Temperature control system and working machine

Abstract

The application discloses a temperature control system and engineering machinery, the system adopts the first main pump to supply oil to the anti-freezing liquid radiator motor, thereby driving the anti-freezing liquid radiator fan to rotate, the second main pump supplies oil to the hydraulic oil radiator motor, thereby driving the hydraulic oil radiator fan to rotate, the oil circuit formed by the first main pump and the anti-freezing liquid radiator motor and the oil circuit formed by the second main pump and the hydraulic oil radiator motor are provided with the first reversing valve, the one-way valve preventing back oil is arranged between the first reversing valve and the first main pump and the second main pump, the first main pump supplies oil to the hydraulic oil radiator motor or the second main pump supplies oil to the anti-freezing liquid radiator motor by switching the valve core working position of the first reversing valve; the engineering machinery comprises the temperature control system described above. The application provides a temperature control system and engineering machinery, which can not only independently adjust the temperature of the anti-freezing liquid and the hydraulic oil, but also can realize the oil quantity redistribution of two oil circuits through the reversing valve, thereby improving the reliability and working efficiency of the system.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery, and in particular to a temperature control system and engineering machinery. Background Technology

[0002] Construction machinery such as excavators contain power systems that use antifreeze and hydraulic systems that use hydraulic oil. During operation, the temperature of the antifreeze and hydraulic oil gradually increases. When the temperature exceeds the upper limit of the design range of the construction machinery, it is necessary to stop the machine for a period of time to cool it down, which significantly affects the continuity of operation and reduces work efficiency. Existing temperature control systems include radiators that dissipate heat from the antifreeze and hydraulic oil. The engine drives an oil pump, which in turn drives a motor to rotate, thereby rotating a fan connected to the motor to dissipate heat from the radiator.

[0003] Chinese patent application No. 202111132480.3 discloses an independent temperature control system for a dual-power hydraulic excavator. This system uses an engine connected to a first main pump to drive a fan motor for the independent hydraulic oil radiator, which in turn rotates the hydraulic oil cooling fan to cool the radiator. Alternatively, it uses an electric motor connected to a second main pump to drive a fan motor for the independent hydraulic oil radiator, which in turn rotates the cooling fan to cool the radiator. This application uses two separate systems to cool the hydraulic oil, but does not cool the coolant. Furthermore, only one of these systems operates at a time, resulting in resource waste and space occupation.

[0004] Chinese utility model patent application number 201520634277.X discloses a fan-driven hydraulic system for loaders. Although the patent sets temperature sensors to collect temperature signals of coolant and hydraulic oil separately, it uses a single temperature control system and does not separate the cooling of coolant and hydraulic oil. This makes it difficult to ensure that the temperature of antifreeze and hydraulic oil are within an efficient temperature range, and adjustment is also inconvenient.

[0005] In addition, when the excavator's antifreeze cooling motor or hydraulic oil cooling motor experiences a sharp decrease in efficiency or malfunctions, the temperature of the antifreeze or hydraulic oil rises rapidly, making the entire vehicle unable to operate normally. If this malfunction occurs in a space-constrained location, it will cause considerable difficulty in moving the vehicle. Summary of the Invention

[0006] Purpose of the invention: The purpose of this invention is to provide a temperature control system and engineering machinery that can adjust the temperature of antifreeze and hydraulic oil separately while redistributing the oil volume of the two oil circuits, thereby improving the reliability of the system.

[0007] Technical Solution: To achieve the above objectives, the present invention provides a temperature control system in which a first main pump supplies oil to an antifreeze cooling motor, thereby driving the antifreeze radiator fan to rotate; and a second main pump supplies oil to a hydraulic oil cooling motor, thereby driving the hydraulic oil cooling motor fan to rotate. A first directional valve is provided between the oil circuit formed by the first main pump and the antifreeze cooling motor and the oil circuit formed by the second main pump and the hydraulic oil cooling motor. A one-way valve to prevent backflow is provided between the first directional valve and both the first and second main pumps. By switching the working position of the valve core of the first directional valve, the first main pump supplies oil to the hydraulic oil cooling motor or the second main pump supplies oil to the antifreeze cooling motor.

[0008] The antifreeze radiator fan corresponds to the antifreeze radiator, and the antifreeze radiator is connected to the power system; an antifreeze temperature sensor is provided between the antifreeze radiator and the power system; the hydraulic oil radiator fan corresponds to the hydraulic oil radiator, and the hydraulic oil radiator is connected to the hydraulic system.

[0009] The first main pump and the second main pump are driven by the engine. A first electronically controlled stepless speed regulation device and a second electronically controlled stepless speed regulation device are respectively provided between the engine and the first main pump and the second main pump, so that the speed of the first main pump and the second main pump is greater than the speed of the engine.

[0010] Specifically, a second reversing valve and a third reversing valve are respectively installed between the first reversing valve and the antifreeze cooling motor and the hydraulic oil cooling motor. The first reversing valve, the second reversing valve, and the third reversing valve are all three-position four-way proportional reversing valves. A first pressure sensor is installed between the second reversing valve and the antifreeze cooling motor, and a second pressure sensor is installed between the third reversing valve and the hydraulic oil cooling motor, which are used to monitor the oil pressure of each oil circuit.

