Back-transmission engine water pump gear train thermal test bench system

Abstract

The invention provides a back transmission engine water pump gear train thermal test bench system, and belongs to the technical field of engine testing. According to the system, hot test equipment and hot test procedures are simplified, the hot test efficiency is high, the hot test time is shortened, and the management and maintenance cost is reduced. The system comprises a small temperature rise cycle and a large temperature control cycle, an engine is directly communicated with the small temperature rise cycle and connected with the large temperature control cycle through a thermostat, engine starting cooling liquid circularly flows in the small temperature rise cycle, the engine continuously operates after being started, the cooling liquid is heated until the thermostat is started, and the engine is started. And the cooling liquid flows into the temperature control major cycle to keep the temperature stable. According to the system, hot test equipment and procedures are unified, the production remodeling preparation time is shortened, the hot test efficiency is greatly improved, the time cost for disassembling and assembling gear train accessories by workers is saved, the management cost and the maintenance and repair cost of process rotary gear train accessories are saved, and in addition, the development cost and the management cost of workers, mounting, clamping and checking tools are saved.

Description

Technical Field

[0001] The invention belongs to the technical field of engine testing, and in particular relates to a northbound transmission engine water pump gear train thermal test bench system. Background Art

[0002] There are two common water pump transmission modes in the current engine industry, one is forward transmission and the other is reverse transmission. Forward transmission means that the rotation direction of the water pump impeller is the same as the rotation direction of the engine crankshaft, and reverse transmission means that the rotation direction of the water pump impeller is opposite to the rotation direction of the engine crankshaft. According to the specific layout requirements of the engine structure, the engine's water pump power is often designed as a reverse transmission mode.

[0003] The reverse transmission mode needs to be realized by converting the rotation direction of other gear train accessories, that is, all gear train accessories need to be assembled for operation. This is not flexible enough for engine manufacturers to conduct engine testing. When some customers do not need gear train accessories such as air-conditioning compressors and generators, engine manufacturers often need to prepare a large number of process-rotating gear train accessories to realize the test water pump operation. The testing process is cumbersome and the testing cost is high. Summary of the Invention

[0004] In order to solve the deficiencies in the above-mentioned background technology, the present invention provides a back-drive engine water pump gear train hot test bench system, which simplifies the hot test equipment and hot test procedures, has high hot test efficiency, and reduces the hot test time, management and repair and maintenance costs.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: a back-driven engine water pump gear train hot test bench system, including a small temperature-raising cycle and a large temperature-control cycle. The engine is directly connected to the small temperature-raising cycle, and the engine is connected to the large temperature-control cycle through a thermostat. When the engine starts, the coolant circulates in the small temperature-raising cycle. After the engine starts and continues to run, the coolant heats up until the thermostat opens, and the coolant flows into the large temperature-control cycle to maintain a stable temperature.

[0006] The small temperature-raising cycle includes a circulation pipeline, an on-off valve and a reversing valve. A small circulation water inlet and a small circulation water outlet are provided on the engine. The circulation pipeline is connected between the small circulation water inlet and the small circulation water outlet outside the engine. The reversing valve is connected in series to the circulation pipeline through ports A and C. Port B of the reversing valve is connected to the return pipe of the large temperature-control cycle. The on-off valve is connected between the circulation pipeline and the water supply pipe of the large temperature-control cycle.

[0007] The temperature-controlled large circulation includes a radiator, a warm water tank, a stand water pump, a return pipe and a water supply pipe. A large circulation water inlet and a large circulation water outlet are set on the engine. The water supply pipe is connected between the water outlet of the warm water tank and the large circulation water inlet, and the return pipe is connected between the return water outlet of the warm water tank and the large circulation water outlet. The stand water pump is serially arranged on the water supply pipe, and the radiator is serially connected to the return pipe.

[0008] A pressure gauge and a pressure sensor are provided on the water supply pipe. The pressure gauge is installed on the water supply pipe between the bench water pump and the engine, and the pressure sensor is installed on the water supply pipe between the pressure gauge and the engine.

