Fan drive system and working machine

Abstract

The utility model relates to fan drive technical field discloses a fan drive system and engineering machinery, include: hydraulic motor has output shaft, hydraulic control valve group is equipped with liquid inlet, first liquid outlet and first control port, first liquid outlet communicates with hydraulic motor, and hydraulic control valve group switches at least between first state and second state according to whether the hydraulic pressure of first control port, in first state, liquid inlet and first liquid outlet communicate, and output shaft rotates, in second state, liquid inlet and first liquid outlet are disconnected, and output shaft stops rotating, heat dissipation pump, with first control port through first liquid channel intercommunication, and with liquid inlet through second liquid channel intercommunication, pilot pump, with first control port through third liquid channel intercommunication, first liquid channel intercommunication time, third liquid channel cut -off, third liquid channel intercommunication time, first liquid channel cut -off. Fan drive system utilizes hydraulic control valve group to control the rotation and stop of hydraulic motor, can realize the purpose of fast warming -up, saving power consumption when temperature is lower.

Description

Technical Field

[0001] This utility model relates to the field of fan drive technology, specifically to a fan drive system and engineering machinery. Background Technology

[0002] In construction machinery, the hydraulic oil in the hydraulic system is cooled by air through a hydraulic radiator. The cooling fan is mechanically connected to a hydraulic motor, which drives the fan for cooling. An electromagnetic relief valve is located between the cooling pump and the hydraulic oil tank. Adjusting the pressure of the electromagnetic relief valve according to the hydraulic oil temperature changes the output torque of the hydraulic motor, ultimately affecting the speed of the cooling fan. Due to the low-speed rotation characteristics of the cooling fan and the airflow pattern before and after the radiator, the fan speed fluctuates under low torque, resulting in fluctuating wind noise. To control noise fluctuations, a minimum stable speed is set. Because of this minimum speed, the cooling fan continuously cools the radiator regardless of the temperature, leading to long warm-up times and high power consumption. Utility Model Content

[0003] This invention provides a fan drive system and engineering machinery to solve the problems of long warm-up time and high power consumption in low-temperature environments in the prior art.

[0004] In a first aspect, this utility model provides a fan drive system, comprising: a hydraulic motor having an output shaft for connecting to a fan; a hydraulic control valve assembly having an inlet, a first outlet, and a first control port, the first outlet being connected to the hydraulic motor, the hydraulic control valve assembly switching between at least a first state and a second state depending on whether there is hydraulic pressure at the first control port; in the first state, the inlet and the first outlet are connected, and the output shaft rotates; in the second state, the inlet and the first outlet are disconnected, and the output shaft stops rotating; a cooling pump connected to the first control port via a first liquid channel and connected to the inlet via a second liquid channel; and a pilot pump connected to the first control port via a third liquid channel; when the first liquid channel is connected, the third liquid channel is closed, and when the third liquid channel is connected, the first liquid channel is closed.

[0005] Beneficial effects: By installing a hydraulic valve assembly between the cooling pump, pilot pump, and hydraulic motor, the hydraulic valve assembly acts as a control element for starting and stopping the hydraulic motor. It can realize the rotation and stopping of the fan. When the hydraulic oil temperature is low, there is no need for the cooling fan to cool the radiator. By cutting off the hydraulic oil output from the cooling pump or pilot pump through the hydraulic control valve assembly, no hydraulic oil enters the hydraulic motor, thus stopping the fan. This can achieve the purpose of quickly warming up the engine and saving power consumption, especially in extremely cold regions where the energy-saving effect is more obvious.

[0006] In one optional embodiment, the fan drive system further includes: a first check valve disposed in the first liquid passage, the first check valve controlling liquid to flow unidirectionally from the cooling pump to the hydraulic control valve assembly along the first liquid passage; and a second check valve disposed in the third liquid passage, the second check valve controlling liquid to flow unidirectionally from the pilot pump to the hydraulic control valve assembly along the third liquid passage, wherein the liquid outlet of the first liquid passage and the liquid outlet of the third liquid passage are connected.

[0007] Beneficial effects: The mechanical structure controls the connection of the higher-pressure one of the first and third liquid channels while disconnecting the lower-pressure one, resulting in stable control. It does not require electrical signals or pressure detection, and is not only simple in structure and small in size, but also reduces energy consumption and lowers cost.

[0008] In one alternative embodiment, the fan drive system further includes a pressure reducing valve disposed in the first liquid passage, the pressure reducing valve being located between the heat pump and the first check valve.

[0009] Beneficial effects: The pressure reducing valve can reduce the liquid pressure of the cooling pump to the pressure required for the first liquid channel, reducing the probability of damage to parts and hydraulic control valve assembly in the first liquid channel, extending the service life of the fan drive system, and thus reducing the maintenance cost of the fan drive system.

[0010] In one optional embodiment, the hydraulic control valve assembly further includes a second outlet and a second control port. The first outlet is connected to one oil port of the hydraulic motor, and the second outlet is connected to another oil port of the hydraulic motor. The first liquid passage and the third liquid passage are both connected to the second control port. The hydraulic control valve assembly also has a return port, which is adapted to be connected to a liquid storage device. The hydraulic control valve assembly also has a third state. In the first state, the hydraulic control valve assembly is connected to the second outlet, and the output shaft rotates in a first direction. In the third state, the inlet is connected to the second outlet, the return port is connected to the first outlet, and the output shaft rotates in a second direction, where the first direction and the second direction are opposite.

[0011] Beneficial effects: The output shaft can rotate forward, reverse, and stop. When the output shaft rotates in reverse, the fan also rotates in reverse to clean the heatsink.

[0012] In one optional implementation, the hydraulic control valve assembly is in the second state, and the first outlet, the second outlet, and the return port are connected.

