CN211449237U - Independent heat dissipation hydraulic system and engineering machinery provided with same - Google Patents
Independent heat dissipation hydraulic system and engineering machinery provided with same Download PDFInfo
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- CN211449237U CN211449237U CN201922131110.2U CN201922131110U CN211449237U CN 211449237 U CN211449237 U CN 211449237U CN 201922131110 U CN201922131110 U CN 201922131110U CN 211449237 U CN211449237 U CN 211449237U
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Abstract
The utility model relates to an independent heat dissipation hydraulic system and set up hydraulic system's engineering machine tool, independent heat dissipation hydraulic system include the hydraulic pump and fan drive oil circuit and the delay control oil circuit that connect in parallel each other. When the main oil way is communicated with the delay control oil way, oil in the main oil way flows through the pilot control oil port to push the valve core of the hydraulic control reversing valve to reverse, and meanwhile, the oil in the main oil way fills the accumulator; when the main oil way and the delay control oil way are blocked, the accumulator releases the stored oil to act on the pilot control oil port so that the valve core of the hydraulic control reversing valve keeps a reversing state; when the oil in the energy accumulator stops releasing, the valve core of the hydraulic control reversing valve reverses and resets under the action of the spring force. The hydraulic system can avoid pressure impact caused by quick switching of the oil way, so that the motor can smoothly stop in the process of reversing and stopping operation.
Description
Technical Field
The invention relates to a hydraulic system, in particular to an independent heat dissipation hydraulic system and an engineering machine with the same.
Background
The large-scale excavator at home and abroad uses the larger power of the engine, if the engine is used for directly driving the fan to work for heat dissipation, although the heat dissipation efficiency is higher, the work energy waste is serious in winter, so in order to save fuel consumption, the heat dissipation system of the large-scale excavator mostly adopts an independent heat dissipation hydraulic system at present, and the heat dissipation fan can reversely blow to remove dust on the surface of the heat sink, so that the heat dissipation effect is prevented from being influenced by the fact that the dust covers the surface of the heat sink. The hydraulic oil has high temperature, which affects the working performance of the hydraulic element, even causes the failure of the hydraulic element, and how to avoid the pressure impact, the suction air and other phenomena when the heat dissipation pump and the heat dissipation motor work, so as to improve the working reliability of the heat dissipation system, which is a key point for ensuring the reliable work of the excavator and also is an important embodiment of the product competitiveness.
In the prior art, the independent heat dissipation hydraulic system of the excavator has the functions of realizing heat dissipation and cleaning dust on the surface of a radiator by using the forward and reverse rotation of a fan, the working state of a motor is that oil returns from an oil inlet A and an oil outlet B to dissipate heat of the radiator in the forward rotation process, the working state of the motor is that oil returns from the oil inlet A and the oil inlet B when a solenoid directional valve is electrified, the fan is driven to rotate reversely, and the fan plays a role in cleaning dust, lint and other dirt attached to the surface of the radiator.
However, when the motor needs to stop when the reverse rotation work of the motor, the electromagnetic directional valve is switched to the forward rotation work oil path state immediately after power failure and reversing, the work state of the motor is suddenly changed from the return oil at the port A to the oil at the port A, the motor continues to rotate under the action of inertia force, and a closed oil path between the hydraulic variable pump and the oil inlet of the motor immediately forms high-pressure impact to act on the motor, so that the service life of the motor is influenced. And the motor returns oil and directly returns to the oil tank, and the oil return backpressure is too little, and the motor easily produces and inhales the sky, influences the motor life-span.
Disclosure of Invention
The invention provides an independent heat dissipation hydraulic system for overcoming the defects in the prior art, which can avoid pressure impact caused by quick switching of oil ways and enable the motor to smoothly stop in the process of reversing and stopping.
The technical scheme adopted by the invention is as follows: an independent heat dissipation hydraulic system comprises a hydraulic pump, a fan driving oil path and a delay control oil path which are connected in parallel;
the fan driving oil path comprises a hydraulic control reversing valve and a hydraulic motor which are sequentially connected with the hydraulic pump, the hydraulic control reversing valve is used for controlling the positive and negative rotation of the hydraulic motor, the fan driving oil path also comprises an overflow valve used for controlling the pressure of the independent heat dissipation hydraulic system, and the outlet of the overflow valve is connected to a hydraulic oil tank through a pipeline;
the delay control oil way comprises an electromagnetic directional valve and an energy accumulator which are sequentially connected with the hydraulic pump, the delay control oil way also comprises a delay valve, an oil inlet of the delay valve is connected with an oil return port of the electromagnetic directional valve through a pipeline, an oil outlet of the delay valve is connected with the hydraulic oil tank, and a working oil port of the electromagnetic directional valve is respectively connected with a pilot control oil port of the hydraulic directional valve and the energy accumulator through pipelines;
when the main oil way is communicated with the delay control oil way, oil in the main oil way flows through the pilot control oil port to push the valve core of the hydraulic control reversing valve to reverse, and meanwhile, the oil in the main oil way fills the accumulator;
when the main oil way and the delay control oil way are blocked, the accumulator releases stored oil and flows through the delay valve, the delay valve controls the release speed of the oil in the accumulator, and the pre-charging pressure of the accumulator continuously acts on the pilot control oil port in the oil release process to keep the valve core of the hydraulic control reversing valve in a reversing state; when the oil in the energy accumulator stops releasing, the valve core of the hydraulic control reversing valve reverses and resets under the action of the spring force. The volume of the accumulator and the flow parameters of the delay valve are determined according to the time the fan is stopped.
