Novel anti-freezing automatic drainage device for marine air conditioner heat exchanger

Abstract

The utility model relates to a novel anti-freezing automatic drainage device for a marine air conditioner heat exchanger, which comprises a hot water heat exchanger arranged between an evaporator and a fan, the lower part of the hot water heat exchanger is connected with a ship hot water supply pipe for feeding hot water, and the upper part of the hot water heat exchanger is connected with a water outlet pipe; a water inlet pipe or a water outlet pipe of the hot water heat exchanger is provided with a waterway electromagnetic valve, the bottom of the hot water heat exchanger is connected with a heat exchanger emptying pipe, the heat exchanger emptying pipe is provided with an emptying electromagnetic valve, and the waterway electromagnetic valve controls the emptying electromagnetic valve in a reverse delay linkage mode through a PLC. The PLC is further connected with a fresh air temperature sensor on a fresh air opening in front of the evaporator and / or a mixing cavity temperature sensor in the fresh air and return air mixing cavity. The device can timely control water storage in the heat exchanger to be emptied according to the air supply temperature, the hot water temperature and hot water supply on-off, prevent the heat exchanger from being frostbitten and damaged, and improve the use safety performance of the heat exchanger.

Description

Technical Field

[0001] This utility model relates to marine air conditioning technology, specifically a novel automatic antifreeze drainage device for marine air conditioning heat exchangers. Background Technology

[0002] In order to improve air quality, most existing ship air conditioning systems are equipped with fresh air systems, which introduce fresh air through fresh air inlets and adopt a fresh air or fresh air return mixed structure. The heating of the air conditioning uses the ship's hot water to heat the water through heat exchange coils set behind the evaporator. However, when the ship is sailing in a low-temperature environment, and the temperature is still low after the fresh air is directly introduced or the fresh air return is mixed, water will be stored in the heat exchange coils after heating stops or the air conditioning is shut down. The stored water is prone to freezing when the air is supplied at low temperatures, which can cause the heater coils to crack and affect the safety of the air conditioning. Summary of the Invention

[0003] This invention provides a novel automatic antifreeze drainage device for marine air conditioning heat exchangers. It has a simple structure and can promptly control the drainage of water stored in the heat exchanger based on the air supply temperature, hot water temperature, and hot water supply status, thus preventing freezing damage to the heat exchanger and ensuring safe use of the heat exchanger.

[0004] The technical solution adopted by this utility model is: a novel automatic antifreeze drainage device for marine air conditioning heat exchangers, including a hot water heat exchanger installed between the evaporator and the fan. The lower part of the hot water heat exchanger is connected to the ship's hot water supply pipe for hot water inlet, and the upper part of the hot water heat exchanger is connected to the outlet pipe. The device is characterized in that: a hot water temperature sensor is installed on the inlet pipe of the hot water heat exchanger, a water circuit solenoid valve is installed on the inlet or outlet pipe of the hot water heat exchanger, a heat exchanger drain pipe is connected to the bottom of the hot water heat exchanger, and a drain solenoid valve is installed on the drain pipe. The water circuit solenoid valve is controlled by a PLC controller via a reverse delay linkage. The PLC controller is also connected to a fresh air temperature sensor on the fresh air inlet in front of the evaporator and / or a mixing chamber temperature sensor in the fresh air and return air mixing chamber.

[0005] A U-shaped downward bend is installed on the inlet pipe between the hot water heat exchanger and the inlet solenoid valve. The lowest point of the U-shaped downward bend connects to the inlet drain pipe. An inlet drain solenoid valve is installed on the inlet drain pipe. The inlet drain solenoid valve is synchronously linked with the drain solenoid valve via a PLC controller.

[0006] A U-shaped downward bend is installed on the outlet pipe between the hot water heat exchanger and the outlet solenoid valve. The lowest point of the U-shaped downward bend connects to the outlet drain pipe. An outlet drain solenoid valve is installed on the outlet drain pipe. The outlet drain solenoid valve is synchronously linked with the drain solenoid valve via a PLC controller.

