Multi-mode automobile part cold and hot water circulation test system and method

Abstract

The invention relates to a multi-mode automobile part cold and hot water circulation test system and method. The invention discloses a multi-mode automobile part cold and hot water circulation test system which comprises a refrigeration system, an inner circulation system and an outer circulation system. The internal circulation system is provided with a cold box and a hot box; the outer circulation system is provided with an outer circulation main path and a water circulation branch path; the water circulation branch comprises a first water inlet branch, a second water inlet branch, a first water return branch and a second water return branch which can be independently controlled; the first water inlet branch and the second water inlet branch are arranged on the water inlet side of the outer circulation main path in parallel. The first water return branch and the second water return branch are arranged on the water return side of the outer circulation main path in parallel. The first water inlet branch and the first water return branch are connected with the cold box; and the second water inlet branch and the second water return branch are connected with the hot box. According to the cold and hot water circulation test system, multiple test modes are integrated, high and low temperature conversion is achieved through linkage switching of multiple electromagnetic valves, and the energy utilization rate is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of test equipment, and particularly to a multi-mode cold and hot water circulation test system and method for automotive parts. Background Art

[0002] In recent years, the global energy situation has become increasingly tense, and the requirements for environmental protection have been continuously improved. As an important means of energy conservation and emission reduction, new energy vehicles have entered a period of rapid development. The government has successively introduced a series of support policies to promote the development of the new energy vehicle industry, and the acceptance of new energy vehicles by consumers has also been continuously improved. The production and sales volume of new energy vehicles continue to grow, the market share continues to expand, and it has gradually become an important development direction of the automotive industry.

[0003] In order to ensure the quality and reliability of new energy vehicles and protect the use safety and rights of consumers, the International Organization for Standardization has formulated the environmental conditions and test standards ISO 16750-4 for electrical and electronic equipment of road vehicles. This standard stipulates the test methods and requirements for automotive electronic components under different temperature conditions. By conducting reliability verification under extreme temperature environments in accordance with this standard, it can be ensured that core components such as automotive accessories, motor controllers, battery packs, and transformers can work properly in various harsh environments, and it also helps to promote the healthy development of the new energy vehicle industry.

[0004] However, traditional cold and hot water circulation test equipment only supports a single test mode, such as a single standard test or a single temperature change test, and cannot meet the multi-scenario test requirements. It is often necessary to add multiple devices with various functions to meet multiple test modes, which directly leads to high test costs, large floor areas, and complex operation procedures. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a multi-mode cold and hot water circulation test system for automotive parts, which integrates multiple test modes, saves costs, and reduces the floor area; uses a cold box and a hot box, combines multi-solenoid valve linkage switching to achieve high and low temperature conversion, and at the same time effectively shortens the time of heat exchange process and the cold and hot conversion time, improves the working efficiency of the equipment, and improves the energy utilization rate.

[0006] A multi-mode cold and hot water circulation test system for automotive parts includes:

[0007] A refrigeration system, an internal circulation system, and an external circulation system, with a test load arranged in the external circulation system; the refrigeration system is used to provide cold energy for the internal circulation system; the internal circulation system is provided with a cold box and a hot box, which are used to provide cold water and hot water for the test load;

[0008] The external circulation system is provided with an external circulation main path and a water circulation branch path; the test load is arranged on the external circulation main path; the water circulation branch path includes a first water inlet branch path, a second water inlet branch path, a first water return branch path and a second water return branch path;

[0009] The first water inlet branch path and the second water inlet branch path are arranged in parallel on the water inlet side of the external circulation main path, and the water inlet end of the first water inlet branch path is connected to the cold box for introducing cold water; the water inlet end of the second water inlet branch path is connected to the hot box for introducing hot water;

[0010] The first water return branch path and the second water return branch path are arranged in parallel on the water return side of the external circulation main path, and the water outlet end of the first water return branch path is connected to the cold box for returning water to the cold box; the water outlet end of the second water return branch path is connected to the hot box for returning water to the hot box.

[0011] Further, the external circulation system is also provided with an air circulation branch path for supplying air to the test load;

[0012] The air circulation branch path includes an air inlet branch path and an air return branch path with one end connected to the external circulation main path; the air inlet branch path is arranged on the water inlet side of the test load, and the air return branch path is arranged on the water return side of the test load.

[0013] Further, the first water inlet branch path is provided with a first solenoid valve; the first water return branch path is provided with a second solenoid valve;

[0014] The second water inlet branch path is provided with a third solenoid valve; the second water return branch path is provided with a fourth solenoid valve;

[0015] The external circulation main path is also provided with a fifth solenoid valve and a sixth solenoid valve. The fifth solenoid valve is arranged on the water inlet side of the test load, and the sixth solenoid valve is arranged on the water return side of the test load; the air inlet branch path is connected to the external circulation main path between the fifth solenoid valve and the test load; the air return branch path is connected to the external circulation main path between the sixth solenoid valve and the test load.

