Composite cooling system for engine generator of electric vehicle

Abstract

Provided is an engine generator composite heat dissipation system for an electric vehicle, comprising an engine, a permanent magnet generator, a composite radiator and an expansion water tank, wherein the composite radiator comprises an engine water cooling radiator and an engine intercooling radiator, wherein an intercooling radiator core and a permanent magnet generator water cooler module are arranged inside the engine intercooling radiator housing. The present invention adopts a composite radiator, utilizes a circulating water pump inside the engine as a power source, provides power for the permanent magnet generator heat dissipation, solves the heat dissipation problem of the permanent magnet generator cooling water channel without a power source, does not need to design a power structure for it separately, realizes the integrated heat dissipation of the engine and the permanent magnet generator, reduces the design cost, and improves the reliability of the system.

Description

Technical Field

[0001] The invention belongs to the technical field of heat dissipation systems, and in particular relates to an engine generator composite heat dissipation system for an electric vehicle. Background Art

[0002] The heat dissipation system of an electric rail vehicle is a key component of the vehicle power system. For an electric rail vehicle, it has an engine and a permanent magnet generator, and the engine and the permanent magnet generator each have their own heat dissipation system. Temperature has a great influence on the efficiency of the permanent magnet generator. Because the cooling water channel of the permanent magnet generator selected by the electric vehicle has no circulating power source, an external power source needs to be added separately to realize the heat dissipation cycle. At present, the permanent magnet generator mainly uses the traditional external circulation pump method to realize the circulation of the heat dissipation system. The design cost is high, and the system reliability depends on the performance of the circulation pump. The potential risk is large, which reduces the reliability of the system. Therefore, it is necessary to propose improvements. Summary of the invention

[0003] The technical problem solved by the present invention is to provide a composite heat dissipation system for an engine generator of an electric drive vehicle. The present invention adopts a composite radiator, and uses the circulating water pump inside the engine as a power source to provide power for the heat dissipation of the permanent magnet generator, thereby solving the heat dissipation problem of the permanent magnet generator without a power source in the cooling water channel. There is no need to design a power structure for it separately, thereby realizing the integrated heat dissipation of the engine and the permanent magnet generator, reducing the design cost and improving the reliability of the system. The technical solution adopted by the present invention is as follows: a composite heat dissipation system for an engine generator of an electric drive vehicle, comprising an engine, a permanent magnet generator, a composite radiator and an expansion water tank. The composite radiator comprises an engine water-cooled radiator and an engine intercooler radiator. An intercooler radiator core and a permanent magnet generator water cooler module are arranged in parallel inside the engine intercooler radiator housing. The intercooler air outlet on the engine intercooler radiator is connected to the engine air inlet through the engine intercooler air inlet pipe. The engine air outlet is connected to the intercooler air inlet on the engine intercooler radiator through the engine intercooler air outlet pipe. The cold air intake pipe and the engine intercooler air outlet pipe form an engine intercooler heat dissipation pipeline; the water cooling outlet on the engine water cooling radiator is connected to the engine water inlet through the engine water inlet pipe, and the engine water outlet is connected to the water cooling water inlet on the engine water cooling radiator through the engine water outlet pipe, and the engine water inlet pipe and the engine water outlet pipe form an engine water cooling heat dissipation pipeline; the composite water inlet of the permanent magnet generator water cooler module and the water outlet end of the engine water circulation pump are connected through a water intake pipe, and the composite water outlet of the permanent magnet generator water cooler module and the permanent magnet generator water inlet are connected through the radiator outlet pipe, and the permanent magnet generator outlet is connected to the engine water circulation pump inlet through a return pipe, and the water intake pipe, the radiator outlet pipe and the return pipe form a permanent magnet generator heat dissipation pipeline.

