CN217502118U - Device for maintaining outlet pressure of electric control heavy-load open pump - Google Patents
Device for maintaining outlet pressure of electric control heavy-load open pump Download PDFInfo
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- CN217502118U CN217502118U CN202221631676.7U CN202221631676U CN217502118U CN 217502118 U CN217502118 U CN 217502118U CN 202221631676 U CN202221631676 U CN 202221631676U CN 217502118 U CN217502118 U CN 217502118U
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Abstract
The utility model provides a maintain open pump export pressure device of automatically controlled heavy load, including oil inlet P, oil-out P1, oil return T, two-way cartridge valve, switching-over valve and leading overflow valve, oil inlet P communicates with the oil-out of electric-hydraulic proportional variable pump, and the oil inlet of two-way cartridge valve links to each other with oil inlet P, and the control port of two-way cartridge valve passes through the switching-over valve and links to each other with oil inlet P or oil return T, and the oil inlet of leading overflow valve links to each other with oil inlet P, and the oil-out of leading overflow valve passes through the switching-over valve and advances the oil outlet and link to each otherThe oil port P or the oil return port T is connected. The beneficial effects of the utility model are that owing to adopt above-mentioned technical scheme, can keep oil inlet P department to have P S The electro-hydraulic proportional variable pump can respond quickly and adjust the discharge capacity of the electro-hydraulic proportional variable pump, and has the advantages of low power consumption, low failure rate and easiness in design and equipment.
Description
Technical Field
The utility model relates to a hydraulic equipment technical field, specific is a device of maintaining automatically controlled heavy load open pump export pressure.
Background
The water pumps applied to the fire fighting, emergency rescue and disaster relief equipment generally have the requirements of large flow, high water pressure and long continuous working time, and the conventional motor driving mode is difficult to meet the requirements, so that the water pumps applied to the fire fighting, emergency rescue and disaster relief equipment are mostly driven by hydraulic motors. The hydraulic pump outputs hydraulic oil which is supplied to the hydraulic motor through the oil path, so that the hydraulic motor drives the water pump to rotate. In the working process of the system, flow control can be involved, and the flow control mode comprises two modes, one mode is to arrange a relevant valve group, such as a throttle valve and the like, on an oil path to adjust the power of a hydraulic motor, but the control mode of the valve group has the problem of power waste. The other flow control mode is to adopt a pump control system to control the output pressure and flow of the hydraulic pump so as to achieve the effect of regulating the power of the hydraulic motor.
The water pump in the equipment such as fire control except having the requirement in the aspect of flow and water pressure, does not idle at ordinary times, and the basic requirement of water pump in equipment such as fire control is also to ability quick response when using, and the water pump provides the motive power by hydraulic motor, and among the pump control system, the quick start and the discharge capacity of hydraulic pump change, directly decided whether the water pump can realize the use needs fast.
One common way in existing pump control systems is to use an electro-hydraulic proportional variable pump, i.e., a proportional solenoid valve is used to adjust the displacement of the electro-hydraulic proportional variable pump. One premise of the pump control system for realizing quick response is to provide a control pressure P for the electro-hydraulic proportional variable pump S . When the control pressure is less than P S When the control pressure is greater than or equal to P, the initial position of the electro-hydraulic proportional variable pump is Vg max S In the process, the initial position of the electro-hydraulic proportional variable pump is Vg min, and in order to move the initial position of the electro-hydraulic proportional variable pump from Vg max to Vg min and ensure the normal operation of the electro-hydraulic proportional variable pump, a P value is required to be maintained S Control ofAnd (4) pressure. The oil pressure control can be realized in two ways, namely, the pressure of the oil inlet P is kept to be greater than P S The other mode is that a control port E of the electro-hydraulic proportional variable pump is connected with a position larger than P S The control oil of (1). In some prior art, a gear pump is provided at the outlet of the pump to provide a pressure greater than P S The control oil is connected to the control port E, but the gear pump is limited in its arrangement to a large extent due to installation space, piping arrangement, and engine power.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a maintain open pump outlet pressure device of automatically controlled heavy load, set up it in the exit of electric liquid proportion variable pump, the exit that makes electric liquid proportion variable pump can keep a invariable and less control pressure, when the water pump is out of work, electric liquid proportion variable pump only exports with the little flow of control pressure, hydraulic system does not have the flow output, at the water pump during operation, hydraulic system can quick response, carry out high pressure large-traffic and output of disaster relief, especially, be fit for using on equipment such as fire control, speedily carry out rescue work, relief work.
