CN217813793U - Gas multi-stage compression device - Google Patents

Abstract

The utility model discloses a gas multistage compression device, which comprises a hydraulic cylinder and a gas compression cylinder, wherein the gas compression cylinder comprises a low pressure cylinder, a middle pressure cylinder and a high pressure cylinder; the hydraulic cylinder and the gas compression cylinder are coaxially arranged, and the left end hydraulic cylinder, the low pressure cylinder, the high pressure cylinder, the middle pressure cylinder and the right end hydraulic cylinder are sequentially arranged from left to right; the left end pneumatic cylinder links to each other through first connecting seat with the low pressure jar, and low pressure jar and high-pressure jar link to each other through the second connecting seat, and high-pressure jar and intermediate pressure jar link to each other through the third connecting seat, and intermediate pressure jar and right-hand member pneumatic cylinder link to each other through the fourth connecting seat. The device has long service life and stable and safe operation; three-stage compression is continuously carried out, the compression efficiency is high, the pressure is high, and the method is particularly suitable for hydrogen compression.

Description

Gas multi-stage compression device

Technical Field

The utility model relates to a compressed gas's device, concretely relates to can carry out multistage compressed device to gas.

Background

The gas multi-stage compression device is widely used for compressing gases such as natural gas, hydrogen and the like, and the currently used multi-stage gas compressor is characterized in that a plurality of coaxially arranged compression cylinders are connected into a whole for use, no matter an oil cylinder piston or a compression cylinder piston is fixedly connected with a piston rod in a threaded connection mode, a double-acting oil cylinder is generally adopted, and the reciprocating motion of the oil cylinder drives the piston of the compression cylinder to reciprocate to realize the compression of the gas. In the working process of the multistage gas compressor, the piston is alternately subjected to the pulling force and the pressure of the piston rod, so that the connection failure between the piston rod and the piston or the breakage of the piston rod is easily caused after a long time; in addition, because the number of the parts needing to be connected is large, especially, a plurality of pistons form a moving whole in a screw connection mode with the piston rod, the coaxiality of the moving whole is difficult to guarantee, the coaxiality requirement of the cylinder body, the piston rod and the pistons is high, the machining precision is high, the assembly difficulty is high, and therefore the manufacturing cost and the using cost are increased.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to provide a gaseous multistage compression device, can effectively avoid being connected of piston rod and piston to become invalid, can effectively reduce the machining precision and assemble the degree of difficulty.

