A water replenishing exhaust device and a pretreatment method

Abstract

The embodiment of the present application discloses a water replenishing and exhausting device and a pretreatment method. The water replenishing and exhausting device comprises a liquid storage device configured to store deionized water flowing back from a device to be tested and provide the deionized water for the device to be tested; a heat exchange device configured to provide heat exchange for the deionized water in a pipeline; a first pipeline and a second pipeline in communication between the liquid storage device and the device to be tested; a third pipeline and a fourth pipeline in communication between the device to be tested and the heat exchange device; a fifth pipeline in communication between the heat exchange device and the liquid storage device; and a water inlet provided on the fourth pipeline and configured to communicate with an external deionized water source. The deionized water enters the fourth pipeline through the water inlet and circulates in the device to be tested, the third pipeline, the heat exchange device, the fifth pipeline, the liquid storage device, the first pipeline and the second pipeline.

Description

Technical Field

[0001] This application belongs to the field of engine technology, and in particular relates to a water replenishment and exhaust device and a pretreatment method. Background Technology

[0002] During the activation and rollout of a fuel cell engine system, the overall testing cycle has specific time requirements. Reducing the overall testing time for a single engine is a key focus for current R&D efforts. Connecting an engine to the system test bench requires injecting deionized water into the main cooling circuit and quickly removing air bubbles to shorten test preparation time. Current test preparation procedures typically involve placing the deionized water tank at a high position and relying on gravity to allow the water to flow into the engine circuit. This process is time-consuming and makes it difficult to completely remove air bubbles, impacting engine testing. Summary of the Invention

[0003] The purpose of this application is to provide a water replenishment and exhaust device and a pretreatment method.

[0004] According to a first aspect of the embodiments of this application, a water replenishment and exhaust device for an engine cooling system is provided, comprising: A liquid storage device configured to store deionized water returned from the device under test and to provide deionized water to the device under test; A heat exchange device configured to provide heat exchange for deionized water in a pipe; The liquid storage device is connected to the device under test by a first pipe and a second pipe; The device under test is connected to the heat exchanger by a third pipe and a fourth pipe; A fifth pipe connects the heat exchange device and the liquid storage device. The fourth pipe is equipped with a water inlet, which is configured to connect to an external water source. Deionized water enters the fourth pipe through the inlet and circulates within the device under test, the third pipe, the heat exchange device, the fifth pipe, the liquid storage device, the first pipe, and the second pipe.

[0005] Optionally, a switching device is provided on the first pipe, the third pipe, the fourth pipe, and the fifth pipe. The switching device is configured to open or close the first pipe, the third pipe, the fourth pipe, and the fifth pipe to control the delivery of deionized water.

[0006] Optionally, a detection device is provided on the third pipe, and the detection device is configured to detect changes in the flow rate of deionized water in the third pipe.

[0007] Optionally, manual valves are provided on the third and fourth pipes near the device under test.

[0008] Optionally, the liquid storage device is equipped with a liquid level sensor, which is configured to monitor the position of deionized water in the liquid storage device.

[0009] Optionally, the lower part of the liquid storage device is provided with a first water outlet, which is configured to discharge deionized water from inside the liquid storage device.

[0010] Optionally, the third pipe is provided with a second outlet, which is configured to discharge deionized water from inside the pipe.

[0011] Optionally, the water replenishment and exhaust device further includes a sixth pipe, which is connected to the water inlet. A filter device, a pressure detection device, and a switch device are sequentially installed on the sixth pipe. The sixth pipe is configured to provide deionized water to the device under test.

[0012] According to a second aspect of the embodiments of this application, a pretreatment method for a water replenishment and exhaust device is provided for activation of a fuel cell engine cooling system, comprising: First, turn on the switches for the first, fourth, and fifth pipes, while keeping the switch for the third pipe closed. Secondly, turn on the switch for the sixth pipe; Deionized water enters the test device through the sixth pipe, circulates in the test device, and then flows back to the storage device through the second pipe. The deionized water flowing back to the storage device enters the test device through the first pipe, circulates in the test device, and then flows back to the storage device through the second pipe. Then, when the level of deionized water flowing into the storage device is detected by the level sensor to reach the first preset position, the first pipe is closed and the switch of the third pipe is opened. Deionized water enters the test device through the sixth pipe, and after being circulated and vented in the test device, it flows back to the storage device through the third pipe, the heat exchange device and the fifth pipe. Finally, when the level of deionized water in the storage device is detected by the level sensor to reach the second preset position, the switch of the first flow pipe is turned off to complete the venting and water replenishment.

