A multi-stage cooling system for an electric drive system and a pure electric sanitation vehicle

Abstract

The utility model discloses a multi-stage cooling system for an electric drive system and a pure electric sanitation vehicle, wherein the cooling system comprises: an expansion water tank for storing and recovering coolant; a cooling water pump connected to the expansion water tank for pressurizing the coolant to make the coolant flow; a first cooling water pipe connected to the cooling water pump, arranged around a motor controller group, and used for cooling the motor controller group; a clean water tank for storing clean water for spraying; a first cooling water pipe passing through the clean water tank, and used for cooling the first cooling water pipe; a second cooling water pipe, connected to the first cooling water pipe, and used for obtaining the coolant of the first cooling water pipe after cooling through the clean water tank, and arranged around a motor group, and used for cooling the motor group; a radiator assembly, arranged at a water outlet end of the second cooling water pipe, and used for cooling the second cooling water pipe, and the water outlet end of the second cooling water pipe is connected to the expansion water tank, and used for recovering the coolant after cooling through the radiator assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of cooling systems, and in particular to a multi-stage cooling system for an electric drive system and a pure electric sanitation vehicle. Background Art

[0002] Existing pure electric sanitation vehicles are driven by an electric drive system. Since the electric drive system generates heat during operation, it needs to be cooled by a cooling system to ensure the safe operation of the vehicle.

[0003] The existing pure electric sanitation vehicle cooling system generally adopts a series connection method, connecting the motors and motor controllers in the electric drive system in series into a cooling loop. When the cooling medium flows through the electric drive components, the heat in the electric drive system is taken out through heat transfer, causing the temperature of the cooling medium to rise. This will cause the electric drive system located in the front half of the cooling system loop to have a better cooling effect, and the temperature rise of the components of the electric drive system in the front half will not change too much. However, for the electric drive system located in the back half of the cooling system loop, the cooling medium has absorbed the heat of the electric drive system in the front half at this time, resulting in a higher temperature of the cooling medium. When flowing through the electric drive system in the back half of the cooling system loop, the heat that can be taken away is limited, resulting in a faster temperature rise in the electric drive system in the back half of the cooling system loop, which is prone to overheating.

[0004] At the same time, in order to achieve a better cooling effect, the cooling fan of the cooling system needs to run at full speed continuously during operation, which consumes the electric energy of the pure electric sanitation vehicle and reduces the endurance of the pure electric sanitation vehicle.

[0005] The purpose of the present invention is to design a multi-stage cooling system for an electric drive system and a pure electric sanitation vehicle in view of the above-mentioned problems in the prior art. Utility Model Content

[0006] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a multi-stage cooling system for an electric drive system and a pure electric sanitation vehicle, which can solve the above-mentioned technical problems.

[0007] The utility model provides a multi-stage cooling system for an electric drive system, which is used for an electric drive system of a pure electric sanitation vehicle. The electric drive system comprises: an on-board controller, a motor controller group, and a motor group which are electrically connected in sequence, and are used for the electric drive of various mechanisms of the pure electric sanitation vehicle;

[0008] The cooling system comprises:

[0009] Expansion tank for storing and recovering coolant;

[0010] a cooling water pump connected to the expansion water tank and used to pressurize the coolant so that the coolant flows;

[0011] A first cooling water pipe, connected to the cooling water pump, disposed around the motor controller group, and used for cooling the motor controller group;

[0012] A clean water tank, used to store clean water for spraying; the first cooling water pipe passes through the clean water tank, which is used to cool the first cooling water pipe;

[0013] A second cooling water pipe, connected to the first cooling water pipe, used to obtain the coolant of the first cooling water pipe after cooling down through the clean water tank, and arranged around the motor group to cool down the motor group;

[0014] The radiator assembly is arranged at the water outlet of the second cooling water pipe and is used for cooling the second cooling water pipe. The water outlet of the second cooling water pipe is connected to the expansion water tank and is used for recovering the coolant after cooling by the radiator assembly.

[0015] Furthermore, an inlet hole and an outlet hole are respectively provided on both sides of the top of the clean water tank for the first cooling water pipe to pass in and out.

[0016] Furthermore, the first cooling water pipe is spirally shaped in the clean water tank.

[0017] Furthermore, rubber rings are respectively provided inside the inlet hole and the outlet hole to prevent wear of the first cooling water pipe.

[0018] Furthermore, the radiator assembly comprises:

[0019] A radiator, wherein the second cooling water pipe passes through the radiator and is used for cooling the second cooling water pipe;

[0020] A cooling fan is arranged at the air inlet of the radiator to assist in cooling the second cooling water pipe.

