CN108528170A - A kind of air-conditioning battery heat pump system - Google Patents

Abstract

The invention discloses an air conditioner battery heat pump system, which comprises an air conditioner heat pump subsystem and a battery heat pump subsystem; the air conditioner heat pump subsystem comprises a compressor (1), a gas-liquid separator (14), a four-way valve (5), and a condenser (3) and evaporator (10); the compressor outlet is connected to the D port of the four-way valve through the first one-way valve (2); the S port of the four-way valve is connected to the gas-liquid separator through the second one-way valve (13) The inlet of the gas-liquid separator is connected with the inlet of the compressor; the battery heat pump subsystem includes the second solenoid valve (15), the battery heat pump subsystem heat exchanger (17), the second expansion valve (16) and the third Solenoid valve (18); the second end of the evaporator is connected to C of the four-way valve through the second solenoid valve, the second expansion valve, the first heat exchange channel of the battery heat pump subsystem heat exchanger, and the third solenoid valve in sequence. Port; the battery heat pump subsystem heat exchanger is connected to the battery cooling water circuit. The air-conditioning battery heat pump system has an ingenious structure, is easy to implement, and is flexible and convenient to control.

Description

An air conditioner battery heat pump system

technical field

The invention relates to an air conditioner battery heat pump system.

Background technique

With the country's promotion of energy saving and emission reduction, more and more cars are driven by power batteries. During the operation of the vehicle, it is necessary to turn on the air conditioner when the temperature inside the car is too high or too low. This is common for ordinary passenger buses or buses. have the function. However, due to the large functions of buses or buses, when the air conditioner is turned on, the battery will generate a lot of heat. In order to ensure the heat dissipation of the battery, an external heat dissipation device is generally equipped to cool the battery. In addition, when the vehicle is running in a cold environment, The performance of the battery will drop rapidly, and it is necessary to heat the battery to ensure its reliable and stable operation. In the prior art, a heating device is specially added to heat the battery. Unified control, complex equipment and difficult maintenance, therefore, it is necessary to design a new air-conditioning battery heat pump system.

Contents of the invention

The technical problem to be solved by the present invention is to provide an air-conditioning battery heat pump system, which has an ingenious structure, is easy to implement, and is easy to control.

The technical solution of the invention is as follows:

An air-conditioning battery heat pump system, including an air-conditioning heat pump subsystem and a battery heat pump subsystem;

The air-conditioning heat pump subsystem includes a compressor (1), a gas-liquid separator (14), a four-way valve (5), a condenser (3) and an evaporator (10);

The four-way valve has 4 ports: D, E, S and C, where the D port is on the first side, and the E, S, C ports are on the second side, and the S port is between the E port and the C port;

The outlet of the compressor is connected to the D port of the four-way valve through the first one-way valve (2); the S port of the four-way valve is connected to the inlet of the gas-liquid separator through the second one-way valve (13), and the outlet of the gas-liquid separator is connected to the The inlet of the compressor is connected;

The E port of the four-way valve is connected to the first end of the condenser, and the second end of the condenser is connected to the first end of the evaporator through the first electromagnetic valve (8) and the first expansion valve (9) sequentially, and the second end of the evaporator The end is connected to the C port of the four-way valve through the fourth solenoid valve (12);

The battery heat pump subsystem includes a second solenoid valve (15), a battery heat pump subsystem heat exchanger (17), a second expansion valve (16) and a third solenoid valve (18);

The heat exchanger of the battery heat pump subsystem can be a plate heat exchanger or a water-cooled heat exchanger.

The second end of the evaporator is connected to the C port of the four-way valve through the second solenoid valve, the second expansion valve, the first heat exchange channel of the battery heat pump subsystem heat exchanger, and the third solenoid valve; the battery heat pump subsystem The second heat exchange channel of the heat exchanger is connected in series in the battery cooling water circuit.

Both the first solenoid valve and the second solenoid valve are connected to the second end of the condenser through a dry filter.

