Integrated expansion tank for thermal management system and internal combustion power pack thermal management system

Abstract

The present invention discloses an integrated expansion water tank for a thermal management system and an internal combustion power pack thermal management system. The integrated expansion water tank includes an expansion water tank body and a first partition, a second partition, a third partition, a fourth partition, a float liquid level switch, a pressure relief valve, a liquid level gauge, a water supply pipe and an overflow pipe; the first partition and the second partition divide the interior of the expansion water tank body into a high-temperature water chamber, a buffer chamber and a low-temperature water chamber, and the high-temperature water chamber, the buffer chamber and the low-temperature water chamber are connected at the top and at the bottom through a connecting hole; pipe seats for the water supply pipe are respectively provided on both sides of the expansion water tank body. The integrated expansion water tank realizes the liquid complementation of high-temperature water and low-temperature water in the thermal management system, effectively reducing the probability of failure due to insufficient liquid in the expansion water tank and alarm during train operation; the internal combustion power pack thermal management system realizes the scientific and effective management and recycling of the heat of the internal combustion power system.

Description

Technical Field

[0001] The present invention relates to a thermal management system for internal combustion power, hybrid power locomotives and EMUs, and in particular to an integrated expansion water tank for the thermal management system and an internal combustion power pack thermal management system. Background Art

[0002] With the development of the rail transit industry, the functional requirements of thermal management systems are increasing, and the structure is becoming more complex. With low-carbon technology research as the top-level guidance, the rail transit industry has put forward higher environmental protection and energy-saving requirements for vehicle thermal management.

[0003] The expansion water tank has the functions of providing volume change compensation space for the cooling water of the thermal management system, regulating the system pressure, providing an exhaust channel for the system and replenishing the cooling water consumption. It is an important component of the thermal management system and plays a vital role in the reliable operation of the thermal management system.

[0004] The existing patent with application number 201710839109.8 discloses a new energy vehicle dual-system shared expansion water tank, including an expansion water tank and a partition. Degassing ports are respectively provided on the upper parts of both sides of the expansion water tank, and return water ports are respectively provided on the bottom parts of both sides of the expansion water tank. The partition is a heat-insulating insulation layer. The partition is vertically arranged and divides the interior of the expansion water tank into a high-temperature water chamber and a low-temperature water chamber. The upper parts of the high-temperature water chamber and the low-temperature water chamber are connected and separated at the lower parts. A coolant filling port is provided on the top cover of the low-temperature water chamber, and a liquid level indicator window is provided on the side of the high-temperature water chamber.

[0005] Patent application number 202020716671.9 discloses a vehicle expansion tank and a vehicle, wherein the vehicle expansion tank comprises a tank body and a filling structure. The tank body has multiple independent liquid storage spaces, each of which is connected to a different liquid cooling circuit in the vehicle; at least a portion of the filling structure is disposed within the tank body and is capable of simultaneously filling the multiple liquid storage spaces with coolant.

[0006] The existing locomotive thermal management systems are all high-temperature thermal management systems and low-temperature thermal management systems, each with an independent expansion water tank, and the structure is not compact; the float of the float level switch in each expansion water tank is in the same chamber as the exhaust pipe seat connecting hole and the water supply pipe seat connecting hole. The water supply and exhaust process affects the stability of the float, which may lead to the issuance of erroneous liquid level alarm signals and affect the safe and punctual operation of the train.

[0007] It can be seen from the comparison of patents 201710839109.8 and 202020716671.9 that in both applications, the expansion tanks of the two systems are physically installed together. During operation, the liquids in each chamber of the expansion tank work independently. It is possible that during use, the liquid level in a certain chamber drops below the minimum liquid level, and the coolant in the other chamber cannot replenish the liquid in the low-level chamber even if it exceeds the maximum liquid level. Summary of the Invention

[0008] In response to the problem that the liquids in each chamber inside the existing expansion water tank work independently and are easily alarmed due to insufficient liquid in the water tank, the present invention provides an integrated expansion water tank and an internal combustion power pack thermal management system for a thermal management system. The integrated expansion water tank adopts a three-chamber five-room structure, which can achieve liquid complementarity between high-temperature water and low-temperature water in the thermal management system under specific circumstances, effectively reducing the probability of failure to alarm due to insufficient liquid in the expansion water tank during train operation, thereby further reducing train operation and maintenance costs, and being safe and reliable; the system design scheme of high-temperature water temperature control valve, low-temperature water temperature control valve and parallel pipeline for the internal combustion power pack thermal management system realizes three different thermal management circulation modes of the internal combustion power pack thermal management system pipeline by intelligently controlling the opening and closing of the high-temperature water temperature control valve and the low-temperature water temperature control valve according to the operating conditions of the rail transit equipment, thereby realizing scientific and effective management and recycling of heat from the internal combustion power system diesel engine, supercharger, auxiliary generator, hydraulic transmission box and hydraulic drive system, and achieving energy saving and low carbon.

[0009] In order to achieve the above-mentioned object, the technical solution of the present invention is: an integrated expansion water tank for a thermal management system, comprising an expansion water tank body, a first baffle, a second baffle, a third baffle, a fourth baffle, a float liquid level switch, a pressure relief valve, a liquid level gauge, a water supply pipe, an exhaust pipe seat and an overflow pipe;

[0010] The first baffle and the second baffle are both vertically arranged inside the expansion water tank body, dividing the internal space of the expansion water tank body into a high-temperature water chamber, a buffer chamber and a low-temperature water chamber, the buffer chamber is located between the high-temperature water chamber and the low-temperature water chamber, and the high-temperature water chamber, the buffer chamber and the low-temperature water chamber are connected at the top;

[0011] The third partition is vertically arranged inside the high-temperature water chamber to separate the high-temperature water chamber into a high-temperature liquid storage main chamber and a high-temperature liquid storage sub-chamber, wherein the upper parts of the high-temperature liquid storage main chamber and the high-temperature liquid storage sub-chamber are connected to each other and separated by the lower part;

[0012] The fourth partition is vertically arranged inside the low-temperature water chamber to separate the low-temperature water chamber into a low-temperature liquid storage main chamber and a low-temperature liquid storage sub-chamber, wherein the upper parts of the low-temperature liquid storage main chamber and the low-temperature liquid storage sub-chamber are connected and separated by the lower parts;

[0013] A communication hole is provided on the lower portion of the first partition plate and the lower portion of the second partition plate on a side close to the bottom wall of the expansion water tank body, the communication hole on the first partition plate connects the buffer chamber with the high-temperature liquid storage main chamber, and the communication hole on the second partition plate connects the buffer chamber with the low-temperature liquid storage main chamber;

[0014] There are two groups of water supply pipes, which are respectively arranged at the lower part of the two side walls of the expansion water tank body, wherein the water supply pipe on one side is connected to the high-temperature liquid storage main cavity of the high-temperature water chamber, and the water supply pipe on the other side is connected to the low-temperature liquid storage main cavity of the low-temperature water chamber;

[0015] There are two groups of exhaust pipe sockets, which are respectively arranged at the lower part of the two side walls of the expansion water tank body, wherein the exhaust pipe sockets on one side are connected to the high-temperature liquid storage sub-cavity of the high-temperature water chamber, and the exhaust pipe sockets on the other side are connected to the low-temperature liquid storage sub-cavity of the low-temperature water chamber;

[0016] The liquid inlet of the overflow pipe is arranged inside the buffer chamber, and the liquid outlet of the overflow pipe extends to the outside of the expansion water tank body and communicates with the external environment; the liquid inlet of the overflow pipe is higher than the liquid outlet of the overflow pipe.

[0017] Furthermore, the height of the liquid inlet of the overflow pipe is higher than the height of the highest liquid level in the expansion water tank body. When the liquid level in the buffer chamber is higher than the highest overflow liquid level, the liquid will overflow from the overflow pipe.

[0018] Furthermore, the float liquid level switch comprises a first float and a second float, the first float and the second float are both arranged in the buffer chamber, and the installation height of the second float is lower than the installation height of the first float.

