Energy-saving hydraulic liquid supply system

Abstract

The utility model provides an energy -conserving hydraulic liquid supply system, include: hydraulic pump, the oil inlet of hydraulic pump communicates with oil supply tank, high pressure filter, the oil inlet of high pressure filter communicates with the oil inlet of hydraulic pump, electromagnetic overflow valve, the oil inlet of electromagnetic overflow valve communicates with the oil outlet of high pressure filter, and the overflow port of electromagnetic overflow valve communicates with the oil return tank, first pressure sensor, the oil outlet of high pressure filter communicates with oil supply pipe through the connecting pipe, and first pressure sensor is used for gathering the pressure in the connecting pipe, servo motor is used for driving hydraulic pump operation. The utility model has the advantages that: realize energy -conserving through the control servo motor's speed, according to the pressure feedback of first pressure sensor to control servo motor's speed realizes pressure stability, and the oil distribution disc inclination of pump group has no change in the adjustment process, reduces the pressure impact, and because the motor speed is very low in the low energy consumption, the current will also be small along with it, so as to realize energy -conserving and emission reduction, reduce operating cost.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic fluid supply technology, and in particular relates to an energy-saving hydraulic fluid supply system. Background Technology

[0002] The steel production process requires a large number of hydraulic equipment. Depending on the working conditions and process requirements, these hydraulic equipment can be applied to various aspects of the hydraulic system. Some systems require high pressure and large flow, and the intermittent working mode will cause frequent start-stop of the motor, which will cause a large pressure shock and affect the service life of the hydraulic system. Therefore, it must be run for a long time. However, this will cause ineffective energy loss. Therefore, under the premise of meeting normal operation, the ineffective energy loss should be minimized. The traditional fluid supply system achieves this by changing the swashplate tilt angle in the high-pressure pump set. When frequent operation is required, the swashplate tilt angle is at its maximum, and the pump set outputs full displacement until the operation is completed. When no operation is required, it only replenishes the lost energy. At this time, the swashplate tilt angle is 0 degrees, the pump set displacement is at its minimum, and the pump set output power is at its minimum. In this way, the motor does a lot of ineffective work, which increases the operating cost of the system. Utility Model Content

[0003] In view of this, the present invention aims to provide an energy-saving hydraulic fluid supply system in order to solve at least one of the above-mentioned technical problems.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0005] An energy-saving hydraulic fluid supply system, comprising:

[0006] A hydraulic pump, wherein the oil inlet of the hydraulic pump is connected to the oil supply tank;

[0007] A high-pressure filter, wherein the oil inlet of the high-pressure filter is connected to the oil inlet of the hydraulic pump;

[0008] An electromagnetic overflow valve, wherein the oil inlet of the electromagnetic overflow valve is connected to the oil outlet of the high-pressure filter, and the overflow port of the electromagnetic overflow valve is connected to the return oil tank.

[0009] The first pressure sensor is used to collect the pressure inside the connecting pipe. The oil outlet of the high-pressure filter is connected to the oil supply pipe through a connecting pipe.

[0010] A servo motor is used to drive the hydraulic pump.

[0011] Furthermore, the connecting pipe is equipped with a one-way valve, the oil inlet of which is connected to the oil outlet of the high-pressure filter, and the one-way valve is located between the first pressure sensor and the oil outlet of the high-pressure filter.

[0012] Furthermore, a pressure gauge is provided on the connecting pipe, and the pressure gauge is connected to the pressure testing connector on the connecting pipe through a measuring hose. The pressure testing connector is located between the oil outlet of the high-pressure filter and the oil inlet of the one-way valve.

[0013] Furthermore, the oil outlet of the hydraulic pump is connected to the oil inlet of the high-pressure filter via a hose.

[0014] Furthermore, the overflow port of the hydraulic pump is connected to the return oil tank via a hose.

[0015] Furthermore, there are multiple hydraulic pumps, and each hydraulic pump is equipped with a high-pressure filter, an electromagnetic relief valve, a check valve, and a servo motor.

[0016] The connecting pipes of multiple high-pressure filters are connected to the oil supply pipe.

