Double-pump confluence automatic unloading oil way
By introducing components such as overflow cartridge valves and proportional overflow valves into the dual-pump confluence oil circuit, automatic unloading of the oil pump is achieved, solving the problem of high power consumption of motor-driven oil pumps during pressure holding operation, reducing equipment costs and improving energy efficiency.
Patent Information
- Application Number
- CN202520609169.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-01
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2035-04-01
AI Technical Summary
In a dual-pump confluence oil circuit, the motor-driven oil pump consumes a lot of power when the oil cylinder is in pressure holding action, requiring a larger power motor, which leads to high equipment cost and unnecessary energy consumption increase.
An automatic unloading oil circuit consisting of an overflow cartridge valve, a proportional overflow valve, a reversing valve, an oil pump, and a motor is used to achieve automatic unloading of the oil pump by controlling the oil flow path and pressure regulation, thereby reducing the power requirement of the motor.
This reduces the motor power requirement, lowers equipment costs, and improves energy efficiency, achieving energy savings during the hydraulic cylinder pressure-holding action.
Smart Images
Figure CN223854543U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to hydraulic cylinder technical field, concretely relates to a kind of automatic unloading oil way of double pump confluence. BACKGROUND
[0002] In most equipment, oil cylinder needs to be pressure-kept for a certain time after feeding or retracting movement, i.e. the pump output pressure needs to act on the oil cylinder for a period of time to meet the use requirements. In the double pump confluence oil way, the motor-driven oil pump consumes a lot of power when pressure-keeping the oil cylinder, so a motor with large power needs to be selected to ensure the normal operation of the oil cylinder pressure-keeping. However, during the feeding or retracting movement of the oil cylinder, the rapid movement caused by the double pump confluence acting on the oil cylinder does not require such a large power motor. SUMMARY
[0003] In view of the deficiencies of the prior art, the utility model aims to provide a kind of automatic unloading oil way of double pump confluence.
[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:
[0005] An automatic unloading oil way of double pump confluence includes an overflow-type cartridge valve, a proportional overflow valve, a reversing valve, an oil pump one, an oil pump two, an oil tank and a motor.
[0006] The working oil port A and the working oil port B of the reversing valve are connected to the rodless cavity and the rod cavity of the oil cylinder respectively, and the reversing valve rods on the left and right sides of the reversing valve are used to control the right or left movement of the spool in the reversing valve, thereby controlling the communication relationship between the working oil port A and the working oil port B of the reversing valve and the oil inlet and oil outlet of the reversing valve. The oil inlet of the reversing valve is connected to the oil pump one and the oil pump two.
[0007] The lower oil port of the overflow-type cartridge valve is connected to the oil pump one, the overflow port of the proportional overflow valve and the overflow port of the overflow-type cartridge valve are both connected to the oil tank, and the oil inlet of the proportional overflow valve and the upper oil port of the overflow-type cartridge valve are both connected to the oil pump two. The proportional overflow valve is electrically connected to the control computer for receiving the proportional current signal of the control computer.
[0008] The motor is used to synchronously provide driving force for the oil pump one and the oil pump two.
[0009] Further, a check valve is arranged on the oil path between the oil inlet of the reversing valve and the oil pump one, and the check valve is used to control the oil to flow only from the oil pump one to the oil inlet of the reversing valve.
[0010] Further, the automatic unloading oil circuit of the double-pump confluence further comprises an overflow cartridge valve II and an overflow valve; a lower oil port of the overflow cartridge valve II is connected to the oil pump II, an oil inlet of the overflow valve is connected to an upper oil port of the overflow cartridge valve II, and an overflow port of the overflow valve and an overflow port of the overflow cartridge valve II are both connected to the oil tank.
[0011] Further, the reversing valve is an O-shaped three-position four-way reversing electromagnetic valve.
[0012] The present application has the beneficial effect that: by using the present application, automatic unloading of the oil pump I can be realized in the double-pump confluence oil circuit during pressure maintaining operation, so that the power of the motor only needs to meet the needs of the oil pump II for oil cylinder feeding or retraction pressure maintaining operation, thereby a smaller power motor is adopted, which helps to reduce equipment cost and improve efficiency and save energy. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 FIG. 1 is a structural schematic diagram of an automatic unloading oil circuit of double-pump confluence in the embodiment of the present application. DETAILED DESCRIPTION
[0014] The present application will be further described below with reference to the accompanying drawings, and it should be noted that the present embodiment is based on the technical solution, and a detailed implementation and specific operation process are given, but the protection scope of the present application is not limited to the present embodiment.
