Energy-saving and noise-reducing type heat dissipation hydraulic system

Abstract

The utility model discloses an energy-saving noise-reducing heat dissipation hydraulic system, which is characterized in that an engine is in power connection with a hydraulic pump, the hydraulic pump is connected with an electromagnetic valve, and the electromagnetic valve is in power connection with a hydraulic motor and a heat dissipation fan. And the temperature sensor, the control end of the electromagnetic valve and the control end of the electric proportional overflow valve are respectively connected with the controller. An oil outlet of the hydraulic pump is further connected with a control oil cavity C1 of the hydraulic control valve, a working oil port P of the hydraulic control valve, a control oil cavity C2 of the hydraulic control valve and an oil inlet of the electric proportional overflow valve, the hydraulic control valve is connected with a large cylinder of the oil cylinder, and a piston rod of the oil cylinder is connected with a swash plate of the hydraulic pump. Working oil ways are switched through the two-position four-way electromagnetic valve and the electric proportional overflow valve which are used for switching the oil ways, under the condition that the heat dissipation requirement is low, stalling of the hydraulic motor and the fan is achieved, and noise is reduced.

Description

Technical Field

[0001] The utility model relates to an energy-saving and noise-reducing heat dissipation hydraulic system, belonging to the technical field of engineering machinery heat dissipation systems. Background Art

[0002] Construction machinery will generate a lot of heat during operation. Usually, a heat dissipation hydraulic system is used to dissipate heat from the engine compartment, engine cooling water and hydraulic oil of the construction machinery.

[0003] The temperature of construction machinery is low in the initial stage of operation, but the cooling fan operates at high power, resulting in a waste of engine power. This not only wastes the fuel required by the engine, but also increases exhaust emissions. In addition, the cooling fan will generate a lot of noise when working at high power.

[0004] As the country's demand for energy conservation and emission reduction increases, reducing energy loss is becoming increasingly important, while noise control is also becoming increasingly stringent. Currently, the cooling hydraulic system of most construction machinery typically includes a hydraulic motor, a cooling fan, and cooling pipes. Existing hydraulic systems can only start and stop the cooling fan by switching the hydraulic motor's oil circuit on and off, and are unable to adjust the oil pressure entering the hydraulic motor according to changes in engine speed and temperature. Although not turning on the cooling fan during the initial operation of the construction machinery reduces noise, it does not better meet the cooling needs of the construction machinery under various operating conditions.

[0005] Therefore, those skilled in the art urgently need to solve the deficiencies in the hydraulic circuit of the existing cooling system. Utility Model Content

[0006] Purpose: In order to overcome the problems in the prior art that after the engine is started, the heat dissipation hydraulic system starts to have a large flow, and high pressure drives the heat dissipation fan to operate, resulting in energy waste, and the noise generated by the fan when the condenser temperature is low, the utility model provides an energy-saving and noise-reducing heat dissipation hydraulic system.

[0007] Technical solution: In order to solve the above technical problems, the technical solution adopted by this utility model is:

[0008] An energy-saving and noise-reducing heat-dissipating hydraulic system comprises an engine, a solenoid valve, a hydraulic motor, a heat-dissipating fan, and a hydraulic oil tank.

[0009] The engine is connected to the power input end of the hydraulic pump through the transmission shaft. The hydraulic pump suction port draws hydraulic oil from the hydraulic oil tank through the hydraulic pipeline. The hydraulic pump outlet is connected to the working oil port P of the solenoid valve through the hydraulic pipeline. The working oil port T of the solenoid valve is connected to the oil tank through the hydraulic pipeline. The working oil port A of the solenoid valve is connected to the oil inlet of the hydraulic motor through the hydraulic pipeline. The working oil port B of the solenoid valve is connected to the oil return port of the hydraulic motor. The power output end of the hydraulic motor is connected to the cooling fan.

[0010] The system also includes an electric proportional relief valve and a hydraulic control valve. The temperature sensor, the control end of the solenoid valve, and the control end of the electric proportional relief valve are each connected to a controller. The temperature sensor is used to collect the condenser inlet water temperature. The hydraulic pump oil outlet is also connected to the control oil chamber C1 of the hydraulic control valve, the working oil port P of the hydraulic control valve, the control oil chamber C2 of the hydraulic control valve, and the oil inlet of the electric proportional relief valve. The working oil port A of the hydraulic control valve is connected to the main cylinder of the oil cylinder via a hydraulic pipeline. The piston rod of the oil cylinder is connected to the swash plate of the hydraulic pump. The oil outlet of the electric proportional relief valve is connected to the oil tank.

[0011] As a preferred solution, a bypass pressure relief oil circuit is also included, and a bypass pressure relief oil circuit is also provided between the large cylinder of the oil cylinder and the oil tank.

[0012] As a preferred solution, a first damping hole is provided on the hydraulic pipeline near the control oil chamber C2 of the hydraulic control valve.

[0013] As a preferred solution, a second damping hole is provided on the hydraulic pipeline between the working oil port A of the hydraulic control valve and the large cylinder of the oil cylinder.