A sight glass is arranged on the pipeline between the first solenoid valve or the second solenoid valve and the dry filter. Specifically, the first electromagnetic valve, the second electromagnetic valve and the dry filter are connected through a three-way pipe.

There are multiple heat exchangers in the battery heat pump subsystem, which are connected in parallel.

The evaporator is provided with an evaporating fan, and the condenser is provided with a condensing fan.

Both the first expansion valve and the second expansion valve are electronic expansion valves, and both the first expansion valve and the second expansion valve are connected with a driving circuit capable of voltage regulation. The heat demand of the two subsystems is distributed by adjusting the opening of the expansion valve through the driving circuit. Preferably, the two driving circuits are independent, that is, they can be controlled separately, and the expansion valve can also be a manual expansion valve.

The air-conditioning battery heat pump system further includes a controller, the controller is used to control the switching states of the solenoid valves and the four-way valve in the air-conditioning battery heat pump system, and is also used to control the opening and closing of the first expansion valve and the second expansion valve. Spend.

The controller is connected with a communication module. The communication module is used to transmit the on-site status to the upper computer or remote terminal, and the communication module is a wired or wireless communication module.

When the four-way valve is in the first state (power-off state or default state), the air-conditioning battery heat pump system works in the cooling state;

The first state refers to: the S and C ports of the four-way valve form a group of ports to communicate, and the D and E ports of the four-way valve form a second group of ports to communicate; the first group of ports and the second group of ports are connected to each other; Not connected between;

The air conditioner battery heat pump system works in the cooling state, including three working modes:

Working mode 1: individual air-conditioning refrigeration: require the first solenoid valve and the fourth solenoid valve to be connected, and require the evaporator to work;

Working mode 2: battery cooling alone; requires the second solenoid valve and the third solenoid valve to be connected.

Working mode 3: double cooling of the air conditioner battery; the first solenoid valve and the fourth solenoid valve are required to be connected, and the evaporator is required to work; and the second solenoid valve and the third solenoid valve are required to be connected. It can also be considered as a superposition of working mode 1 and working mode 2.

When the four-way valve is in the second state (energized state), the air-conditioning battery heat pump system works in the heating state; the second state refers to: the S and E ports of the four-way valve form a group of ports connected, and the four-way The D and C ports of the valve form the second group of ports and communicate with each other; the first group of ports and the second group of ports are not connected;

The air conditioner battery heat pump system works in the heating state, including three working modes:

Working mode I: independent air conditioning and heating: require the first solenoid valve and the fourth solenoid valve to be connected, and require the evaporator to work;

Working mode II: independent battery heating; requires the second solenoid valve and the third solenoid valve to be connected.

Working mode III: dual heating of the air conditioner battery; the first solenoid valve and the fourth solenoid valve are required to be turned on, and the evaporator is required to work; and the second solenoid valve and the third solenoid valve are required to be turned on. It can also be considered as a superposition of working mode I and working mode II.

The controller is single-chip microcomputer, DSP, PLCD and so on.

A method for controlling an air-conditioning battery heat pump, wherein the air-conditioning battery heat pump includes an air-conditioning heat pump subsystem and a battery heat pump subsystem;

The control method includes cooling control and heating control;

The refrigeration control refers to the realization of air-conditioning refrigeration or battery refrigeration;

The heating control refers to realizing air-conditioning heating or battery heating.

Beneficial effect:

The invention discloses an air conditioner battery heat pump system, which can realize the temperature adjustment of the air conditioner and the battery through the air conditioner heat pump subsystem and the battery heat pump subsystem, has good flexibility, realizes integrated unified control, and is easy to implement.

In addition, according to the control of the expansion valve, the cold or heat can be distributed flexibly, which can not only achieve the effect of temperature regulation, but also help to achieve the maximum energy saving.

All in all, the system can meet the needs of air conditioners and batteries for heat under various working conditions, and has significant advantages such as reasonable distribution, quick response, and efficient utilization.

Description of drawings

Figure 1 is a schematic diagram of the air conditioner battery heat pump system during cooling;

Fig. 2 is a schematic diagram of the air conditioner battery heat pump system during heating.

