Hydraulic fan system

Abstract

The utility model provides a hydraulic fan system which comprises a controller, an engine, a fan pump, a control valve group, at least two radiator groups and a pressure sensor, the engine is connected with the fan pump, the pressure sensor is arranged at an oil outlet of the fan pump, the oil outlet of the fan pump is connected with an oil inlet of the control valve group, and the radiator groups are connected in parallel. The control valve sets and the radiator sets are equal in number and connected in series in a one-to-one correspondence mode so as to supply oil to power mechanisms of the radiator sets. The controller is electrically connected with the pressure sensor and the fan pump to control the displacement of the fan pump, the controller is electrically connected with the control valve set to control opening and closing of an oil way between the control valve set and the radiator set, and the controller is electrically connected with the radiator set to obtain the temperature of the heat dissipation loop. According to the utility model, the control mechanism is additionally arranged, so that at least two fan motors are driven by one fan pump, the cost is reduced, the pipeline is simplified, the safety of an oil path is ensured, and meanwhile, rapid temperature rise in a low-temperature environment can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of construction machinery, in particular to a hydraulic fan system. Background Art

[0002] Due to space limitations in large construction machinery, the radiator fan usually cannot be directly driven by the engine, and generally an independent hydraulic drive system is used to drive the fan for heat dissipation. For example, in excavators and the like, a small-displacement fan pump is used in cooperation with a fan motor to drive the fan. One fan needs to be adapted to a group of small-displacement fan pumps and fan motors. And large construction machinery such as excavators generally has multiple radiators, including multiple fans, which requires matching multiple groups of small-displacement fan pumps and fan motors. There are the following defects: First, not only the number of fan pumps increases, but also the number of power take-off ports of the engine is limited, which is not enough to supply the working devices of products such as excavators and multiple fan pumps for simultaneous use, and an additional power take-off device needs to be added, resulting in a significant increase in cost. Second, multiple fan pumps all need to be provided with oil suction pipelines, oil outlet pipelines, oil drain pipelines, etc., the pipelines are complex and the risk of oil leakage increases. Third, the rotation of the fan is inevitably caused when the engine starts, which not only increases energy consumption, but also is not conducive to the rapid increase of the temperature of hydraulic oil and the like to the optimal working temperature in a low-temperature environment. Content of the Utility Model

[0003] In order to overcome at least one of the above-mentioned defects of the prior art, the utility model provides a hydraulic fan system, which realizes that one fan pump drives at least two fan motors by adding a control mechanism, not only reduces the cost, simplifies the pipeline, ensures the safety of the oil circuit, but also can realize rapid heating in a low-temperature environment.

[0004] The utility model provides a hydraulic fan system, including: a controller, an engine, a fan pump, a control valve group, a radiator group and a pressure sensor. The engine is connected to the fan pump. The pressure sensor is arranged at the oil outlet of the fan pump. The oil outlet of the fan pump is connected to the oil inlet of the control valve group. The radiator group is provided with at least two groups in parallel, and the number of the control valve groups is equal to the number of the radiator groups and is connected in series one by one to supply oil to the power mechanism of the radiator group;

[0005] The controller is electrically connected to the pressure sensor and the fan pump to control the displacement of the fan pump, the controller is electrically connected to the control valve group to control the opening and closing of the oil circuit between the control valve group and the radiator group, and the controller is electrically connected to the radiator group to obtain the temperature of the heat dissipation circuit.

[0006] As a preferred embodiment, in the utility model, the fan pump is provided with an electro-hydraulic proportional relief valve, and the electro-hydraulic proportional relief valve is electrically connected to the controller.

[0007] As a preferred embodiment, in the present utility model, the control valve group includes an electro-hydraulic proportional relief valve and a pilot-operated directional control valve connected thereto. The electro-hydraulic proportional relief valve is electrically connected to the controller, and the inlet port of the pilot-operated directional control valve is connected to the outlet port of the fan pump.

[0008] As a preferred embodiment, in the present utility model, the radiator group includes a fan motor, a fan, a radiator, and a temperature sensor. The outlet port of the pilot-operated directional control valve is connected to the inlet port of the fan motor. The fan motor is used to drive the fan to dissipate heat from the radiator. The temperature sensor is installed in the heat dissipation circuit of the radiator group and is electrically connected to the controller.

[0009] As a preferred embodiment, in the present utility model, the engine is connected to a pilot pump via a fan pump. The outlet port of the pilot pump is connected to the inlet port of the electro-hydraulic proportional relief valve.

