CN113048036B

CN113048036B - Energy accumulator oil supplementing liquid piston type compressor with high-speed switch valve

Info

Publication number: CN113048036B
Application number: CN202110176226.7A
Authority: CN
Inventors: 赵升吨; 周昊; 郭怡; 李帆; 费亮瑜
Original assignee: Xian Jiaotong University
Current assignee: Xian Jiaotong University
Priority date: 2021-02-09
Filing date: 2021-02-09
Publication date: 2022-04-05
Anticipated expiration: 2041-02-09
Also published as: GB2605690A; CN113048036A; GB2605690B

Abstract

The application discloses accumulator oil supplementing liquid piston type compressor with high-speed switch valve relates to gas compressor technical field. The displacement and the speed of the piston assembly can be accurately controlled, oil can be supplemented to the compressor in time through the energy accumulator, the piston assembly can reach the upper limit position and the lower limit position, and the collision at a high speed cannot occur. The compressor includes a drive plunger pump, a booster cylinder, and a controller. The pressure cylinder comprises a sealing cavity, a piston assembly is arranged in the sealing cavity, the sealing cavity is divided into a compression cavity and a hydraulic cavity by the piston assembly, a displacement sensor is arranged at the upper end of the piston assembly, an oil port of the hydraulic cavity is divided into two paths, one path is connected with a driving plunger pump, and the other path is sequentially connected with a high-speed switch valve and an energy accumulator; the displacement of the driving plunger pump is larger than the volume of the hydraulic cavity, the controller can receive a displacement signal transmitted by the displacement sensor and judge whether the piston assembly is at the upper limit position or the lower limit position, and if so, the high-speed switch valve is opened.

Description

Energy accumulator oil supplementing liquid piston type compressor with high-speed switch valve

Technical Field

The application relates to the technical field of gas compressors, in particular to an oil supplementing liquid piston type compressor with a high-speed switch valve for an energy accumulator.

Background

At present, most of compressors commonly used at home and abroad adopt a mechanical structure, and the mechanical compressor has a complex overall structure and a huge transmission system, so that the mechanical compressor has a short service life and low transmission efficiency under a high-pressure environment. In addition, the mechanical compressor has high noise due to the reciprocating motion and high alternation of the transmission structure in the working process. Therefore, in recent years, hydraulic compression systems are often used at higher pressures. However, the existing hydraulic compression system has the following problems:

1. the position and the speed of the piston of the compressor cannot be controlled in real time, so that the compression process of the compressor is easily uncontrollable. Specifically, under certain conditions, the compressor may not reach the same upper and lower limit positions every time due to oil leakage, so that the compression efficiency is reduced, the energy utilization rate of the compressor is greatly reduced, and larger gas output pulsation and larger vibration of the compressor are caused; in other cases, it may occur that the piston hits the upper and lower limit positions at a greater speed, which not only causes great vibrations, but also considerably shortens the service life of the compressor components.

2. The problem that hydraulic oil pollutes compressed gas can occur if an existing liquid piston compressor does not use ionic liquid to isolate hydraulic oil from the compressed gas, and the currently used ionic liquid generally has the defects of high corrosivity, high environmental pollution and the like.

Disclosure of Invention

The embodiment of the application provides an energy storage ware mends oily liquid piston compressor with high-speed ooff valve, can the displacement and the speed of accurate control piston assembly to in time for compressor supplementary fluid through the energy storage ware, guarantee that piston assembly can both reach upper and lower extreme position at every turn, and great speed collision can not appear.

In order to achieve the above object, an embodiment of the present application provides an accumulator oil-replenishing liquid piston type compressor having a high-speed switching valve, including a driving plunger pump, a compression unit, and a controller; the compression unit comprises a pressurization cylinder, the pressurization cylinder comprises a sealing cavity, a piston assembly is arranged in the sealing cavity, and the sealing cavity is divided into a compression cavity and a hydraulic cavity positioned at the lower part of the compression cavity by the piston assembly; a displacement sensor is arranged at one end of the piston assembly, which is positioned in the compression cavity; the oil port of the hydraulic cavity is divided into two paths, wherein one path is connected with the driving plunger pump, and the other path is sequentially connected with the high-speed switch valve and the energy accumulator; the driving plunger pump can drive the piston assembly to move towards the direction close to the compression cavity, and sucks liquid discharged from the hydraulic cavity into the plunger cavity when the piston assembly descends; the displacement of the plunger pump is larger than the volume of the hydraulic cavity; the controller can receive the displacement signal transmitted by the displacement sensor and judge whether the piston assembly is at the upper limit position or the lower limit position, and if so, the high-speed switch valve is opened.