[0019] Furthermore, when the liquid level in the buffer chamber is lower than the lowest scale of the liquid level gauge, the second float of the float liquid level switch can output an electric shock switch signal to provide a warning signal;

[0020] When the liquid level in the buffer chamber is lower than a certain proportion of the lowest scale of the liquid level gauge, the first float of the float liquid level switch can output an electric shock switch signal, and the main power signal is disconnected.

[0021] Furthermore, the height of the inner cavity of the expansion water tank body is H6; the height of the first partition and the second partition from the bottom wall of the expansion water tank body is H5; the height of the liquid inlet of the overflow pipe from the bottom wall of the expansion water tank body is H4; the height of the highest liquid level line of the liquid level gauge from the bottom wall of the expansion water tank body is H3, and the height of the lowest liquid level line of the liquid level gauge from the bottom wall of the expansion water tank body is H2; the height of the third partition and the fourth partition from the inner wall of the bottom plate of the expansion water tank body is H1; the height of the center line of the second float from the bottom wall of the expansion water tank body is H7; the height of the center line of the first float from the inner wall of the bottom plate of the expansion water tank body is H8, H6>H5>H4>H3>H2>H1, and H8<H2.

[0022] Furthermore, the two-way pressure valve is arranged on the top wall or side wall of the expansion water tank body. When the two-way pressure valve is arranged on the side wall of the expansion water tank body, the height of the lowest point of the two-way pressure valve mounting hole on the side wall of the expansion water tank body corresponding to the inner wall of the bottom plate of the expansion water tank body should be greater than H4.

[0023] Since the working pressure in the water circulation system changes with the external temperature, altitude, etc. when the train is running, the pressure relief valve of the expansion water tank is constantly opening and closing, realizing continuous exchange between the internal and external environment. As the running time increases, the internal liquid level will continue to drop; in addition, local leakage failures in pipeline connections, radiators and other parts will also cause the liquid level to continue to drop, resulting in an alarm due to insufficient liquid in the expansion water tank during train operation.

[0024] Furthermore, the end of the water supply pipe located in the high-temperature liquid storage main cavity is configured as an oblique section, and the angle between the oblique section and the bottom wall of the expansion water tank body is between 5° and 90°;

[0025] The end of the water supply pipe located in the low-temperature liquid storage main cavity is configured as an oblique section, and the angle between the oblique section and the bottom plate of the expansion water tank body is between 5° and 90°.

[0026] An internal combustion power pack thermal management system, comprising a high-temperature water thermal management system and a low-temperature water thermal management system; the high-temperature water thermal management system, the low-temperature water thermal management system, an integrated expansion water tank, a fan assembly and a hydraulic drive system;

[0027] The high-temperature water thermal management system includes a high-temperature main circulation loop consisting of a high-temperature water pump, a diesel engine, a high-temperature water temperature control valve, a high-temperature water radiator group, a transmission oil heat exchanger and a high-temperature water pipeline, and a high-temperature expansion loop consisting of the integrated expansion water tank, a high-temperature water pump water supply pipe and several high-temperature exhaust pipes;

[0028] One end of the high-temperature water pump feed pipe is connected to the high-temperature water pump inlet pipe, and the other end is connected to the feed pipe socket; the multiple high-temperature exhaust pipes include exhaust pipe 1 for connecting to the transmission oil heat exchanger, exhaust pipe 2 for connecting to the diesel engine, and exhaust pipe 3 for connecting to the high-temperature water radiator group. The other ends of exhaust pipe 1, exhaust pipe 2, and exhaust pipe 3 are connected to the exhaust pipe socket of the integrated expansion water tank after being combined. The exhaust pipe socket is connected to the high-temperature liquid storage sub-chamber of the high-temperature water chamber;

[0029] The low-temperature water thermal management system includes a low-temperature main circulation loop composed of a low-temperature water pump, a water-to-air intercooler, an auxiliary generator, a hydraulic oil heat exchanger, a low-temperature water temperature control valve, a low-temperature water radiator group and a low-temperature water pipeline, and a low-temperature expansion loop composed of the integrated expansion water tank, a low-temperature water pump water supply pipe, and a plurality of low-temperature exhaust pipes; one end of the low-temperature water pump water supply pipe is connected to the low-temperature water pump inlet pipeline, and the other end is connected to the integrated expansion water tank water supply pipe seat, and the water supply pipe is connected to the low-temperature liquid storage main cavity of the low-temperature water chamber; the plurality of low-temperature exhaust pipes include an exhaust pipe fourth for connecting to the low-temperature water radiator group, an exhaust pipe fifth for connecting to the hydraulic oil heat exchanger, and an exhaust pipe sixth for connecting to the water-to-air intercooler, the other ends of the exhaust pipe fourth, the exhaust pipe fifth, and the exhaust pipe sixth are connected to the exhaust pipe seat of the integrated expansion water tank after being collected, and the exhaust pipe seat is connected to the low-temperature liquid storage sub-cavity of the low-temperature water chamber;

[0030] The auxiliary generator and the water-to-air intercooler are arranged in parallel in the low-temperature main circulation loop;

[0031] The integrated expansion water tank, high-temperature water radiator group, low-temperature water radiator group, and fan assembly are all installed inside the frame to form a cooling device; the high-temperature water radiator group and low-temperature water radiator group are respectively arranged on both sides of the fan assembly.

[0032] Furthermore, the high-temperature water radiator group includes several high-temperature water radiators, and the several high-temperature water radiators are connected in series or in parallel; the high-temperature water radiator adopts an aluminum plate-fin structure radiator; the low-temperature water radiator group includes several low-temperature water radiators, and the several low-temperature water radiators are connected in series or in parallel.

[0033] Furthermore, the high-temperature water temperature control valve and the low-temperature water temperature control valve are three-way valves with adjustable openings. The high-temperature water thermal management system regulated by the high-temperature water temperature control valve is regulated by the following method:

[0034] When the outlet water temperature of the diesel engine in the high temperature water thermal management system is lower than the minimum set temperature T of the high temperature water temperature control valve G1When the high-temperature water flows through the high-temperature water temperature control valve, it does not pass through the high-temperature radiator group, and all flows directly to the transmission oil heat exchanger, and then flows back to the diesel engine after passing through the high-temperature water pump;

[0035] When the outlet water temperature of the diesel engine in the high temperature water thermal management system is higher than the maximum set temperature T of the high temperature water temperature control valve G2 When the high-temperature water flows through the high-temperature water temperature control valve, it all flows through the high-temperature radiator group, then flows to the transmission oil heat exchanger, and then flows back to the diesel engine after passing through the high-temperature water pump;

[0036] When the outlet water temperature of the diesel engine in the high temperature water thermal management system is greater than or equal to T G1 and ≤T G2 When the high-temperature water flows through the high-temperature water temperature control valve, part of it flows directly to the transmission oil heat exchanger inlet water pipe, and the other part flows to the high-temperature radiator group and then flows to the transmission oil heat exchanger inlet water pipe. The two parts of water flow merge and flow through the transmission oil heat exchanger, and then pass through the high-temperature water pump and flow back to the diesel engine.

[0037] The low-temperature water temperature control valve is used to control the water flow direction of the main circulation loop of the low-temperature water heat management system. The control method is as follows:

[0038] When the outlet water temperature of the water-to-air intercooler and the auxiliary generator in the low-temperature water thermal management system is lower than the minimum set temperature T of the low-temperature water temperature control valve D1 When the low-temperature water flows through the hydraulic oil heat exchanger, it all flows directly to the low-temperature water pump through the low-temperature water temperature control valve and returns to the water-to-air intercooler and the auxiliary generator;

[0039] When the outlet water temperature of the water-to-air intercooler and the auxiliary generator in the low-temperature water thermal management system is higher than the maximum set temperature T of the low-temperature water temperature control valve, D2 When the low-temperature water flows through the low-temperature water temperature control valve, it all flows through the low-temperature water radiator group, then flows to the low-temperature water pump, and then flows back to the water-to-air intercooler and the auxiliary generator;

[0040] When the outlet water temperature of the water-to-air intercooler and the auxiliary generator in the low-temperature water thermal management system is greater than or equal to T D1 and ≤T D2 When the low-temperature water flows through the hydraulic oil heat exchanger, part of it flows directly to the low-temperature water pump through the low-temperature water temperature control valve; the other part flows through the low-temperature water radiator group and then flows to the low-temperature water pump. The low-temperature water is merged in the low-temperature water pump and then flows back to the water-to-air intercooler and the auxiliary generator.

