan running contactor contact switch connects the fan power supply, and the fan runs; at the same time, when the manual point-dynamic normally open start button is pressed, the heating signal switch is closed, the main control preheating circuit is connected, the main control contactor is powered on, the main control contactor contact switch connects the main control electric heater power supply, the main control electric heater is heated, at this time, the main control electric heater thyristor has no main temperature controller signal, and the main control electric heater works at full power; press the manual electrically-controlled normally closed close button to disconnect the fan start-stop circuit, the fan start-stop relay heating signal switch is powered on to disconnect the main control preheating circuit, heating is stopped, the fan running power-on delay relay is powered off, the fan running normally open switch is opened to disconnect the fan running control circuit, the fan running circuit is disconnected, the fan running contactor is powered off, and the fan is powered off; (2) The automatic heating mixed air mode: set the main temperature controller monitoring temperature range above the lowest anti-freezing temperature, set the main temperature controller switch joint temperature of the main temperature controller at the high value of the monitoring temperature range, and work in the automatic mode of the air conditioner; when the main temperature controller detects that the mixed air temperature in the fresh air and return air mixing box reaches the joint temperature, the main temperature controller switch joint connects the anti-freezing main control power-on circuit, the main temperature controller power-on delay relay is powered on, and in the delay time, if the main temperature controller detects that the mixed air temperature exceeds the joint temperature, the main temperature controller power-on delay relay normally open switch is not closed, if the main temperature controller detects that the mixed air temperature is at or below the joint temperature, the main temperature controller power-on delay relay normally open switch is closed, the main control preheating circuit is connected, the main control contactor is powered on, the main control contactor contact switch connects the main control electric heater power supply, the main control electric heater is heated, at this time, the main control electric heater thyristor receives the temperature signal detected by the main temperature controller, and the main control electric heater full power or step power is controlled according to the temperature maintenance, the temperature drop amplitude, and the rate; at the same time, the fan running power-on delay relay of the main control preheating circuit is powered on, the fan running power-on delay relay normally open switch is closed to connect the fan running control circuit and the fan running circuit, the fan running contactor is powered on, the fan running contactor contact switch connects the fan power supply, and the fan runs. (3) Auxiliary control heating fresh air: When the main temperature controller controls heating, the main control contactor auxiliary control switch is closed, when the auxiliary temperature controller detects that the mixed air temperature decreases to the minimum anti-freezing temperature or a certain temperature range below the minimum anti-freezing temperature, the auxiliary temperature controller switches on the auxiliary preheating circuit, the auxiliary control contactor is powered, the auxiliary control contactor contact switch connects the auxiliary electric heater power supply, and the auxiliary electric heater is heated. At this time, the auxiliary electric heater thyristor is controlled by the auxiliary temperature controller to detect the temperature signal, and the auxiliary electric heater full power or step power is controlled according to the temperature maintenance, drop amplitude and rate. (4) Emergency heating fresh air: When the mixed air temperature is detected below the dangerous minimum value, the auxiliary control contactor is powered, the auxiliary control contactor delay normally open contact is closed, the emergency temperature controller switch is closed, the emergency anti-freezing heating circuit is connected, the emergency contactor is powered, the emergency control contactor contact switch connects the emergency electric heater power supply, and the emergency electric heater is heated. At this time, the emergency electric heater thyristor is controlled by the emergency temperature controller to detect the temperature signal, and the emergency electric heater full power or step power is controlled according to the temperature maintenance, drop amplitude and rate. (5) Fresh air heating stop: When the main temperature controller detects that the temperature reaches the engagement point temperature, the main temperature controller switch is opened, and the main control power supply is powered. The main control contactor delay normally closed contact delays the opening of the fan running control circuit and the fan running circuit, and the fan running contactor controls the fan delay power-off, and the main control electric heater waste heat is sent into the cabin. (6) Heating over-temperature protection: Under the condition of frequent heating of the main control electric heater, the main control electric heater over-temperature protection switch is opened to protect the main control electric heater. (7) Fan protection: The fan thermal relay switch is controlled by the fan or fan shaft thermal relay in real time. In the case of over-temperature, the fan is automatically disconnected to realize the safety protection of the fan. (8) Remote control: The remote normally open start signal switch is closed under the remote start signal, and the fan start-stop circuit and the fan running circuit are connected in turn. At the same time, the heating signal switch connects the main control preheating circuit to realize heating and air supply. The remote normally closed closing signal switch is opened under the remote closing signal, and the fan start-stop circuit and the fan running circuit are disconnected in turn. The heating signal switch is opened to disconnect the main control preheating circuit, and the heating is stopped.

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