[0013] Beneficial effects: It can force the hydraulic oil from the return side to the inlet side, prevent cavitation on the inlet side, and improve the service life of the hydraulic motor. In addition, after the return side supplies oil to the inlet side, the excess hydraulic oil flows from the return port into the reservoir, avoiding hydraulic oil accumulation.

[0014] In one optional embodiment, the first liquid outlet and the second liquid outlet are disconnected from each other, while the liquid inlet and the liquid return outlet are connected.

[0015] Beneficial effect: In the second state, the oil flowing in through the inlet can flow out directly through the return outlet.

[0016] In one optional embodiment, the fan drive system further includes a third one-way valve connected between the liquid inlet and the liquid return port, the third one-way valve controlling the liquid to flow unidirectionally from the liquid return port to the liquid inlet.

[0017] Beneficial effect: It can prevent hydraulic oil from flowing from the inlet to the outlet, thus ensuring the normal operation of the hydraulic motor.

[0018] In one optional embodiment, the hydraulic control valve assembly includes: a first hydraulic control valve, wherein the inlet, the first outlet, the second outlet, the first control port, and the second control port are all disposed in the first hydraulic control valve; a first solenoid valve, connected to the first liquid passage, the third liquid passage, and the first control port, for controlling the connection and disconnection between one of the first liquid passage and the third liquid passage and the first control port; and a second solenoid valve, connected to the first liquid passage, the third liquid passage, and the second control port, for controlling the connection and disconnection between one of the first liquid passage and the third liquid passage and the second control port.

[0019] Beneficial effects: By controlling the on / off state of the first solenoid valve and the second solenoid valve, the hydraulic pressure at the first control port and the hydraulic pressure at the second control port can be adjusted, thereby controlling the hydraulic control valve assembly to switch between at least the first state and the second state.

[0020] In one optional embodiment, the hydraulic control valve assembly includes: a second hydraulic control valve, wherein a first outlet, a second outlet, and a first control port are disposed on the second hydraulic control valve, and the second hydraulic control valve has a first flow port; and a third hydraulic control valve, wherein an inlet is disposed on the third hydraulic control valve, the second control port is disposed on the third hydraulic control valve, the third hydraulic control valve has a second flow port, and the first flow port and the second flow port are connected. The hydraulic control valve assembly is in a first state, wherein the first flow port is connected to the first outlet, and the second flow port is connected to the inlet. The valve assembly is in the second state, with the second flow port disconnected from the inlet port; the hydraulic control valve assembly is in the third state, with the first flow port connected to the second outlet port and the second flow port connected to the inlet port; a third solenoid valve is connected to the first liquid channel, the third liquid channel, and the first control port, and is used to control the connection and disconnection between one of the first liquid channel and the third liquid channel and the first control port; a fourth solenoid valve is connected to the first liquid channel, the third liquid channel, and the second control port, and is used to control the connection and disconnection between one of the first liquid channel and the third liquid channel and the second control port.

[0021] Beneficial effects: The second hydraulic control valve can be a two-position four-way valve, serving as a control element to control the rotation of the hydraulic motor in the first or second direction. The third hydraulic control valve can be a two-position two-way valve or a two-position three-way valve. When the third hydraulic control valve is a two-position three-way valve, its inlet is connected to the cooling pump, one outlet is connected to the inlet of the second hydraulic control valve, and the other outlet is connected to the reservoir. When the hydraulic motor stops, the oil output from the cooling pump flows directly through the third hydraulic control valve to the reservoir, achieving energy-saving effects. The third hydraulic control valve is used to control the on / off connection between the cooling pump and the second hydraulic control valve, enabling the hydraulic motor to stop.

[0022] In one optional embodiment, the fan drive system further includes: an oil temperature sensor for collecting the internal hydraulic oil temperature t0 of the construction machinery; and a controller communicatively connected to the oil temperature sensor, the cooling pump, and the hydraulic control valve assembly. When t0 ≤ a first preset target temperature t1, the controller controls the hydraulic control valve assembly to switch to the second state; when the first preset target temperature t1 < t0 ≤ a second preset target temperature t2, the controller controls the hydraulic control valve assembly to switch to the first state and controls the cooling pump to output hydraulic oil at minimum pressure so that the output shaft rotates at minimum speed; when the second preset target temperature t2 < t0 < a third preset target temperature t3, the controller controls the hydraulic control valve assembly to switch to the first state and controls the output pressure of the cooling pump to be proportionally related to the rotational speed of the output shaft and t0; when t0 ≥ the third preset target temperature t3, the controller controls the hydraulic control valve assembly to switch to the first state and controls the cooling pump to output hydraulic oil at maximum pressure so that the output shaft rotates at maximum speed.

[0023] Beneficial effects: It can adjust the fan speed in a timely manner according to the oil temperature, which can reduce energy consumption while ensuring heat dissipation.

[0024] In one optional embodiment, the fan drive system further includes: a backflush switch, which is communicatively connected to the controller. When the backflush switch is open, or when the backflush switch is closed and the automatic backflush condition is met, if the hydraulic control valve group is in the second state, the controller controls the hydraulic control valve group to switch to the third state. If the hydraulic control valve group is in the first state and t0 < third preset target temperature t3, the controller controls the hydraulic control valve group to first switch to the second state until the output shaft stops rotating, and then switch to the third state. If the hydraulic control valve group is in the first state and t0 ≥ third preset target temperature t3, t0 is continuously detected until t0 < third preset target temperature t3, and the controller controls the hydraulic control valve group to first switch to the second state until the output shaft stops rotating, and then switch to the third state.

[0025] Beneficial effects: It can avoid switching directly from forward to reverse rotation, reducing the probability of damage to the output shaft due to stress, and can perform backflushing only when the oil temperature is within the preset range, thus ensuring the reliability of the construction machinery.

[0026] Secondly, this utility model also provides an engineering machine, including the above-mentioned fan drive system.