[0041] Furthermore, the high-temperature water radiator group is composed of several high-temperature water radiators connected in series or in parallel; the low-temperature water radiator group is composed of several low-temperature water radiators connected in series or in parallel.

[0042] Furthermore, the fan assembly includes a fan and an anti-cavitation hydraulic motor, and the anti-cavitation hydraulic motor drives the fan to rotate;

[0043] The internal combustion power pack thermal management system also includes a hydraulic drive system, which includes a hydraulic oil tank, a hydraulic pump, a fan control system, an oil suction filter, an oil return filter and a hydraulic oil pipeline. The oil in the hydraulic oil tank flows through the oil suction filter, the hydraulic pump, the anti-cavitation hydraulic motor, the hydraulic oil heat exchanger and then returns to the hydraulic oil tank through the hydraulic oil pipeline. The fan control system controls the speed of the anti-cavitation hydraulic motor according to the oil temperature, thereby controlling the speed of the fan.

[0044] In summary, the present invention has the following beneficial effects:

[0045] First, the thermal management system of the present application uses an integrated expansion water tank to separate the expansion water tank body into a high-temperature water chamber, a low-temperature water chamber and a buffer chamber through a first partition and a second partition, and the upper parts of the high-temperature water chamber, the buffer chamber and the low-temperature water chamber are connected; specially designed connecting holes are provided on the first partition and the second partition to connect the buffer chamber with the high-temperature water chamber and the low-temperature water chamber respectively, so as to achieve liquid level balance in the three chambers, avoid the water replenishment and exhaust process from affecting the stability of the float, and reduce the possibility of issuing an erroneous liquid level alarm signal. The third baffle divides the high-temperature water chamber into a main high-temperature liquid storage chamber and a secondary high-temperature liquid storage chamber. The upper portions of the high-temperature and secondary high-temperature liquid storage chambers extend through the lower compartment. The fourth baffle divides the low-temperature water chamber into a main low-temperature liquid storage chamber and a secondary low-temperature liquid storage chamber. These chambers form five water chambers: the main high-temperature liquid storage chamber, the secondary high-temperature liquid storage chamber, the buffer chamber, the main low-temperature liquid storage chamber, and the secondary low-temperature liquid storage chamber. This prevents exhaust gas from entering the thermal management system's water supply line. The integrated expansion water tank utilizes a three-chamber, five-chamber structure. When the operating pressure of the water circulation system fluctuates with ambient temperature, altitude, and other factors during train operation, the integrated expansion water tank ensures that high-temperature and low-temperature water are replenished under specific conditions. This effectively reduces the probability of failures caused by insufficient expansion water tank fluid during train operation, further reducing train operating and maintenance costs and ensuring safety and reliability.

[0046] Second, this application applies an integrated expansion water tank to the internal combustion power pack thermal management system, and adopts a system design scheme of high-temperature water temperature control valve, low-temperature water temperature control valve and parallel pipelines. By intelligently controlling the opening and closing of the high-temperature water temperature control valve and the low-temperature water temperature control valve according to the operating conditions of the rail transit equipment, three different thermal management circulation modes of the internal combustion power pack thermal management system pipeline are realized, and scientific and effective management and recycling of heat of the internal combustion power system diesel engine, supercharger, auxiliary generator, hydraulic transmission box and hydraulic drive system are realized, which saves energy and reduces carbon.

[0047] Third, compared with the prior art, in which high-temperature water radiators of the same group are arranged on both sides of the fan assembly, and high-temperature water radiators and low-temperature water radiators are arranged on the same side of the fan assembly, the present application arranges the high-temperature water radiator group and the low-temperature water radiator group on both sides of the fan assembly respectively, so that the radiators of the same group are located on the same side of the fan assembly. The arrangement shortens the pressure drop of the pipeline and reduces the flow resistance. In terms of maintenance, the radiators of the same group are located on the same side of the fan assembly. When a fan in the fan assembly needs to be repaired or replaced, the cooling effect on the remaining high and low temperature water can still be maintained, which is convenient for maintaining the stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0049] Figure 1 This is a schematic diagram of the overall structure of the integrated expansion water tank disclosed in Example 1 of the present invention;

[0050] Figure 2 This is a schematic diagram of the internal structure of the integrated expansion water tank disclosed in Example 1 of the present invention;

[0051] Figure 3 A partial cross-sectional view of the integrated expansion water tank disclosed in Example 1 of the present invention;

[0052] Figure 4 This is a general diagram of the internal combustion power pack thermal management system disclosed in Example 2 of the present invention;

[0053] Figure 5 This is a schematic diagram of a high-temperature water thermal management system in the internal combustion power pack thermal management system disclosed in Example 2 of the present invention;

[0054] Figure 6 This is a schematic diagram of a low-temperature water thermal management system in the internal combustion power pack thermal management system disclosed in Example 2 of the present invention;

[0055] Figure 7 This is a schematic diagram of the hydraulic drive system in the internal combustion power pack thermal management system disclosed in Example 2 of the present invention.

[0056] Figure: 1. Expansion tank body; 11. High-temperature water chamber; 111. High-temperature liquid storage main chamber; 112. High-temperature liquid storage auxiliary chamber; 12. Buffer chamber; 13. Low-temperature water chamber; 131. Low-temperature liquid storage main chamber; 132. Low-temperature liquid storage auxiliary chamber; 2. First partition; 21. Communication hole; 3. Second partition; 4. Third partition; 5. Fourth partition; 6. Float level switch; 61. First float; 62. Second float; 7. Pressure relief valve; 8. Liquid Level meter; 9. Water supply pipe; 10. Exhaust pipe socket; 20. Overflow pipe; 30. High-temperature water thermal management system; 301. High-temperature water pump; 302. Diesel engine; 303. High-temperature water temperature control valve; 304. High-temperature water radiator assembly; 305. Transmission oil heat exchanger; 3061. High-temperature pipeline A; 3062. High-temperature pipeline B; 3063. High-temperature pipeline C; 307. High-temperature water pump water supply pipe; 3081. Exhaust pipeline 1; 3082. Exhaust pipe Route 2; 3083, Exhaust Line 3; 309, Hydraulic Transmission Box; 40, Low-Temperature Water Thermal Management System; 401, Low-Temperature Water Pump; 402, Water-to-Air Intercooler; 403, Auxiliary Generator; 404, Hydraulic Oil Heat Exchanger; 405, Low-Temperature Water Temperature Control Valve; 406, Low-Temperature Water Radiator Assembly; 4071, Low-Temperature Pipe A; 4072, Low-Temperature Pipe B; 4073, Low-Temperature Pipe C; 408, Low-Temperature Water Pump Feed Pipe; 4091, Exhaust Pipe Route 4; 4092, exhaust line 5; 4093, exhaust line 6; 50, fan assembly; 501, fan; 502, anti-cavitation hydraulic motor; 60, hydraulic drive system; 601, hydraulic oil tank; 602, hydraulic pump; 603, fan control system; 604, oil suction filter; 605, return oil filter; 6061, hydraulic line A; 6062, hydraulic line B; 6063, hydraulic line C; 6064, hydraulic line D. DETAILED DESCRIPTION

[0057] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be combined with the appended drawings of the embodiments of the present invention. Figure 1-7 The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0058] Example 1

[0059] Combine Figure 1 and Figure 2An integrated expansion water tank for a thermal management system includes an expansion water tank body 1, a first partition 2, a second partition 3, a third partition 4, a fourth partition 5, a float liquid level switch 6, a pressure relief valve 7, a liquid level gauge 8, a water supply pipe 9, an exhaust pipe seat 10 and an overflow pipe 20.