[0017] Furthermore, a high-pressure ball valve is provided on the oil supply pipe;

[0018] The oil supply pipe is equipped with an accumulator, and the charging and discharging port of the accumulator is connected to the oil supply pipe. The charging and discharging port of the accumulator is located between the high-pressure ball valve and the connecting pipe.

[0019] Furthermore, it also includes:

[0020] The first overflow valve has its inlet connected to the oil supply pipe and its overflow port connected to the return oil tank. The inlet of the first overflow valve is located between the charging and discharging port of the accumulator and the high-pressure ball valve.

[0021] The second pressure sensor has its measuring port located between the oil inlet of the first relief valve and the high-pressure ball valve.

[0022] Furthermore, the oil inlet of the first overflow valve is connected to the oil inlet of the two-position four-way directional valve, the oil return port of the two-position four-way directional valve is connected to the oil return tank, the second oil outlet of the two-position four-way directional valve is connected to the oil inlet of the first overflow valve, and the first oil outlet of the two-position four-way directional valve is connected to the oil return tank.

[0023] Furthermore, the oil inlet of the first overflow valve is connected to the oil inlet of the two-position four-way directional valve through a throttle valve.

[0024] The second oil outlet of the two-position four-way directional valve is connected to the oil inlet of the first overflow valve through a throttle valve.

[0025] The orifice diameter of a two-position four-way directional valve is smaller than that of a solenoid relief valve.

[0026] Compared with the prior art, the energy-saving hydraulic fluid supply system of this utility model has the following beneficial effects:

[0027] The energy-saving hydraulic fluid supply system described in this utility model achieves energy saving by controlling the speed of the servo motor. The speed of the servo motor is controlled based on the pressure feedback from the first pressure sensor to achieve pressure stability. During the adjustment process, the tilt angle of the pump group's oil distribution plate remains unchanged, reducing pressure shock. Furthermore, since the motor speed is very low when energy consumption is low, the current will also decrease accordingly, thereby achieving energy saving, emission reduction, and lower operating costs. Attached Figure Description

[0028] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0029] Figure 1 This is a schematic diagram of the connection structure of the energy-saving hydraulic fluid supply system according to an embodiment of the present utility model;

[0030] Figure 2 As described in the embodiments of this utility model Figure 1 Schematic diagram of the structure at point A in the middle.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Hydraulic pump; 2. Servo motor; 3. Oil supply tank; 4. Oil return tank; 5. High-pressure filter; 6. Solenoid relief valve; 7. Pressure gauge; 8. Check valve; 9. First pressure sensor; 10. Second pressure sensor; 11. High-pressure ball valve; 12. Oil supply pipe; 13. Accumulator; 14. First relief valve; 15. Two-position four-way directional valve; 16. Throttle valve. Detailed Implementation

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0034] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] like Figures 1 to 2 As shown, an energy-saving hydraulic fluid supply system includes:

[0038] Hydraulic pump 1, the oil inlet of hydraulic pump 1 is connected to oil supply tank 3;

[0039] High-pressure filter 5, the oil inlet of high-pressure filter 5 is connected to the oil inlet of hydraulic pump 1;

[0040] The electromagnetic overflow valve 6 has its inlet connected to the outlet of the high-pressure filter 5, and its overflow port connected to the return oil tank 4.

[0041] The first pressure sensor 9 is used to collect the pressure inside the connecting pipe. The oil outlet of the high-pressure filter 5 is connected to the oil supply pipe 12 through a connecting pipe.

[0042] Servo motor 2 is used to drive hydraulic pump 1.

[0043] A one-way valve 8 is provided on the connecting pipe. The oil inlet of the one-way valve 8 is connected to the oil outlet of the high-pressure filter 5. The one-way valve 8 is located between the first pressure sensor 9 and the oil outlet of the high-pressure filter 5.

[0044] A pressure gauge is installed on the connecting pipe. The pressure gauge is connected to the pressure testing connector on the connecting pipe through a measuring hose. The pressure testing connector is located between the oil outlet of the high-pressure filter 5 and the oil inlet of the one-way valve 8.

[0045] The outlet of hydraulic pump 1 is connected to the inlet of high-pressure filter 5 via a hose.

[0046] The overflow port of hydraulic pump 1 is connected to the return oil tank 4 via a hose.