[0011] The hydraulic oil tank is equipped with a hydraulic oil temperature sensor. The antifreeze temperature sensor, the hydraulic oil temperature sensor, the first electronically controlled stepless speed regulation device, the second electronically controlled stepless speed regulation device, the first main pump, and the second main pump are respectively connected to the controller. The oil outlet T of the second reversing valve and the third reversing valve, and the oil inlet of the first main pump and the second main pump are connected to the external hydraulic oil tank.

[0012] When the first main pump suddenly fails during operation, the antifreeze cooling motor generates negative pressure due to the sudden oil cut-off. The first pressure sensor will detect the negative pressure. When the controller controls the first main pump normally and detects the negative pressure in the antifreeze cooling motor, it will determine that the first main pump is damaged. At this time, the first directional valve will be switched to the upper position, and the second main pump will supply oil to the antifreeze cooling motor through the R1 to R3 ports of the first directional valve. When the second main pump suddenly fails during operation, the hydraulic oil cooling motor generates negative pressure due to the sudden oil cut-off. The second pressure sensor will detect the negative pressure. When the controller controls the second main pump normally and detects the negative pressure in the hydraulic oil cooling motor, it will determine that the second main pump is damaged. At this time, the first directional valve will be switched to the lower position, and the first main pump will supply oil to the hydraulic oil cooling motor through the R3 to R1 ports of the first directional valve.

[0013] Wherein, the optimal operating temperature range of the antifreeze is T1, the optimal operating temperature range of the hydraulic oil is T2, the minimum temperature of the antifreeze is Tf, the maximum temperature is TF, the minimum temperature of the hydraulic oil is Ty, and the maximum temperature is TY. <T1<TF,Ty<T2<TY;

[0014] When the antifreeze temperature sensor detects that the antifreeze temperature is lower than Tf and the hydraulic oil temperature sensor detects that the hydraulic oil temperature is lower than Ty, the second and third directional valves are switched to the left position. This causes the first main pump to supply oil to the antifreeze cooling motor through port P and port B of the second directional valve, and the second main pump to supply oil to the hydraulic oil cooling motor through port P and port A of the third directional valve. This causes the antifreeze radiator fan and the hydraulic oil radiator fan to reverse, blowing hot air from the engine to the radiator, increasing the radiator temperature, and thus increasing the temperature of the antifreeze and hydraulic oil.

[0015] When the antifreeze temperature sensor detects that the antifreeze temperature is higher than TF, and the hydraulic oil temperature sensor detects that the hydraulic oil temperature is higher than TY, the second and third directional valves are in the right position. The first main pump supplies oil to the antifreeze cooling motor through ports P and A of the second directional valve, and the second main pump supplies oil to the hydraulic oil cooling motor through ports P and B of the third directional valve. This drives the antifreeze radiator fan and the hydraulic oil radiator fan to rotate forward, respectively. The controller activates the first and second electronically controlled continuously variable speed transmissions to increase the speed of the first and second main pumps. At the same time, the controller increases the oil supply of the first and second main pumps, thereby increasing the rotational speed of the antifreeze cooling motor and the hydraulic oil cooling motor.

[0016] Specifically, when the antifreeze temperature sensor detects that the antifreeze temperature is higher than Tf and lower than T1, and the hydraulic oil temperature sensor detects that the hydraulic oil temperature is higher than Ty and lower than T2, the second and third directional valves are in the right position. The controller reduces the oil supply of the first and second main pumps, thereby reducing the forward rotation speed of the antifreeze cooling motor and the hydraulic oil cooling motor; or it controls the amount of oil flowing through the motor by adjusting the valve core opening of the second and third directional valves, thereby reducing the forward rotation speed of the antifreeze cooling motor and the hydraulic oil cooling motor; or it switches the second and third directional valves to the neutral position, causing the antifreeze cooling motor and the hydraulic oil cooling motor to stop working.

[0017] When the antifreeze temperature sensor detects that the antifreeze temperature is higher than T1 and lower than TF, and the hydraulic oil temperature sensor detects that the hydraulic oil temperature is higher than T2 and lower than TY, the second and third directional valves are in the right position. The controller increases the oil supply of the first and second main pumps, thereby increasing the forward rotation speed of the antifreeze cooling motor and the hydraulic oil cooling motor.

[0018] Specifically, when the antifreeze temperature sensor detects that the antifreeze temperature is lower than Tf and the hydraulic oil temperature sensor detects that the hydraulic oil temperature is higher than T2, the second directional valve is switched to the left position, causing the first main pump to drive the antifreeze radiator fan to reverse. When the third directional valve is in the right position, the second main pump drives the hydraulic oil cooling motor to rotate forward. At the same time, the first directional valve is switched to the upper position, and the second main pump supplies oil to the antifreeze cooling motor through the R1 to R3 oil ports of the first directional valve, thereby increasing the rotation speed of the antifreeze radiator fan in reverse.

[0019] When the antifreeze temperature sensor detects that the antifreeze temperature is higher than Tf and lower than T1, and the hydraulic oil temperature sensor detects that the hydraulic oil temperature is higher than T2, the second directional valve switches to the middle position, the third directional valve is in the right position, the second main pump drives the hydraulic oil cooling motor to rotate forward, and at the same time switches the first directional valve to the lower position. The first main pump supplies oil to the hydraulic oil cooling motor through the R3 oil port to the R1 oil port of the first directional valve, thereby increasing the rotation speed of the hydraulic oil cooling motor.