[0004] Further limitation of the above technical scheme is that the engine water-cooled radiator of the composite radiator is provided with a water-cooled exhaust port, and the composite radiator is provided with a composite water exhaust port corresponding to the permanent magnet generator water cooler module; the composite radiator also includes a radiator shell, and the radiator shell is provided with a set of internal heat sinks corresponding to the engine water-cooled radiator, the engine intercooler radiator and the permanent magnet generator water cooler module, respectively, and the fan is arranged at the rear of the internal heat sink, and the fan is shielded by a fan protective cover, and the drive motor is installed at the rear end of the fan protective cover, and the output end of the drive motor is connected to the input end of the fan to drive it to rotate, the drive motor is powered by a three-phase AC power supply and controlled by a DC 24V power supply, and the drive motor controls the start and stop of the fan through the integrated junction box wiring, the internal heat sink adopts an aluminum plate-fin structure, and the fan adopts a blowing fan or a suction fan, wherein the core of the engine intercooler radiator and the permanent magnet generator water cooler module are arranged in parallel and their ventilation and cooling are controlled by a fan.

[0005] To further limit the above technical solution, the exhaust port I of the expansion water tank is connected to the engine exhaust port through the engine exhaust pipe, the exhaust port II and the exhaust port III of the expansion water tank are connected to the composite radiator exhaust port through the radiator exhaust pipe I and the radiator exhaust pipe II respectively, the water filling port of the expansion water tank is connected to the engine water filling port through the engine water filling pipe, the expansion water tank is also provided with an expansion water tank overflow pipe, and the expansion water tank is provided with a liquid level mirror and a pressure relief valve.

[0006] The advantages of the present invention compared with the prior art are:

[0007] 1. This scheme adopts a composite radiator, including an engine water-cooled radiator and an engine intercooler radiator, wherein an intercooler radiator core and a permanent magnet generator water cooler module are arranged in parallel inside the engine intercooler radiator shell, and the engine water-cooled radiator is divided into two sub-pipelines, namely, an engine water-cooled heat dissipation pipeline and a permanent magnet generator heat dissipation pipeline. The heat dissipation principle of the permanent magnet generator water cooling system is: using the circulating water pump inside the engine as the power source, a part of the cooling water is taken from the engine cylinder block and enters the permanent magnet generator water cooler module, and enters the permanent magnet generator heat dissipation pipeline after heat dissipation. After the cooling water cools the permanent magnet generator, it returns to the water inlet of the engine circulating water pump to participate in the next cycle, thereby solving the heat dissipation problem of the permanent magnet generator cooling water channel without a power source, realizing the integrated heat dissipation of the engine and the permanent magnet generator, reducing the design cost, and improving the reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a structural front view of the present invention;

[0009] Figure 2 A bottom view of the structure of the present invention;

[0010] Figure 3 It is a right side view of the structure of the present invention;

[0011] Figure 4 It is a structural schematic diagram of the composite radiator in the present invention;

[0012] Figure 5 It is a structural front view of the composite radiator in the present invention;

[0013] Figure 6 It is a schematic diagram of the exploded structure of the composite radiator of the present invention;

[0014] Figure 7 It is a structural schematic diagram of the expansion water tank in the present invention;

[0015] Figure 8 It is the principle diagram of the heat dissipation system of the present invention;

[0016] Fig. 9 The present invention is a performance curve diagram of an engine circulating water pump. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The connection methods of the various components in the following embodiments are conventional connection methods unless otherwise specified; the components used in the following embodiments are commercially available unless otherwise specified.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "set", and "provided with" should be understood in a broad sense. For example, it can be fixedly connected or set, or it can be detachably connected or set, or it can be connected or set in one piece. It can be mechanically connected; it can be directly connected or indirectly connected through other intermediate components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] See also Figure 1-9 , describing an embodiment of the present invention.