[0009] A temperature sensor is installed on the return pipe between the radiator and the engine.

[0010] The temperature control large cycle also includes an overflow pot, the water inlet end of the overflow pot is connected to the return pipe through a pipeline, the water outlet end of the overflow pot is connected to the water supply pipe through a pipeline, and an exhaust nozzle connected to the outside is provided on the overflow pot.

[0011] A water inlet and an air vent are provided on the top of the warm water tank, an overflow port is provided on the side wall of the warm water tank, a sewage pipe is provided at the bottom of the warm water tank, a liquid level sensor is hoisted in the warm water tank, an electric heater is fixedly installed inside the warm water tank, and a second temperature sensor is installed in the warm water tank.

[0012] The temperature control large cycle also includes a pressure relief pipeline, which is connected in parallel between the water supply pipe and the return pipe.

[0013] The on-off valve is connected between the circulation pipeline and the water supply pipe, and the B port of the reversing valve is connected to the return pipe. During the small cycle of temperature rise, the on-off valve is connected, and the A port and the C port of the reversing valve are connected. During the large cycle of temperature control, the on-off valve is disconnected, and the B port and the C port of the reversing valve are connected.

[0014] The beneficial effects of the present invention are as follows: the system realizes the simple online hot test requirement of the back-drive of the engine water pump without adding corresponding gear train accessories, and there is no need to reserve process gear train accessories, the hot test equipment and procedures are unified, the production changeover preparation time is reduced, the hot test efficiency is greatly improved, and at the same time, the time cost of workers disassembling and assembling gear train accessories, the management cost of process wheel gear train accessories, and the maintenance and repair cost are saved; the system enables the back-drive water pump gear train to achieve hot testing without a compressor or generator, without distinguishing the water pump status, and without separately preparing process demonstration generators, compressors and tooling, which reduces the time for production assembly and disassembly of process gear trains, greatly improves production efficiency, and at the same time saves the development cost and management cost of tooling, fixtures, clamps and inspection tools. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In the attached figure: Figure 1 It is a schematic diagram of the connection relationship between the system components of the present invention; Figure 2 This is a schematic diagram of the engine gear train before the test bench system of the present invention is applied; Figure 3 This is a schematic diagram of the engine gear train after the test bench system of the present invention is applied; In the figure: 1. Engine; 2. On-off valve; 3. Reversing valve; 4. Overflow pot; 5. Temperature sensor 1; 6. Radiator; 7. Warm water tank; 8. Bench water pump; 9. Pressure gauge; 10. Pressure sensor; 11. Return pipe; 12. Liquid level sensor; 13. Temperature sensor 2; 14. Electric heater; 15. Drain pipe; 16. Water supply pipe; 17. Thermostat; 18. Pressure relief line; 21. Crankshaft pulley assembly; 22. Compressor assembly; 23. Automatic tensioner assembly; 24. Water pump assembly; 25. Generator assembly; 26. Drive belt. DETAILED DESCRIPTION

[0016] The present invention will now be further described with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner. Therefore, the drawings only show components related to the present invention.

[0017] A back-drive engine water pump gear train hot test bench system includes a small temperature-raising cycle and a large temperature-control cycle. The engine 1 is directly connected to the small temperature-raising cycle, and the engine 1 is connected to the large temperature-control cycle through a thermostat 17. When the engine 1 is started, the coolant circulates in the small temperature-raising cycle. The coolant quickly heats up to ensure that the engine 1 quickly enters the working state. After the engine 1 is started and continues to run, the coolant heats up until the thermostat 17 opens, and the coolant then flows into the large temperature-control cycle to maintain a stable temperature, thereby maintaining safe and stable operation of the engine 1.