[0016] Further, the air inlet branch path is provided with a seventh solenoid valve, and the air return branch path is provided with an eighth solenoid valve.

[0017] Further, the external circulation system is also provided with an expansion tank. The expansion tank is provided with a water inlet and a water replenishment port. The water inlet is connected to the air return branch path, and the water replenishment port is connected to both the cold box and the hot box at the same time.

[0018] Further, the refrigeration system includes a compressor, a condenser, and a first refrigerant branch and a second refrigerant branch connected in parallel on the refrigerant flow path; a first evaporator is provided on the first refrigerant branch, and the cold box is connected to the first evaporator; a second evaporator is provided on the second refrigerant branch, and the hot box is connected to the second evaporator.

[0019] Further, a first throttle valve and a first temperature sensor are also provided on the first refrigerant branch, respectively provided at the liquid inlet end and the liquid outlet end of the first evaporator;

[0020] A second throttle valve and a second temperature sensor are also provided on the second refrigerant branch, respectively provided at the liquid inlet end and the liquid outlet end of the second evaporator.

[0021] Further, the refrigeration system further includes a third refrigerant branch connected in parallel with the first refrigerant branch and the second refrigerant branch, and a third throttle valve is provided on the third refrigerant branch.

[0022] A multi-mode cold and hot water circulation test method for automotive parts uses a multi-mode cold and hot water circulation test system of the present invention to test a test load in a standard test mode, a rapid temperature change mode, and a temperature shock mode.

[0023] Further, the rapid temperature change mode includes a cooling rapid temperature change process and a heating rapid temperature change process;

[0024] The test steps of the cooling rapid temperature change process are as follows: in the initial state of the hot box circulation, close the second water inlet branch, open the first water inlet branch, conduct the first water inlet branch and the second water return branch, and after running for a period of time, switch the flow path, close the second water return branch, open the first water return branch, and conduct the first water inlet branch and the first water return branch;

[0025] The test steps of the heating rapid temperature change process are as follows: in the initial state of the cold box circulation, close the first water inlet branch, open the second water inlet branch, conduct the second water inlet branch and the first water return branch, and after running for a period of time, switch the flow path, close the first water return branch, open the second water return branch, and conduct the second water inlet branch and the second water return branch.

[0026] Further, the temperature change and shock mode includes a cooling shock process and a heating shock process;

[0027] The test steps of the cooling shock process are as follows: close the water circulation branch, conduct the air inlet branch and the return air branch, blow out the stored water in the test load, and then switch the flow path, conduct the first water inlet branch and the first water return branch, and perform cold box circulation;

[0028] The test steps of the heating shock process are as follows: close the water circulation branch, conduct the intake branch and the return air branch, blow out the stored water in the test load, and then switch the flow path to conduct the second water inlet branch and the second water return branch for hot box circulation.

[0029] The beneficial effects of the present invention are as follows:

[0030] (1) By using the cooperation of the refrigeration system and the heating element to precisely control the temperature of the cold box and the hot box, the adjustment accuracy is high;

[0031] (2) By integrating the refrigeration system, the internal circulation system and the external circulation system, the test system can implement tests in multiple modes, meet various test requirements, reduce the floor area and save costs;

[0032] (3) By dynamically switching multiple solenoid valves to achieve compatibility of multiple test modes, the test process is simplified, and at the same time, the heat exchange efficiency of the equipment can be improved;

[0033] (4) By the cooperation of the cold box and the hot box, delaying the control to switch the cold and hot water sources to increase the temperature change rate; at the same time, through the water circulation branch and the air circulation branch controlled by solenoid valve switching, the impact conversion time is effectively shortened, and the working efficiency of the equipment is improved.

[0034] For better understanding and implementation, the present invention will be described in detail below with reference to the accompanying drawings. Description of the Drawings

[0035] Figure 1 It is the pipeline connection diagram of the multi-mode cold and hot water circulation test system for automotive parts;

[0036] Figure 2 It is the structural schematic diagram of the refrigeration system;

[0037] Figure 3 It is the structural schematic diagram of the internal circulation system and the external circulation system.

[0038] In the figure: 10 - refrigeration system; 11 - compressor; 12 - oil separator; 13 - condenser; 14 - dryer filter; 151 - first refrigerant branch; 1511 - first throttle valve; 1512 - first evaporator; 1513 - first temperature sensor; 152 - second refrigerant branch; 1521 - second throttle valve; 1522 - second evaporator; 1523 - second temperature sensor; 153 - third refrigerant branch; 1531 - third throttle valve; 16 - third temperature sensor; 20 - internal circulation system; 21 - cold water circuit; 211 - cold box; 212 - first water pump; 213 - first heating element; 22 - hot water circuit; 221 - hot box; 222 - second water pump; 223 - second heating element; 30 - external circulation system; 31 - main external circulation path; 310 - external circulation water pump; 311 - fifth solenoid valve; 312 - sixth solenoid valve; 313 - water inlet joint; 314 - water inlet pressure sensor; 315 - flow sensor; 316 - water return joint; 317 - water return pressure sensor; 318 - water return temperature sensor; 32 - water circulation branch; 321 - first water inlet branch; 3211 - first solenoid valve; 322 - second water inlet branch; 3221 - third solenoid valve; 323 - first water return branch; 3231 - second solenoid valve; 324 - second water return branch; 3241 - fourth solenoid valve; 33 - air circulation branch; 331 - air inlet branch; 3311 - seventh solenoid valve; 332 - air return branch; 3321 - eighth solenoid valve; 333 - air compressor; 334 - expansion tank; 40 - test load. Detailed implementation manner