[0060] Combine Figure 2 and Figure 3 The expansion tank body 1 is a box body, and the first partition plate 2 and the second partition plate 3 are both vertically arranged inside the expansion tank body 1, dividing the internal space of the expansion tank body 1 into a high-temperature water chamber 11, a buffer chamber 12 and a low-temperature water chamber 13. The buffer chamber 12 is located between the high-temperature water chamber 11 and the low-temperature water chamber 13, and the high-temperature water chamber 11, the buffer chamber 12 and the low-temperature water chamber 13 are connected at the top;

[0061] The third partition plate 4 is vertically arranged inside the high-temperature water chamber 11, dividing the high-temperature water chamber 11 into a high-temperature liquid storage main chamber 111 and a high-temperature liquid storage sub-chamber 112. The upper parts of the high-temperature liquid storage main chamber 111 and the high-temperature liquid storage sub-chamber 112 are connected to each other and separated from each other at the lower part;

[0062] The fourth partition plate 5 is vertically arranged inside the low-temperature water chamber 13, dividing the low-temperature water chamber into a low-temperature liquid storage main chamber 131 and a low-temperature liquid storage sub-chamber 132. The upper parts of the low-temperature liquid storage main chamber 131 and the low-temperature liquid storage sub-chamber 132 are connected to each other and separated at the lower part; the high-temperature liquid storage sub-chamber 112, the high-temperature liquid storage main chamber 111, the buffer chamber 12, the low-temperature liquid storage main chamber 131 and the low-temperature liquid storage sub-chamber 132 are sequentially arranged along the length direction of the expansion water tank body 1.

[0063] A connecting hole 21 is provided on the lower portion of the first baffle 2 and the lower portion of the second baffle 3, near the bottom wall of the expansion tank body 1. The connecting hole 21 on the first baffle 2 connects the buffer chamber 12 with the high-temperature liquid storage main chamber 111, while the connecting hole 21 on the second baffle 3 connects the buffer chamber 12 with the low-temperature liquid storage main chamber 131, thereby achieving liquid level balance within the chambers. The size of the connecting hole 21 is determined by matching calculations based on the flow resistance characteristics of the high-temperature water pump 301, the flow resistance characteristics of the low-temperature water pump 401, the high-temperature water pipeline loop resistance characteristics, and the low-temperature water pipeline loop resistance characteristics. When the pressures at the inlet of the high-temperature water circuit exhaust pipe socket and the inlet of the low-temperature water circuit exhaust pipe socket on the expansion tank are equal, the pressures in the expansion branches of the high-temperature and low-temperature water thermal management systems are balanced, and the high-temperature and low-temperature water coolants are barely affected by the presence of the connecting hole 21.

[0064] Neither the third partition 4 nor the fourth partition 5 has a connecting hole 21 at the bottom, allowing the high-temperature liquid storage main chamber 111 and the high-temperature liquid storage sub-chamber 112 to communicate at the top but separate at the bottom, and the low-temperature liquid storage main chamber 131 and the low-temperature liquid storage sub-chamber 132 to communicate at the top but separate at the bottom. The height of the second partition 3 is lower than the minimum liquid level of the expansion tank body 1, ensuring fluid communication between the chambers and better separating water vapor within the chambers. The minimum liquid level of the expansion tank body 1 is calculated and determined based on the water volume within the expansion tank. The minimum liquid level of the expansion tank body 1 is determined when the water volume within the expansion tank equals 5-8% of the total water volume of the thermal management system.

[0065] Combine Figure 1 and Figure 2 Expansion tank body 1 has two longitudinally oriented sides, each with an exhaust vent and a water inlet located at the bottom of the body. One vent connects to the high-temperature liquid storage chamber 112, while the other connects to the low-temperature liquid storage chamber 132, effectively separating water vapor from the chambers. The buffer chamber 12 effectively avoids factors such as the exhaust vent and water inlet that could affect liquid level stability, ensuring a relatively stable liquid level.

[0066] There are two sets of water supply pipes 9, each set located at the lower portion of the two side walls of the expansion water tank body 1. The water supply pipe seat 9 on one side communicates with the high-temperature liquid storage main chamber 111 of the high-temperature water chamber 11, while the water supply pipe 9 on the other side communicates with the low-temperature liquid storage main chamber 131 of the low-temperature water chamber 13. The end of the water supply pipe 9 located within the high-temperature liquid storage main chamber 111 is configured as an oblique surface, with the angle between the oblique surface and the bottom wall of the expansion water tank body 1 being between 5° and 90°. The end of the water supply pipe 9 located within the low-temperature liquid storage main chamber 131 is configured as an oblique surface, with the angle between the oblique surface and the bottom plate of the expansion water tank body 1 being between 5° and 90°. The cut of the oblique surface faces the bottom wall of the expansion water tank body 1, thereby better achieving water vapor separation.

[0067] The float level switch 6 can be installed at the top or bottom of the expansion tank body 1, depending on the actual operating space. In this embodiment, it is installed at the top of the expansion tank body 1. The float level switch 6 can provide an alarm signal and a main power cutoff signal based on liquid level changes, ensuring sufficient liquid for the water circulation system to operate. The float level switch 6 can be equipped with one, two, or three floats. In this embodiment, two floats are used as an example. The first float 61 and the second float 62 are both located within the buffer chamber 12, with the second float 62 installed at a higher height than the first float 61. One float cuts off the main power signal, and the other provides a warning signal. Each float operates independently and does not interfere with the other. When the total water volume in the thermal management system decreases to a certain level (5% in this embodiment), the float level switch 6 outputs a switch signal, which is transmitted to the alarm to generate an alarm. When the total water volume in the thermal management system decreases to a certain level (8% in this embodiment), the float level switch 6 outputs a switch signal, which is transmitted to the power system to control unloading and cut off the main power.

[0068] The liquid level gauge 8 is located outside the buffer chamber 12 and is installed in a position that facilitates observation of the liquid level in the buffer chamber 12, enabling clear and intuitive observation of the water level in the buffer chamber 12. The liquid level gauge 8 is marked with a maximum liquid level line and a minimum liquid level line. The height of the maximum liquid level line from the bottom wall of the expansion tank body 1 is H3, and the height of the minimum liquid level line from the bottom wall of the expansion tank body 1 is H2.

[0069] The liquid inlet of the overflow pipe 20 is disposed within the buffer chamber 12, and the liquid outlet of the overflow pipe 20 extends to the exterior of the expansion tank body 1 and communicates with the external environment. The liquid inlet of the overflow pipe 20 is higher than the liquid outlet of the overflow pipe 20. The height from the liquid inlet of the overflow pipe 20 to the bottom wall of the expansion tank body 1 is denoted as H4. The overflow pipe 20 can be installed at the bottom or side of the expansion tank body 1, depending on the actual operating space of the product. This embodiment uses installation at the bottom of the expansion tank body 1 as an example. The upper end of the overflow pipe 20 is located within the buffer chamber 12, and the lower end penetrates the bottom wall of the expansion tank body 1 and extends to the exterior of the expansion tank body 1.

[0070] Combine Figure 2 and Figure 3The heights of the first baffle 2, the second baffle 3, the third baffle 4 and the fourth baffle 5 are all lower than the height of the top wall of the expansion tank body 1, so that the upper parts of the cavities are interconnected to form an air cavity. The gas volume in the expansion tank body 1 is preferably 7-12% of the total liquid volume of the thermal management system, and can be greater than 12% of the total liquid volume of the thermal management system; the height of the inner cavity of the expansion tank body 1 is H6; the height of the first baffle 2 and the second baffle 3 from the bottom wall of the expansion tank body 1 is H5; the height of the third baffle 4 and the fourth baffle 5 from the inner wall of the bottom plate of the expansion tank body 1 is H1; the height of the center line of the second float 62 from the bottom wall of the expansion tank body 1 is H7; the height of the center line of the first float 61 from the inner wall of the bottom plate of the expansion tank body 1 is H8, H6>H5>H4>H3>H2>H1, and H8<H2. To prevent high and low temperature water in the expansion tank body 1 from flowing randomly, the height of the overflow liquid level is calculated and determined according to the water volume in the expansion tank, and the liquid level height when the water volume in the expansion tank is greater than or equal to 20% of the total water volume of the thermal management system is used as the overflow liquid level.