Explanation of symbols: 1-compressor, 2-first one-way valve, 3-condenser, 4-condensing fan, 5-four-way valve, 6-drying filter, 7-sight glass, 8-first solenoid valve , 9-first expansion valve, 10 evaporator, 11-evaporator fan, 12-fourth solenoid valve, 13-second one-way valve, 14-gas-liquid separator, 15-first solenoid valve, 16-second Expansion valve, 17-battery heat pump subsystem heat exchanger, 18-third solenoid valve.

Detailed ways

The present invention will be described in further detail below in conjunction with accompanying drawing and specific embodiment:

Embodiment 1: As shown in Figures 1-2, an air-conditioning battery heat pump system includes an air-conditioning heat pump subsystem and a battery heat pump subsystem;

The air-conditioning heat pump subsystem includes a compressor 1, a gas-liquid separator 14, a four-way valve 5, a condenser 3 and an evaporator 10;

The four-way valve has 4 ports: D, E, S and C, where the D port is on the first side, and the E, S, C ports are on the second side, and the S port is between the E port and the C port;

The outlet of the compressor is connected to the D port of the four-way valve through the first one-way valve 2; the S port of the four-way valve is connected to the inlet of the gas-liquid separator through the second one-way valve 13, and the outlet of the gas-liquid separator is connected to the inlet of the compressor connected;

The E port of the four-way valve is connected to the first end of the condenser, the second end of the condenser is connected to the first end of the evaporator through the first solenoid valve 8 and the first expansion valve 9 in sequence, and the second end of the evaporator is connected through the fourth The solenoid valve 12 is connected to the C port of the four-way valve;

The battery heat pump subsystem includes a second solenoid valve 15, a battery heat pump subsystem heat exchanger 17, a second expansion valve 16 and a third solenoid valve 18;

The second end of the evaporator is connected to the C port of the four-way valve through the second solenoid valve, the second expansion valve, the first heat exchange channel of the battery heat pump subsystem heat exchanger, and the third solenoid valve; the battery heat pump subsystem The second heat exchange channel of the heat exchanger is connected in series in the battery cooling water circuit.

Both the first solenoid valve and the second solenoid valve are connected to the second end of the condenser through a dry filter.

A sight glass is arranged on the pipeline between the first solenoid valve or the second solenoid valve and the dry filter. Specifically, the first electromagnetic valve, the second electromagnetic valve and the dry filter are connected through a three-way pipe.

There are multiple heat exchangers in the battery heat pump subsystem, which are connected in parallel.

The evaporator is provided with an evaporating fan, and the condenser is provided with a condensing fan.

Both the first expansion valve and the second expansion valve are electronic expansion valves, and both the first expansion valve and the second expansion valve are connected with a driving circuit capable of voltage regulation. The heat demand of the two subsystems is distributed by adjusting the opening of the expansion valve through the driving circuit. Preferably, the two driving circuits are independent, that is, they can be controlled separately, and the expansion valve can also be a manual expansion valve.

The air-conditioning battery heat pump system further includes a controller, the controller is used to control the switching states of the solenoid valves and the four-way valve in the air-conditioning battery heat pump system, and is also used to control the opening and closing of the first expansion valve and the second expansion valve. Spend.

The controller is connected with a communication module. The communication module is used to transmit the on-site status to the upper computer or remote terminal, and the communication module is a wired or wireless communication module.

When the four-way valve is in the first state (power-off state or default state), the air-conditioning battery heat pump system works in the cooling state;

The first state refers to: the S and C ports of the four-way valve form a group of ports to communicate, and the D and E ports of the four-way valve form a second group of ports to communicate; the first group of ports and the second group of ports are connected to each other; Not connected between;

The air conditioner battery heat pump system works in the cooling state, including three working modes:

Working mode 1: individual air-conditioning refrigeration: require the first solenoid valve and the fourth solenoid valve to be connected, and require the evaporator to work;

Working mode 2: battery cooling alone; requires the second solenoid valve and the third solenoid valve to be connected.