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0040] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "vertical direction", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, "first", "second", "third", and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or a connection through an intermediate medium; it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] Please refer to Figures 1-3 , an embodiment of the present application provides a multi-mode cold and hot water circulation test system for automotive parts, including: a refrigeration system 10, an internal circulation system 20, and an external circulation system 30. A test load 40 is arranged in the external circulation system 30; the refrigeration system 10 is used to provide cooling capacity for the internal circulation system 20; the internal circulation system 20 is provided with a cold box 211 and a hot box 221, which are used to provide cold water and hot water for the test load 40.

[0043] Specifically, the external circulation system 30 is provided with an external circulation main path 31, a water circulation branch 32, and an air circulation branch 33; the test load 40 is arranged on the external circulation main path 31; the water circulation branch 32 includes a first water inlet branch 321, a second water inlet branch 322, a first water return branch 323, and a second water return branch 324; the first water inlet branch 321 and the second water inlet branch 322 are arranged in parallel on the water inlet side of the external circulation main path 31, and the first water inlet branch 321 is connected to the cold box 211, which is used to introduce the cold water in the cold box 211 into the external circulation main path 31 to provide cooling capacity for the test load 40; the second water inlet branch 322 is connected to the hot box 221, which is used to introduce the hot water in the hot box 221 into the external circulation main path 31 to provide heat for the test load 40.

[0044] Specifically, the first water return branch 323 and the second water return branch 324 are arranged in parallel on the water return side of the external circulation main path 31, and the first water return branch 323 is connected to the cold box 211, which is used to guide the return water of the test load 40 to the cold box 211; the second water return branch 324 is connected to the hot box 221, which is used to guide the return water of the test load 40 to the hot box 221.

[0045] Specifically, the air circulation branch 33 is used to supply air to the test load 40. The air circulation branch 33 includes an air inlet branch 331 and an air return branch 332 connected to the external circulation main path 31; the air inlet branch 331 is arranged on the water inlet side of the test load 40, and the air return branch 332 is arranged on the water return side of the test load 40. During the operation of the system, the hot water or cold water in the test load 40 is blown out through the air circulation branch 33 to avoid the influence of the water temperature of the stored water in the test load 40 on the test process.

[0046] In this setting mode, when the first water inlet branch 321 and the main external circulation path 31 are conducted, the cold water in the cold box 211 can be introduced into the main external circulation path 31 to provide cooling capacity for the test load 40; when the second water inlet branch 322 and the main external circulation path 31 are conducted, the hot water in the hot box 221 can be introduced into the main external circulation path 31 to provide heat for the test load 40. The return water flowing out of the test load 40 can return to the cold box 211 via the first return water branch 323 or return to the hot box 221 via the second return water branch 324. It can be understood that when the first water inlet branch 321 and the first return water branch 323 are conducted, water is supplied to the cold box 211 and returns to the cold box 211 in a cold box circulation; when the second water inlet branch 322 and the second return water branch 324 are conducted, water is supplied to the hot box 221 and returns to the hot box 221 in a hot box circulation, which will not be elaborated here.

[0047] Furthermore, in some embodiments, the first water inlet branch 321 is provided with a first solenoid valve 3211 for controlling whether to introduce the cold water in the cold box 211 into the main external circulation path 31; the first return water branch 323 is provided with a second solenoid valve 3231 for controlling whether to introduce the return water of the test load 40 into the cold box 211. The second water inlet branch 322 is provided with a third solenoid valve 3221 for controlling whether to introduce the hot water in the hot box 221 into the main external circulation path 31; the second return water branch 324 is provided with a fourth solenoid valve 3241 for controlling whether to introduce the return water of the test load 40 into the hot box 221. It should be noted that controlling the switching of the water circulation branch 32 through the first solenoid valve 3211, the second solenoid valve 3231, the third solenoid valve 3221 and the fourth solenoid valve 3241 is only a specific implementation manner of the embodiment of the present application. In other embodiments, a three-way ball valve can also be provided at the position where the first water inlet branch 321 and the second water inlet branch 322 are connected to the main external circulation path 31 to control the switching of the flow path. Similarly, a three-way ball valve is provided at the connection between the main external circulation path 31 and the first return water branch 323 and the second return water branch 324 to switch the flow path, which will not be elaborated here.