[0020] When the antifreeze temperature sensor detects that the antifreeze temperature is higher than T1 and the hydraulic oil temperature sensor detects that the hydraulic oil temperature is lower than Ty, the second directional valve moves to the right position, causing the first main pump to drive the antifreeze radiator fan to rotate forward. The third directional valve is switched to the left position, causing the second main pump to drive the hydraulic oil cooling motor to rotate in reverse. At the same time, the first directional valve is switched to the upper position, and the second main pump supplies oil to the antifreeze cooling motor through the R3 port to the R1 port of the first directional valve, thereby increasing the rotation speed of the hydraulic oil cooling motor in reverse.

[0021] When the antifreeze temperature sensor detects that the antifreeze temperature is higher than T1, and the hydraulic oil temperature sensor detects that the hydraulic oil temperature is higher than Ty but lower than T2, the third directional valve is in the neutral position, the second directional valve is switched to the right position, the first main pump drives the antifreeze cooling motor to rotate forward, and at the same time, the first directional valve is switched to the upper position, and the second main pump supplies oil to the antifreeze cooling motor through the R1 to R3 oil ports of the first directional valve, thereby increasing the rotation speed of the antifreeze cooling motor.

[0022] When the antifreeze temperature sensor detects the antifreeze temperature at T1 and the hydraulic oil temperature sensor detects the hydraulic oil temperature at T2, the second and third directional valves remain in the right position, the first directional valve remains in the middle position, and the oil discharge and speed of the first and second main pumps remain unchanged.

[0023] When the antifreeze temperature sensor detects the antifreeze temperature at T1, and the hydraulic oil temperature sensor detects the hydraulic oil temperature higher than T2 but lower than TY, the second and third directional valves remain in the right position, the first directional valve remains in the middle position, the oil supply and speed of the first main pump remain unchanged, and the oil supply of the second main pump is increased; when the hydraulic oil temperature is greater than TY, the second electronically controlled continuously variable transmission is activated to increase the speed of the second main pump, thereby increasing the forward rotation speed of the hydraulic oil cooling motor.

[0024] When the antifreeze temperature sensor detects that the antifreeze temperature is at T1 and the hydraulic oil temperature sensor detects that the hydraulic oil temperature is lower than T2, the second directional valve remains in the right position, the first directional valve remains in the middle position, the oil supply and speed of the first main pump remain unchanged, the third directional valve switches to the left position, and at the same time increases the oil supply of the second main pump.

[0025] When the antifreeze temperature sensor detects that the antifreeze temperature is lower than T1 and the hydraulic oil temperature sensor detects that the hydraulic oil temperature is at T2, the third directional valve remains in the right position, the first directional valve is in the middle position, the second directional valve switches to the left position, the oil supply and speed of the second main pump remain unchanged, and the oil supply of the first main pump is increased at the same time.

[0026] When the antifreeze temperature sensor detects that the antifreeze temperature is higher than T1, and the hydraulic oil temperature sensor detects that the hydraulic oil temperature is at T2, the second and third directional valves remain in the right position, the first directional valve remains in the middle position, the oil supply and speed of the second main pump remain unchanged, and the oil supply of the first main pump is increased. When the antifreeze temperature is higher than TF, the first electronically controlled stepless speed regulation device is activated to increase the speed of the first main pump, thereby increasing the forward rotation speed of the antifreeze cooling motor.

[0027] The present invention also provides an engineering machine that uses the temperature control system described above.

[0028] Beneficial effects: The present invention has the following advantages: 1. The present invention uses independent main pumps and motors to drive the antifreeze radiator fan and the hydraulic oil radiator fan, and a first reversing valve is set between the two oil circuits. When the first reversing valve is closed, the system has the function of independently regulating the temperature of the antifreeze and hydraulic oil. When one of the main pumps fails, the first reversing valve is opened, which enables the other main pump to supply oil to the two motors at the same time, preventing the problem that the corresponding radiator will heat up rapidly due to the failure of one of the main pumps, thus making the engineering vehicle unable to work, and improving the reliability of the system;

[0029] 2. When the temperature difference between antifreeze and hydraulic oil is large, the flow rate through the two motors can be redistributed through the first directional valve to adjust the speed and improve the system's heat dissipation efficiency and utilization.

[0030] 3. An electronically controlled stepless speed regulation device is added between the engine and the main pump that drives the antifreeze radiator fan. When the temperature of the antifreeze or hydraulic oil rises rapidly, the main pump speed can be made to be greater than the engine speed, and the speed ratio can be adjusted steplessly, thereby increasing the motor speed to drive the fan speed and improving the fault response capability.

[0031] 4. This invention can adjust the temperature of antifreeze and hydraulic oil by combining methods such as changing the direction of motor rotation, the oil supply of the main pump, the speed of the main pump, and redistributing the oil volume of the two oil circuits through the first reversing valve, so that the antifreeze and hydraulic oil work within the optimal temperature range according to the actual working conditions. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0033] The technical solution of the present invention will be described in detail below with reference to the embodiments and accompanying drawings.

[0034] like Figure 1 As shown, the temperature control system of the present invention uses two oil circuits to regulate the temperature of antifreeze and hydraulic oil respectively. One oil circuit uses a first main pump 14 to supply oil to the antifreeze cooling motor 8, thereby driving the antifreeze radiator fan 6 to rotate. The antifreeze radiator fan 6 corresponds to the antifreeze radiator 4, and the antifreeze radiator 4 is connected to the power system 1. The other oil circuit uses a second main pump 16 to supply oil to the hydraulic oil cooling motor 9, thereby driving the hydraulic oil cooling fan 7 to rotate. The hydraulic oil cooling fan 7 corresponds to the hydraulic oil radiator 5, and the hydraulic oil radiator 5 is connected to the hydraulic system 2.

