CN220337168U - Oil-passing prevention energy accumulator and hydraulic system - Google Patents

Abstract

The utility model discloses an oil-passing prevention energy accumulator and a hydraulic system, which comprise: the device comprises a container, a piston and an oil guide structure, wherein an air pressure cavity and an oil pressure cavity are arranged in the container; the piston is movably arranged in the container and separates the air pressure cavity from the oil pressure cavity, and the piston is tightly abutted against the inner wall of the container; the oil guide structure is arranged between the piston and the oil pressure cavity, an isolation oil groove is arranged between the piston and the inner wall of the container, the oil guide structure can drive hydraulic oil in the isolation oil groove to permeate into the oil pressure cavity, and the container and the piston can be matched and sealed to isolate the oil groove and the air pressure cavity. Because the isolation oil groove and the air pressure cavity are sealed, the pressure oil flows into the isolation oil groove and flows back into the oil pressure cavity under the guidance of the oil guide structure, so that the pressure oil is directly and effectively prevented from flowing into the air pressure cavity, and further the problems of unstable pressure, high rejection rate of die-casting products and the like caused by executing the action of the injection oil cylinder are effectively avoided.

Description

Oil-passing prevention energy accumulator and hydraulic system

Technical Field

The utility model relates to the field of hydraulic pressure, in particular to an oil-passing prevention energy accumulator and a hydraulic system.

Background

It is known that energy accumulators store energy mainly by the movement of their pistons and by compressing gases such as nitrogen. However, in the actual normal use process of the energy accumulator, the piston is not wetted and is in a dry grinding state, so that the sealing element is extremely easy to wear and even the inner hole of the nitrogen cylinder is damaged by pulling. And can also lead to often having the pressure oil to permeate to the region that nitrogen gas is located through the piston seal in, cause the impure, the actual volume of nitrogen gas diminishes, the production of problems such as nitrogen gas pressure rise to lead to carrying out injection hydro-cylinder action and pressure unstability, the die-casting product disability rate is high.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the oil-passing prevention energy accumulator which can slow down or prevent pressure oil from penetrating into the area where nitrogen is located.

The utility model also provides a hydraulic system with the oil-passing prevention energy accumulator.

An anti-oil-passing accumulator according to an embodiment of the first aspect of the present utility model includes: the device comprises a container, a piston and an oil guide structure, wherein an air pressure cavity and an oil pressure cavity are arranged in the container; the piston is movably arranged in the container and separates the air pressure cavity from the oil pressure cavity, and the piston is tightly abutted against the inner wall of the container; the oil guide structure is arranged between the piston and the oil pressure cavity, an isolation oil groove is arranged between the piston and the inner wall of the container, the oil guide structure can drive hydraulic oil in the isolation oil groove to permeate into the oil pressure cavity, and the container and the piston can be matched and sealed to isolate the oil groove and the air pressure cavity.

The oil-passing prevention energy accumulator provided by the embodiment of the utility model has at least the following beneficial effects: when the piston moves in the container, the gas in the pneumatic cavity can be compressed or relaxed under the force of the pressure oil in the hydraulic cavity, so that the energy storage effect is achieved. When the piston moves, a gap may be created between it and the inner wall of the container and cause pressurized oil to flow into the gap. At this moment, because keep apart between oil groove and the atmospheric pressure chamber and be sealed, consequently pressure oil will flow to keep apart in the oil groove to in the backward flow to the oil pressure chamber under the guide of oil guide structure, thereby directly, effectively avoid pressure oil to flow to the atmospheric pressure intracavity, and then avoid executing the emergence of the high scheduling problem of injection cylinder action and unstable pressure, die casting product disability rate effectively.

According to some embodiments of the utility model, the oil guiding structure comprises an oil guiding channel arranged on the piston, the oil guiding channel is communicated with the oil pressure cavity and the isolation oil groove, and a one-way valve is arranged in the oil guiding channel.