[0013] Optionally, the water replenishment and venting method further includes a first detection step, which is set after the sixth pipe is closed; In the first detection step, the switch of the first pipeline is turned on, and the drive device in the device under test is turned on. Deionized water enters the test device through the storage device, circulates in the test device, and then flows back to the storage device through the third pipe, the heat exchange device, and the fifth pipe. The system detects whether there are still air bubbles in the gas replenishment and exhaust device.

[0014] Optionally, it may also include a second detection step, which is set after the first detection step; In the second detection step, the switch for the fifth pipe is turned off; Deionized water enters the test device through the storage device, circulates in the test device, and then flows back to the test device through the third pipe, the heat exchange device, and the fourth pipe. This cycle is repeated to observe the changes in the test device.

[0015] One technical advantage of this application embodiment is that, through the above technical solution and pretreatment method, air bubbles in the device under test can be quickly removed, and water can be quickly replenished, thus shortening the test preparation time and improving work efficiency.

[0016] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present application and, together with their description, serve to explain the principles of the present application.

[0018] Figure 1 A schematic diagram of the water replenishment and exhaust device according to an embodiment of this application; Figure 2 The flowchart of the method steps of the water replenishment and exhaust device in this application embodiment.

[0019] Explanation of reference numerals in the attached drawings: Water replenishment and venting device 100; Device under test 1; Liquid storage device 2; First outlet 21; Heat exchange device 3; First pipe 4; First solenoid valve 41; Second pipe 5; Third pipe 6; Second outlet 61; Second solenoid valve 62; Detection device 63; Fourth pipe 7; Inlet 71; Third solenoid valve 72; Fifth pipe 8; Fourth solenoid valve 81; Sixth pipe 9; Filter device 91; Pressure detection device 92; Fifth solenoid valve 93; Manual valve 10; Water replenishment pipe 11; Sixth solenoid valve 12. Detailed Implementation

[0020] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0021] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0022] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0023] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0025] According to a first aspect of the present application, a water replenishment and exhaust device 100 for an engine cooling system is provided, comprising: a liquid storage device 2, the liquid storage device 2 being configured to store deionized water flowing back from a device under test and to provide deionized water to the device under test 1; Heat exchange device 3, which is configured to provide heat exchange for deionized water in the pipeline; The liquid storage device 2 is connected to the device under test 1 by a first pipe 4 and a second pipe 5. The first pipe 4 is configured to allow the deionized water from the storage device 2 to flow to the device under test 1, and the second pipe 5 is configured to allow the deionized water from the device under test 1 to flow to the storage device 2. The device under test 1 is connected to the heat exchange device 3 by a third pipe 6 and a fourth pipe 7; The third pipe 6 is configured to allow the deionized water from the device under test 1 to flow to the heat exchange device 3, and the fourth pipe 7 is configured to allow mutual flow between the device under test 1 and the heat exchange device 3. A fifth pipe 8 connects the heat exchange device 3 and the liquid storage device 2; the fifth pipe 8 is configured to allow the deionized water from the heat exchange device 3 to flow to the liquid storage device 2.

[0026] The fourth pipe 7 is provided with a water inlet 71, which is configured to connect to an external deionized water source. Deionized water enters the fourth pipe 7 through the inlet 71 and circulates within the device under test 1, the third pipe 6, the heat exchange device 3, the fifth pipe 8, the liquid storage device 2, the first pipe 4, and the second pipe 5.

[0027] Preferably, the device under test 1 is the main cooling circuit of the fuel cell engine. Before the fuel cell engine is off the production line, it is activated and water is supplied and air bubbles are discharged through the water supply and exhaust device 100, which shortens the water supply and exhaust time and thus improves working efficiency.

[0028] like Figure 1 As shown, the device under test 1 and the storage device 2 are connected by a first pipe 4 and a second pipe 5. The first pipe 4 is the pipe through which deionized water is input from the storage device 2 to the device under test 1, and the second pipe 5 is the pipe through which deionized water is returned from the device under test 1 to the storage device 2. When deionized water in the storage device 2 is input to the device under test 1 through the first pipe 4, the deionized water circulates in the device under test 1 and then returns to the storage device 2 through the second pipe 5.

