CN219281903U - Hydraulic drive tertiary compression cylinder - Google Patents

Abstract

The application discloses tertiary compression cylinder of hydraulic drive, wherein, first cylinder, the second cylinder, the internal diameter of third cylinder reduces in proper order, first hydro-cylinder piston, the second hydro-cylinder piston, first hydro-cylinder piston, second cylinder piston and third cylinder piston cooperate with the piston rod respectively, hydraulic system can control first hydro-cylinder piston and second hydro-cylinder piston motion respectively so that the piston rod drives first hydro-cylinder piston, second cylinder piston and third cylinder piston reciprocating motion, the gas outlet of two cavities of first cylinder is connected the air inlet of two cavities of second cylinder through the one-level cooler, the gas outlet of two cavities of second cylinder is connected the air inlet of two cavities of third cylinder through the two-level cooler, the gas outlet of two cavities of third cylinder is connected with tertiary cooler. The compression cylinder disclosed by the application has the advantages of high gas compression efficiency, large exhaust capacity, small equipment size, stable exhaust temperature, good oil-gas isolation performance and the like.

Description

Hydraulic drive tertiary compression cylinder

Technical Field

The application relates to the technical field of gas compression equipment, in particular to a hydraulic drive three-stage compression cylinder.

Background

At present, in the new energy industry, various high-purity gases are required to be in large quantities, such as air, nitrogen, oxygen, natural gas, helium, carbon dioxide, hydrogen and the like, and a large number of gas filling stations are required to provide guarantee for the wide application of the energy gases. For example, the hydrogenation station is equipment for providing high-purity hydrogen in multiple fields mainly including traffic fields, the most central equipment is a pressurizing system, the pressurizing system of many sites is a traditional diaphragm compressor which is limited by the discharge capacity of the diaphragm compressor, a plurality of compressors are needed to realize high discharge capacity and high outlet pressure, the number of compressors is large, and the running cost and the maintenance cost are relatively high, so that the emerging hydraulic driving compressor is mature to replace the traditional diaphragm compressor.

Currently, a single compression cylinder of a common gas compressor mostly adopts one-stage or two-stage compression. The compression cylinder adopts primary compression, so that the required compression ratio is very large, and the exhaust temperature is far higher than the allowable value, so that the machine cannot normally operate; when higher outlet pressure is needed, multistage gas compression is usually realized by connecting two or even a plurality of compression cylinders with different cylinder diameters in series, and the multistage compression makes the whole compression structure and the installation more complex, and the appearance of the equipment is also increased, and meanwhile, the manufacturing and later use costs of the equipment are also greatly increased. In addition, the common compression cylinder cannot completely isolate oil and gas, and if oil-gas mixing occurs, a compression medium is polluted.

Disclosure of Invention

The application provides a hydraulic drive tertiary compression cylinder to solve at least one technical problem among the above-mentioned technical problem.

The technical scheme adopted by the application is as follows:

the hydraulic driving three-stage compression cylinder comprises a first cylinder, a first cylinder piston, a second cylinder piston, a third cylinder piston, at least one piston rod, a hydraulic system, a primary cooler, a secondary cooler and a three-stage cooler, wherein the inner diameters of the first cylinder, the second cylinder and the third cylinder are sequentially reduced, the first cylinder piston is configured in a cavity of the first cylinder, the second cylinder piston is configured in a cavity of the second cylinder, the first cylinder piston, the second cylinder piston and the third cylinder piston divide the space in the first cylinder, the second cylinder and the third cylinder into two cavities, the first cylinder piston, the second cylinder piston, the first cylinder piston, the second cylinder piston and the third cylinder piston are respectively matched with the piston rod, the hydraulic system can respectively control the first cylinder piston and the second cylinder piston to move so that the piston rod drives the first cylinder piston, the second cylinder piston and the third cylinder piston to reciprocate, air outlets of two chambers of the first cylinder are connected with air inlets of two chambers of the second cylinder through the primary cooler, air outlets of two chambers of the second cylinder are connected with air inlets of two chambers of the third cylinder through the secondary cooler, and air outlets of two chambers of the third cylinder are connected with the tertiary cooler.

The hydraulic driving three-stage compression cylinder has the following additional technical characteristics:

the first cylinder, the second cylinder, the third cylinder, the first cylinder and the second cylinder are coaxially arranged, and the first cylinder, the second cylinder and the third cylinder are arranged between the first cylinder and the second cylinder.

The first oil cylinder piston divides the first oil cylinder cavity into a first hydraulic oil cavity and a first oil-gas separation cavity, and the first oil-gas separation cavity is positioned at one side of the first oil cylinder piston, which is close to the second oil cylinder; the second oil cylinder piston divides the second oil cylinder cavity into a second hydraulic oil cavity and a second oil-gas isolation cavity, the second oil-gas isolation cavity is located at one side of the second oil cylinder piston, which is close to the first oil cylinder, and the first oil-gas isolation cavity is communicated with the second oil-gas isolation cavity.