[0015] The present embodiment provides an automatic unloading oil circuit of double-pump confluence, as shown in FIG. 1, which comprises an overflow cartridge valve I V1, a proportional overflow valve V2, a check valve V3, a reversing valve V4, an overflow cartridge valve II V5, an overflow valve V6, an oil pump I P1, an oil pump II P2, an oil tank and a motor M1. Figure 1
[0016] The working oil port A and the working oil port B of the reversing valve V4 are respectively connected to the rodless cavity and the rod cavity of the oil cylinder, the reversing valve rods YA2 and YA1 on the left and right sides of the reversing valve V4 are respectively used for controlling the right movement or the left movement of the spool in the reversing valve V4, so as to control the communication relationship between the working oil port A and the working oil port B of the reversing valve V4 and the oil inlet P and the oil discharge port T of the reversing valve V4; the oil inlet P of the reversing valve V4 is connected to the oil pump I P1 and the oil pump II P2.
[0017] The lower oil port of the overflow cartridge valve I V1 is connected to the oil pump I P1, the overflow port of the proportional overflow valve V2 and the overflow port of the overflow cartridge valve I V1 are both connected to the oil tank, the oil inlet of the proportional overflow valve V2 and the upper oil port of the overflow cartridge valve I V1 are both connected to the oil pump II P2; the proportional overflow valve V2 is electrically connected to the control computer, and is used for receiving the proportional current signal of the control computer.
[0018] The motor M1 is used to synchronize the driving force for the oil pump one P1 and the oil pump two P2.
[0019] In the embodiment, a one-way valve V3 is arranged on the oil path between the oil inlet P of the reversing valve V4 and the oil pump one P1, and the one-way valve V3 is used to control the oil to flow only from the oil pump one P1 to the oil inlet P of the reversing valve V4. The one-way valve V3 can prevent the pressure oil output by the oil pump two P2 from entering the oil pump one P1 and the lower oil port of the overflow cartridge valve one V1.
[0020] In the embodiment, the lower oil port of the overflow cartridge valve two V5 is connected to the oil pump two P2, the oil inlet of the overflow valve V6 is connected to the upper oil port of the overflow cartridge valve two V5, and the overflow port of the overflow valve V6 and the overflow port of the overflow cartridge valve two V5 are both connected to the oil tank. When the pressure output by the oil pump two P2 is greater than a safety value, the pressure generated at the lower oil port of the overflow cartridge valve two V5 causes the overflow cartridge valve two V5 to open, the pressure oil output by the oil pump two P2 enters from the lower oil port of the overflow cartridge valve two V5, and returns to the oil tank from the overflow port of the overflow cartridge valve two V5. When the pressure output by the oil pump two P2 exceeds a certain degree, the oil further enters the overflow valve V6 from the upper oil port of the overflow cartridge valve two V5 to make the overflow valve V6 conductive, and returns to the oil tank from the overflow port of the overflow valve V6. The overflow cartridge valve two V5 and the overflow valve V6 can control the maximum pressure of the main oil path, and play a safety role.
[0021] In the embodiment, the reversing valve V4 is an O-type three-position four-way reversing electromagnetic valve.
[0022] The working process of the automatic unloading oil path of the double-pump confluence is as follows:
[0023] According to the maximum pressure required when the oil cylinder makes a pressure maintaining action, the maximum power required for the motor M1 to drive the oil pump two P2 is calculated, and the type of the motor is determined.
[0024] According to the actual situation, the pressure of the oil cylinder when moving is determined (this pressure ensures that the oil cylinder can move the fastest when the double pumps confluence), and the required pressure value (this pressure value is the automatic unloading value of the overflow cartridge valve one V1 to the oil pump one P1) is input into the control computer. The pressure of the overflow valve V6 is adjusted so that the pressure in the oil path is equal to the pressure when the oil cylinder makes a pressure maintaining action when the overflow valve V6 works, so as to play a safety role.
