A high-low temperature water-cooled alternating switching cooling system and a cooling method

Abstract

The application discloses a high-low temperature water cooling alternating switching cooling system and a cooling method. The device part comprises a high-temperature water tank, a low-temperature water tank, a fast water path unit, a slow water path unit, a cooling unit, an EGR cooling device and a backflow temperature control module. The high-temperature water tank and the low-temperature water tank are connected with the fast water path unit and the slow water path unit respectively. The EGR cooling device is arranged in series in the cooling unit. The backflow temperature control module is used for cooling the cooling water flowing through the EGR cooling device and backflowing to the corresponding high-temperature water tank or low-temperature water tank. Through the arrangement of the fast water path unit and the slow water path unit corresponding to the high-temperature water tank and the low-temperature water tank respectively, the accurate flow control and the valve switching are realized, and the rapid and stable switching of the cooling water between the high temperature and the low temperature is realized.

Description

Technical Field

[0001] This invention belongs to the field of cooling system technology, specifically relating to a high and low temperature water-cooled alternating switching cooling system and cooling method. Background Technology

[0002] The cooling system is a crucial component of a car engine, significantly impacting its power, fuel economy, and reliability. As engine speeds and power outputs continue to increase, the demands on cooling systems also rise. Currently, most engines employ closed-loop forced cooling systems, primarily consisting of a water pump, thermostat, radiator, and engine cooler.

[0003] The cooling path of the coolant is: water pump - engine cooler - engine block - thermostat - radiator - water pump. Because this forced cooling system shares a single water pump and water tank, the flow distribution of each component relies on pressure resistance, and the heat from the coolant in all components is dissipated through the single water tank. Therefore, the system suffers from high resistance, high pump energy consumption, and the inability to precisely control the coolant flow to each component, leading to problems such as insufficient or excessive cooling.

[0004] In existing technologies, some cooling systems employ multiple water tanks with different temperatures to meet the cooling requirements of different cooling components. However, during the switching of coolant output from each tank, the coolant must pass through the same cooling pipe to cool the components. When the cooling pipe is long, the coolant in each tank will mix, causing temperature changes in each tank and affecting the cooling operation of subsequent components. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention provides a high and low temperature water-cooled alternating switching cooling system and cooling method to solve the technical problem of coolant mixing in multi-tank cooling systems.

[0006] To achieve the above objectives, the specific technical solution of the present invention is as follows:

[0007] In a first aspect, a high-low temperature water-cooled alternating cooling system includes a high-temperature water tank, a low-temperature water tank, a fast-flow water circuit unit, a slow-flow water circuit unit, a cooling unit, and a reflux temperature control module. The high-temperature water tank and the low-temperature water tank are respectively connected to the fast-flow water circuit unit and the slow-flow water circuit unit.

[0008] The end of the fast water conveyance unit is equipped with a high-temperature reflux branch and a high-temperature cooling branch that can be switched between each other; the high-temperature reflux branch is connected to the high-temperature water tank; and the high-temperature cooling branch is connected to the input end of the cooling unit.

[0009] The slow-flow water circuit unit is equipped with a switchable low-temperature reflux branch and a low-temperature cooling branch. The low-temperature cooling branch is connected to the high-temperature cooling branch, both leading to the input of the cooling unit. The low-temperature cooling branch and the high-temperature cooling branch alternately start and stop. The low-temperature reflux branch is connected to the reflux temperature control module.

[0010] An EGR cooling device is connected in series within the cooling unit; the EGR cooling device is cooled by alternating high and low temperature cooling water flowing through the cooling unit.

[0011] The reflux temperature control module is used to cool the cooling water flowing through the EGR cooling device and return it to the corresponding high-temperature water tank or low-temperature water tank.

[0012] Furthermore, the rapid water transfer unit includes a rapid water transfer pump, a high-temperature two-way ball valve, a high-flow meter, a cooling temperature control component, and a large water pump impact valve, all connected in series. The rapid water transfer pump is used to draw cooling water from the high-temperature water tank; the high-flow meter is used to measure the flow rate of the high-temperature cooling water drawn by the rapid water transfer pump; the output end of the cooling temperature control component is connected to the large water pump impact valve and is used to cool the high-temperature cooling water output from the high-temperature water tank. A high-temperature return branch and a high-temperature cooling branch are located on the large water pump impact valve.

[0013] Furthermore, the cooling and temperature control assembly includes a high-temperature heat exchanger and a temperature sensor. The high-temperature heat exchanger contains a cooling pipe and a liquid delivery pipe for heat exchange. The cooling pipe has a coolant inlet and a coolant outlet at each end. The liquid delivery pipe is connected to a high-flow meter and a high-pressure water pump impact valve at each end. The temperature sensor is located at the outlet of the liquid delivery pipe.

[0014] Furthermore, the slow-flow water circuit unit includes a cryogenic two-way ball valve, a slow-flow water pump, a small flow meter, a small water pump impact switch valve, and a small water pump impact valve, all arranged in series. The cryogenic two-way ball valve controls the flow of water from the slow-flow water pump into the cryogenic cooling water tank. The small flow meter measures the flow rate of the cryogenic cooling water drawn by the small water pump; the small water pump impact switch valve controls the flow of cryogenic cooling water to the small water pump impact valve. The cryogenic return branch and the cryogenic cooling branch are located on the small water pump impact valve.