[0027] Beneficial effects: Construction machinery using the above-mentioned fan drive system can have a large flow cooling system, good heat dissipation effect, and high operational stability. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of the engineering machinery according to an embodiment of the present utility model.

[0030] Figure 2 This is one of the partial structural schematic diagrams of the fan drive system according to an embodiment of the present utility model.

[0031] Figure 3 This is a second partial structural schematic diagram of the fan drive system according to an embodiment of the present utility model.

[0032] Figure 4 This is the third partial structural schematic diagram of the fan drive system according to an embodiment of the present utility model.

[0033] Figure 5 This is the fourth partial structural schematic diagram of the fan drive system according to an embodiment of the present utility model.

[0034] Explanation of reference numerals in the attached figures: 1. Fan drive system; 2. Construction machinery; 100. Hydraulic motor; 110. Fan; 200, Hydraulic control valve assembly; 201, Inlet; 202, Return port; 203, First outlet; 204, Second outlet; 207, First control port; 208, Second control port; 210, First hydraulic control valve; 220, First solenoid valve; 230, Second solenoid valve; 240, Third solenoid valve; 250, Fourth solenoid valve; 260, Second hydraulic control valve; 261, First flow port; 270, Third hydraulic control valve; 271, Second flow port; 300. Third check valve; 500, Cooling pump; 501, Proportional relief valve; 510, First liquid passage; 511, First check valve; 512, Pressure reducing valve; 520, Second liquid passage; 600. Pilot pump; 610. Third fluid passage; 611. Second check valve; 700, Radiator; 800, Liquid storage device; 810, Oil temperature sensor. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0036] The embodiments of this utility model will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be understood that the preferred embodiments are only for illustrating this utility model and not for limiting the scope of protection of this utility model.

[0037] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the modules related to the present invention and are not drawn according to the actual number, shape and size of the modules in the actual implementation. In the actual implementation, the form, quantity and proportion of each module can be arbitrarily changed, and the layout of the modules may also be more complex.

[0038] The following is combined Figures 1 to 5 The following describes embodiments of the present invention.

[0039] According to an embodiment of the present invention, a fan drive system 1 is provided, comprising a hydraulic motor 100, a hydraulic control valve group 200, a cooling pump 500, and a pilot pump 600.

[0040] The hydraulic motor 100 has an output shaft, and the hydraulic control valve assembly 200 is provided with an inlet 201, a first outlet 203 and a first control port 207. The first outlet 203 is connected to the hydraulic motor 100. The hydraulic control valve assembly 200 switches between at least a first state and a second state depending on whether there is hydraulic pressure at the first control port 207. In the first state, the inlet 201 and the first outlet 203 are connected and the output shaft rotates. In the second state, the inlet 201 and the first outlet 203 are disconnected and the output shaft stops rotating.

[0041] The cooling pump 500 is connected to the first control port 207 via the first liquid channel 510, and the cooling pump 500 is connected to the liquid inlet 201 via the second liquid channel 520. The pilot pump 600 is connected to the first control port 207 via the third liquid channel 610. Specifically, when the first liquid channel 510 is open, the third liquid channel 610 is closed; when the third liquid channel 610 is open, the first liquid channel 510 is closed.

[0042] For example, the output shaft of the hydraulic motor 100 is mechanically connected to the fan 110. When the output shaft rotates, the fan 110 rotates synchronously, and when the output shaft stops, the fan 110 stops synchronously. In the first state, the fan 110 blows air onto the radiator 700 to reduce the temperature of the radiator 700, so that the radiator 700 can effectively dissipate heat from the hydraulic oil inside the construction machinery 2.

[0043] In this embodiment of the invention, a hydraulic valve group is provided between the cooling pump 500, the pilot pump 600 and the hydraulic motor 100. The hydraulic valve group serves as the control element for starting and stopping the hydraulic motor 100, enabling the fan 110 to rotate and stop. When the hydraulic oil temperature is low, there is no need for the cooling fan 110 to cool the radiator 700. The hydraulic oil output from the cooling pump 500 or the pilot pump 600 is cut off by the hydraulic control valve group 200, so that no hydraulic oil enters the hydraulic motor 100, thus stopping the fan 110. This achieves the purpose of quickly warming up the engine and saving power consumption, especially in extremely cold regions where the energy-saving effect is more obvious.

[0044] The hydraulic motor 100, as the actuator that drives the fan 110 to rotate, can be a bidirectional piston motor or a variable phase piston motor. Both bidirectional and variable phase piston motors can have forward and reverse rotation functions. A variable phase piston motor refers to a piston motor whose swashplate can change from a positive swing angle to a negative swing angle. The forward and reverse rotation of the output shaft is achieved by changing the phase of the swashplate swing angle.

[0045] The construction machinery 2 also includes a controller, an oil temperature sensor 810, and a speed sensor. The controller can be a vehicle control unit (VCU). The oil temperature sensor 810 can be used to collect the hydraulic oil temperature inside the construction machinery 2 in real time. The speed sensor collects the speed data of the hydraulic motor 100 in real time. The speed sensor and the hydraulic motor 100 can be integrated into one unit. The speed sensor collects the speed of the hydraulic motor 100 in real time. The controller is communicatively connected to the oil temperature sensor 810, the cooling pump 500, and the hydraulic control valve group 200. The controller receives the oil temperature signal fed back by the oil temperature sensor 810 and outputs an electrical signal to control the cooling pump 500 and the hydraulic control valve group 200 to realize the speed regulation of the output shaft of the hydraulic motor 100.