[0048] Furthermore, in some embodiments, the main external circulation path 31 is further provided with a fifth solenoid valve 311 and a sixth solenoid valve 312. Among them, the fifth solenoid valve 311 is arranged on the water inlet side of the test load 40, and the sixth solenoid valve 312 is arranged on the water return side of the test load 40; the air inlet branch 331 is connected between the fifth solenoid valve 311 and the test load 40; the air return branch 332 is connected between the sixth solenoid valve 312 and the test load 40. By closing the fifth solenoid valve 311 and the sixth solenoid valve 312, the air circulation branch 33 can be isolated, which is convenient for blowing out the stored water in the test load 40 faster, effectively shortening the heat exchange process and improving the test efficiency.

[0049] Further, in some embodiments, a seventh solenoid valve 3311 is provided in the intake branch 331, and an eighth solenoid valve 3321 is provided in the return air branch 332. The intake and return air of the test load 40 are controlled by the seventh solenoid valve 3311 and the eighth solenoid valve 3321. In the embodiments of the present application, by performing multi-solenoid valve switching control on each branch and the main path, the control accuracy is improved, the heat exchange efficiency of the equipment is high, and the energy utilization rate is improved.

[0050] Further, in some embodiments, the external circulation system 30 is further provided with an air compressor 333 and an expansion tank 334. The air compressor 333 is connected to the intake end of the intake branch 331 and is used to supply air to the external circulation system 30. In this embodiment, it is used to provide compressed air to blow out the stored water in the test load 40 into the expansion tank 334.

[0051] Further, the expansion tank 334 is provided with a water inlet, an overflow port, and a water replenishment port. The water inlet is connected to the return air branch 332, and the stored water in the test load 40 returns to the expansion tank 334 through the water inlet. At the same time, both the overflow port and the water replenishment port are connected to the cold box 211 and the hot box 221 respectively, and are used to replenish water to the cold box 211 and the hot box 221. Specifically, water level gauges are respectively provided in the cold box 211 and the hot box 221. When the internal water volume is insufficient, water is replenished through the expansion tank 334, which will not be elaborated here.

[0052] Further, in some embodiments, the external circulation system 30 further includes an external circulation water pump 310. The external circulation water pump 310 is provided at the water inlet end of the external circulation main path 31 and provides power for the water flow introduced into the first water inlet branch 321 and the second water inlet branch 322. Preferably, the external circulation water pump 310 is provided at the end of the external circulation main path 31 close to the first water inlet branch 321 and the second water inlet branch 322.

[0053] Further, in some embodiments, the external circulation system 30 further includes a water inlet joint 313, a water inlet pressure sensor 314, and a flow sensor 315 provided at the water inlet end of the external circulation main path 31. The water inlet joint 313 is used to introduce water flow into the test load 40 and is arranged close to the fifth solenoid valve 311. The water inlet pressure sensor 314 and the flow sensor 315 are arranged between the external circulation water pump 310 and the water inlet joint 313 and are used to monitor the water flow pressure and flow rate flowing into the test load 40 in real time. The hot water or cold water sucked by the external circulation water pump 310 enters the test load 40 through the water inlet pressure sensor 314, the flow sensor 315, the water inlet joint 313, and the fifth solenoid valve 311 after detecting the pressure and flow rate, and provides heat or cold for the test load 40.

[0054] Further, in some embodiments, the outer circulation system 30 further includes a return water joint 316, a return water pressure sensor 317, and a return water temperature sensor 318 sequentially arranged at the return water end of the outer circulation main path 31. After the return water flowing out of the test load 40 passes through the sixth solenoid valve 312, it is led out to the first return water branch 323 and / or the second return water branch 324 via the return water joint 316. The return water pressure sensor 317 and the return water temperature sensor 318 are arranged between the return water joint 316 and the first return water branch 323 and the second return water branch 324 for detecting the return water pressure and the return water temperature.

[0055] Further, in some embodiments, the refrigeration system 10 includes a compressor 11, a condenser 13, and a first refrigerant branch 151 and a second refrigerant branch 152 connected in parallel on the refrigerant flow path. A first evaporator 1512 is provided on the first refrigerant branch 151, and the cold box 211 is connected to the first evaporator 1512; a second evaporator 1522 is provided on the second refrigerant branch 152, and the hot box 221 is connected to the second evaporator 1522.

[0056] Specifically, the inner circulation system 20 is further provided with a cold water circuit 21 and a hot water circuit 22. The first evaporator 1512 is connected to the cold water circuit 21 to provide cooling capacity to the water flow in the cold water circuit 21 through heat exchange, and the cold water after heat exchange flows back into the cold box 211. The second evaporator 1522 is connected to the hot water circuit 22 to provide cooling capacity to the water flow in the hot water circuit 22 through heat exchange, and the hot water after heat exchange flows back into the hot box 221.