The second cylinder is isolated from the first cylinder through a first partition plate, the first partition plate separates the first oil-gas isolation cavity from the inner cavity of the second cylinder, the third cylinder is isolated from the second cylinder through a second partition plate, the second partition plate separates the second oil-gas isolation cavity from the inner cavity of the third cylinder, and the first cylinder is arranged between the second cylinder and the third cylinder.

The first cylinder is isolated from the second cylinder through a third partition plate, and the first cylinder is isolated from the third cylinder through a fourth partition plate.

The first partition plate is provided with a first oil gas leakage monitoring port communicated with the first oil gas isolation cavity, and the second partition plate is provided with a second oil gas leakage monitoring port communicated with the second oil gas isolation cavity.

The compression cylinder further comprises a first end cover for covering the first hydraulic oil cavity and a second end cover for covering the second hydraulic oil cavity, the first end cover is fixedly connected with the first oil cylinder, the first end cover is provided with a first oil inlet and outlet communicated with the first hydraulic oil cavity, the second end cover is fixedly connected with the second oil cylinder, the second end cover is provided with a second oil inlet and outlet communicated with the second hydraulic oil cavity, and the hydraulic system is respectively connected with the first oil inlet and outlet and the second oil inlet and outlet.

The compression cylinder further comprises a position sensor, wherein the position sensor is arranged on the first end cover or the second end cover and used for detecting the position of the piston rod, and the position sensor is electrically connected with the hydraulic system through an electric control unit.

And a cooling water jacket is arranged on the outer side of the first cylinder and/or the second cylinder and/or the third cylinder and/or the first oil cylinder and/or the second oil cylinder.

The first cylinder, the second cylinder, the third cylinder, the first cylinder and the second cylinder are fixed through a plurality of connecting pull rods.

Due to the adoption of the technical scheme, the technical effects obtained by the application are as follows:

1. among the tertiary compression cylinder of hydraulic drive that this application provided, first cylinder, second cylinder and third cylinder are the double-acting cylinder, and the internal diameter of first cylinder, second cylinder, third cylinder reduces in proper order, lets in the second cylinder after the first cylinder compresses gas one-level, lets in the third cylinder after the second cylinder compresses gas two-level, and the third cylinder carries out tertiary compression with gas, therefore, the compression cylinder has realized tertiary double-acting compression. In addition, the compression ratio of the compression cylinder is changed through different cylinder diameters of the cylinders, so that the installation structure of the compression cylinder is simplified, and particularly, the compression ratio is not required to be changed by changing the diameter of a piston rod, the processing technology of the piston rod is simplified, and the processing cost is reduced. In addition, in this application, first hydro-cylinder, second hydro-cylinder, first cylinder, second cylinder and third cylinder are established ties together, realize that single compression jar just has realized tertiary compression promptly, help improving compression efficiency, simplified equipment, promote equipment integrated level, reduce equipment size, reduce equipment manufacturing and use cost.

2. As a preferred mode of this application, first cylinder, second cylinder, third cylinder, first hydro-cylinder, second hydro-cylinder coaxial arrangement, and first cylinder, second cylinder and third cylinder locate between first hydro-cylinder and the second hydro-cylinder for compression cylinder atress is even, running state is stable, and each cylinder cavity synchronous operation, compressed gas's exhaust is stable, and the pipeline pulsation is little.

3. As a preferred mode of the hydraulic cylinder, on the basis that the first oil cylinder and the second oil cylinder are arranged at two ends of the compression cylinder, the first oil cylinder piston divides the first oil cylinder inner cavity into a first hydraulic oil cavity and a first oil-gas isolation cavity, the first oil-gas isolation cavity is positioned on one side of the first oil cylinder piston, the second oil cylinder piston divides the second oil cylinder inner cavity into a second hydraulic oil cavity and a second oil-gas isolation cavity, the second oil-gas isolation cavity is positioned on one side of the second oil cylinder piston close to the first oil cylinder, so that a piston rod is only subjected to oil pressure of the first hydraulic oil cavity and the second hydraulic oil cavity in the working process of the compression cylinder, the piston rod is only subjected to pressure and cannot be pulled in the moving process, and the safety of the piston rod is ensured. Moreover, the first oil-gas separation cavity and the second oil-gas separation cavity can prevent oil-gas mixture caused by leakage of hydraulic oil in the first hydraulic oil cavity and the second hydraulic oil cavity, and the compression medium is prevented from being polluted by the hydraulic oil.