[0029] like Figure 1 As shown, the device under test 1 is connected to the heat exchanger 3 via a third pipe 6 and a fourth pipe 7, and the heat exchanger 3 is connected to the storage device 2 via a fifth pipe 8. The third pipe 6 is the pipe through which deionized water flows from the device under test 1 to the heat exchanger 3, and the fifth pipe 8 is the pipe through which deionized water flows from the heat exchanger 3 to the storage device 2. After the deionized water circulates in the device under test 1, it flows back to the storage device 2 via the second pipe 5, and also flows back to the storage device 2 via the third pipe 6, the heat exchanger 3, and the fifth pipe 8. The fourth pipe 7 is a bidirectional flow pipe between the heat exchanger 3 and the device under test 1. When the third pipe 6 is closed, deionized water is injected into the fourth pipe 7 through the inlet 71. The deionized water flows to the device under test 1, circulates within it, and then flows to the storage device 2 via the second pipe 5. Simultaneously, the deionized water flows to the heat exchanger 3 and then flows back to the storage device 2 via the fifth pipe 8.

[0030] To further explain, the first pipe 4 connects the storage device 2 and the test device 1. When the first pipe 4 is open, deionized water in the storage device 2 can enter the test device 1. The second pipe 5 connects the storage device 2 and the test device 1. After the deionized water circulates in the test device 1, when the third pipe 6 is open, some deionized water will flow into the storage device 2 through the second pipe 5. When the third pipe 6 is closed, all the deionized water in the test device 1 will flow into the storage device 2 through the second pipe 5. The third pipe 6 connects the test device 1 and the heat exchanger 3. After the deionized water in the test device 1 circulates, it will flow into the heat exchanger 3 through the third pipe 6, where heat exchange occurs. The fifth pipe 8 connects the heat exchanger 3 and the storage device 2. After heat exchange, the deionized water flows into the storage device 2 through the fifth pipe 8. This circulation process removes air bubbles from the test device 1, the third pipe 6, the heat exchanger 3, and the fifth pipe 8.

[0031] To further explain, such as Figure 1 As shown, when deionized water is injected into the fourth pipe 7 from the inlet 71, the first pipe 4, the fourth pipe 7, and the fifth pipe 8 are initially open. On one hand, the deionized water flows into the storage device 2 through the test device 1 and the second pipe 5, thus dispelling air bubbles from the test device 1 and the second pipe 5. On the other hand, the deionized water flows into the storage device 2 through the fourth pipe 7 and the fifth pipe 8, dispelling air bubbles from the fourth pipe 7. The deionized water in the storage device 2 then enters the test device 1 through the first pipe 4, circulates within the test device 1, and then flows back into the storage device 2 through the second pipe 5. This process dispels air bubbles from the test device 1 into the storage device, preventing air bubbles from affecting the operation of the test device.

[0032] Optionally, a switching device is provided on the first pipe 4, the third pipe 6, the fourth pipe 7 and the fifth pipe 8. The switching device is configured to open or close the first pipe 4, the third pipe 6, the fourth pipe 7 and the fifth pipe 8 to control the delivery of deionized water.

[0033] like Figure 1 As shown, switching devices are installed on the first pipe 4, the third pipe 6, the fourth pipe 7, and the fifth pipe 8. Specifically, the first pipe 4 is equipped with a first solenoid valve 41, the third pipe 6 with a second solenoid valve 62, the fourth pipe 7 with a third solenoid valve 72, and the fifth pipe 8 with a fourth solenoid valve 81. In a preferred embodiment, the first solenoid valve 41, the second solenoid valve 62, the third solenoid valve 72, and the fourth solenoid valve 81 are automatically controlled. A control device (not shown in the figure) controls their opening or closing according to switching requirements, shortening the time and improving efficiency.

[0034] Optionally, a detection device 63 is provided on the third pipe 6, and the detection device 63 is configured to detect the change in the flow rate of deionized water in the third pipe 6.