In order to solve the technical problem, the utility model provides a gaseous multistage compression device with following structure, including pneumatic cylinder and gas compression jar, its structural feature lies in: the hydraulic cylinder comprises a left end hydraulic cylinder and a right end hydraulic cylinder, and the gas compression cylinder comprises a low pressure cylinder, a middle pressure cylinder and a high pressure cylinder; the hydraulic cylinder and the gas compression cylinder are coaxially arranged, and the left end hydraulic cylinder, the low pressure cylinder, the high pressure cylinder, the middle pressure cylinder and the right end hydraulic cylinder are sequentially arranged from left to right; the left hydraulic cylinder and the low pressure cylinder are connected through a first connecting seat, the low pressure cylinder and the high pressure cylinder are connected through a second connecting seat, the high pressure cylinder and the middle pressure cylinder are connected through a third connecting seat, and the middle pressure cylinder and the right hydraulic cylinder are connected through a fourth connecting seat; a left hydraulic piston is arranged in the left end hydraulic cylinder, a right hydraulic piston is arranged in the right end hydraulic cylinder, the left end of a first piston rod passes through the first connecting seat and abuts against the left hydraulic piston, the right end of the first piston rod is positioned in the low pressure cylinder, and a low pressure piston which is integrally formed with the first piston rod and is positioned in the low pressure cylinder is arranged on the first piston rod; the right end of the third piston rod abuts against the right hydraulic piston after penetrating through the fourth connecting seat, the left end of the third piston rod is positioned in the middle pressure cylinder, and the third piston rod is provided with a middle pressure piston which is integrally formed with the third piston rod and is positioned in the middle pressure cylinder; the left end of the second piston rod penetrates through the second connecting seat and then is connected with the first piston rod, the right end of the second piston rod penetrates through the third connecting seat and then is connected with the third piston rod, and the second piston rod is provided with a high-pressure piston which is integrally formed with the second piston rod and is positioned in the high-pressure cylinder; the upper part of the first connecting seat is provided with an emptying hole communicated with the right end of the inner cavity of the left-end hydraulic cylinder, and the upper part of the fourth connecting seat is provided with an emptying hole communicated with the left end of the inner cavity of the right-end hydraulic cylinder; the upper part and the lower part of the first connecting seat are respectively provided with a primary air outlet hole and a primary air inlet hole which are communicated with the left end of the inner cavity of the low pressure cylinder, the upper part of the second connecting seat is provided with a primary air outlet hole which is communicated with the right end of the inner cavity of the low pressure cylinder and a tertiary air outlet hole which is communicated with the left end of the inner cavity of the high pressure cylinder, and the lower part of the second connecting seat is provided with a primary air inlet hole which is communicated with the right end of the inner cavity of the low pressure cylinder and a tertiary air inlet hole which is communicated with the left end of the inner cavity of the high pressure cylinder; the upper part of the third connecting seat is provided with a third-stage air outlet communicated with the right end of the inner cavity of the high-pressure cylinder and a second-stage air outlet communicated with the left end of the inner cavity of the intermediate-pressure cylinder, and the lower part of the third connecting seat is provided with a third-stage air inlet communicated with the right end of the inner cavity of the high-pressure cylinder and a second-stage air inlet communicated with the left end of the inner cavity of the intermediate-pressure cylinder; the upper part of the fourth connecting seat is provided with a second-stage air outlet communicated with the right end of the inner cavity of the intermediate pressure cylinder, and the lower part of the fourth connecting seat is provided with a second-stage air inlet communicated with the right end of the inner cavity of the intermediate pressure cylinder; the air outlet hole and the air inlet hole are connected with one-way valves or the air outlet hole and the air inlet hole are internally provided with one-way valves, the primary air outlet hole is communicated with the secondary air inlet hole, the secondary air outlet hole is communicated with the tertiary air inlet hole, the left end of the left-end hydraulic cylinder is provided with a liquid inlet hole, and the right end of the right-end hydraulic cylinder is provided with a liquid inlet hole; and a sealing mechanism is arranged between the piston rod and the corresponding connecting seat.

The left hydraulic piston is provided with a left inserting counter bore, the left end face of the first piston rod abuts against the bottom face of the left inserting counter bore, and the first piston rod is in clearance fit with the left inserting counter bore; the right hydraulic piston is provided with a right inserting counter bore, the right end face of the third piston rod abuts against the bottom face of the right inserting counter bore, and the third piston rod is in clearance fit with the right inserting counter bore.

The sealing mechanism comprises a first piston rod sealing mechanism, a second piston rod sealing mechanism and a third piston rod sealing mechanism.

The first piston rod sealing mechanism comprises a first connecting seat, the first connecting seat is of a two-body structure consisting of an inner seat body and an outer seat body, a ring groove is arranged on the hole wall of the piston rod penetrating hole of the outer seat body, and an outer seat body sealing ring which is in sealing fit with the first piston rod is arranged in the ring groove; the piston rod penetrating hole of the inner seat body is a step hole and is called a seat body step hole, the small hole of the seat body step hole is used for penetrating and installing the piston rod, at least two ring discs are arranged in the large hole of the seat body step hole, the sum of the thicknesses of the ring discs is the same as the depth of the large hole of the seat body step hole, the ring discs are provided with step holes and are called disk body step holes, and the small hole of the disk body step hole is used for penetrating and installing the piston rod; the large holes of the stepped holes of the disc bodies of the innermost ring discs and the steps of the stepped holes of the seat bodies enclose an inner seat body sealing ring groove, the large holes of the stepped holes of the disc bodies of the other ring discs and the end surface of the inner side ring disc adjacent to the ring disc enclose an inner seat body sealing ring groove, and an inner seat body sealing ring which is in sealing fit with the first piston rod is arranged in the inner seat body sealing ring groove.

And the outer seat body is provided with an exhaust hole positioned between the inner seat body sealing ring and the outer seat body sealing ring.

