CN110566333A - Hydraulic fan system - Google Patents
Hydraulic fan system Download PDFInfo
- Publication number
- CN110566333A CN110566333A CN201910935451.7A CN201910935451A CN110566333A CN 110566333 A CN110566333 A CN 110566333A CN 201910935451 A CN201910935451 A CN 201910935451A CN 110566333 A CN110566333 A CN 110566333A
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- Prior art keywords
- valve
- oil
- hydraulic
- hydraulic pump
- port
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P5/00—Pumping cooling-air or liquid coolants
- F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
- F01P5/04—Pump-driving arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/02—Controlling of coolant flow the coolant being cooling-air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/021—Valves for interconnecting the fluid chambers of an actuator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/023—Excess flow valves, e.g. for locking cylinders in case of hose burst
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Combustion & Propulsion (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a hydraulic fan system, and belongs to the technical field of hydraulic fans. The hydraulic fan system comprises a hydraulic pump assembly, an oil tank, a selection module and an execution assembly, wherein an oil inlet of the hydraulic pump assembly is connected with the oil tank, an oil outlet of the hydraulic pump assembly is connected with the selection module, the selection module comprises a selection valve, a first electromagnetic valve oil path and a second electromagnetic valve oil path which are connected in parallel, and an overflow loop led out from the second electromagnetic valve oil path, the first electromagnetic valve oil path is connected with the execution assembly, an overflow valve is connected onto the overflow loop, the selection valve is connected with the first electromagnetic valve oil path and the second electromagnetic valve oil path, and the selection valve is configured to select a high pressure value between the overflow valve and the execution assembly and correspondingly control the opening degree of the first electromagnetic valve oil. The invention adds the valve block and the overflow loop in the hydraulic fan loop, selects two loops with high pressure, increases the output pressure and flow of the hydraulic pump, and improves the braking power of the engine.
Description
Technical Field
The invention relates to the technical field of hydraulic fans, in particular to a hydraulic fan system.
Background
The downhill process of the walking vehicle is the process of the reverse drag braking of the engine, and the braking is carried out by depending on the friction torque of the engine.
The braking principle of the conventional hydraulic fan is as follows: the hydraulic pump outputs hydraulic oil to the hydraulic motor, and the motor drives the fan to rotate, so that the purpose of heat dissipation of the engine is achieved. The hydraulic fan cooling power is related to parameters such as engine cooling power, fan speed, hydraulic pump speed, and once it is determined that the parameters cannot be changed. The mode has no problem when the vehicle normally runs, and can meet the requirements of heat dissipation and braking power. However, when the vehicle is fully loaded downhill, especially downhill for a long time, the vehicle pulls the engine backwards and the engine needs to provide a higher braking power. In a hydraulic fan, a rigid fan and a silicone oil fan system of a traditional vehicle, an engine of the traditional vehicle can only provide braking power equivalent to heat dissipation power of a fan, and cannot provide larger braking power.
Therefore, it is desirable to provide a hydraulic fan system to solve the technical problem of low braking power when the existing vehicle is running down a long slope.
Disclosure of Invention
The invention aims to provide a hydraulic fan system, which can improve the braking power of an engine by utilizing higher system pressure, improve the safety of a vehicle descending a long slope and properly increase the speed and improve the heat dissipation effect.
In order to realize the purpose, the following technical scheme is provided:
The invention provides a hydraulic fan system which comprises a hydraulic pump assembly, an oil tank, a selection module and an execution assembly, wherein an oil inlet of the hydraulic pump assembly is communicated with the oil tank, an oil outlet of the hydraulic pump assembly is communicated with the selection module, the selection module comprises a selection valve, a first electromagnetic valve oil path and a second electromagnetic valve oil path which are connected in parallel, and an overflow loop led out from the second electromagnetic valve oil path, the first electromagnetic valve oil path is connected with the execution assembly, an overflow valve is connected onto the overflow loop, the selection valve is connected with the first electromagnetic valve oil path and the second electromagnetic valve oil path, and the selection valve is configured to select a high pressure value in the overflow valve and the execution assembly and correspondingly control the opening degrees of the first electromagnetic valve oil path and the second electromagnetic valve oil path.