[0035] A first directional valve 19 is provided between the oil circuit formed by the first main pump 14 and the antifreeze cooling motor 8 and the oil circuit formed by the second main pump 16 and the hydraulic oil cooling motor 9. A one-way valve 20 to prevent backflow is provided between the first directional valve 19 and the first main pump 14 and the second main pump 16. By switching the working position of the valve core of the first directional valve 19, the first main pump 14 can supply oil to the hydraulic oil cooling motor 9 or the second main pump 16 can supply oil to the antifreeze cooling motor 8.

[0036] The first main pump 14 and the second main pump 16 are driven by the engine 18. A first electronically controlled stepless speed regulation device 13 and a second electronically controlled stepless speed regulation device 15 are respectively provided between the engine 18 and the first main pump 14 and the second main pump 16, which can steplessly adjust the speed ratio between the engine 18 and the main pump, so that the speed of the first main pump 14 and the second main pump 16 is greater than the speed of the engine 18.

[0037] A second reversing valve 11 and a third reversing valve 12 are respectively provided between the first reversing valve 19 and the antifreeze cooling motor 8 and the hydraulic oil cooling motor 9. The first reversing valve 19, the second reversing valve 11, and the third reversing valve 12 are all three-position four-way proportional reversing valves. A first pressure sensor 21 is provided between the second reversing valve 11 and the antifreeze cooling motor 8, and a second pressure sensor 22 is provided between the third reversing valve 12 and the hydraulic oil cooling motor 9, which are used to monitor the oil pressure of each oil circuit.

[0038] An antifreeze temperature sensor 3 is installed between the antifreeze radiator 4 and the power system 1, and a hydraulic oil temperature sensor 17 is installed in the hydraulic oil tank. The antifreeze temperature sensor 3, the hydraulic oil temperature sensor 17, the first electronically controlled continuously variable transmission 13, the first main pump 14, the second electronically controlled continuously variable transmission 15, and the second main pump 16 are respectively connected to the controller 10. The oil outlet T of the second reversing valve 11 and the third reversing valve 12, and the oil inlet of the first main pump 14 and the second main pump 16 are connected to the external hydraulic oil tank.

[0039] When the first main pump 14 is suddenly damaged during operation, a negative pressure is generated in the antifreeze cooling motor 8 due to sudden fuel cut-off. The first pressure sensor 21 will detect the negative pressure. When the controller 10 normally controls the first main pump 14 and detects the negative pressure in the antifreeze cooling motor 8, it will determine that the first main pump 14 is damaged. At this time, the first directional valve 19 will be switched to the upper position, and the second main pump 16 will supply oil to the antifreeze cooling motor 8 through the R1 port to the R3 port of the first directional valve 19, so as to continuously control the temperature of the antifreeze. When the second main pump 16 is suddenly damaged during operation, a negative pressure is generated in the hydraulic oil cooling motor 9 due to sudden fuel cut-off. The second pressure sensor 22 will detect the negative pressure. When the controller 10 normally controls the second main pump 16 and detects the negative pressure in the hydraulic oil cooling motor 9, it will determine that the second main pump 16 is damaged. At this time, the first directional valve 19 will be switched to the lower position, and the first main pump 14 will supply oil to the hydraulic oil cooling motor 9 through the R3 port to the R1 port of the first directional valve 19, so as to continuously control the temperature of the hydraulic oil, preventing the problem that the corresponding radiator rapidly heats up due to the failure of one of the main pumps, resulting in the inability of the engineering vehicle to work, and improving the reliability of the system.

[0040] Let the optimal operating temperature range of the antifreeze be T1, the optimal operating temperature range of the hydraulic oil be T2, the lowest temperature of the antifreeze be Tf, the highest temperature be TF, the lowest temperature of the hydraulic oil be Ty, and the highest temperature be TY. Tf < T1 < TF, Ty < T2 < TY. Based on the detection of the temperatures of the antifreeze and hydraulic oil by the temperature sensors, this system adjusts the temperatures of the antifreeze and hydraulic oil by changing the rotation direction of the motor, the oil supply volume of the main pump, the rotational speed of the main pump, and redistributing the oil volumes of the two oil circuits through the first directional valve 19. The specific implementation methods are as follows:

[0041] When the antifreeze temperature sensor 3 detects that the antifreeze temperature is lower than Tf and the hydraulic oil temperature sensor 17 detects that the hydraulic oil temperature is lower than Ty, the second directional valve 11 and the third directional valve 12 are switched to the left position, respectively causing the first main pump 14 to supply oil to the antifreeze cooling motor 8 through the P port and the B port of the second directional valve 11 in sequence, and the second main pump 16 to supply oil to the hydraulic oil cooling motor 9 through the P port and the A port of the third directional valve 12 in sequence, thereby respectively driving the antifreeze radiator fan 6 and the hydraulic oil radiator fan 7 to rotate in the reverse direction, blowing the hot air at the engine 18 to the radiator, increasing the temperature of the radiator, and thus increasing the temperatures of the antifreeze and the hydraulic oil. The forward rotation of the fan can suck the cool air into the radiator to cool the radiator, and the reverse rotation of the fan can blow the hot air near the engine to the radiator to increase the temperature of the radiator.