The technical scheme of the utility model is that:
the utility model provides a maintain automatically controlled heavy load open pump export pressure device which characterized in that: the hydraulic control system comprises an oil inlet P, an oil outlet P1, an oil return port T, a two-way cartridge valve, a reversing valve and a front overflow valve, wherein the oil inlet P is communicated with the oil outlet of the electro-hydraulic proportional variable pump, the oil inlet of the two-way cartridge valve is connected with the oil inlet P, the control port of the two-way cartridge valve is connected with the oil inlet P or the oil return port T through the reversing valve, the oil inlet of the front overflow valve is connected with the oil inlet P, the oil outlet of the front overflow valve is connected with the oil inlet P or the oil return port T through the reversing valve, and the oil outlet of the two-way cartridge valve supplies oil to a main oil way through a P1 port and is used for driving a hydraulic execution element.
Specifically, the reversing valve is an electromagnetic control two-position four-way reversing valve, when a valve core of the reversing valve is located at a first position, a control port of the two-way cartridge valve is connected with the oil inlet P, and an oil outlet of the front overflow valve is connected with the oil return port T. When the valve core of the reversing valve is located at the second position, the control port of the two-way cartridge valve is connected with the oil return port T, and the oil outlet of the front overflow valve is connected with the oil inlet P.
When the execution element does not need to supply oil, the electro-hydraulic proportional variable pump is started, a positive pressure is generated at the position of an oil inlet P, the pressure is communicated with a control port of the two-way cartridge valve, the pressure and the elasticity of a spring in the two-way cartridge valve are greater than the pressure of the oil inlet of the two-way cartridge valve, the two-way cartridge valve is in a disconnected state, no hydraulic oil exists at the oil outlet of the two-way cartridge valve, and the hydraulic oil pumped out by the electro-hydraulic proportional variable pump can only flow back to an oil return port T through a front overflow valve. Setting the pressure of the front overflow valve to be P S So that the electro-hydraulic proportional variable pump can be driven by P S Small flow output, so that the oil inlet P can be kept at P S The pressure of the pump enables the displacement change of the electro-hydraulic proportional variable pump to be quickly responded.
When the actuator needs oil supply, the valve core of the control reversing valve moves to the second position. The oil inlet and the oil return port of the front overflow valve are both communicated with the oil inlet P, the front overflow valve keeps a disconnected state, and hydraulic oil pumped out by the electro-hydraulic proportional variable pump can only flow to the two-way cartridge valve. The control port of the two-way cartridge valve is connected with the oil return port T, the two-way cartridge valve can be in a conducting state as long as the elastic force of a spring in the two-way cartridge valve is smaller than the pressure of the oil inlet P, and hydraulic oil pumped by the electro-hydraulic proportional variable pump flows out of the oil outlet of the two-way cartridge valve and is supplied to an execution element through a main oil way.
The utility model discloses can be when the executive component does not need the fuel feeding to low-power consumption keeps oil inlet P department to have P S The electro-hydraulic proportional variable pump can respond quickly and adjust the discharge capacity of the electro-hydraulic proportional variable pump. The utility model discloses can keep that electricity liquid proportion variable displacement pump self is inside to be in the state that has oil all the time, lubricate it self. The utility model discloses also remove the use of gear pump from, greatly reduced the consumption to engine power, reduced the degree of difficulty of design and assembly.
Preferably, a throttle valve is arranged on an oil path between the oil inlet P and the reversing valve.
And a pressure-limiting oil way is arranged between the electro-hydraulic proportional variable pump and the oil return port T, and a main overflow valve is arranged on the pressure-limiting oil way.