Furthermore, a first pressure compensation valve and a first electromagnetic valve are connected in series on the first electromagnetic valve oil path, a second pressure compensation valve and a second electromagnetic valve are connected in series on the second electromagnetic valve oil path, and the selection valve is connected with the first pressure compensation valve and the second pressure compensation valve through oil control.
Further, the selector valve is a shuttle valve.
further, the overflow circuit is in communication with the oil tank.
Further, the hydraulic pump assembly comprises a hydraulic pump, the hydraulic pump comprises a main pump and a variable piston, and an oil inlet and an oil outlet of the hydraulic pump are both arranged on the main pump.
The hydraulic pump assembly further comprises a proportional solenoid valve and a pressure limiting valve, a first port of the proportional solenoid valve and a first port of the pressure limiting valve are both communicated with an oil outlet of the hydraulic pump, a second port of the proportional solenoid valve is communicated with a first control end of a valve core of the pressure limiting valve, a third port of the proportional solenoid valve and a third port of the pressure limiting valve are both communicated with an oil tank, and a second port of the proportional solenoid valve can be selectively communicated with the first port or the third port thereof; the second control end of the valve core of the pressure limiting valve is communicated with an oil tank, the end part of the rodless cavity of the variable piston is communicated with the second port of the pressure limiting valve, and the second port of the pressure limiting valve can be selectively communicated with the first port or the third port of the pressure limiting valve.
Further, the first control end of the valve core of the pressure limiting valve is communicated with the adjusting end of the valve core of the proportional solenoid valve.
Furthermore, an orifice is arranged on an oil path for communicating the second port of the proportional solenoid valve with the first control end of the valve core of the pressure limiting valve.
Further, the actuating assembly comprises a hydraulic motor connected with the hydraulic pump assembly and a fan mechanically connected with the hydraulic motor.
Further, the execution assembly further comprises a third electromagnetic valve and a one-way valve which are connected with the hydraulic motor in parallel, when the third electromagnetic valve is electrified, oil of the hydraulic pump assembly directly flows back to the oil tank, and the hydraulic motor stops rotating; the check valve is configured to allow oil of the oil tank to flow to the hydraulic motor when the hydraulic pump assembly stops operating.
Compared with the prior art, the hydraulic fan system provided by the invention is additionally provided with the selection module in the hydraulic fan loop, the selection module comprises the first electromagnetic valve oil path and the second electromagnetic valve oil path which are connected in parallel and the overflow loop led out from the second electromagnetic valve oil path, and the specific working principle is as follows: under the normal running working condition of the vehicle, the first electromagnetic valve oil way is connected, the second electromagnetic valve oil way is disconnected, and the fan runs normally; when an Electronic Control Unit (ECU) of the engine detects that the vehicle is in a long-slope working condition, both the first electromagnetic valve oil way and the second electromagnetic valve oil way are communicated, the overflow loop is opened, and the braking power of the engine can be improved due to the fact that the pressure of the overflow valve is high. According to the invention, a pressure compensation principle is adopted in the added valve block in the hydraulic fan loop, a loop with higher pressure in two paths is selected, the output pressure of an oil outlet of the hydraulic pump assembly is increased, and meanwhile, the first electromagnetic valve oil path and the second electromagnetic valve oil path are logically controlled, so that the fan rotating speed meeting the heat dissipation requirement is maintained, and meanwhile, the overflow valve needs flow output to ensure the system pressure. In this case, the output pressure of the hydraulic pump unit is a higher pressure value, and the flow rate is increased accordingly, and as can be seen from the driving torque and power calculation formula, the pressure of the hydraulic pump unit is increased, the differential pressure is increased, the flow rate is increased, and the absorption power of the hydraulic pump unit is increased, so that the braking power of the engine can be increased.