[0057] Further, a first heating element 213 is provided in the cold box 211, and a second heating element 223 is provided in the hot box 221. When the water flow in the cold water circuit 21 is cooled, precise temperature control of the cold water is achieved through the combined adjustment of the first evaporator 1512 and the first heating element 213. Its main cooling capacity comes from the heat exchange of the first evaporator 1512, and then the temperature is adjusted by the first heating element 213. When the water flow in the hot water circuit 22 is heated, precise temperature control of the hot water is achieved through the combined adjustment of the second evaporator 1522 and the second heating element 223. Its main heat comes from the heating of the second heating element 223, and then the temperature is adjusted by the second evaporator 1522. It should be noted that the above is only a way in which the heating element and the evaporator cooperate to control the temperature of the cold water circuit 21 and the hot water circuit 22, and it is not regarded as a limitation on its working principle. Its specific adjustment process depends on the set cold water temperature and hot water temperature in the actual test, and will not be elaborated here. In the embodiments of the present application, through the cooperation of the refrigeration system 10 and the heating element, the temperature of the cold water and the hot water is adjusted in real time, and the adjustment accuracy is controlled within ±0.5°C.

[0058] Further, the cold water circuit 21 is also provided with a first water pump 212 for providing power for the water flow in the cold water circuit 21, so that the water in the cold box 211 enters the first evaporator 1512 for heat exchange and then flows back to the cold box 211. The hot water circuit 22 is also provided with a second water pump 222 for providing power for the water flow in the hot water circuit 22, so that the water in the hot box 221 enters the second evaporator 1522 for heat exchange and then flows back to the hot box 221.

[0059] Further, in some embodiments, a first throttle valve 1511 and a first temperature sensor 1513 are further provided on the first refrigerant branch 151, which are respectively arranged at the liquid inlet end and the liquid outlet end of the first evaporator 1512; the first temperature sensor 1513 detects the refrigerant temperature at the liquid outlet end of the first evaporator 1512, and the first throttle valve 1511 adjusts the valve opening of the first throttle valve 1511 according to the refrigerant temperature detected by the first temperature sensor 1513 to control the refrigerant flow rate passing through the first evaporator 1512. Similarly, a second throttle valve 1521 and a second temperature sensor 1523 are further provided on the second refrigerant branch 152, which are respectively arranged at the liquid inlet end and the liquid outlet end of the second evaporator 1522. The second temperature sensor 1523 detects the refrigerant temperature at the liquid outlet end of the second evaporator 1522, and the second throttle valve 1521 adjusts the valve opening of the second throttle valve 1521 according to the refrigerant temperature detected by the second temperature sensor 1523 to control the refrigerant flow rate passing through the second evaporator 1522.

[0060] Further, in some embodiments, the refrigeration system 10 further includes a third refrigerant branch 153 arranged in parallel with the first refrigerant branch 151 and the second refrigerant branch 152, and the third refrigerant branch 153 is used to increase the suction gas temperature of the compressor 11. Similarly, a third throttle valve 1531 is provided on the third refrigerant branch 153. Correspondingly, a third temperature sensor 16 is provided at the suction gas end of the compressor 11 for detecting the suction gas temperature of the compressor 11, and the third throttle valve 1531 adjusts the valve opening according to the suction gas temperature to control the suction gas temperature of the compressor 11 within a certain range.

[0061] Further, in some embodiments, solenoid valves are provided on the first refrigerant branch 151, the second refrigerant branch 152 and the third refrigerant branch 153 to control the opening and closing of these refrigerant branches.

[0062] Further, in some embodiments, the refrigeration system 10 is also provided with an oil separator 12 and a dryer filter 14. The oil separator 12 is arranged at the exhaust end of the compressor 11 for separating the lubricating oil in the high-pressure steam discharged by the compressor 11 to improve the heat transfer effect in the condenser 13 and the evaporator. The dryer filter 14 is arranged between the condenser 13 and the refrigerant branch for filtering out impurities and moisture in the refrigerant to prevent these impurities from clogging the refrigerant branch and several valve components on the refrigerant branch.

[0063] See also Figures 1-3 The test system provided based on the embodiment of the present application can implement testing of the test load 40 in multiple modes, including a standard test mode, a rapid temperature change mode, and a temperature shock mode.

[0064] Furthermore, in the multi-mode hot and cold water circulation test method for automobile parts provided in the embodiment of the present application, in the standard test mode, the cold box 211 provides cold water to the test load 40. In the standard test mode, the first water inlet branch 321 and the first water return branch 323 are connected, and cold water is sucked out through the cold box 211 into the test load 40, and then returned from the test load 40 to the cold box 211, and the cold box circulation is performed.

[0065] Specifically, as a specific implementation method, in the standard test mode, the gas circulation branch 33 is closed, that is, the seventh solenoid valve 3311 and the eighth solenoid valve 3321 are closed; at the same time, the third solenoid valve 3221 is closed, the fourth solenoid valve 3241 is closed, the first solenoid valve 3211, the second solenoid valve 3231, the fifth solenoid valve 311 and the sixth solenoid valve 312 are opened, and the first water inlet branch 321 and the first return water branch 323 are connected. At this time, it is a cold box cycle.

[0066] Furthermore, the rapid temperature change mode includes a rapid temperature change process of cooling and a rapid temperature change process of heating.