[0021] Furthermore, the cooling fan is connected to the vehicle-mounted controller for controlling the opening and closing and the speed of the cooling fan according to the temperature.

[0022] Furthermore, the vehicle-mounted controller is connected to a coolant temperature sensor, and the coolant temperature sensor is arranged on the second cooling water pipe to obtain the temperature of the second cooling water pipe.

[0023] Furthermore, the vehicle-mounted controller is connected to a motor temperature sensor group, and the motor temperature sensor group is arranged on the motor group to obtain the temperature of the motor group.

[0024] Furthermore, the vehicle-mounted controller is connected to a motor controller temperature sensor group, and the motor controller temperature sensor group is arranged on the motor controller group to obtain the temperature of the motor controller group.

[0025] The utility model provides a pure electric sanitation vehicle, comprising a multi-stage cooling system for an electric drive system.

[0026] The utility model has the following advantages:

[0027] First, the first cooling water pipe passes around the motor controller group to take away the heat of the motor controller group. At this time, the temperature of the coolant in the first cooling water pipe has increased. At this time, continuing to use the coolant in the first cooling water pipe for the heat dissipation of the subsequent motor group cannot achieve the previous cooling effect. Therefore, after passing through the motor controller group, the first cooling water pipe is placed in a clean water tank for cooling to ensure that it flows into the second cooling water pipe, which has a better heat conduction effect and can better and faster reduce the temperature of the rear motor group of the electric drive system.

[0028] The second is to cool the second cooling water pipe through the radiator assembly. The coolant flowing out of the clean water tank cools the motor unit through the second cooling water pipe. At this time, the coolant temperature in the second cooling water pipe has increased. If the expansion water tank is directly recovered, the coolant temperature inside the water tank will increase. It is necessary to cool the coolant before entering the expansion water tank. Therefore, a radiator assembly is set at this position to cool down through air conduction to ensure that the coolant entering the expansion water tank has been cooled, thereby achieving multi-stage cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 is a diagram of a multi-stage cooling system in an embodiment.

[0031] Figure 2 is a diagram of an electric drive system in an embodiment.

[0032] Figure 3 It is a clean water tank structural diagram in the embodiment.

[0033] Figure 4 Schematic diagram of a cooling fan in an embodiment. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is particularly noted that the following embodiments are only used to illustrate the present invention, but do not limit the scope of the present invention. Similarly, the following embodiments are only partial embodiments of the present invention rather than all embodiments. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] like Figure 1 As shown, the present solution provides a multi-stage cooling system for an electric drive system, comprising:

[0036] An electric drive system for a pure electric sanitation vehicle, such as Figure 2 As shown, the electric drive system includes: an on-board controller, a motor controller group, and a motor group electrically connected in sequence, and used for electric driving of various mechanisms of the pure electric sanitation vehicle;

[0037] In this embodiment, if Figure 2 As shown, the motor group includes: a fan motor, a high-pressure water pump motor, a low-pressure water pump motor, an oil pump motor, and a sweeping disc motor; the motor controller group includes: a fan motor controller, a high-pressure water pump motor controller, a low-pressure water pump motor controller, an oil pump motor controller, and a sweeping disc motor controller; wherein the vehicle-mounted controller is connected to the motor controller group via CAN communication, or is connected to the motor controller group via an all-in-one controller to realize electric drive control of the entire vehicle.

[0038] The cooling system comprises:

[0039] Expansion tank for storing and recovering coolant;

[0040] a cooling water pump connected to the expansion water tank and used to pressurize the coolant so that the coolant flows;

[0041] A first cooling water pipe, connected to the cooling water pump, disposed around the motor controller group, and used for cooling the motor controller group;

[0042] A clean water tank, used to store clean water for spraying; the first cooling water pipe passes through the clean water tank, which is used to cool the first cooling water pipe;

[0043] A second cooling water pipe, connected to the first cooling water pipe, used to obtain the coolant of the first cooling water pipe after cooling down through the clean water tank, and arranged around the motor group to cool down the motor group;

[0044] The radiator assembly is arranged at the water outlet of the second cooling water pipe and is used for cooling the second cooling water pipe. The water outlet of the second cooling water pipe is connected to the expansion water tank and is used for recovering the coolant after cooling by the radiator assembly.