Drawings
Fig. 1 is a schematic structural diagram of a hydraulic fan system according to an embodiment of the present invention.
Reference numerals:
1-main pump; 2-variable piston; 3-a pressure limiting valve; 4-proportional solenoid valve; 5-a selector valve; 6-first electromagnetic valve oil circuit; 7-a first solenoid valve; 8-a first pressure compensating valve; 9-a second electromagnetic valve oil way; 10-a second solenoid valve; 11-a second pressure compensating valve; 12-an overflow circuit; 13-relief valve; 14-a hydraulic motor; 15-a third solenoid valve; 16-a one-way valve; 17-orifice.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment provides a hydraulic fan system, which is suitable for the working condition that a vehicle is fully loaded on a long slope. As shown in fig. 1, the hydraulic fan system provided by this embodiment includes a hydraulic pump assembly, an oil tank, a selection module and an execution assembly, an oil inlet of the hydraulic pump assembly is communicated with the oil tank, an oil outlet of the hydraulic pump assembly is communicated with the selection module, the selection module includes a selection valve 5, a first solenoid valve oil path 6 and a second solenoid valve oil path 9 connected in parallel, and an overflow loop 12 led out from the second solenoid valve oil path 9, the first solenoid valve oil path 6 is communicated with the execution assembly, an overflow valve 13 is connected to the overflow loop 12, the selection valve 5 is connected to both the first solenoid valve oil path 6 and the second solenoid valve oil path 9, the selection valve 5 is configured to select a high pressure value in both the overflow valve 13 and the execution assembly, and to correspondingly control the opening degrees of the first solenoid valve.
The hydraulic fan system provided by the embodiment adds a selection module in the hydraulic fan circuit, the selection module includes a first solenoid valve oil path 6 and a second solenoid valve oil path 9 which are connected in parallel, and an overflow circuit 12 led out from the second solenoid valve oil path 9, and the specific working principle is as follows: under the normal running working condition of the vehicle, the first electromagnetic valve oil way 6 is connected, the second electromagnetic valve oil way 9 is disconnected, and the fan runs normally; when an Electronic Control Unit (ECU) of the engine detects that a vehicle is in a long-slope working condition, the first electromagnetic valve oil path 6 and the second electromagnetic valve oil path 9 are both communicated, the overflow loop 12 is opened, and the selection valve 5 selects a high-pressure value of the overflow valve 13 due to the fact that the pressure of the overflow valve 13 is high, so that the pressure, the pressure difference and the flow of the hydraulic pump assembly are increased, but the pressure loss is realized by controlling the opening degree of the first electromagnetic valve oil path 6, the pressure of hydraulic oil leading to the execution assembly is guaranteed to be unchanged, and the braking power of the engine is improved on the premise that the rotating speed of a fan is. The pressure compensation principle is adopted in the added valve block in the hydraulic fan loop, the loop with higher pressure in two paths is selected, the output pressure of the oil outlet of the hydraulic pump assembly is increased, and the first electromagnetic valve oil path 6 and the second electromagnetic valve oil path 9 are logically controlled, so that the fan rotating speed meeting the heat dissipation requirement is maintained, and meanwhile, the overflow valve 13 needs flow output to ensure the system pressure. In this case, the output pressure of the hydraulic pump unit is a higher pressure value, and the flow rate is increased accordingly, and it can be known from the calculation formula of the driving torque and the power that the pressure of the hydraulic pump unit is increased, the flow rate is increased, and the absorption power of the hydraulic pump unit is increased, so that the braking power of the engine can be increased.
Further, in order to realize the pressure compensation function of the valve block, preferably, a first pressure compensation valve 8 and a first electromagnetic valve 7 are connected in series on the first electromagnetic valve oil path 6, a second pressure compensation valve 11 and a second electromagnetic valve 10 are connected in series on the second electromagnetic valve oil path 9, and the selection valve 5 is connected with the first pressure compensation valve 8 and the second pressure compensation valve 11 through oil control. To perform the function of the selector valve 5 of selecting high pressure, the selector valve 5 is preferably a shuttle valve. In order to save space, the overflow loop 12 is connected with the oil tank, provides a high pressure value and plays a role in protecting high-pressure oil discharge.