[0035] like Figure 1 As shown, a detection device 63 is installed in the section of the third pipe 6 near the heat exchanger 3. Preferably, the detection device 63 is a flow meter. After the water replenishment and air bubble removal are completed, the flow rate of the deionized water flowing in the third pipe 6 is observed. If the flow rate output by the flow meter is stable, it indicates that all the air bubbles in the pipe have been removed. If the flow rate output by the flow meter fluctuates, it indicates that air bubbles still exist in the pipe, and the water replenishment and air venting device 100 needs to be restarted to remove the air bubbles from the pipe.

[0036] Optionally, manual valves 10 are provided on the third pipe 6 and the fourth pipe 7 near the device under test 1.

[0037] like Figure 1 As shown, manual valves 10 are installed at the ends of the third pipe 6 and the fourth pipe 7 near the device under test 1. The manual valves 10 are configured to close the third pipe 6 and the fourth pipe 7. When the water replenishment and venting are completed, and the device under test 1 needs to be removed, the third pipe 6 and the fourth pipe 7 are closed by the manual valves 10 to prevent the deionized water in the third pipe 6 and the fourth pipe 7 from flowing out of the pipe openings.

[0038] Optionally, the liquid storage device 2 is provided with a liquid level sensor, which is configured to monitor the position of deionized water in the liquid storage device 2.

[0039] To further explain, the liquid storage device 2 has an upper and lower liquid level, which are detected by a liquid level sensor. The upper liquid level indicates that the liquid in the storage device 2 has reached its upper limit, and the lower liquid level indicates that the liquid in the storage device 2 has reached its lower limit. The liquid level sensor can monitor the position of the liquid level in the storage device 2, thereby determining the liquid level status. Therefore, the control system can control the operation steps of the water replenishment and venting device 100 based on the obtained information.

[0040] In a preferred embodiment, the second pipe 5 and the fifth pipe 8 are positioned above the upper liquid level at the connection port of the liquid storage device 2. This prevents deionized water from flowing back into the test device 1 through the second pipe 5 and the fifth pipe 8 when the liquid level reaches the upper level. The first pipe 4 is positioned below the lower liquid level at the connection port of the liquid storage device 2. This arrangement allows deionized water to flow through the first pipe 4 to the test device 1 initially, before the water level in the liquid storage device 2 reaches the lower level, and to circulate within the test device 1, the second pipe 5, and the liquid storage device 2.

[0041] Optionally, the lower part of the liquid storage device 2 is provided with a first water outlet 21, which is configured to discharge deionized water from inside the liquid storage device 2.

[0042] like Figure 1 As shown, the lower part of the liquid storage device 2 is provided with a first water outlet 21. After the water replenishment and venting are completed, the deionized water in the liquid storage device 2 is discharged through the first water outlet 21.

[0043] Optionally, the third pipe 6 is provided with a second outlet 61, which is configured to discharge deionized water from inside the pipe.

[0044] like Figure 1 As shown, a second water outlet 61 is provided on the third pipe 6. After the water replenishment and air venting are completed, the deionized water in the pipe is discharged through the second water outlet 61.

[0045] Optionally, the water replenishment and exhaust device 100 further includes a sixth pipe 9, which is connected to the water inlet 71. A filter device 91, a pressure detection device 92, and a switch device are sequentially arranged on the sixth pipe 9. The sixth pipe 9 is configured to provide deionized water to the device under test 1.

[0046] like Figure 1 As shown, a fifth solenoid valve 93 is installed on the sixth pipe 9. The fifth solenoid valve 93 is automatically controlled, and its opening or closing is controlled by a control device (not shown in the figure) according to the switching requirements, which shortens the time and improves efficiency.

[0047] To further explain, the sixth pipe 9 is a water supply pipe, and it is connected to the water inlet 71 on the fourth pipe 7. Water is supplied through the sixth pipe 9 to replenish the water in the device under test 1.

[0048] The sixth pipe 9 is equipped with a filter device 91 at its inlet to reduce impurities in the deionized water flowing into the device under test 1, and to prevent impurities in the deionized water from remaining in the device under test 1 and affecting its use.

[0049] The sixth pipe 9 is equipped with a pressure detection device 92, which monitors and provides pressure for the deionized water flowing into the test device 1 through the sixth pipe 9, ensuring that it remains within a preset pressure range. During air venting and water replenishment, the pressure of the deionized water flowing into the test device 1 through the sixth pipe 9 allows the deionized water entering the test device 1 to flow through the third pipe 6, heat exchanger 3, and fifth pipe 8 into the storage device 2, achieving rapid water replenishment and air bubble removal, thereby shortening the time and improving efficiency.