The second piston rod sealing mechanism comprises a second connecting seat and a third connecting seat, and the second connecting seat and the third connecting seat are of a two-body structure consisting of an inner seat body and an outer seat body; the piston rod through holes of the inner seat body and the outer seat body are stepped holes which are respectively called as an inner seat body stepped hole and an outer seat body stepped hole, and the small holes of the inner seat body stepped hole and the outer seat body stepped hole are used for through mounting the piston rod; an inner ring disc is arranged in a large hole of the inner seat body step hole, the inner ring disc is provided with a step hole and is called an inner disc body step hole, an outer ring disc is arranged in a large hole of the outer seat body step hole, the outer ring disc is provided with a step hole and is called an outer disc body step hole, and the inner disc body step hole and a small hole of the outer disc body step hole are used for being penetrated with a piston rod; the large hole of the inner disc body step hole and the step of the inner base body step hole enclose an inner sealing groove, and the large hole of the outer disc body step hole and the step of the outer base body step hole enclose an outer sealing groove; sealing rings which are in sealing fit with the second piston rod are arranged in the inner sealing groove and the outer sealing groove; the sum of the depths of the large holes of the outer seat body stepped holes and the large holes of the inner seat body stepped holes is the same as the sum of the thicknesses of the inner ring disc and the outer ring disc.

The third piston rod sealing mechanism comprises a fourth connecting seat, the fourth connecting seat is of a two-body structure consisting of an inner seat body and an outer seat body, a ring groove is arranged on the hole wall of the piston rod penetrating hole of the outer seat body, and an outer seat body sealing ring which is in sealing fit with the third piston rod is arranged in the ring groove; the piston rod penetrating hole of the inner seat body is a step hole and is called a seat body step hole, the small hole of the seat body step hole is used for penetrating and installing the piston rod, at least two ring discs are arranged in the large hole of the seat body step hole, the sum of the thicknesses of the ring discs is the same as the depth of the large hole of the seat body step hole, the ring discs are provided with step holes and are called disk body step holes, and the small hole of the disk body step hole is used for penetrating and installing the piston rod; the large holes of the stepped holes of the disc bodies of the innermost ring discs and the steps of the stepped holes of the seat bodies enclose an inner seat body sealing ring groove, the large holes of the stepped holes of the disc bodies of the other ring discs and the end surface of the inner side ring disc adjacent to the ring disc enclose an inner seat body sealing ring groove, and an inner seat body sealing ring which is in sealing fit with the third piston rod is arranged in the inner seat body sealing ring groove.

And the outer seat body is provided with an exhaust hole positioned between the inner seat body sealing ring and the outer seat body sealing ring.

The emptying hole is provided with a respirator.

The lower part of the first connecting seat is provided with an oil discharging hole communicated with the right end of the inner cavity of the left-end hydraulic cylinder, and the lower part of the fourth connecting seat is provided with an oil discharging hole communicated with the left end of the inner cavity of the right-end hydraulic cylinder.

The utility model uses two single-acting hydraulic cylinders as power, the two single-acting hydraulic cylinders are respectively positioned at two ends, the left end hydraulic cylinder oil inlet and the right end hydraulic cylinder return oil, the piston of the device moves rightwards to realize the compression of the gas, the right end hydraulic cylinder oil inlet and the left end hydraulic cylinder return oil, and the piston of the device moves leftwards to realize the compression of the gas; through the arrangement of the two single-action hydraulic cylinders, only pressure but not tension is applied between the piston and the piston rod in the working process, so that the piston rod can be effectively prevented from being broken; the first piston rod and the left hydraulic piston and the third piston rod and the right hydraulic piston are connected in a mutual abutting mode, so that the connecting difficulty of high coaxiality required when the piston rods are fixedly connected with the hydraulic pistons is avoided, the processing precision is correspondingly reduced, and the cost and the assembly difficulty are favorably reduced; the first piston rod, the second piston rod and the third piston rod are all provided with pistons which are integrally processed and formed, so that the high coaxiality of the pistons and the piston rods connected with the pistons can be realized under the condition of not needing high processing precision, and the manufacturing cost is effectively reduced; the piston and the piston rod are integrally formed, so that the assembly links of the piston and the piston rod are reduced, the whole piston and piston rod system only has two assembly links of the first piston rod, the second piston rod and the third piston rod, the assembly difficulty can be greatly reduced, the system can be favorably kept to be stable in operation, the abrasion of the sealing ring is reduced, and the service life of the device can be greatly prolonged.