Preferably, the hydraulic pump assembly of the present embodiment includes a hydraulic pump, a proportional solenoid valve 4 and a pressure limiting valve 3, wherein the hydraulic pump includes a main pump 1 and a variable piston 2, and an oil inlet and an oil outlet of the hydraulic pump are both disposed on the main pump 1. The first port of the proportional solenoid valve 4 and the first port of the pressure limiting valve 3 are both communicated with an oil outlet of a hydraulic pump, the second port of the proportional solenoid valve 4 is communicated with a first control end of a valve core of the pressure limiting valve 3, optionally, an orifice 17 is arranged on an oil way for communicating the second port of the proportional solenoid valve 4 with the first control end of the valve core of the pressure limiting valve 3, the third port of the proportional solenoid valve 4 is communicated with an oil tank, when the proportional solenoid valve 4 is powered off, the second port of the proportional solenoid valve 4 is communicated with the third port, and when the proportional solenoid valve 4 is powered on, the first port of the proportional solenoid valve 4 is communicated with the second port. The second control end of the valve core of the pressure limiting valve 3 is communicated with the oil tank. The end part of the rodless cavity of the variable piston 2 is communicated with the second port of the pressure limiting valve 3, and the first control end of the valve core of the pressure limiting valve 3 is communicated with the adjusting end of the valve core of the proportional solenoid valve 4. The pressure limiting valve 3 can limit the maximum pressure of the hydraulic pump, when the pressure value output by the hydraulic pump is greater than the opening pressure of the pressure limiting valve 3, the first port and the second port of the pressure limiting valve 3 are communicated, hydraulic oil enters the rodless cavity of the variable piston 2, the spring of the variable piston 2 is compressed, the discharge capacity of the hydraulic pump is reduced, and the hydraulic fan system is protected. The proportional solenoid valve 4 is a reverse control valve, and when the proportional solenoid valve 4 is not electrified, the hydraulic pump has the maximum displacement; when the proportional solenoid valve 4 is electrified, the more the hydraulic oil quantity entering the pressure limiting valve 3 from the proportional solenoid valve 4 is along with the increase of the current, the smaller the displacement of the hydraulic pump is, and the proportional control of the displacement of the hydraulic pump is realized.
further, the executing assembly of the embodiment comprises a hydraulic motor 14 communicated with the hydraulic pump, a fan mechanically connected with the hydraulic motor 14, and a third electromagnetic valve 15 and a one-way valve 16 which are connected with the hydraulic motor 14 in parallel, when the third electromagnetic valve 15 is electrified, oil of the hydraulic pump directly flows back to an oil tank, the hydraulic motor 14 stops rotating, and the action is suitable for the working condition that when the ambient temperature or the water temperature is low, the rotation of the fan is stopped for rapidly increasing the temperature of the engine; the check valve 16 is configured to allow oil from the oil supply tank to flow to the hydraulic motor 14 when the hydraulic pump is not operating, and is adapted to the condition of just stopping to prevent the hydraulic motor 14 from being sucked empty.
The electric control logic of the hydraulic fan is as follows:
Drive torque
Power of
Wherein, VgIs the displacement of the hydraulic pump, Δ p is the pressure difference at the inlet and outlet of the hydraulic pump, qvIs the flow rate of the hydraulic pump, etamh、ηtIs constant, n is the rotational speed of the hydraulic pump.
Conventional hydraulic fan circuits: when the fan rotates at the highest speed, the system pressure is highest, about 200bar, if the vehicle runs down a slope, the engine speed is low, the hydraulic pump speed is low, and the hydraulic motor and the fan speed is low, because the system pressure is related to the load, the system pressure can be correspondingly reduced after the fan speed is reduced, the output pressure of the hydraulic pump port can only be 100-150bar, and the braking power provided for the engine is small.
