Discharge liquid circulation system, electric-drive power assembly and automobile

Abstract

To provide a discharge liquid circulation system whose structure is compact, which is light-weight, low in cost, is appropriate for a low position arranging system of an oil cooling motor, and is capable of expanding directionality of the oil cooling motor arrangement.SOLUTION: A discharge liquid circulation system 100 has a first liquid collection tank 111, a second liquid collection tank 112, an electromagnetic direction change-over valve 120 and an electrical pump 130, the first liquid collection tank and the second liquid collection tank communicating with each other and the second liquid collection tank being provided with a first liquid level 161 and a second liquid level 162. The electromagnetic direction change-over valve has a first liquid inlet 121 and a second liquid inlet 122. The first liquid inlet and the second liquid inlet of the electromagnetic direction change-over valve enter into the first liquid collection tank and the second liquid collection tank via two pipes. The liquid inlet of the electrical pump and a liquid outlet of the electromagnetic direction change-over valve are connected via a first pipe; a liquid outlet of the electrical pump is connected to corresponding spray nozzles 151, 152 via the second pipes.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to the technical field of automotive power, and more particularly to an exhaust circulation system, an electric drive assembly, and a vehicle. [Background technology]

[0002] In the automotive powertrain, the motor in the electric drive system uses oil injection for cooling and lubrication. If the horizontal positions of the motor and the transmission are not aligned, two separate oil supply systems are required for the motor and the transmission. The use of two separate oil supply systems occupies a large space, is heavy, and is costly. Therefore, a wastewater circulation system is urgently needed to solve the above problem.

[0003] It should be noted that the statements herein are merely intended to provide background information related to the present disclosure and may not necessarily constitute prior art. Summary of the Invention

[0004] In view of the above problems, the present disclosure proposes an effluent circulation system, an electric drive assembly and a motor vehicle that eliminate or at least partially solve the above problems.

[0005] The embodiments of the present disclosure employ the following technical solutions.

[0006] In a first aspect, an embodiment of the present disclosure provides a waste liquid circulation system, the waste liquid circulation system including a first collection tank, a second collection tank, an electromagnetic directional control valve, and an electric pump, the first collection tank and the second collection tank being in communication with each other, the second collection tank being provided with a first liquid level sensor and a second liquid level sensor, the first liquid level sensor and the second liquid level sensor respectively acquiring the liquid level of the second collection tank, the electromagnetic directional control valve having a first liquid inlet and a second liquid inlet, the first liquid inlet and the second liquid inlet of the electromagnetic directional control valve respectively flowing into the first collection tank and the second collection tank via two pipes, the liquid inlet of the electric pump and the liquid outlet of the electromagnetic directional control valve being connected via a first pipe, and the liquid outlet of the electric pump being connected to a corresponding spray nozzle via a second pipe.

[0007] Preferably, a return passage is provided between the first collection tank and the second collection tank, and the liquid level of the cooling liquid in the first collection tank is flush with the return passage and the liquid level of the cooling liquid in the second collection tank is lower than the return passage, or the liquid level of the cooling liquid in the second collection tank is flush with the return passage and the liquid level of the cooling liquid in the first collection tank is lower than the return passage.

[0008] Preferably, the first collection tank and the second collection tank have a common side surface, and the return passage is provided on the common side surface, or the internal space of the first collection tank and the internal space of the second collection tank are connected to each other, and a cavity wall that is flush with the liquid level of the cooling liquid in the first collection tank is provided between the internal spaces.

[0009] Preferably, the first liquid level sensor is provided on a front side surface of the second liquid collecting tank, and the second liquid level sensor is provided on a rear side surface of the second liquid collecting tank.

[0010] Preferably, the waste liquid circulation system further includes a heat exchanger, the liquid inlet of the heat exchanger and the liquid outlet of the electric pump are connected via a third pipe, and the liquid outlet of the heat exchanger is connected to a corresponding spray nozzle via a fourth pipe.

[0011] Preferably, the electric pump and the electromagnetic directional control valve are integrally formed, and cooling fluid passages are provided inside the electric pump and the electromagnetic directional control valve.

[0012] Preferably, the waste liquid circulation system further includes a controller, which is connected to the first liquid level sensor, the second liquid level sensor, the electromagnetic directional control valve, and the electric pump.