Furthermore, the compression units are multiple and are arranged in series, the air inlet of the compression unit at the head end is used for being communicated with an air source, and the air outlet of the compression unit at the tail end is communicated with an air storage bottle.

Furthermore, the driving plunger pumps are multi-cylinder radial plunger pumps, the number of cylinders of the driving plunger pumps is equal to the number of the compression units, and the plungers of the driving plunger pumps correspond to the compression units one by one.

Furthermore, a buffer shaft is arranged at one end, close to the hydraulic cavity, of the piston assembly, a buffer groove disc is arranged in the hydraulic cavity, a through hole matched with the buffer shaft is formed in the buffer groove disc, the buffer groove disc divides the hydraulic cavity into a main hydraulic cavity and a buffer hydraulic cavity, and an outlet of the main hydraulic cavity is connected with the driving plunger and the high-speed switch valve respectively; the outlet of the buffer hydraulic cavity is connected with the inlet of the adjustable throttling valve and the outlet of the second one-way valve; the outlet of the adjustable throttle valve is divided into two paths, one path is connected with the driving plunger pump, and the other path is sequentially connected with the high-speed switch valve and the energy accumulator; the inlet of the second one-way valve is also divided into two paths, one path is connected with the driving plunger pump, and the other path is sequentially connected with the high-speed switch valve and the energy accumulator.

Further, the compression unit comprises a first cylinder barrel, the piston assembly comprises a first piston, the first piston can move in the first cylinder barrel, a water jacket is arranged on the outer side of the first cylinder barrel, and a cooling liquid sealed cavity is formed between the first cylinder barrel and the water jacket.

Furthermore, an upper end cover is arranged at the opening part of the compression cavity, a stopper is arranged on the bottom surface of the upper end cover, and the stopper and the piston assembly are coaxially arranged and are positioned above the piston assembly.

Further, the piston assembly is an I-shaped piston assembly.

Further, the piston assembly further comprises a first connecting shaft and a second piston, the first connecting shaft is arranged between the second piston and the first piston, and the second piston is connected with the first connecting shaft through a screw rod.

Further, the compression unit further comprises a second cylinder, the second piston can move in the second cylinder, the second cylinder and the first cylinder are connected through a flange, and the first connecting shaft can move in an inner hole of the flange.

Compared with the prior art, the application has the following beneficial effects:

1. according to the hydraulic control system, the position of the piston assembly is detected in real time through the displacement sensor, hydraulic oil is supplemented into the driving plunger pump in time through the energy accumulator and the high-speed switch valve, the upper limit position and the lower limit position of the piston assembly can be reached at every time on the premise that the displacement and the speed of the piston assembly are accurately controlled in real time, and the piston assembly is prevented from being collided at a high speed.

2. This application realizes multistage compression through the compression progression with drive plunger figure assorted, and the compression progression of distributing each grade is lower, makes the compression process more press close to isothermal compression, has improved compression efficiency and energy utilization.

3. According to the compressor, the flow is controlled through the high-speed switch valve, the displacement-time relation of the upward movement of the piston assembly is further controlled, and the compression efficiency of the compressor is improved.

4. This application is through adopting one-way buffer structure, under the condition of the energy in the stage of not losing calm the anger, has realized the buffer function in the compressor stage of admitting air, guarantees that the compressor can not collide to the bottom of second cylinder because of high inlet pressure, has realized the safe, the low vibration work of compressor.

5. This application adopts isolated hydraulic oil of I shape piston and compression chamber, has both avoided the hydraulic oil pollution by compressed gas, has avoided the corruption that uses ionic liquid to bring the compressor again and the pollution to the environment.