[0042] When the antifreeze temperature sensor 3 detects that the antifreeze temperature is higher than TF, and the hydraulic oil temperature sensor 17 detects that the hydraulic oil temperature is higher than TY, the second reversing valve 11 and the third reversing valve 12 are in the right position. The first main pump 14 supplies oil to the antifreeze cooling motor 8 through the oil port P and oil port A of the second reversing valve 11 in sequence, and the second main pump 16 supplies oil to the hydraulic oil cooling motor 9 through the oil port P and oil port B of the third reversing valve 12 in sequence. This drives the antifreeze radiator fan 6 and the hydraulic oil radiator fan 7 to rotate forward, respectively. The controller 10 makes the first electronically controlled stepless speed regulating device 13 and the second electronically controlled stepless speed regulating device 15 work to increase the speed of the first main pump 14 and the second main pump 16. At the same time, the controller 10 makes the first main pump 14 and the second main pump 16 increase the oil supply, thereby increasing the rotation speed of the antifreeze cooling motor 8 and the hydraulic oil cooling motor 9.

[0043] When the antifreeze temperature sensor 3 detects that the antifreeze temperature is higher than Tf and lower than T1, and the hydraulic oil temperature sensor 17 detects that the hydraulic oil temperature is higher than Ty and lower than T2, the second directional valve 11 and the third directional valve 12 are in the right position. The controller 10 reduces the oil supply of the first main pump 14 and the second main pump 16, thereby reducing the forward rotation speed of the antifreeze cooling motor 8 and the hydraulic oil cooling motor 9; or the controller adjusts the valve core opening of the second directional valve 11 and the third directional valve 12 to control the amount of oil flowing through the motor, thereby reducing the forward rotation speed of the antifreeze cooling motor 8 and the hydraulic oil cooling motor 9; or the controller switches the second directional valve 11 and the third directional valve 12 to the neutral position, thereby stopping the antifreeze cooling motor 8 and the hydraulic oil cooling motor 9 from working.

[0044] When the antifreeze temperature sensor 3 detects that the antifreeze temperature is higher than T1 and lower than TF, and the hydraulic oil temperature sensor 17 detects that the hydraulic oil temperature is higher than T2 and lower than TY, the second reversing valve 11 and the third reversing valve 12 are in the right position. The controller 10 increases the oil supply of the first main pump 14 and the second main pump 16, thereby increasing the forward rotation speed of the antifreeze cooling motor 8 and the hydraulic oil cooling motor 9.

[0045] When the antifreeze temperature sensor 3 detects that the antifreeze temperature is lower than Tf, and the hydraulic oil temperature sensor 17 detects that the hydraulic oil temperature is higher than T2, the second directional valve 11 is switched to the left position, causing the first main pump 14 to drive the antifreeze radiator fan 6 to reverse. The third directional valve 12 is in the right position, and the second main pump 16 drives the hydraulic oil cooling motor 9 to rotate forward. At the same time, the first directional valve 19 is switched to the upper position, and the second main pump 16 supplies oil to the antifreeze cooling motor 8 through the R1 to R3 oil ports of the first directional valve 19, thereby increasing the rotation speed of the antifreeze radiator fan 6 in reverse.

[0046] When the antifreeze temperature sensor 3 detects that the antifreeze temperature is higher than Tf but lower than T1, and the hydraulic oil temperature sensor 17 detects that the hydraulic oil temperature is higher than T2, the second directional valve 11 switches to the neutral position, the third directional valve 12 is in the right position, the second main pump 16 drives the hydraulic oil cooling motor 9 to rotate forward, and at the same time switches the first directional valve 19 to the lower position. The first main pump 14 supplies oil to the hydraulic oil cooling motor 9 through the R3 port to the R1 port of the first directional valve 19, thereby increasing the rotation speed of the hydraulic oil cooling motor 9.

[0047] When the antifreeze temperature sensor 3 detects that the antifreeze temperature is higher than T1 and the hydraulic oil temperature sensor 17 detects that the hydraulic oil temperature is lower than Ty, the second reversing valve 11 moves to the right position, causing the first main pump 14 to drive the antifreeze radiator fan 6 to rotate forward. The third reversing valve 12 is switched to the left position, causing the second main pump 16 to drive the hydraulic oil cooling motor 9 to rotate in reverse. At the same time, the first reversing valve 19 is switched to the lower position, and the second main pump 16 supplies oil to the hydraulic oil cooling motor 9 through the R3 oil port to the R1 oil port of the first reversing valve 19, thereby increasing the rotation speed of the hydraulic oil cooling motor 9 in reverse rotation.

[0048] When the antifreeze temperature sensor 3 detects that the antifreeze temperature is higher than T1, and the hydraulic oil temperature sensor 17 detects that the hydraulic oil temperature is higher than Ty but lower than T2, the third directional valve 12 is in the neutral position, the second directional valve 11 is switched to the right position, the first main pump 14 drives the antifreeze cooling motor 8 to rotate forward, and at the same time switches the first directional valve 19 to the upper position. The second main pump 16 supplies oil to the antifreeze cooling motor 8 through the R1 to R3 oil ports of the first directional valve 19, thereby increasing the rotation speed of the antifreeze cooling motor 8.