The improved hydraulic fan circuit of the embodiment: because the valve block adopts the selector valve 5 and the first pressure compensation valve 8 and the second pressure compensation valve 11, wherein the selector valve 5 can select high pressure in two paths, and introduce the high pressure into two sides of the first pressure compensation valve 8 and the second pressure compensation valve 11, the first pressure compensation valve 8 compares the pressure difference of the first electromagnetic valve oil path 6 and the oil path of the selector valve 5, and the second pressure compensation valve 11 compares the pressure difference of the selector valve 5 and the oil path of the second electromagnetic valve 9, for example: when the pressure of the overflow valve 13 is 300bar and the pressure of the hydraulic motor 14 is 200bar, the pressure at the left side of the first pressure compensation valve 8 is 200bar, the pressure at the right side of the first pressure compensation valve 8 is 300bar, the first pressure compensation valve 8 is partially opened, the pressure at the oil outlet of the hydraulic pump is 300bar, the pressure is reduced to 200bar after passing through the first pressure compensation valve 8, and the pressure loss of the first pressure compensation valve 8 is 100 bar. And the pressure on both sides of the second pressure compensation valve 11 is 300bar, and the state is fully opened at the moment, so that no pressure loss exists. Therefore, in this state, the outlet pressure of the hydraulic pump is 300bar, the pressure at the inlet a of the hydraulic motor 14 is 200bar, and the pressure of the overflow circuit 12 is 300 bar. Therefore, the output pressure of the hydraulic pump is increased, the differential pressure is increased, the flow rate is increased, and the absorption power of the hydraulic pump is increased.
In summary, the conventional hydraulic fan system is 200bar, the pressure of the improved hydraulic system of the embodiment is 300bar, and the braking power can be improved by about 50% at least.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A hydraulic fan system is characterized by comprising a hydraulic pump assembly, an oil tank, a selection module and an execution assembly, an oil inlet of the hydraulic pump assembly is communicated with the oil tank, an oil outlet of the hydraulic pump assembly is communicated with the selection module, the selection module comprises a selection valve (5), a first electromagnetic valve oil way (6) and a second electromagnetic valve oil way (9) which are connected in parallel, and an overflow loop (12) led out from the second electromagnetic valve oil way (9), the first electromagnetic valve oil path (6) is communicated with the execution assembly, an overflow valve (13) is connected on the overflow loop (12), the selector valve (5) is connected with both the first electromagnetic valve oil path (6) and the second electromagnetic valve oil path (9), the selector valve (5) is configured to select a high pressure value in both the relief valve (13) and the actuator assembly, and correspondingly controls the opening degrees of the first solenoid valve oil path (6) and the second solenoid valve oil path (9).
2. The hydraulic fan system according to claim 1, wherein a first pressure compensation valve (8) and a first solenoid valve (7) are connected in series to the first solenoid valve oil path (6), a second pressure compensation valve (11) and a second solenoid valve (10) are connected in series to the second solenoid valve oil path (9), and the selector valve (5) is connected to the first pressure compensation valve (8) and the second pressure compensation valve (11) in an oil control manner.
3. A hydraulic fan system according to claim 1, characterized in that the selector valve (5) is a shuttle valve.
4. Hydraulic fan system according to claim 1, characterized in that the overflow circuit (12) communicates with the oil tank.
5. The hydraulic fan system according to claim 1, characterized in that the hydraulic pump assembly comprises a hydraulic pump comprising a main pump (1) and a variable piston (2), an oil inlet and an oil outlet of the hydraulic pump being both provided on the main pump (1).