[0050] Preferably, the pressure detection device 92 can be a pressure pump with a pressure sensor to provide pressure and monitor the pressure of the deionized water in the sixth pipe 9.

[0051] like Figure 1 As shown, in a preferred embodiment, the sixth pipe 9 is connected to the liquid storage device 2 via a water replenishment pipe 11. A sixth solenoid valve 12 is installed on the water replenishment pipe 11, and a fifth solenoid valve is used to open or close the water replenishment pipe 11. When water replenishment and venting are completed, if the deionized water in the liquid storage device 2 cannot complete internal circulation, or if there is a loss of deionized water in the liquid storage device 2, water can be replenished to the liquid storage device 2 through the water replenishment pipe 11. This method allows for rapid water replenishment without needing to circulate it within the device under test 1, saving time and improving efficiency.

[0052] like Figure 2 As shown, according to a second aspect of the embodiments of this application, a pretreatment method for a water replenishment and exhaust device 100 is provided for the activation of a fuel cell engine cooling system, comprising: First, turn on the switches for the first pipe 4, the fourth pipe 7, and the fifth pipe 8, while keeping the switch for the third pipe 6 closed; Next, turn on the switch for pipe 9, number six; Deionized water enters the test device 1 through the sixth pipe 9, circulates in the test device 1, and then flows back to the storage device 2 through the second pipe 5. The deionized water flowing back to the storage device 2 enters the test device 1 through the first pipe 4, circulates in the test device 1, and then flows back to the storage device 2 through the second pipe 5. Then, when the level of deionized water flowing into the storage device 2 is detected by the level sensor to reach the first preset position, the first pipe 4 is closed and the switch of the third pipe 6 is opened. Deionized water enters the test device 1 through the sixth pipe 9, circulates in the test device 1, and then flows back to the storage device 2 through the third pipe 6, the heat exchange device 3 and the fifth pipe 8. Finally, when the level of deionized water in the storage device 2 is detected by the level sensor to reach the second preset position, the switch of the sixth pipe 9 is turned off to complete the venting and water replenishment.

[0053] Preferably, a thermostat is installed inside the device under test 1, which controls the operation of all valves inside the unused device under test 1. A water pump is also installed inside the device under test 1, which drives the flow of deionized water within the device under test 1.

[0054] In a preferred embodiment, the thermostat is first set to the fully open state to ensure that all valves in the device under test 1 are open in preparation for subsequent water replenishment and venting.

[0055] like Figure 2 As shown, firstly, the switch of the first solenoid valve 41 on the first pipe 4 is turned on, the switch of the third solenoid valve 72 on the fourth pipe 7 is turned on, and the switch of the fourth solenoid valve 81 on the fifth pipe 8 is turned on.

[0056] Next, turn on the switch of the fifth solenoid valve 93 on the sixth pipe 9.

[0057] As described above, the sixth pipe 9 is a water supply pipe. At this time, the deionized water in the sixth pipe 9 will flow into the fourth pipe 7. On one hand, the deionized water flowing into the fourth pipe 7 will flow into the device under test 1, where it will circulate, and then flow into the storage device 2 through the second pipe 5. On the other hand, the deionized water flowing into the fourth pipe 7 will flow into the storage device 2 through the fifth pipe 8. Therefore, when the deionized water in the sixth pipe 9 flows into the fourth pipe 7 for circulation, it will expel the air bubbles from the device under test 1, the second pipe 5, the fourth pipe 7, and the fifth pipe 8 into the storage device 2, completing the air venting process of the aforementioned devices.

[0058] Since the first solenoid valve 41 of the first pipe 4 is open, when deionized water flows into the storage device 2, the deionized water in the storage device 2 will flow to the test device 1 through the first pipe 4, circulate in the test device 1, and then flow back to the storage device 2 through the second pipe 5. At this time, the air bubbles in the first pipe 4 will be discharged into the storage device 2.

[0059] Then, when the level of deionized water flowing into the storage device 2 after circulation in the sixth pipe 9 reaches the first preset position, where the first preset position is the lower liquid level, the first solenoid valve 41 on the first pipe 4 is closed, the third solenoid valve 72 on the fourth pipe 7 is opened, and the switch of the fifth solenoid valve 93 on the sixth pipe 9 is set to periodically open.