4. As a preferred mode of this application, through setting up first oil gas leakage monitoring mouth and second oil gas leakage monitoring mouth, can make first oil gas isolation chamber and second oil gas isolation chamber and atmosphere intercommunication or let in little malleation protective gas to be convenient for carry out gas leakage detection or collect the hydraulic oil that leaks through the collection oil box to the compression jar through the gas flowmeter.

5. As a preferable mode of the hydraulic system reversing control device, the position of the piston rod in the compression cylinder can be detected in real time by arranging the position sensor, so that the reversing control of the hydraulic system is realized, and the reliable operation of the hydraulic system is ensured.

6. As a preferred mode of this application, through set up cooling jacket in first hydro-cylinder, second hydro-cylinder, first cylinder, second cylinder and third cylinder outside, guarantee compressed gas's temperature, help improving compression efficiency, also can in time discharge the heat of cylinder liner, avoid sealed overheated and the life-span decline problem that appears.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:

FIG. 1 is a schematic diagram of a hydraulic drive three stage compression cylinder provided herein;

FIG. 2 is a cross-sectional view at A-A in FIG. 1;

FIG. 3 is a cross-sectional view at A-A in FIG. 1;

FIG. 4 is a schematic diagram of the path of gas compression as the piston rod moves to the right;

fig. 5 is a schematic diagram of the path of the gas compression when the piston rod moves to the left.

Reference numerals:

11 first cylinder, 111 first hydraulic oil chamber, 112 first oil-gas separation chamber, 12 second cylinder, 121 second hydraulic oil chamber, 122 second oil-gas separation chamber, 13 first cylinder, 131 first left compression chamber, 132 first right compression chamber, 14 second cylinder, 141 second left compression chamber, 142 second right compression chamber, 15 third cylinder, 151 third left compression chamber, 152 third right compression chamber;

21 first cylinder piston, 22 second cylinder piston, 23 first cylinder piston, 24 second cylinder piston, 25 third cylinder piston, 26 piston rod;

a primary cooler 31, a secondary cooler 32, and a tertiary cooler 33;

41 first partition, 411 first oil gas leakage monitoring port, 42 second partition, 421 second oil gas leakage monitoring port, 43 third partition, 44 fourth partition;

51 first end cap, 511 first oil inlet, 52 second end cap, 521 second oil inlet;

6, a position sensor;

71 a first cooling water jacket, 72 a second cooling water jacket, 73 a third cooling water jacket, 74 a fourth cooling water jacket, 75 a fifth cooling water jacket;

81 connecting pull rod, 82 locking nut;

91 total inlet, 92 total outlet.

Detailed Description

In order to more clearly illustrate the general concepts of the present application, a detailed description is provided below by way of example in connection with the accompanying drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced otherwise than as described herein, and thus the scope of the present application is not limited by the specific embodiments disclosed below.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In the embodiments of the present application, a three-stage hydraulic drive cylinder is provided, and for convenience of explanation and understanding, the following description is provided based on the structure of the illustrated product. Of course, those skilled in the art will appreciate that the foregoing structure is merely exemplary and illustrative and is not to be construed as limiting the scope of the embodiments provided herein.

As shown in fig. 1 to 5, the hydraulic driving three-stage compression cylinder provided by the application comprises a first cylinder 11, a first cylinder piston 21, a second cylinder 12, a second cylinder piston 22, a first cylinder 13, a first cylinder piston 23, a second cylinder 14, a second cylinder piston 24, a third cylinder 15, a third cylinder piston 25, at least one piston rod 26, a hydraulic system, a primary cooler 31, a secondary cooler 32 and a three-stage cooler 33, wherein the inner diameters of the first cylinder 13, the second cylinder 14 and the third cylinder 15 are sequentially reduced, the first cylinder piston 21 is configured in a cavity of the first cylinder 11, the second cylinder piston 22 is configured in a cavity of the second cylinder 12, the first cylinder piston 23, the second cylinder piston 24 and the third cylinder piston 25 divide the space in the first cylinder 13, the second cylinder 14 and the third cylinder 15 into two chambers respectively, the first cylinder piston 21, the second cylinder piston 22, the second cylinder piston 24 and the third cylinder piston 25 are respectively connected with the first cylinder piston 14 and the second cylinder piston 14 through the first cylinder piston 24 and the second cylinder piston 25, the second cylinder piston 21 and the second cylinder piston 25 are respectively controlled to reciprocate in the two chambers, the two chambers are respectively connected with the first cylinder piston 14 and the second cylinder piston 25 and the third cylinder piston 25 through the two chambers and the air inlet 14 and the second cylinder piston 14 and the two chambers respectively, the air outlets of the two chambers of the third air cylinder 15 are connected with the tertiary cooler 33.