Drawings

The following detailed description of embodiments of the present invention is provided with reference to the accompanying drawings:

fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1; (ii) a

FIG. 3 is an enlarged view of section C of FIG. 1;

FIG. 4 is an enlarged view of portion B of FIG. 1;

fig. 5 is a first operation diagram of the present invention;

fig. 6 is a second operation schematic diagram of the present invention.

Detailed Description

The utility model provides a gas multistage compression device, which is shown in figure 1 and comprises a hydraulic cylinder and a gas compression cylinder, wherein the hydraulic cylinder comprises a left-end hydraulic cylinder 1 and a right-end hydraulic cylinder 2, and the gas compression cylinder comprises a low-pressure cylinder 3, a middle-pressure cylinder 4 and a high-pressure cylinder 5; the hydraulic cylinder and the gas compression cylinder are coaxially arranged, and the left end hydraulic cylinder 1, the low pressure cylinder 3, the high pressure cylinder 5, the middle pressure cylinder 4 and the right end hydraulic cylinder 2 are sequentially arranged from left to right; the advantage of the high pressure cylinder 5 being arranged between the low pressure cylinder 3 and the intermediate pressure cylinder 4 is that: if the high pressure cylinder 5 is axially leaked, the leaked gas enters the low pressure cylinder 3 and the medium pressure cylinder 4, which is beneficial to safety. Left end pneumatic cylinder 1 and low pressure jar 3 link to each other through first connecting seat 6, and low pressure jar 3 and high pressure jar 5 link to each other through second connecting seat 7, and high pressure jar 5 and medium pressure jar 4 link to each other through third connecting seat 8, and medium pressure jar 4 and right-hand member pneumatic cylinder 2 link to each other through fourth connecting seat 9. A left hydraulic piston 10 is arranged in the left end hydraulic cylinder 1, a right hydraulic piston 11 is arranged in the right end hydraulic cylinder, a first piston rod 12 passes through the first connecting seat 6, the left end of the first piston rod abuts against the left hydraulic piston 10, the right end of the first piston rod is positioned in the low pressure cylinder 3, and a low pressure piston 13 which is integrally formed with the first piston rod and is positioned in the low pressure cylinder is arranged on the first piston rod 12; the right end of the third piston rod 14 is abutted against the right hydraulic piston 11 after passing through the fourth connecting seat 9, the left end of the third piston rod is positioned in the intermediate pressure cylinder 4, and the intermediate pressure piston 15 which is integrally formed with the third piston rod and is positioned in the intermediate pressure cylinder is arranged on the third piston rod 14; the left end of the second piston rod 16 passes through the second connecting seat 7 and then is connected with the first piston rod 12, the right end passes through the third connecting seat 8 and then is connected with the third piston rod 14, and the second piston rod 16 is provided with a high-pressure piston 17 which is integrally formed with the second piston rod and is positioned in the high-pressure cylinder 5; the upper part of the first connecting seat 6 is provided with an emptying hole 18 communicated with the right end of the inner cavity of the left end hydraulic cylinder 1, and the upper part of the fourth connecting seat 9 is provided with an emptying hole 18 communicated with the left end of the inner cavity of the right end hydraulic cylinder; the evacuation holes 18 are fitted with respirators (not shown) that filter air and muffle sound. The upper part and the lower part of the first connecting seat 6 are respectively provided with a first-stage air outlet hole 19a and a first-stage air inlet hole 20a which are communicated with the left end of the inner cavity of the low pressure cylinder, the upper part of the second connecting seat 7 is provided with a first-stage air outlet hole 19b which is communicated with the right end of the inner cavity of the low pressure cylinder 3 and a third-stage air outlet hole 21a which is communicated with the left end of the inner cavity of the high pressure cylinder 5, and the lower part of the second connecting seat is provided with a first-stage air inlet hole 20b which is communicated with the right end of the inner cavity of the low pressure cylinder 3 and a third-stage air inlet hole 22a which is communicated with the left end of the inner cavity of the high pressure cylinder 5; the upper part of the third connecting seat 8 is provided with a third-stage air outlet 21b communicated with the right end of the inner cavity of the high-pressure cylinder 5 and a second-stage air outlet 23a communicated with the left end of the inner cavity of the intermediate pressure cylinder 4, and the lower part thereof is provided with a third-stage air inlet 22b communicated with the right end of the inner cavity of the high-pressure cylinder and a second-stage air inlet 24a communicated with the left end of the inner cavity of the intermediate pressure cylinder; the upper part of the fourth connecting seat 9 is provided with a second-stage air outlet 23b communicated with the right end of the inner cavity of the middle pressure cylinder 4, and the lower part thereof is provided with a second-stage air inlet 24b communicated with the right end of the inner cavity of the middle pressure cylinder; the air outlet hole and the air inlet hole are connected with one-way valves or the air outlet hole and the air inlet hole are internally provided with one-way valves, and the one-way valves are omitted in the figure 1. The first-stage air outlet hole 19a and the first-stage air outlet hole 19b are communicated with the second-stage air inlet hole 24a and the second-stage air inlet hole 24b, the second-stage air outlet hole 23a and the second-stage air outlet hole 23b are communicated with the third-stage air inlet hole 22a and the third-stage air inlet hole 22b, the left end of the left-end hydraulic cylinder 1 is provided with a liquid inlet hole 25, and the right end of the right-end hydraulic cylinder 2 is provided with a liquid inlet hole 26. In order to realize the installation and positioning of the hydraulic piston and the corresponding piston rod, a left inserting counter bore is arranged on the left hydraulic piston 10, the left end face of the first piston rod 12 abuts against the bottom face of the left inserting counter bore, and the first piston rod 12 is in clearance fit with the left inserting counter bore; the right hydraulic piston 11 is provided with a right insertion counter bore, the right end face of the third piston rod 14 abuts against the bottom face of the right insertion counter bore, and the third piston rod 14 is in clearance fit with the right insertion counter bore. The integral forming means that the piston rod and the piston are simultaneously formed on one blank.