[0060] To further explain, when the deionized water in the storage device 2 is at the first preset position, it ensures that a deionized water circulation relationship is established between each pipe and the storage device 2, preventing the deionized water from failing to flow into the storage device 2 due to the air bubbles being discharged into it. To allow the device under test 1 to quickly replenish water and release air, the first solenoid valve 41 on the first pipe 4 is closed.

[0061] To further explain, opening the second solenoid valve 62 on the third pipe 6 allows the deionized water flowing into the test device 1 to circulate within it before flowing into the storage device 2 through the third pipe 6, heat exchanger 3, and fifth pipe 8, thus discharging air bubbles from the third pipe 6 and heat exchanger 3. Conversely, after circulating in the test device 1, the water then flows into the storage device 2 through the second pipe 5. This bidirectional replenishment of water to the storage device 2 provides rapid replenishment, saving time and improving efficiency.

[0062] Further explanation: the fifth solenoid valve 93 in the sixth pipe 9 is configured to operate in a periodic pulse mode. Preferably, the fifth solenoid valve 93 is configured to open for 1s-3s, then close for 1s-3s. In an optimal embodiment, the fifth solenoid valve 93 is configured to open for 2s, then close for 2s. This periodic pulse water replenishment and venting not only provides water pressure to the water flowing into the device under test 1, quickly expelling air bubbles from inside the device, but also rapidly replenishes water, causing the water level in the storage device 2 to reach the second preset position, which is the upper liquid level. Once the second preset position is reached, no external water source is needed, and internal circulation can be achieved, thus completing the water replenishment.

[0063] Optionally, the water replenishment and venting method further includes a first detection step, which is set after the sixth pipe 9 is closed; In the first detection step, the switch of the first pipe 4 is turned on, and the drive device in the device under test 1 is turned on. Deionized water enters the test device 1 through the storage device 2, circulates in the test device 1, and then flows back to the storage device 2 through the third pipe 6, the heat exchange device 3, and the fifth pipe 8. The system then checks whether air bubbles still exist in the gas replenishment and exhaust device 100.

[0064] To further explain, the device under test 1 is equipped with a drive unit, which is a water pump. The water pump can drive the flow of deionized water in the device under test 1.

[0065] After water replenishment and venting are completed, it is necessary to check whether air bubbles exist in the device under test 1. Turn on the water pump in the device under test 1 and set it to the minimum speed to keep the deionized water in the pipeline flowing. Open the first solenoid valve 41 on the first pipeline 4. At this time, the deionized water in the storage device 2 flows into the device under test 1 through the first pipeline 4, circulates in the device under test 1, and then flows back to the storage device 2 through the third pipeline 6, the heat exchange device 3, and the fifth pipeline 8. During this period, observe the change in the flow rate value of the detection device 63 on the third pipeline 6. If there is no fluctuation, it means that the air bubbles in the device under test 1 have been completely vented. If the flow rate value of the detection device 63 fluctuates, it means that there are still air bubbles in the device under test 1, and the above water replenishment and venting steps need to be repeated. Alternatively, it can be visually observed whether there are still air bubbles in the second pipeline 5. If there are air bubbles in the second pipeline 5, the above water replenishment and venting steps need to be repeated. The second pipeline 5 is made of transparent material to facilitate visual observation of whether there are air bubbles in the pipeline.

[0066] Optionally, it may also include a second detection step, which is set after the first detection step; In the second detection step, the switch for the fifth pipe 8 is turned off; Deionized water enters the test device 1 through the storage device 2, circulates in the test device 1, and then flows back to the test device 1 through the third pipe 6, the heat exchange device 3 and the fourth pipe 7. This cycle is repeated, and the changes in the detection device 63 are observed.

[0067] To further explain, in the first detection step, the flow rate of detection device 63 did not change, so the second detection step was performed. In the second detection step, the fourth solenoid valve 81 on the fifth pipe 8 was closed. At this time, deionized water, under the action of the water pump in the device under test 1, would circulate in the device under test 1, the third pipe 6, the heat exchange device 3, and the fourth pipe 7. The flow rate of detection device 63 was then observed to see if it changed. If there was no fluctuation, it meant that the air bubbles in the device under test 1 had been completely removed. If there was a fluctuation, the above steps of replenishing water and venting air needed to be repeated.