[0047] Energy saving is achieved by setting a first pressure sensor 9 and a servo motor 2 and controlling the speed of the servo motor 2. During normal operation, the speed of the servo motor 2 is the rated speed, at which time the pump set outputs full displacement. When it is necessary to maintain pressure and position, the speed of the servo motor 2 is the minimum speed for the long service life of the pump set (or the pump set is stopped) (multiple hydraulic pumps 1 connected in parallel can be connected through an accumulator 13). At this time, the output power of the pump set is reduced to the minimum, and the pressure feedback from the first pressure sensor 9 is used to control the speed of the servo motor 2 to achieve pressure stability. Since the tilt angle of the pump set's distribution plate does not change, there is no pressure shock. In addition, since the motor speed is very low when energy consumption is low, the current will also be small, thereby achieving energy saving, emission reduction, and reduced operating costs.

[0048] In other embodiments, there are multiple hydraulic pumps 1, and each hydraulic pump 1 is equipped with a high-pressure filter 5, an electromagnetic relief valve 6, a one-way valve 8, and a servo motor 2; the connecting pipes of the multiple high-pressure filters 5 are connected to the oil supply pipe 12.

[0049] A high-pressure ball valve 11 is provided on the oil supply pipe 12; an accumulator 13 is provided on the oil supply pipe 12, and the charging and discharging port of the accumulator 13 is connected to the oil supply pipe 12. The charging and discharging port of the accumulator 13 is located between the high-pressure ball valve 11 and the connecting pipe.

[0050] Hydraulic pump 1 supplies oil to accumulator 13. When the oil pressure in accumulator 13 reaches the set pressure, high-pressure oil is no longer supplied to accumulator 13. At this time, accumulator 13 maintains the oil supply to oil supply pipe 12. Second pressure sensor 10 monitors the oil pressure in oil supply pipe 12 at all times. When second pressure sensor 10 detects that accumulator 13 is lower than about 85-90% of the set pressure, hydraulic pump 1 resumes supplying oil to accumulator 13. Taking advantage of the fact that accumulator 13 can be filled quickly and replenished in time, the amount of oil supplied by the oil supply equipment can be reduced, thus achieving energy saving effect.

[0051] The energy-saving hydraulic supply system also includes: a first relief valve 14, whose inlet is connected to the oil supply pipe 12 and whose overflow port is connected to the return oil tank 4, with the inlet of the first relief valve 14 located between the charging / discharging port of the accumulator 13 and the high-pressure ball valve 11; and a second pressure sensor 10, whose measuring port is located between the inlet of the first relief valve 14 and the high-pressure ball valve 11. The first relief valve 14 is used to stabilize the pressure in the oil supply pipe 12 under parallel operation, improving the stability of the system.

[0052] The oil inlet of the first relief valve 14 is connected to the oil inlet (P port) of the two-position four-way directional valve 15, the oil return port (T port) of the two-position four-way directional valve 15 is connected to the oil return tank 4, the second oil outlet (A port) of the two-position four-way directional valve 15 is connected to the oil inlet of the first relief valve 14, and the first oil outlet (B port) of the two-position four-way directional valve 15 is connected to the oil return tank 4.

[0053] When the two-position four-way solenoid valve is in the first state, the P port and B port of the valve body are connected, and the T port and A port of the valve body are connected. When the oil pressure in the oil supply pipe 12 is too high, part of the high-pressure oil passes through the first overflow valve 14, part of the high-pressure oil flows into the P port and B port and enters the return oil tank 4, and part of the high-pressure oil from the second pressure stabilizing oil circuit enters the return oil tank 4T through the A port and T port of the valve body, thus achieving pressure stabilization.

[0054] When the two-position four-way solenoid valve is in the first state, the P port and A port of the valve body are connected, the T port and B port of the valve body are connected, and the two-position four-way solenoid valve is in the closed state.