[0020] Engine generator composite cooling system for electric vehicles, such as Figure 1-5As shown, it includes an engine 1, a permanent magnet generator 2, a composite radiator 3 and an expansion water tank 4, wherein the composite radiator 3 includes an engine water cooling radiator 17 and an engine intercooling radiator 18, wherein an intercooling radiator core and a permanent magnet generator water cooler module 19 are arranged in parallel inside the shell of the engine intercooling radiator 18; an intercooling air outlet 24 on the engine intercooling radiator 18 is connected to an engine 1 air inlet through an engine intercooling air inlet pipe 6, and an engine 1 air outlet is connected to an intercooling air inlet 23 on the engine intercooling radiator 18 through an engine intercooling air outlet pipe 5, and the engine intercooling air inlet pipe 6 and the engine intercooling air outlet pipe 5 form a The engine intercooling heat dissipation pipeline is formed; the water cooling outlet 20 on the engine water cooling radiator 17 is connected to the water inlet of the engine 1 through the engine water inlet pipe 8, and the water outlet of the engine 1 is connected to the water cooling water inlet 21 on the engine water cooling radiator 17 through the engine water outlet pipe 7, and the engine water inlet pipe 8 and the engine water outlet pipe 7 form the engine water cooling heat dissipation pipeline; the composite water inlet 25 of the permanent magnet generator water cooler module 19 and the water outlet end of the water circulation pump of the engine 1 are connected through the water intake pipe 9, the composite water outlet 26 of the permanent magnet generator water cooler module 19 and the water inlet of the permanent magnet generator 2 are connected through the radiator outlet pipe 10, and the water outlet of the permanent magnet generator 2 is connected to the water inlet of the water circulation pump of the engine 1 through the return pipe 11, and the water intake pipe 9, the radiator outlet pipe 10 and the return pipe 11 form the permanent magnet generator heat dissipation pipeline.

[0021] like Figure 6 As shown, the engine water-cooled radiator 17 of the composite radiator 3 is provided with a water-cooled exhaust port 22, and the composite radiator 3 is provided with a composite water exhaust port 27 corresponding to the permanent magnet generator water cooler module 19; the composite radiator 3 also includes a radiator shell 28, and the radiator shell 28 is provided with a set of internal heat sinks 29 corresponding to the engine water-cooled radiator 17, the engine intercooler radiator 18 and the permanent magnet generator water cooler module 19, respectively, and a fan 30 is provided at the rear of the internal heat sink 29, and the fan 30 is shielded by a fan guard 31, and the drive motor 3 2 is installed at the rear end of the fan protective cover 31, the output end of the drive motor 32 is connected to the input end of the fan 30 to drive it to rotate, the drive motor 32 is powered by a three-phase AC power supply and controlled by a DC 24V power supply, the drive motor 32 is connected through an integrated junction box 33 to control the start and stop of the fan 30, the internal heat sink 29 adopts an aluminum plate-fin structure, and the fan 30 adopts a blowing fan or a suction fan, wherein the core of the engine intercooler radiator 18 and the permanent magnet generator water cooler module 19 are arranged in parallel and their ventilation and cooling are controlled by a fan.

[0022] like Figure 2As shown, the exhaust port I of the expansion water tank 4 is connected to the exhaust port of the engine 1 through the engine exhaust pipe 12, the exhaust port II and the exhaust port III of the expansion water tank 4 are connected to the exhaust port of the composite radiator 3 through the radiator exhaust pipe I 13 and the radiator exhaust pipe II 14 respectively, the water replenishment port of the expansion water tank 4 is connected to the water replenishment port of the engine 1 through the engine water replenishment pipe 15, and the expansion water tank 4 is also provided with an expansion water tank overflow pipe 16, as shown in FIG. Figure 7 As shown, the expansion water tank is provided with a liquid level mirror 34 and a pressure relief valve 35.

[0023] The present invention adopts a composite radiator, including an engine water cooling radiator 17 and an engine intercooling radiator 16, wherein an intercooling radiator core and a permanent magnet generator water cooler module 19 are arranged in parallel inside the shell of the engine intercooling radiator 18, and the engine water cooling radiator 17 is divided into two sub-pipelines, namely, an engine water cooling heat dissipation pipeline and a permanent magnet generator heat dissipation pipeline. The heat dissipation principle of the permanent magnet generator water cooling system is as follows: Figure 8 As shown, the circulating water pump inside the engine 1 is used as the power source, and a portion of cooling water is taken from the cylinder of the engine 1 and enters the water cooler module of the permanent magnet generator 2. After heat dissipation, it enters the heat dissipation pipeline of the permanent magnet generator. After the cooling water cools the permanent magnet generator 2, it returns to the water inlet of the circulating water pump of the engine 1 to participate in the next cycle. The heat dissipation problem of the permanent magnet generator cooling water channel without a power source is solved, and the integrated heat dissipation of the engine and the permanent magnet generator is realized, the design cost is reduced, and the reliability of the system is improved.