[0015] Furthermore, a heater is provided on the high-temperature reflux branch.

[0016] Furthermore, a normal on / off unit is provided between the output ends of the high-temperature water tank and the low-temperature water tank. This normal on / off unit allows cooling water from the high-temperature water tank to be output to the high-temperature heat exchanger side via a slow-transport water circuit unit when both the high-temperature two-way ball valve and the low-temperature two-way ball valve are in the off state.

[0017] Furthermore, the normal on / off unit includes a two-way ball valve, a small water pump inlet valve, and a water pump switching valve. The two-way ball valve and the small water pump inlet valve are connected in series and positioned between the high-temperature water tank and the low-temperature water tank, used to switch the output water path of the high-temperature cooling water in the high-temperature water tank from the fast-flow water path unit to the slow-flow water path unit. The water pump switching valve is positioned between the large flow meter and the high-temperature heat exchanger, used to switch the connection between the fast-flow water pump and the high-temperature heat exchanger or between the slow-flow water pump and the high-temperature heat exchanger.

[0018] Furthermore, the cooling unit includes a cooling inlet pipe, a cooling return pipe, and two cooling two-way ball valves. The input end of the cooling inlet pipe is connected to the output end of the fast-flow water circuit unit and the output end of the slow-flow water circuit unit; the cooling return pipe is connected to the return flow temperature control module. The two cooling two-way ball valves are connected in series with the cooling inlet pipe and the cooling return pipe, respectively.

[0019] Furthermore, the reflux temperature control module includes a reflux switching valve, a large plate heat exchanger, a small plate heat exchanger, and a cooling control assembly. The reflux switching valve has three ports: a reflux inlet, a high-temperature reflux inlet, and a low-temperature reflux inlet. The output end of the cooling reflux pipe is connected to the reflux inlet. The two ends of the large plate heat exchanger are connected to the high-temperature reflux inlet and the high-temperature reflux branch, respectively. The low-temperature reflux branch of the small water pump impact valve and the low-temperature reflux inlet on the reflux switching valve are both connected to the input end of the small plate heat exchanger, and their output ends are connected to the low-temperature water tank. The cooling control assembly is used to cool the cooling water flowing through the large or small plate heat exchanger.

[0020] Secondly, a cooling method for a high-low temperature water-cooled alternating cooling system includes the following steps:

[0021] S1, Equipment installation: Install the EGR cooling device in the cooling unit, with its two ends connected to the cooling inlet pipe and cooling return pipe in the cooling unit, respectively.

[0022] S2, High-Temperature Cooling: The large water pump impact valve in the fast-flow water circuit unit is switched to the high-temperature cooling branch. The small water pump impact valve in the slow-flow water circuit unit is switched to the low-temperature reflux branch. High-temperature cooling water in the high-temperature water tank is drawn by the fast-flow water pump and used to cool the EGR cooling device in the cooling unit. After cooling, the high-temperature cooling water is returned to the high-temperature water tank after being controlled by the reflux temperature control module, and then circulated. The entire circulation time is 1 minute.

[0023] S3, Low-Temperature Cooling: The large water pump impact valve in the fast-flow water circuit unit is switched to the high-temperature return branch; the small water pump impact valve in the slow-flow water circuit unit is switched to the low-temperature cooling branch. Low-temperature cooling water from the low-temperature water tank is drawn by the small water pump and used to cool the EGR cooling device in the cooling unit. After cooling, the low-temperature cooling water is returned to the low-temperature water tank after temperature control by the return flow temperature control module, and then circulates for a total cycle time of 1 minute.

[0024] S4, cyclical alternating cooling, alternately executing steps S2 and S3, cycle 5000 times, to achieve high and low temperature water cooling alternating switching cooling for the EGR cooling device.

[0025] S5, Data Analysis: Record the temperature displayed by the temperature sensor at the cooling return pipe in the cooling unit during each thermal shock cycle test; based on the monitored temperature data, evaluate the heat exchange efficiency of the EGR cooling device and the stability of the system temperature control.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] 1. This invention sets up a fast water delivery unit and a slow water delivery unit, corresponding to a high-temperature water tank and a low-temperature water tank respectively. Through precise flow control and valve switching, it achieves rapid and stable switching of cooling water between high and low temperatures.

[0028] 2. The present invention provides a high-temperature reflux branch and a high-temperature cooling branch that can be switched at the end of the fast water conveyance unit; and a low-temperature reflux branch and a low-temperature cooling branch that can be switched at the end of the slow water conveyance unit. This ensures that when switching between high and low temperature cooling, the cooling water in the other water tank is in a temperature-controlled circulation, so that its temperature is always maintained within the specified range, thereby reducing the impact caused by the mixing of cooling water of different temperatures in the later stage. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the pipeline structure of the fast water conveyance unit and the slow water conveyance unit in this invention. Figure 1 (Enlarged view of part A in the middle)

[0031] Figure 3 This is a schematic diagram of the pipeline structure of the large water pump impact valve and the small water pump impact valve in this invention. Figure 1 (Enlarged view of part B in the middle section).

