Liquid drainage circulating system, electric driving force assembly and automobile

Abstract

The utility model discloses a liquid drainage circulation system, an electric driving force assembly and an automobile. The liquid discharge circulating system comprises a first liquid collection pool and a second liquid collection pool, the first liquid collection pool and the second liquid collection pool are communicated with each other, and a first liquid level sensor and a second liquid level sensor are arranged in the second liquid collection pool; the electromagnetic directional valve comprises a first liquid inlet and a second liquid inlet, and the first liquid inlet and the second liquid inlet of the electromagnetic directional valve respectively extend into the first liquid collecting pool and the second liquid collecting pool through two pipelines; a liquid inlet of the electric pump is connected with a liquid outlet of the electromagnetic reversing valve through a first pipeline, and a liquid outlet of the electric pump is connected to the corresponding liquid spraying opening through a second pipeline. The liquid discharging circulation system controls the electromagnetic reversing valve through a liquid level sensor signal, channels of the electromagnetic reversing valve are automatically switched, liquid suction switching of different liquid collecting pools is achieved, and therefore the liquid levels of the different liquid collecting pools are adjusted and controlled.

Description

Technical Field

[0001] The present application relates to the field of automobile power technology, and in particular to a liquid discharge circulation system, an electric drive power assembly and an automobile. Background Art

[0002] In the field of automotive power, the electric drive system motor uses oil injection cooling and lubrication. When the horizontal positions of the motor and the transmission are inconsistent, the motor and the transmission require two separate oil supply systems. However, using two separate oil supply systems takes up a lot of space, is heavy, and has high costs. Based on this, a liquid discharge circulation system is urgently needed to solve the above problems.

[0003] It should be noted that the statements herein merely provide background information related to the present application and do not necessarily constitute prior art. Utility Model Content

[0004] In view of the above problems, the present application proposes a drainage circulation system, an electric drive power assembly and a vehicle that overcome the above problems or at least partially solve the above problems.

[0005] The present application embodiment adopts the following technical solutions:

[0006] In the first aspect, an embodiment of the present application provides a liquid drainage circulation system, comprising: a first liquid collecting tank and a second liquid collecting tank, the first liquid collecting tank and the second liquid collecting tank being connected to each other, a first liquid level sensor and a second liquid level sensor being provided in the second liquid collecting tank, the first liquid level sensor and the second liquid level sensor being used to respectively obtain the liquid level of the second liquid collecting tank; and an electromagnetic reversing valve, the electromagnetic reversing valve comprising a first liquid inlet and a second liquid inlet, the first liquid inlet and the second liquid inlet of the electromagnetic reversing valve respectively extending into the first liquid collecting tank and the second liquid collecting tank through two pipes; and an electric pump, the liquid inlet of the electric pump being connected to the liquid outlet of the electromagnetic reversing valve through a first pipe, and the liquid outlet of the electric pump being connected to the corresponding liquid spray port through a second pipe.

[0007] Preferably, a reflux channel is provided between the first liquid collecting pool and the second liquid collecting pool, the coolant level in the first liquid collecting pool is flush with the reflux channel, and the coolant level in the second liquid collecting pool is lower than the reflux channel. Alternatively, the coolant level in the second liquid collecting pool is flush with the reflux channel, and the coolant level in the first liquid collecting pool is lower than the reflux channel.

[0008] Preferably, the first liquid collecting pool and the second liquid collecting pool have a common side surface, and the reflux channel is arranged on the common side surface; or, the internal spaces of the first liquid collecting pool and the second liquid collecting pool are connected, and a cavity wall which is level with the liquid surface of the coolant in the first liquid collecting pool is arranged in the internal space.

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

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

[0011] Preferably, the electric pump and the electromagnetic reversing valve are integrally formed, and cooling liquid channels are provided inside the electric pump and the electromagnetic reversing valve.