[0018] The small temperature-raising cycle includes a circulation pipeline, an on-off valve 2 and a reversing valve 3. A small circulation water inlet and a small circulation water outlet are provided on the engine 1. The circulation pipeline is connected between the small circulation water inlet and the small circulation water outlet outside the engine 1. The reversing valve 3 is connected in series to the circulation pipeline through ports A and C. Port B of the reversing valve 3 is connected to the return pipe 11 of the large temperature-control cycle. The on-off valve 2 is connected between the circulation pipeline and the water supply pipe 16 of the large temperature-control cycle.

[0019] The temperature-controlled large circulation includes a radiator 6, a warm water tank 7, a stand water pump 8, a return pipe 11 and a water supply pipe 16. A large circulation water inlet and a large circulation water outlet are provided on the engine 1. The water supply pipe 16 is connected between the water outlet of the warm water tank 7 and the large circulation water inlet, and the return pipe 11 is connected between the return water outlet of the warm water tank 7 and the large circulation water outlet. The stand water pump 8 is arranged in series on the water supply pipe 16, and the radiator 6 is connected in series on the return pipe 11. The stand water pump 8 is operated to pump the coolant from the warm water tank 7 to the engine 1. The high-temperature coolant flowing out of the engine 1 flows through the radiator 6 for cooling and then flows back into the warm water tank 7.

[0020] A pressure gauge 9 and a pressure sensor 10 are provided on the water supply pipe 16. The pressure gauge 9 is installed on the water supply pipe 16 between the gantry water pump 8 and the engine 1. The pressure sensor 10 is installed on the water supply pipe 16 between the pressure gauge 9 and the engine 1. The pressure gauge 9 and the pressure sensor 10 cooperate to monitor the supply pressure of the coolant supplied by the water supply pipe 16 to the engine 1.

[0021] A temperature sensor 5 is installed on the return pipe 11 between the radiator 6 and the engine 1. The temperature sensor 5 is used to monitor the return water temperature in the return pipe 11 in the temperature control cycle to coordinate the operating power of the radiator 6.

[0022] The temperature control large cycle also includes an overflow pot 4, the water inlet end of the overflow pot 4 is connected to the return pipe 11 through a pipeline, and the water outlet end of the overflow pot 4 is connected to the water supply pipe 16 through a pipeline. An exhaust nozzle connected to the outside world is provided on the overflow pot 4. The coolant mixed with gas in the return pipe 11 is pushed by the gas to flow into the overflow pot 4, and the gas is discharged from the exhaust nozzle. The coolant that has completed exhaust flows back to the water supply pipe 16 to re-participate in the circulation.

[0023] A water inlet and an air vent are provided on the top of the warm water tank 7, an overflow port is provided on the side wall of the warm water tank 7, a sewage pipe 15 is provided at the bottom of the warm water tank 7, a liquid level sensor 12 is hoisted in the warm water tank 7, an electric heater 14 is fixedly installed inside the warm water tank 7, and a temperature sensor 13 is installed in the warm water tank 7.

[0024] The coolant that has passed through the radiator 6 and completed cooling flows back to the warm water tank 7 through the return pipe 11. The temperature sensor 13 monitors the coolant temperature in the warm water tank 7 in real time. If the temperature meets the standard, the electric heater 14 will not be activated. If the temperature does not meet the standard, the electric heater 14 will be activated to heat the coolant in the warm water tank 7.

[0025] The liquid level sensor 12 arranged in the warm water tank 7 monitors the coolant inventory in the warm water tank 7, and can replenish the liquid in time through the water inlet when the liquid level drops. The warm water tank 7 is provided with an overflow port to avoid excessive replenishment of the warm water tank 7. The vent provided in the warm water tank 7 is used to discharge the gas in the warm water tank 7 to ensure that the pressure in the warm water tank 7 remains stable.

[0026] Impurities generated in the engine 1 due to production and processing enter the warm water tank 7 through the coolant circulation and are precipitated. They are cleaned regularly and discharged from the drain pipe 15 during cleaning, which ensures healthy and stable operation of the system.