[0032] Attached reference numerals: 1. High-temperature water tank; 2. Low-temperature water tank; 3. Fast-flow water circuit unit; 3-1. Fast-flow water pump; 3-2. High-temperature two-way ball valve; 3-3. Large flow meter; 3-4. Large water pump impact valve; 3-4-1. High-temperature reflux branch; 3-4-2. High-temperature cooling branch; 3-5. High-temperature heat exchanger; 4. Slow-flow water circuit unit; 4-1. Low-temperature two-way ball valve; 4-2. Slow-flow water pump; 4-3. Small flow meter; 4-4. Small water pump impact switch valve; 4-5. Small water pump impact valve; 4-5-1. Low-temperature reflux branch; 4-5-2. Low-temperature cooling branch; 5. Cooling unit; 5-1. Cooling inlet pipe; 5-2. Cooling reflux. 6. EGR cooling device; 7. Reflux temperature control module; 7-1. Reflux switching valve; 7-1-1. Reflux inlet; 7-1-2. High temperature reflux port; 7-1-3. Low temperature reflux port; 7-2. Large plate heat exchanger; 7-3. Small plate heat exchanger; 7-4. High temperature cooling pipeline; 7-5. Low temperature cooling pipeline; 7-6. Cooling water regulating valve; 8. Heater; 9. Normal on / off unit; 9-1. Switching two-way ball valve; 9-2. Small water pump inlet valve; 9-2-1. High temperature slow delivery inlet; 9-2-2. Low temperature slow delivery inlet; 9-3. Water pump switching valve; 9-3-1. Alternating input port; 9-3-2. Normal input port. Detailed Implementation

[0033] In the description of this invention, it should be understood that the terms "one end", "the other end", "outer side", "upper side", "inner side", "horizontal", "coaxial", "center", "end", "length", "outer end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0034] The invention will now be further described with reference to the accompanying drawings.

[0035] like Figure 1 and 2 As shown, a high-low temperature water-cooled alternating cooling system includes a high-temperature water tank 1, a low-temperature water tank 2, a fast-flow water circuit unit 3, a slow-flow water circuit unit 4, a cooling unit 5, and a reflux temperature control module 7. The high-temperature water tank 1 and the low-temperature water tank 2 are connected to the cooling unit 5 via the fast-flow water circuit unit 3 and the slow-flow water circuit unit 4, respectively.

[0036] The fast-flow water circuit unit 3 and the slow-flow water circuit unit 4 alternately output cooling water from the high-temperature water tank 1 and the low-temperature water tank 2 to the hot-cold switching module at different flow rates. The EGR cooling device 6 is connected in series in the cooling unit 5. The EGR cooling device is cooled by alternating high and low temperature cooling water flowing through the cooling unit.

[0037] The reflux temperature control module 7 is used to cool the cooling water flowing through the EGR cooling device 6 and return it to the corresponding high-temperature water tank 1 or low-temperature water tank 2.

[0038] Specifically, such as Figure 2 As shown, the fast-transfer water circuit unit 3 includes a fast-transfer water pump 3-1, a high-temperature two-way ball valve 3-2, a large flow meter 3-3, a cooling temperature control component, and a large water pump impact valve 3-4. The fast-transfer water pump 3-1, the high-temperature two-way ball valve 3-2, the large flow meter 3-3, the water pump switching valve 9-3, the cooling temperature control component, and the large water pump impact valve 3-4 are connected in series to form a fast-transfer cooling water circuit.

[0039] The fast-flow water pump 3-1 is used to draw cooling water from the high-temperature water tank 1 and output it to the cooling unit 5. The high-temperature two-way ball valve 3-2 is used to control the flow of cooling water output from the fast-flow water pump 3-1. The high-flow meter 3-3 is used to measure the flow rate of cooling water in the fast-flow cooling water circuit. The cooling temperature control assembly is used to cool the high-temperature cooling water output from the high-temperature water tank 1, thereby precisely controlling the temperature of the output cooling water.

[0040] The large water pump impact valve 3-4 is equipped with two high-temperature water flow branches: a high-temperature return branch 3-4-1 and a high-temperature cooling branch 3-4-2. The high-temperature return branch 3-4-1 is connected to the high-temperature water tank 1; the high-temperature cooling branch 3-4-2 is connected to the input terminal of the cooling unit 5. When the large water pump impact valve 3-4 switches to the high-temperature return branch 3-4-1, the high-temperature cooling water will return to the high-temperature water tank 1. When the large water pump impact valve 3-4 switches to the high-temperature cooling branch 3-4-2, it will provide high-temperature cooling to the EGR cooling device 6 in the cooling unit 5.

[0041] In this embodiment, the cooling and temperature control assembly includes a high-temperature heat exchanger 3-5 and a temperature sensor. The high-temperature heat exchanger 3-5 contains a cooling pipe and a liquid delivery pipe for heat exchange. Coolant inlet and outlet pipes are connected to both ends of the cooling pipe. The liquid delivery pipe is connected in series in a fast-flow cooling water circuit. The temperature sensor is located at the outlet of the liquid delivery pipe.