Working mode 3: double cooling of the air conditioner battery; the first solenoid valve and the fourth solenoid valve are required to be connected, and the evaporator is required to work; and the second solenoid valve and the third solenoid valve are required to be connected. It can also be considered as a superposition of working mode 1 and working mode 2.

When the four-way valve is in the second state (energized state), the air-conditioning battery heat pump system works in the heating state; the second state refers to: the S and E ports of the four-way valve form a group of ports connected, and the four-way The D and C ports of the valve form the second group of ports and communicate with each other; the first group of ports and the second group of ports are not connected;

The air conditioner battery heat pump system works in the heating state, including three working modes:

Working mode I: independent air conditioning and heating: require the first solenoid valve and the fourth solenoid valve to be connected, and require the evaporator to work;

Working mode II: independent battery heating; requires the second solenoid valve and the third solenoid valve to be connected.

Working mode III: dual heating of the air conditioner battery; the first solenoid valve and the fourth solenoid valve are required to be turned on, and the evaporator is required to work; and the second solenoid valve and the third solenoid valve are required to be turned on. It can also be considered as a superposition of working mode I and working mode II.

The controller is single-chip microcomputer, DSP, PLCD and so on.

The battery heat pump subsystem of the air conditioner is mainly divided into two parts: the heat pump subsystem of the air conditioner and the heat pump subsystem of the battery; 1. The cooling principle of the battery heat pump subsystem of the air conditioner, see Figure 1:

1. Air conditioning heat pump subsystem (refrigeration):

The low-pressure refrigerant steam is sucked into the compressor, compressed into high-temperature and high-pressure steam, and enters the condenser through the first one-way valve and the four-way reversing valve (no electricity). In the condenser, the high-temperature and high-pressure steam is condensed into a high-pressure liquid. The heat discharged during condensation is discharged into the atmosphere by the condensation fan. The liquid refrigerant passes through the dry filter, the sight glass, the first solenoid valve (opened by power), and the first one-way valve, throttling into a low-temperature and low-pressure liquid, enters the evaporator, and absorbs the air passing through the evaporator in the evaporator The heat in the air is vaporized and becomes low-pressure steam, which returns to the compressor through the fourth solenoid valve (opened when powered on), four-way reversing valve (not powered), the second one-way valve and the gas-liquid separator, and completes a refrigeration cycle. At the same time, the cooled air is sent into the car by the evaporating fan, so as to achieve the purpose of cooling. Due to the continuous work of the compressor, the refrigeration cycle is continuously carried out, thus producing the effect of continuous refrigeration.

2. Battery heat pump subsystem (refrigeration):

The liquid refrigerant coming out of the sight glass passes through the three-way diversion, and part of it enters the battery heat pump subsystem, passes through the second solenoid valve (opened when powered on) and the second one-way valve, throttling it into a low-temperature and low-pressure liquid, and enters the battery heat pump sub-system The heat exchanger of the system absorbs the heat of the circulating water in the battery cooling water circuit in the heat exchanger of the battery heat pump subsystem and is vaporized to become low-pressure steam. The one-way valve and the gas-liquid separator return to the compressor to complete a refrigeration cycle. At the same time, the circulating water in the cooled battery cooling water circuit is pumped into the battery to cool the battery. Due to the continuous operation of the compressor, the refrigeration cycle is continuously carried out, thus producing the effect of continuous cooling of the battery.

Additional instructions: When the first solenoid valve and the fourth solenoid valve are in the power-off and closed state, the air-conditioning heat pump subsystem can be completely closed;

Similarly, when the second solenoid valve and the third solenoid valve are in the power-off closed state, the battery heat pump subsystem can be completely closed;

By applying different voltage values to the electronic expansion valve coil, the opening of the electronic expansion valve can be adjusted, thereby controlling the flow of the air-conditioning heat pump subsystem and the battery heat pump subsystem, so as to achieve a reasonable allocation of cooling capacity requirements of the two systems;

To sum up, the opening and closing states of the two systems can be controlled by controlling the closing of the first solenoid valve, the second solenoid valve, the third solenoid valve and the fourth solenoid valve; Therefore, the system can meet the cooling requirements of air conditioners and batteries under various working conditions, and has significant advantages such as reasonable distribution, quick response, and efficient utilization.