[0013] In a second aspect, embodiments of the present disclosure further provide an electric driving force assembly having any one of the waste fluid circulation systems described in the first aspect.

[0014] In a third aspect, embodiments of the present disclosure further provide a motor vehicle having an electric drive force assembly according to the second aspect. [Effects of the Invention]

[0015] The at least one technical solution adopted in the embodiments of the present disclosure can achieve the following beneficial effects:

[0016] The drainage circulation system disclosed herein automatically monitors the coolant level in the collection tank and automatically switches between suction tanks, thereby monitoring the liquid level in the collection tank and automatically draining and refilling the coolant, thereby satisfying the need for liquid level control in the collection tank. Furthermore, the drainage circulation system has a compact structure, is light in weight, and is inexpensive, making it suitable for low-position installation systems for oil-cooled motors, thereby expanding the installation options for oil-cooled motors. The above description of the technical solution of the present disclosure is merely a summary of the technical solution of the present disclosure, which can be implemented according to the contents of the specification, so as to make the technical means of the present disclosure more clearly known, and to make the above and other objectives, features and advantages of the present disclosure more clearly and easily understood, specific embodiments of the present disclosure are given below.

[0017] Various other benefits and advantages will become apparent to those skilled in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the disclosure. Furthermore, like reference numerals refer to like parts throughout the drawings. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a first schematic diagram of a waste fluid circulation system according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a second schematic diagram of a waste fluid circulation system according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0019] In order to make the objectives, technical solutions and advantages of the present disclosure more apparent, the technical solutions of the present disclosure will be clearly and completely described below in conjunction with specific embodiments of the present disclosure and corresponding drawings. Obviously, the described embodiments are only some embodiments of the present disclosure, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present disclosure without paying creative labor fall within the protection scope of the present disclosure.

[0020] The concept of the present disclosure is to design an automated and highly versatile drainage circulation system in response to the current situation in which, in the prior art, two sets of separate oil supply systems are required for the motor and transmission when the horizontal positions of the motor and transmission do not match. This system automatically switches the liquid suction passage by triggering and controlling the electromagnetic directional control valve using a liquid level sensor signal, thereby realizing liquid suction switching between different liquid collection tanks, and thereby adjusting and controlling the liquid levels in the different liquid collection tanks.

[0021] Hereinafter, technical solutions according to the embodiments of the present disclosure will be described in detail with reference to the drawings.

[0022] An embodiment of the present disclosure provides a wastewater circulation system, an electric drive assembly, and a vehicle. As shown in FIG. 1 , which is a first schematic diagram of a wastewater circulation system according to an embodiment of the present disclosure, the wastewater circulation system 100 includes a first collection tank 111, a second collection tank 112, an electromagnetic directional control valve 120, and an electric pump 130. The first collection tank 111 and the second collection tank 112 are connected via a return passage 171. The second collection tank 112 is provided with a first liquid level sensor 161 and a second liquid level sensor 162, which are used to acquire the liquid level (liquid level) of the second collection tank, respectively. The liquid inlets of the electromagnetic directional control valve 120 enter the coolant in the first collection tank 111 and the second collection tank 112 via two pipes. The liquid inlet of the electric pump 130 and the liquid outlet of the electromagnetic directional control valve 120 are connected via one pipe, and the liquid outlet of the electric pump 130 is connected to a corresponding spray nozzle via a second pipe. The spray nozzle has a first spray nozzle and a second spray nozzle, and the first spray nozzle is used to cool the transmission by injecting oil, and the second spray nozzle is used to cool the motor by injecting oil. In the present disclosure, the pipes connected to the electromagnetic directional control valve, the electric pump, and the inside of the collection tank include oil pipes, holes, etc. so that the coolant flows along a predetermined path.

[0023] As shown in FIG. 1, in the present disclosure, the first collection tank 111 is provided in the transmission and is for collecting the coolant flowing in from the transmission side, and the second collection tank 112 is applied to the motor and is for collecting the coolant flowing in from the motor side.