[0042] When the high-temperature cooling water in the fast-flow cooling water circuit flows through the liquid delivery pipe, it will undergo heat exchange with the coolant in the cooling pipe, and with the help of the temperature sensor, it can achieve precise temperature control of the high-temperature cooling water in the high-temperature water tank 1.

[0043] In this embodiment, the flow rate of cooling water drawn by the fast water pump 3-1 is 400 L / min.

[0044] The slow-flow water circuit unit 4 includes a low-temperature two-way ball valve 4-1, a slow-flow water pump 4-2, a small flow meter 4-3, a small water pump impact switch valve 4-4, and a small water pump impact valve 4-5. These components are connected in series to form a slow-flow cooling water circuit. The low-temperature two-way ball valve 4-1 controls the flow of cooling water from the low-temperature water tank 2 to the slow-flow water pump 4-2. The small flow meter 4-3 measures the flow rate of cooling water in the slow-flow water circuit. The small water pump impact switch valve 4-4 controls the flow of low-temperature cooling water to the small water pump impact valve 4-5.

[0045] The small water pump impact valve 4-5 is equipped with two low-temperature water flow branches: a low-temperature reflux branch 4-5-1 and a low-temperature cooling branch 4-5-2. The low-temperature reflux branch 4-5-1 is connected to the reflux temperature control module 7, allowing the water to be cooled by the module and then returned to the low-temperature water tank 2. The low-temperature cooling branch 4-5-2 is connected to the high-temperature cooling branch 3-4-2, both leading to the input end of the cooling unit 5. Operators can switch the connection between the low-temperature cooling branch 4-5-2 or the high-temperature cooling branch 3-4-2 and the cooling unit 5 to achieve alternating high and low temperature water cooling for the EGR cooling device 6.

[0046] In this embodiment, the flow rate of cooling water drawn by the slow-flow water pump 4-2 is 20 L / min.

[0047] During actual cooling, when high-temperature cooling is performed, the large water pump impact valve 3-4 in the fast-flow water circuit unit 3 switches to the high-temperature cooling branch 3-4-2. High-temperature cooling water in the high-temperature water tank 1 is drawn by the fast-flow water pump and flows sequentially through the large flow meter 3-3, the high-temperature heat exchanger 3-5, and the cooling unit 5, providing high-temperature cooling to the EGR cooling device 6 in the cooling unit 5. Simultaneously, the small water pump impact valve 4-5 in the slow-flow water circuit unit 4 switches to the low-temperature reflux branch 4-5-1. Low-temperature cooling water in the low-temperature water tank 2 is drawn by the small water pump and flows sequentially through the low-temperature two-way ball valve 4-1, the small flow meter 4-3, the small water pump impact switch valve 4-4, the small water pump impact valve 4-5, the low-temperature reflux branch 4-5-1, and the reflux temperature control module 7. After being cooled by the reflux temperature control module 7, it flows back to the low-temperature water tank 2, achieving low-temperature circulation and effectively preventing the low-temperature cooling water from heating up during storage.

[0048] When performing low-temperature cooling, the large water pump impact valve 3-4 in the fast-flow water circuit unit 3 switches to the high-temperature return branch 3-4-1. High-temperature cooling water in the high-temperature water tank 1 is drawn by the fast-flow water pump and flows sequentially through the large flow meter 3-3, the high-temperature heat exchanger 3-5, the large water pump impact valve 3-4, and the high-temperature return branch 3-4-1, before returning to the high-temperature water tank 1 via the high-temperature return branch 3-4-1, thus achieving high-temperature cooling water circulation. Simultaneously, the small water pump impact valve 4-5 in the slow-flow water circuit unit 4 switches to the low-temperature cooling branch 4-5-2. Low-temperature cooling water in the low-temperature water tank 2 is drawn by the small water pump and flows sequentially through the low-temperature two-way ball valve 4-1, the small flow meter 4-3, the small water pump impact switch valve 4-4, the small water pump impact valve 4-5, and the cooling unit 5, providing low-temperature cooling to the EGR cooling device 6 in the cooling unit 5.

[0049] Furthermore, a heater 8 is provided on the high-temperature return branch 3-4-1 to heat up the high-temperature cooling water returning to the high temperature, so that the high-temperature cooling water in the high-temperature water tank 1 always maintains the required temperature.

[0050] In this embodiment, the temperature of the cooling water in the high-temperature water tank 1 is approximately 90°C. The temperature of the cooling water in the low-temperature water tank 2 is approximately 40°C.

[0051] Furthermore, a normal on / off unit 9 is provided between the output ends of the high-temperature water tank 1 and the low-temperature water tank 2. When both the high-temperature two-way ball valve 3-2 and the low-temperature two-way ball valve 4-1 are in the off state, the normal on / off unit 9 can output the cooling water in the high-temperature water tank 1 to the high-temperature heat exchanger side through the slow-transport water circuit unit 4 to achieve normalized high-temperature slow cooling.