[0010] As a preferred embodiment, in the present utility model, an overflow valve is provided at the outlet port of the pilot pump.

[0011] As a preferred embodiment, in the present utility model, the suction ports of the pilot pump and the fan pump are both connected to the hydraulic oil tank. The drain ports of the pilot pump, the fan pump, the radiator group, and the control valve group are all connected to the hydraulic oil tank.

[0012] As a preferred embodiment, in the present utility model, the fan pump is a large-displacement piston pump. The maximum displacement of the fan pump is not less than the oil volume required for at least two groups of radiator groups to dissipate heat at full speed. The electro-hydraulic proportional relief valve is inversely proportional control.

[0013] As a preferred embodiment, in the present utility model, the pilot-operated directional control valve is in a normally open state, and the electro-hydraulic proportional relief valve is directly proportional control.

[0014] As a preferred embodiment, in the present utility model, the radiator group includes a hydraulic oil radiator group, an engine water-cooled radiator group, and an engine inter-cooled radiator group arranged in parallel. The hydraulic oil radiator group, the engine water-cooled radiator group, and the engine inter-cooled radiator group are all electrically connected to the controller;

[0015] The hydraulic oil radiator group is connected in series with a first control valve group. The engine water-cooled radiator group is connected in series with a second control valve group. The engine inter-cooled radiator group is connected in series with a third control valve group. The inlet ports of the first control valve group, the second control valve group, and the third control valve group are all connected to the outlet port of the fan pump.

[0016] The beneficial effects of the hydraulic fan system provided by the present utility model are as follows:

[0017] By connecting a control valve group in series with each radiator group, the control mechanism is used to achieve independent heat dissipation control for each radiator group. Only one fan pump is required for driving, which greatly reduces the number of fan pumps, not only reducing costs, but also simplifying the pipeline, ensuring the safety of the oil circuit, and enabling rapid temperature rise in low-temperature environments. Brief Description of the Drawings

[0018] Figure 1 It is a schematic electrical principle diagram of the hydraulic fan system of the present utility model.

[0019] Among them, the meanings of the reference numerals are as follows:

[0020] 1. Controller; 2. Engine; 3. Fan pump; 4. Control valve group; 41. First electro-hydraulic proportional relief valve; 42. Second electro-hydraulic proportional relief valve; 43. Third electro-hydraulic proportional relief valve; 44. First hydraulic control directional valve; 45. Second hydraulic control directional valve; 46. Third hydraulic control directional valve; 5. Radiator group; 51. Hydraulic oil radiator group; 511. First fan motor; 512. First fan; 513. Hydraulic oil radiator; 514. First temperature sensor; 52. Engine water-cooled radiator group; 521. Second fan motor; 522. Second fan; 523. Water-cooled radiator; 524. Second temperature sensor; 53. Engine intercooler radiator group; 531. Third fan motor; 532. Third fan; 533. Intercooler radiator; 534. Third temperature sensor; 6. Pressure sensor; 7. Electro-hydraulic proportional relief valve; 8. Pilot pump; 9. Relief valve; 10. Hydraulic oil tank. Detailed Embodiments

[0021] For better understanding and implementation, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.

[0022] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model.

[0024] Refer toFigure 1 , the present utility model provides a hydraulic fan system, comprising: a controller 1, an engine 2, a fan pump 3, a control valve group 4, a radiator group 5 and a pressure sensor 6. The engine 2 is connected to the fan pump 3. The pressure sensor 6 is arranged at the oil outlet of the fan pump 3. The oil outlet of the fan pump 3 is connected to the oil inlet of the control valve group 4. At least two groups of radiator groups 5 are arranged in parallel. The number of the control valve groups 4 is equal to the number of the radiator groups 5 and they are connected in series one by one to supply oil to the power mechanism of the radiator group 5. The controller 1 is electrically connected to the pressure sensor 6 and the fan pump 3 to control the displacement of the fan pump 3. The controller 1 is electrically connected to the control valve group 4 to control the opening and closing of the oil circuit between the control valve group 4 and the radiator group 5. The controller 1 is electrically connected to the radiator group 5 to obtain the temperature of the heat dissipation circuit.