[0049] When the antifreeze temperature sensor 3 detects the antifreeze temperature at T1 and the hydraulic oil temperature sensor 17 detects the hydraulic oil temperature at T2, the second directional valve 11 and the third directional valve 12 remain in the right position, the first directional valve 19 remains in the middle position, and the oil discharge and speed of the first main pump 14 and the second main pump 16 remain unchanged, thereby maintaining the antifreeze and hydraulic oil temperatures within the range of T1 and T2.

[0050] When the antifreeze temperature sensor 3 detects that the antifreeze temperature is at T1, and the hydraulic oil temperature sensor 17 detects that the hydraulic oil temperature is higher than T2 but lower than TY, the second directional valve 11 and the third directional valve 12 remain in the right position, the first directional valve 19 remains in the middle position, the oil supply and speed of the first main pump 14 remain unchanged, and the oil supply of the second main pump 16 is increased; when the hydraulic oil temperature is >TY, the second electronically controlled continuously variable transmission device 15 is started to increase the speed of the second main pump 16, thereby increasing the forward rotation speed of the hydraulic oil cooling motor 9;

[0051] When the antifreeze temperature sensor 3 detects that the antifreeze temperature is at T1 and the hydraulic oil temperature sensor 17 detects that the hydraulic oil temperature is lower than T2, the second directional valve 11 remains in the right position, the first directional valve 19 remains in the middle position, the oil supply and speed of the first main pump 14 remain unchanged, the third directional valve 12 switches to the left position, and at the same time increases the oil supply of the second main pump 16.

[0052] When the antifreeze temperature sensor 3 detects that the antifreeze temperature is lower than T1 and the hydraulic oil temperature sensor 17 detects that the hydraulic oil temperature is at T2, the third directional valve 12 remains in the right position, the first directional valve 19 is in the middle position, the second directional valve 11 switches to the left position, the oil supply and speed of the second main pump 16 remain unchanged, and the oil supply of the first main pump 14 is increased at the same time.

[0053] When the antifreeze temperature sensor 3 detects that the antifreeze temperature is higher than T1, and the hydraulic oil temperature sensor 17 detects that the hydraulic oil temperature is at T2, the second reversing valve 11 and the third reversing valve 12 remain in the right position, the first reversing valve 19 remains in the middle position, the oil supply and speed of the second main pump 16 remain unchanged, and the oil supply of the first main pump 14 is increased at the same time; when the antifreeze temperature is higher than TF, the first electronically controlled stepless speed regulating device 13 is started to increase the speed of the first main pump 14, thereby increasing the forward rotation speed of the antifreeze cooling motor 8.

[0054] The engineering machinery described in this invention includes the aforementioned temperature control system. This system not only has the function of individually regulating the temperature of antifreeze and hydraulic oil, but also can redistribute the oil volume of the two oil circuits through the first reversing valve 19. This prevents the engineering vehicle from malfunctioning due to a failure of one main pump causing the corresponding radiator to overheat rapidly, thus improving system reliability. An electronically controlled continuously variable transmission (CVT) is added between the engine and the main pump that drives the antifreeze radiator fan. When the antifreeze or hydraulic oil temperature rises rapidly, the main pump speed can be increased to exceed the engine speed, and the speed ratio can be infinitely adjusted, thereby increasing the motor speed to drive the fan speed and improving fault response capabilities.

[0055] This invention can adjust the temperature of antifreeze and hydraulic oil by combining methods such as changing the direction of motor rotation, the oil supply of the main pump, the speed of the main pump, and redistributing the oil volume of the two oil circuits through the first reversing valve 19, so that the antifreeze and hydraulic oil work within the optimal temperature range according to the actual working conditions.