[0045] In this embodiment, the coolant first passes through the motor controller group through the first cooling water pipe, taking away the heat of the motor controller group. At this time, the temperature of the coolant in the first cooling water pipe has risen. At this time, continuing to use the coolant in the first cooling water pipe for the subsequent heat dissipation of the motor group cannot achieve the previous cooling effect. Therefore, after passing through the motor controller group, the first cooling water pipe is placed in the clean water tank for cooling. When the coolant flows through the first cooling water pipe in the clean water tank, the heat absorbed in the motor control group of the electric drive system is released into the clean water in the clean water tank, so as to achieve the purpose of cooling the coolant. The clean water tank is a conventional configuration of sanitation vehicles and does not need to be added separately. At the same time, the clean water in the clean water tank absorbs the temperature of the cold cutting liquid in the clean water tank and then sprays it on the road surface. The clean water in the clean water tank not only has the function of cleaning, but also has the function of cooling, which improves the utilization rate of clean water. At the same time, because the clean water in the clean water tank cools the temperature of the coolant in the cooling water pipe and flows into the second cooling water pipe, it has a better heat conduction effect, which can better and faster reduce the temperature of the rear motor group of the electric drive system.

[0046] The coolant flowing out of the clean water tank cools down the motor unit through the second cooling water pipe. At this time, the temperature of the coolant in the second cooling water pipe has increased. If the expansion water tank is directly recovered, the temperature of the coolant inside the water tank will increase. The coolant needs to be cooled before entering the expansion water tank. Therefore, a radiator assembly is set at this position to cool down through air conduction to ensure that the coolant entering the expansion water tank has been cooled, thereby realizing multi-stage cooling.

[0047] Further, if Figure 3 As shown, the top sides of the clean water tank 1 are respectively provided with an inlet hole 2 and an outlet hole 3 for the first cooling water pipe 4 to pass through and pass through. The first cooling water pipe 4 is spiral in the clean water tank. Rubber rings are respectively provided inside the inlet hole 2 and the outlet hole 3 to prevent the first cooling water pipe 4 from being worn.

[0048] In this embodiment, if Figure 3 As shown, in order to improve the cooling effect of the cooling water pipe in the clean water tank, the cooling water pipe in the clean water tank adopts a spirally curved pipe to reduce the flow resistance of the coolant. At the same time, a ring or spiral layout is adopted and evenly arranged at the bottom of the clean water tank to increase the contact surface area between the cooling water pipe and the clean water in the clean water tank, and improve the heat dissipation effect of the clean water on the cooling water pipe. The inlet hole for the cooling water pipe to enter the clean water tank and the outlet hole for passing through the clean water tank are set at the top of the clean water tank body, and rubber rings are installed at the inlet hole and the outlet hole to prevent the cooling water pipe from wearing against the hole wall of the inlet hole and the hole wall of the outlet hole.

[0049] Furthermore, the radiator assembly comprises:

[0050] A radiator, wherein the second cooling water pipe passes through the radiator and is used for cooling the second cooling water pipe;

[0051] A cooling fan is arranged at the air inlet of the radiator to assist in cooling the second cooling water pipe.

[0052] Further, if Figure 4 As shown, the cooling fan is connected to the vehicle-mounted controller for controlling the opening and closing and the speed of the cooling fan according to the temperature.

[0053] Further, if Figure 4 As shown, the vehicle-mounted controller is connected to a coolant temperature sensor, and the coolant temperature sensor is arranged on the second cooling water pipe to obtain the temperature of the second cooling water pipe.

[0054] Further, if Figure 4 As shown, the vehicle-mounted controller is connected to a motor temperature sensor group, and the motor temperature sensor group is arranged on the motor group to obtain the temperature of the motor group.

[0055] Further, if Figure 4 As shown, the vehicle-mounted controller is connected to a motor controller temperature sensor group, and the motor controller temperature sensor group is arranged on the motor controller group to obtain the temperature of the motor controller group.

[0056] In this embodiment, in order to better reduce the energy consumption of pure electric sanitation vehicles and improve the endurance of pure electric sanitation vehicles. Figure 4 As shown, in this embodiment, the vehicle controller starts the cooling fan based on the temperatures collected by the coolant temperature sensor, the motor temperature sensor group, and the motor controller temperature sensor group. Only when the temperatures collected by the coolant temperature sensor, the motor temperature sensor group, and the motor controller temperature sensor group exceed a certain temperature threshold.