Specifically, the first cylinder piston 23, the second cylinder piston 24, and the third cylinder piston 25 divide the space in the first cylinder 13, the second cylinder 14, and the third cylinder 15 into two chambers, respectively, so that the first cylinder 13, the second cylinder 14, and the third cylinder 15 are double-acting cylinders. The inner diameters of the first cylinder 13, the second cylinder 14 and the third cylinder 15 are sequentially reduced, the air outlets of the two chambers of the first cylinder 13 are connected with the air inlets of the two chambers of the second cylinder 14 through the primary cooler 31, the air outlets of the two chambers of the second cylinder 14 are connected with the air inlets of the two chambers of the third cylinder 15 through the secondary cooler 32, in the process that the piston rod 26 drives the first cylinder piston 23, the second cylinder piston 24 and the third cylinder piston 25 to reciprocate, the first cylinder 13 compresses the air in one stage and then leads the air to the second cylinder 14, the second cylinder 14 compresses the air in two stages and leads the air to the third cylinder 15, and the third cylinder 15 compresses the air in three stages and then leads the air to be discharged outside, so that the compression cylinder can realize three-stage double-acting compression. In addition, the primary cooler 31, the secondary cooler 32, and the tertiary cooler 33 can ensure that the temperature of the gas does not excessively rise during the compression process, and the safety of the apparatus. In this application, first hydro-cylinder 11, second hydro-cylinder 12, first cylinder 13, second cylinder 14 and third cylinder 15 are in series connection together, realize that single compression jar just has realized tertiary compression promptly, help improving compression efficiency, simplified equipment, promote equipment integrated level, reduce equipment size, reduce equipment manufacturing and use cost.

The number of the piston rods is not limited in the present application, and the compression cylinder may include one piston rod or a plurality of piston rods. Taking a piston rod as an example, namely a long rod with the piston rod being integrally formed, all pistons are connected with the long rod. And a plurality of piston rods are taken as an example, so that one piston rod is arranged between two adjacent pistons, and the plurality of piston rods participate in cooperation, so that the technical problems of very high processing difficulty and heat treatment difficulty when the piston rod is a long rod can be solved. In specific implementation, the first cylinder piston 21, the second cylinder piston 22, the first cylinder piston 23, the second cylinder piston 24, the third cylinder piston 25 and the piston rod 26 may be connected by screw threads, or may be connected by semi-rings or other forms of fixed connection, or of course, the linkage between each piston and the piston rod may be realized only by limit fit, and a plurality of piston rods are taken as an example, so that one piston rod is clamped between two adjacent pistons respectively, and only a limit structure for limiting radial movement of the piston rod needs to be arranged on the piston to ensure coaxiality of the piston rod and the piston. The first cylinder piston 21, the second cylinder piston 22, the first cylinder piston 23, the second cylinder piston 24 and the third cylinder piston 25 can be sealed with the first cylinder 11, the second cylinder 12, the first cylinder 13, the second cylinder 14 and the third cylinder 15 respectively by using a pan plug seal, a Style seal or other types of seals. In addition, the compression ratio of the first stage compression may be set by the volume ratio of the compression chambers of the first cylinder 13 and the second cylinder 14, the compression ratio of the second stage compression may be set by the volume ratio of the compression chambers of the second cylinder 14 and the third cylinder 15, and the compression ratio of the third stage compression is determined by the compression ratio of the first stage compression, the compression ratio of the second stage compression, and the total compression ratio between the intake end and the exhaust end of the compression cylinder.

As a preferred embodiment of the present application, as shown in fig. 2, the first cylinder 13, the second cylinder 14, the third cylinder 15, the first cylinder 11, and the second cylinder 12 may be coaxially arranged, and the first cylinder 13, the second cylinder 14, and the third cylinder 15 may be disposed between the first cylinder 11 and the second cylinder 12.

It can be understood by those skilled in the art that the first cylinder 13, the second cylinder 14, the third cylinder 15, the first cylinder 11 and the second cylinder 12 are coaxially arranged, so that the piston rod 26 is arranged on the central axes of the first cylinder 13, the second cylinder 14, the third cylinder 15, the first cylinder 11 and the second cylinder 12, the reliable and smooth movement of the piston rod 26 in the compression cylinder is ensured, the coaxial connection of the piston rod 26 and each piston is also ensured, the eccentric connection is avoided, the compression cylinder is uniformly stressed as a whole, the running state is stable, the chambers of each cylinder synchronously run, the exhaust of compressed gas is stable, and the pulsation of a pipeline is small.