[0067] Among them, the specific steps of the cooling and rapid temperature change process are: in the initial state of the hot box cycle, close the second water inlet branch 322, and open the first water inlet branch 321 to make the first water inlet branch 321 and the second water return branch 324 connected, so that the cold water of the cold box 211 returns to the hot box 221 through the test load 40, and switch the flow path after running for a period of time, close the second water return branch 324, and open the first water return branch 323 to connect the first water inlet branch 321 and the first water return branch 323, so that the cold water of the cold box 211 returns to the cold box 211 through the test load 40.

[0068] Specifically, as a specific implementation manner, the initial state of the rapid temperature change process for cooling is the hot box circulation state. At this time, the air circulation branch 33 is closed, that is, the seventh solenoid valve 3311 and the eighth solenoid valve 3321 are closed; the second solenoid valve 3231 and the third solenoid valve 3221 are controlled to be closed, and the first solenoid valve 3211, the fourth solenoid valve 3241, the fifth solenoid valve 311, and the sixth solenoid valve 312 are opened. The first water inlet branch 321 and the second water return branch 324 are conducted to enable the stored water in the flow path to flow back to the hot box 221. When the water return temperature sensor 318 senses that the difference between the water return temperature and the cold water temperature in the cold box 211 is within the set range, the fourth solenoid valve 3241 is closed, and the second solenoid valve 3231 is opened. At this time, the first water inlet branch 321 and the first water return branch 323 are conducted, and the cold water in the flow path flows back to the cold box 211 for cold box circulation. In this way, the hot water remaining in the flow path is first returned to the hot box 221, which can prevent the hot water remaining in the flow path from entering the cold box 211 and affecting the cold water temperature in the cold box 211. After the stored water in the flow path has flowed back, the cold box circulation is carried out, which can improve the cooling efficiency of the test load 40.

[0069] Furthermore, the specific steps of the rapid temperature change process for heating are as follows: in the initial state of the cold box circulation, the first water inlet branch 321 is closed, and the second water inlet branch 322 is opened to enable the second water inlet branch 322 and the first water return branch 323 to be conducted, so that the hot water in the hot box 221 returns to the cold box 211 through the test load 40. After running for a period of time, the flow path is switched, the first water return branch 323 is closed, and the second water return branch 324 is opened to conduct the second water inlet branch 322 and the second water return branch 324, so that the hot water in the hot box 221 returns to the hot box 221 through the test load 40.

[0070] Specifically, as a specific implementation manner, the initial state of the rapid temperature rise and rapid temperature change process is the cold box circulation state. At this time, the gas circulation branch 33 is closed, that is, the seventh solenoid valve 3311 and the eighth solenoid valve 3321 are closed; the first solenoid valve 3211 and the fourth solenoid valve 3241 are controlled to be closed, and the third solenoid valve 3221, the second solenoid valve 3231, the fifth solenoid valve 311, and the sixth solenoid valve 312 are opened. The second water inlet branch 322 and the first water return branch 323 are conducted to enable the water stored in the flow path to flow back into the cold box 211. When the return water temperature sensor 318 senses that the difference between the return water temperature and the hot water temperature in the hot box 221 is within the set range, the second solenoid valve 3231 is closed, and the fourth solenoid valve 3241 is opened. At this time, the second water inlet branch 322 and the second water return branch 324 are conducted, and the hot water in the flow path flows back into the hot box 221 for hot box circulation. Similarly, in this way, the cold water remaining in the flow path is first returned to the cold box 211 to prevent this cold water from mixing into the hot box 221 and affecting the hot water temperature in the hot box 221. After the water stored in the flow path has flowed back, the hot box circulation is carried out to improve the heating efficiency of the test load 40.

[0071] In the multi-mode cold and hot water circulation test method for automotive parts provided by the embodiment of the present application, in the rapid temperature change mode, through the collaborative work of the cold box 211 and the hot box 221, the cold and hot water sources are switched with time delay control, and the temperature change rate can reach 10 °C / min.

[0072] Furthermore, the temperature change shock mode includes a cooling shock process and a heating shock process.

[0073] Among them, the specific steps of the cooling shock process are as follows: First, the water circulation branch 32 is closed, the air inlet branch 331 and the air return branch 332 are conducted, and air is passed to blow the water stored in the test load 40 back to the expansion tank 334 through the air return branch 332. Then, the flow path is switched, and the first water inlet branch 321 and the first water return branch 323 are conducted, so that the cold water in the cold box 211 passes through the test load 40 and returns to the cold box 211 for cold box circulation.

