CN-121983913-A - Marine air conditioner low-voltage protection control circuit and control method thereof

CN121983913ACN 121983913 ACN121983913 ACN 121983913ACN-121983913-A

Abstract

The invention discloses a low-voltage protection control circuit and a control method thereof for a marine air conditioner, and relates to the field of marine air conditioners. The control power supply is connected with a plurality of groups of functional circuits in parallel, and comprises a first power-on delay circuit connected with a first power-on delay relay in series, a second power-on delay circuit connected with a low-voltage controller protection switch and a second power-on delay relay in series, a power-off delay circuit, a counter circuit, a starting circuit, an operating circuit and an alarm circuit, wherein the circuits are linked through elements such as a relay contact and a switch. The control method realizes low-voltage protection through delay screening, fault counting and multiple interlocking. The invention can accurately discriminate low-voltage instantaneous fluctuation and continuous faults, avoid error stop, ensure continuous and stable operation of the air conditioner, assist the fault counting function to quickly position the problem root, improve maintenance efficiency, ensure equipment safety and fault response speed by a multiple protection mechanism, adapt to special sailing working conditions of ships, effectively prolong the service life of the compressor and ensure sailing safety and operation efficiency of the ships.

Inventors

QIN BOJIN
CHEN XINHUA
CHEN QIAOHUA

Assignees

江苏兆胜空调有限公司

Dates

Publication Date: 20260505
Application Date: 20260129

Claims (6)

1. The utility model provides a marine air conditioner low pressure protection control circuit, includes the control power supply, connects in parallel on the control power supply has first electricity delay circuit, second electricity delay circuit, loses electric delay circuit, counter circuit, starting circuit, operation circuit and alarm circuit, connect in series first electricity delay circuit on the first electricity delay circuit, connect in series low pressure controller protection switch and second electricity delay relay on the second electricity delay circuit in proper order, connect in series second electricity delay relay normally open contact and the electricity delay relay on the electricity delay circuit in proper order, connect in series first electricity delay relay normally open contact, electricity delay relay normally open contact and counter on the counter circuit in proper order, connect in series start button, stop button, counter normally open switch and compressor start relay on the start button in proper order, connect in series compressor start relay first normally open switch on the operation circuit in series, electric delay starter contact normally open and compressor operation contactor on the counter normally open switch in proper order.
2. The low-voltage protection control circuit of the marine air conditioner according to claim 1, wherein the counter is provided with a reset switch.
3. The low-voltage protection control circuit of the marine air conditioner according to claim 1, wherein the starting circuit is further provided with a normally open switch of a compressor protection relay, and the compressor protection relay is connected to the air conditioner main circuit.
4. The low-voltage protection control circuit of the marine air conditioner according to claim 1, wherein the alarm is an acoustic and/or optical alarm device.
5. A control method for a marine air conditioner low-voltage protection control circuit according to claim 1 is characterized in that before an air conditioner is started, after an air conditioner main circuit and a control power supply are electrified, a compressor protection relay is electrified, a compressor protection relay normally open switch is closed, a first electric delay relay of a first electric delay circuit is electrified, a low-voltage controller protection switch of a second electric delay circuit is in a closed state by default when a compressor is not in operation, the second electric delay circuit is electrified, the second electric delay relay is electrified, an operation circuit is electrified, a running circuit is electrified, the normally open switch is electrified, a counter circuit is electrified, a starting button of the air conditioner is required to be pressed down, the counter normally open switch is closed, the compressor is opened, the compressor is in a state by default, the second electric delay circuit is electrified, the second electric delay relay normally open contact is electrified, the running circuit is electrified, the counter circuit normally closed contact is kept closed, the counter circuit normally open contact is electrified when the compressor is normally closed, the second electric delay circuit is in an abnormal state, the low-voltage relay is normally open, the counter circuit is normally closed, the compressor is normally closed, the abnormal, the compressor is normally open, and the low-voltage relay is normally closed, and the voltage is normally closed, the normally open contact of the power-off delay relay of the running circuit is kept to be opened, the running contactor of the compressor is powered off, the compressor is stopped, and the normally closed switch of the counter is connected with the alarm circuit to be powered on, so that the alarm gives an alarm.
6. The control method of the marine air conditioner low-voltage protection control circuit is characterized in that when a compressor protection relay is disconnected by fault signals such as current and voltage, a normally open switch of the compressor protection relay is disconnected, a compressor starting relay of a starting circuit is powered off, a second normally open switch of a compressor starting relay of an operating circuit is disconnected, the operating circuit is powered off, a compressor running contactor is powered off, the compressor is stopped, a low-voltage controller protection switch is disconnected after the low-voltage controller monitors a low-voltage state after the compressor is stopped, a second power-obtaining delay relay is powered off, a normally open contact of the second power-obtaining delay relay is disconnected, a power-losing delay relay is powered off, a normally closed contact of the power-losing delay relay of a counter circuit is powered off after the power-losing relay is powered off, a normally closed switch of the counter is closed, an alarm circuit is powered on, and the alarm is alarmed.