It should be noted that, the positions of the first cylinder 13, the second cylinder 14, and the third cylinder 15 between the first cylinder 11 and the second cylinder 12 are not limited in this application, that is, the positions of the first cylinder 13, the second cylinder 14, and the third cylinder 15 between the first cylinder 11 and the second cylinder 12 may be changed arbitrarily. For example, as shown in fig. 2, the present application schematically illustrates an embodiment in which the second cylinder 14 is connected to the first cylinder 11, the third cylinder 15 is connected to the second cylinder 12, and the first cylinder 13 is disposed between the second cylinder 14 and the third cylinder 15.

Further, as shown in fig. 2 and 3, the first cylinder piston 21 may be made to divide the cavity of the first cylinder 11 into a first hydraulic oil cavity 111 and a first oil-gas isolation cavity 112, where the first oil-gas isolation cavity 112 is located at a side of the first cylinder piston 21 close to the second cylinder 12; the second cylinder piston 22 divides the cavity of the second cylinder 12 into a second hydraulic oil cavity 121 and a second oil-gas isolation cavity 122, the second oil-gas isolation cavity 122 is located at one side of the second cylinder piston 22 close to the first cylinder 11, and the first oil-gas isolation cavity is communicated with the second oil-gas isolation cavity.

As will be appreciated by those skilled in the art, on the basis that the first cylinder 11 and the second cylinder 12 are disposed at both ends of the compression cylinder, the first cylinder piston 21 divides the inner chamber of the first cylinder 11 into the first hydraulic oil chamber 111 and the first oil-gas separation chamber 112, the first oil-gas separation chamber 112 is located at one side of the first cylinder piston 21 close to the second cylinder 12, the second cylinder piston 22 divides the inner chamber of the second cylinder 12 into the second hydraulic oil chamber 121 and the second oil-gas separation chamber 122, the second oil-gas separation chamber 122 is located at one side of the second cylinder piston 22 close to the first cylinder 11, when the hydraulic system injects hydraulic oil into the first hydraulic oil chamber 111, the piston rod 26 is pressed toward the second hydraulic oil chamber 121 and extrudes hydraulic oil in the second hydraulic oil chamber 121, and when the hydraulic system injects hydraulic oil into the second hydraulic oil chamber 121, the piston rod 26 is pressed toward the first hydraulic oil chamber 111 and extrudes hydraulic oil in the first hydraulic oil chamber 111, so that the piston rod 26 is only pressed by the first hydraulic oil chamber 111 and the second hydraulic oil chamber 121, so that during the movement, the piston rod 26 is only pressed by the second hydraulic oil chamber 121 and does not receive tension, and safety of the piston rod 26 is ensured. Moreover, taking the embodiment in which the second cylinder 14 is connected to the first cylinder 11, the third cylinder 15 is connected to the second cylinder 12, and the first cylinder 13 is disposed between the second cylinder 14 and the third cylinder 15 as an example, the first oil-gas separation chamber 112 separates the first cylinder 11 from the second cylinder 14, and the second oil-gas separation chamber 122 separates the second cylinder 12 from the third cylinder 15, it is possible to prevent the oil from mixing due to leakage of hydraulic oil in the first hydraulic oil chamber 111 and the second hydraulic oil chamber 121, and the oil and gas from being completely separated, thereby avoiding pollution of the compression medium by the hydraulic oil. In the process of reciprocating the piston rod 26, the first oil-gas separation cavity 112 is communicated with the second oil-gas separation cavity 122, so that the stability and consistency of the air pressure inside each of the first oil-gas separation cavity 112 and the second oil-gas separation cavity 122 are ensured, and in specific implementation, the first oil-gas separation cavity 112 and the second oil-gas separation cavity 122 can be communicated through pipelines.

Further, as shown in fig. 2 and 3, the second cylinder 14 is isolated from the first cylinder 11 by a first partition 41, the first partition 41 separates the first oil-gas isolating cavity 112 from the inner cavity of the second cylinder 14, the third cylinder 15 is isolated from the second cylinder 12 by a second partition 42, the second partition 42 separates the second oil-gas isolating cavity 122 from the inner cavity of the third cylinder 15, and the first cylinder 13 is disposed between the second cylinder 14 and the third cylinder 15. Because the piston rod 26 needs to pass through the first partition 41 and the second partition 42, a pan plug seal, a stell seal or other sealing methods can be adopted between the piston rod 26 and the first partition 41 and the second partition 42 to ensure the sealing effect.

As a preferred example, as shown in fig. 2 and 3, the first cylinder 13 and the second cylinder 14 are isolated by a third partition 43, and the first cylinder 13 and the third cylinder 15 are isolated by a fourth partition 44. Because the piston rod 26 needs to pass through the third partition plate 43 and the fourth partition plate 44, a pan plug seal, a stoner seal or other types of seals can be adopted between the piston rod 26 and the third partition plate 43 and the fourth partition plate 44 to ensure the sealing effect. In addition, the seal between the cylinder and the partition plate and the seal between the cylinder and the partition plate can be an outer surface seal or an inner surface seal.

