Refrigerating system driven by combination of waste heat of waste gas

Abstract

The utility model discloses a refrigerating system driven by combining waste gas waste heat, which relates to engine waste heat recovery and comprises an electric compressor, a condenser, a working medium pump, an evaporator, a heater and an ejector. An outlet of the electric compressor is connected with an inlet of the condenser, an outlet of the condenser is connected with an inlet of the evaporator, and an outlet of the evaporator is connected with an inlet of the electric compressor to form a compression type refrigeration path; an outlet of the ejector is connected with an inlet of the condenser, an outlet of the condenser is connected with a pumping gas inlet of the ejector through the evaporator, the outlet of the condenser is connected with a working medium pump, an outlet of the working medium pump is connected with an inlet of the heater, and an outlet of the heater is connected with a driving gas inlet of the ejector, so that an ejection type refrigeration path is formed; the injection type refrigeration path and the electric compressor form a compression-injection type refrigeration path. The waste heat recovery system effectively recovers waste heat of waste gas, further improves the utilization rate of energy, and improves the comprehensive performance of the whole vehicle.

Description

Technical Field

[0001] The utility model relates to engine waste heat recovery, and more specifically, to a refrigeration system driven by waste heat of exhaust gas. Background Art

[0002] The refrigeration system of a hybrid vehicle needs to provide cooling to the engine and battery pack while ensuring the driving environment is comfortable, so as to ensure that the vehicle operates in a safe temperature environment and maintains optimal performance under various conditions. Currently, most hybrid vehicles use a compression refrigeration cycle. Unlike traditional fuel vehicles, electric compressors are used instead of belt-driven compressors. Since electric compressors are highly dependent on electricity, they need to consume the power of the battery pack, thus affecting the vehicle's range. Therefore, reducing the power consumption of the refrigeration system has an important impact on the power output and economy of the vehicle.

[0003] Only about one-third of the heat generated by engine fuel combustion is effectively utilized, and most of the other energy is lost through engine cooling and high-temperature exhaust heat, resulting in energy waste and environmental pollution. Therefore, we proposed a refrigeration system driven by exhaust gas waste heat, aiming to use the recovered engine exhaust gas waste heat as a heat source to drive the car's refrigeration system, thereby achieving car refrigeration. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a refrigeration system driven by waste heat of exhaust gas in view of the deficiencies of the prior art, so as to effectively recover the waste heat of exhaust gas and further improve the utilization rate of energy, thereby improving the comprehensive performance of the whole vehicle.

[0005] The utility model discloses a refrigeration system driven by waste heat of exhaust gas, comprising an electric compressor, a condenser, a working fluid pump and an evaporator, and also comprising a heater and an ejector;

[0006] The outlet of the electric compressor is connected to the inlet of the condenser, the outlet of the condenser is connected to the inlet of the evaporator, and the outlet of the evaporator is connected to the inlet of the electric compressor to form a compression refrigeration path;

[0007] The outlet of the ejector is connected to the inlet of the condenser, and the outlet of the condenser is connected to the pumping gas inlet of the ejector through the evaporator. The outlet of the condenser is also connected to a working fluid pump, and the outlet of the working fluid pump is connected to the inlet of the heater, and the heater is connected to the exhaust pipe of the engine. The outlet of the heater is connected to the driving gas inlet of the ejector to form an ejection refrigeration path;

[0008] The injection refrigeration path and the electric compressor constitute a compression-injection refrigeration path.

[0009] As a further improvement, an expansion valve is installed on the pipeline between the condenser and the evaporator.

[0010] As a further improvement, an electric three-way valve is provided between the ejector, the condenser and the electric compressor, one end of the electric three-way valve is connected to the outlet of the ejector, the other end of the electric three-way valve is connected to the inlet of the condenser, and the third port of the electric three-way valve is connected to the inlet of the electric compressor.

[0011] Furthermore, an electric three-way valve 2 is provided between the ejector, the evaporator and the electric compressor, one end of the electric three-way valve 2 is connected to the pumped gas inlet of the ejector, the other end of the electric three-way valve 2 is connected to the outlet of the evaporator, and the third port of the electric three-way valve 2 is connected to the inlet of the electric compressor.

[0012] Furthermore, the electric three-way valve 1 and the electric three-way valve 2 are electrically connected to a controller at the same time.

[0013] Furthermore, the electric compressor is electrically connected to a battery of the hybrid vehicle.

[0014] Furthermore, the battery is electrically connected to a power monitor, and the power monitor is electrically connected to a signal collection end of the controller.

[0015] Beneficial Effects

[0016] The advantages of the utility model are:

[0017] (1) Recycling the waste heat from the engine exhaust as the input heat source for the refrigeration system reduces the temperature of the exhaust gas, is more environmentally friendly, saves energy and reduces emissions while also improving energy utilization.