According to some embodiments of the utility model, the oil-isolating groove is provided on a side wall of the piston, and the oil-guiding channel extends from a groove bottom of the oil-isolating groove to an end of the piston.

According to some embodiments of the utility model, a mounting cavity is arranged at one end of the oil guide channel, which is contacted with the oil pressure cavity, the one-way valve is arranged in the mounting cavity, and the one-way valve can only allow fluid to flow from the isolating oil groove into the oil pressure cavity.

According to some embodiments of the utility model, a sealing structure is provided between the piston and the pneumatic chamber, the sealing structure being capable of blocking movement of fluid from the oil sump into the pneumatic chamber.

According to some embodiments of the utility model, the sealing structure comprises a first mounting groove arranged on the piston, and a gas seal sealing piece is arranged in the first mounting groove and tightly abutted against the inner wall of the container through gas pressure.

According to some embodiments of the utility model, the sealing structure comprises a second mounting groove arranged on the piston, and an oil seal sealing piece is arranged in the second mounting groove and tightly abutted against the inner wall of the container through oil pressure.

According to some embodiments of the utility model, the second mounting groove is located between the isolation oil groove and the oil pressure chamber.

According to some embodiments of the utility model, the sealing structure comprises a wear ring sleeved on the periphery of the piston, and the wear ring abuts against the inner wall of the container.

The hydraulic system according to an embodiment of the second aspect of the utility model comprises an anti-oil-passing accumulator according to an embodiment of the above-described first aspect of the utility model.

The hydraulic system provided by the embodiment of the utility model has at least the following beneficial effects: when the piston moves in the container, the gas in the pneumatic cavity can be compressed or relaxed under the force of the pressure oil in the hydraulic cavity, so that the energy storage effect is achieved. When the piston moves, a gap may be created between it and the inner wall of the container and cause pressurized oil to flow into the gap. At this moment, because keep apart between oil groove and the atmospheric pressure chamber and be sealed, consequently pressure oil will flow to keep apart in the oil groove to in the backward flow to the oil pressure chamber under the guide of oil guide structure, thereby directly, effectively avoid pressure oil to flow to the atmospheric pressure intracavity, and then avoid executing the emergence of the high scheduling problem of injection cylinder action and unstable pressure, die casting product disability rate effectively.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic diagram of an anti-over-oil accumulator according to an embodiment of the present utility model;

FIG. 2 is an enlarged schematic view at A shown in FIG. 1;

fig. 3 is a schematic view of a piston of the anti-oil-passing accumulator shown in fig. 1.

Reference numerals: a container 100; a pneumatic chamber 130; an oil pressure chamber 170; a piston 200; a first mounting groove 210; a second mounting groove 220; an oil guide channel 250; a mounting cavity 255; an oil guiding structure 300; an isolation oil sump 310; an oil seal 320; wear ring 330; a one-way valve 350; a gas seal 370; a sealing structure 700;

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

Referring to fig. 1, an oil-passing prevention accumulator includes: the container 100, the piston 200 and the oil guide structure 300 are internally provided with an air pressure cavity 130 and an oil pressure cavity 170; the piston 200 is movably installed in the container 100 and separates the air pressure cavity 130 and the oil pressure cavity 170, and the piston 200 is closely abutted against the inner wall of the container 100; the oil guiding structure 300 is arranged between the piston 200 and the oil pressure cavity 170, an isolation oil groove 310 is arranged between the piston 200 and the inner wall of the container 100, the oil guiding structure 300 can drive hydraulic oil in the isolation oil groove 310 to permeate into the oil pressure cavity 170, and the container 100 and the piston 200 can be matched to seal the isolation oil groove 310 and the air pressure cavity 130. When the piston 200 moves in the container 100, the gas in the pneumatic chamber 130 can be compressed or relaxed under the force of the pressure oil in the hydraulic chamber 170, so as to achieve the energy storage effect. When the piston 200 moves, a gap may be created between it and the inner wall of the container 100 and cause pressurized oil to flow into the gap. At this time, since the space between the isolation oil groove 310 and the air pressure cavity 130 is sealed, the pressure oil will flow into the isolation oil groove 310 and flow back into the oil pressure cavity 170 under the guidance of the oil guiding structure 300, so as to directly and effectively avoid the pressure oil flowing into the air pressure cavity 130, and further effectively avoid the problems of unstable pressure, high rejection rate of die casting products, etc. when the injection oil cylinder is operated.