In order to detect whether there is a hydrocarbon leakage, it is preferable that the first partition 41 is provided with a first hydrocarbon leakage monitoring port 411 communicating with the first hydrocarbon isolation chamber 112, and the second partition 42 is provided with a second hydrocarbon leakage monitoring port 421 communicating with the second hydrocarbon isolation chamber 122, as shown in fig. 3. Through setting up first oil gas leakage monitoring mouth 411 and second oil gas leakage monitoring mouth 421, can make first oil gas isolation chamber 112 and second oil gas isolation chamber 122 and atmosphere intercommunication or let in micro positive pressure protective gas (such as nitrogen gas) to carry out gas leakage detection or collect the hydraulic oil that leaks through the collection oil box to the compression jar through the gas flowmeter. When the hydraulic oil leaks into the first oil-gas separation cavity 112 and the second oil-gas separation cavity 122, the leaked hydraulic oil can flow into the oil collecting box through the first oil-gas leakage monitoring port 411 and the second oil-gas leakage monitoring port 421, and when the compressed gas leaks into the first oil-gas separation cavity 112 and the second oil-gas separation cavity 122, the leaked compressed gas can flow into the gas flowmeter through the first oil-gas leakage monitoring port 411 and the second oil-gas leakage monitoring port 421 for detection.

As a preferred example, as shown in fig. 2 and 3, the compression cylinder further includes a first end cap 51 for covering the first hydraulic oil chamber 111 and a second end cap 52 for covering the second hydraulic oil chamber 121, the first end cap 51 is fixedly connected to the first cylinder 11, the first end cap 51 is provided with a first oil inlet/outlet 511 communicating with the first hydraulic oil chamber 111, the second end cap 52 is fixedly connected to the second cylinder 12, the second end cap 52 is provided with a second oil inlet/outlet 521 communicating with the second hydraulic oil chamber 121, and the hydraulic system is respectively connected to the first oil inlet/outlet 511 and the second oil inlet/outlet 521. Specifically, the first and second end caps 51 and 52 cover the first and second hydraulic oil chambers 111 and 121, respectively, to avoid hydraulic oil escaping and leaking. The static seal between the first end cap 51 and the first ram 11 and the static seal between the second end cap 52 and the second ram 12 may be external surface seals or internal surface seals.

Further, as shown in fig. 1 and 2, the compression cylinder further includes a position sensor 6, where the position sensor 6 is disposed on the first end cover 51 or the second end cover 52 for detecting the position of the piston rod 26, and the position sensor 6 is electrically connected to the hydraulic system through an electronic control unit. The present application schematically illustrates an embodiment in which the position sensor 6 is provided on the first end cap 51, where the position sensor 6 can detect the position of the piston rod 26 in the compression cylinder in real time and transmit the position signal of the piston rod 26 to the electronic control unit, which controls the reversing of the hydraulic system, so as to ensure the reliable operation of the hydraulic system.

As a preferred embodiment of the present application, a cooling water jacket may be provided on the outer side of the first cylinder 13 and/or the second cylinder 14 and/or the third cylinder 15 and/or the first cylinder 11 and/or the second cylinder 12. In other words, a cooling water jacket may be provided outside at least one of the first cylinder 13, the second cylinder 14, the third cylinder 15, the first cylinder 11, and the second cylinder 12. More preferably, as shown in fig. 2, the first cylinder 11, the second cylinder 12, the first cylinder 13, the second cylinder 14, and the third cylinder 15 may be provided with a first cooling water jacket 71, a second cooling water jacket 72, a third cooling water jacket 73, a fourth cooling water jacket 74, and a fifth cooling water jacket 75, respectively, on the outer sides thereof. The cooling water jacket ensures the temperature of compressed gas, is beneficial to improving the compression efficiency, can timely discharge the heat of the cylinder sleeve, and avoids the problem of service life reduction caused by sealing overheat.

As a preferred embodiment of the present application, as shown in fig. 1 and 2, the first cylinder 13, the second cylinder 14, the third cylinder 15, the first cylinder 11, and the second cylinder 12 may be fixed by a plurality of connecting rods 81. Specifically, as shown in fig. 1 and 2, on the basis that the aforementioned compression cylinder further includes a first end cap 51 for covering the first hydraulic oil chamber 111 and a second end cap 52 for covering the second hydraulic oil chamber 121, both ends of the connecting rod 81 can be fixed with the first end cap 51 and the second end cap 52 by the lock nuts 82 to tightly press all cylinders, and partition plates in the middle together, which is convenient and inexpensive to install. The number of the connecting links 81 is not limited in this application, and may be 4, 6, 8, or the like.

