Energy-saving and life-prolonging pump control valve group

Abstract

The utility model discloses an energy-saving and life-prolonging pump control valve group, which relates to the technical field of hydraulic pumps and comprises a hydraulic pump, a first electromagnetic valve, a flow regulating valve and a second electromagnetic valve, a control execution unit is electrically connected with the hydraulic pump, a first overflow valve and the electromagnetic valves respectively, and an outlet of the hydraulic pump is communicated with the right ends of the electromagnetic valves. According to the energy-saving and life-prolonging pump control valve group, the situation that the standby displacement of a hydraulic pump is large is avoided, and hydraulic energy is saved; meanwhile, reciprocating motion of the piston in the maximum stroke is avoided, mechanical kinetic energy is saved, and the service life is prolonged; and the problem of heating of the shell is also avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic pumps, in particular to an energy-saving and life-extending pump control valve group. Background Art

[0002] There is a classic hydraulic system, as shown in the attached manual. Figure 2 , including a hydraulic pump 1, a relief valve 2, a solenoid valve 3, a control actuator unit 4, and an oil tank 5; when the solenoid valve 3 is energized, the control relief valve 2 establishes working pressure, and the control actuator unit 4 can work normally; when the solenoid valve 3 is not energized, the relief valve 2 releases pressure, the control actuator unit 4 does not work, and the hydraulic pump 1 is on standby.

[0003] During this process, hydraulic pump 1 has the following problems:

[0004] 1. When the hydraulic pump 1 is on standby, it runs at the maximum displacement. Although the relief valve 2 is in the pressure relief state, the system will still have a pressure of 3-10 Bar. This is to enable the hydraulic pump 1 to produce a good lubricating oil film when it is running to avoid rapid wear of the hydraulic pump. If the displacement of the hydraulic pump 1 is large, an overflow loss will be generated here, wasting hydraulic energy.

[0005] 2. Because the hydraulic pump 1 is running at the maximum displacement, its plunger reciprocates at the maximum stroke, which will cause mechanical kinetic energy loss and also affect the life of the hydraulic pump 1.

[0006] 3. Because the system pressure is very low, the leakage of hydraulic pump 1 will be very small, and the heat generated by the friction of hydraulic pump 1 itself cannot be taken away with the leaking oil, which will cause the temperature of the hydraulic pump housing to be high and affect the life of hydraulic pump 1. Utility Model Content

[0007] The utility model aims to solve the problems in the prior art and provides a pump control valve group which can save energy and prolong service life.

[0008] In order to achieve the above purpose, the utility model adopts the following technical scheme: an energy-saving and life-extending pump control valve group, including a hydraulic pump 1, a relief valve 2, a solenoid valve 3, a control execution unit 4, an oil tank 5, a variable oil cylinder 6, a flow regulating valve 7, a solenoid valve 8, a damping hole 9, and a relief valve 10.

[0009] The control execution unit 4 is electrically connected to the hydraulic pump 1 , the overflow valve 1 2 , and the solenoid valve 2 8 , respectively. The outlet of the hydraulic pump 1 is connected to the right end of the solenoid valve 2 8 .

[0010] When the control execution unit 4 is in working state, the solenoid valve 13 is energized, the relief valve 12 establishes working pressure, the solenoid valve 28 is not energized, and the rodless chamber of the variable cylinder 6 is connected to the oil tank 5 through the damping hole 9 and the right position of the solenoid valve 28. Therefore, the rodless chamber of the variable cylinder 6 has no pressure. Because the rod chamber of the variable cylinder 6 is connected to the outlet of the hydraulic pump 1, there is pressure. The piston rod of the variable cylinder 6 is at the rightmost end, and the hydraulic pump 1 is in the maximum displacement working state.