In some embodiments, referring to fig. 2, the oil guiding structure 300 includes an oil guiding channel 250 formed in the piston 200, the oil guiding channel 250 communicates with the oil pressure chamber 170 and the isolation oil groove 310, and a check valve 350 is disposed in the oil guiding channel 250. During penetration of the pressurized oil from the oil pressure chamber 170 toward the air pressure chamber 130, the pressurized oil will enter the isolation oil sump 310 between the oil pressure chamber 170 and the air pressure chamber 130. When the accumulator releases the pressurized oil in the oil pressure chamber 170, a depressurization will occur in the oil pressure chamber 170 and cause the piston 200 to move toward the oil pressure chamber 170. At this time, the pressure oil in the isolation oil groove 310 will move in the oil guide channel 250 under the pressure generated by the movement of the piston 200, and the check valve 350 is opened under the pressure, so that the pressure oil in the isolation oil groove 310 can smoothly flow back into the oil pressure cavity 170, and the effect of slowing down or avoiding the pressure oil from entering the air pressure cavity 130 can be smoothly and effectively achieved.

It is envisioned that the check valve 350 may also be configured to communicate with the oil isolation groove 310 from the direction of the oil pressure chamber 170, so as to actively convey pressure oil to the oil isolation groove 310 and lubricate between the piston 200 and the inner wall of the container 100, thereby directly and effectively avoiding abrasion between the piston 200 and the inner wall of the container 100, and ensuring smooth and stable operation of the piston 200. Of course, the check valve 350 may be replaced by a two-way valve, and a different effect may be achieved by controlling the passage of the two-way valve. The specific embodiments can be adjusted according to actual needs, and are not limited herein.

In some embodiments, referring to fig. 3, the isolation oil groove 310 is opened at a sidewall of the piston 200, and the oil guide channel 250 extends from a groove bottom of the isolation oil groove 310 to an end of the piston 200. The oil-isolating groove 310 formed in the sidewall of the piston 200 can smoothly flush and butt-joint the notch thereof with the inner wall of the container 100, thereby facilitating the entry of the pressure oil into the oil-isolating groove 310. When the pressure oil flows towards the oil pressure cavity 170 through the oil guide channel 250, the pressure oil flows out from the end of the piston 200 to the oil pressure cavity 170, so that the pressure oil can be effectively prevented from flowing out from the oil guide channel 250 and then entering between the piston 200 and the inner wall of the container 100, and the purpose of preventing the pressure oil from penetrating into the air pressure cavity 130 can be effectively achieved.

In some embodiments, referring to fig. 3, the end of the oil gallery 250 in contact with the oil pressure chamber 170 is provided with a mounting chamber 255, and a check valve 350 is mounted within the mounting chamber 255, the check valve 350 being capable of and only allowing fluid to flow from the isolation oil sump 310 into the oil pressure chamber 170. The mounting cavity 255 can smoothly mount the check valve 350, thereby effectively avoiding the problem of the check valve 350 falling off when the piston 200 moves again. The restriction effect of the check valve 350 on the unidirectional flow of the pressure oil can effectively avoid the pressure oil in the oil pressure chamber 170 flowing to the isolation oil groove 310 through the oil guiding channel 250, thereby preventing the oil in the isolation oil groove 310 from overflowing.