[0055] The inlet of the first relief valve 14 is connected to the inlet of the two-position four-way directional valve 15 through the throttle valve 16; the second outlet of the two-position four-way directional valve 15 is connected to the inlet of the first relief valve 14 through the throttle valve 16; the diameter of the two-position four-way directional valve 15 is smaller than the diameter of the solenoid relief valve 6, and the diameter of the throttle valve 16 is the same as the diameter of the two-position four-way directional valve 15. By setting the throttle valve 16, the two-position four-way directional valve 15 can be prevented from being damaged due to high pressure, thereby improving the reliability of the hydraulic system.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

[0057] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An energy-saving hydraulic fluid supply system, characterized in that, include: Hydraulic pump (1), the oil inlet of which is connected to oil supply tank (3); High pressure filter (5), the oil inlet of the high pressure filter (5) is connected to the oil inlet of the hydraulic pump (1); The electromagnetic overflow valve (6) has its inlet connected to the outlet of the high-pressure filter (5) and its overflow port connected to the return oil tank (4). The first pressure sensor (9) is connected to the oil supply pipe (12) through the oil outlet of the high pressure filter (5) via a connecting pipe. The first pressure sensor (9) is used to collect the pressure in the connecting pipe. Servo motor (2) is used to drive the hydraulic pump (1) to operate.

2. The energy-saving hydraulic fluid supply system according to claim 1, characterized in that: The connecting pipe is equipped with a one-way valve (8), the oil inlet of the one-way valve (8) is connected to the oil outlet of the high pressure filter (5), and the one-way valve (8) is located between the first pressure sensor (9) and the oil outlet of the high pressure filter (5).

3. The energy-saving hydraulic fluid supply system according to claim 1, characterized in that: The connecting pipe is equipped with a pressure gauge, which is connected to the pressure testing connector on the connecting pipe through a measuring hose. The pressure testing connector is located between the oil outlet of the high-pressure filter (5) and the oil inlet of the one-way valve (8).

4. The energy-saving hydraulic fluid supply system according to claim 1, characterized in that: The outlet of the hydraulic pump (1) is connected to the inlet of the high-pressure filter (5) via a hose.

5. The energy-saving hydraulic fluid supply system according to claim 1, characterized in that: The overflow port of the hydraulic pump (1) is connected to the return oil tank (4) via a hose.

6. The energy-saving hydraulic fluid supply system according to claim 1, characterized in that: The number of hydraulic pumps (1) is multiple, and each hydraulic pump (1) is provided with a high-pressure filter (5), an electromagnetic relief valve (6), a check valve (8), and a servo motor (2); The connecting pipes of multiple high-pressure filters (5) are connected to the oil supply pipe (12).

7. The energy-saving hydraulic fluid supply system according to claim 6, characterized in that: A high-pressure ball valve (11) is provided on the oil supply pipe (12); The oil supply pipe (12) is equipped with an accumulator (13). The charging and discharging port of the accumulator (13) is connected to the oil supply pipe (12). The charging and discharging port of the accumulator (13) is located between the high-pressure ball valve (11) and the connecting pipe.

8. The energy-saving hydraulic fluid supply system according to claim 7, characterized in that, Also includes: The first overflow valve (14) has an oil inlet connected to the oil supply pipe (12) and an overflow port connected to the return oil tank (4). The oil inlet of the first overflow valve (14) is located between the charging and discharging port of the accumulator (13) and the high-pressure ball valve (11). The second pressure sensor (10) has its measuring port located between the oil inlet of the first relief valve (14) and the high-pressure ball valve (11).

9. The energy-saving hydraulic fluid supply system according to claim 8, characterized in that: The oil inlet of the first overflow valve (14) is connected to the oil inlet of the two-position four-way directional valve (15), the oil return port of the two-position four-way directional valve (15) is connected to the oil return tank (4), the second oil outlet of the two-position four-way directional valve (15) is connected to the oil inlet of the first overflow valve (14), and the first oil outlet of the two-position four-way directional valve (15) is connected to the oil return tank (4).

10. The energy-saving hydraulic fluid supply system according to claim 9, characterized in that: The oil inlet of the first overflow valve (14) is connected to the oil inlet of the two-position four-way reversing valve (15) through the throttle valve (16); The second oil outlet of the two-position four-way directional valve (15) is connected to the oil inlet of the first overflow valve (14) through the throttle valve (16); The orifice of the two-position four-way directional valve (15) is smaller than that of the solenoid relief valve (6).

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