The main overflow valve limits the oil pressure output by the electro-hydraulic proportional variable pump, and prevents the pipeline and the execution element from being damaged by overpressure.
Preferably, a one-way valve is arranged between the oil outlet and the oil return port T of the two-way cartridge valve.
The one-way valve prevents the generation of a suction phenomenon and reduces the failure rate of the electro-hydraulic proportional variable pump.
The utility model has the advantages and positive effects that: due to the adoption of the technical scheme, P at the position of the oil inlet P can be kept S The electro-hydraulic proportional variable pump can respond quickly and adjust the discharge capacity of the electro-hydraulic proportional variable pump, and has the advantages of low power consumption, low failure rate and easiness in design and equipment.
Drawings
FIG. 1 is a schematic view of the structure principle of the present invention
In the figure:
1. two-way cartridge valve 2, reversing valve 3 and front overflow valve
4. Throttle valve 5, main overflow valve 6 and one-way valve
Detailed Description
As shown in fig. 1, the utility model discloses:
the utility model provides a maintain automatically controlled heavy load open pump outlet pressure device, including oil inlet P, oil-out P1, oil return T, two-way cartridge valve 1, switching-over valve 2 and leading overflow valve 3, oil inlet P communicates with the oil-out of electric-hydraulic proportional variable pump, the oil inlet of two-way cartridge valve links to each other with oil inlet P, the control port of two-way cartridge valve passes through the switching-over valve and links to each other with oil inlet P or oil return T, the oil inlet of leading overflow valve links to each other with oil inlet P or oil return T, oil return T links to each other the oil tank, the oil-out of two-way cartridge valve 1 supplies oil to hydraulic pressure main oil circuit through oil-out P1, be used for driving hydraulic pressure executive component, hydraulic motor drive water pump rotates.
Specifically, the reversing valve 2 is an electromagnetic control two-position four-way reversing valve, when a valve core of the reversing valve is located at a first position, a control port of the two-way cartridge valve 1 is connected with an oil outlet of the electro-hydraulic proportional variable pump 1, and an oil return port of the front overflow valve 3 is connected with an oil return port T. When the valve core of the reversing valve is located at the second position, the control port of the two-way cartridge valve 1 is connected with the oil return port T, and the oil return port of the front overflow valve 3 is connected with the oil outlet of the electro-hydraulic proportional variable pump 1.
The utility model discloses can be when the executive component does not need the fuel feeding to low-power consumption keeps oil inlet P department to have P S The electro-hydraulic proportional variable pump 1 can respond quickly by the oil pressure, and the displacement of the electro-hydraulic proportional variable pump 1 is adjusted. The utility model discloses can keep the inside state that is in all the time of having oil of electricity liquid proportion variable pump self, lubricate it self. The utility model discloses also remove the use of gear pump from, greatly reduced the consumption to engine power, reduced the degree of difficulty of design and assembly.
Preferably, a throttle valve 4 is arranged on an oil path between the oil inlet P and the reversing valve 2.
And a pressure-limiting oil way is arranged between the oil inlet P and the oil return port T, and a main overflow valve 5 is arranged on the pressure-limiting oil way.
The main overflow valve 5 limits the oil pressure output by the electro-hydraulic proportional variable pump, and prevents the pipeline and the execution element from being damaged by overpressure.
And a one-way valve 6 is arranged between the oil outlet and the oil return port T of the two-way cartridge valve.
The one-way valve prevents the generation of a suction phenomenon and reduces the failure rate of the electro-hydraulic proportional variable pump.