[0012] Preferably, the drainage circulation system further includes a controller, and the controller is respectively connected to the first liquid level sensor, the second liquid level sensor, the electromagnetic reversing valve and the electric pump.

[0013] In a second aspect, an embodiment of the present application further provides an electric drive power assembly, comprising a liquid drainage circulation system as described in any one of the first aspects.

[0014] In a third aspect, an embodiment of the present application further provides a car, comprising the electric drive power assembly as described in the second aspect.

[0015] At least one of the above technical solutions adopted in the embodiments of the present application can achieve the following beneficial effects:

[0016] The drainage circulation system in the present application can automatically monitor the coolant level in the liquid collection tank and automatically switch the liquid suction tank, so that the liquid level of the liquid collection tank is monitored while the coolant is automatically discharged and replenished, meeting the needs of liquid level control in the liquid collection tank. In addition, the drainage circulation system has a compact structure, light weight and low cost, and is suitable for the low-position arrangement system of oil-cooled motors, broadening the direction of oil-cooled motor arrangement.

[0017] The above description of the technical solution of the present application is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0019] Figure 1 This is a first schematic diagram of the drainage circulation system in the embodiment of the present application;

[0020] Figure 2 This is a second schematic diagram of the drainage circulation system in an embodiment of the present application.

[0021] In the present application, 100-liquid discharge circulation system; 110-liquid collecting tank; 111-first liquid collecting tank; 112-second liquid collecting tank; 113-cavity wall; 120-electromagnetic reversing valve; 121-first liquid inlet; 122-second liquid inlet; 130-electric pump; 140-heat exchanger; 151-first liquid spray port; 152-second liquid spray port; 161-first liquid level sensor; 162-second liquid level sensor; 171-reflux channel. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0023] The idea of ​​the present application is to design an automated and universal liquid discharge circulation system in view of the current situation in the art where, when the horizontal positions of the motor and the transmission are inconsistent, the motor and the transmission require two separate oil supply systems. The system uses the liquid level sensor signal to trigger and control the electromagnetic reversing valve to automatically switch the liquid suction channel, thereby realizing the liquid suction conversion of different liquid collection pools, thereby adjusting and controlling the liquid levels of different liquid collection pools.

[0024] The technical solutions provided by various embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0025] The present application provides a liquid discharge circulation system, an electric drive power assembly and a vehicle. Figure 1As shown, a first schematic diagram of a drainage circulation system in an embodiment of the present application is provided, wherein the drainage circulation system 100 comprises a first liquid collecting tank 111 and a second liquid collecting tank 112, wherein the first liquid collecting tank 111 and the second liquid collecting tank 112 are connected via a reflux channel 171, and a first liquid level sensor 161 and a second liquid level sensor 162 are provided in the second liquid collecting tank 112, wherein the first liquid level sensor 161 and the second liquid level sensor 162 are used to obtain the liquid level height of the second liquid collecting tank respectively; and an electromagnetic reversing valve 120, The liquid inlet of the electromagnetic reversing valve 120 extends into the coolant in the first liquid collecting tank 111 and the second liquid collecting tank 112 through two pipes respectively; and the electric pump 130, the liquid inlet of the electric pump 130 is connected to the liquid outlet of the electromagnetic reversing valve 120 through a pipe, and the liquid outlet of the electric pump 130 is connected to the corresponding liquid spray port through a second pipe, and the liquid spray port includes a first liquid spray port and a second liquid spray port, the first liquid spray port is used for oil spray cooling of the transmission; the second liquid spray port is used for oil spray cooling of the motor. In the present application, the pipes connecting the electromagnetic reversing valve, the electric pump and the liquid collecting tank include oil pipes, channels, etc., so that the coolant flows along a preset path.

[0026] like Figure 1 As shown, in the present application, the first liquid collecting tank 111 is arranged in the transmission to collect the coolant flowing in from the transmission side; the second liquid collecting tank 112 is applied to the motor to collect the coolant flowing in from the motor side.