In some embodiments, referring to fig. 2, a seal 700 is disposed between the piston 200 and the pneumatic chamber 130, the seal 700 being capable of impeding movement of fluid from the oil sump 310 into the pneumatic chamber 130. The sealing structure 700 can effectively seal the two sides of the isolation oil groove 310, so as to avoid the pressure oil from passing through the isolation oil groove 310 and entering the air pressure cavity 130 as much as possible, and further to smoothly and effectively avoid the pressure oil from penetrating into the air pressure cavity 130 and damaging the accumulator.

It is contemplated that the seal 700 may be disposed between the oil pressure chamber 170 and the oil separator tank 310, between the oil separator tank 310 and the air pressure chamber 130, or both. The specific embodiments can be adjusted according to actual needs, and are not limited herein.

In some embodiments, referring to fig. 2, the sealing structure 700 includes a first mounting groove 210 formed in the piston 200, and a gas seal 370 is disposed in the first mounting groove 210, wherein the gas seal 370 is tightly abutted against the inner wall of the container 100 by gas pressure. The air seal sealing member 370 tightly abutted against the inner wall of the container 100 by air pressure not only can effectively block the flow of the pressure oil, but also can effectively reduce the relative friction between the air seal sealing member 370 and the inside of the first installation groove 210, so that the movement of the piston 200 can be more smoothly performed, and further the problem of blockage is avoided.

Specifically, the air seal 370 is a rubber seal and is installed in the first installation groove 210 by filling high-pressure gas. The first mounting groove 210 is located between and relatively isolates the oil sump 310 from the plenum 130. Of course, the specific components of the air seal 370 are not unique, the first mounting groove 210 may be disposed at other positions, and the specific embodiment may be correspondingly adjusted according to actual needs, which is not limited herein.

In some embodiments, referring to fig. 2, the sealing structure 700 includes a second mounting groove 220 formed in the piston 200, and an oil seal 320 is disposed in the second mounting groove 220, wherein the oil seal 320 is tightly abutted against the inner wall of the container 100 by oil pressure. The oil seal 320 not only can perform primary sealing operation between the oil pressure chamber 170 and the oil isolation groove 310 and prevent the pressure oil from directly penetrating from the oil pressure chamber 170 into the oil isolation groove 310, but also can perform relative movement between the piston 200 and the inner wall of the container 100, and when a gap is generated between the piston 200 and the inner wall of the container 100, the pressure oil in the oil seal will firstly enter between the piston 200 and the inner wall of the container 100, so as to lubricate the piston 200 and the inner wall of the container 100 relatively, and further can directly and effectively achieve the effect of avoiding damage between the piston 200 and the inner wall of the container 100.

Specifically, the oil seal 320 is a rubber packing, and is installed in the second installation groove 220 by filling pressure oil. The second mounting groove 220 is located between and relatively isolates the oil pressure chamber 170 and the isolation oil sump 310. Of course, the specific components of the oil seal 320 are not unique, and the second mounting groove 220 may be disposed at other positions, and the specific embodiment may be adjusted accordingly according to actual needs, which is not limited herein.

In certain embodiments, referring to fig. 2, the second mounting groove 220 is located between the isolation oil sump 310 and the oil pressure chamber 170. The second mounting groove 220 between the isolation oil groove 310 and the oil pressure chamber 170 can accommodate the pressure oil primarily permeated in the oil pressure chamber 170, thereby further preventing the pressure oil from permeating into the air pressure chamber 130, and further ensuring that the accumulator can operate smoothly and stably.

In certain embodiments, referring to fig. 2, the sealing structure 700 includes a wear ring 330 sleeved on the outer periphery of the piston 200, the wear ring 330 abutting against the inner wall of the container 100. During the movement of the piston 200, there will frequently be relative friction with the inner wall of the container 100. The wear sleeve can well resist the wear problem during the friction process, thereby effectively improving the stability of the piston 200 during continued use.