[0024] When the waste liquid circulation system is activated, the system determines the liquid level in the second collection tank 112 via the first liquid level sensor 161 and the second liquid level sensor 162. The first liquid level sensor 161 and the second liquid level sensor 162 provide real-time feedback of the liquid level information. When both the first liquid level sensor 161 and the second liquid level sensor 162 detect that the liquid level in the second collection tank 112 is low, the controller (not shown) controls the electromagnetic directional control valve 120 so that the coolant flows from the first collection tank 111 into the first liquid inlet 121 of the electromagnetic directional control valve 120. That is, at this time, the electric pump 130 draws the coolant from the first collection tank 111, and after passing through the electric pump, the first spray nozzle, and the second spray nozzle, the coolant sprays oil onto the transmission and the motor, respectively, to cool them.

[0025] When only one of the first liquid level sensor 161 and the second liquid level sensor 162 detects that the liquid level in the second collection tank 112 is low, a controller (not shown) controls the electromagnetic directional control valve 120 so that the coolant flows from the second collection tank 112 into the second liquid inlet 122 of the electromagnetic directional control valve 120. That is, at this time, the electric pump 130 sucks liquid from the second collection tank 112, thereby lowering the liquid level in the second collection tank 112 and preventing the liquid level in the second collection tank from exceeding the air gap position of the motor. After passing through the electric pump, the first spray nozzle, and the second spray nozzle, the coolant sprays oil onto the transmission and the motor, respectively, to cool them.

[0026] In the present disclosure, a return passage 171 is provided between the first collection tank 111 and the second collection tank 112, and the liquid level of the coolant in the first collection tank is flush with the return passage 171, and the liquid level of the coolant in the second collection tank is lower than the return passage 171. Alternatively, the liquid level of the coolant in the second collection tank is flush with the return passage 171, and the liquid level of the coolant in the first collection tank is lower than the return passage 171.

[0027] 1 and 2, the first collection tank 111 and the second collection tank 112 have coolant at different heights, with the height of the coolant in the first collection tank 111 being the same as the height of the return passage 171, and the height of the coolant in the second collection tank 112 being less than the height of the return passage 171. This configuration ensures that the coolant in the first collection tank 111 and the second collection tank 112 are at different heights, thereby solving the problem of the coolant level exceeding the motor air gap position when the motor and transmission are installed at different heights and angles due to the use of collection tanks with the same liquid level.

[0028] As can be seen, the first collection tank 111 and the second collection tank 112 respectively cool the transmission and the motor by oil injection, and in specific implementation, the installation positions of the first collection tank 111 and the second collection tank 112 vary depending on the installation positions of the transmission and the motor. In the present disclosure, the installation positions of the first collection tank 111 and the second collection tank 112 correspond to the height of the coolant level in the first collection tank and the second collection tank.

[0029] In some embodiments of the present disclosure, the first collection tank 111 and the second collection tank 112 have a common side surface, and the return passage is provided on the common side surface, or the internal space of the first collection tank 111 and the internal space of the second collection tank 112 are connected, and a cavity wall 113 is provided between the internal spaces, which is flush with the liquid level of the cooling liquid in the first collection tank.

[0030] As shown in FIG. 2 , in a specific implementation, the present disclosure can achieve communication between the first collection tank 111 and the second collection tank 112 in two ways. In the first way, the first collection tank 111 and the second collection tank 112 have a common side surface (cavity wall 113), which seals both the first collection tank 111 and the second collection tank 112, and the return passage 171 is provided on the common side surface. In this case, the collection tank 110 is divided by the cavity wall 113 into two collection tanks (the first collection tank 111 and the second collection tank 112) that can store liquid at different liquid levels, and the return passage 171 is provided on the cavity wall 113. The return passage is flush with the liquid level of the coolant that is previously stored in the first collection tank 111. The liquid level of the coolant stored in advance in the second liquid collection tank 112 is lower than the liquid level of the coolant stored in advance in the first liquid collection tank 111.

[0031] In the second type, the first collection tank 111 and the second collection tank 112 also have a common side surface (cavity wall 113). In this case, the cavity wall 113 is the lower half of the entire side surface, and the first collection tank 111 and the second collection tank 112 are not sealed by the cavity wall. That is, the internal space of the first collection tank 111 and the internal space of the second collection tank 112 are connected, and the cavity wall 113, which is flush with the liquid level of the coolant in the first collection tank, is provided between the internal spaces. In this case, a return passage is not required, and the coolant can simply overflow from the cavity wall 113. In this case, the collection tank 110 is divided by the cavity wall 113 into two collection tanks (the first collection tank 111 and the second collection tank 112) that can store liquid at different liquid levels. The cavity wall is flush with the liquid level of the coolant stored in advance in the first liquid collection tank 111, and the liquid level of the coolant stored in advance in the second liquid collection tank 112 is lower than the liquid level of the coolant stored in advance in the first liquid collection tank 111.