The working process of the example is as follows:
when an execution element does not need to supply oil, a valve core of the reversing valve 2 is located at a first position, the electro-hydraulic proportional variable pump is started, a positive pressure is generated at an oil inlet P, the pressure is communicated with a control port of the two-way cartridge valve, the pressure and the elasticity of a spring in the two-way cartridge valve 1 are greater than the pressure of an oil inlet of the two-way cartridge valve 1, the two-way cartridge valve 1 is in a disconnected state, no hydraulic oil is output at an oil outlet of the two-way cartridge valve 1, and the hydraulic oil pumped out by the electro-hydraulic proportional variable pump 1 can only flow back to an oil return port T through the front overflow valve 3. The pressure of the front overflow valve 3 is set to P S So that the electro-hydraulic proportional variable pump can be driven to generate pressure P S Small flow output to keep the P at the oil inlet S The pressure of the pump can be adjusted, so that the displacement change of the electro-hydraulic proportional variable pump can be quickly responded.
When the actuator needs oil supply, the valve core of the control reversing valve 2 moves to the second position. The oil inlet and the oil return port of the front overflow valve 3 are both communicated with the oil inlet P, the front overflow valve 3 keeps a disconnected state, and hydraulic oil pumped out by the electro-hydraulic proportional variable pump can only flow to the two-way cartridge valve 1. The control port of the two-way cartridge valve 1 is connected with the oil return port T, the two-way cartridge valve 1 can be in a conduction state as long as the elastic force of a spring in the two-way cartridge valve is smaller than the pressure of an oil outlet of the electro-hydraulic proportional variable pump 1, hydraulic oil pumped by the electro-hydraulic proportional variable pump 1 flows out of the oil outlet P1, and the hydraulic oil is supplied to an execution element through a main oil way.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention, and should not be considered as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.
Claims (6)
1. The utility model provides a maintain automatically controlled heavy load open pump export pressure device which characterized in that: the hydraulic control system comprises an oil inlet P, an oil outlet P1, an oil return port T, a two-way cartridge valve, a reversing valve and a front overflow valve, wherein the oil inlet P is communicated with the oil outlet of the electro-hydraulic proportional variable pump, the oil inlet of the two-way cartridge valve is connected with the oil inlet P, the control port of the two-way cartridge valve is connected with the oil inlet P or the oil return port T through the reversing valve, the oil inlet of the front overflow valve is connected with the oil inlet P, and the oil outlet of the front overflow valve is connected with the oil inlet P or the oil return port T through the reversing valve.
2. A device for maintaining an electrically controlled heavy duty open pump outlet pressure as claimed in claim 1, wherein: the reversing valve is a two-position four-way reversing valve, when a valve core of the reversing valve is positioned at a first position, a control port of the two-way cartridge valve is connected with the oil inlet P, and an oil outlet of the front overflow valve is connected with the oil return port T; when the valve core of the reversing valve is located at the second position, the control port of the two-way cartridge valve is connected with the oil return port T, and the oil outlet of the front overflow valve is connected with the oil inlet P.
3. A device for maintaining an electrically controlled heavy duty open pump outlet pressure as claimed in claim 1, wherein: the reversing valve is an electromagnetic valve.
4. The apparatus for maintaining an electrically controlled heavy duty open pump outlet pressure according to claim 1, wherein: and a throttle valve is arranged on an oil path between the oil inlet P and the reversing valve.
5. A device for maintaining an electrically controlled heavy duty open pump outlet pressure as claimed in claim 1, wherein: and a pressure-limiting oil way is arranged between the electro-hydraulic proportional variable pump and the oil return port T, and a main overflow valve is arranged on the pressure-limiting oil way.
6. A device for maintaining an electrically controlled heavy duty open pump outlet pressure as claimed in claim 1, wherein: and a one-way valve is arranged between the oil outlet and the oil return port T of the two-way cartridge valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221631676.7U CN217502118U (en) | 2022-06-28 | 2022-06-28 | Device for maintaining outlet pressure of electric control heavy-load open pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221631676.7U CN217502118U (en) | 2022-06-28 | 2022-06-28 | Device for maintaining outlet pressure of electric control heavy-load open pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217502118U true CN217502118U (en) | 2022-09-27 |
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ID=83341788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221631676.7U Active CN217502118U (en) | 2022-06-28 | 2022-06-28 | Device for maintaining outlet pressure of electric control heavy-load open pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217502118U (en) |
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2022
- 2022-06-28 CN CN202221631676.7U patent/CN217502118U/en active Active
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