6. This application sets up the water jacket in the outside of first cylinder, makes to form the coolant liquid seal chamber that is used for cooling the compression chamber between first cylinder and the water jacket, and the radiating effect in compression chamber is better.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of a compressor according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a booster pump in a single compression unit of a compressor according to an embodiment of the present application;

fig. 3 is a schematic diagram of a hydraulic system for a single compression unit in a compressor according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

Referring to fig. 1 to 3, the present embodiment provides an accumulator oil-replenishing liquid piston type compressor having a high-speed switching valve, which includes a driving plunger pump 2, a compression unit 1, and a controller (not shown). One or more compression units 1 may be provided, and when there are a plurality of compression units 1, the driving plunger pump 2 is a radial plunger pump, the number of cylinders driving the plunger pump 2 is equal to the number of compression units 1, and the plungers driving the plunger pump 2 correspond to the compression units 1 one by one. The following description will be given taking five compression units 1 as an example.

Referring to fig. 1, the compressor is a five-stage compression type ultrahigh pressure compressor, five compression units 1 are provided, the five compression units 1 are connected in series, an air inlet of the compression unit 1 at the head end is communicated with an air source (not shown), and an air outlet of the compression unit 1 at the tail end is communicated with an air storage bottle 4. The air inlet and the air outlet of each compression unit 1 are provided with a first check valve 3. The first check valve 3 is used for realizing the air intake and compression processes of the compressor. The gas compressed at each stage is introduced into the next stage for continuous compression, and the ultra-high pressure gas obtained by final compression is sent into the gas storage cylinder 4 for storage.

Referring to fig. 1 and 2, each compression unit 1 includes a pressure cylinder 5, the pressure cylinder 5 includes a first cylinder 6 and a second cylinder 7 disposed at a lower portion of the first cylinder 6, a flange 8 is disposed between the first cylinder 6 and the second cylinder 7, the first cylinder 6 and the flange 8 are connected by a first threaded plate 9, and the second cylinder 7 and the flange 8 are connected by a second threaded plate 10. The first cylinder barrel 6 and the second cylinder barrel 7 jointly form a sealing cavity, a piston assembly 11 is arranged in the sealing cavity, the piston assembly 11 is I-shaped, and the sealing cavity is divided into a compression cavity 12 and a hydraulic cavity 13 by the piston assembly 11. Wherein the compression chamber 12 is located in the first cylinder 6 and the hydraulic chamber 13 is located in the second cylinder 7. The piston assembly 11 includes a first piston 14 and a second piston 15, the first piston 14 is movable in the first cylinder 6, the second piston 15 is movable in the second cylinder 7, a first connecting shaft 16 is provided between the first piston 14 and the second piston 15, and the second piston 15 and the first connecting shaft 16 are connected by a screw 17. The first connecting shaft 16 is movable in the inner bore of the flange 8. A third sealing ring 32 and two first sealing rings 33 are arranged between the first piston 14 and the first cylinder 6. A fourth sealing ring 34 and two second sealing rings 35 are arranged between the second piston 15 and the second cylinder 7. The first piston 14 is provided with a displacement sensor 18. The second piston 15 is provided with a buffer shaft 19. The plunger pump 2 is driven to drive the piston assembly 11 upward and to suck the liquid discharged from the hydraulic pressure chamber 13 into the plunger chamber when the piston assembly 11 is moved downward.

The oral area of compression chamber 12 is equipped with upper end cover 20, is equipped with stopper 21 on the bottom surface of upper end cover 20, and is specific, stopper 21 is spacing axle, and spacing axle sets up and is located piston assembly 11's top with piston assembly 11 is coaxial. The spacing shaft and the first cylinder 6 are sealed by a first sealing element 22.

A water jacket 23 is arranged on the outer side of the first cylinder tube 6, the first cylinder tube 6 and the water jacket 23 are sealed through two second sealing pieces 24, and a cooling liquid sealing cavity 24 is formed between the first cylinder tube 6 and the water jacket 23.