[0032] In some embodiments of the present disclosure, the waste liquid circulation system further comprises a heat exchanger 140, the liquid inlet of the heat exchanger 140 and the liquid outlet of the electric pump 130 are connected via a third pipe, and the liquid outlet of the heat exchanger 140 is connected to a corresponding spray nozzle via a fourth pipe.

[0033] 2, in a specific implementation, the first liquid inlet 121 of the electromagnetic directional control valve 120 is connected to the first collection tank 111, the second liquid inlet 122 of the electromagnetic directional control valve 120 is connected to the second collection tank 112, the liquid outlet of the electromagnetic directional control valve 120 is connected to the liquid inlet of the electric pump 130, the liquid outlet of the electric pump 130 is connected to the liquid inlet of the heat exchanger 140 via a pipe, and the liquid outlets of the heat exchanger 140 are connected to the first spray nozzle 151 and the second spray nozzle 152 via a pipe, respectively, so that the distributed liquid flows to the location requiring cooling. The sprayed cooling liquid returns to the first collection tank 111 or the second collection tank 112 by gravity.

[0034] In some embodiments of the present disclosure, the first liquid level sensor 161 is provided on the front side of the second collection tank 112 , and the second liquid level sensor 162 is provided on the rear side of the second collection tank 112 .

[0035] In a specific implementation, as shown in Figure 2, a first liquid level sensor 161 and a second liquid level sensor 162 are provided at a midpoint between the front and rear sides of the second liquid collection tank 112 where liquid level control is required, to monitor the liquid level in the second liquid collection tank 112 in real time and prevent the liquid level from exceeding the air gap position of the motor due to the liquid level in the second liquid collection tank 112 exceeding the warning level during cooling by oil injection.

[0036] In some embodiments of the present disclosure, the waste liquid circulation system 100 further includes a controller (not shown), which is connected to the first liquid level sensor 161, the second liquid level sensor 162, the electromagnetic directional control valve 120, and the electric pump 130, respectively, and is used to trigger different operating states of the electromagnetic directional control valve 120 and the electric pump 130 based on feedback signals from the liquid level sensors.

[0037] In the present disclosure, the control cables of the electromagnetic directional control valve 120, the electric pump 130, the first liquid level sensor 161 and the second liquid level sensor 162 are connected to a controller, and cooling by oil injection is automatically performed according to a preset program.

[0038] In specific implementation, the waste liquid circulation system is applied to an automobile, and since the automobile encounters different road conditions while traveling, the collection tank 110 (first collection tank 111 and second collection tank 112) in the present disclosure will be inclined in different directions.

[0039] When the collection tank 110 tilts to the right, gravity causes the coolant to flow freely in the first collection tank 111 and the second collection tank 112. At this time, the liquid level in the second collection tank 112 fluctuates. To prevent the liquid level in the second collection tank 112 from rising and exceeding the air gap position of the motor, if only one of the first liquid level sensor 161 and the second liquid level sensor 162 provided in the second collection tank 112 detects that the liquid level in the second collection tank 112 is lower than a preset liquid level (the low liquid level detection point of the two liquid level sensors), the controller controls and operates the electromagnetic directional control valve to connect the liquid inlet of the electric pump to the second collection tank 112, and the coolant is sucked from the second collection tank 112. The coolant is then sprayed from the first spray nozzle 151 and the second spray nozzle 152 via piping. The coolant that has returned to the first collection tank 111 is automatically returned to the second collection tank 112 via the return passage 171, and a balance is formed between the discharge and inflow into the second collection tank 112.