In order to realize sealing between the cylinder bodies, a sealing mechanism is arranged between the piston rod and the corresponding connecting seat. The sealing mechanism comprises a first piston rod sealing mechanism, a second piston rod sealing mechanism and a third piston rod sealing mechanism.

Referring to fig. 1 and 2, the first piston rod sealing mechanism includes a first connecting seat 6, the first connecting seat is a two-body structure composed of an inner seat body 61 and an outer seat body 62, a ring groove is arranged on the hole wall of the piston rod penetrating hole of the outer seat body, and an outer seat body sealing ring 27 which is in sealing fit with the first piston rod is arranged in the ring groove; the piston rod penetrating holes of the inner seat body are stepped holes and are called seat body stepped holes, the small holes of the seat body stepped holes are used for penetrating and installing the piston rods, at least two ring disks 28 are arranged in the large holes of the seat body stepped holes, the number of the ring disks 28 shown in the figure is three, the sum of the thicknesses of the ring disks is the same as the depth of the large holes of the seat body stepped holes, the stepped holes are formed in the ring disks 28 and are called disk body stepped holes, and the small holes of the disk body stepped holes are used for penetrating and installing the piston rods; the large holes of the stepped holes of the disc body of the innermost ring disc 28 and the steps of the stepped holes of the seat body enclose an inner seat body sealing ring groove, the large holes of the stepped holes of the disc bodies of the other ring discs and the end surface of the inner side ring disc adjacent to the ring disc enclose an inner seat body sealing ring groove, and an inner seat body sealing ring 29 which is in sealing fit with the first piston rod is arranged in the inner seat body sealing ring groove. If the first connecting seat 6 is of an integral structure, a sealing ring groove is formed on the wall of a piston rod penetrating hole, and the piston rod penetrating hole is large in length, so that a sealing ring needs to be plugged into the groove by a tool, the sealing ring is easy to damage, and the sealing ring is not easy to take out and replace; the sealing ring groove of the inner base body is arranged by adopting the structure, the sealing ring can be sleeved on the piston rod firstly and then positioned by the ring disc 28, so that the mounting difficulty of the sealing ring can be greatly reduced, meanwhile, the sealing ring is not easy to damage, and correspondingly, the sealing ring is easier to disassemble. The outer seat body 62 is provided with an exhaust hole 30 positioned between the inner seat body sealing ring 29 and the outer seat body sealing ring 27; if the sealing effect of the inner seat sealing ring 29 is deteriorated and gas leaks from the left end of the low pressure cylinder 3, the leaked gas can enter the recovery device through the exhaust hole 30, so as to avoid safety accidents.