Claims

1. A temperature control system comprising a first main pump (14) supplying oil to an antifreeze radiator motor (8), thereby driving an antifreeze radiator fan (6) to rotate, and a second main pump (16) supplying oil to a hydraulic oil radiator motor (9), thereby driving a hydraulic oil radiator fan (7) to rotate, characterized in that: A first reversing valve (19) is provided between the oil circuit formed by the first main pump (14) and the antifreeze cooling motor (8) and the oil circuit formed by the second main pump (16) and the hydraulic oil cooling motor (9). A one-way valve (20) to prevent backflow is provided between the first reversing valve (19) and the first main pump (14) and the second main pump (16). By switching the working position of the valve core of the first reversing valve (19), the first main pump (14) can supply oil to the hydraulic oil cooling motor (9) or the second main pump (16) can supply oil to the antifreeze cooling motor (8). A second reversing valve (11) and a third reversing valve (12) are respectively provided between the first reversing valve (19) and the antifreeze cooling motor (8) and the hydraulic oil cooling motor (9). The first reversing valve (19), the second reversing valve (11) and the third reversing valve (12) are all three-position four-way proportional reversing valves. When it is determined that the first main pump (14) is damaged, the first reversing valve (19) will be switched to the upper position, and the second main pump (16) will supply oil to the antifreeze cooling motor (8) through the R1 oil port to the R3 oil port of the first reversing valve (19). When it is determined that the second main pump (16) is damaged, the first directional valve (19) will be switched to the lower position, and the first main pump (14) will supply oil to the hydraulic oil cooling motor (9) through the R4 oil port to the R2 oil port of the first directional valve (19). When the antifreeze temperature is lower than Tf and the hydraulic oil temperature is higher than T2, switch the second reversing valve (11) to the left position, so that the first main pump (14) drives the antifreeze radiator fan (6) to reverse. The third reversing valve (12) is in the right position, and the second main pump (16) drives the hydraulic oil cooling motor (9) to rotate forward. At the same time, switch the first reversing valve (19) to the upper position, and the second main pump (16) supplies oil to the antifreeze cooling motor (8) through the R1 oil port to the R3 oil port of the first reversing valve (19), thereby increasing the rotation speed of the antifreeze radiator fan (6) in reverse. When the antifreeze temperature is higher than Tf and lower than T1, and the hydraulic oil temperature is higher than T2, the second directional valve (11) switches to the middle position, the third directional valve (12) is in the right position, the second main pump (16) drives the hydraulic oil cooling motor (9) to rotate forward, and at the same time switches the first directional valve (19) to the lower position. The first main pump (14) supplies oil to the hydraulic oil cooling motor (9) through the R4 oil port to the R2 oil port of the first directional valve (19), thereby increasing the rotation speed of the hydraulic oil cooling motor (9) in the forward rotation. When the antifreeze temperature is higher than T1 and the hydraulic oil temperature is lower than Ty, the second directional valve (11) is switched to the right position, causing the first main pump (14) to drive the antifreeze radiator fan (6) to rotate forward. The third directional valve (12) is switched to the left position, causing the second main pump (16) to drive the hydraulic oil cooling motor (9) to rotate in reverse. At the same time, the first directional valve (19) is switched to the lower position, and the first main pump (14) supplies oil to the hydraulic oil cooling motor (9) through the R4 oil port to the R2 oil port of the first directional valve (19), thereby increasing the rotation speed of the hydraulic oil cooling motor (9) in reverse rotation. When the antifreeze temperature is higher than T1 and the hydraulic oil temperature is higher than Ty but lower than T2, the third directional valve (12) is in the middle position, the second directional valve (11) is switched to the right position, the first main pump (14) drives the antifreeze cooling motor (8) to rotate forward, and at the same time switches the first directional valve (19) to the upper position. The second main pump (16) supplies oil to the antifreeze cooling motor (8) through the R1 to R3 oil ports of the first directional valve (19), thereby increasing the rotation speed of the antifreeze cooling motor (8) in the forward rotation.

2. The temperature control system according to claim 1, characterized in that: The antifreeze radiator fan (6) corresponds to the antifreeze radiator (4), and the antifreeze radiator (4) is connected to the power system (1); an antifreeze temperature sensor (3) is provided between the antifreeze radiator (4) and the power system (1); the hydraulic oil radiator fan (7) corresponds to the hydraulic oil radiator (5), and the hydraulic oil radiator (5) is connected to the hydraulic system (2).

3. The temperature control system according to claim 1, characterized in that: The first main pump (14) and the second main pump (16) are driven by the engine (18). A first electronically controlled stepless speed regulation device (13) and a second electronically controlled stepless speed regulation device (15) are respectively provided between the engine (18) and the first main pump (14) and the second main pump (16) to continuously adjust the speed ratio between the engine (18) and the main pump, so that the speed of the first main pump (14) and the second main pump (16) is greater than the speed of the engine (18).

4. The temperature control system according to claim 3, characterized in that: A first pressure sensor (21) is provided between the second reversing valve (11) and the antifreeze cooling motor (8), and a second pressure sensor (22) is provided between the third reversing valve (12) and the hydraulic oil cooling motor (9), respectively, for monitoring the oil pressure of each oil circuit.

5. The temperature control system according to claim 4, characterized in that: The hydraulic oil tank is equipped with a hydraulic oil temperature sensor (17). The antifreeze temperature sensor (3), the hydraulic oil temperature sensor (17), the first electronically controlled stepless speed regulating device (13), the second electronically controlled stepless speed regulating device (15), the first main pump (14), and the second main pump (16) are respectively connected to the controller (10). The oil outlet T of the second reversing valve (11) and the third reversing valve (12), and the oil inlet of the first main pump (14) and the second main pump (16) are connected to the external hydraulic oil tank.

6. The temperature control system according to claim 5, characterized in that: When the first main pump (14) suddenly fails during operation, the antifreeze cooling motor (8) generates negative pressure due to the sudden oil cut-off. The first pressure sensor (21) will detect the negative pressure. When the controller (10) controls the first main pump (14) normally and detects the negative pressure in the antifreeze cooling motor (8), it will determine that the first main pump (14) is damaged. When the second main pump (16) suddenly fails during operation, the hydraulic oil cooling motor (9) generates negative pressure due to the sudden oil cut-off. The second pressure sensor (22) will detect the negative pressure. When the controller (10) controls the second main pump (16) normally and detects the negative pressure in the hydraulic oil cooling motor (9), it will determine that the second main pump (16) is damaged.

