阅读说明：本技术 一种高压蓄能泵站 (High-pressure energy storage pump station ) 是由 袁茂凯 文春领 于 2020-07-02 设计创作，主要内容包括：本发明提供一种高压蓄能泵站,包括与液压机构连接的低压蓄能器、中压蓄能器以及高压蓄能器,低压蓄能器连接低压泵,中压蓄能器和高压蓄能器连接高压泵；低压泵以及高压泵上均设有控制阀,且在低压泵与低压蓄能器间、以及高压泵与中压蓄能器间均设有单向阀；所述高压泵与高压蓄能器间设有高压蓄能装置。本发明结构设计合理,工作稳定可靠,通过高压泵经高压蓄能装置向高压蓄能器储能,能够有效实现供给至压射机构压力的提高,而在其它较低压力需求的液压机构驱动的动作中,通过中压蓄能器或低压蓄能器供油,不会出现功率过裕量太多的损耗问题,合理解决了功率匹配和能耗的问题。(The invention provides a high-pressure energy storage pump station, which comprises a low-pressure energy accumulator, a medium-pressure energy accumulator and a high-pressure energy accumulator, wherein the low-pressure energy accumulator, the medium-pressure energy accumulator and the high-pressure energy accumulator are connected with a hydraulic mechanism; control valves are arranged on the low-pressure pump and the high-pressure pump, and one-way valves are arranged between the low-pressure pump and the low-pressure energy accumulator and between the high-pressure pump and the medium-pressure energy accumulator; and a high-pressure energy storage device is arranged between the high-pressure pump and the high-pressure energy accumulator. The invention has reasonable structural design and stable and reliable work, can effectively realize the improvement of the pressure supplied to the injection mechanism by storing energy to the high-pressure energy accumulator through the high-pressure energy storage device by the high-pressure pump, can not generate the loss problem of too much power allowance by supplying oil through the medium-pressure energy accumulator or the low-pressure energy accumulator in the action of driving other hydraulic mechanisms with lower pressure requirements, and reasonably solves the problems of power matching and energy consumption.)

1. A high-pressure energy storage pump station which is characterized in that: the hydraulic system comprises a low-pressure energy accumulator, a medium-pressure energy accumulator and a high-pressure energy accumulator which are connected with a hydraulic mechanism, wherein the low-pressure energy accumulator is connected with a low-pressure pump, and the medium-pressure energy accumulator and the high-pressure energy accumulator are connected with a high-pressure pump; the low-pressure pump and the high-pressure pump are both provided with control valves, and one-way valves are arranged between the low-pressure pump and the low-pressure energy accumulator and between the high-pressure pump and the medium-pressure energy accumulator;

and a high-pressure energy storage device is arranged between the high-pressure pump and the high-pressure energy accumulator, and the high-pressure energy storage device comprises a high-pressure plunger pump and a high-pressure energy storage electromagnetic valve for controlling the action of the high-pressure plunger pump.

2. The high pressure energy storage pump station according to claim 1, characterized in that: a first pressure relay and an energy storage control one-way valve are arranged in a low-pressure pipeline connecting the low-pressure energy accumulator and the hydraulic mechanism; and a second pressure relay and a medium-pressure energy storage control valve are arranged in a medium-pressure pipeline connecting the medium-pressure energy accumulator and the hydraulic mechanism.

3. The high pressure energy storage pump station according to claim 2, characterized in that: and the pressure oil in the low-pressure pipeline and the pressure oil in the medium-pressure pipeline are both output to the hydraulic mechanism through the flow valves.

4. The high pressure energy storage pump station according to claim 2, characterized in that: the medium-pressure energy storage control valve adopts a two-position four-way electromagnetic directional valve.

5. The high pressure energy storage pump station according to claim 1, characterized in that: the control valve adopts a two-position four-way electromagnetic reversing valve.

6. The high pressure energy storage pump station according to claim 1, characterized in that: the electromagnetic valve adopts a three-position four-way electromagnetic reversing valve with O-shaped function.

7. The high pressure energy storage pump station according to claim 1, characterized in that: the high-pressure plunger pump comprises a low-pressure cylinder body provided with a bidirectional booster piston, wherein two ends of the low-pressure cylinder body are respectively provided with a high-pressure cylinder body, the bidirectional booster piston comprises a first piston body matched with the low-pressure cylinder body and a second piston body, two ends of the second piston body are respectively matched with the high-pressure cylinder body, low-pressure cylinder annular cavities are formed in the low-pressure cylinder body at two sides of the first piston body, and a high-pressure cylinder annular cavity is formed between the second piston body and the high-pressure cylinder body at the corresponding side.