[0014] As a preferred solution, a second damping hole is provided on the bypass pressure relief oil circuit.

[0015] As a preferred solution, a one-way valve is further connected in parallel between the oil inlet and the oil return port of the hydraulic motor.

[0016] Beneficial Effects: This utility model provides an energy-saving, noise-reducing heat dissipation hydraulic system. By switching the two-position, four-way solenoid valve and the electro-proportional relief valve in the oil circuit, the working oil circuit is switched. When heat dissipation demand is low, the hydraulic motor and fan are stopped, reducing noise generation. By adjusting the opening of the electro-proportional relief valve, the heat dissipation hydraulic system operates at low flow and pressure when heat dissipation demand is low, reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the present utility model.

[0018] Figure 2 This is a structural diagram of the hydraulic control valve, electric proportional relief valve and oil cylinder of the utility model. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] Example 1:

[0021] This embodiment introduces an energy-saving and noise-reducing heat dissipation hydraulic system. Figure 1As shown, it includes: an engine 1, a transmission shaft 2, a solenoid valve 3, a hydraulic motor 4, a cooling fan 5, a hydraulic oil tank 6, a temperature sensor 7, a controller 8, and a hydraulic pump 9.

[0022] The engine 1 is connected to the power input end of the hydraulic pump 9 through the transmission shaft 2. The oil suction port of the hydraulic pump 9 draws hydraulic oil from the hydraulic oil tank 6 through a hydraulic pipeline. The oil outlet of the hydraulic pump 9 is connected to the working oil port P of the solenoid valve 3 through a hydraulic pipeline. The working oil port T of the solenoid valve 3 is connected to the oil tank 6 through a hydraulic pipeline. The working oil port A of the solenoid valve 3 is connected to the oil inlet of the hydraulic motor 4 through a hydraulic pipeline. The working oil port B of the solenoid valve 3 is connected to the oil return port of the hydraulic motor 4. The power output end of the hydraulic motor 4 is connected to the cooling fan 5.

[0023] like Figure 2 As shown, the system further includes an electric proportional relief valve 12 and a hydraulic control valve 13. The temperature sensor 7, the control end of the solenoid valve 3, and the control end of the electric proportional relief valve 12 are respectively connected to the controller 8. The temperature sensor 7 is used to collect the condenser inlet water temperature. The oil outlet of the hydraulic pump 9 is also respectively connected to the control oil chamber C1 of the hydraulic control valve 13, the working oil port P of the hydraulic control valve 13, the control oil chamber C2 of the hydraulic control valve 13, and the oil inlet of the electric proportional relief valve 12. The working oil port A of the hydraulic control valve 13 is connected to the large cylinder of the oil cylinder 11 via a hydraulic pipeline. The piston rod of the oil cylinder 11 is connected to the swash plate 10 of the hydraulic pump 9. The oil outlet of the electric proportional relief valve 12 is connected to the oil tank 6.

[0024] Furthermore, a bypass pressure relief oil circuit 14 is also included, and a bypass pressure relief oil circuit 14 is also provided between the large cylinder of the oil cylinder 11 and the oil tank 6. It is used to increase the oil speed when the oil cylinder 11 returns oil outward, so that the piston rod can retract quickly.

[0025] Furthermore, a first damping hole 15 is provided on the hydraulic pipeline near the control oil chamber C2 of the hydraulic control valve 13 to reduce the hydraulic pressure in the control oil chamber C2 of the hydraulic control valve 13 and the hydraulic pipeline of the electric proportional relief valve 12 .

[0026] Furthermore, a second damping hole 16 is provided on the hydraulic pipeline between the working oil port A of the hydraulic control valve 13 and the large cylinder of the oil cylinder 11 to reduce the hydraulic pressure in the hydraulic pipeline between the working oil port A of the hydraulic control valve 13 and the large cylinder of the oil cylinder 11 .

[0027] Furthermore, a second damping hole 17 is provided on the bypass pressure relief oil circuit 14 for reducing the hydraulic pressure in the bypass pressure relief oil circuit 14 .

[0028] Furthermore, a one-way valve 18 is connected in parallel between the oil inlet and the oil return port of the hydraulic motor 4 to prevent reverse flow when the hydraulic motor 4 is not in operation.

[0029] Example 2:

[0030] This embodiment introduces the working principle of an energy-saving and noise-reducing heat dissipation hydraulic system. When the engine 1 starts to work, the transmission shaft 2 drives the hydraulic pump 9 to start working. The hydraulic pump 9 sends hydraulic oil to the working oil port P of the solenoid valve 3. At this time, because the engine has just started to work, the controller detects that the condenser inlet water temperature is not high according to the temperature sensor 7. Therefore, the controller sends an electric signal to the control end of the solenoid valve 3 to make the solenoid valve 3 work in the first working position. When in the first working position, the working oil port P is cut off, and the working oil ports A, B and T are connected. The above functions have been achieved in the existing technology. In order to avoid pressure buildup in the hydraulic pump 9, the present utility model sends an electric signal to the control end of the electric proportional relief valve 12. The electric proportional relief valve 12 opens to its maximum opening, and the hydraulic oil of the hydraulic pump 9 flows directly into the oil tank.