[0074] Specifically, the initial state of the cooling shock process is the hot box circulation state. At this time, the air circulation branch 33 is in the closed state, that is, the seventh solenoid valve 3311 and the eighth solenoid valve 3321 are in the closed state. First, close the water circulation branch 32, that is, close the first solenoid valve 3211, the second solenoid valve 3231, the third solenoid valve 3221, the fourth solenoid valve 3241, the fifth solenoid valve 311, and the sixth solenoid valve 312; then open the air circulation branch 33, that is, open the seventh solenoid valve 3311 and the eighth solenoid valve 3321, the intake branch 331 and the return air branch 332 are conducted, and turn on the air compressor 333 to blow the stored water in the test load 40 back to the expansion tank 334 using compressed air. Then close the air circulation branch 33, that is, close the seventh solenoid valve 3311 and the eighth solenoid valve 3321; then start the cold box circulation, that is, open the first solenoid valve 3211, the second solenoid valve 3231, the fifth solenoid valve 311, and the sixth solenoid valve 312, so that the first water inlet branch 321 and the first water return branch 323 are conducted, and the cold water quickly cools the test load 40. In this way, first blow out the remaining hot water in the test load 40. When switching the water supply of the cold box 211, the cold water directly cools the test load 40 at a lower temperature to perform a cooling shock on it.

[0075] Furthermore, the specific steps of the heating shock process are as follows: close the water circulation branch 32, conduct the intake branch 331 and the return air branch 332, ventilate to blow out the stored water in the test load 40, and then switch the flow path to conduct the second water inlet branch 322 and the second water return branch 324, so that the hot water in the hot box 221 passes through the test load 40 and returns to the hot box 221 for hot box circulation.

[0076] Specifically, the initial state of the heating shock process is the circulating state of the cold box 211. At this time, the gas circulation branch 33 is in the closed state, that is, the seventh solenoid valve 3311 and the eighth solenoid valve 3321 are in the closed state. First, close the water circulation branch 32, that is, close the first solenoid valve 3211, the second solenoid valve 3231, the third solenoid valve 3221, the fourth solenoid valve 3241, the fifth solenoid valve 311, and the sixth solenoid valve 312; then open the gas circulation branch 33, that is, open the seventh solenoid valve 3311 and the eighth solenoid valve 3321, the intake branch 331 and the return air branch 332 are conducted, and turn on the air compressor 333 to blow the stored water in the test load 40 back to the expansion tank 334 using compressed air. Then close the gas circulation branch 33, that is, close the seventh solenoid valve 3311 and the eighth solenoid valve 3321; then start the hot box circulation, that is, open the third solenoid valve 3221, the fourth solenoid valve 3241, the fifth solenoid valve 311, and the sixth solenoid valve 312, so that the second water inlet branch 322 and the second water return branch 324 are conducted, and realize the rapid heating of the test load 40 by hot water. In this way, the cold water remaining in the test load 40 is first blown out. When switching the hot water supply, the hot water can directly heat the test load 40 and perform a heating shock on it.

[0077] The multi-mode cold and hot water circulation test method for automotive parts provided by the embodiment of the present application, in the temperature change shock mode, uses compressed air to quickly drain the liquid in the pipeline, and then switches the cold and hot water sources, and the shock conversion time ≤ 30 seconds.

[0078] Compared with the prior art, the beneficial effects of the embodiment of the present application are as follows:

[0079] (1) By using the cooperation of the refrigeration system and the heating element to accurately control the temperature of the cold box and the hot box, the adjustment accuracy is high;

[0080] (2) By integrating the refrigeration system, the internal circulation system, and the external circulation system, the test system can be compatible with various modes of testing, meet various test requirements, and reduce the floor area and save costs;

[0081] (3) By the linkage switching of multiple solenoid valves to achieve the switching of multiple test modes, the test process is simplified, and at the same time, the heat exchange efficiency of the equipment can be improved;

[0082] (4) By the coordinated operation of the cold box and the hot box, delaying the control to switch the cold and hot water sources to improve the temperature change rate; at the same time, through the water circulation branch and the gas circulation branch controlled by the solenoid valve switching, the shock conversion time is effectively shortened, and the working efficiency of the equipment is improved.

[0083] The above-described embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and the present invention is also intended to cover these modifications and variations.

Claims

1. A multi-mode hot and cold water circulation test system for automobile parts, characterized in that: include: A refrigeration system (10), an internal circulation system (20) and an external circulation system (30), wherein a test load (40) is arranged in the external circulation system (30); the refrigeration system (10) is used to provide cooling for the internal circulation system (20); the internal circulation system (20) is provided with a cold box (211) and a hot box (221) for providing cold water and hot water for the test load (40); The external circulation system (30) is provided with an external circulation main circuit (31) and a water circulation branch circuit (32); the test load (40) is arranged on the external circulation main circuit (31); the water circulation branch circuit (32) comprises a first water inlet branch circuit (321), a second water inlet branch circuit (322), a first water return branch circuit (323) and a second water return branch circuit (324); The first water inlet branch (321) and the second water inlet branch (322) are arranged in parallel on the water inlet side of the external circulation main path (31), and the water inlet end of the first water inlet branch (321) is connected to the cold box (211) for introducing cold water; the water inlet end of the second water inlet branch (322) is connected to the hot box (221) for introducing hot water; The first water return branch (323) and the second water return branch (324) are arranged in parallel on the water return side of the external circulation main circuit (31), and the water outlet end of the first water return branch (323) is connected to the cold box (211); the water outlet end of the second water return branch (324) is connected to the hot box (221).