Referring to fig. 1 and 3, the third piston rod sealing mechanism includes a fourth connecting seat 9, the fourth connecting seat is a two-body structure composed of an inner seat body 91 and an outer seat body 92, a ring groove is arranged on the hole wall of the piston rod through hole of the outer seat body, and an outer seat body sealing ring 31 which is in sealing fit with the third piston rod is arranged in the ring groove; the piston rod penetrating holes of the inner seat body are stepped holes and are called seat body stepped holes, the small holes of the seat body stepped holes are used for penetrating and installing the piston rods, at least two ring disks 32 are arranged in the large holes of the seat body stepped holes, the number of the ring disks 32 shown in the figure is three, the sum of the thicknesses of the ring disks 32 is the same as the depth of the large holes of the seat body stepped holes, the ring disks are provided with stepped holes and are called disk body stepped holes, and the small holes of the disk body stepped holes are used for penetrating and installing the piston rods; the large holes of the stepped holes of the disc body of the innermost ring disc 32 and the steps of the stepped holes of the seat body enclose an inner seat body sealing ring groove, the large holes of the stepped holes of the disc bodies of the other ring discs and the end surface of the inner side ring disc adjacent to the ring disc enclose an inner seat body sealing ring groove, and an inner seat body sealing ring 33 which is in sealing fit with the third piston rod is arranged in the inner seat body sealing ring groove. The fourth connecting seat 9 is designed to have a two-body structure and a forming manner of the inner seat body seal ring groove, so as to be convenient to install under the condition that the inner seat body seal ring 33 is not easy to damage, and easy to take out during replacement, and these design ideas are the same as those of the first piston rod sealing mechanism. The outer seat body 92 is provided with an exhaust hole 34 positioned between the inner seat body sealing ring and the outer seat body sealing ring; if the sealing effect of the inner seat sealing ring 33 is deteriorated and gas leaks from the right end of the intermediate pressure cylinder 4, the leaked gas can enter the recovery device through the exhaust hole 34, so as to avoid safety accidents.

Referring to fig. 1 and 4, the second piston rod sealing mechanism includes a second connecting seat 7 and a third connecting seat 8, both of which are two-body structures composed of an inner seat body 71 and an outer seat body 72; piston rod through holes of the inner seat body 71 and the outer seat body 72 are stepped holes which are respectively called as an inner seat body stepped hole and an outer seat body stepped hole, and small holes of the inner seat body stepped hole and the outer seat body stepped hole are used for through mounting piston rods; an inner ring disc 35 is arranged in a large hole of the inner seat body stepped hole, the inner ring disc is provided with a stepped hole and is called an inner disc body stepped hole, an outer ring disc 36 is arranged in a large hole of the outer seat body stepped hole, the outer ring disc is provided with a stepped hole and is called an outer disc body stepped hole, and the inner disc body stepped hole and a small hole of the outer disc body stepped hole are used for being penetrated with a piston rod; the large hole of the inner disc body stepped hole and the step of the inner base body stepped hole enclose an inner sealing groove, and the large hole of the outer disc body stepped hole and the step of the outer base body stepped hole enclose an outer sealing groove; sealing rings 37 which are in sealing fit with the second piston rod are arranged in the inner sealing groove and the outer sealing groove; the sum of the depths of the large holes of the outer seat body stepped holes and the large holes of the inner seat body stepped holes is equal to the sum of the thicknesses of the inner ring disc and the outer ring disc. The second connecting seat 7 and the third connecting seat 8 are both formed in a two-body structure and in the inner sealing groove and the outer sealing groove, so that the sealing ring 37 is not easily damaged and is convenient to mount and the sealing ring 37 is easily taken out during replacement.