[0052] In this embodiment, the normal on / off unit 9 includes a two-way ball valve 9-1, a small water pump inlet valve 9-2, and a water pump switching valve 9-3. The two-way ball valve 9-1 and the small water pump inlet valve 9-2 are connected in series and positioned between the high-temperature water tank 1 and the low-temperature water tank 2, used to switch the output water path of the high-temperature cooling water in the high-temperature water tank 1 from the fast-flow water path unit 3 to the slow-flow water path unit 4. The water pump switching valve 9-3 is positioned between the large flow meter 3-3 and the high-temperature heat exchanger 3-5, used to switch the connection between the fast-flow water pump and the high-temperature heat exchanger 3-5 or between the small water pump and the high-temperature heat exchanger 3-5.

[0053] Specifically, the inlet of the switching two-way ball valve 9-1 is connected to the output of the high-temperature water tank 1. The small water pump inlet valve 9-2 is located between the low-temperature two-way ball valve 4-1 and the slow-release water pump. Both the small water pump inlet valve 9-2 and the water pump switching valve 9-3 are three-way ball valves. The three ports of the small water pump inlet valve 9-2 are, in sequence, the high-temperature slow-release inlet 9-2-1, the low-temperature slow-release inlet 9-2-2, and the cooling water outlet. The high-temperature slow-release inlet 9-2-1 is connected to the switching two-way ball valve 9-1; the low-temperature slow-release inlet 9-2-2 is connected to the low-temperature two-way ball valve 4-1; and the cooling water outlet is connected to the slow-release water pump.

[0054] The three valve ports of the water pump switching valve 9-3 are, in sequence, an alternating input port 9-3-1, a normal input port 9-3-2, and a drain port. Among them, the alternating input port 9-3-1 is connected to the large flow meter 3-3; the normal input port 9-3-2 is connected to the small flow meter 4-3; and the drain port is connected to the input end of the high-temperature heat exchanger 3-5.

[0055] During actual cooling, when performing normal high-temperature cooling, the operator closes the high-temperature two-way ball valve 3-2, the low-temperature two-way ball valve 4-1, and the small water pump impact switch valve 4-4. Simultaneously, the small water pump inlet valve 9-2 is switched to a state where the high-temperature slow-flow inlet 9-2-1 is connected to the cooling water outlet; the water pump switching valve 9-3 is switched to a state where the normal inlet 9-3-2 is connected to the drain outlet. The high-temperature cooling water in the high-temperature water tank 1 is drawn by the slow-flow water pump and flows sequentially through the switching two-way ball valve 9-1, the small water pump inlet valve 9-2, the slow-flow water pump, the small flow meter 4-3, the water pump switching valve 9-3, and the high-temperature heat exchanger 3-5. After temperature control by the high-temperature heat exchanger 3-5, it flows into the cooling unit 5, achieving normal, slow, high-temperature cooling of the EGR cooling device 6.

[0056] like Figure 1 and 3 As shown, the cooling unit 5 includes a cooling inlet pipe 5-1, a cooling return pipe 5-2, and two cooling two-way ball valves. The input end of the cooling inlet pipe 5-1 is connected to the output end of the fast-flow water circuit unit 3 and the output end of the slow-flow water circuit unit 4; the cooling return pipe 5-2 is connected to the return flow temperature control module 7. The two cooling two-way ball valves are connected in series with the cooling inlet pipe 5-1 and the cooling return pipe 5-2, respectively, to shut off the inlets of the cooling inlet pipe 5-1 and the cooling return pipe 5-2 when replacing the EGR device under test, thus preventing leakage.

[0057] like Figure 1As shown, the reflux temperature control module 7 includes a reflux switching valve 7-1, a large plate heat exchanger 7-2, a small plate heat exchanger 7-3, and a cooling control assembly. The reflux switching valve 7-1 has three ports: a reflux inlet 7-1-1, a high-temperature reflux inlet 7-1-2, and a low-temperature reflux inlet 7-1-3. The output end of the cooling reflux pipe 5-2 is connected to the reflux inlet 7-1-1. The two ends of the large plate heat exchanger 7-2 are connected to the high-temperature reflux inlet 7-1-2 and the high-temperature reflux branch 3-4-1, respectively.

[0058] The low-temperature reflux branch 4-5-1 of the small water pump impact valve 4-5 and the low-temperature reflux port 7-1-3 on the reflux switching valve 7-1 are both connected to the input end of the small plate heat exchanger 7-3, and the output end is connected to the low-temperature water tank 2. The cooling control assembly is used to cool the cooling water flowing through the large plate heat exchanger 7-2 or the small plate heat exchanger 7-3.

[0059] During actual cooling, when the system is undergoing high-temperature cooling, the reflux switching valve 7-1 switches to a state where the reflux inlet 7-1-1 and the high-temperature reflux outlet 7-1-2 are connected. The high-temperature cooling water, after being heated by the EGR cooling device 6, is cooled by the cooling control components on the large plate heat exchanger 7-2 and then flows back to the high-temperature water tank 1. Simultaneously, the low-temperature cooling water in the low-temperature water tank 2 is drawn by a slow-flow pump, flows through the small pump impact valve 4-5 and the small plate heat exchanger 7-3, and then flows back to the low-temperature water tank 2, forming a circulation. The small plate heat exchanger 7-3 cools the low-temperature cooling water as it flows through, preventing the low-temperature cooling water from heating up during water circulation.