For ease of understanding, as shown in fig. 2 and 3, the two chambers of the first cylinder 13 separated by the first cylinder piston 23 may be illustrated as a first left compression chamber 131 and a first right compression chamber 132, the two chambers of the second cylinder 14 separated by the second cylinder piston 24 are illustrated as a second left compression chamber 141 and a second right compression chamber 142, and the two chambers of the third cylinder 15 separated by the third cylinder piston 25 are illustrated as a third left compression chamber 151 and a third right compression chamber 152. The working mode of the hydraulic driving three-stage compression cylinder of the present application is described below with reference to the accompanying drawings:

(1) As shown in fig. 2 to 4, when the hydraulic system controls the oil to be filled into the first hydraulic oil chamber 111 through the first oil inlet/outlet port 511, the oil in the second hydraulic oil chamber 121 is returned to the return line of the hydraulic system through the second oil inlet/outlet port 521. When the hydraulic oil pressure is large enough, the first cylinder piston 21 is pushed to move rightwards, and the first cylinder piston 23, the piston rod 26, the second cylinder piston 24, the third cylinder piston 25 and the second cylinder piston 22 are synchronously driven to move rightwards, so that the gas in the first right compression cavity 132, the second right compression cavity 142 and the third right compression cavity 152 is compressed, and the gas pressure in the first left compression cavity 131, the second left compression cavity 141 and the third left compression cavity 151 is reduced. At this time, when the air pressure in the first right compression chamber 132 is greater than the air pressure in the first stage cooler 31 and the air pressure in the first stage cooler 31 is greater than the air pressure in the second left compression chamber 141, the compressed air in the first right compression chamber 132 enters the second left compression chamber 141 through the check valve and the first stage cooler 31; meanwhile, when the air pressure in the second right compression chamber 142 is greater than the air pressure in the second cooler 32 and the air pressure in the second cooler 32 is greater than the air pressure in the third left compression chamber 151, the compressed air in the second right compression chamber 142 enters the third left compression chamber 151 through the check valve and the second cooler 32; meanwhile, when the air pressure in the third right compression chamber 152 is greater than the air pressure in the three-stage cooler 33, the air in the third right compression chamber 152 is cooled by the three-stage cooler 33 and then discharged through the total exhaust port 92; at the same time, the air supply supplements air to the first left compression chamber 131 through the total air intake 91. The position sensor 6 monitors the position of the piston rod 26 in real time during the rightward movement of the first cylinder piston 21, the first cylinder piston 23, the piston rod 26, the second cylinder piston 24, the third cylinder piston 25 and the second cylinder piston 22, and when the gap between the second cylinder piston 22 and the second end cover 52 reaches the minimum value set by the control system, the electronic control unit gives a reversing signal, and the hydraulic system does not fill the first hydraulic oil chamber 111 but fills the second hydraulic oil chamber 121.

(2) As shown in fig. 2, 3 and 5, when the hydraulic system controls the hydraulic oil to be filled into the second hydraulic oil chamber 121 through the second oil inlet/outlet port 521, the hydraulic oil in the first hydraulic oil chamber 111 is returned to the hydraulic system return line through the first oil inlet/outlet port 511 at the same time. When the hydraulic oil pressure is large enough, the second cylinder piston 22 is pushed to move leftwards, and the first cylinder piston 23, the piston rod 26, the second cylinder piston 24, the third cylinder piston 25 and the first cylinder piston 21 are synchronously driven to move leftwards, so that the gas in the first left compression cavity 131, the second left compression cavity 141 and the third left compression cavity 151 is compressed, and the gas pressure in the first right compression cavity 132, the second right compression cavity 142 and the third right compression cavity 152 is reduced. At this time, when the air pressure in the first left compression chamber 131 is greater than the air pressure in the first stage cooler 31 and the air pressure in the first stage cooler 31 is greater than the air pressure in the second right compression chamber 142, the compressed air in the first left compression chamber 131 enters the second right compression chamber 142 through the check valve and the first stage cooler 31; meanwhile, when the air pressure in the second left compression chamber 141 is greater than the air pressure in the second stage cooler 32 and the air pressure in the second stage cooler 32 is greater than the air pressure in the third right compression chamber 152, the compressed air in the second left compression chamber 141 enters the third right compression chamber 152 through the check valve and the second stage cooler 32; meanwhile, when the air pressure in the third left compression chamber 151 is greater than the air pressure in the three-stage cooler 33, the air in the third left compression chamber 151 is cooled by the three-stage cooler 33 and then discharged through the total exhaust port 92; at the same time, the air supply supplements air to the first right compression chamber 132 via the total air intake 91. The position sensor 6 monitors the position of the piston rod 26 in real time during the leftward movement of the first cylinder piston 21, the first cylinder piston 23, the piston rod 26, the second cylinder piston 24, the third cylinder piston 25 and the second cylinder piston 22, and when the gap between the first cylinder piston 21 and the first end cap 51 reaches the minimum value set by the control system, the electronic control unit gives a reversing signal, and the hydraulic system does not fill the second hydraulic oil chamber 121 but fills the first hydraulic oil chamber 111.