[0046] The fan drive system 1 also includes a proportional relief valve 501. The proportional relief valve 501 can be an inverse proportional control electro-proportional relief valve 501. The cooling pump 500 and the proportional relief valve 501 can be integrated into one unit, forming a variable displacement piston pump. The controller is connected to the proportional relief valve 501 and controls its opening based on the hydraulic oil temperature to adjust the flow rate from the cooling pump 500 outlet to the hydraulic motor 100, thereby regulating the output shaft speed of the hydraulic motor 100. Simultaneously, based on the pressure of the proportional relief valve 501, the cooling pump 500 automatically adjusts its displacement to output the required flow rate of the hydraulic motor 100, achieving zero overflow loss, reducing power loss in the cooling system, and achieving energy saving. When the hydraulic control valve group 200 switches to the second state, the controller can control the proportional relief valve 501 to drain oil and minimize the output flow rate of the cooling pump 500, achieving 100% or near-100% stop of the output shaft and reducing the energy consumption of the cooling pump 500.

[0047] When the hydraulic oil needs cooling, the hydraulic control valve assembly 200 switches to the first state. The controller dynamically adjusts the output of the cooling pump 500 according to the hydraulic oil temperature and the fan speed 110, and adjusts the fan speed 110 in real time to ensure that the fan speed 110 meets the cooling requirements of the hydraulic oil. When the hydraulic oil does not need cooling, the hydraulic control valve assembly 200 switches to the second state, and the fan 110 stops. Under conditions such as low ambient temperature and short working time, this is beneficial for rapid warm-up and energy saving, especially in extremely cold regions where the energy-saving effect is more obvious.

[0048] In this embodiment of the invention, the on / off state between the hydraulic motor 100 and the cooling pump 500 is controlled by the hydraulic control valve group 200, which is not limited by electromagnetic force. It can not only meet the cooling system requirements of small flow rate, but also meet the usage requirements of cooling system requirements of large flow rate. That is, the cooling system with the output flow rate of the cooling pump 500 is greater than or equal to 60L / min can also use the fan drive system 1 of this invention, which has a wider range of applications.

[0049] In addition, by connecting the cooling pump 500 and the control port 206 through the first liquid channel 510, and connecting the pilot pump 600 and the control port 206 through the third liquid channel 610, the hydraulic control valve group 200 can be controlled not only by the liquid pressure of the cooling pump 500, but also by the liquid pressure of the pilot pump 600 of the whole machine servo system. The dual-circuit oil supply achieves redundancy design, which can ensure that the hydraulic control valve group 200 can work normally whether the servo system pressure or the cooling system pressure is insufficient. This allows the fan drive system 1 to work stably and for a long time, resulting in high system stability and good economy.

[0050] In some implementations, such as Figures 2-5As shown, the fan drive system 1 also includes a first check valve 511 and a second check valve 611. The first check valve 511 is located in the first liquid passage 510, and controls the liquid to flow unidirectionally from the cooling pump 500 to the hydraulic control valve assembly 200 along the first liquid passage 510. The second check valve 611 is located in the third liquid passage 610, and controls the liquid to flow unidirectionally from the pilot pump 600 to the hydraulic control valve assembly 200 along the third liquid passage 610. The outlet ends of the first liquid passage 510 and the third liquid passage 610 are connected. The outlet end of the first liquid passage 510 is the end of the first liquid passage 510 that connects to the hydraulic control valve assembly 200, and the outlet end of the third liquid passage 610 is the end of the third liquid passage 610 that connects to the hydraulic control valve assembly 200.

[0051] Specifically, when the pressure upstream of the first check valve 511 in the first liquid channel 510 is greater than that upstream of the second check valve 611 in the third liquid channel 610, the first check valve 511 opens and the second check valve 611 closes, the first liquid channel 510 is connected, the third liquid channel 610 is closed, and the cooling pump 500 supplies liquid to the control port 206; when the pressure upstream of the second check valve 611 in the third liquid channel 610 is greater than that upstream of the first check valve 511 in the first liquid channel 510, the first check valve 511 closes and the second check valve 611 opens, the third liquid channel 610 is connected, the first liquid channel 510 is closed, and the pilot pump 600 supplies liquid to the control port 206.

[0052] In this way, by using a mechanical structure to control the connection of the one-way valve upstream of the first liquid channel 510 and the second liquid channel 520 with higher pressure and disconnection of the one with lower pressure, the automatic selection of connection and disconnection of the first liquid channel 510 and the second liquid channel 520 can be achieved. The control is stable, and no electrical signal or pressure detection is required. It is not only simple in structure and small in size, but also reduces energy consumption and lowers cost.

[0053] It should be noted that in some embodiments, the fan drive system 1 may include a pressure sensor and a control valve. The pressure sensor is located in the first liquid channel 510 and the second liquid channel 520, and the control valve is located in both the first liquid channel 510 and the second liquid channel 520. Both the pressure sensor and the control valve are connected to a controller. The controller can switch the on / off state of the control valve based on the pressure data fed back by the pressure sensor, so as to achieve connection of the one with higher pressure in the first liquid channel 510 and the second liquid channel 520. Of course, the fan drive system 1 may also be without a pressure sensor, with the control valve located in the first liquid channel 510 and the second liquid channel 520. The controller can switch the on / off state of the control valve based on other parameters (such as the operating status of the heat pump 500 and the pilot pump 600). The control valve may be a solenoid valve.

[0054] Furthermore, such as Figures 2-5As shown, the fan drive system 1 also includes a pressure reducing valve 512, which is located in the first liquid passage 510 between the heat pump 500 and the first check valve 511. The pressure reducing valve 512 can reduce the liquid storage pressure of the heat pump 500 to the pressure required to adapt to the first liquid passage 510, thereby reducing the probability of damage to the parts on the first liquid passage 510 and the hydraulic control valve assembly 200, extending the service life of the fan drive system 1, and thus reducing the maintenance cost of the fan drive system 1.