As shown in Figure 2, the heating principle of the battery heat pump subsystem of the air conditioner is explained:

1. Air conditioning heat pump subsystem (heating):

The low-pressure refrigerant steam is sucked into the compressor, compressed into high-temperature and high-pressure steam, and enters the evaporator through the first one-way valve, four-way reversing valve (reversing when energized), and the fourth solenoid valve (opening when energized). . In the evaporator, high-temperature and high-pressure steam is condensed into a high-pressure liquid. The heat discharged during condensation is sent into the car by the evaporating fan, thereby achieving the purpose of heating. The liquid refrigerant is throttled into a low-temperature and low-pressure liquid through the first one-way valve, enters the first solenoid valve (opened by power), the sight glass and the dry filter, and then enters the condenser, where it absorbs the refrigerant passing through the condenser. The heat in the air is vaporized and becomes low-pressure steam. At the same time, the cooled air is discharged into the atmosphere by the condensing fan. The low-pressure steam passes through the four-way reversing valve (electric reversing), the second one-way valve and the gas-liquid separator. , back to the compressor to complete a heating cycle. Due to the continuous operation of the compressor, the heating cycle is continuously carried out, thus producing the effect of continuous heating.

2. Battery heat pump subsystem (heating):

The high-temperature and high-pressure steam from the four-way reversing valve (reversing by power) passes through the three-way diversion, and part of it enters the battery cooling system, passes through the third solenoid valve (opened by power), and enters the heat exchanger of the battery heat pump subsystem. In the heat exchanger of the battery heat pump subsystem, the high-temperature and high-pressure steam is condensed into a high-pressure liquid, and the heat discharged during condensation is transferred to the circulating water in the battery cooling water circuit, and the circulating water that absorbs heat is pumped into the battery to achieve the purpose of heating the battery Purpose. The high-pressure liquid refrigerant enters the second one-way valve, is throttled into a low-temperature and low-pressure liquid, passes through the second solenoid valve (opened when powered on), sight glass and dry filter, and enters the condenser, where it absorbs and condenses The heat in the air of the device is gasified to become low-pressure steam. At the same time, the cooled air is discharged into the atmosphere by the condensing fan. The low-pressure steam passes through the four-way reversing valve (electric reversing), the second one-way valve and the gas-liquid Separator, back to the compressor to complete a heating cycle. Due to the continuous operation of the compressor, the heating cycle is continuously carried out, which produces the effect of continuous heating of the battery.

Additional instructions: When the fourth solenoid valve and the first solenoid valve are in the power-off and closed state, the air-conditioning heat pump subsystem can be completely closed;

Similarly, when the third solenoid valve and the second solenoid valve are in the power-off closed state, the battery heat pump subsystem can be completely closed;

By applying different voltage values to the coil of the electronic expansion valve, the opening of the electronic expansion valve can be adjusted, thereby controlling the flow of the air-conditioning heat pump subsystem and the battery heat pump subsystem, so as to achieve a reasonable distribution of the heat demand of the two systems;

To sum up, the opening and closing states of the two systems can be controlled by controlling the closing of the first solenoid valve, the second solenoid valve, the third solenoid valve and the fourth solenoid valve; The opening degree is used to distribute the heat demand of the two systems; therefore, the system can meet the heat demand of air conditioners and batteries under various working conditions, and has significant advantages such as reasonable distribution, quick response, and efficient utilization.