[0027] After the liquid discharge circulation system is started, the system determines the liquid level height of the second liquid collecting tank 112 through 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 liquid level information. When the first liquid level sensor 161 and the second liquid level sensor 162 both detect that the liquid level of the second liquid collecting tank 112 is at a low level, the controller (not shown) controls the electromagnetic reversing valve 120 so that the coolant enters the first liquid inlet 121 of the electromagnetic reversing valve 120 from the first liquid collecting tank 111, that is, at this time, the electric pump 130 draws liquid from the first liquid collecting tank 111, and the coolant passes through the electric pump, the first liquid injection port, and the second liquid injection port, and then performs oil spray cooling on the transmission and the motor respectively.

[0028] When the first liquid level sensor 161 and the second liquid level sensor 162 detect that the liquid level of the second liquid collecting tank 112 is not at a low level at the same time, the controller (not shown) controls the electromagnetic reversing valve 120 so that the coolant enters the second liquid inlet 122 of the electromagnetic reversing valve 120 from the second liquid collecting tank 112, that is, at this time, the electric pump 130 sucks liquid from the second liquid collecting tank 112, thereby lowering the liquid level of the second liquid collecting tank 112 to prevent the liquid surface in the second liquid collecting tank from flooding the air gap position of the motor. After the coolant passes through the electric pump, the first liquid spray port and the second liquid spray port, it is sprayed to cool the transmission and the motor respectively.

[0029] In the present application, a reflux channel 171 is provided between the first liquid collecting pool 111 and the second liquid collecting pool 112, the cooling liquid level in the first liquid collecting pool is flush with the reflux channel 171, and the cooling liquid level in the second liquid collecting pool is lower than the reflux channel 171. Alternatively, the cooling liquid level in the second liquid collecting pool is flush with the reflux channel 171, and the cooling liquid level in the first liquid collecting pool is lower than the reflux channel 171.

[0030] like Figure 1 and Figure 2 As shown, the first liquid collecting tank 111 and the second liquid collecting tank 112 contain coolant at different heights, wherein the coolant height of the first liquid collecting tank 111 is the same as the height of the interflow channel 171, and the coolant height of the second liquid collecting tank 112 is less than the height of the interflow channel 171. Such an arrangement can ensure that the coolant in the first liquid collecting tank 111 and the second liquid collecting tank 112 are at different heights, thereby solving the problem of the liquid surface submerging the air gap position of the motor when the motor and the transmission are arranged at different heights and angles and using liquid collecting tanks with the same liquid surface.

[0031] It can be understood that the first liquid collecting pool 111 and the second liquid collecting pool 112 respectively perform oil spray cooling on the transmission and the motor. In specific implementation, the first liquid collecting pool 111 and the second liquid collecting pool 112 are set at different positions according to the different placement positions of the transmission and the motor. In this application, the setting of the height of the coolant level in the first liquid collecting pool and the second liquid collecting pool corresponds to the height of the transmission and the motor.

[0032] In some examples of the present application, the first liquid collecting pool 111 and the second liquid collecting pool 112 have a common side surface, and the reflux channel is arranged on the common side surface; or, the internal spaces of the first liquid collecting pool 111 and the second liquid collecting pool 112 are connected, and a cavity wall 113 that is level with the coolant surface of the first liquid collecting pool is arranged in the internal space.

[0033] like Figure 2 As shown, in the specific implementation of the present application, the connection between the first liquid collecting tank 111 and the second liquid collecting tank 112 can be achieved in two ways. In the first way, the first liquid collecting tank 111 and the second liquid collecting tank 112 have a common side (cavity wall 113), and the common side simultaneously closes the first liquid collecting tank 111 and the second liquid collecting tank 112, and the reflux channel 171 is arranged on the common side. At this time, the liquid collecting tank 110 is separated by the cavity wall 113 into two liquid collecting tanks (the first liquid collecting tank 111 and the second liquid collecting tank 112) that can store liquids at different heights, and the reflux channel 171 is arranged on the cavity wall 113. The reflux channel is flush with the cooling liquid level pre-stored in the first liquid collecting tank 111, and the cooling liquid level pre-stored in the second liquid collecting tank 112 is lower than the cooling liquid level pre-stored in the first liquid collecting tank 111.