[0055] In some embodiments, such as Figures 2-5 As shown, the hydraulic control valve assembly 200 also includes a second outlet 204 and a second control port 208. The first outlet 203 is connected to one oil port of the hydraulic motor 100, and the second outlet 204 is connected to the other oil port of the hydraulic motor 100. The first liquid passage 510 and the third liquid passage 610 are both connected to the second control port 208. The hydraulic control valve assembly 200 is also provided with a return port 202, which is adapted to be connected to the liquid storage device 800.

[0056] The hydraulic control valve assembly 200 also has a third state. In the first state, the return port 202 is connected to the second outlet port 204 and the output shaft rotates in the first direction. In the third state, the inlet port 201 is connected to the second outlet port 204, the return port 202 is connected to the first outlet port 203 and the output shaft rotates in the second direction. The first direction and the second direction are opposite.

[0057] When the output shaft rotates in the first direction, the fan 110 rotates synchronously in the first direction, blowing air towards the radiator 700. When the output shaft rotates in the second direction, the fan 110 rotates synchronously in the second direction, blowing air in the opposite direction to the radiator 700 and drawing air from the radiator 700 to clean it. The controller can control the fan 110 to switch between rotating in the first direction, rotating in the second direction, and stopping states based on the hydraulic oil temperature and the overall vehicle operating status.

[0058] It should be noted that rotating the output shaft in the first direction means the output shaft rotates forward, and rotating the output shaft in the second direction means the output shaft rotates in reverse.

[0059] Furthermore, such as Figure 2As shown, the hydraulic control valve assembly 200 is in the second state, with the first outlet 203, the second outlet 204, and the return port 202 connected. When the hydraulic control valve assembly 200 switches to the second state, the cooling pump 500 stops supplying fluid to the inlet 201, reducing the hydraulic oil on the inlet side of the hydraulic motor 100. However, the fan 110 and the output shaft of the hydraulic motor 100 continue to rotate due to inertia, creating a vacuum on the inlet side of the hydraulic motor 100. By connecting the first outlet 203 and the second outlet 204, the hydraulic oil on the return side can be forcibly introduced into the inlet side, preventing cavitation on the inlet side and improving the service life of the hydraulic motor 100. In addition, after the return side supplies oil to the inlet side, excess hydraulic oil flows into the reservoir 800 from the return port 202, preventing hydraulic oil accumulation.

[0060] Of course, when the hydraulic control valve assembly 200 is in the second state, the first outlet 203 and the second outlet 204 are disconnected, while the inlet 201 and the return port 202 are connected. In this way, the fan drive system 1 does not need to replenish oil to the inlet side through the return side, but can additionally set up other oil passages to replenish oil to the inlet side. The hydraulic oil flowing out from the return side can directly flow into the radiator 700 through the return port 202, improving the heat dissipation effect.

[0061] Specifically, the fan drive system 1 also includes a third check valve 300, which is connected between the inlet port 201 and the return port 202. The third check valve 300 controls the liquid to flow unidirectionally from the return port 202 to the inlet port 201. In this way, hydraulic oil can be prevented from flowing from the inlet port 201 to the return port 202, so as to ensure the normal operation of the hydraulic motor 100.

[0062] In some embodiments, the hydraulic control valve assembly 200 has a P port, a Pi port, an A port, a B port, a T port, a Dr port, a first liquid passage 510, a second liquid passage 520, and a third liquid passage 610. In this case, the first liquid passage 510, the second liquid passage 520, and the third liquid passage 610 are integrated on the hydraulic control valve assembly 200. The radiator pump 500 has a Pp port, which is connected to the P port via a hydraulic line. The oil outlet of the pilot pump 600 is connected to the Pi port via a hydraulic line. The T port is connected to the oil inlet of the radiator 700 via a hydraulic line. The A port is connected to one oil port and the first liquid outlet 203 of the hydraulic motor 100. The B port is connected to the other oil port and the second liquid outlet 204 of the hydraulic motor 100. The Dr port is connected to the liquid storage device 800 via a hydraulic line. The first liquid passage 510 and the second liquid passage 520 are connected to the P port, and the third liquid passage 610 is connected to the Pi port.

[0063] In some embodiments, such as Figure 2 and Figure 3As shown, the hydraulic control valve assembly 200 includes a first hydraulic control valve 210, a first solenoid valve 220, and a second solenoid valve 230. An inlet 201, a first outlet 203, a second outlet 204, a first control port 207, and a second control port 208 are all located on the first hydraulic control valve 210. The first solenoid valve 220 is connected to the first liquid passage 510, the third liquid passage 610, and the first control port 207, and is used to control the opening and closing of one of the first liquid passages 510 and 610 with the first control port 207. The second solenoid valve 230 is connected to the first liquid passage 510, the third liquid passage 610, and the second control port 208, and is used to control the opening and closing of one of the first liquid passages 510 and 610 with the second control port 208.

[0064] The first hydraulic control valve 210 can be a three-position four-way valve, which can be a three-position four-way valve with Y-type function or a three-position four-way valve with M-type function. The first solenoid valve 220 and the second solenoid valve 230 serve as control valves for the first hydraulic control valve 210. Both the first solenoid valve 220 and the second solenoid valve 230 are two-position three-way solenoid valves.

[0065] By controlling the on / off state of the first solenoid valve 220 and the second solenoid valve 230, the presence of hydraulic pressure at the first control port 207 and the second control port 208 can be adjusted, thereby controlling the hydraulic valve assembly 200 to switch between at least the first, second, and third states. The structure is simple. Furthermore, by incorporating a pressure reducing valve 512, the hydraulic pressure output from the cooling pump 500 is reduced to a level suitable for cooperating with the first solenoid valve 220 and the second solenoid valve 230, preventing damage to these valves.