[0025] The engine 2 is used to drive the fan pump 3 to rotate. The fan pump 3 is used to supply oil to the control valve group 4 and the radiator group 5. The control valve group 4 is used to control the opening and closing and the opening ratio of the oil circuit between it and the series-connected radiator group 5. The radiator group 5 is used to dissipate heat from the radiators therein. The pressure sensor 6 is used to collect the pressure of the fan pump 3 and transmit it to the controller 1. The controller 1 is used to collect temperature and pressure signals, and control the displacement of the fan pump 3 and the opening and closing and the opening ratio of the control valve group 4.

[0026] In this way, by connecting a control valve group in series with each radiator group, the separate control of heat dissipation of each radiator group can be realized by using the control mechanism, so that whether each radiator dissipates heat and the heat dissipation speed, etc. can be controlled separately. Only one fan pump is needed for driving, which greatly reduces the number of fan pumps, not only reduces the cost and energy consumption, but also simplifies the pipeline and ensures the safety of the oil circuit. At the same time, the start of the engine does not necessarily cause the radiator to dissipate heat. By controlling according to the temperature of the radiator circuit, the energy consumption can be reduced, and rapid heating in a low-temperature environment can be achieved.

[0027] Specifically, the fan pump 3 is provided with an electro-hydraulic proportional relief valve 7, and the electro-hydraulic proportional relief valve 7 is electrically connected to the controller 1. The controller 1 adjusts the pressure and displacement of the fan pump 3 through the electro-hydraulic proportional relief valve 7.

[0028] In the present utility model, the fan pump 3 is a large-displacement piston pump. The maximum displacement of the fan pump 3 is not less than the oil quantity required for the full-speed heat dissipation of at least two groups of radiator groups 5. The electro-hydraulic proportional relief valve 7 is inversely proportional control.

[0029] The control valve group 4 includes an electro-hydraulic proportional reducing valve and a hydraulic control reversing valve connected thereto. The electro-hydraulic proportional reducing valve is electrically connected to the controller 1. The oil inlet of the hydraulic control reversing valve is connected to the oil outlet of the fan pump 3. The fan pump 3 supplies oil to the hydraulic control reversing valve. The controller 1 controls the opening and closing and the opening degree of the electro-hydraulic proportional reducing valve to realize the opening, closing and reversing of the hydraulic control reversing valve. In the present utility model, the hydraulic control reversing valve is in a normally open state, and the electro-hydraulic proportional reducing valve is directly proportional control.

[0030] The engine 2 is connected with a pilot pump 8 via a fan pump 3. The oil outlet of the pilot pump 8 is connected to the oil inlet of an electro-hydraulic proportional pressure reducing valve. The pilot pump 8 supplies oil to a hydraulic control reversing valve through the electro-hydraulic proportional pressure reducing valve.

[0031] An overflow valve 9 is provided at the oil outlet of the pilot pump 8 to play a protective role.

[0032] The oil suction ports of the pilot pump 8 and the fan pump 3 are both connected to a hydraulic oil tank 10. The oil drain ports of the pilot pump 8, the fan pump 3, the radiator group 5 and the control valve group 4 are all connected to the hydraulic oil tank 10. The hydraulic oil tank 10 is the source and recovery place of the hydraulic oil.

[0033] The radiator group 5 includes a fan motor, a fan, a radiator and a temperature sensor. The oil outlet of the hydraulic control reversing valve is connected to the oil inlet of the fan motor. The fan motor is used to drive the fan to dissipate heat from the radiator. The temperature sensor is installed in the heat dissipation circuit of the radiator group 5 and is electrically connected to the controller 1. The hydraulic control reversing valve supplies oil to the fan motor to drive the fan to rotate through the fan motor, so as to dissipate heat from the radiator. The temperature sensor can collect the temperature of the heat dissipation circuit and transmit it to the controller 1 to facilitate the controller 1 to control whether the heat dissipation operation is started.

[0034] The radiator group 5 of the present utility model includes a hydraulic oil radiator group 51, an engine water-cooled radiator group 52 and an engine inter-cooled radiator group 53 which are arranged in parallel. The hydraulic oil radiator group 51, the engine water-cooled radiator group 52 and the engine inter-cooled radiator group 53 are all electrically connected to the controller 1.

[0035] A first control valve group is connected in series with the hydraulic oil radiator group 51, a second control valve group is connected in series with the engine water-cooled radiator group 52, and a third control valve group is connected in series with the engine inter-cooled radiator group 53. The oil inlets of the first control valve group, the second control valve group and the third control valve group are all connected to the oil outlet of the fan pump 3.