[0034] In the second method, the first liquid collecting tank 111 and the second liquid collecting tank 112 also have a common side (cavity wall 113). In this case, the cavity wall 113 is the lower half of the entire side, and the cavity wall does not close the first liquid collecting tank 111 and the second liquid collecting tank 112, that is, the internal spaces of the first liquid collecting tank 111 and the second liquid collecting tank 112 are connected, and a cavity wall 113 that is flush with the coolant level of the first liquid collecting tank is set in the internal space. In this scenario, a reflux channel may not be set, and the coolant can overflow from the cavity wall 113. At this time, the liquid collecting tank 110 is separated by the cavity wall 113 into two liquid collecting tanks (the first liquid collecting tank 111 and the second liquid collecting tank 112) that can store liquids at different heights. The cavity wall is flush with the cooling liquid level pre-stored in the first liquid collecting tank 111, and the cooling liquid level pre-stored in the second liquid collecting tank 112 is lower than the cooling liquid level pre-stored in the first liquid collecting tank 111.

[0035] In some examples of the present application, the drainage circulation system also includes a heat exchanger 140, the liquid inlet of the heat exchanger 140 is connected to the liquid outlet of the electric pump 130 through a third pipe, and the liquid outlet of the heat exchanger 140 is connected to the corresponding liquid injection port through a fourth pipe.

[0036] like Figure 2 As shown, in a specific implementation, the first liquid inlet 121 of the electromagnetic reversing valve 120 is communicated with the first liquid collecting tank 111, the second liquid inlet 122 of the electromagnetic reversing valve 120 is communicated with the second liquid collecting tank 112, and the liquid outlet of the electromagnetic reversing valve 120 is communicated with the liquid inlet of the electric pump 130; the liquid outlet of the electric pump 130 is communicated with the liquid inlet of the heat exchanger 140 through a pipeline, and the liquid outlet of the heat exchanger 140 is communicated with the first liquid spraying port 151 and the second liquid spraying port 152 through a pipeline, respectively, to distribute the liquid flow to the position that needs cooling. The sprayed coolant flows back to the first liquid collecting tank 111 or the second liquid collecting tank 112 under the action of gravity.

[0037] In some examples of the present application, the first liquid level sensor 161 is disposed on the front side of the second liquid collecting tank 112 , and the second liquid level sensor 162 is disposed on the rear side of the second liquid collecting tank 112 .

[0038] When implementing it, Figure 2 As shown, a first liquid level sensor 161 and a second liquid level sensor 162 are arranged in the middle position of the front and rear sides of the second liquid collecting tank 112 where the liquid level needs to be controlled, so as to monitor the liquid level height of the second liquid collecting tank 112 in real time to prevent the liquid level from submerging the air gap position of the motor due to the liquid level height of the second liquid collecting tank 112 exceeding the warning height during the oil injection cooling process.

[0039] In some examples of the present application, the drainage circulation system 100 also includes a controller (not shown), which is respectively connected to the first liquid level sensor 161, the second liquid level sensor 162, the electromagnetic reversing valve 120 and the electric pump 130, and is used to trigger different working states of the electromagnetic reversing valve 120 and the electric pump 130 through feedback signals from the liquid level sensors.

[0040] In the present application, control cables of the electromagnetic reversing valve 120, the electric pump 130, the first liquid level sensor 161, and the second liquid level sensor 162 are connected to the controller, and the oil injection cooling is automatically operated according to a preset program.

[0041] In specific use, since this drainage circulation system is applied to a car, the car may encounter different road conditions during driving. Therefore, the liquid collecting pool 110 (the first liquid collecting pool 111 and the second liquid collecting pool 112) in the present application may tilt in different directions.