[0018] (2) A heater and an ejector are added to the traditional steam compression refrigeration system. In the compression-injection refrigeration mode, the working gas pressure before entering the electric compressor is increased due to the action of the ejector, which can reduce the operating power consumption of the compressor and the power consumption of the refrigeration system, thereby reducing the electric compressor's dependence on electricity. The cooling coefficient is also improved, making the energy consumption of the entire vehicle lower.

[0019] (3) The system controller can switch between compression cooling mode, injection cooling mode and compression-injection cooling mode according to the battery power information, charging and discharging status and the engine working status, so as to meet the vehicle's cooling needs under different driving conditions and avoid the situation where the cooling demand is reduced due to insufficient battery power. While providing a comfortable driving environment, it also meets the heat dissipation requirements of the engine and battery pack, thereby ensuring the safety and efficiency of the operation of the entire vehicle system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the refrigeration system structure of the utility model.

[0021] Among them: 1-electric compressor, 2-condenser, 3-expansion valve, 4-evaporator, 5-working fluid pump, 6-heater, 7-exhaust pipe, 8-injector, 9-electric three-way valve 2, 10-electric three-way valve 1, 11-controller, 12-battery, 13-power monitor. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the embodiments, but does not constitute any limitation to the utility model. Any limited modifications made by anyone within the scope of the claims of the utility model are still within the scope of the claims of the utility model.

[0023] See also Figure 1 The utility model discloses a refrigeration system driven by waste heat of exhaust gas. The core of the system is a refrigeration system driven by waste heat of exhaust gas, that is, the waste heat of exhaust gas is fully utilized to provide energy supply for the refrigeration system, so as to recycle and utilize the heat energy of automobile exhaust gas to a greater extent.

[0024] The system consists of a refrigeration part and a control part. The refrigeration part consists of an electric compressor 1, a condenser 2, a working fluid pump 5, an expansion valve 3, an evaporator 4, an ejector 8, a heater 6 and an exhaust pipe 7. The control part consists of a battery 12, a power monitor 13, a controller 11 and two electric three-way valves. By controlling the two electric three-way valves, the system can realize refrigeration of three refrigeration paths, namely, a compression refrigeration path, an ejection refrigeration path, and a compression-injection refrigeration path.

[0025] Compression refrigeration path: the outlet of the electric compressor 1 is connected to the inlet of the condenser 2, the outlet of the condenser 2 is connected to the inlet of the expansion valve 3, the outlet of the expansion valve 3 is connected to the inlet of the evaporator 4, and the outlet of the evaporator 4 is connected to the inlet of the electric compressor 1, completing the refrigeration cycle. In this refrigeration path, the battery 12 provides energy to drive the electric compressor 1 to work, thereby producing cold capacity.

[0026] Injection refrigeration path: The outlet of the ejector 8 is connected to the inlet of the condenser 2, and the outlet of the condenser 2 is divided into two branches. The first branch is connected to the inlet of the expansion valve 3, and the outlet of the expansion valve 3 is connected to the inlet of the evaporator 4. The working fluid at the outlet of the evaporator 4 serves as the ejected fluid and enters the pumping gas inlet of the ejector 8; the second branch is connected to the inlet of the working fluid pump 5, and the outlet of the working fluid pump 5 is connected to the inlet of the heater 6, and the outlet of the heater 6 is connected to the driving gas inlet of the ejector 8. After the fluids of the two branches are mixed in the ejector 8, they are ejected at the outlet of the ejector 8 to complete the refrigeration cycle. This refrigeration path is only powered by the waste heat of the exhaust gas to produce cooling capacity.

[0027] Compression-injection refrigeration path: Based on the injection refrigeration cycle, the working fluid at the outlet of the ejector 8 first enters the electric compressor 1, and then flows into the condenser 2 for condensation. The path after the outlet of the condenser 2 is consistent with the above-mentioned injection refrigeration cycle. This refrigeration path is jointly provided with energy by the waste heat of the exhaust gas of the exhaust pipe 7 and the battery 12, thereby producing cooling capacity.

[0028] The power monitor 13 in the control part is used to collect the power information and charging and discharging status of the battery 12 of the car, and upload the power information and charging and discharging status of the battery 12 to the controller 11. The controller 11 controls the electric three-way valve 10 and the electric three-way valve 2 9 according to the uploaded information, and controls the power supply of the battery 12 to the electric compressor 1. In this article, the control method of the control part is:

[0029] When the SOC of the battery 12 is high, the vehicle engine is not working, and the vehicle is driven in pure electric mode, the vehicle does not generate waste heat from exhaust gas. The controller 11 controls the inlet and outlet of the electric three-way valve 10 to be closed, and the outlet of the electric three-way valve 2 9 is connected to the inlet of the electric compressor 1. At this time, the refrigeration system is in compression refrigeration mode, and the battery 12 provides energy to drive the electric compressor 1 to work.