Furthermore, the hydraulic control reversing valve is a two-position four-way hydraulic control reversing valve or a three-position four-way hydraulic control reversing valve.
Furthermore, the hydraulic control reversing valve is a three-position four-way hydraulic control reversing valve, and the middle position function of the three-position four-way hydraulic control reversing valve is H-shaped.
Further, the hydraulic control reversing valve is in a left position or a right position in a normal state.
Further, the hydraulic pump is a fixed displacement pump or a variable displacement pump.
The hydraulic control reversing valve further comprises a first oil supplementing one-way valve and a second oil supplementing one-way valve, the outlet of the overflow valve is respectively connected to two working oil ports of the hydraulic control reversing valve through pipelines, and the first oil supplementing one-way valve and the second oil supplementing one-way valve are connected to the pipeline between the outlet of the overflow valve and the two working oil ports of the hydraulic control reversing valve;
the oil outlet of the first oil supplementing one-way valve is connected with the first oil outlet of the hydraulic control reversing valve, and the oil outlet of the second oil supplementing one-way valve is connected with the second oil outlet of the hydraulic control reversing valve.
Furthermore, the delay control oil path further comprises a one-way throttle valve, and the one-way throttle valve is connected to a pipeline between the electromagnetic directional valve and the energy accumulator.
And the hydraulic control reversing valve is characterized by further comprising an oil return back pressure valve, and an oil return pipeline of the hydraulic control reversing valve and an oil return pipeline of the overflow valve are converged and then return to the hydraulic oil tank through the oil return back pressure valve.
The invention also provides engineering machinery comprising the independent heat dissipation hydraulic system.
Further, the construction machine further comprises a hydraulic excavator.
The beneficial effects produced by the invention comprise: 1. the system is provided with a delay valve, a one-way throttle valve and an energy accumulator, so that the hydraulic control reversing valve can quickly reverse when the reverse rotation is started, and the control pressure of the hydraulic control reversing valve can be delayed and released when the reverse rotation is stopped, thereby solving the problem of reverse dragging of the motor generated by suddenly switching to a forward rotation oil way due to power failure of the electromagnetic reversing valve in the existing scheme, reducing the pressure impact of the pump and the motor when the reverse rotation is stopped, and prolonging the service life of the pump and the motor.
2. The system is provided with back pressure valve, installs the oil supplementing check valve after the liquid accuse switching-over valve simultaneously, has reduced the loss of pressure when mending oil when having improved the oil supplementing pressure, solves the motor suction problem that current scheme motor stopped the process and produces, promotes the life of motor.
Drawings
Fig. 1 is a schematic diagram of a connection structure of an independent heat dissipation hydraulic system according to an embodiment of the present invention;
in the figure: 1-a hydraulic variable pump; 2-a delay valve; 3-an overflow valve; 4-an electromagnetic directional valve; 5-one-way throttle valve; 6-an accumulator; 7-a hydraulic control reversing valve; 8-oil-supplementing one-way valve; 9-oil-supplementing one-way valve; 10-a motor; 11-a fan; 12-return back pressure valve 13-hydraulic tank.