[0036] More specifically, the hydraulic oil radiator group 51 includes a first fan motor 511, a first fan 512, a hydraulic oil radiator 513 and a first temperature sensor 514. The first control valve group includes a first electro-hydraulic proportional pressure reducing valve 41 and a first hydraulic control reversing valve 44.

[0037] The engine water-cooled radiator group 52 includes a second fan motor 521, a second fan 522, a water-cooled radiator 523 and a second temperature sensor 524. The second control valve group includes a second electro-hydraulic proportional pressure reducing valve 42 and a second hydraulic control reversing valve 45.

[0038] The engine inter-cooled radiator group 53 includes a third fan motor 531, a third fan 532, an inter-cooled radiator 533 and a third temperature sensor 534. The third control valve group includes a third electro-hydraulic proportional pressure reducing valve 43 and a third hydraulic control reversing valve 46.

[0039] Based on the above structure, the principle of the hydraulic fan system of the present utility model is as follows:

[0040] Assume that the optimal working temperature of the hydraulic oil is T10, the oil temperature when the first fan 512 is required to start working is T11, the oil temperature when the first fan 512 is required to work at full speed is T12, and the temperature collected by the first temperature sensor 514 is T1;

[0041] Assume that the optimal working temperature of the engine coolant is T20, the oil temperature when the second fan 522 is required to start working is T21, the oil temperature when the second fan 522 is required to work at full speed is T22, and the temperature collected by the second temperature sensor 524 is T2;

[0042] Assume that the optimal working temperature of the engine intercooler is T30, the oil temperature when the third fan 532 is required to start working is T31, the oil temperature when the third fan 532 is required to work at full speed is T32, and the temperature collected by the third temperature sensor 534 is T3;

[0043] Assume that the real-time current output by the controller 1 to the electro-hydraulic proportional relief valve 7 of the fan pump 3 is I, the real-time current output by the controller 1 to the first electro-hydraulic proportional reducing valve 41 is I1, the real-time current output by the controller 1 to the second electro-hydraulic proportional reducing valve 42 is I2, and the real-time current output by the controller 1 to the third electro-hydraulic proportional reducing valve 43 is I3.

[0044] When the whole machine is just started in winter, at this time, the hydraulic oil temperature T1 < T10, the engine coolant water temperature T2 < T20, and the intercooler temperature T3 < T30 collected by the first temperature sensor 514, the second temperature sensor 524, and the third temperature sensor 534. The output current I of the controller 1 to the electro-hydraulic proportional relief valve 7 of the fan pump 3 is the maximum value, making it in the lowest pressure state. At this time, the fan pump 3 works with a small displacement to maintain the lubrication of the housing. At the same time, the output currents I1, I2, and I3 of the controller 1 to the first electro-hydraulic proportional reducing valve 41, the second electro-hydraulic proportional reducing valve 42, and the third electro-hydraulic proportional reducing valve 43 are the maximum values. Since the first electro-hydraulic proportional reducing valve 41, the second electro-hydraulic proportional reducing valve 42, and the third electro-hydraulic proportional reducing valve 43 are all fully open, the hydraulic oil provided by the pilot pump 8 acts on the corresponding first hydraulic control reversing valve 44, second hydraulic control reversing valve 45, and third hydraulic control reversing valve 46 through the first electro-hydraulic proportional reducing valve 41, second electro-hydraulic proportional reducing valve 42, and third electro-hydraulic proportional reducing valve 43, causing the first hydraulic control reversing valve 44, second hydraulic control reversing valve 45, and third hydraulic control reversing valve 46 to completely reverse. The inlet oil paths of the first fan motor 511, second fan motor 521, and third fan motor 531 are all cut off, the first fan motor 511, second fan motor 521, and third fan motor 531 do not work, and the first fan 512, second fan 522, and third fan 532 do not rotate.

[0045] When the intercooler temperature T3 of the whole machine is greater than T31, the hydraulic oil temperature T1 is less than T10, and the water temperature T2 is less than T20, the output current I3 of the controller 1 to the third electro-hydraulic proportional relief valve 43 decreases, the spool of the third hydraulic control directional valve 46 moves upward, the hydraulic oil output of the fan pump 3 is supplied to the third fan motor 531, and the third fan 532 starts to work. When T3 continues to rise and I3 has decreased to the minimum set value, the output current I of the controller 1 to the electro-hydraulic proportional relief valve 7 of the fan pump 3 decreases, the output pressure of the fan pump 3 increases, the speed of the third fan 532 increases, and the cooling capacity increases. When T3 reaches the equilibrium state, the current I stops decreasing. If at this time T2 > T21, the output current I2 of the controller 1 decreases, the spool of the second hydraulic control directional valve 45 moves upward, and the second fan motor 521 starts to work. When T2 reaches the equilibrium state, I2 stops adjusting. The change of T3 and I3 is the same.