[0024] The circulating water pump of the engine 1 has different flow rates at different speeds. In order to avoid excessive water intake by the permanent magnet generator 2 for heat dissipation, which would affect the performance of the engine 1, it is particularly important to control the amount of water intake by the permanent magnet generator 2 for heat dissipation. Fig. 9 The figure below shows the engine water pump performance curve. The following table shows the cooling water flow and pressure difference required for each speed of the permanent magnet generator:

[0025] It can be seen from the diagram that the permanent magnet generator 2 takes cooling water as required without affecting the performance of the engine 1. In the present invention, water pipes with different diameters are used to control the water flow rate for cooling the permanent magnet generator 2.

[0026] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0027] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An engine-generator composite heat dissipation system for an electric vehicle, comprising an engine (1), a permanent magnet generator (2), a composite radiator (3) and an expansion water tank (4), characterized in that: The composite radiator (3) comprises an engine water-cooled radiator (17) and an engine intercooled radiator (18); an intercooled radiator core and a permanent magnet generator water cooler module (19) are arranged in parallel inside a shell of the engine intercooled radiator (18); an intercooled air outlet (24) on the engine intercooled radiator (18) is connected to an engine (1) air inlet via an engine intercooled air inlet pipe (6); the engine (1) air outlet is connected to an intercooled air inlet (23) on the engine intercooled radiator (18) via an engine intercooled air outlet pipe (5); the engine intercooled air inlet pipe (6) and the engine intercooled air outlet pipe (5) form an engine intercooled heat dissipation pipeline; the engine water-cooled The water cooling outlet (20) on the radiator (17) is connected to the water inlet of the engine (1) via an engine water inlet pipe (8); the water outlet of the engine (1) is connected to the water cooling inlet (21) on the engine water cooling radiator (17) via an engine water outlet pipe (7); the engine water inlet pipe (8) and the engine water outlet pipe (7) form an engine water cooling heat dissipation pipeline; the composite water inlet (25) of the permanent magnet generator water cooler module (19) is connected to the water outlet of the water circulation pump of the engine (1) via a water intake pipe (9); the composite water outlet (26) of the permanent magnet generator water cooler module (19) is connected to the water inlet of the permanent magnet generator (2) via a radiator water outlet pipe (10); the water outlet of the permanent magnet generator (2) is connected to the water inlet of the water circulation pump of the engine (1) via a return pipe (11); the water intake pipe (9), the radiator water outlet pipe (10) and the return pipe (11) form a permanent magnet generator heat dissipation pipeline; The engine water-cooling radiator (17) of the composite radiator (3) is provided with a water-cooling exhaust port (22), and the composite radiator (3) is provided with a composite water exhaust port (27) corresponding to the permanent magnet generator water cooler module (19); the composite radiator (3) further comprises a radiator housing (28), and the radiator housing (28) is provided with a set of internal heat sinks (29) corresponding to the engine water-cooling radiator (17), the engine intercooling radiator (18) and the permanent magnet generator water cooler module (19), respectively; a fan (30) is provided at the rear of the internal heat sink (29), and the fan (30) is provided with a fan protection The fan is shielded by a protective cover (31), a drive motor (32) is installed at the rear end of the fan protective cover (31), an output end of the drive motor (32) is connected to an input end of the fan (30) to drive the fan (30) to rotate, the drive motor (32) is powered by a three-phase AC power supply, the drive motor (32) is connected to an integrated junction box (33) to control the start and stop of the fan (30), the internal heat sink (29) is an aluminum plate-fin structure, and the fan (30) is a blowing fan or a suction fan; wherein the core of the engine intercooler radiator (18) and the permanent magnet generator water cooler module (19) are arranged in parallel.

2. The engine generator composite heat dissipation system for electric vehicles according to claim 1, characterized in that: The exhaust port I of the expansion water tank (4) is connected to the exhaust port of the engine (1) via the engine exhaust pipe (12); the exhaust port II and the exhaust port III of the expansion water tank (4) are connected to the exhaust port of the composite radiator (3) via the radiator exhaust pipe I (13) and the radiator exhaust pipe II (14), respectively; the water supply port of the expansion water tank (4) is connected to the water supply port of the engine (1) via the engine water supply pipe (15); the expansion water tank (4) is also provided with an expansion water tank overflow pipe (16); and the expansion water tank (4) is provided with a liquid level mirror (34) and a pressure relief valve (35).

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