Referring to fig. 1, 2 and 3: the lower part of the first connecting seat is provided with an oil discharging hole 38 communicated with the right end of the inner cavity of the left-end hydraulic cylinder, and the lower part of the fourth connecting seat is provided with an oil discharging hole 38 communicated with the left end of the inner cavity of the right-end hydraulic cylinder. The oil discharge hole 38 functions in: when the hydraulic piston sealing ring is failed, hydraulic oil leaked by the hydraulic cylinder can be discharged from the oil discharging hole 38 to prevent safety accidents caused by oil-gas mixing, and whether the hydraulic piston sealing ring is failed in sealing can be found in time by observing whether the hydraulic oil flows out of the oil discharging hole 38.

The above-described inner and outer orientations are defined with reference to the high-pressure cylinder 5, and the one closer to the high-pressure cylinder 5 is inner and the one farther from the high-pressure cylinder 5 is outer.

The action process of the utility model is as follows: before the air compressor is used, the first-stage air inlet hole 20a and the first-stage air inlet hole 20b are communicated with an air source to be compressed through pipelines, the third-stage air outlet hole 21a and the third-stage air outlet hole 21b are communicated with an air storage device, and the left-end hydraulic cylinder 1 and the right-end hydraulic cylinder 2 are communicated with a hydraulic station. Because the gas source to be compressed has initial pressure, the gas enters the low pressure cylinder 3 through the first-stage gas inlet hole 20a and the first-stage gas inlet hole 20b, if the initial state of the device acts in the direction indicated by an arrow A in fig. 5, the right-end hydraulic cylinder 2 is fed with oil, and the left-end hydraulic cylinder 1 is in an oil discharge state; under the push of the right hydraulic cylinder 2, the whole piston and piston rod system moves along the direction shown by an arrow A, the left cylinder pressure of the low-pressure piston 13 rises and the right cylinder pressure falls in the low-pressure cylinder, then the gas to be compressed enters the inner cavity of the low-pressure cylinder on the right side of the low-pressure piston 13 through the one-way valve on the first-stage air inlet hole 20b, the gas in the inner cavity of the low-pressure cylinder on the left side of the low-pressure piston 13 enters the inner cavity of the medium-pressure cylinder 4 on the right side of the medium-pressure piston 15 through the one-way valve on the first-stage air outlet hole 19a and the one-way valve on the second-stage air inlet hole 24b, the gas in the inner cavity of the medium-pressure cylinder 4 on the left side of the medium-pressure piston 15 enters the inner cavity of the high-pressure cylinder 5 on the right side of the high-pressure piston 17 through the one-way valve on the second-stage air outlet hole 23a and the one-way valve on the third-stage air inlet hole 22b, and the gas in the inner cavity of the high-pressure cylinder 5 on the left side of the high-pressure piston 17 is pressed into the gas storage device through the one-stage air outlet hole 21 a; in the compression process, the one-way valves on the primary air inlet hole 20a, the primary air outlet hole 19b, the secondary air inlet hole 24a, the secondary air outlet hole 23b, the tertiary air inlet hole 22a and the tertiary air outlet hole 21b are in a closed state. After the compression process is completed along the direction shown by the arrow A, the compression is performed according to the direction shown by the arrow B in FIG. 6, at this time, the left-end hydraulic cylinder 1 is filled with oil, the right-end hydraulic cylinder 2 is in an oil discharge state, under the pushing action of the left-end hydraulic cylinder 1, the whole piston and piston rod system moves along the direction shown by the arrow B, the gas to be compressed enters the inner cavity of the low-pressure cylinder on the left side of the low-pressure piston 13 through the one-way valve on the primary air inlet hole 20a, the gas in the inner cavity of the low-pressure cylinder on the right side of the low-pressure piston 13 enters the inner cavity of the medium-pressure cylinder 4 on the left side of the medium-pressure piston 15z through the one-way valve on the primary air outlet hole 19B and the one-way valve on the secondary air inlet hole 24a, the gas in the inner cavity of the medium-pressure cylinder 4 on the right side of the medium-pressure piston 15 enters the inner cavity of the high-pressure cylinder 5 on the left side of the high-pressure piston 17 through the one-way valve on the secondary air outlet hole 23B and the one-way valve on the tertiary air inlet hole 22a, and the gas in the inner cavity of the high-pressure cylinder 5 on the right side of the high-pressure piston 17 is pressed into the gas storage device through the tertiary air outlet hole 21B; in the compression process, the one-way valves on the primary air inlet hole 20b, the primary air outlet hole 19a, the secondary air inlet hole 24b, the secondary air outlet hole 23a, the tertiary air inlet hole 22b and the tertiary air outlet hole 21a are in a closed state. The above-described compression of gas in the direction indicated by the arrow B in fig. 6 and the compression of gas in the direction indicated by the arrow a in fig. 5 are two opposite compression processes, each of which has six check valves opened and the other six check valves closed. The continuous compression of the gas can be realized by continuously reciprocating the compression process in the directions shown by the arrow A and the arrow B.