[0042] When the liquid collecting tank 110 tilts to the right, due to the action of gravity, the coolant will flow freely in the first liquid collecting tank 111 and the second liquid collecting tank 112. At this time, the liquid level in the second liquid collecting tank 112 will change. In order to prevent the liquid level in the second liquid collecting tank 112 from rising and submerging the air gap position of the motor, when the controller detects that the liquid level in the second liquid collecting tank 112 is lower than the preset liquid level (the low liquid level detection point of the two liquid level sensors) at the same time through the first liquid level sensor 161 and the second liquid level sensor 162 set in the second liquid collecting tank 112, the controller controls the electromagnetic reversing valve to make the liquid inlet of the electric pump connected with the second liquid collecting tank 112, and absorb the coolant from the second liquid collecting tank 112. Then, it is sprayed out from the first liquid spray port 151 and the second liquid spray port 152 through the pipeline. The coolant falling back to the first liquid collecting tank 111 automatically flows back to the second liquid collecting tank 112 through the reflux channel 171, and the second liquid collecting tank 112 forms a balance between liquid discharge and liquid inlet.

[0043] According to the same principle, when the liquid collecting tank 110 tilts forward and backward, due to the action of gravity, the coolant will flow freely in the first liquid collecting tank 111 and the second liquid collecting tank 112. At this time, the liquid level height in the second liquid collecting tank 112 will change, and the liquid levels detected by the first liquid level sensor 161 and the second liquid level sensor 162 will be different. As long as the first liquid level sensor 161 and the second liquid level sensor 162 detect that the liquid level in the second liquid collecting tank 112 is not lower than the preset liquid level (the low liquid level detection point of the two liquid level sensors) at the same time, the controller controls the electromagnetic reversing valve to connect the liquid inlet of the electric pump 130 with the second liquid collecting tank 112, and draw coolant from the second liquid collecting tank 112.

[0044] When the liquid collecting tank 110 tilts to the left, due to the effect of gravity, the coolant will flow freely in the first liquid collecting tank 111 and the second liquid collecting tank 112. At this time, the liquid level in the second liquid collecting tank 112 will change. If the left tilt is serious, the first liquid level sensor 161 and the second liquid level sensor 162 will detect that the liquid level in the second liquid collecting tank 112 is lower than the preset liquid level (the low liquid level detection point of the two liquid level sensors). At this time, the controller controls the electromagnetic reversing valve 120 to operate, so that the liquid inlet of the electric pump is connected to the first liquid collecting tank 111, and the coolant is sucked from the first liquid collecting tank 111. And it is sprayed out through the liquid spray port. The coolant falling back to the second liquid collecting tank 112 automatically flows back to the first liquid collecting tank 111 through the reflux channel 171, ensuring that the liquid level in the second liquid collecting tank 112 does not exceed the high liquid level detection point of the liquid level sensor. Thereby ensuring the normal operation of the motor. It can be understood that the controller in the present application controls the action of the electromagnetic reversing valve through the liquid level sensor signal, automatically switches the channel, realizes the conversion of the electric pump suction pool, and thus adjusts and controls the liquid level of the liquid collection pool.

[0045] In some examples of the present application, the electric pump and the electromagnetic reversing valve are integrally formed, and cooling liquid channels are provided inside the electric pump and the electromagnetic reversing valve.

[0046] In the present application, the electric pump and the electromagnetic reversing valve can be used as separate components and installed in the mounting position set on the wall of the liquid collecting tank; or the electric pump and the electromagnetic reversing valve can be integrated into one and then installed in the mounting position on the wall of the liquid collecting tank, so that the drainage system has the advantages of simple structure, small space occupation and high integration.

[0047] It can be understood that the description of the orientation in this application is based on Figure 1 and Figure 2 The orientation shown, during specific implementation, because the drainage circulation system is installed at a preset position on the car, different installation positions may cause the described orientation to change, which cannot be excluded from the protection scope of the technical solution of this application.