[0031] As the engine operating time increases, when the temperature measured by the temperature sensor 7 is higher than the first set value of the controller 8 but lower than the other set values, the cooling fan 5 needs to be used for heat dissipation, but it does not need to be output at maximum power. A part of the hydraulic oil output by the hydraulic pump 9 is sent to the control oil chamber C1, the control oil chamber C2 and the working oil port P of the hydraulic control valve 13 respectively. By adjusting the opening of the electric proportional relief valve 12, the hydraulic pressure on the control oil chamber C1 side is greater than the pressure of the control oil chamber C2 and the spring, so that the hydraulic control valve 13 works in the first working position. When in the first working position, the working oil port P is connected to the working oil port A, and a part of the hydraulic oil enters the large chamber of the oil cylinder through the hydraulic control valve 13, pushing the piston rod to control the swash plate 10 of the hydraulic pump 9. The piston rod extends, the inclination angle of the swash plate 10 becomes larger, and the displacement of the hydraulic pump 9 decreases.

[0032] When the temperature measured by the temperature sensor 7 just starts to exceed the first set value, the opening of the electric proportional relief valve 12 can be controlled so that the hydraulic control valve 13 is in the first working position, the piston rod is extended to the maximum position, the inclination angle of the swash plate 10 is maximum, the displacement of the hydraulic pump 9 is minimum, the hydraulic flow flowing into the hydraulic motor 4 is minimized, and the speed of the cooling fan 5 is minimized, thereby achieving the effect of reducing energy consumption and noise.

[0033] As the engine's operating time increases and other mechanical operating conditions are combined, the condenser inlet water temperature continues to rise, exceeding the upper setpoint. This requires cooling fan 5 to operate at its maximum speed. The opening of electro-proportional relief valve 12 is adjusted so that the hydraulic pressure in control chamber C1 is less than the pressure in control chamber C2 and the spring. Hydraulic control valve 13 operates in its second operating position. In this position, working port P is blocked, and working port T is connected to working port A. The oil in the cylinder's large chamber flows back to the tank through hydraulic control valve 13, retracting the piston rod, reducing the inclination of swash plate 10, and increasing the displacement of hydraulic pump 9. This maximizes the hydraulic flow to hydraulic motor 4 and the speed of cooling fan 5. Oil flowing out of the cylinder's large chamber can also flow back to the tank via the bypass pressure relief line, accelerating piston rod retraction.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An energy-saving and noise-reducing heat-dissipating hydraulic system, characterized by: include: Engine, solenoid valve, hydraulic motor, cooling fan, hydraulic oil tank; The engine is connected to the power input end of the hydraulic pump through the transmission shaft. The hydraulic pump suction port draws hydraulic oil from the hydraulic oil tank through the hydraulic pipeline. The hydraulic pump outlet is connected to the working oil port P of the solenoid valve through the hydraulic pipeline. The working oil port T of the solenoid valve is connected to the oil tank through the hydraulic pipeline. The working oil port A of the solenoid valve is connected to the oil inlet of the hydraulic motor through the hydraulic pipeline. The working oil port B of the solenoid valve is connected to the oil return port of the hydraulic motor. The power output end of the hydraulic motor is connected to the cooling fan. It also includes: an electric proportional relief valve, a hydraulic control valve, a temperature sensor, a control end of the solenoid valve, and a control end of the electric proportional relief valve, which are respectively connected to the controller, and the temperature sensor is used to collect the water inlet temperature of the condenser; the oil outlet of the hydraulic pump is also respectively connected to the control oil chamber C1 of the hydraulic control valve, the working oil port P of the hydraulic control valve, the control oil chamber C2 of the hydraulic control valve and the oil inlet of the electric proportional relief valve, the working oil port A of the hydraulic control valve is connected to the large cylinder of the oil cylinder through a hydraulic pipeline, the piston rod of the oil cylinder is connected to the swash plate of the hydraulic pump, and the oil outlet of the electric proportional relief valve is connected to the oil tank.

2. The energy-saving and noise-reducing heat-dissipating hydraulic system according to claim 1, characterized in that: It also includes a bypass pressure relief oil circuit, and a bypass pressure relief oil circuit is also provided between the large cylinder of the oil cylinder and the oil tank.

3. The energy-saving and noise-reducing heat-dissipating hydraulic system according to claim 1, characterized in that: A first damping hole is provided on the hydraulic pipeline near the control oil chamber C2 of the hydraulic control valve.

4. The energy-saving and noise-reducing heat-dissipating hydraulic system according to claim 1, characterized in that: A second damping hole is provided on the hydraulic pipeline between the working oil port A of the hydraulic control valve and the large cylinder of the oil cylinder.

5. The energy-saving and noise-reducing heat-dissipating hydraulic system according to claim 2, characterized in that: A second damping hole is provided on the bypass pressure relief oil circuit.

6. The energy-saving and noise-reducing heat-dissipating hydraulic system according to claim 1, characterized in that: A one-way valve is connected in parallel between the oil inlet and the oil return port of the hydraulic motor.

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