8. The high pressure energy storage pump station according to claim 7, characterized in that: each high-pressure cylinder body is provided with an end cavity, and a high-pressure energy storage one-way valve is arranged between each end cavity and the high-pressure energy storage electromagnetic valve and between each end cavity and the hydraulic mechanism; and the end part of the second piston body is provided with a matching part which is matched with the end part cavity and can close the end part cavity.

9. The high pressure energy storage pump station according to claim 7, characterized in that: the sum of the area of the end cavity in each high-pressure cylinder body and the area of the annular cavity of the high-pressure cylinder in the high-pressure cylinder body is equal to the area of the annular cavity of the low-pressure cylinder.

Technical Field

The invention belongs to the technical field of hydraulic equipment, and particularly relates to a high-pressure energy storage pump station.

Background

The pump station is a power source of the hydraulic mechanism, and the energy configuration of the pump station directly determines the action performance and the energy consumption of the hydraulic system. For the hydraulic mechanism of the die casting machine, because different functional requirements exist in different action stages, a pump station is required to be capable of providing different pressure and flow output. The power of the pump station is the product of pressure and flow, and as the flow and pressure of the pump station need to fluctuate greatly by the hydraulic mechanism, the input power of the pump station also has a large variation range, and technicians usually have to seek proper coordination among the pressure, the flow and the power. In particular, the pressure level has to be lowered in view of cost, energy consumption, etc. in selecting the high pressure. For a common hydraulic mechanism such as a hydraulic machine, the function of the hydraulic mechanism is mainly to provide force, and a hydraulic pump station basically meets the functional requirements as long as the magnitude of the output force is met, but for an injection mechanism of a die casting machine, the dynamic process requirements of the injection mechanism, such as acceleration in slow-to-fast transition, are met more importantly besides the magnitude of the injection force. According to Newton's law, the acceleration is in direct proportion to the acting force and in inverse proportion to the mass, so that under the condition that the injection mechanism is not changed, the pressure of the injection system is increased, and the acceleration of the injection motion can be increased. The pressure provided by the pump station to the injection system is improved, and the essence is that higher energy is provided for the injection system, so that the injection mechanism is pushed by huge power to realize high-speed high-pressure injection and shorten the transition time of motion change, and further the injection performance of the die casting machine is improved. However, increasing the pressure applied to the injection mechanism by the pumping station of the die-casting machine requires increasing the motor power of the pumping station, and in the driving action of other hydraulic mechanisms, the excessive margin of the power will cause too much power loss, and improvement is needed.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a high-pressure energy storage pump station.

In order to solve the technical problem, the technical scheme of the invention is realized as follows:

a high-pressure energy storage pump station comprises a low-pressure energy accumulator, a medium-pressure energy accumulator and a high-pressure energy accumulator which are connected with a hydraulic mechanism, wherein the low-pressure energy accumulator is connected with a low-pressure pump; the low-pressure pump and the high-pressure pump are both provided with control valves, and one-way valves are arranged between the low-pressure pump and the low-pressure energy accumulator and between the high-pressure pump and the medium-pressure energy accumulator;

and a high-pressure energy storage device is arranged between the high-pressure pump and the high-pressure energy accumulator, and the high-pressure energy storage device comprises a high-pressure plunger pump and a high-pressure energy storage electromagnetic valve for controlling the action of the high-pressure plunger pump.

Furthermore, a first pressure relay and an energy storage control one-way valve are arranged in a low-pressure pipeline connecting the low-pressure energy accumulator and the hydraulic mechanism; and a second pressure relay and a medium-pressure energy storage control valve are arranged in a medium-pressure pipeline connecting the medium-pressure energy accumulator and the hydraulic mechanism.

Furthermore, the pressure oil in the low-pressure pipeline and the pressure oil in the medium-pressure pipeline are both output to the hydraulic mechanism through the flow valves.

Furthermore, the medium-pressure energy storage control valve adopts a two-position four-way electromagnetic directional valve.

Furthermore, the control valve adopts a two-position four-way electromagnetic directional valve.