[0027] The temperature control large cycle also includes a pressure relief pipe 18, which is connected in parallel between the water supply pipe 16 and the return pipe 11. When blockage occurs in any pipe of the test bench system, the pressure relief pipe 18 is activated to relieve pressure to maintain the stability of the system from being damaged.

[0028] The temperature control large cycle further includes a pressure relief pipeline 18 , which is connected in parallel between the water supply pipe 16 and the return pipe 11 .

[0029] The on-off valve 2 is connected between the circulation pipeline and the water supply pipe 16, and the B port of the reversing valve 3 is connected to the return pipe 11. During the small temperature rise cycle, the on-off valve 2 is connected, and the A port and the C port of the reversing valve 3 are connected. The coolant circulates through the engine 1, prompting the engine 1 to quickly heat up to a stable operating temperature. During the large temperature control cycle, the on-off valve 2 is disconnected, and the B port and the C port of the reversing valve 3 are connected. The coolant circulates through the engine 1 to maintain a stable temperature and avoid the danger of overheating of the engine 1.

[0030] A small ECU computer is connected to the system to realize closed-loop control, monitoring the entire process to ensure that the outlet water temperature is less than or equal to the preset range. If the range is exceeded, the system will alarm to prompt the operator.

[0031] Working principle: Before the system is used, the engine 1 structure to be hot tested needs to be as follows Figure 2 In the state shown, the engine 1 is equipped with a crankshaft pulley assembly 21, a compressor assembly 22, an automatic tensioner assembly 23, a water pump assembly 24, a generator assembly 25 and a drive belt 26.

[0032] When the crankshaft pulley assembly 21 rotates clockwise, the compressor assembly 22, the automatic tensioner assembly 23, the water pump assembly 24 and the generator assembly 25 are driven to rotate through the transmission belt 26. The counterclockwise rotation of the water pump assembly 24 is called back transmission, and the remaining components rotate clockwise.

[0033] When the compressor assembly 22 and the generator assembly 25 are removed, the crankshaft pulley assembly 21 and the automatic tensioner assembly 23 alone cannot drive the water pump assembly 24 to rotate counterclockwise. When the water pump assembly 24 does not rotate, the engine 1 will not be able to supply coolant, which will affect the hot test of the engine 1 during the production process and cause damage to the engine 1.

[0034] After the system is used, the structure of the engine 1 undergoing the hot test is as follows Figure 3 In the state shown, the compressor assembly 22, the generator assembly 25 and the drive belt 26 are omitted, and a water pump-free bench hot test is performed.

[0035] Because there is no drive belt 26, the water pump assembly 24 does not operate, and the water circulation of the engine 1 hot test depends entirely on this system. During the hot test, the system is directly connected to the engine 1 through the water channel, and the bench water pump 8 operates to provide water circulation power for the engine 1 hot test.

[0036] When customers request to provide their own generators and compressors, the engine manufacturer needs to remove the generator assembly, compressor assembly and other components on the original machine during production. When the engine 1 with some components removed is subjected to a hot test, it is necessary to set up process gear train accessories for the removed parts, and reinstall the process gear train accessories to perform the hot test process. After the hot test is completed, the process gear train accessories are removed, resulting in a complicated and inefficient entire hot test process, which increases costs.

[0037] After adopting the system disclosed in the present invention, the engine 1 can be subjected to a hot test without assembling process gear train accessories. An external water circulation is used to forcibly input water to the engine 1, and the engine water inlet pressure, water outlet temperature and other data are adjusted and monitored, thereby realizing a forced cooling cycle, avoiding problems such as overheating and damage of the engine 1 due to lack of driving force of the water pump assembly 24 during the hot test. There is no need to reserve process gear train accessories, hot test equipment and procedures are unified, production changeover preparation time is reduced, hot test efficiency is greatly improved, and at the same time, the time cost of workers disassembling and assembling gear train accessories, the management cost of process wheel gear train accessories, and maintenance and repair costs are saved.