[0040] By the same principle, when the collection tank 110 is tilted forward or backward, the action of gravity causes the coolant to flow freely within the first collection tank 111 and the second collection tank 112. At this time, the liquid level in the second collection tank 112 fluctuates, and the liquid levels detected by the first liquid level sensor 161 and the second liquid level sensor 162 differ. As long as only one of the first liquid level sensor 161 and the second liquid level sensor 162 detects that the liquid level in the second collection tank 112 is lower than a preset liquid level (the low liquid level detection point of the two liquid level sensors), the controller controls the electromagnetic directional control valve to connect the liquid inlet of the electric pump 130 to the second collection tank 112, and the coolant is sucked from the second collection tank 112.

[0041] When the collection tank 110 tilts to the left, gravity causes the coolant to flow freely in the first collection tank 111 and the second collection tank 112. At this time, the liquid level in the second collection tank 112 fluctuates. If the degree of leftward tilt is large, the first liquid level sensor 161 and the second liquid level sensor 162 simultaneously detect that the liquid level in the second collection tank 112 is lower than a preset liquid level (the low liquid level detection points of the two liquid level sensors). At this time, the controller controls and operates the electromagnetic directional control valve 120 to connect the liquid inlet of the electric pump to the first collection tank 111, and the coolant is sucked from the first collection tank 111 and sprayed through the spray nozzle. The coolant that returns to the second collection tank 112 is automatically returned to the first collection tank 111 via the return passage 171, ensuring that the liquid level in the second collection tank 112 does not exceed the high liquid level detection point of the liquid level sensor. This ensures the normal operation of the motor. As can be understood, the controller of the present disclosure controls and operates the electromagnetic directional control valve according to the signal of the liquid level sensor, automatically switches the passage, and realizes the switching of the suction tank of the electric pump, thereby adjusting and controlling the liquid level in the collecting tank.

[0042] In some embodiments of the present disclosure, the electric pump and the electromagnetic directional control valve are integrally formed, and coolant passages are provided inside the electric pump and the electromagnetic directional control valve.

[0043] In the present disclosure, the electric pump and the electromagnetic directional control valve may be mounted as separate components at a mounting position on the wall of the collecting tank, or the electric pump and the electromagnetic directional control valve may be integrated and then mounted at a mounting position on the wall of the collecting tank, in which case the drainage system has the advantages of simple structure, small space, and high integration.

[0044] It can be understood that the orientation descriptions in this disclosure are in accordance with the orientations shown in Figures 1 and 2. In actual implementation, the drainage circulation system is installed at a predetermined position on the automobile, so that different installation positions will cause the described orientations to vary, but this should not be excluded from the scope of protection of the technical solution of this disclosure.

[0045] The present disclosure also provides an electric driving force assembly having the above-described drainage circulation system. Other parts of the electric driving force assembly can be referred to in the prior art, and will not be repeated in this disclosure.

[0046] As can be understood, the electric driving force assembly of the present disclosure can automatically monitor the liquid level and automatically switch the liquid suction tank, so that the liquid level of the second liquid collection tank that requires liquid level control is monitored and the coolant is automatically drained and replenished, thereby satisfying the demand for liquid level control in the liquid collection tank. Furthermore, the specific structure of the discharged liquid circulation system of the present disclosure makes it compact in structure, light in weight, and low in cost, and is suitable for a low-position arrangement system for an oil-cooled motor, expanding the directions for the arrangement of the oil-cooled motor.

[0047] The present disclosure also provides a vehicle having the electric drive assembly as described above. For other parts of the vehicle, reference can be made to the prior art, which will not be repeated in this disclosure.

[0048] It should be noted that in the description of this disclosure, terms such as "first," "second," etc. are used for descriptive purposes only and do not denote or imply any relative importance. Also, in the description of this disclosure, unless otherwise specified, "plurality" means two or more.

[0049] In this disclosure, unless otherwise expressly specified or limited, terms such as "attach," "couple," "connect," and "fixed" should be understood in a broad sense. For example, they may be fixedly connected, detachably connected, or integrated. They may also be mechanically connected, electrically connected, or capable of communicating with each other. Furthermore, unless otherwise expressly limited, they may be directly connected, indirectly connected via an intermediate medium, or may refer to internal communication between two elements or an interactive relationship between two elements. Those skilled in the art will be able to understand the specific meanings of the above terms in this disclosure depending on the specific circumstances.