The bottom of the second cylinder 7 is sequentially connected with a connecting disc 25, an oil inlet disc 26, a buffer groove disc 27 and a base 28 from top to bottom. The buffer groove disc 27 is provided with a through hole 29 adapted to the buffer shaft 19, and the buffer groove disc 27 divides the hydraulic chamber 13 into a main hydraulic chamber 30 and a buffer hydraulic chamber 31.

Referring to fig. 3, the outlet of the main hydraulic chamber 30 is divided into two paths, one of which is connected to the driving plunger pump 2, and the other of which is connected to the high-speed switching valve 36 and the accumulator 39 in sequence. The oil ports of the buffer pressure chamber 31 are respectively connected with the inlet of the adjustable throttle valve 38 and the outlet of the second check valve 37. The outlet of the adjustable throttle valve 38 is divided into two paths, one path is connected with the driving plunger pump 2, and the other path is sequentially connected with the high-speed switch valve 36 and the energy accumulator 39. The inlet of the second one-way valve 37 is also connected with two paths, one path is connected with the driving plunger pump 2, and the other path is sequentially connected with the high-speed switch valve 36 and the energy accumulator 39.

The displacement of a single plunger of the pneumatic plunger pump 2 is larger than the volume of the hydraulic cavity 13, and the controller can receive a displacement signal transmitted by the displacement sensor 18, judge whether the piston assembly 11 is at the upper limit position or the lower limit position, and open the high-speed switch valve 36 if the piston assembly is at the upper limit position or the lower limit position.

According to the embodiment of the application, the hydraulic cavity 13 and the compression cavity 12 are separated through the piston assembly 11, pollution of hydraulic oil to compressed gas is prevented, leakage possibly existing in a hydraulic oil path and a compressor is considered, the discharge amount of the hydraulic oil in the plunger cavity is slightly larger than the maximum volume of the hydraulic oil in the hydraulic cavity 13, the displacement sensor 18 is arranged to control the high-speed switch valve 36 to be switched, and the effects of optimizing the compression stroke of the compressor, returning oil in an air inlet stage and supplementing oil to the whole hydraulic system are achieved.

Referring to fig. 1 to 3, an accumulator oil-replenishing liquid piston type compressor having a high-speed switching valve according to an embodiment of the present invention operates as follows:

in the air inlet process, the high-speed switch valve 36 is in a closed state, after the first check valve 3 of the air inlet of the booster pump is opened by pressurized air in an external air source, the piston assembly 11 is pushed to move downwards, the displacement sensor 18 collects displacement signals of the piston assembly 11 in real time and sends the displacement signals to the controller, and hydraulic oil in the hydraulic cavity 13 of the booster pump flows out of an oil port of the main hydraulic cavity 30 and then enters the driving plunger pump 2. When the piston assembly 11 reaches the lower limit position, the sensor 18 sends a signal to the controller, the controller controls the high-speed switch valve 36 to be opened, and the hydraulic oil in the energy accumulator 39 enters the driving plunger pump 2 to supplement the hydraulic oil in the driving plunger pump 2.

During air inlet, before the buffer shaft 19 enters the through hole 29 of the buffer slot disc 27, hydraulic oil flows out through the oil port of the main hydraulic cavity 30 and does not play a buffer role. After the buffer shaft 19 enters the through hole 29 of the buffer slot disc 27, the hydraulic oil in the main hydraulic cavity 30 continues to flow out from the oil port of the main hydraulic cavity 30, and the hydraulic oil in the buffer hydraulic cavity 31 forms instantaneous high pressure after being throttled by the adjustable throttle valve 38, so that the buffer function is achieved.

During the air compression process, the high-speed switch valve 36 is closed, and the energy accumulator 39 does not supplement the hydraulic oil any more. The hydraulic oil in the plunger pump 2 is directly fed into the hydraulic cavity 13 through the oil port of the main hydraulic cavity 30, or is fed into the hydraulic cavity 13 through the oil port of the buffer hydraulic cavity 31 after passing through the second check valve 37 to drive the piston assembly 11 to move upwards, until the piston assembly 11 moves upwards to the upper limit position, the controller controls the high-speed switch valve 36 to be opened, and redundant oil in the plunger of the plunger pump 2 is discharged into the energy accumulator 39. Then, the controller controls the high-speed switching valve 36 to close, and the intake process continues to be repeated. The gas compressed at each stage is introduced into the next stage for continuous compression, and the ultra-high pressure gas obtained by final compression is sent into the gas storage cylinder 4 for storage.