Detailed Description
The present invention is explained in further detail below with reference to the drawings and the specific embodiments, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Fig. 1 is a schematic diagram of a connection structure of an independent heat dissipation hydraulic system according to an embodiment of the present invention, please refer to fig. 1, in which an oil inlet of a hydraulic variable pump 1 is connected to a hydraulic oil tank 13, and an oil outlet is connected to an oil inlet of an overflow valve 3, an oil inlet of an electromagnetic directional valve 4, and an oil inlet of a hydraulic directional valve 7; an oil inlet of the overflow valve 3 is connected with the hydraulic variable pump 1, and an oil outlet of the overflow valve is connected with an oil inlet of the oil return back pressure valve 12; an oil outlet of the oil return back pressure valve 12 is connected with a hydraulic oil tank 13; an oil inlet of the electromagnetic directional valve 4 is connected with an oil outlet of the hydraulic variable pump 1, the oil outlet is simultaneously connected with a pilot port of the hydraulic control directional valve 7 and an oil inlet of the one-way throttle valve 5, and an oil return port of the electromagnetic directional valve 4 is connected with an oil inlet of the delay valve 2; an oil inlet of the one-way throttle valve 5 is connected with an oil outlet of the electromagnetic reversing valve 4 and a pilot port of the hydraulic control reversing valve, and an oil outlet of the one-way throttle valve is connected with the energy accumulator 6; an oil inlet of the delay valve 2 is connected with an oil return port of the electromagnetic directional valve 4, and an oil outlet of the delay valve is connected with a hydraulic oil tank 13; an oil inlet of a hydraulic control reversing valve 7 is connected with an oil outlet of the hydraulic variable pump 1, a left oil outlet is connected with an oil port A of the motor 5, a right oil outlet is connected with an oil port B of the motor 5, a pilot port is simultaneously connected with an oil outlet of the electromagnetic reversing valve 4 and an oil inlet of the one-way throttle valve, and an oil return port is simultaneously connected with an oil inlet of an oil supplementing one-way valve 8, an oil inlet of an oil supplementing one-way valve 9, an oil outlet of an overflow valve 3 and an oil; an oil inlet of the oil supplementing one-way valve 8 is connected with an oil inlet of the oil returning back pressure valve 12, and an oil outlet is connected with an oil port A of the motor 5; an oil inlet of the oil supplementing one-way valve 9 is connected with an oil inlet of the oil returning back pressure valve 12, and an oil outlet is connected with an oil port B of the motor 5; an oil port A of the motor 5 is simultaneously connected with an oil outlet at the left side of the hydraulic control reversing valve and an oil outlet of the oil supplementing one-way valve 8, an oil port B of the motor 5 is simultaneously connected with an oil outlet at the right side of the hydraulic control reversing valve and an oil outlet of the oil supplementing one-way valve 9, and the shaft end of the motor 5 is mechanically connected with the fan 6.
The working principle of the invention is as follows: when the electromagnetic directional valve 4 is not electrified, the hydraulic variable pump 1 outputs hydraulic oil, the hydraulic oil enters the oil port A of the motor 10 through the hydraulic directional control valve 7 and drives the motor 10 and the fan 11 to rotate forwards, and the hydraulic oil output from the oil port B of the motor 10 flows back to the hydraulic oil tank 13 through the hydraulic directional control valve 7 and the oil return back pressure valve 12; when the heat dissipation system stops working, the hydraulic variable displacement pump 1 stops working, the motor 10 and the fan 11 continue to rotate by means of inertia, hydraulic oil output from an oil port B of the motor 10 returns through the oil return backpressure valve 4 to generate oil return backpressure, and when the oil inlet pressure of an oil port A of the motor 10 is lower than the oil return pressure of the oil port B, oil is supplemented to the oil port A of the motor 10 through the oil supplementing one-way valve 8 until the motor 10 and the fan 11 stop. When the electromagnetic directional valve 4 is electrified, hydraulic oil output by the hydraulic variable pump 1 pushes the hydraulic control directional valve 7 to change direction through the electromagnetic directional valve 4, meanwhile, the energy accumulator 6 is filled with liquid through the throttling hole of the one-way throttle valve 5, the hydraulic variable pump 1 enters the oil port B of the motor 10 through the hydraulic control directional valve 7 to drive the motor 10 and the fan 11 to rotate reversely, and the hydraulic oil output by the oil port A of the motor 10 flows back to the hydraulic oil tank 13 through the hydraulic control directional valve 7 and the oil return back pressure valve 12; when the heat dissipation system stops working, the electromagnetic directional valve 4 is powered off for reversing, hydraulic oil in the energy accumulator 6 slowly releases oil with certain pressure through the one-way valve of the one-way throttle valve 5, the electromagnetic directional valve 4 and the delay valve 2, the pressure can continuously keep the hydraulic control directional valve 7 in a reversing state for a period of time, so that the motor 10 and the fan 11 keep rotating in the same direction by means of inertia, and when the oil inlet pressure of an oil port B of the motor 10 is lower than the oil return pressure of an oil port A, oil is supplemented to the oil port B of the motor 10 through the oil supplementing one-way valve 9 until the motor 10 and the fan 11 stop. See figure 1 for details.
The invention also has the following features: the hydraulic variable pump can be replaced by a combination of a fixed displacement pump and a proportional overflow valve, and the reset time of the hydraulic control reversing valve can be controlled by changing the pre-charging pressure of the energy accumulator.