[0011] When the control execution unit 4 enters the standby state, the solenoid valve 13 is de-energized, and the pilot control oil of the relief valve 2 is connected to the inlet of the relief valve 2 10 through the right position of the solenoid valve 13. The relief valve 2 10 sets a low pressure, and the relief valve 2 establishes a standby low pressure; at the same time, the solenoid valve 28 is energized, and the rodless chamber of the variable oil cylinder 6 is connected to the outlet of the hydraulic pump 1 through the damping hole 9 and the left position of the solenoid valve 28. The rodless chamber of the variable oil cylinder 6 builds up pressure, while the force area of ​​the rod chamber is small and the spring force is small and can be ignored. Therefore, the piston rod of the variable oil cylinder 6 will move to the leftmost end, and the displacement of the hydraulic pump 1 will decrease to the minimum value. The minimum value is pre-set by the left end adjustment rod of the variable oil cylinder 6 to ensure that the output flow of the hydraulic pump 1 is lower than the set value of the flow control valve 7; at the same time, the flow control valve 7 will open and supply oil to the housing of the hydraulic pump 1 according to the set flow, and then it will be discharged from the drain pipe, effectively taking away the heat generated inside the hydraulic pump 1 to prevent the housing from overheating and extend the life of the hydraulic pump.

[0012] Furthermore, the standby low pressure established by the overflow valve 2 is set within 2 MPa.

[0013] Compared with the prior art, the advantages and positive effects of the utility model are:

[0014] 1. Energy saving: By dynamically adjusting the displacement of the hydraulic pump, the overflow loss of hydraulic energy is greatly reduced during standby;

[0015] 2. Reduce wear: avoid mechanical kinetic energy loss under large displacement, reduce plunger wear, and increase pump life;

[0016] 3. Efficient heat dissipation: The innovative cooling mechanism effectively solves the problem of shell overheating, further ensuring the long-term stable operation of the system;

[0017] In summary, the utility model avoids a large standby displacement of the hydraulic pump and saves hydraulic energy through a series of carefully designed control strategies and components working together; it also avoids the reciprocating motion of the piston at its maximum stroke, saves mechanical kinetic energy, and increases its service life; it also avoids the problem of housing heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the system principle of the utility model;

[0019] Figure 2 It is a schematic diagram of the system principle mentioned in the background technology;

[0020] Figure 3 The system schematic diagram of a variable displacement pump for power control.

[0021] Legend: 1. Hydraulic pump, 2. Overflow valve 1, 3. Solenoid valve 1, 4. Control actuator unit, 5. Oil tank, 6. Variable cylinder, 7. Flow control valve, 8. Solenoid valve 2, 9. Damping hole, 10. Overflow valve 2. DETAILED DESCRIPTION

[0022] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0024] like Figure 1 As shown, the utility model provides an energy-saving and life-extending pump control valve group, including a hydraulic pump 1, a relief valve 2, a solenoid valve 3, a control execution unit 4, an oil tank 5, a variable oil cylinder 6, a flow regulating valve 7, a solenoid valve 8, a damping hole 9, and a relief valve 10.

[0025] The control execution unit 4 is electrically connected to the hydraulic pump 1 , the overflow valve 1 2 , and the solenoid valve 2 8 , respectively. The outlet of the hydraulic pump 1 is connected to the right end of the solenoid valve 2 8 .

[0026] When the control execution unit 4 is in working state, the solenoid valve 13 is energized, the relief valve 12 establishes working pressure, the solenoid valve 28 is not energized, and the rodless chamber of the variable cylinder 6 is connected to the oil tank 5 through the damping hole 9 and the right position of the solenoid valve 28. Therefore, the rodless chamber of the variable cylinder 6 has no pressure. Because the rod chamber of the variable cylinder 6 is connected to the outlet of the hydraulic pump 1, there is pressure. The piston rod of the variable cylinder 6 is at the rightmost end, and the hydraulic pump 1 is in the maximum displacement working state.