[0066] Furthermore, the Dr port is connected to the return port of the first solenoid valve 220 and the return port of the second solenoid valve 230. The inlet port of the first solenoid valve 220 is connected to the first liquid passage 510 and the third liquid passage 610. The outlet port of the first solenoid valve 220 is connected to the first control port 207. The inlet ports of the second solenoid valve 230 are connected to the first liquid passage 510 and the third liquid passage 610. The outlet port of the second solenoid valve 230 is connected to the second control port 208. When the first hydraulic control valve 210 is a three-position four-way valve with Y-type function, when the valve core of the first hydraulic control valve 210 is in the middle position, the first outlet port 203, the second outlet port 204 and the return port 202 are connected to each other, and the inlet port 201 is cut off.

[0067] In other embodiments, such as Figure 4 and Figure 5 As shown, the hydraulic control valve assembly 200 includes a second hydraulic control valve 260, a third hydraulic control valve 270, a third solenoid valve 240, and a fourth solenoid valve 250.

[0068] The first outlet 203, the second outlet 204, and the first control port 207 are located in the second hydraulic control valve 260. The inlet 201 is located in the third hydraulic control valve 270. The second control port 208 is located in the third hydraulic control valve 270. The third hydraulic control valve 270 is provided with a second flow port 271. The first flow port 261 and the second flow port 271 are connected. The hydraulic control valve assembly 200 is in the first state, with the first flow port 261 connected to the first outlet 203 and the second flow port 271 connected to the inlet 201. The hydraulic control valve assembly 200 is in the second state, with the second flow port 271 disconnected from the inlet 201. The hydraulic control valve assembly 200 is in the third state, with the first flow port 261 connected to the second outlet 204 and the second flow port 271 connected to the inlet 201.

[0069] The third solenoid valve 240 is connected to the first liquid passage 510, the third liquid passage 610, and the first control port 207. The third solenoid valve 240 is used to control the opening and closing of one of the first liquid passage 510 and the third liquid passage 610 with the first control port 207. The fourth solenoid valve 250 is connected to the first liquid passage 510, the third liquid passage 610, and the second control port 208. The fourth solenoid valve 250 is used to control the opening and closing of one of the first liquid passage 510 and the third liquid passage 610 with the second control port 208.

[0070] The second hydraulic control valve 260 can be a two-position four-way valve, serving as a control element for controlling the rotation of the hydraulic motor 100 in the first or second direction. The third solenoid valve 240 and the fourth solenoid valve 250 are both two-position three-way solenoid valves.

[0071] The third hydraulic control valve 270 can be a two-position two-way valve or a two-position three-way valve. When the third hydraulic control valve 270 is a two-position three-way valve, its inlet forms an inlet port 201 to communicate with the second liquid passage 520, and its outlet forms a second flow port 271. The inlet of the second hydraulic control valve 260 forms a first flow port 261 to communicate with the second flow port 271. When the third hydraulic control valve 270 is a two-position three-way valve, the hydraulic control valve assembly 20... The system also has a T1 port, where the inlet of the third hydraulic control valve 270 is connected to the second liquid passage 520. One outlet of the third hydraulic control valve 270 forms a first flow port 261, which is connected to the inlet of the second hydraulic control valve 260. The other outlet of the third hydraulic control valve 270 is connected to the T1 port, which is connected to the liquid storage device 800. When the hydraulic motor 100 stops, the oil output by the cooling pump 500 flows directly through the third hydraulic control valve 270 to the liquid storage device 800, achieving an energy-saving effect. The third hydraulic control valve 270 is used to control the on / off connection between the cooling pump 500 and the second hydraulic control valve 260, thereby enabling the hydraulic motor 100 to stop.

[0072] According to an embodiment of this utility model, another aspect provides an engineering machinery 2, including the aforementioned fan drive system 1. The engineering machinery 2 can be a mining excavator, loader, etc.

[0073] The engineering machinery 2 of this utility model, utilizing the aforementioned fan drive system 1, has a large-flow heat dissipation system, good heat dissipation effect, and high operational stability.

[0074] The following is in conjunction with the appendix Figure 2 Taking the hydraulic control valve group 200, which includes a first hydraulic control valve 210, a first solenoid valve 220, a second solenoid valve 230, and a proportional relief valve 501 (which is an inverse proportional control electro-proportional relief valve 501), as an example, the working process of the fan drive system 1 is described as follows: The controller receives the oil temperature signal t0 from the oil temperature sensor 810. When t0 ≤ the first preset target temperature t1, it does not send control signals to the first solenoid valve 220 and the second solenoid valve 230. The first solenoid valve 220 and the second solenoid valve 230 are not energized. At this time, the first hydraulic control valve 210 is in the neutral position, the hydraulic control valve group 200 is in the second state, and the two oil ports of the hydraulic motor 100 are connected to the liquid storage device 800 through the A port, B port and T port of the hydraulic valve group. The Pp of the cooling pump 500 is connected to the P port, and the P port is cut off. The cooling pump 500 does not output hydraulic oil to the hydraulic motor 100, and the hydraulic motor 100 stops. The controller outputs a preset maximum current signal to the proportional relief valve 501 to control the proportional relief valve 501 to be at the preset minimum pressure. At this time, the displacement output by the cooling pump 500 to the hydraulic control valve group 200 reaches the minimum. When the first preset target temperature t1 < t0 ≤ the second preset target temperature t2, a control signal is sent to the first solenoid valve 220, but no control signal is sent to the second solenoid valve 230. The first solenoid valve 220 is energized, and the second solenoid valve 230 is de-energized. The first control port 207 of the first hydraulic control valve 210 is connected to the hydraulic oil, so that the first hydraulic control valve 210 switches to the upper position. The hydraulic control valve group 200 switches to the first state. The oil output from the Pp port of the cooling pump 500 is connected to one oil port of the hydraulic motor 100 through the hydraulic control valve group 200. The other oil port of the hydraulic motor 100 is connected to the liquid storage device 800 through the hydraulic control valve group 200. The hydraulic motor 100 rotates in the first direction, that is, the hydraulic motor 100 rotates forward. The controller outputs a preset current signal to the proportional relief valve 501 to control the proportional relief valve 501 to be at a preset pressure. At this time, the hydraulic motor 100 works stably at the minimum speed. When the second preset target temperature t2 < t0 < the third preset target temperature t3, the first solenoid valve 220 continues to be energized, and the second solenoid valve 230 continues to be de-energized. The controller controls the pressure of the proportional relief valve 501 to adjust the speed of the hydraulic motor 100 according to the current signal output by the oil temperature signal t0. Specifically, when t0 increases, the current signal decreases, the pressure of the proportional relief valve 501 increases, and the speed of the fan 110 increases. When t0 decreases, the current signal increases, the pressure of the proportional relief valve 501 decreases, and the speed of the fan 110 decreases, thus maintaining the relative stability of the speed of the hydraulic motor 100. When t0 ≥ the third preset target temperature t3, the first solenoid valve 220 is kept energized and the second solenoid valve 230 is kept de-energized. The controller outputs a preset minimum current signal to control the proportional relief valve 501 to be at the preset maximum pressure, so as to maintain the hydraulic motor 100 at the maximum set speed.