[0060] When the system is undergoing cryogenic cooling, the reflux switching valve 7-1 switches to a state where the reflux inlet 7-1-1 and the cryogenic reflux outlet 7-1-3 are connected. Simultaneously, the small water pump impact valve 4-5 switches to a state where the small water pump impact switch valve 4-4 and the cryogenic cooling branch 4-5-2 are connected. The cryogenic cooling water in the cryogenic water tank 2 is drawn by the slow-flow water pump and flows sequentially through the small water pump impact valve 4-5, cooling unit 5, reflux switching valve 7-1, and small plate heat exchanger 7-3. After being cooled by the small plate heat exchanger 7-3, it flows back to the cryogenic water tank 2.

[0061] In this embodiment, a small water pump backup valve is provided on the low-temperature reflux port 7-1-3 of the reflux switching valve 7-1; a large water pump backup valve is provided on the output end of the large plate heat exchanger 7-2. The small water pump backup valve and the large water pump backup valve are used to ensure the stability of the water pressure in the pipeline when the high-temperature cooling water and the low-temperature cooling water are refluxed.

[0062] Furthermore, the cooling control assembly includes a high-temperature cooling pipe 7-4 and a low-temperature cooling pipe 7-5 connected in parallel. The input ends of both the high-temperature cooling pipe 7-4 and the low-temperature cooling pipe 7-5 are connected to an external cooling tower, and their output ends return to the external cooling tower. A small plate heat exchanger 7-3 and a large plate heat exchanger 7-2 are connected in series in the low-temperature cooling pipe 7-5 and the high-temperature cooling pipe 7-4, respectively. Cooling water is continuously supplied to the small plate heat exchanger 7-3 and the large plate heat exchanger 7-2 through the cooling tower, thereby achieving cooling of the high and low temperature cooling water flowing through the small plate heat exchanger 7-3 or the large plate heat exchanger 7-2.

[0063] Furthermore, a cooling water regulating valve 7-6 is connected in series on the high-temperature cooling pipe 7-4. The cooling water regulating valve 7-6 is a three-way proportional valve. The three valve ports of the cooling water regulating valve 7-6 are the high-temperature cooling inlet, the high-temperature cooling outlet, and the diversion outlet. The high-temperature cooling inlet and the high-temperature cooling outlet are connected to the output end of the external cooling tower and the input end of the large plate heat exchanger 7-2, respectively. The diversion outlet is connected to the input end of the external cooling tower.

[0064] In the actual cooling process, the staff adjusts the size of the high-temperature cooling outlet and the diversion outlet in the cooling water control valve 7-6, thereby controlling the flow rate of the cooling water from the external cooling tower to the large plate heat exchanger 7-2, and achieving precise temperature control and cooling of the high-temperature coolant.

[0065] In some embodiments, temperature sensors are provided on the high-temperature water tank 1, the low-temperature water tank 2, the cooling return pipe 5-2 of the cooling unit 5, the output end of the large plate heat exchanger 7-2, and the output end of the small plate heat exchanger 7-3, so that the staff can monitor the cooling water temperature at various points in the system in real time.

[0066] This invention provides a cooling method for a high and low temperature water-cooled alternating cooling system, comprising the following steps:

[0067] S1, Equipment installation: Install the EGR cooling device 6 in the cooling unit 5, with its two ends connected to the cooling inlet pipe 5-1 and the cooling return pipe 5-2 in the cooling unit 5, respectively.

[0068] S2, High-Temperature Cooling: The large water pump impact valve 3-4 in the fast-flow water circuit unit 3 is switched to the high-temperature cooling branch 3-4-2. The small water pump impact valve 4-5 in the slow-flow water circuit unit 4 is switched to the low-temperature reflux branch 4-5-1. The high-temperature cooling water in the high-temperature water tank 1 is drawn by the fast-flow water pump and flows sequentially through the large flow meter 3-3, the high-temperature heat exchanger 3-5, and the cooling unit 5 to perform high-temperature cooling on the EGR cooling device 6 in the cooling unit 5. After cooling, the high-temperature cooling water is returned to the high-temperature water tank 1 after temperature control by the reflux temperature control module 7, and circulates for a total cycle time of 1 minute.

[0069] Meanwhile, the low-temperature cooling water in the low-temperature water tank 2 is drawn by the slow-flow water pump and flows sequentially through the low-temperature two-way ball valve 4-1, the small flow meter 4-3, the small water pump impact switch valve 4-4, the small water pump impact valve 4-5, the low-temperature return branch 4-5-1, and the return temperature control module 7. After being cooled down by the return temperature control module 7, it flows back to the low-temperature water tank 2.