[0050] In this disclosure, unless expressly specified or limited otherwise, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature indicates that the first feature is directly above or diagonally above the second feature, or simply that the horizontal height of the first feature is higher than that of the second feature. A first feature being "below," "below," and "below" a second feature indicates that the first feature is directly below or diagonally below the second feature, or simply that the horizontal height of the first feature is lower than that of the second feature.

[0051] Any procedure or method description illustrated in a flowchart or other manner can be understood as one or more modules, segments, or portions having executable instruction codes for implementing specific logical functions or procedure steps, and it should be understood by those skilled in the art that the scope of the preferred embodiments of the present invention includes alternative implementations, including performing functions essentially simultaneously or in reverse order based on such functions instead of following the order shown or described.

[0052] In the description herein, references such as "one embodiment," "some embodiments," "example," "specific example," or "one example" mean that the specific feature, structure, material, or characteristic described with reference to that embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, general references to the above terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

[0053] Although the embodiments of the present disclosure have been shown and described above, it should be understood that the above embodiments are merely illustrative and should not be construed as limiting the present disclosure, and those skilled in the art may make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present disclosure. [Explanation of symbols]

[0054] 100 drainage circulation system, 110 collection tank, 111 first collection tank, 112 second collection tank, 113 cavity wall, 120 electromagnetic directional control valve, 121 first liquid inlet, 122 second liquid inlet, 130 electric pump, 140 heat exchanger, 151 first spray nozzle, 152 second spray nozzle, 161 first liquid level sensor, 162 second liquid level sensor, 171 return passage.

Claims

1. A waste liquid circulation system, comprising: a first collection tank, a second collection tank, an electromagnetic directional control valve, and an electric pump; the first collection tank and the second collection tank are in communication with each other, the second collection tank is provided with a first liquid level sensor and a second liquid level sensor, and the first liquid level sensor and the second liquid level sensor respectively acquire the liquid level of the second collection tank; the electromagnetic directional control valve has a first liquid inlet and a second liquid inlet, the first liquid inlet and the second liquid inlet of the electromagnetic directional control valve respectively leading to the first liquid collection tank and the second liquid collection tank; a liquid inlet of the electric pump and a liquid outlet of the electromagnetic directional control valve are connected via a first pipe, and a liquid outlet of the electric pump is connected to a corresponding spray nozzle via a second pipe; A waste liquid circulation system characterized by:

2. a return passage is provided between the first collection tank and the second collection tank; The liquid level of the cooling liquid in the first liquid collection tank is flush with the return passage, and the liquid level of the cooling liquid in the second liquid collection tank is lower than the return passage, or Alternatively, the liquid level of the cooling liquid in the second liquid collection tank is flush with the return passage, and the liquid level of the cooling liquid in the first liquid collection tank is lower than the return passage.

2. The waste liquid circulation system according to claim 1.

3. the first collecting tank and the second collecting tank have a common side surface, and the return passage is provided in the common side surface.

3. The waste liquid circulation system according to claim 2.

4. an internal space of the first liquid collecting tank and an internal space of the second liquid collecting tank communicate with each other, and a cavity wall that is flush with the liquid level of the cooling liquid in the first liquid collecting tank is provided between the internal spaces.

2. The waste liquid circulation system according to claim 1.

5. the first liquid level sensor is provided on a front side surface of the second collecting tank, and the second liquid level sensor is provided on a rear side surface of the second collecting tank; 3. The waste liquid circulation system according to claim 2.

6. The system further includes a heat exchanger, wherein a liquid inlet of the heat exchanger is connected to a liquid outlet of the electric pump via a third pipe, and a liquid outlet of the heat exchanger is connected to a corresponding spray nozzle via a fourth pipe.

3. The waste liquid circulation system according to claim 2.

7. the electric pump and the electromagnetic directional control valve are integrally molded, and a coolant passage is provided inside the electric pump and the electromagnetic directional control valve.

3. The waste liquid circulation system according to claim 2.

8. The system further includes a controller connected to the first liquid level sensor, the second liquid level sensor, the electromagnetic directional control valve, and the electric pump.

3. The waste liquid circulation system according to claim 2.

9. A waste liquid circulation system according to any one of claims 1 to 8, 1. An electric drive assembly comprising:

10. 10. An electric drive assembly according to claim 9. A vehicle characterized by:

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