A second aspect of the utility model provides an embodiment of a hydraulic system comprising the above anti-oil-passing accumulator. When the piston 200 moves in the container 100, the gas in the pneumatic chamber 130 can be compressed or relaxed under the force of the pressure oil in the hydraulic chamber 170, so as to achieve the energy storage effect. When the piston 200 moves, a gap may be created between it and the inner wall of the container 100 and cause pressurized oil to flow into the gap. At this time, since the space between the isolation oil groove 310 and the air pressure cavity 130 is sealed, the pressure oil will flow into the isolation oil groove 310 and flow back into the oil pressure cavity 170 under the guidance of the oil guiding structure 300, so as to directly and effectively avoid the pressure oil flowing into the air pressure cavity 130, and further effectively avoid the problems of unstable pressure, high rejection rate of die casting products, etc. when the injection oil cylinder is operated.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.

Claims (10)

1. An anti-oil-passing accumulator, comprising:

a container (100) provided with an air pressure chamber (130) and an oil pressure chamber (170) inside;

the piston (200) is movably arranged in the container (100) and separates the air pressure cavity (130) and the oil pressure cavity (170), and the piston (200) is closely abutted against the inner wall of the container (100);

the oil guide structure (300) is arranged between the piston (200) and the oil pressure cavity (170), an isolation oil groove (310) is formed between the piston (200) and the inner wall of the container (100), the oil guide structure (300) can drive hydraulic oil in the isolation oil groove (310) to permeate into the oil pressure cavity (170), and the container (100) and the piston (200) can be matched and sealed to isolate the oil groove (310) and the air pressure cavity (130).

2. The anti-oil-through accumulator of claim 1, wherein:

the oil guide structure (300) comprises an oil guide channel (250) which is formed in the piston (200), the oil guide channel (250) is communicated with the oil pressure cavity (170) and the isolation oil groove (310), and a one-way valve (350) is arranged in the oil guide channel (250).

3. The anti-oil-through accumulator of claim 2, wherein:

the isolating oil groove (310) is formed in the side wall of the piston (200), and the oil guide channel (250) extends from the bottom of the isolating oil groove (310) to the end part of the piston (200).

4. An anti-oil-through accumulator as claimed in claim 3, wherein:

an installation cavity (255) is arranged at one end, contacted with the oil pressure cavity (170), of the oil guide channel (250), the one-way valve (350) is installed in the installation cavity (255), and the one-way valve (350) can only allow fluid to flow from the isolation oil groove (310) into the oil pressure cavity (170).

5. The anti-oil-through accumulator of claim 1, wherein:

a sealing structure (700) is arranged between the piston (200) and the air pressure cavity (130), and the sealing structure (700) can prevent fluid from moving from the isolation oil groove (310) to the air pressure cavity (130).

6. The anti-oil-through accumulator of claim 5, wherein:

the sealing structure (700) comprises a first mounting groove (210) formed in the piston (200), a gas seal sealing piece (370) is arranged in the first mounting groove (210), and the gas seal sealing piece (370) is tightly abutted to the inner wall of the container (100) through air pressure.

7. The anti-oil-through accumulator of claim 5, wherein:

the sealing structure (700) comprises a second mounting groove (220) formed in the piston (200), an oil seal sealing element (320) is arranged in the second mounting groove (220), and the oil seal sealing element (320) is tightly abutted to the inner wall of the container (100) through oil pressure.

8. The anti-oil-through accumulator of claim 7, wherein:

the second mounting groove (220) is located between the isolation oil groove (310) and the oil pressure chamber (170).

9. The anti-oil-through accumulator of claim 6, wherein:

the sealing structure (700) comprises a wear-resistant ring (330) sleeved on the periphery of the piston (200), and the wear-resistant ring (330) is abutted against the inner wall of the container (100).

10. A hydraulic system comprising an anti-oil-passing accumulator according to any one of claims 1 to 9.