[0007] The inlet pipe is equipped with a three-way regulating valve located before the water circuit solenoid valve. The third channel of the three-way regulating valve is connected to the outlet pipe between the water circuit solenoid valve and the hot water outlet pump.

[0008] The shutdown delay of the hot water pump is synchronized with the delay of the water circuit solenoid valve.

[0009] The beneficial effects of this utility model are:

[0010] 1. Under normal heating and air supply conditions, when the water solenoid valve receives a signal, the venting solenoid valve closes in reverse linkage. Hot water is sent to the hot water heat exchanger via the inlet pipe and water solenoid valve through the hot water outlet pump and is then sent out through the outlet pipe. At this time, the temperature monitoring by the fresh air temperature sensor and the mixing chamber temperature sensor is only used to control the heating power, and the hot water supply temperature is increased or the power of the hot water outlet pump is increased.

[0011] 2. When heating is not required or the system is shut down, the temperature of the air supplied to the fan is monitored by the fresh air temperature sensor and the mixing chamber temperature sensor. When the temperature is below the set freezing critical safety temperature, the water solenoid valve loses its signal, the drain solenoid valve opens after a delay due to temperature monitoring, the three-way regulating valve switches to the outlet pipe, and the hot water pump delays, returning the continuously supplied hot water to the water tank to avoid wasting fresh water resources. The hot water accumulated in the heat exchanger coil is directly discharged by the drain solenoid valve on the drain pipe. Combined with the opening of the drain solenoid valves of the U-shaped downward bend between the water storage solenoid valve and the hot water heat exchanger, the water accumulated in the inlet and outlet pipes that may be due to the installation angle of their respective piping systems can be discharged. This ensures that the accumulated water in the heat exchanger and the inlet and outlet pipes of the hot water supply and discharge is completely emptied while taking into account fresh water resources, avoiding freezing and cracking damage caused by low-temperature air supply, and improving the safety and stability of use. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] In the diagram: 1. Fresh air mixing chamber; 2. Mixing chamber temperature sensor; 3. Fresh air inlet; 4. Fresh air temperature sensor; 5. Evaporator; 6. Heat exchanger; 7. Fan; 8. Inlet pipe; 9. Outlet pipe; 10. Three-way regulating valve; 11. Water circuit solenoid valve; 12. Inlet U-shaped downward bend pipe; 13. Inlet drain pipe; 14. Inlet drain solenoid valve; 15. Outlet U-shaped downward bend pipe; 16. Outlet drain pipe; 17. Heat exchanger drain pipe; 18. Drain solenoid valve; 19. Hot water pump; 20. Detailed Implementation

[0014] The following explanation, in conjunction with the accompanying drawings, will provide further details.

[0015] Figure 1As shown, a novel automatic antifreeze drainage device for marine air conditioning heat exchangers includes a mixing chamber temperature sensor 2, a fresh air temperature sensor 4, a heat exchanger 6, a three-way regulating valve 10, a water circuit solenoid valve 11, an inlet U-shaped downward bend pipe 12, an inlet drain pipe 13, an inlet drain solenoid valve 14, an outlet U-shaped downward bend pipe 15, an outlet drain pipe 16, an outlet drain solenoid valve 17, a heat exchanger drain pipe 18, a drain solenoid valve 19, and a hot water pump 20.