Furthermore, the electromagnetic valve adopts a three-position four-way electromagnetic reversing valve with O-shaped function.

Furthermore, the high-pressure plunger pump comprises a low-pressure cylinder body provided with a bidirectional booster piston, two ends of the low-pressure cylinder body are respectively provided with a high-pressure cylinder body, the bidirectional booster piston comprises a first piston body matched with the low-pressure cylinder body and a second piston body, two ends of the second piston body are respectively matched with the high-pressure cylinder body, low-pressure cylinder annular cavities are formed in the low-pressure cylinder body at two sides of the first piston body, and a high-pressure cylinder annular cavity is formed between the second piston body and the high-pressure cylinder body at the corresponding side.

Furthermore, each high-pressure cylinder body is provided with an end cavity, and high-pressure energy storage one-way valves are arranged among the end cavity, the high-pressure energy storage electromagnetic valve and the hydraulic mechanism; and the end part of the second piston body is provided with a matching part which is matched with the end part cavity and can close the end part cavity.

Furthermore, the sum of the area of the end cavity in each high-pressure cylinder body and the area of the annular cavity of the high-pressure cylinder in the high-pressure cylinder body is equal to the area of the annular cavity of the low-pressure cylinder.

The invention has the advantages and positive effects that:

the invention has reasonable structural design and stable and reliable work, can effectively realize the improvement of the pressure supplied to the injection mechanism by storing energy to the high-pressure energy accumulator through the high-pressure energy storage device by the high-pressure pump under the condition of certain motor power, and can not generate the problem of too much power over-allowance loss by supplying oil through the medium-pressure energy accumulator or the low-pressure energy accumulator in the action of driving other hydraulic mechanisms with lower pressure requirements, thereby reasonably solving the problems of power matching and energy consumption.

Drawings

FIG. 1 is a schematic view of the present invention;

fig. 2 is a schematic view of a high pressure plunger pump of the present invention.

In the figure: 1-a low pressure accumulator; 2-a medium pressure accumulator; 3-a high pressure accumulator; 4-a low pressure pump; 5-a high pressure pump; 6-a control valve; 7-a one-way valve; 8-high pressure plunger pump; 9-high pressure energy storage electromagnetic valve; 10-a first pressure relay; 11-energy storage control one-way valve; 12-a second pressure relay; 13-a medium pressure energy storage control valve; 14-flow valve; 15-low pressure cylinder; 16-a high-pressure cylinder body; 17-a bidirectional booster piston; 18-a first piston body; 19-a second piston body; 20-low pressure cylinder ring cavity; 21-high pressure cylinder annular cavity; 22-end cavity; 23-high pressure energy storage check valve; 24-a mating portion; 25-a motor; 26-third pressure relay.

Detailed Description

It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.

The following is a detailed description of specific embodiments of the invention.

A high-pressure energy storage pump station is shown in figures 1 and 2 and comprises a low-pressure energy accumulator 1, a medium-pressure energy accumulator 2 and a high-pressure energy accumulator 3 which are connected with a hydraulic mechanism, wherein the low-pressure energy accumulator is connected with a low-pressure pump 4, the medium-pressure energy accumulator and the high-pressure energy accumulator are both supplied with pressure oil by a high-pressure pump 5, and the low-pressure pump and the high-pressure pump are driven by a motor 25; the low-pressure pump and the high-pressure pump are both provided with control valves 6, and check valves 7 are arranged between the low-pressure pump and the low-pressure accumulator and between the high-pressure pump and the medium-pressure accumulator, as shown in fig. 1, a check valve V4 is arranged at the low-pressure pump, and a check valve V8 is arranged at the high-pressure pump;

and a high-pressure energy storage device is arranged between the high-pressure pump and the high-pressure energy accumulator, and comprises a high-pressure plunger pump 8 and a high-pressure energy storage electromagnetic valve 9 for controlling the action of the high-pressure plunger pump.

A first pressure relay 10 and an energy storage control one-way valve 11 are arranged in a low-pressure pipeline connecting the low-pressure energy accumulator and the hydraulic mechanism; a second pressure relay 12 and a medium pressure energy storage control valve 13 are arranged in a medium pressure pipeline connecting the medium pressure energy accumulator and the hydraulic mechanism, and a third pressure relay 26 is arranged in a pipeline connecting the high pressure energy accumulator and the hydraulic mechanism.