[0070] S3, Low-Temperature Cooling: The large water pump impact valve 3-4 in the fast-flow water circuit unit 3 is switched to the high-temperature return branch 3-4-1; the small water pump impact valve 4-5 in the slow-flow water circuit unit 4 is switched to the low-temperature cooling branch 4-5-2. The low-temperature cooling water in the low-temperature water tank 2 is drawn by the slow-flow water pump and flows sequentially through the low-temperature two-way ball valve 4-1, the small flow meter 4-3, the small water pump impact switch valve 4-4, the small water pump impact valve 4-5, and the cooling unit 5, providing low-temperature cooling to the EGR cooling device 6 in the cooling unit 5. After cooling, the low-temperature cooling water is returned to the low-temperature water tank 2 after temperature control by the return flow temperature control module 7, and circulates for a total cycle time of 1 minute.

[0071] Meanwhile, the high-temperature cooling water in the high-temperature water tank 1 is drawn by the fast water pump and flows sequentially through the large flow meter 3-3, the high-temperature heat exchanger 3-5, the large water pump impact valve 3-4 and the high-temperature return branch 3-4-1. After being heated by the heater 8 in the high-temperature return branch 3-4-1, it flows back to the high-temperature water tank 1, thus realizing the circulation of high-temperature cooling water.

[0072] S4, cyclical alternating cooling, alternately executing steps S2 and S3, cycle 5000 times, to achieve high and low temperature water cooling alternating switching cooling for EGR cooling device 6.

[0073] S5, Data Analysis: Record the temperature displayed by the temperature sensor at the cooling return pipe 5-2 in cooling unit 5 during each thermal shock cycle test. Based on the monitored temperature data, the staff evaluates the heat exchange efficiency of the EGR cooling unit and the stability of the system temperature control.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high and low temperature water-cooled alternating switching cooling system, characterized in that: It includes a high-temperature water tank (1), a low-temperature water tank (2), a fast water conveyance unit (3), a slow water conveyance unit (4), a cooling unit (5), and a reflux temperature control module (7); the high-temperature water tank (1) and the low-temperature water tank (2) are respectively connected to the fast water conveyance unit (3) and the slow water conveyance unit (4); The end of the fast water conveyance unit (3) is provided with a high-temperature reflux branch (3-4-1) and a high-temperature cooling branch (3-4-2) that can be switched between each other; the high-temperature reflux branch (3-4-1) is connected to the high-temperature water tank (1); the high-temperature cooling branch (3-4-2) is connected to the input end of the cooling unit (5); The end of the slow-flow water circuit unit (4) is provided with a low-temperature reflux branch (4-5-1) and a low-temperature cooling branch (4-5-2) that can be switched between each other; the low-temperature cooling branch (4-5-2) is connected to the high-temperature cooling branch (3-4-2) and both lead to the input end of the cooling unit (5); the low-temperature cooling branch (4-5-2) and the high-temperature cooling branch (3-4-2) are alternately started and stopped; the low-temperature reflux branch (4-5-1) is connected to the reflux temperature control module (7); An EGR cooling device (6) is connected in series inside the cooling unit (5); the EGR cooling device (6) is cooled by alternating high and low temperature cooling water flowing through the cooling unit (5); The reflux temperature control module (7) is used to cool the cooling water flowing through the EGR cooling device (6) and return it to the corresponding high-temperature water tank (1) or low-temperature water tank (2). The fast water conveyance unit (3) includes a fast water pump (3-1), a high-temperature two-way ball valve (3-2), a large flow meter (3-3), a cooling temperature control component, and a large water pump impact valve (3-4) arranged in series. The fast water pump (3-1) is used to draw cooling water from the high-temperature water tank (1). The large flow meter (3-3) is used to measure the flow rate of the high-temperature cooling water drawn by the fast water pump (3-1). The output end of the cooling temperature control component is connected to the large water pump impact valve (3-4) and is used to cool the high-temperature cooling water output from the high-temperature water tank (1). The high-temperature return branch (3-4-1) and the high-temperature cooling branch (3-4-2) are set on the large water pump impact valve (3-4). The cooling and temperature control assembly includes a high-temperature heat exchanger (3-5) and a temperature sensor; wherein, the high-temperature heat exchanger (3-5) is provided with a cooling pipe and a liquid delivery pipe for heat exchange; the two ends of the cooling pipe are respectively connected to a coolant inlet pipe and a coolant outlet pipe; the two ends of the liquid delivery pipe are respectively connected to a large flow meter (3-3) and a large water pump impact valve (3-4); the temperature sensor is set at the outlet of the liquid delivery pipe.

2. The high and low temperature water-cooled alternating switching cooling system according to claim 1, characterized in that: The slow-flow water circuit unit (4) includes a low-temperature two-way ball valve (4-1), a slow-flow water pump (4-2), a small flow meter (4-3), a small water pump impact switch valve (4-4), and a small water pump impact valve (4-5) arranged in series. The low-temperature two-way ball valve (4-1) is used to control the opening or closing of the water circuit when the slow-flow water pump (4-2) draws low-temperature cooling water from the low-temperature water tank (2). The small flow meter (4-3) is used to measure the flow rate of the low-temperature cooling water drawn by the slow-flow water pump (4-2). The small water pump impact switch valve (4-4) is used to control the opening or closing of the water circuit from the low-temperature cooling water to the small water pump impact valve (4-5). The low-temperature return branch (4-5-1) and the low-temperature cooling branch (4-5-2) are arranged on the small water pump impact valve (4-5).