[0016] A mixing chamber temperature sensor 2 is installed in the fresh air mixing chamber 1 of the marine air conditioner, and a fresh air temperature sensor 4 is installed in the fresh air inlet 3; a heat exchanger 6 is installed between the evaporator 5 and the fan 7, and a heat exchanger vent pipe 18 is connected to the lowest point of the piping system inside the heat exchanger 6, and a vent solenoid valve 19 is installed on the heat exchanger vent pipe 18. The heat exchanger 6 supplies hot water via an inlet pipe 8 and an outlet pipe 9, respectively. A three-way regulating valve 10, a water circuit solenoid valve 11, and an inlet U-shaped downward bend pipe 12 are sequentially installed on the inlet pipe 8. The lowest point of the inlet U-shaped downward bend pipe 12 is lower than the lowest point of the inlet pipe between the three-way regulating valve 10 and the heat exchanger 6. An inlet drain pipe 13 is connected to the lowest point of the inlet U-shaped downward bend pipe 12. An inlet drain solenoid valve 14 is installed on the inlet drain pipe 13. An outlet U-shaped downward bend pipe 15 and a hot water pump 20 are sequentially installed on the outlet pipe. The third path of the three-way regulating valve 10 is connected between the outlet U-shaped downward bend pipe 15 and the hot water pump 20. The lowest point of the outlet U-shaped downward bend pipe 15 is lower than the lowest point of the outlet pipe between the hot water pump 20 and the heat exchanger 6. An outlet drain pipe 14 is connected to the lowest point of the outlet U-shaped downward bend pipe 15. 6. A drain solenoid valve 17 is installed on the drain pipe 16. The drain solenoid valve 19 is linked by the water circuit solenoid valve 11 in reverse delay. After the water circuit solenoid valve 11 no longer receives the signal for hot water to be supplied, and after the mixing chamber temperature sensor and the fresh air temperature sensor detect that the temperature is lower than the set antifreeze stability, the water circuit solenoid valve 11 controls the drain solenoid valve 19 to open and drain the accumulated water. The inlet drain solenoid valve 14 and the outlet drain solenoid valve 17 are opened and closed synchronously with the drain solenoid valve 19, which can realize the drainage of the water accumulated in the pipe after the three-way regulating valve in the inlet and outlet pipes. Combined with the delayed closing of the hot water pump 20, the water accumulated in the pipe before the three-way regulating valve in the inlet pipe and the pipe before the hot water pump in the outlet pipe is drained. The water accumulated in the pipe of the overall air conditioning heat exchanger is fully drained, the antifreeze performance is stable, and the service life is long.

Claims

1. A novel automatic antifreeze drainage device for marine air conditioning heat exchangers, comprising a hot water heat exchanger disposed between an evaporator and a fan, wherein the lower part of the hot water heat exchanger is connected to a ship's hot water supply pipe for hot water inlet, and the upper part of the hot water heat exchanger is connected to an outlet pipe, characterized in that: A hot water temperature sensor is installed on the inlet pipe of the hot water heat exchanger, and a water circuit solenoid valve is installed on the inlet or outlet pipe of the hot water heat exchanger. A heat exchanger vent pipe is connected to the bottom of the hot water heat exchanger, and a vent solenoid valve is installed on the vent pipe. The water circuit solenoid valve is controlled by the PLC controller via a reverse delay linkage. The PLC controller is also connected to a fresh air temperature sensor on the fresh air inlet in front of the evaporator and / or a mixing chamber temperature sensor in the fresh air and return air mixing chamber.

2. The novel marine air conditioning heat exchanger antifreeze automatic drainage device according to claim 1, characterized in that: A U-shaped downward bend is installed on the inlet pipe between the hot water heat exchanger and the inlet solenoid valve. The lowest point of the U-shaped downward bend connects to the inlet drain pipe. An inlet drain solenoid valve is installed on the inlet drain pipe. The inlet drain solenoid valve is synchronously linked with the drain solenoid valve via a PLC controller.

3. The novel marine air conditioning heat exchanger antifreeze automatic drainage device according to claim 1, characterized in that: A U-shaped downward bend is installed on the outlet pipe between the hot water heat exchanger and the outlet solenoid valve. The lowest point of the U-shaped downward bend connects to the outlet drain pipe. An outlet drain solenoid valve is installed on the outlet drain pipe. The outlet drain solenoid valve is synchronously linked with the drain solenoid valve via a PLC controller.

4. A novel automatic antifreeze drainage device for marine air conditioning heat exchangers according to claim 1, 2, or 3, characterized in that: The inlet pipe is equipped with a three-way regulating valve located before the water circuit solenoid valve. The third channel of the three-way regulating valve is connected to the outlet pipe between the water circuit solenoid valve and the hot water outlet pump.

5. A novel automatic antifreeze drainage device for marine air conditioning heat exchangers according to claim 4, characterized in that: The shutdown delay of the hot water pump is synchronized with the delay of the water circuit solenoid valve.

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