[0057] This embodiment is described in conjunction with a specific workflow:

[0058] When the electric drive system is started, the on-board controller controls the cooling water pump to run at high speed to meet the performance requirements of the flow rate and lift of the cooling system of the pure electric sanitation vehicle. When the on-board controller detects that the temperature of the coolant temperature sensor is ≥50℃, the temperature of the motor temperature sensor group is ≥60℃, and the temperature of the motor controller temperature sensor group is ≥50℃, the on-board controller controls the cooling fan in the radiator assembly to start, and the cooling fan runs at 50% speed; when the on-board controller detects that the temperature of the coolant temperature sensor is ≥60℃, the temperature of the motor temperature sensor group is ≥60℃, and the temperature of the motor controller temperature sensor group is ≥60℃, the cooling fan runs at 100% speed;

[0059] When the vehicle controller input interface detects that the temperature of the coolant temperature sensor is less than 50°C, the temperature of the motor temperature sensor group is less than 60°C, and the temperature of the motor controller temperature sensor group is less than 50°C, the vehicle controller controls the cooling fan in the radiator assembly to turn off.

[0060] When the electric drive system is turned off, the on-board controller controls the cooling fan in the radiator assembly to turn off. At the same time, the on-board controller controls the cooling water pump to stop running.

[0061] This can effectively reduce the energy consumption of the cooling system. The cooling fan will only be started to accelerate heat dissipation when the temperature is high, thereby saving energy and improving the endurance of the pure electric sanitation vehicle.

[0062] It should be noted that the control program used in the vehicle-mounted controller in this embodiment is the prior art, and the present utility model does not involve improvements to the control program.

[0063] An embodiment of the present application also provides a pure electric sanitation vehicle, including the multi-stage cooling system for the electric drive system described in the above embodiment.

[0064] The above descriptions are only some embodiments of the present invention, and do not limit the protection scope of the present invention. Any equivalent device or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A multi-stage cooling system for an electric drive system, characterized in that: An electric drive system for a pure electric sanitation vehicle, the electric drive system comprising: an on-board controller, a motor controller group, and a motor group electrically connected in sequence, and used for electrically driving various mechanisms of the pure electric sanitation vehicle; The cooling system comprises: Expansion tank for storing and recovering coolant; a cooling water pump connected to the expansion water tank and used to pressurize the coolant so that the coolant flows; A first cooling water pipe, connected to the cooling water pump, disposed around the motor controller group, and used for cooling the motor controller group; A clean water tank, used to store clean water for spraying; the first cooling water pipe passes through the clean water tank, which is used to cool the first cooling water pipe; A second cooling water pipe, connected to the first cooling water pipe, used to obtain the coolant of the first cooling water pipe after cooling down through the clean water tank, and arranged around the motor group to cool down the motor group; The radiator assembly is arranged at the water outlet of the second cooling water pipe and is used for cooling the second cooling water pipe. The water outlet of the second cooling water pipe is connected to the expansion water tank and is used for recovering the coolant after cooling by the radiator assembly.

2. A multi-stage cooling system for an electric drive system according to claim 1, characterized in that: An inlet hole and an outlet hole are respectively arranged on both sides of the top of the clean water tank for the first cooling water pipe to pass in and out.

3. A multi-stage cooling system for an electric drive system according to claim 2, characterized in that: The first cooling water pipe is spirally shaped in the clean water tank.

4. A multi-stage cooling system for an electric drive system according to claim 2, characterized in that: Rubber rings are respectively arranged inside the inlet hole and the outlet hole to prevent the first cooling water pipe from being worn.

5. The multi-stage cooling system for an electric drive system according to claim 1, characterized in that: The radiator assembly comprises: A radiator, wherein the second cooling water pipe passes through the radiator and is used for cooling the second cooling water pipe; A cooling fan is arranged at the air inlet of the radiator to assist in cooling the second cooling water pipe.

6. A multi-stage cooling system for an electric drive system according to claim 5, characterized in that: The cooling fan is connected to the vehicle-mounted controller and is used to control the opening and closing and the speed of the cooling fan according to the temperature.

7. A multi-stage cooling system for an electric drive system according to claim 6, characterized in that: The vehicle-mounted controller is connected to a coolant temperature sensor, and the coolant temperature sensor is arranged on the second cooling water pipe to obtain the temperature of the second cooling water pipe.

8. The multi-stage cooling system for an electric drive system according to claim 6, characterized in that: The vehicle-mounted controller is connected to a motor temperature sensor group, and the motor temperature sensor group is arranged on the motor group to obtain the temperature of the motor group.

9. The multi-stage cooling system for an electric drive system according to claim 6, characterized in that: The vehicle-mounted controller is connected to a motor controller temperature sensor group, and the motor controller temperature sensor group is arranged on the motor controller group and is used to obtain the temperature of the motor controller group.

10. A pure electric sanitation vehicle, characterized in that: Comprising a multi-stage cooling system for an electric drive system as described in any one of claims 1-9.

Images