6. The hydraulic fan system according to claim 5, characterized in that the hydraulic pump assembly further comprises a proportional solenoid valve (4) and a pressure limiting valve (3), a first port of the proportional solenoid valve (4) and a first port of the pressure limiting valve (3) both communicating with an oil outlet of the hydraulic pump, a second port of the proportional solenoid valve (4) communicating with a first control end of a spool of the pressure limiting valve (3), a third port of the proportional solenoid valve (4) and a third port of the pressure limiting valve (3) both communicating with a tank, a second port of the proportional solenoid valve (4) being able to selectively communicate with its first port or third port; the second control end of the valve core of the pressure limiting valve (3) is communicated with an oil tank, the end part of the rodless cavity of the variable piston (2) is communicated with the second port of the pressure limiting valve (3), and the second port of the pressure limiting valve (3) can be selectively communicated with the first port or the third port of the pressure limiting valve.
7. Hydraulic fan system according to claim 6, characterized in that the first control end of the spool of the pressure limiting valve (3) communicates with the regulation end of the spool of the proportional solenoid valve (4).
8. The hydraulic fan system according to claim 7, characterized in that an orifice (17) is provided on the oil passage where the second port of the proportional solenoid valve (4) communicates with the first control end of the spool of the pressure limiting valve (3).
9. The hydraulic fan system of claim 1, wherein the implement assembly includes a hydraulic motor (14) connected to the hydraulic pump assembly and a fan mechanically connected to the hydraulic motor (14).
10. The hydraulic fan system according to claim 9, characterized in that the actuator assembly further comprises a third solenoid valve (15) and a non-return valve (16) connected in parallel with the hydraulic motor (14), the oil of the hydraulic pump assembly flowing directly back to the oil tank when the third solenoid valve (15) is energized, the hydraulic motor (14) stalling; the check valve (16) is configured to allow oil from the oil tank to flow to the hydraulic motor (14) when the hydraulic pump assembly is just stopped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910935451.7A CN110566333B (en) | 2019-09-29 | 2019-09-29 | Hydraulic fan system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910935451.7A CN110566333B (en) | 2019-09-29 | 2019-09-29 | Hydraulic fan system |
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| CN110566333A true CN110566333A (en) | 2019-12-13 |
| CN110566333B CN110566333B (en) | 2020-11-03 |
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| CN201910935451.7A Active CN110566333B (en) | 2019-09-29 | 2019-09-29 | Hydraulic fan system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113062889A (en) * | 2021-03-23 | 2021-07-02 | 三一重机有限公司 | Heat dissipation system and engineering machinery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20060196179A1 (en) * | 2005-03-01 | 2006-09-07 | Arun Kesavan | Load-sensing integrated brake and fan hydraulic system |
| CN105822613A (en) * | 2016-05-27 | 2016-08-03 | 徐工集团工程机械股份有限公司科技分公司 | Integrated valve block based on load feedback control and system based on load feedback control |
| CN206830549U (en) * | 2017-01-06 | 2018-01-02 | 潍柴动力股份有限公司 | A kind of hydraulic control system of fan |
| US9945396B2 (en) * | 2016-02-23 | 2018-04-17 | Caterpillar Inc. | Fluid systems for machines with integrated energy recovery circuit |
-
2019
- 2019-09-29 CN CN201910935451.7A patent/CN110566333B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060196179A1 (en) * | 2005-03-01 | 2006-09-07 | Arun Kesavan | Load-sensing integrated brake and fan hydraulic system |
| US9945396B2 (en) * | 2016-02-23 | 2018-04-17 | Caterpillar Inc. | Fluid systems for machines with integrated energy recovery circuit |
| CN105822613A (en) * | 2016-05-27 | 2016-08-03 | 徐工集团工程机械股份有限公司科技分公司 | Integrated valve block based on load feedback control and system based on load feedback control |
| CN206830549U (en) * | 2017-01-06 | 2018-01-02 | 潍柴动力股份有限公司 | A kind of hydraulic control system of fan |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113062889A (en) * | 2021-03-23 | 2021-07-02 | 三一重机有限公司 | Heat dissipation system and engineering machinery |
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