[0075] The fan drive system 1 also includes a backflush switch. When the user turns on the backflush switch, the controller controls the hydraulic motor 100 to reverse through the hydraulic control valve group 200. Alternatively, when the user turns off the backflush switch and the automatic backflush conditions are met, the controller controls the hydraulic motor 100 to reverse through the hydraulic control valve group 200. For example, the automatic backflush conditions are when the construction machinery 2 has just started or when the automatic idle function is turned on and the machine is in automatic idle mode. Specifically, the controller sends a control signal to the second solenoid valve 230 but not to the first solenoid valve 220, energizing the second solenoid valve 230 and de-energizing the first solenoid valve 220. The second control port 208 of the first hydraulic control valve 210 is connected to the hydraulic oil, and the first hydraulic control valve 210 switches to the lower position. The hydraulic control valve group 200 switches to the third state, and the hydraulic oil output from the Pp port of the cooling pump 500 is connected to another oil port of the hydraulic motor 100 through the hydraulic control valve group 200. One oil port of the hydraulic motor 100 is connected to the reservoir 800 through the hydraulic control valve group 200. The hydraulic motor 100 rotates in the second direction, that is, the hydraulic motor 100 reverses, and maintains a preset backflush time. The preset backflush time can be a fixed time built into the program, such as 15s, 30s, 45s, 60s, etc., or it can be a user-defined time. The user-defined time can be adjusted through the touch screen in the cab. The driver can activate the automatic idle function via physical buttons in the cab. When the hydraulic motor reverses 100 degrees, the engine speed is set to the speed of the automatic idle function, and the driver cannot operate the machine.

[0076] After the backflushing time ends, the state of the hydraulic motor 100 is determined based on the energization status of the first solenoid valve 220 and the second solenoid valve 230 before the backflushing begins. Then, based on the state of the hydraulic motor 100, the hydraulic motor 100 is either stopped or rotated in the first direction.

[0077] Specifically, before the backflush begins, when the hydraulic motor 100 is in a stopped state, the reverse control of the hydraulic motor 100 is directly executed, and after the hydraulic motor 100 has completed the reverse rotation, it returns to a stopped state. Before backflushing begins, when the hydraulic motor 100 is rotating in the first direction, if t0 < the third preset target temperature t3, the hydraulic motor 100 is first stopped. After the speed sensor detects that the speed is 0, the hydraulic motor 100 is reversed. After the reverse control ends, the hydraulic motor 100 is stopped again, and after the speed sensor detects that the speed is 0, the hydraulic motor 100 resumes rotating in the first direction, and the speed is controlled according to the oil temperature signal t0. If t0 ≥ the third preset target temperature t3, the hydraulic motor 100 is stopped only after t0 < the third preset target temperature t3. After the speed sensor detects that the speed is 0, the hydraulic motor 100 is reversed. After the reverse control ends, the hydraulic motor 100 is stopped again, and after the speed sensor detects that the speed is 0, the hydraulic motor 100 resumes rotating in the first direction, and the speed is controlled according to the oil temperature signal t0.

[0078] Additionally, the backflush switch can be a touch button or a physical button located in the cab. The backflush switch activates the hydraulic motor 100 reverse control, which the driver can manually execute as needed. The hydraulic motor 100 reverse control is automatic and does not require driver intervention. Furthermore, the hydraulic motor 100 reverse control can be performed manually or automatically, with manual control having a higher command level than automatic control. The driver can activate automatic control by turning off the backflush switch.

[0079] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A fan drive system, characterized in that, include: A hydraulic motor (100) has an output shaft for connection to a fan (110); The hydraulic control valve assembly (200) is provided with an inlet (201), a first outlet (203) and a first control port (207). The first outlet (203) is connected to the hydraulic motor (100). The hydraulic control valve assembly (200) switches between at least a first state and a second state depending on whether there is hydraulic pressure at the first control port (207). In the first state, the inlet (201) and the first outlet (203) are connected, and the output shaft rotates. In the second state, the inlet (201) and the first outlet (203) are disconnected, and the output shaft stops rotating. The cooling pump (500) is connected to the first control port (207) through the first liquid channel (510) and to the liquid inlet (201) through the second liquid channel (520); The pilot pump (600) is connected to the first control port (207) through the third liquid channel (610). When the first liquid channel (510) is connected, the third liquid channel (610) is cut off. When the third liquid channel (610) is connected, the first liquid channel (510) is cut off.

2. The fan drive system according to claim 1, characterized in that, Also includes: A first check valve (511) is provided in the first liquid passage (510). The first check valve (511) controls the liquid to flow unidirectionally from the cooling pump (500) to the hydraulic control valve group (200) along the first liquid passage (510). A second check valve (611) is provided in the third liquid passage (610). The second check valve (611) controls the liquid to flow unidirectionally from the pilot pump (600) to the hydraulic control valve group (200) along the third liquid passage (610). The liquid outlet of the first liquid passage (510) and the liquid outlet of the third liquid passage (610) are connected.