[0027] When the control execution unit 4 enters the standby state, the solenoid valve 13 is de-energized, and the relief valve 12 pilot control oil is connected to the relief valve 10 inlet through the right position of the solenoid valve 13. The relief valve 10 sets a low pressure, and the relief valve 2 establishes a standby low pressure. The standby low pressure established by the relief valve 2 is set within 2MPa; this low pressure is the low pressure that can push the piston rod of the variable oil cylinder 6 to move normally; at the same time, the solenoid valve 28 is energized, because the right end of the solenoid valve 28 is connected to the outlet of the hydraulic pump 1, so after being energized, it will switch to the left position only after the outlet pressure of the hydraulic pump 1 drops to a certain value. This can avoid variable shock and the variable oil cylinder 6 The rodless chamber passes through the damping hole 9, and then is connected to the outlet of the hydraulic pump 1 through the left position of the solenoid valve 2 8. The rodless chamber of the variable cylinder 6 builds up pressure, while the force area of ​​the rod chamber is small, and the spring force is small and can be ignored. Therefore, the piston rod of the variable cylinder 6 will move to the leftmost end, and the displacement of the hydraulic pump 1 will decrease to the minimum value. The minimum value is pre-set by the adjusting rod at the left end of the variable cylinder 6 to ensure that the output flow of the hydraulic pump 1 is lower than the set value of the flow regulating valve 7; at the same time, the flow regulating valve 7 will open and supply oil to the housing of the hydraulic pump 1 according to the set flow, and then it will be discharged from the drain pipe, effectively taking away the heat generated inside the hydraulic pump 1, which is used to prevent the housing from overheating and extend the life of the hydraulic pump.

[0028] In the utility model, the hydraulic pump 1 is the core of the system and is responsible for providing hydraulic power. It is connected to the variable oil cylinder 6, and the displacement of the hydraulic pump is adjusted by the position change of the oil cylinder piston rod; the variable oil cylinder 6 adjusts the displacement of the hydraulic pump by the position change of its piston rod, and its rodless chamber and rod chamber are connected to the system through different paths respectively. Through the control of the solenoid valve 28 and the damping hole 9, the pressure in the oil cylinder can be changed, and then the position of the piston rod can be adjusted; the damping hole 9 is set in the oil path from the rodless chamber of the variable oil cylinder to the solenoid valve 28, and its function is to buffer and stabilize the flow of oil, ensure the smooth movement of the piston rod, and avoid the impact of sudden changes on the system; the solenoid valve 28 plays the role of switching the communication path of the variable oil cylinder 6 in the system. According to whether it is energized, it determines whether the rodless chamber of the variable oil cylinder is connected to the hydraulic pump outlet or the oil tank, and then adjusts the displacement of the hydraulic pump.

[0029] The overflow valve 2 is set at the outlet of the hydraulic pump to control the working pressure of the system. When the system does not need full pressure, the overflow valve conducts the oil back to the tank to avoid excessive pressure; the solenoid valve 3 is the key to controlling the overflow valve 2. When it is energized, the overflow valve builds up working pressure, and when it loses power, the overflow valve releases pressure, allowing the system to enter the standby state; the control actuator 4 works through hydraulic drive. When the solenoid valve 3 is energized, the actuator starts working, otherwise it stops working.

[0030] The oil tank 5 serves as the oil storage and return unit of the entire hydraulic system, and is connected to multiple locations such as the overflow valve and the rodless chamber of the variable oil cylinder to collect the refluxed hydraulic oil for system circulation.

[0031] The flow regulating valve 7 is installed in the circuit of the hydraulic pump housing. When the hydraulic pump enters the standby state, it opens and supplies oil to the hydraulic pump housing according to the set flow rate, and then discharges it through the drain pipe to achieve cooling of the hydraulic pump.

[0032] The overflow valve 10 is set to a lower pressure value. When the system enters the standby mode, the overflow valve 1 2 is connected to the overflow valve 10 through the right position of the solenoid valve 2 to establish a standby low-pressure environment to meet the needs of normal movement of the variable cylinder piston rod.

[0033] In summary, the utility model avoids the hydraulic pump 1 having a large standby displacement, thus saving hydraulic energy; it also avoids the piston from making a reciprocating motion at its maximum stroke, thus saving mechanical kinetic energy and increasing its lifespan; it also avoids the problem of housing heating.

[0034] The utility model is suitable for a hydraulic system which has a certain standby time during operation.

[0035] The protection scope of the utility model is a pump control unit composed of a hydraulic pump 1, a variable oil cylinder 6, a flow regulating valve 7, a solenoid valve 8 and a damping hole 9; wherein the function of the damping hole 9 is to ensure the moderate stability of the variable speed, and its existence is not absolutely necessary, so even if the damping hole 9 is cancelled, it is also within the protection scope.