Claims (10)

1. An air-conditioning battery heat pump system, characterized in that it comprises an air-conditioning heat pump subsystem and a battery heat pump subsystem; The air-conditioning heat pump subsystem includes a compressor (1), a gas-liquid separator (14), a four-way valve (5), a condenser (3) and an evaporator (10); The four-way valve has 4 ports: D, E, S and C, where the D port is on the first side, and the E, S, C ports are on the second side, and the S port is between the E port and the C port; The outlet of the compressor is connected to the D port of the four-way valve through the first one-way valve (2); the S port of the four-way valve is connected to the inlet of the gas-liquid separator through the second one-way valve (13), and the outlet of the gas-liquid separator is connected to the The inlet of the compressor is connected; The E port of the four-way valve is connected to the first end of the condenser, and the second end of the condenser is connected to the first end of the evaporator through the first electromagnetic valve (8) and the first expansion valve (9) sequentially, and the second end of the evaporator The end is connected to the C port of the four-way valve through the fourth solenoid valve (12); The battery heat pump subsystem includes a second solenoid valve (15), a battery heat pump subsystem heat exchanger (17), a second expansion valve (16) and a third solenoid valve (18); The second end of the evaporator is connected to the C port of the four-way valve through the second solenoid valve, the second expansion valve, the first heat exchange channel of the battery heat pump subsystem heat exchanger, and the third solenoid valve; the battery heat pump subsystem The second heat exchange channel of the heat exchanger is connected in series in the battery cooling water circuit. 2. The air conditioner battery heat pump system according to claim 1, wherein the first solenoid valve and the second solenoid valve are both connected to the second end of the condenser through a dry filter. 3. The air-conditioning battery heat pump system according to claim 2, characterized in that a sight glass is provided on the pipeline between the first solenoid valve or the second solenoid valve and the dry filter. 4. The air-conditioning battery heat pump system according to claim 1, characterized in that there are multiple heat exchangers in the battery heat pump subsystem, which are connected in parallel. 5. The air conditioner battery heat pump system according to claim 1, wherein the evaporator is provided with an evaporating fan, and the condenser is provided with a condensing fan. 6. The air-conditioning battery heat pump system according to claim 1, characterized in that the first expansion valve and the second expansion valve are both electronic expansion valves, and both the first expansion valve and the second expansion valve are connected with voltage-adjustable Drive circuit. 7. The air-conditioning battery heat pump system according to claim 1, further comprising a controller, the controller is used to control the switch state of each electromagnetic valve and the switch state of the four-way valve in the air-condition battery heat pump system, and is also used to control The opening degrees of the first expansion valve and the second expansion valve. 8. The air conditioner battery heat pump system according to claim 7, wherein the controller is connected with a communication module. 9. The air-conditioning battery heat pump system according to any one of claims 1-8, characterized in that, when the four-way valve is in the first state (power-off state or default state), the air-conditioning battery heat pump system works in a cooling state; The first state refers to: the S and C ports of the four-way valve form a group of ports to communicate, and the D and E ports of the four-way valve form a second group of ports to communicate; the first group of ports and the second group of ports are connected to each other; Not connected between; The air conditioner battery heat pump system works in the cooling state, including three working modes: Working mode 1: individual air conditioning and refrigeration: the first solenoid valve and the fourth solenoid valve are required to be connected, and the evaporator is required to work; Working mode 2: battery cooling alone; requires the second solenoid valve and the third solenoid valve to be connected. Working mode 3: double cooling of the air conditioner battery; the first solenoid valve and the fourth solenoid valve are required to be connected, and the evaporator is required to work; and the second solenoid valve and the third solenoid valve are required to be connected. 10. The air-conditioning battery heat pump system according to any one of claims 1-8, characterized in that, when the four-way valve is in the second state (energized state), the air-conditioning battery heat pump system works in a heating state; The second state refers to: the S and E ports of the four-way valve form a group of ports to communicate, and the D and C ports of the four-way valve form a second group of ports to communicate; the first group of ports and the second group of ports are not connected ; The air conditioner battery heat pump system works in the heating state, including three working modes: Working mode I: independent air conditioning and heating: require the first solenoid valve and the fourth solenoid valve to be connected, and require the evaporator to work; Working mode II: independent battery heating; requires the second solenoid valve and the third solenoid valve to be connected. Working mode III: dual heating of the air conditioner battery; the first solenoid valve and the fourth solenoid valve are required to be turned on, and the evaporator is required to work; and the second solenoid valve and the third solenoid valve are required to be turned on.