2. A multi-mode hot and cold water circulation test system for automobile parts according to claim 1, characterized in that: The external circulation system (30) is also provided with an air circulation branch (33); The air circulation branch (33) comprises an air intake branch (331) and an air return branch (332) connected at one end to the external circulation main circuit (31); the air intake branch (331) is arranged on a water inlet side of the test load (40), and the air return branch (332) is arranged on a water return side of the test load (40).

3. A multi-mode hot and cold water circulation test system for automobile parts according to claim 2, characterized in that: The first water inlet branch (321) is provided with a first solenoid valve (3211); the first water return branch (323) is provided with a second solenoid valve (3231); The second water inlet branch (322) is provided with a third solenoid valve (3221); the second water return branch (324) is provided with a fourth solenoid valve (3241); The external circulation main circuit (31) is further provided with a fifth solenoid valve (311) and a sixth solenoid valve (312); the fifth solenoid valve (311) is provided on the water inlet side of the test load (40), and the sixth solenoid valve (312) is provided on the water return side of the test load (40); the air inlet branch circuit (331) is connected to the external circulation main circuit (31) between the fifth solenoid valve (311) and the test load (40); and the air return branch circuit (332) is connected to the external circulation main circuit (31) between the sixth solenoid valve (312) and the test load (40).

4. A multi-mode hot and cold water circulation test system for automobile parts according to claim 2, characterized in that: The air intake branch (331) is provided with a seventh solenoid valve (3311), and the air return branch (332) is provided with an eighth solenoid valve (3321).

5. A multi-mode hot and cold water circulation test system for automobile parts according to claim 2, characterized in that: The external circulation system (30) is further provided with an expansion water tank (334), and the expansion water tank (334) is provided with a water inlet and a water replenishment port, the water inlet is connected to the return air branch (332), and the water replenishment port is simultaneously connected to the cold box (211) and the hot box (221).

6. A multi-mode hot and cold water circulation test system for automobile parts according to claim 1, characterized in that: The refrigeration system (10) includes a compressor (11), a condenser (13), and a first refrigerant branch (151) and a second refrigerant branch (152) arranged in parallel on the refrigerant flow path; a first evaporator (1512) is provided on the first refrigerant branch (151), and the cold box (211) is connected to the first evaporator (1512); a second evaporator (1522) is provided on the second refrigerant branch (152), and the hot box (221) is connected to the second evaporator (1522).

7. A multi-mode hot and cold water circulation test system for automobile parts according to claim 6, characterized in that: The first refrigerant branch (151) is also provided with a first throttle valve (1511) and a first temperature sensor (1513), which are respectively arranged at the liquid inlet and liquid outlet of the first evaporator (1512); The second refrigerant branch (152) is also provided with a second throttle valve (1521) and a second temperature sensor (1523), which are respectively arranged at the liquid inlet and liquid outlet of the second evaporator (1522).

8. A multi-mode hot and cold water cycle test method for automotive parts, characterized in that: A multi-mode hot and cold water cycle test system for automobile parts is used to test a test load (40) in a standard test mode, a rapid temperature change mode or a temperature shock mode.

9. A multi-mode hot and cold water cycle testing method for automobile parts according to claim 8, characterized in that: The rapid temperature change mode includes a rapid temperature change process of cooling and a rapid temperature change process of heating; The test steps of the cooling and rapid temperature change process are as follows: in the initial state of the hot box cycle, the second water inlet branch (322) is closed, the first water inlet branch (321) is opened, the first water inlet branch (321) and the second water return branch (324) are connected, and after running for a period of time, the flow path is switched, the second water return branch (324) is closed, the first water return branch (323) is opened, and the first water inlet branch (321) and the first water return branch (323) are connected; The test steps of the rapid temperature change process of heating are: in the initial state of the cold box cycle, the first water inlet branch (321) is closed, the second water inlet branch (322) is opened, the second water inlet branch (322) and the first water return branch (323) are connected, and after running for a period of time, the flow path is switched, the first water return branch (323) is closed, the second water return branch (324) is opened, and the second water inlet branch (322) and the second water return branch (324) are connected.

10. A multi-mode hot and cold water cycle testing method for automobile parts according to claim 8, characterized in that: The temperature change shock mode includes a temperature drop shock process and a temperature rise shock process; The test steps of the cooling shock process are: closing the water circulation branch (32), connecting the air intake branch (331) and the air return branch (332), blowing out the water in the test load (40), then switching the flow path, connecting the first water intake branch (321) and the first water return branch (323), and performing cold box circulation; The test steps of the temperature rise shock process are: closing the water circulation branch (32), connecting the air intake branch (331) and the air return branch (332), blowing out the water in the test load (40), and then switching the flow path, connecting the second water intake branch (322) and the second water return branch (324), and performing hot box circulation.

Images