[0071] The two-way pressure valve can be installed on the top or side wall of the expansion tank body 1, depending on the actual operating space of the product. When the two-way pressure valve is installed on the side wall of the expansion tank body 1, the lowest point of the two-way pressure valve mounting hole on the side wall of the expansion tank body 1 should be at a height greater than H4 from the inner wall of the bottom plate of the expansion tank body 1. When the two-way pressure valve is installed on the top and side walls of the expansion tank body 1, the operating pressure of the expansion tank body 1 is guaranteed. When the internal pressure of the expansion tank body 1 is too high, the pressure valve opens in the forward direction to prevent the operating pressure of the expansion tank from being too high; when the internal pressure of the expansion tank is too low, the pressure valve opens in the reverse direction to prevent the operating pressure of the expansion tank from being too low.

[0072] The implementation principle of Example 1 of the present application is: the high-temperature water chamber, the low-temperature water chamber and the upper part of the buffer chamber in the expansion water tank body 1 are gas-connected, and the lower part is liquid-connected through a specially designed connecting hole 21, forming a high- and low-temperature integrated expansion water tank. The integrated expansion water tank realizes the interconnection of the high-temperature water chamber and the low-temperature water chamber through a partition with a connecting hole 21 between the high-temperature water chamber and the low-temperature water chamber, thereby realizing liquid complementarity of high-temperature water and low-temperature water in the thermal management system under specific circumstances. At the same time, the buffer chamber can avoid the influence of the water replenishment and exhaust process on the stability of the float, thereby reducing the possibility of issuing an erroneous liquid level alarm signal. The high-temperature water chamber is divided into a high-temperature liquid storage main chamber and a high-temperature liquid storage sub-chamber. The high-temperature liquid storage main chamber and the high-temperature liquid storage sub-chamber have upper portions that extend through the lower compartment. The low-temperature water chamber is divided into a low-temperature liquid storage main chamber and a low-temperature liquid storage sub-chamber. The low-temperature liquid storage main chamber and the low-temperature liquid storage sub-chamber have upper portions that extend through the lower compartment. This creates five water chambers: the high-temperature liquid storage main chamber, the high-temperature liquid storage sub-chamber, the buffer chamber, the low-temperature liquid storage main chamber, and the low-temperature liquid storage sub-chamber. This prevents exhaust gas from entering the thermal management system's water supply line. The integrated expansion water tank adopts a three-chamber, five-chamber structure, effectively reducing the probability of failures caused by insufficient expansion water tank fluid during train operation, thereby further reducing train operation and maintenance costs. The integrated expansion water tank also saves installation space and has low manufacturing costs.

[0073] Example 2

[0074] Reference Figure 4 A thermal management system for an internal combustion power pack includes a high-temperature water thermal management system 30, a low-temperature water thermal management system 40, an integrated expansion water tank disclosed in Example 1, a fan assembly 50, and a hydraulic drive system 60.

[0075] Combine Figure 4 and Figure 5 The high-temperature water thermal management system 30 includes a high-temperature main circulation loop consisting of a high-temperature water pump 301, a diesel engine 302, a high-temperature water temperature control valve 303, a high-temperature water radiator group 304, a transmission oil heat exchanger 305 and a high-temperature water pipeline, and a high-temperature expansion loop consisting of the integrated expansion water tank, a high-temperature water pump water supply pipe 307 and several high-temperature exhaust pipes;

[0076] One end of the high-temperature water pump water supply pipe 307 is connected to the inlet pipe of the high-temperature water pump 301, and the other end is connected to the pipe seat of the water supply pipe 9; the several high-temperature exhaust pipes include exhaust pipe 1 3081 for connecting to the transmission oil heat exchanger 305, exhaust pipe 2 3082 for connecting to the diesel engine 302, and exhaust pipe 3 3083 for connecting to the high-temperature water radiator group 304. The other ends of the exhaust pipe 1 3081, the exhaust pipe 2 3082, and the exhaust pipe 3 3083 are collected and connected to the integrated expansion water tank exhaust pipe seat 10, and the exhaust pipe seat 10 is connected to the high-temperature liquid storage sub-chamber 112 of the high-temperature water chamber 11; the hydraulic drive system 60 can control the fan assembly 50 to act on the high-temperature water thermal management system 30 and the low-temperature water thermal management system 40 to reduce the heat of the thermal management system.

[0077] The high-temperature water radiator utilizes an aluminum plate-fin structure. The transmission oil heat exchanger 305 utilizes a brazed plate heat exchanger. High-temperature water from the diesel engine 302 exchanges heat with cooling air through the high-temperature water radiator assembly 304. After being cooled by the high-temperature water radiator assembly 304, the high-temperature water passes through the transmission oil heat exchanger 305, removing heat from the transmission oil in the hydraulic transmission case 309. This embodiment utilizes system design calculations to rationally control the opening and closing of the temperature control valve, thereby achieving thermal management of the diesel engine 302 and the hydraulic transmission case 309 of the internal combustion power system.

[0078] The high-temperature water pipeline includes a high-temperature pipeline A3061, a high-temperature pipeline B3062 and a high-temperature pipeline C3063, wherein the high-temperature pipeline A3061 is arranged between the high-temperature water outlet of the transmission oil heat exchanger 305 and the inlet of the high-temperature water temperature control valve 303, and the high-temperature pipeline B3062 and the high-temperature pipeline C3063 are both arranged between the outlet of the high-temperature water temperature control valve 303 and the high-temperature water inlet of the transmission oil heat exchanger 305, and the high-temperature pipeline B3062 and the high-temperature pipeline C3063 are connected in parallel. The high-temperature water pump 301 and diesel engine 302 are both located on high-temperature pipeline A3061, and the high-temperature water radiator assembly 304 is located on high-temperature pipeline C3063. The high-temperature water in the high-temperature water pipeline flows from the transmission oil heat exchanger 305, passes through the high-temperature water pump 301 and diesel engine 302, and reaches the high-temperature water temperature control valve 303. The temperature control valve is then opened and closed according to the water temperature, forming two high-temperature water circulation pipelines: high-temperature pipeline B3062 and high-temperature pipeline C3063. The water supply pipe 9, located outside the high-temperature water chamber, is connected to the high-temperature pipeline A3061 at its socket. The connection between the water supply pipe 9 and high-temperature pipeline A3061 is located between the high-temperature water pump 301 and the transmission oil heat exchanger 305, and is used to replenish water from the integrated expansion tank to the high-temperature water subsystem circuit.

[0079] When the outlet water temperature of the diesel engine 302 is lower than the minimum set temperature T of the high temperature water temperature control valve 303 G1When the high-temperature water temperature control valve 303 completely closes the high-temperature pipeline C3063 and completely opens the return high-temperature pipeline B3062, the high-temperature water flows through the high-temperature water temperature control valve 303 without passing through the high-temperature radiator group, and all flows directly to the transmission oil heat exchanger 305, and then flows back to the diesel engine 302 after passing through the high-temperature water pump 301, thereby preventing the diesel engine 302 and the hydraulic transmission box 309 from operating at too low a temperature.

[0080] When the outlet water temperature of the diesel engine 302 ≥ T G1 and ≤T G2 When the high-temperature water flows through the high-temperature water temperature control valve 303, part of it flows directly to the inlet water pipe of the transmission oil heat exchanger 305, and the other part flows to the high-temperature radiator group and then flows to the inlet water pipe of the transmission oil heat exchanger 305. The two parts of water flow merge and flow through the transmission oil heat exchanger 305, and then pass through the high-temperature water pump 301 and flow back to the diesel engine 302, forming a mixed cycle.