[0036] In addition, the utility model is also applicable to variable pumps with power control, as shown in the following Figure 3 This is one of them. The utility model is also applicable to variable pumps with pressure control. They will not be explained one by one here. However, all pump control unit structures used fall within the protection scope.

[0037] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in other forms. Any technician familiar with the profession may use the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes and apply them to other fields. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A pump control valve group for energy saving and life extension, comprising a hydraulic pump (1), a relief valve (2), a solenoid valve (3), a control actuator (4), an oil tank (5), a variable oil cylinder (6), a flow regulating valve (7), a second solenoid valve (8), a damping hole (9), and a second relief valve (10), characterized in that: The control execution unit (4) is electrically connected to the hydraulic pump (1), the overflow valve 1 (2), and the solenoid valve 2 (8), respectively, and the outlet of the hydraulic pump (1) is connected to the right end of the solenoid valve 2 (8); When the control actuator unit (4) is in the working state, the solenoid valve 1 (3) is energized, the relief valve 1 (2) establishes working pressure, the solenoid valve 2 (8) is de-energized, the rodless chamber of the variable oil cylinder (6) is connected to the oil tank (5) through the damping hole (9) and then through the right position of the solenoid valve 2 (8), so the rodless chamber of the variable oil cylinder (6) is pressureless. Because the rod chamber of the variable oil cylinder (6) is connected to the outlet of the hydraulic pump (1), there is pressure. The piston rod of the variable oil cylinder (6) is at the rightmost end, and the hydraulic pump (1) is in the maximum displacement working state. When the control actuator unit (4) enters the standby state, the solenoid valve 1 (3) is de-energized, the pilot control oil of the relief valve 1 (2) is connected to the inlet of the relief valve 2 (10) through the right position of the solenoid valve 1 (3), and the relief valve 2 (10) is set to a low pressure. The flow valve 1 (2) establishes a standby low pressure; at the same time, the solenoid valve 2 (8) is energized, and the rodless chamber of the variable oil cylinder (6) is connected through the damping hole (9), and then through the left position of the solenoid valve 2 (8) and the outlet of the hydraulic pump (1). The rodless chamber of the variable oil cylinder (6) builds up pressure, while the force-bearing area of ​​the rod chamber is small, so the piston rod of the variable oil cylinder (6) will move to the leftmost end, and the displacement of the hydraulic pump (1) will be reduced to the minimum value. The minimum value is pre-set by the adjustment rod at the left end of the variable oil cylinder (6) to ensure that the output flow of the hydraulic pump (1) is lower than the set value of the flow control valve (7); at the same time, the flow control valve (7) will open and supply oil to the housing of the hydraulic pump (1) according to the set flow, and then discharge it through the drain pipe, effectively taking away the heat generated inside the hydraulic pump (1), so as to prevent the housing from overheating and extend the service life of the hydraulic pump.

2. The energy-saving and life-extending pump-controlled valve group according to claim 1 is characterized in that: The standby low pressure established by the relief valve 1 (2) is set within 2MPa.

3. The energy-saving and life-extending pump-controlled valve assembly according to claim 1, characterized in that: The hydraulic pump (1) is responsible for providing hydraulic power. The hydraulic pump (1) is connected to a variable oil cylinder (6), and the displacement of the hydraulic pump (1) is adjusted by changing the position of the oil cylinder piston rod.

4. The energy-saving and life-extending pump-controlled valve assembly according to claim 1 is characterized in that: The control execution unit (4) works by hydraulic drive. When the solenoid valve (3) is energized, the control execution unit (4) starts to work, otherwise it stops working.

5. The energy-saving and life-extending pump-controlled valve assembly according to claim 1 is characterized in that: The rodless chamber and the rod chamber of the variable oil cylinder (6) are connected to the system through different paths respectively, and the pressure in the oil cylinder is changed through the control of the second solenoid valve (8) and the damping hole (9), thereby adjusting the position of the piston rod.

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