[0046] When T3 ≥ T32, I decreases to the minimum set value, the pressure of the electro-hydraulic proportional relief valve 7 of the fan pump 3 is the maximum, I3 decreases to the minimum set value, and the third fan motor 531 operates at full speed. The same applies to T2 and I2, T1 and I1.

[0047] When T3 ≥ T32 and T1, T2 decrease (T11 < T1 < T12, T21 < T2 < T22), I remains unchanged, I1 and I2 increase, the flow rates of the first fan motor 511 and the second fan motor 521 decrease, and the speeds decrease until T1 and T2 maintain equilibrium.

[0048] The technical means disclosed in the solution of the present utility model are not limited to the technical means disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present utility model.

Claims

1. A hydraulic fan system, characterized in that, Comprising: A controller, an engine, a fan pump, a control valve group, a radiator group, and a pressure sensor. The engine is connected to the fan pump. The pressure sensor is provided at the oil outlet of the fan pump. The oil outlet of the fan pump is connected to the oil inlet of the control valve group. At least two groups of the radiator group are arranged in parallel. The number of the control valve groups is equal to the number of the radiator groups and they are connected in series one by one to supply oil to the power mechanism of the radiator group; The controller is electrically connected to the pressure sensor and the fan pump to control the displacement of the fan pump. The controller is electrically connected to the control valve group to control the opening and closing of the oil circuit between the control valve group and the radiator group. The controller is electrically connected to the radiator group to obtain the temperature of the heat dissipation circuit.

2. The hydraulic fan system according to claim 1, wherein: The fan pump is provided with an electro-hydraulic proportional relief valve, and the electro-hydraulic proportional relief valve is electrically connected to the controller.

3. The hydraulic fan system according to claim 1, wherein: The control valve group includes an electro-hydraulic proportional reducing valve and a pilot-operated directional control valve connected thereto. The electro-hydraulic proportional reducing valve is electrically connected to the controller. The oil inlet of the pilot-operated directional control valve is connected to the oil outlet of the fan pump.

4. The hydraulic fan system according to claim 3, characterized in that: The radiator group includes a fan motor, a fan, a radiator, and a temperature sensor. The oil outlet of the pilot-operated directional control valve is connected to the oil inlet of the fan motor. The fan motor is used to drive the fan to dissipate heat from the radiator. The temperature sensor is installed in the heat dissipation circuit of the radiator group and is electrically connected to the controller.

5. The hydraulic fan system according to claim 3, wherein: The engine is connected with a pilot pump via the fan pump. The oil outlet of the pilot pump is connected to the oil inlet of the electro-hydraulic proportional reducing valve.

6. The hydraulic fan system according to claim 5, wherein: An overflow valve is provided at the oil outlet of the pilot pump.

7. The hydraulic fan system according to claim 5, characterized in that: The oil suction ports of the pilot pump and the fan pump are both connected to a hydraulic oil tank. The oil drain ports of the pilot pump, the fan pump, the radiator group, and the control valve group are all connected to the hydraulic oil tank.

8. The hydraulic fan system according to claim 2, wherein: The fan pump is a large-displacement piston pump. The maximum displacement of the fan pump is not less than the oil quantity required for at least two groups of the radiator group to dissipate heat at full speed. The electro-hydraulic proportional relief valve is in inverse proportional control.

9. The hydraulic fan system according to claim 3, wherein: The pilot-operated directional control valve is in a normally open state. The electro-hydraulic proportional reducing valve is in direct proportional control.

10. The hydraulic fan system according to claim 1, characterized in that: The radiator group includes a hydraulic oil radiator group, an engine water-cooled radiator group, and an engine intercooler radiator group arranged in parallel. The hydraulic oil radiator group, the engine water-cooled radiator group, and the engine intercooler radiator group are all electrically connected to the controller; The hydraulic oil radiator group is connected in series with a first control valve group. The engine water-cooled radiator group is connected in series with a second control valve group. The engine intercooler radiator group is connected in series with a third control valve group. The oil inlets of the first control valve group, the second control valve group, and the third control valve group are all connected to the oil outlet of the fan pump.

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