[0038] It will be understood that the present invention is described by way of some embodiments, and it will be appreciated by those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. A back-drive engine water pump gear train thermal test bench system, characterized by: The invention comprises a small temperature-raising cycle and a large temperature-control cycle. The engine (1) is directly connected to the small temperature-raising cycle, and the engine (1) is connected to the large temperature-control cycle via a thermostat (17). When the engine (1) is started, the coolant circulates in the small temperature-raising cycle. After the engine (1) is started and continues to operate, the coolant is heated until the thermostat (17) opens, and the coolant then flows into the large temperature-control cycle to maintain a stable temperature.

2. The back-drive engine water pump gear train thermal test bench system according to claim 1, characterized in that: The temperature-raising small cycle includes a circulation pipeline, an on-off valve (2) and a reversing valve (3). The engine (1) is provided with a small circulation water inlet and a small circulation water outlet. The circulation pipeline is connected between the small circulation water inlet and the small circulation water outlet outside the engine (1). The reversing valve (3) is connected in series to the circulation pipeline through ports A and C. Port B of the reversing valve (3) is connected to a return pipe (11) of a temperature-control large cycle. The on-off valve (2) is connected between the circulation pipeline and a water supply pipe (16) of the temperature-control large cycle.

3. The back-drive engine water pump gear train thermal test bench system according to claim 2, characterized in that: The temperature-controlled large circulation includes a radiator (6), a warm water tank (7), a stand water pump (8), a return pipe (11) and a water supply pipe (16). A large circulation water inlet and a large circulation water outlet are provided on the engine (1). The water supply pipe (16) is connected between the water outlet of the warm water tank (7) and the large circulation water inlet through water flow, and the return pipe (11) is connected between the return water outlet of the warm water tank (7) and the large circulation water outlet through water flow. The stand water pump (8) is connected in series to the water supply pipe (16), and the radiator (6) is connected in series to the return pipe (11).

4. The back-drive engine water pump gear train thermal test bench system according to claim 3, characterized in that: A pressure gauge (9) and a pressure sensor (10) are provided on the water supply pipe (16); the pressure gauge (9) is installed on the water supply pipe (16) between the bench water pump (8) and the engine (1); and the pressure sensor (10) is installed on the water supply pipe (16) between the pressure gauge (9) and the engine (1).

5. The back-drive engine water pump gear train thermal test bench system according to claim 4, characterized in that: A temperature sensor (5) is installed on the return water pipe (11) between the radiator (6) and the engine (1).

6. The back-drive engine water pump gear train thermal test bench system according to claim 5, characterized in that: The temperature control large cycle also includes an overflow pot (4), the water inlet end of the overflow pot (4) is connected to the return pipe (11) through a pipeline, the water outlet end of the overflow pot (4) is connected to the water supply pipe (16) through a pipeline, and an exhaust nozzle connected to the outside is provided on the overflow pot (4).

7. The back-drive engine water pump gear train thermal test bench system according to claim 6, characterized in that: The top of the warm water tank (7) is provided with a water inlet and an air outlet, the side wall of the warm water tank (7) is provided with an overflow outlet, the bottom of the warm water tank (7) is provided with a sewage pipe (15), a liquid level sensor (12) is hoisted in the warm water tank (7), an electric heater (14) is fixedly installed inside the warm water tank (7), and a second temperature sensor (13) is installed in the warm water tank (7).

8. The back-drive engine water pump gear train thermal test bench system according to claim 7, characterized in that: The temperature control large cycle further comprises a pressure relief pipeline (18), and the pressure relief pipeline (18) is connected in parallel between the water supply pipe (16) and the return pipe (11).

9. The back-drive engine water pump gear train thermal test bench system according to claim 3 or 8, characterized in that: The on-off valve (2) is connected between the circulation pipeline and the water supply pipe (16), and the B port of the reversing valve (3) is connected to the return pipe (11). During the small temperature-raising cycle, the on-off valve (2) is connected, and the A port and the C port of the reversing valve (3) are connected. During the large temperature-control cycle, the on-off valve (2) is disconnected, and the B port and the C port of the reversing valve (3) are connected.

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