[0081] When the outlet water temperature of the diesel engine 302 is higher than the temperature T G2 When the high-temperature water temperature control valve 303 fully opens the high-temperature pipeline C3063 and fully closes the high-temperature pipeline B3062, the high-temperature water at the outlet of the diesel engine 302 all passes through the high-temperature pipeline C3063, and the high-temperature water flows through the high-temperature water radiator group 304 for heat exchange and then dissipates heat to the transmission oil heat exchanger 305 to ensure that the diesel engine 302 and the hydraulic transmission box 309 operate at normal temperature.

[0082] Specifically, T G1 and T G2 It is determined based on the maximum allowable outlet water temperature of the diesel engine 302 of the entire high-temperature water system, the oil outlet temperature of the hydraulic transmission box 309, the heat dissipation power of the high-temperature water radiator group 304, the heat dissipation power of the transmission oil heat exchanger 305 and the high-temperature water flow of the thermal management system.

[0083] Combine Figure 4 and Figure 6The low-temperature water thermal management system 40 includes a low-temperature main circulation loop consisting of a low-temperature water pump 401, a water-to-air intercooler 402, an auxiliary generator 403, a hydraulic oil heat exchanger 404, a low-temperature water temperature control valve 405, a low-temperature water radiator group 406 and a low-temperature water pipeline, and a low-temperature expansion loop consisting of the integrated expansion water tank, a low-temperature water pump water supply pipe 408, and a plurality of low-temperature exhaust pipes; one end of the low-temperature water pump water supply pipe 408 is connected to the inlet pipeline of the low-temperature water pump 401, and the other end is connected to the pipe seat of the integrated expansion water tank water supply pipe 9, and the water supply pipe 9 is connected to the low-temperature The low-temperature liquid storage main chamber 131 of the warm water chamber 13 is connected; the several low-temperature exhaust pipes include a fourth exhaust pipe 4091 for connecting to the low-temperature water radiator group 406, a fifth exhaust pipe 4092 for connecting to the hydraulic oil heat exchanger 404, and a sixth exhaust pipe 4093 for connecting to the water-to-air intercooler 402. The other ends of the fourth exhaust pipe 4091, the fifth exhaust pipe 4092, and the sixth exhaust pipe 4093 are connected to the integrated expansion water tank exhaust pipe socket 10, and the exhaust pipe socket 10 is connected to the low-temperature liquid storage sub-chamber 132 of the low-temperature water chamber 13;

[0084] The auxiliary generator 403 and the water-to-air intercooler 402 are arranged in parallel in the low-temperature main circulation loop;

[0085] The low-temperature water radiator utilizes an aluminum plate-fin structure. The hydraulic oil heat exchanger 404 utilizes a brazed plate heat exchanger. The water-to-air intercooler 402 utilizes an aluminum plate-fin structure. The low-temperature water temperature control valve 405 regulates the flow of water in the main circulation loop of the low-temperature water thermal management system 40, thereby achieving thermal management of the auxiliary generator 403 of the internal combustion power system, the pressurized air of the diesel engine 302, and the hydraulic drive system 60. The low-temperature water pipeline includes low-temperature pipeline A4071, low-temperature pipeline B4072, and low-temperature pipeline C4073. Low-temperature pipeline A4071 is located between the outlet of the low-temperature water pump 401 and the inlet of the low-temperature water temperature control valve 405. Low-temperature pipelines B4072 and C4073 are both located between the inlet of the low-temperature water pump 401 and the outlet of the low-temperature water temperature control valve 405. Low-temperature pipelines B4072 and C4073 are connected in parallel. Low-temperature water radiator assembly 406 is installed on low-temperature pipeline C4073. After flowing from low-temperature water pump 401, the liquid in this pipeline passes through the parallel pipelines of water-to-air intercooler 402 and auxiliary generator 403, hydraulic oil heat exchanger 404, and diesel engine 302. After reaching low-temperature water temperature control valve 405, the valve opens and closes according to the water temperature, forming two low-temperature water circulation pipelines: low-temperature pipeline B4072 and low-temperature pipeline C4073. The pipe socket of the water supply pipe 9 in the low-temperature water chamber is connected to low-temperature pipeline 408. The connection between the water supply pipe 9 and the low-temperature pipeline is located at the low-temperature water pump inlet, which is used to replenish water from the integrated expansion tank to the low-temperature water system circuit in a timely manner.

[0086] When the outlet water temperature of the water-to-air intercooler 402 and the auxiliary generator 403 in the low-temperature water thermal management system 40 is lower than the minimum set temperature T of the low-temperature water temperature control valve 405, D1 When the low-temperature water flows through the hydraulic oil heat exchanger 404, it all flows directly to the low-temperature water pump 401 through the low-temperature water temperature control valve 405 and returns to the water-to-air intercooler 402 and the auxiliary generator 403, ensuring that the hydraulic drive system 60 and the auxiliary generator 403 operate at normal temperature.

[0087] When the outlet water temperature of the water-to-air intercooler 402 and the auxiliary generator 403 in the low-temperature water thermal management system 40 is higher than the maximum set temperature T of the low-temperature water temperature control valve 405, D2 When the low-temperature water flows through the low-temperature water temperature control valve 405, it all flows through the low-temperature water radiator group 406, then flows to the low-temperature water pump 401, and then flows back to the water-to-air intercooler 402 and the auxiliary generator 403, thereby preventing the hydraulic oil temperature of the hydraulic drive system 60 from being too low.

[0088] When the outlet water temperature of the water-to-air intercooler 402 and the auxiliary generator 403 in the low-temperature water thermal management system 40 is greater than or equal to T D1 and ≤T D2 When the low-temperature water flows through the hydraulic oil heat exchanger 404, a part of it flows directly to the low-temperature water pump 401 through the low-temperature water temperature control valve 405; the other part flows through the low-temperature water radiator group 406 and then flows to the low-temperature water pump 401. The low-temperature water is merged in the low-temperature water pump 401 and then flows back to the water-to-air intercooler 402 and the auxiliary generator 403.

[0089] Specifically, T D1 and T D2 It is determined based on the allowable inlet and outlet temperatures of the auxiliary generator 403 of the entire low-temperature water system, the charge air temperature of the diesel engine 302, the heat dissipation power of the low-temperature water radiator, the heat dissipation power of the hydraulic oil heat exchanger 404 and the system low-temperature water flow rate.

[0090] The low-temperature water radiator group 406 and the high-temperature water radiator group 304 may both adopt a structure in which one or more low-temperature water radiators are connected in parallel or in series. This embodiment takes two radiators arranged in series as an example.

[0091] Combine Figure 4 and Figure 7 The high-temperature water radiator group and the low-temperature water radiator group are respectively arranged on both sides of the fan assembly. The integrated expansion water tank, high-temperature water radiator group, low-temperature water radiator group, and fan assembly are all installed inside the frame to form a cooling device.

[0092] The fan assembly 50 includes a plurality of fans 501 and anti-cavitation hydraulic motors 502. The number of anti-cavitation hydraulic motors 502 is equal to the number of fans 501, and the anti-cavitation hydraulic motors 502 drive the fans 501 to rotate. The low-temperature water radiator group 406 and the high-temperature water radiator group 304 are arranged on both sides of the fan 501 relative to each other, and the two radiators located on the same side of the fan 501 are connected in series. Compared with the prior art, the previous arrangement of the high-temperature water radiator and the low-temperature water radiator in the same group, which were symmetrically arranged on both sides of the fan assembly 50, has been changed. This effectively reduces the possibility of the high-temperature water or low-temperature water temperature monitoring system alarming or even the internal combustion engine stopping operation due to a failure of a fan 501 in the thermal management system. At the same time, the system's pipeline design is optimized, effectively reducing the flow resistance of the fan assembly 50 by up to 10%.

[0093] Specifically, the anti-cavitation hydraulic motor 502 adopts an anti-cavitation design, integrates the valve block on the motor, simplifies the oil pipeline structure of the fan assembly 50, and reduces the failure rate and manufacturing cost of the cooling system.