[0048] The embodiment of the present application also provides an electric driving force assembly, including the above-mentioned drainage circulation system. For other parts of the electric driving force assembly, reference may be made to the prior art, and this application will not elaborate on them.

[0049] It can be understood that the electric drive power assembly in the present application can automatically monitor the liquid level and automatically switch the liquid suction pool, so that the liquid level of the second liquid collection pool that needs liquid level control is monitored, and the coolant is automatically discharged and replenished to meet the needs of liquid level control in the liquid collection pool. In addition, the specific structure of the liquid discharge circulation system in the present application makes it compact, light and low in cost, and is suitable for the low-position layout system of the oil-cooled motor, which broadens the direction of the layout of the oil-cooled motor.

[0050] The embodiment of the present application also provides a car, comprising the electric drive power assembly as described above. For other parts of the car, reference may be made to the prior art, and the present application will not elaborate on them.

[0051] It should be noted that, in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0052] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0053] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0054] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0055] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0056] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A drainage circulation system, characterized in that: include: a first liquid collecting tank and a second liquid collecting tank, wherein the first liquid collecting tank and the second liquid collecting tank are connected to each other, and a first liquid level sensor and a second liquid level sensor are provided in the second liquid collecting tank, and the first liquid level sensor and the second liquid level sensor are used to respectively obtain the liquid level height of the second liquid collecting tank; An electromagnetic reversing valve, the electromagnetic reversing valve comprising a first liquid inlet and a second liquid inlet, the first liquid inlet and the second liquid inlet of the electromagnetic reversing valve extending into the first liquid collecting tank and the second liquid collecting tank respectively; and an electric pump, wherein the liquid inlet of the electric pump is connected to the liquid outlet of the electromagnetic reversing valve through a first pipeline, and the liquid outlet of the electric pump is connected to the corresponding liquid injection port through a second pipeline.

2. The drainage circulation system according to claim 1, characterized in that: A reflux channel is arranged between the first liquid collecting tank and the second liquid collecting tank, the cooling liquid level in the first liquid collecting tank is flush with the reflux channel, and the cooling liquid level in the second liquid collecting tank is lower than the reflux channel; or, the cooling liquid level in the second liquid collecting tank is flush with the reflux channel, and the cooling liquid level in the first liquid collecting tank is lower than the reflux channel.

3. The drainage circulation system according to claim 2, characterized in that: The first liquid collecting tank and the second liquid collecting tank have a common side surface, and the reflux channel is arranged on the common side surface.

4. The drainage circulation system according to claim 1, characterized in that: The internal spaces of the first liquid collecting tank and the second liquid collecting tank are communicated, and a cavity wall that is flush with the liquid surface of the coolant in the first liquid collecting tank is arranged in the internal space.

5. The drainage circulation system according to claim 2, characterized in that: The first liquid level sensor is arranged on the front side of the second liquid collecting tank, and the second liquid level sensor is arranged on the rear side of the second liquid collecting tank.

6. The drainage circulation system according to claim 2, characterized in that: It also includes a heat exchanger, wherein the liquid inlet of the heat exchanger is connected to the liquid outlet of the electric pump through a third pipeline, and the liquid outlet of the heat exchanger is connected to the corresponding liquid injection port through a fourth pipeline.

7. The drainage circulation system according to claim 2, characterized in that: The electric pump and the electromagnetic reversing valve are integrally formed, and cooling liquid channels are arranged inside the electric pump and the electromagnetic reversing valve.

8. The drainage circulation system according to claim 2, characterized in that: It also includes a controller, which is connected to the first liquid level sensor, the second liquid level sensor, the electromagnetic reversing valve and the electric pump respectively.

9. An electric drive power assembly, characterized in that: It comprises a drainage circulation system as claimed in any one of claims 1 to 8.

10. An automobile, characterized in that: Comprising the electric drive power assembly as claimed in claim 9.

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