3. The high and low temperature water-cooled alternating switching cooling system according to claim 1, characterized in that: A heater (8) is provided on the high-temperature reflux branch (3-4-1).

4. The high and low temperature water-cooled alternating switching cooling system according to claim 2, characterized in that: A normal on / off unit (9) is provided between the output ends of the high temperature water tank (1) and the low temperature water tank (2); the normal on / off unit (9) can output the cooling water in the high temperature water tank (1) to the high temperature heat exchanger (3-5) through the slow-transport water circuit unit (4) when both the high temperature two-way ball valve (3-2) and the low temperature two-way ball valve (4-1) are in the off state.

5. The high and low temperature water-cooled alternating switching cooling system according to claim 4, characterized in that: The normal on / off unit (9) includes a two-way ball valve (9-1), a small water pump inlet valve (9-2), and a water pump switching valve (9-3). The two-way ball valve (9-1) and the small water pump inlet valve (9-2) are connected in series and are located between the high-temperature water tank (1) and the low-temperature water tank (2) to switch the output water path of the high-temperature cooling water in the high-temperature water tank (1) from the fast water path unit (3) to the slow water path unit (4). The water pump switching valve (9-3) is located between the large flow meter (3-3) and the high-temperature heat exchanger (3-5) to realize the switching and conduction between the fast water pump and the high-temperature heat exchanger (3-5) or the slow water pump and the high-temperature heat exchanger (3-5).

6. The high and low temperature water-cooled alternating switching cooling system according to claim 1, characterized in that: The cooling unit (5) includes a cooling inlet pipe (5-1), a cooling return pipe (5-2), and two cooling two-way ball valves; the input end of the cooling inlet pipe (5-1) is connected to the output end of the fast water supply unit (3) and the output end of the slow water supply unit (4); the cooling return pipe (5-2) is connected to the return temperature control module (7); the two cooling two-way ball valves are connected in series with the cooling inlet pipe (5-1) and the cooling return pipe (5-2), respectively.

7. The high and low temperature water-cooled alternating switching cooling system according to claim 2, characterized in that: The reflux temperature control module (7) includes a reflux switching valve (7-1), a large plate heat exchanger (7-2), a small plate heat exchanger (7-3), and a cooling control component; the three ports of the reflux switching valve (7-1) are a reflux inlet (7-1-1), a high-temperature reflux inlet (7-1-2), and a low-temperature reflux inlet (7-1-3); the output end of the cooling unit (5) is connected to the reflux inlet (7-1-1); the two ends of the large plate heat exchanger (7-2) are respectively connected to the high-temperature reflux inlet. The outlet (7-1-2) is connected to the high-temperature reflux branch (3-4-1); the low-temperature reflux branch (4-5-1) of the small water pump impact valve (4-5) and the low-temperature reflux outlet (7-1-3) on the reflux switching valve (7-1) are both connected to the input end of the small plate heat exchanger (7-3), and the output end is connected to the low-temperature water tank (2); the cooling control component is used to cool the cooling water flowing through the large plate heat exchanger (7-2) or the small plate heat exchanger (7-3).

8. The cooling method of a high and low temperature water-cooled alternating switching cooling system according to claim 2, characterized in that: Includes the following steps: S1, Equipment installation: Install the EGR cooling device (6) in the cooling unit (5); S2, high temperature cooling, switch the large water pump impact valve (3-4) in the fast water conveyance unit (3) to the high temperature cooling branch (3-4-2); switch the small water pump impact valve (4-5) in the slow water conveyance unit (4) to the low temperature return branch (4-5-1); the high temperature cooling water in the high temperature water tank (1) is drawn by the fast water pump to perform high temperature cooling on the EGR cooling device (6) in the cooling unit (5); the high temperature cooling water that has completed cooling is returned to the high temperature water tank (1) after being controlled by the return temperature control module (7), and circulates, with the entire circulation set for the duration; S3, low temperature cooling, switch the large water pump impact valve (3-4) in the fast water conveyance unit (3) to the high temperature return branch (3-4-1); switch the small water pump impact valve (4-5) in the slow water conveyance unit (4) to the low temperature cooling branch (4-5-2); the low temperature cooling water in the low temperature water tank (2) is drawn by the slow water conveyance pump to perform low temperature cooling on the EGR cooling device (6) in the cooling unit (5); the low temperature cooling water that has completed the cooling operation is returned to the low temperature water tank (2) after being controlled by the return temperature control module (7) and circulated, and the entire circulation is set for a set time; S4, cyclical alternating cooling, alternately executing steps S2 and S3, repeating multiple times to achieve high and low temperature water cooling alternating switching cooling of EGR cooling device (6); S5, Data Analysis: Record the temperature displayed by the temperature sensor at the cooling return pipe (5-2) in the cooling unit (5) during each thermal shock cycle test; Based on the monitored temperature data, evaluate the heat exchange efficiency of the EGR cooling device and the stability of the system temperature control.

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