[0094] The hydraulic drive system 60 includes a hydraulic oil tank 601, a hydraulic pump 602, a fan control system 603, an oil suction filter 604, an oil return filter 605, and hydraulic oil piping. Hydraulic oil drawn in by the hydraulic pump 602 drives the anti-cavitation hydraulic motor 502, which in turn drives the fan 501. The operation of the fan 501 circulates the cooling air required by the low-temperature water radiator group 406 and the high-temperature water radiator group 304. The fan control system 603 collects temperature signals of the pressurized air, hydraulic transmission oil, high-temperature water, and low-temperature water through a control box, and controls the fan 501's speed through the fan 501 controller.

[0095] The oil in the hydraulic oil tank 601 flows through the hydraulic oil pipeline, through the oil suction filter 604, the hydraulic pump 602, the anti-cavitation hydraulic motor 502, and the hydraulic oil heat exchanger 404, before returning to the hydraulic oil tank 601. The hydraulic oil pipeline includes hydraulic line A6061, hydraulic line B6062, hydraulic line C6063, and hydraulic line D6064. Hydraulic line A6061 is located between the hydraulic oil tank 601 and the oil inlet of the anti-cavitation hydraulic motor 502. After being drawn from the tank, the hydraulic oil passes through the oil suction filter 604, cools the hydraulic pump 602, and drives the parallel anti-cavitation hydraulic motor 502. The anti-cavitation hydraulic motor 502 drives the fan 501 to rotate, thereby providing ventilation and heat dissipation for both the high-temperature and low-temperature water radiators. Hydraulic line B6062 is located between the outlet of the anti-cavitation hydraulic motor 502 and the inlet of the hydraulic oil heat exchanger 404. The hydraulic oil exchanges heat with the low-temperature water through the hydraulic oil heat exchanger 404. Hydraulic line C6063 is located between the outlet of the hydraulic oil heat exchanger 404 and the hydraulic oil tank 601. The cooled hydraulic oil flows through the return oil filter 605 and returns to the hydraulic oil tank 601. Hydraulic line D6064 is located between the oil drain port of the anti-cavitation hydraulic motor 502 and the hydraulic oil tank 601, protecting the hydraulic drive system 60 from oil leakage.

[0096] The implementation principle of Example 2 of the present application is: adopting a system design scheme of a high-temperature water temperature control valve 303, a low-temperature water temperature control valve 405 and parallel pipelines, and intelligently controlling the opening and closing of the high-temperature water temperature control valve 303 and the low-temperature water temperature control valve 405 according to the operating conditions of the rail transit equipment, thereby realizing three different thermal management circulation modes of large circulation, small circulation and mixed circulation of the internal combustion power pack thermal management system pipeline, and realizing scientific and effective management and recycling of heat of the internal combustion power system diesel engine 302, supercharger, auxiliary generator 403, hydraulic transmission box 309 and hydraulic drive system 60.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements 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. An integrated expansion water tank for a thermal management system, characterized in that: The invention comprises an expansion water tank body (1), a first partition (2), a second partition (3), a third partition (4), a fourth partition (5), a float liquid level switch (6), a pressure relief valve (7), a liquid level gauge (8), a water supply pipe (9), an exhaust pipe seat (10) and an overflow pipe (20); The first baffle (2) and the second baffle (3) are both vertically arranged inside the expansion water tank body (1), dividing the internal space of the expansion water tank body (1) into a high-temperature water chamber (11), a buffer chamber (12) and a low-temperature water chamber (13); the buffer chamber (12) is located between the high-temperature water chamber (11) and the low-temperature water chamber (13); and the high-temperature water chamber (11), the buffer chamber (12) and the low-temperature water chamber (13) are connected at their upper parts; The third partition plate (4) is vertically arranged inside the high-temperature water chamber (11), dividing the high-temperature water chamber (11) into a high-temperature liquid storage main chamber (111) and a high-temperature liquid storage auxiliary chamber (112), wherein the upper parts of the high-temperature liquid storage main chamber (111) and the high-temperature liquid storage auxiliary chamber (112) are connected and separated at the lower part; The fourth partition plate (5) is vertically arranged inside the low-temperature water chamber (13) to separate the low-temperature water chamber (13) into a low-temperature liquid storage main chamber (131) and a low-temperature liquid storage sub-chamber (132), wherein the upper parts of the low-temperature liquid storage main chamber (131) and the low-temperature liquid storage sub-chamber (132) are connected and separated at the lower part; A communication hole (21) is provided on the lower part of the first partition plate (2) and the lower part of the second partition plate (3) on a side close to the bottom wall or side wall of the expansion water tank body (1); the communication hole (21) located on the first partition plate (2) connects the buffer chamber (12) with the high-temperature liquid storage main chamber (111); and the communication hole (21) located on the second partition plate (3) connects the buffer chamber (12) with the low-temperature liquid storage main chamber (131); There are two groups of water supply pipes (9), which are respectively arranged at the lower part of the two side walls of the expansion water tank body (1), wherein the water supply pipe (9) on one side is connected to the high-temperature liquid storage main cavity (111) of the high-temperature water chamber (11), and the water supply pipe (9) on the other side is connected to the low-temperature liquid storage main cavity (131) of the low-temperature water chamber (13); There are two groups of exhaust pipe seats (10), which are respectively arranged at the lower part of the two side walls of the expansion water tank body (1), wherein the exhaust pipe seats (10) on one side are communicated with the high-temperature liquid storage sub-cavity (112) of the high-temperature water chamber (11), and the exhaust pipe seats (10) on the other side are communicated with the low-temperature liquid storage sub-cavity (132) of the low-temperature water chamber (13); The liquid inlet of the overflow pipe (20) is arranged inside the buffer chamber (12), and the liquid outlet of the overflow pipe (20) extends to the outside of the expansion water tank body (1) and communicates with the external environment; the liquid inlet of the overflow pipe (20) is higher than the liquid outlet of the overflow pipe (20).

2. The integrated expansion water tank for a thermal management system according to claim 1, characterized in that: The float liquid level switch (6) comprises a first float (61) and a second float (62), wherein the first float (61) and the second float (62) are both arranged in a buffer chamber (12), and the installation height of the second float (62) is higher than the installation height of the first float (61).

3. The integrated expansion water tank for a thermal management system according to claim 2, characterized in that: The inner cavity height of the expansion water tank body (1) is H6; the height of the first partition (2) and the second partition (3) from the bottom wall of the expansion water tank body (1) is H5; the height of the liquid inlet of the overflow pipe (20) from the bottom wall of the expansion water tank body (1) is H4; the height of the highest liquid level line of the liquid level gauge (8) from the bottom wall of the expansion water tank body (1) is H3; the height of the lowest liquid level line of the liquid level gauge (8) from the bottom wall of the expansion water tank body (1) is H4; The height of the bottom wall of the water tank body (1) is H2; the height of the third partition (4) and the fourth partition (5) from the inner wall of the bottom plate of the expansion water tank body (1) is H1; the height of the center line of the first float (61) from the bottom wall of the expansion water tank body (1) is H7; the height of the center line of the second float (62) from the inner wall of the bottom plate of the expansion water tank body (1) is H8, H6>H5>H4>H3>H2>H1, and H8<H2.

4. The integrated expansion water tank for a thermal management system according to claim 3, characterized in that: The pressure relief valve (7) is a two-way pressure valve. The pressure relief valve (7) is arranged on the top wall or the side wall of the expansion water tank body (1). When the pressure relief valve (7) is arranged on the side wall of the expansion water tank body (1), the height of the lowest point on the side wall of the expansion water tank body (1) corresponding to the mounting hole of the pressure relief valve (7) from the inner wall of the bottom plate of the expansion water tank body (1) should be greater than H4.