7. The temperature control system according to claim 5, characterized in that: Let the optimal operating temperature range of the antifreeze be T1, the optimal operating temperature range of the hydraulic oil be T2, the minimum temperature of the antifreeze be Tf, the maximum temperature be TF, the minimum temperature of the hydraulic oil be Ty, and the maximum temperature be TY. <T1<TF,Ty<T2<TY; When the antifreeze temperature sensor (3) detects that the antifreeze temperature is lower than Tf and the hydraulic oil temperature sensor (17) detects that the hydraulic oil temperature is lower than Ty, the second reversing valve (11) and the third reversing valve (12) are switched to the left position, so that the first main pump (14) supplies oil to the antifreeze cooling motor (8) through the oil port P and oil port B of the second reversing valve (11) in sequence, and the second main pump (16) supplies oil to the hydraulic oil cooling motor (9) through the oil port P and oil port A of the third reversing valve (12) in sequence, thereby driving the antifreeze radiator fan (6) and the hydraulic oil radiator fan (7) to reverse, blowing the hot air from the engine (18) to the radiator, increasing the temperature of the radiator, thereby increasing the temperature of the antifreeze and the hydraulic oil; When the antifreeze temperature sensor (3) detects that the antifreeze temperature is higher than TF, and the hydraulic oil temperature sensor (17) detects that the hydraulic oil temperature is higher than TY, the second directional valve (11) and the third directional valve (12) are in the right position. The first main pump (14) supplies oil to the antifreeze cooling motor (8) through the oil port P and oil port A of the second directional valve (11) in sequence, and the second main pump (16) supplies oil to the hydraulic oil cooling motor (9) through the oil port P and oil port B of the third directional valve (12) in sequence. The antifreeze radiator fan (6) and hydraulic oil radiator fan (7) are driven to rotate forward. The controller (10) makes the first electronically controlled stepless speed regulating device (13) and the second electronically controlled stepless speed regulating device (15) work to increase the speed of the first main pump (14) and the second main pump (16). At the same time, the controller (10) makes the first main pump (14) and the second main pump (16) increase the oil supply, thereby increasing the rotation speed of the antifreeze radiator motor (8) and the hydraulic oil radiator motor (9) in the forward rotation.

8. The temperature control system according to claim 7, characterized in that: When the antifreeze temperature sensor (3) detects that the antifreeze temperature is higher than Tf and lower than T1, and the hydraulic oil temperature sensor (17) detects that the hydraulic oil temperature is higher than Ty and lower than T2, the second reversing valve (11) and the third reversing valve (12) are in the right position. The controller (10) reduces the oil supply of the first main pump (14) and the second main pump (16), thereby reducing the forward rotation speed of the antifreeze cooling motor (8) and the hydraulic oil cooling motor (9); or by adjusting the valve core opening of the second reversing valve (11) and the third reversing valve (12), the amount of oil flowing through the motor is controlled, thereby reducing the forward rotation speed of the antifreeze cooling motor (8) and the hydraulic oil cooling motor (9); or by switching the second reversing valve (11) and the third reversing valve (12) to the middle position, the antifreeze cooling motor (8) and the hydraulic oil cooling motor (9) stop working. When the antifreeze temperature sensor (3) detects that the antifreeze temperature is higher than T1 and lower than TF, and the hydraulic oil temperature sensor (17) detects that the hydraulic oil temperature is higher than T2 and lower than TY, the second reversing valve (11) and the third reversing valve (12) are in the right position. The controller (10) increases the oil supply of the first main pump (14) and the second main pump (16), and increases the rotation speed of the antifreeze cooling motor (8) and the hydraulic oil cooling motor (9) in the forward rotation.

9. The temperature control system according to claim 7, characterized in that: When the antifreeze temperature sensor (3) detects the antifreeze temperature at T1 and the hydraulic oil temperature sensor (17) detects the hydraulic oil temperature at T2, the second directional valve (11) and the third directional valve (12) remain in the right position, the first directional valve (19) remains in the middle position, and the oil discharge and speed of the first main pump (14) and the second main pump (16) remain unchanged. When the antifreeze temperature sensor (3) detects that the antifreeze temperature is at T1, and the hydraulic oil temperature sensor (17) detects that the hydraulic oil temperature is higher than T2 and lower than TY, the second reversing valve (11) and the third reversing valve (12) remain in the right position, the first reversing valve (19) remains in the middle position, the oil supply and speed of the first main pump (14) remain unchanged, and the oil supply of the second main pump (16) is increased; when the hydraulic oil temperature is >TY, the second electronically controlled stepless speed regulating device (15) is started to increase the speed of the second main pump (16), thereby increasing the forward rotation speed of the hydraulic oil cooling motor (9); When the antifreeze temperature sensor (3) detects that the antifreeze temperature is at T1 and the hydraulic oil temperature sensor (17) detects that the hydraulic oil temperature is lower than T2, the second directional valve (11) remains in the right position, the first directional valve (19) is in the middle position, the oil supply and speed of the first main pump (14) remain unchanged, the third directional valve (12) switches to the left position, and at the same time increases the oil supply of the second main pump (16).

10. The temperature control system according to claim 7, characterized in that: When the antifreeze temperature sensor (3) detects that the antifreeze temperature is lower than T1 and the hydraulic oil temperature sensor (17) detects that the hydraulic oil temperature is at T2, the third directional valve (12) remains in the right position, the first directional valve (19) is in the middle position, the second directional valve (11) switches to the left position, the oil supply and speed of the second main pump (16) remain unchanged, and the oil supply of the first main pump (14) is increased at the same time. When the antifreeze temperature sensor (3) detects that the antifreeze temperature is higher than T1, and the hydraulic oil temperature sensor (17) detects that the hydraulic oil temperature is at T2, the second reversing valve (11) and the third reversing valve (12) remain in the right position, the first reversing valve (19) remains in the middle position, the oil supply and speed of the second main pump (16) remain unchanged, and the oil supply of the first main pump (14) is increased at the same time; when the antifreeze temperature is higher than TF, the first electronically controlled stepless speed regulating device (13) is started to increase the speed of the first main pump (14), thereby increasing the forward rotation speed of the antifreeze cooling motor (8).

11. An engineering machinery, characterized in that: The temperature control system includes any one of claims 1-10.

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