[0068] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A water supply and exhaust device for an engine cooling system, characterized in that, include: A liquid storage device configured to store deionized water returned from the device under test and to provide deionized water to the device under test; A heat exchange device configured to provide heat exchange for deionized water in a pipe; The liquid storage device is connected to the device under test by a first pipe and a second pipe; The device under test is connected to the heat exchanger by a third pipe and a fourth pipe; A fifth pipe connects the heat exchange device and the liquid storage device. The fourth pipe is equipped with a water inlet, which is configured to connect to an external deionized water source. The fourth pipe is a bidirectional flow pipe. The water replenishment and exhaust device also includes a sixth pipe, which is connected to the water inlet and is configured to provide deionized water to the device under test. Deionized water enters the fourth pipe through the inlet and circulates within the device under test, the third pipe, the heat exchange device, the fifth pipe, the liquid storage device, the first pipe, and the second pipe. Each of the first pipe, the third pipe, the fourth pipe, and the fifth pipe is equipped with a switch device, which is configured to open or close the first pipe, the third pipe, the fourth pipe, and the fifth pipe to control the delivery of deionized water; The switching devices of the first pipe, the fourth pipe, the fifth pipe, and the sixth pipe are all controlled to be in the open state by the control device, and the switching device of the third pipe is controlled to be in the closed state by the control device. When deionized water enters the device under test through the sixth pipe, it flows back to the storage device through the second pipe. Deionized water enters the fourth pipe through the sixth pipe and flows into the storage device through the fifth pipe.

2. The water replenishment and venting device according to claim 1, characterized in that, A detection device is installed on the third pipe, and the detection device is configured to detect changes in the flow rate of deionized water in the third pipe.

3. The water replenishment and venting device according to claim 1, characterized in that, Manual valves are installed on the third and fourth pipes near the device under test.

4. The water replenishment and venting device according to claim 1, characterized in that, The liquid storage device is equipped with a liquid level sensor, which is configured to monitor the position of deionized water in the liquid storage device.

5. The water replenishment and venting device according to claim 1, characterized in that, The liquid storage device is provided with a first water outlet at the bottom, which is configured to discharge deionized water from inside the liquid storage device.

6. The water replenishment and venting device according to claim 1, characterized in that, The third pipe is provided with a second water outlet, which is configured to discharge deionized water from inside the pipe.

7. The water replenishment and venting device according to claim 1, characterized in that, The sixth pipeline is equipped with a filter device, a pressure detection device, and a switch device in sequence.

8. A pretreatment method using the water replenishment and exhaust device according to any one of claims 1 to 7, for activation of a fuel cell engine cooling system, characterized in that, include: First, turn on the switches for the first, fourth, and fifth pipes, while keeping the switch for the third pipe closed. Secondly, turn on the switch for the sixth pipe; Deionized water enters the test device through the sixth pipe, circulates in the test device, and then flows back to the storage device through the second pipe. The deionized water flowing back to the storage device enters the test device through the first pipe, circulates in the test device, and then flows back to the storage device through the second pipe. Then, when the level of deionized water flowing into the storage device is detected by the level sensor to reach the first preset position, the first pipe is closed and the switch of the third pipe is opened. Deionized water enters the test device through the sixth pipe, and after being circulated and vented in the test device, it flows back to the storage device through the third pipe, the heat exchange device and the fifth pipe. Finally, when the level of deionized water in the storage device is detected by the level sensor to reach the second preset position, the switch of the sixth pipe is turned off to complete the venting and water replenishment.

9. The pretreatment method according to claim 8, characterized in that, The pretreatment method further includes a first detection step, which is set after the sixth pipe is closed; In the first detection step, the switch of the first pipeline is turned on, and the drive device in the device under test is turned on. Deionized water enters the device under test through the storage device, circulates in the device under test, and then flows back to the storage device through the third pipe, the heat exchange device, and the fifth pipe to detect whether there are still bubbles in the gas replenishment and exhaust device.

10. The pretreatment method according to claim 9, characterized in that, It also includes a second detection step, which is set after the first detection step; In the second detection step, the switch for the fifth pipe is turned off; Deionized water enters the test device through the storage device, circulates in the test device, and then flows back to the test device through the third pipe, the heat exchange device, and the fourth pipe. This cycle is repeated to observe the changes in the test device.

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