The pressure oil in the low-pressure pipeline and the pressure oil in the medium-pressure pipeline are both output to the hydraulic mechanism through the flow valve 14.

The medium-pressure energy storage control valve adopts a two-position four-way electromagnetic directional valve. The control valve adopts a two-position four-way electromagnetic reversing valve. The electromagnetic valve adopts a three-position four-way electromagnetic reversing valve with O-shaped function.

The high-pressure plunger pump comprises a low-pressure cylinder body 15 provided with a bidirectional booster piston 17, wherein two ends of the low-pressure cylinder body are respectively provided with a high-pressure cylinder body 16, the bidirectional booster piston comprises a first piston body 18 matched with the low-pressure cylinder body and second piston bodies 19 with two ends respectively matched with the high-pressure cylinder body, low-pressure cylinder annular cavities 20 are formed in the low-pressure cylinder body at two sides of the first piston body, and high-pressure cylinder annular cavities 21 are formed between the second piston body and the high-pressure cylinder body at the corresponding side.

Each high-pressure cylinder body is provided with an end cavity 22, and a high-pressure energy storage one-way valve 23 is arranged between each end cavity and the high-pressure energy storage electromagnetic valve and between each end cavity and the hydraulic mechanism; and the end parts of the second piston bodies are provided with matching parts 24 which are matched with the end part cavities and can close the end part cavities. Generally, the sum of the area of the end cavity in each high-pressure cylinder body and the area of the annular cavity of the high-pressure cylinder in the high-pressure cylinder body is equal to the area of the annular cavity of the low-pressure cylinder.

The structure is shown in fig. 1 and 2, a first high-pressure energy storage one-way valve V14 is arranged in a pipeline connected with a left end cavity and a high-pressure energy storage solenoid valve, a second high-pressure energy storage one-way valve V16 is arranged in a pipeline connected with a hydraulic mechanism (wherein, the first high-pressure energy storage one-way valve is used for controlling pressure oil to flow in the left end cavity, the second high-pressure energy storage one-way valve is used for controlling pressure oil to flow to one side of the hydraulic mechanism), a third high-pressure energy storage one-way valve V15 is arranged in a pipeline connected with the right end cavity and the high-pressure energy storage solenoid valve, and a fourth high-pressure energy storage one-way valve V17 is arranged in a pipeline connected with the hydraulic mechanism (wherein, the third high-pressure energy storage one-way valve is used for controlling pressure oil to flow in the right.

The working principle of the high-pressure plunger pump is as follows:

when the coil S2 at the right end of the V13 is electrified, the P, A port and the B, T port of the electromagnetic valve V13 are communicated. Pressure oil enters a left end annular cavity formed by the bidirectional booster piston and the low-pressure cylinder body from the port P through the port A, and simultaneously enters a left end cavity of the high-pressure cylinder body 1 through the one-way valve V14, the area A1 of the left end cavity of the high-pressure cylinder body and the area of the annular cavity of the bidirectional booster piston are just equal to the area A2 of the low-pressure cylinder body, and therefore the acting force area of the pressure oil at the left end of the bidirectional booster piston is A2; the annular cavity at the right end of the bidirectional booster piston is communicated with the port B of the V13 to return to the oil tank, and the pressure is zero; the bidirectional booster piston moves rightwards to form booster pressure P in a cavity at the right end of the high-pressure cylinder body 1, and the booster pressure P is output through a one-way valve V17;

when the coil S1 at the right end of the high-pressure energy storage electromagnetic valve V13 is electrified, the P, B port and the T, A port of the electromagnetic valve V13 are communicated. Pressure oil enters a right end annular cavity formed by the bidirectional booster piston and the low-pressure cylinder body from the port P through the port B, and simultaneously enters a right end cavity of the high-pressure cylinder body through a third high-pressure energy storage one-way valve V15, the area A1 of the right end cavity of the high-pressure cylinder body and the area of the right annular cavity of the bidirectional booster piston are just equal to the area A2 of the low-pressure cylinder body, and therefore the acting force area of the pressure oil on the right end face of the bidirectional booster piston is A2; the annular cavity at the left end of the bidirectional booster piston is communicated with the port A of the V13 to return to the oil tank, and the pressure is zero; the bidirectional booster piston moves leftwards, booster pressure P is formed in the cavity at the left end of the high-pressure cylinder body, and the booster pressure P is output through a one-way valve V16; setting P port input of electromagnetic valve V13And if the pressure is Po, the output pressure of the bidirectional booster plunger pump is as follows:

when the pressures of the energy accumulators A1, A2 and A3 reach the set values of the corresponding pressure relays B1, B2 and B3, all the control valves are not electrified, and the oil output by the oil pump directly returns to the oil tank for unloading operation. It should be noted that, for a three-phase asynchronous motor, when the high-pressure pump V7 and the low-pressure pump V2 are both in an unloading state, the delta connection operation of the three-phase asynchronous motor can be converted into star connection operation through a relay, so that the no-load operation loss of the motor is reduced, and the three-phase asynchronous motor is good in energy saving and environmental protection.

The working process of the high-pressure energy storage pump station is as follows:

as shown in fig. 1 and 2, when the solenoids of the control valves V9 and V3 are not energized, the oil output from the low-pressure pump and the high-pressure pump is directly returned to the oil tank through the ports B of the two solenoid valves, and at this time, no pressure oil is output from the two oil pumps.

When a control valve V3 of the low-pressure pump is electrified, the electromagnetic valve V3 is switched, a port B and an oil return port T are disconnected, pressure oil output by the low-pressure pump V2 is charged into a low-pressure accumulator A1 through a one-way valve V4 on a low-pressure pipeline, when the pressure of A1 reaches the upper pressure limit set by a first pressure relay B1, a signal is sent by the B1 to power off an electromagnetic coil of the electromagnetic valve V3, the port B is communicated with the port T, and the oil output by the low-pressure pump returns to an oil tank for unloading; when the pressure of the pressure oil of the low-pressure accumulator is reduced to the lower pressure limit set by the first pressure relay B1, the B1 sends a signal to enable the electromagnetic valve V3 to be electrified, and the oil filling process of the accumulator A1 is repeated.

When a control valve V9 of the high-pressure pump is electrified, the electromagnetic valve V9 is switched, a port B and an oil return port T are disconnected, pressure oil output by the high-pressure pump V7 is charged into a high-pressure accumulator A2 through a one-way valve V8 on a high-pressure pipeline, when the pressure of A2 reaches the upper pressure limit set by a second pressure relay B2, a signal is sent by B2 to power off an electromagnetic coil of the electromagnetic valve V9, the port B and the port T are communicated, and the oil return tank output by the high-pressure pump is unloaded; when the pressure of the pressure oil of the high-pressure accumulator is reduced to the lower pressure limit set by the second pressure relay B2, the B2 sends a signal to enable the electromagnetic valve V9 to be electrified, and the oil filling process of the accumulator A2 is repeated.

When pressure oil is supplied to the hydraulic mechanism:

pressure oil of the low-pressure accumulator A1 is sent to the hydraulic mechanism through an energy storage control one-way valve V5 and a flow valve V6; when the pressure required by the hydraulic mechanism is greater than the pressure of the low-pressure accumulator A1, the medium-pressure energy storage control valve V11 is electrically switched, the P port of the V11 is communicated with the B port, the pressure oil of the medium-pressure accumulator A2 flows into the input port of the flow valve V6 through the P port of the V11 and the B port, the pressure oil of the medium-pressure accumulator A2 is greater than the pressure of the low-pressure accumulator A1, so that the check valve V5 is closed by the pressure oil of the A2, the output of the pressure oil of the A1 is cut off, and at the moment, the pressure oil of the medium-pressure accumulator A2 is output by the flow valve V6.

The pressure of the high pressure accumulator a3 is controlled by a third pressure relay B3. When the pressure of A3 is lower than the set pressure lower limit of B3, B3 sends out a signal for supplementing oil pressure to A3, so that electromagnetic coils S1 and S2 at two ends of a three-position four-way high-pressure energy storage electromagnetic valve V13 are alternately electrified at fixed time intervals to push a bidirectional pressurizing piston of a high-pressure plunger pump to reciprocate left and right, high pressure is generated by the isolation function of a high-pressure energy storage one-way valve and the area ratio of the piston and is output to a high-pressure energy accumulator A3, when the pressure of A3 reaches the upper limit of the set value of a pressure relay B3, the electromagnetic coils S1 and S2 at two ends of a reversing valve V13 are all deenergized, the bidirectional pressurizing piston stops moving, and the.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof.

The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.