Description

Marine air conditioner low-voltage protection control circuit and control method thereof Technical Field The invention relates to the field of marine air conditioners, in particular to a control method of a low-voltage protection control circuit of a marine air conditioner. Background The marine air conditioner is used as key equipment for guaranteeing the living comfort of crews and the stability of the equipment operation environment in the ship navigation process, and the operation reliability of the marine air conditioner directly influences the navigation safety and the operation efficiency of the ship. The compressor is used as a core component of the marine air conditioner, the working state of the compressor is critical to the overall performance of an air conditioning system, and the low-pressure abnormality is a common fault type in the operation process of the compressor, and if the compressor is improperly processed, the compressor is easily insufficiently lubricated and overheated to burn out, and even the paralysis of the air conditioning system is caused, so that the stable operation of a marine electric power system is influenced. At present, a single threshold trigger mechanism is mostly adopted in the low-voltage protection control circuit of the existing marine air conditioner, namely, the low-voltage controller triggers shutdown protection immediately after monitoring a low-voltage signal. On the one hand, the voltage and the pipeline pressure of an air conditioning system are easy to generate instantaneous fluctuation and a single threshold protection mechanism cannot distinguish instantaneous fluctuation and continuous faults, error shutdown is easy to be caused, continuity of operation of an air conditioner is damaged, especially in scenes with high air dependence such as ocean voyage, frequent error shutdown seriously affects working life and equipment stability of crews, on the other hand, the existing protection circuit lacks fault counting and grading response functions, when low-voltage abnormality occurs for many times, the problem root cannot be assisted by accumulated fault information, so that blindness in the maintenance process is strong, the troubleshooting efficiency is low, maintenance resources are limited when the ship is far away from a port, and operation loss is further enlarged due to overlong time for troubleshooting. Disclosure of Invention The invention provides the marine air conditioner low-voltage protection control circuit and the control method thereof, which can accurately count, are favorable for screening low-voltage abnormality problems, ensure continuous and stable operation and simultaneously consider safety protection and fault response efficiency. The technical scheme includes that the marine air conditioner low-voltage protection control circuit comprises a control power supply, a first power-on delay circuit, a second power-on delay circuit, a power-off delay circuit, a counter circuit, a starting circuit, an operating circuit and an alarm circuit are connected in parallel on the control power supply, the first power-on delay circuit is connected with a first power-on delay relay in series, the second power-on delay circuit is connected with a low-voltage controller protection switch and a second power-on delay relay in series in sequence, the power-off delay circuit is connected with a second power-on delay relay normally-open contact and a power-off delay relay in series in sequence, the counter circuit is connected with a first power-on delay relay normally-open contact, a power-off delay relay normally-closed contact and a counter in series in sequence, the starting circuit is connected with a starting button, a stop button, a counter normally-open switch and a compressor starting relay in series, the operating circuit is connected with a compressor starting second normally-open switch, the power-off delay relay normally-open contact and a compressor running contact normally-open switch and an alarm circuit in series in sequence. The counter is provided with a reset switch. And the starting circuit is also provided with a normally open switch of a compressor protection relay, and the compressor protection relay is connected to the air conditioner main circuit. The alarm is an acoustic and/or optical alarm device. A control method of a low-voltage protection control circuit of a root ship air conditioner is characterized in that before the air conditioner is started, after a main circuit of the air conditioner and a control power supply are electrified, a compressor protection relay is electrified, and a normally open switch of the compressor protection relay is closed; the low-voltage controller protection switch of the second power-on delay circuit is in a closed state by default when the compressor is not in operation, the second power-on delay circuit is powered on, the second power-on delay relay is powered on, a normally open contact of t