The non-mentioned places in the application can be realized by adopting or referring to the prior art.

In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments.

The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.

Claims (10)

1. The hydraulic driving three-stage compression cylinder is characterized by comprising a first cylinder, a first cylinder piston, a second cylinder piston, a third cylinder piston, at least one piston rod, a hydraulic system, a primary cooler, a secondary cooler and a three-stage cooler, wherein the inner diameters of the first cylinder, the second cylinder and the third cylinder are sequentially reduced, the first cylinder piston is arranged in a cavity of the first cylinder, the second cylinder piston is arranged in a cavity of the second cylinder, the first cylinder piston, the second cylinder piston and the third cylinder piston divide the space in the first cylinder, the second cylinder and the third cylinder into two cavities, the first cylinder piston, the second cylinder piston, the first cylinder piston, the second cylinder piston and the third cylinder piston are respectively matched with the piston rod, the hydraulic system can respectively control the first cylinder piston and the second cylinder piston to move so that the piston rod drives the first cylinder piston, the second cylinder piston and the third cylinder piston to reciprocate, air outlets of two chambers of the first cylinder are connected with air inlets of two chambers of the second cylinder through the primary cooler, air outlets of two chambers of the second cylinder are connected with air inlets of two chambers of the third cylinder through the secondary cooler, and air outlets of two chambers of the third cylinder are connected with the tertiary cooler.

2. The hydraulically driven three stage compression cylinder of claim 1, wherein the first cylinder, the second cylinder, the third cylinder, the first cylinder, the second cylinder are coaxially arranged, the first cylinder, the second cylinder, and the third cylinder are disposed between the first cylinder and the second cylinder.

3. The hydraulically driven three stage compression cylinder of claim 2, wherein the first cylinder piston separates the first cylinder chamber into a first hydraulic oil chamber and a first oil and gas isolation chamber, the first oil and gas isolation chamber being located on a side of the first cylinder piston that is proximate to the second cylinder; the second oil cylinder piston divides the second oil cylinder cavity into a second hydraulic oil cavity and a second oil-gas isolation cavity, the second oil-gas isolation cavity is located at one side of the second oil cylinder piston, which is close to the first oil cylinder, and the first oil-gas isolation cavity is communicated with the second oil-gas isolation cavity.

4. The hydraulically driven three stage compression cylinder of claim 3, wherein the second cylinder is isolated from the first cylinder by a first partition separating the first oil and gas isolation chamber from the interior chamber of the second cylinder, and the third cylinder is isolated from the second cylinder by a second partition separating the second oil and gas isolation chamber from the interior chamber of the third cylinder, the first cylinder being disposed between the second cylinder and the third cylinder.

5. The hydraulically driven three stage compression cylinder of claim 4, wherein the first cylinder is isolated from the second cylinder by a third partition and the first cylinder is isolated from the third cylinder by a fourth partition.

6. The hydraulically driven three stage compression cylinder of claim 4, wherein the first partition is provided with a first oil and gas leakage monitoring port in communication with the first oil and gas isolation chamber and the second partition is provided with a second oil and gas leakage monitoring port in communication with the second oil and gas isolation chamber.

7. The hydraulically driven three stage compression cylinder of claim 3, further comprising a first end cap for closing the first hydraulic oil chamber and a second end cap for closing the second hydraulic oil chamber, the first end cap being fixedly connected to the first cylinder, the first end cap being provided with a first oil inlet and outlet communicating with the first hydraulic oil chamber, the second end cap being fixedly connected to the second cylinder, the second end cap being provided with a second oil inlet and outlet communicating with the second hydraulic oil chamber, the hydraulic system being connected to the first oil inlet and outlet and the second oil inlet and outlet, respectively.

8. The hydraulically driven three stage compression cylinder of claim 7, further comprising a position sensor on either the first end cap or the second end cap for detecting the position of the piston rod, the position sensor being electrically connected to the hydraulic system via an electronic control unit.

9. The hydraulically driven three stage compression cylinder of any one of claims 1 to 8, wherein a cooling water jacket is provided outside the first cylinder and/or the second cylinder and/or the third cylinder and/or the first cylinder and/or the second cylinder.

10. The hydraulically driven three stage compression cylinder of any one of claims 1 to 8, wherein the first cylinder, the second cylinder, the third cylinder, the first cylinder and the second cylinder are fixed by a plurality of connecting ties.

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