The above is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An accumulator oil-supplementing liquid piston compressor with a high-speed switch valve is characterized in that,

comprises a driving plunger pump, a compression unit and a controller;

the compression unit comprises a pressurization cylinder, the pressurization cylinder comprises a sealing cavity, a piston assembly is arranged in the sealing cavity, and the sealing cavity is divided into a compression cavity and a hydraulic cavity positioned at the lower part of the compression cavity by the piston assembly; a displacement sensor is arranged at one end of the piston assembly, which is positioned in the compression cavity; the oil port of the hydraulic cavity is divided into two paths, wherein one path is connected with the driving plunger pump, and the other path is sequentially connected with the high-speed switch valve and the energy accumulator; the driving plunger pump can drive the piston assembly to move towards the direction close to the compression cavity, and liquid discharged from the hydraulic cavity is sucked into the plunger pump when the piston assembly descends; the displacement of the plunger pump is larger than the volume of the hydraulic cavity;

a buffer shaft is arranged at one end, close to the hydraulic cavity, of the piston assembly, a buffer groove disc is arranged in the hydraulic cavity, a through hole matched with the buffer shaft is formed in the buffer groove disc, the buffer groove disc divides the hydraulic cavity into a main hydraulic cavity and a buffer hydraulic cavity, and an outlet of the main hydraulic cavity is connected with the driving plunger and the high-speed switch valve respectively; the outlet of the buffer hydraulic cavity is connected with the inlet of the adjustable throttling valve and the outlet of the second one-way valve; the outlet of the adjustable throttle valve is divided into two paths, one path is connected with the driving plunger pump, and the other path is sequentially connected with the high-speed switch valve and the energy accumulator; the inlet of the second one-way valve is also divided into two paths, one path is connected with the driving plunger pump, and the other path is sequentially connected with the high-speed switch valve and the energy accumulator;

the controller can receive the displacement signal transmitted by the displacement sensor and judge whether the piston assembly is at the upper limit position or the lower limit position, and if so, the high-speed switch valve is opened.

2. The accumulator oil-replenishing liquid piston compressor with the high-speed switching valve according to claim 1, characterized in that the number of the compression units is plural, the plural compression units are arranged in series, an air inlet of the compression unit at the head end is used for communicating with an air source, and an air outlet of the compression unit at the tail end is communicated with an air storage bottle.

3. The accumulator oil-replenishing liquid piston compressor with the high-speed switching valve according to claim 2, characterized in that the driving plunger pumps are multi-cylinder radial plunger pumps, the number of cylinders of the driving plunger pumps is equal to the number of the compression units, and the plungers of the driving plunger pumps correspond to the compression units one to one.

4. The accumulator oil-replenishing liquid piston compressor with the high-speed switching valve according to claim 1, characterized in that the compression unit includes a first cylinder, the piston assembly includes a first piston, the first piston is movable in the first cylinder, a water jacket is provided on an outer side of the first cylinder, and a coolant seal chamber is formed between the first cylinder and the water jacket.

5. The accumulator oil-replenishing liquid piston compressor with the high-speed switching valve according to claim 1, characterized in that an upper end cover is provided at a mouth portion of the compression chamber, a stopper is provided on a bottom surface of the upper end cover, and the stopper is provided coaxially with and above the piston assembly.

6. The accumulator oil flooded liquid piston compressor with high speed on-off valve as claimed in claim 1, wherein the piston assembly is an i-shaped piston assembly.

7. The accumulator oil flooded piston compressor with high speed on-off valve of claim 4, wherein the piston assembly further includes a first connecting shaft and a second piston, the first connecting shaft disposed between the second piston and the first piston, the second piston and the first connecting shaft connected by a screw.

8. The accumulator oil-replenishing liquid piston compressor with the high-speed switching valve according to claim 7, wherein said compression unit further comprises a second cylinder in which said second piston is movable, said second cylinder and said first cylinder being connected by a flange, said first connecting shaft being movable in an inner bore of said flange.