5. The integrated expansion water tank for a thermal management system according to claim 1, characterized in that: The end of the water supply pipe (9) located in the high-temperature liquid storage main chamber (111) is configured as an oblique section, and the angle between the oblique section and the bottom wall of the expansion water tank body (1) is between 5° and 90°; The end of the water supply pipe (9) located in the low-temperature liquid storage main chamber (131) is arranged to be an oblique section, and the angle between the oblique section and the bottom plate of the expansion water tank body (1) is between 5° and 90°.

6. An internal combustion power pack thermal management system, characterized in that: It comprises a high-temperature water thermal management system (30), a low-temperature water thermal management system (40), an integrated expansion water tank according to any one of claims 1 to 5, a fan assembly (50), and a hydraulic drive system (60); The high-temperature water thermal management system (30) includes a high-temperature main circulation loop consisting of a high-temperature water pump (301), a diesel engine (302), a high-temperature water temperature control valve (303), a high-temperature water radiator group (304), a transmission oil heat exchanger (305) and a high-temperature water pipeline, and a high-temperature expansion loop consisting of the integrated expansion water tank, a high-temperature water pump water supply pipe (307) and a plurality of high-temperature exhaust pipes; One end of the high-temperature water pump water supply pipe (307) is connected to the inlet pipe of the high-temperature water pump (301), and the other end is connected to the pipe seat of the water supply pipe (9); the plurality of high-temperature exhaust pipes include an exhaust pipe 1 (3081) for connecting to the transmission oil heat exchanger (305), an exhaust pipe 2 (3082) for connecting to the diesel engine (302), and an exhaust pipe 3 (3083) for connecting to the high-temperature water radiator group (304); the other ends of the exhaust pipe 1 (3081), the exhaust pipe 2 (3082), and the exhaust pipe 3 (3083) are connected to the exhaust pipe seat (10) of the integrated expansion water tank after being collected, and the exhaust pipe seat (10) is connected to the high-temperature liquid storage sub-chamber (112) of the high-temperature water chamber (11); The low-temperature water thermal management system (40) includes a low-temperature main circulation loop consisting of a low-temperature water pump (401), a water-to-air intercooler (402), an auxiliary generator (403), a hydraulic oil heat exchanger (404), a low-temperature water temperature control valve (405), a low-temperature water radiator group (406) and a low-temperature water pipeline, and a low-temperature expansion loop consisting of the integrated expansion water tank, a low-temperature water pump (401) water supply pipe, and a plurality of low-temperature exhaust pipes; one end of the low-temperature water pump (401) water supply pipe is connected to the low-temperature water pump (401) inlet pipe, and the other end is connected to the pipe seat of the integrated expansion water tank water supply pipe (9), and the water supply pipe (9) is connected to the low-temperature water chamber. (13) is connected to the low-temperature liquid storage main chamber (131); the plurality of low-temperature exhaust pipelines include an exhaust pipeline four (4091) for connecting to the low-temperature water radiator group (406), an exhaust pipeline five (4092) for connecting to the hydraulic oil heat exchanger (404), and an exhaust pipeline six (4093) for connecting to the water-air intercooler (402); the other ends of the exhaust pipeline four (4091), the exhaust pipeline five (4092), and the exhaust pipeline six (4093) are connected to the exhaust pipe seat (10) of the integrated expansion water tank after being collected, and the exhaust pipe seat (10) is connected to the low-temperature liquid storage sub-chamber (132) of the low-temperature water chamber (13); The auxiliary generator (403) and the water-to-air intercooler (402) are arranged in parallel in the low-temperature main circulation loop; The integrated expansion water tank, high-temperature water radiator group (304), low-temperature water radiator group (406), and fan assembly (50) are all installed inside the frame to form a cooling device; The high-temperature water radiator group (304) and the low-temperature water radiator group (406) are respectively arranged on both sides of the fan assembly.

7. The internal combustion power pack thermal management system according to claim 6, characterized in that: The high-temperature water temperature control valve (303) and the low-temperature water temperature control valve (405) are three-way valves with adjustable openings. When the high-temperature water thermal management system (30) is regulated by the high-temperature water temperature control valve (303), the regulation method is as follows: When the outlet water temperature of the diesel engine (302) in the high-temperature water thermal management system (30) is lower than the lowest set temperature T of the high-temperature water temperature control valve (303), G1 When the high-temperature water flows through the high-temperature water temperature control valve (303), it does not pass through the high-temperature water radiator group, and all flows directly to the transmission oil heat exchanger (305), and then flows back to the diesel engine (302) after passing through the high-temperature water pump (301); When the outlet water temperature of the diesel engine (302) in the high-temperature water thermal management system (30) is higher than the maximum set temperature T of the high-temperature water temperature control valve (303), G2 When the high-temperature water flows through the high-temperature water temperature control valve (303), all flows through the high-temperature water radiator group, then flows to the transmission oil heat exchanger (305), and then flows back to the diesel engine (302) after passing through the high-temperature water pump (301); When the outlet water temperature of the diesel engine (302) in the high-temperature water thermal management system (30) is ≥T G1 and ≤T G2 When the high-temperature water flows through the high-temperature water temperature control valve (303), a portion of the high-temperature water flows directly to the inlet water pipe of the transmission oil heat exchanger (305), and the other portion flows to the high-temperature water radiator group and then flows to the inlet water pipe of the transmission oil heat exchanger (305). The two portions of water flow merge and flow through the transmission oil heat exchanger (305), and then flow back to the diesel engine (302) after passing through the high-temperature water pump (301); When the low-temperature water temperature control valve (405) is used to control the water flow direction of the main circulation loop of the low-temperature water heat management system (40), the control method is as follows: When the outlet water temperature of the water-to-air intercooler (402) and the auxiliary generator (403) in the low-temperature water thermal management system (40) is lower than the lowest set temperature T of the low-temperature water temperature control valve (405), D1 When the low-temperature water flows through the hydraulic oil heat exchanger (404), all of it flows directly to the low-temperature water pump (401) through the low-temperature water temperature control valve (405) and returns to the water-to-air intercooler (402) and the auxiliary generator (403); When the outlet water temperature of the water-to-air intercooler (402) and the auxiliary generator (403) in the low-temperature water thermal management system (40) is higher than the maximum set temperature T of the low-temperature water temperature control valve (405), D2 When the low-temperature water flows through the low-temperature water temperature control valve (405), all flows through the low-temperature water radiator group (406), then flows to the low-temperature water pump (401), and then flows back to the water-to-air intercooler (402) and the auxiliary generator (403); When the outlet water temperature of the water-to-air intercooler (402) and the auxiliary generator (403) in the low-temperature water thermal management system (40) is greater than or equal to T D1 and ≤T D2 When the low-temperature water flows through the hydraulic oil heat exchanger (404), a portion of the low-temperature water flows directly to the low-temperature water pump (401) through the low-temperature water temperature control valve (405); the other portion flows through the low-temperature water radiator group (406) and then flows to the low-temperature water pump (401). The low-temperature water is combined in the low-temperature water pump (401) and then flows back to the water-to-air intercooler (402) and the auxiliary generator (403).

8. The internal combustion power pack thermal management system according to claim 6, characterized in that: The high-temperature water radiator group (304) is composed of a plurality of high-temperature water radiators connected in series or in parallel; the low-temperature water radiator group (406) is composed of a plurality of low-temperature water radiators connected in series or in parallel.

9. The internal combustion power pack thermal management system according to claim 6, characterized in that: The fan assembly (50) includes a fan (501) and an anti-cavitation hydraulic motor (502), wherein the anti-cavitation hydraulic motor (502) drives the fan (501) to rotate; The hydraulic drive system (60) comprises a hydraulic oil tank (601), a hydraulic pump (602), a fan control system (603), an oil suction filter (604), an oil return filter (605) and a hydraulic oil pipeline. The oil in the hydraulic oil tank (601) flows through the oil suction filter (604), the hydraulic pump (602), the anti-cavitation hydraulic motor (502), and the hydraulic oil heat exchanger (404) through the hydraulic oil pipeline and then returns to the hydraulic oil tank (601). The fan control system (603) controls the speed of the anti-cavitation hydraulic motor (502) according to the oil temperature, thereby controlling the speed of the fan (501).

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