[0030] When the SOC of the battery 12 is low and the engine drives the generator to charge the battery 12, the battery 12 is in a charging state. The battery 12 stops supplying power to the electric compressor 1, and the outlet of the electric three-way valve 10 is connected to the inlet of the condenser 2, and the outlet of the electric three-way valve 29 is connected to the pumping gas inlet of the ejector 8. At this time, the refrigeration system is in the ejection refrigeration mode, and the refrigeration system is driven only by the waste heat of the exhaust gas.

[0031] When the SOC of the battery 12 is high and the car engine is working, the battery 12 supplies power to the electric compressor 1, and connects the outlet of the electric three-way valve 10 to the inlet of the electric compressor 1, and both outlets of the electric three-way valve 2 9 are opened. At this time, the refrigeration system is in compression-injection mode, and the battery 12 and the waste heat of the exhaust gas provide energy for the refrigeration system at the same time.

[0032] Furthermore, the function of the exhaust pipe 7 in the system is to transport the waste heat of the exhaust gas to the heater 6 to provide a heating source for the system; the function of the electric three-way valve is to switch the position of the valve, which can change the inlet and outlet of the fluid, thereby changing the flow direction of the working fluid. The use of an electric three-way valve can reduce the number of valves, which not only reduces weight but also reduces costs.

[0033] The refrigeration system adds a heater 6 and an ejector 8 to the traditional automotive vapor compression refrigeration system, and realizes the switching of different refrigeration modes by controlling two electric three-way valves. The ejector 8 is an important component of the system. After the working fluid is heated by the heater 6, it becomes a high-temperature and high-pressure driving gas and enters the ejector 8, and the gas with a lower pressure in the evaporator 4 is injected into the mixing chamber of the ejector 8 for mixing. Finally, the mixed gas is ejected at a pressure higher than the driving gas entering the mixing chamber.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A refrigeration system driven by waste heat of exhaust gas, comprising an electric compressor (1), a condenser (2), a working fluid pump (5) and an evaporator (4), characterized in that: Also includes a heater (6) and an ejector (8); The outlet of the electric compressor (1) is connected to the inlet of the condenser (2), the outlet of the condenser (2) is connected to the inlet of the evaporator (4), and the outlet of the evaporator (4) is connected to the inlet of the electric compressor (1), so as to form a compression refrigeration path; The outlet of the ejector (8) is connected to the inlet of the condenser (2), the outlet of the condenser (2) is connected to the pumping gas inlet of the ejector (8) through the evaporator (4), the outlet of the condenser (2) is also connected to a working fluid pump (5), the outlet of the working fluid pump (5) is connected to the inlet of the heater (6), the heater (6) is connected to the exhaust pipe (7) of the engine, and the outlet of the heater (6) is connected to the driving gas inlet of the ejector (8), thereby forming an ejection refrigeration path; The injection refrigeration path and the electric compressor (1) constitute a compression-injection refrigeration path.

2. A refrigeration system driven by exhaust gas waste heat according to claim 1, characterized in that: An expansion valve (3) is installed on the pipeline between the condenser (2) and the evaporator (4).

3. The refrigeration system driven by exhaust gas waste heat according to claim 1, characterized in that: An electric three-way valve (10) is provided between the ejector (8), the condenser (2) and the electric compressor (1); one end of the electric three-way valve (10) is connected to the outlet of the ejector (8), the other end of the electric three-way valve (10) is connected to the inlet of the condenser (2), and the third port of the electric three-way valve (10) is connected to the inlet of the electric compressor (1).

4. A refrigeration system driven by exhaust gas waste heat according to claim 3, characterized in that: An electric three-way valve 2 (9) is provided between the ejector (8), the evaporator (4) and the electric compressor (1); one end of the electric three-way valve 2 (9) is connected to the pumping gas inlet of the ejector (8), the other end of the electric three-way valve 2 (9) is connected to the outlet of the evaporator (4), and the third port of the electric three-way valve 2 (9) is connected to the inlet of the electric compressor (1).

5. A refrigeration system driven by exhaust gas waste heat according to claim 4, characterized in that: The electric three-way valve 1 (10) and the electric three-way valve 2 (9) are electrically connected to a controller (11) at the same time.

6. A refrigeration system driven by exhaust gas waste heat according to claim 5, characterized in that: The electric compressor (1) is electrically connected to a battery (12) of a hybrid vehicle.

7. A refrigeration system driven by exhaust gas waste heat according to claim 6, characterized in that: The battery (12) is electrically connected to a power monitor (13), and the power monitor (13) is electrically connected to a signal collection end of the controller (11).

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