3. The fan drive system according to claim 2, characterized in that, Also includes: A pressure reducing valve (512) is provided in the first liquid passage (510), and the pressure reducing valve (512) is located between the heat pump (500) and the first one-way valve (511).

4. The fan drive system according to any one of claims 1-3, characterized in that, The hydraulic control valve assembly (200) further includes a second outlet (204) and a second control port (208). The first outlet (203) is connected to one oil port of the hydraulic motor (100), and the second outlet (204) is connected to the other oil port of the hydraulic motor (100). The first liquid passage (510) and the third liquid passage (610) are both connected to the second control port (208). The hydraulic control valve assembly (200) is also provided with a return port (202), which is adapted to be connected to the liquid storage device (800). The hydraulic control valve assembly (200) also has a third state. In the first state, the return port (202) is connected to the second outlet port (204), and the output shaft rotates along the first direction. In the third state, the inlet port (201) is connected to the second outlet port (204), the return port (202) is connected to the first outlet port (203), and the output shaft rotates along the second direction. The first direction and the second direction are opposite.

5. The fan drive system according to claim 4, characterized in that, The hydraulic control valve assembly (200) is in the second state, where the first outlet (203), the second outlet (204) and the return port (202) are connected, or the first outlet (203) and the second outlet (204) are disconnected, and the inlet (201) and the return port (202) are connected. And / or, the fan drive system (1) further includes a third check valve (300) connected between the liquid inlet (201) and the liquid return port (202), the third check valve (300) controlling the liquid to flow unidirectionally from the liquid return port (202) to the liquid inlet (201).

6. The fan drive system according to claim 4, characterized in that, The hydraulic control valve assembly (200) includes: The first hydraulic control valve (210) has the inlet (201), the first outlet (203), the second outlet (204), the first control port (207) and the second control port (208) all located on the first hydraulic control valve (210). The first solenoid valve (220) is connected to the first liquid channel (510), the third liquid channel (610) and the first control port (207), and is used to control the opening and closing of one of the first liquid channel (510) and the third liquid channel (610) with the first control port (207); The second solenoid valve (230) is connected to the first liquid channel (510), the third liquid channel (610) and the second control port (208), and is used to control the opening and closing of one of the first liquid channel (510) and the third liquid channel (610) with the second control port (208).

7. The fan drive system according to claim 4, characterized in that, The hydraulic control valve assembly (200) includes: The second hydraulic control valve (260) has the first outlet (203), the second outlet (204), and the first control port (207) located on it. The second hydraulic control valve (260) is provided with a first flow port (261). The third hydraulic control valve (270) has an inlet (201) and a second control port (208) located thereon. The third hydraulic control valve (270) has a second flow port (271). The first flow port (261) and the second flow port are connected. The hydraulic control valve group (200) is in a first state, where the first flow port (261) is connected to the first outlet (203) and the second flow port (271) is connected to the inlet (201). The hydraulic control valve group (200) is in a second state, where the second flow port (271) is disconnected from the inlet (201). The hydraulic control valve group (200) is in a third state, where the first flow port (261) is connected to the second outlet (204) and the second flow port (271) is connected to the inlet (201). The third solenoid valve (240) is connected to the first liquid channel (510), the third liquid channel (610) and the first control port (207), and is used to control the opening and closing of one of the first liquid channel (510) and the third liquid channel (610) with the first control port (207); The fourth solenoid valve (250) is connected to the first liquid channel (510), the third liquid channel (610) and the second control port (208), and is used to control the opening and closing of one of the first liquid channel (510) and the third liquid channel (610) with the second control port (208).

8. The fan drive system according to claim 4, characterized in that, Also includes: Oil temperature sensor (810), the oil temperature sensor (810) is used to collect the internal hydraulic oil temperature t0 of the engineering machinery (2); The controller is communicatively connected to the oil temperature sensor (810), the cooling pump (500), and the hydraulic valve assembly (200); When t0 ≤ first preset target temperature t1, the controller controls the hydraulic valve group (200) to switch to the second state; When the first preset target temperature t1 < t0 ≤ the second preset target temperature t2, the controller controls the hydraulic valve group (200) to switch to the first state and controls the cooling pump (500) to output hydraulic oil at minimum pressure so that the output shaft rotates at minimum speed; When the second preset target temperature t2 < t0 < the third preset target temperature t3, the controller controls the hydraulic valve group (200) to switch to the first state, and controls the output pressure of the cooling pump (500) to be directly proportional to the rotational speed of the output shaft and t0. When t0 ≥ the third preset target temperature t3, the controller controls the hydraulic valve group (200) to switch to the first state and controls the cooling pump (500) to output hydraulic oil at maximum pressure so that the output shaft rotates at maximum speed.

9. The fan drive system according to claim 8, characterized in that, Also includes: A backflush switch is connected to the controller. When the backflush switch is open, or when the backflush switch is closed and the automatic backflush condition is met, if the hydraulic control valve group (200) is in the second state, the controller controls the hydraulic control valve group (200) to switch to the third state. If the hydraulic control valve group (200) is in the first state and t0 < the third preset target temperature t3, the controller controls the hydraulic control valve group (200) to switch to the second state first until the output shaft stops rotating, and then switch to the third state. If the hydraulic control valve group (200) is in the first state and t0 ≥ the third preset target temperature t3, t0 is continuously detected until t0 < the third preset target temperature t3. The controller controls the hydraulic control valve group (200) to switch to the second state first until the output shaft stops rotating, and then switch to the third state.

10. An engineering machinery, characterized in that, Includes the fan drive system (1) as described in any one of claims 1-9.

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