According to the motor reversing shutdown control method, on the premise that the existing control mode is not changed, the direction control of the motor is achieved through the combined use of the electromagnetic reversing valve and the hydraulic control reversing valve, the energy accumulator, the one-way throttle valve and the time delay valve hydraulic element are added in the control oil path, the pressure impact caused by the quick switching of the oil path is avoided through the delayed switching of the hydraulic control reversing valve, and the motor reversing shutdown process can be stopped gently. Meanwhile, an oil return back pressure valve is added, and an oil supplementing one-way valve is arranged behind the hydraulic control valve, so that the oil supplementing pressure is improved, the pressure loss during oil supplementing is reduced, and the motor is prevented from being sucked empty.
The embodiments of the present invention have been described in detail, but the embodiments are merely examples, and the present invention is not limited to the embodiments described above. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be covered by the present invention.
Claims (9)
1. An independent heat dissipation hydraulic system, characterized in that: the hydraulic control system comprises a hydraulic pump, a fan driving oil path and a delay control oil path which are connected in parallel;
the fan driving oil path comprises a hydraulic control reversing valve and a hydraulic motor which are sequentially connected with the hydraulic pump, the hydraulic control reversing valve is used for controlling the positive and negative rotation of the hydraulic motor, the fan driving oil path also comprises an overflow valve used for controlling the pressure of the independent heat dissipation hydraulic system, and the outlet of the overflow valve is connected to a hydraulic oil tank through a pipeline;
the delay control oil way comprises an electromagnetic directional valve and an energy accumulator which are sequentially connected with the hydraulic pump, the delay control oil way also comprises a delay valve, an oil inlet of the delay valve is connected with an oil return port of the electromagnetic directional valve through a pipeline, an oil outlet of the delay valve is connected with the hydraulic oil tank, and a working oil port of the electromagnetic directional valve is respectively connected with a pilot control oil port of the hydraulic directional valve and the energy accumulator through pipelines;
when the main oil way is communicated with the delay control oil way, oil in the main oil way flows through the pilot control oil port to push the valve core of the hydraulic control reversing valve to reverse, and meanwhile, the oil in the main oil way fills the accumulator;
when the main oil way and the delay control oil way are blocked, the accumulator releases the stored oil to act on the pilot control oil port so that the valve core of the hydraulic control reversing valve keeps a reversing state; when the oil in the energy accumulator stops releasing, the valve core of the hydraulic control reversing valve reverses and resets under the action of the spring force.
2. The self-contained, heat dissipating hydraulic system of claim 1 wherein the hydraulically controlled directional control valve is a two-position, four-way hydraulically controlled directional control valve or a three-position, four-way hydraulically controlled directional control valve.
3. The self-contained, heat dissipating hydraulic system of claim 2 wherein the hydraulically controlled reversing valve is a three-position, four-way hydraulically controlled reversing valve, the median function of which is H-shaped.
4. The independent heat dissipation hydraulic system of claim 1, wherein the hydraulic pump is a fixed displacement pump or a variable displacement pump.
5. The independent heat dissipation hydraulic system according to claim 1, further comprising a first oil-replenishing check valve and a second oil-replenishing check valve, wherein an outlet of the overflow valve is connected to two working oil ports of the hydraulic-control directional valve through pipelines, respectively, and the first oil-replenishing check valve and the second oil-replenishing check valve are connected to a pipeline between the outlet of the overflow valve and the two working oil ports of the hydraulic-control directional valve;
the oil outlet of the first oil supplementing one-way valve is connected with the first oil outlet of the hydraulic control reversing valve, and the oil outlet of the second oil supplementing one-way valve is connected with the second oil outlet of the hydraulic control reversing valve.
6. The independent heat-dissipating hydraulic system according to claim 1, wherein the delay control oil passage further includes a one-way throttle valve connected to a line between the electromagnetic directional valve and the accumulator.
7. The independent heat dissipation hydraulic system according to claim 1, further comprising an oil return back pressure valve, wherein an oil return line of the hydraulic control directional control valve and an oil return line of the overflow valve are merged and then return to the hydraulic oil tank through the oil return back pressure valve.
8. A working machine, characterized by comprising an independent heat dissipating hydraulic system as claimed in any one of claims 1 to 7.
9. The work machine of claim 8, wherein said work machine comprises a hydraulic excavator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922131110.2U CN211449237U (en) | 2019-12-03 | 2019-12-03 | Independent heat dissipation hydraulic system and engineering machinery provided with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922131110.2U CN211449237U (en) | 2019-12-03 | 2019-12-03 | Independent heat dissipation hydraulic system and engineering machinery provided with same |
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| Publication Number | Publication Date |
|---|---|
| CN211449237U true CN211449237U (en) | 2020-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922131110.2U Active CN211449237U (en) | 2019-12-03 | 2019-12-03 | Independent heat dissipation hydraulic system and engineering machinery provided with same |
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|---|---|
| CN (1) | CN211449237U (en) |
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- 2019-12-03 CN CN201922131110.2U patent/CN211449237U/en active Active
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