[0025] The motor M1, the oil pump one P1 and the oil pump two P2 output pressure oil, when the reversing valve stem YA1 on the left side of the reversing valve V4 moves left under electricity, the oil inlet P and the working oil outlet A of the reversing valve V4 are communicated, the oil return T and the working oil outlet B are communicated. The pressure oil output by the oil pump one P1 and the pressure oil output by the oil pump two P2 are combined after the pressure oil output by the oil pump one P1 passes through the check valve V3, and then the combined pressure oil enters the rodless cavity of the oil cylinder through the oil inlet P and the working oil outlet A of the reversing valve V4, and the oil cylinder makes a fast feeding movement. When the oil cylinder feeding movement ends, the oil cylinder enters the pressure maintaining action, at this time, the pressure output by the oil pump two P2 increases, when the pressure continuously increases to the pressure value set by the control computer, the pressure oil output by the oil pump two P2 enters the proportional overflow valve V2 through the control oil way, so that the proportional overflow valve V2 is turned on, and the pressure oil output by the oil pump two P2 returns to the oil tank through the overflow port of the proportional overflow valve V2. At this time, the pressure of the lower oil port of the overflow type cartridge valve one V1 can overcome the pressure of the upper oil port, so that the overflow type cartridge valve one V1 is opened, the pressure oil output by the oil pump one P1 returns to the oil tank through the overflow port of the overflow type cartridge valve one V1, and automatic unloading is realized. At this time, the power of the motor M1 just meets the oil cylinder feeding pressure maintaining action of the oil pump two P2.
[0026] The motor M1, the oil pump one P1 and the oil pump two P2 output pressure oil, when the reversing valve stem YA1 on the left side of the reversing valve V4 moves left under electricity, the oil inlet P and the working oil outlet A of the reversing valve V4 are communicated, the oil return T and the working oil outlet B are communicated. The pressure oil output by the oil pump one P1 and the pressure oil output by the oil pump two P2 are combined after the pressure oil output by the oil pump one P1 passes through the check valve V3, and then the combined pressure oil enters the rodless cavity of the oil cylinder through the oil inlet P and the working oil outlet A of the reversing valve V4, and the oil cylinder makes a fast feeding movement. When the oil cylinder feeding movement ends, the oil cylinder enters the pressure maintaining action, at this time, the pressure output by the oil pump two P2 increases, when the pressure continuously increases to the pressure value set by the control computer, the pressure oil output by the oil pump two P2 enters the proportional overflow valve V2 through the control oil way, so that the proportional overflow valve V2 is turned on, and the pressure oil output by the oil pump two P2 returns to the oil tank through the overflow port of the proportional overflow valve V2. At this time, the pressure of the lower oil port of the overflow type cartridge valve one V1 can overcome the pressure of the upper oil port, so that the overflow type cartridge valve one V1 is opened, the pressure oil output by the oil pump one P1 returns to the oil tank through the overflow port of the overflow type cartridge valve one V1, and automatic unloading is realized. At this time, the power of the motor M1 just meets the oil cylinder feeding pressure maintaining action of the oil pump two P2.
[0027] Specifically, the overflow type cartridge valve one V1, the check valve V3 and the reversing valve V4 are not limited to large flow rate.
[0028] For those skilled in the art, various corresponding changes and modifications can be given according to the above technical solutions and concepts, and all these changes and modifications should be included in the protection scope of the utility model claim.
Claims
1. A dual pump combined flow automatic unloading oil passage characterized by comprising: The overflow cartridge valve one, the proportional overflow valve, the reversing valve, the oil pump one, the oil pump two, the oil tank and the motor are included. The working oil port A and the working oil port B of the reversing valve are connected to the rodless chamber and the rod chamber of the oil cylinder respectively, the reversing valve rods on the left and right sides of the reversing valve are used for controlling the right or left movement of the spool in the reversing valve, so as to control the communication relationship between the working oil port A and the working oil port B of the reversing valve and the inlet and outlet of the reversing valve; the inlet of the reversing valve is connected to the oil pump one and the oil pump two respectively. The lower oil port of the overflow cartridge valve one is connected to the oil pump one, the overflow port of the proportional overflow valve and the overflow port of the overflow cartridge valve one are connected to the oil tank, and the inlet of the proportional overflow valve and the upper oil port of the overflow cartridge valve one are connected to the oil pump two; the proportional overflow valve is electrically connected to the control computer and is used for receiving the proportional current signal of the control computer. The motor is used for synchronously providing driving force for the oil pump one and the oil pump two.
2. The dual pump merge automatic unloading oil passage according to claim 1, characterized by, A one-way valve is arranged on the oil path between the inlet of the reversing valve and the oil pump one, and the one-way valve is used for controlling the oil to flow only from the oil pump one to the inlet of the reversing valve.
3. The dual pump merge automatic unloading oil passage according to claim 1, characterized by, The overflow cartridge valve two and the overflow valve are further included; the lower oil port of the overflow cartridge valve two is connected to the oil pump two, the inlet of the overflow valve is connected to the upper oil port of the overflow cartridge valve two, and the overflow port of the overflow valve and the overflow port of the overflow cartridge valve two are connected to the oil tank.
4. The dual pump merge automatic unloading oil passage according to claim 1, characterized by, The reversing valve is an O-shaped three-position four-way reversing electromagnetic valve.