The utility model provides a multistage gas compression device adapts to the compression of gases such as air, inert gas, natural gas and hydrogen, especially adapts to compressed hydrogen, and safe operation cycle is long, and compression efficiency is high.

Claims (10)

1. The utility model provides a gaseous multistage compression device, includes pneumatic cylinder and gas compression jar, its characterized in that: the hydraulic cylinder comprises a left end hydraulic cylinder and a right end hydraulic cylinder, and the gas compression cylinder comprises a low pressure cylinder, a middle pressure cylinder and a high pressure cylinder; the hydraulic cylinder and the gas compression cylinder are coaxially arranged and sequentially comprise a left-end hydraulic cylinder, a low-pressure cylinder, a high-pressure cylinder, a middle-pressure cylinder and a right-end hydraulic cylinder from left to right; the left hydraulic cylinder and the low pressure cylinder are connected through a first connecting seat, the low pressure cylinder and the high pressure cylinder are connected through a second connecting seat, the high pressure cylinder and the middle pressure cylinder are connected through a third connecting seat, and the middle pressure cylinder and the right hydraulic cylinder are connected through a fourth connecting seat; a left hydraulic piston is arranged in the left end hydraulic cylinder, a right hydraulic piston is arranged in the right end hydraulic cylinder, the left end of a first piston rod passes through the first connecting seat and abuts against the left hydraulic piston, the right end of the first piston rod is positioned in the low pressure cylinder, and a low pressure piston which is integrally formed with the first piston rod and is positioned in the low pressure cylinder is arranged on the first piston rod; the right end of the third piston rod is abutted against the right hydraulic piston after penetrating through the fourth connecting seat, the left end of the third piston rod is positioned in the intermediate pressure cylinder, and the third piston rod is provided with an intermediate pressure piston which is integrally formed with the third piston rod and is positioned in the intermediate pressure cylinder; the left end of the second piston rod penetrates through the second connecting seat and then is connected with the first piston rod, the right end of the second piston rod penetrates through the third connecting seat and then is connected with the third piston rod, and the second piston rod is provided with a high-pressure piston which is integrally formed with the second piston rod and is positioned in the high-pressure cylinder; the upper part of the first connecting seat is provided with an emptying hole communicated with the right end of the inner cavity of the left-end hydraulic cylinder, and the upper part of the fourth connecting seat is provided with an emptying hole communicated with the left end of the inner cavity of the right-end hydraulic cylinder; the upper part and the lower part of the first connecting seat are respectively provided with a first-stage air outlet hole and a first-stage air inlet hole which are communicated with the left end of the inner cavity of the low pressure cylinder, the upper part of the second connecting seat is provided with a first-stage air outlet hole which is communicated with the right end of the inner cavity of the low pressure cylinder and a third-stage air outlet hole which is communicated with the left end of the inner cavity of the high pressure cylinder, and the lower part of the second connecting seat is provided with a first-stage air inlet hole which is communicated with the right end of the inner cavity of the low pressure cylinder and a third-stage air inlet hole which is communicated with the left end of the inner cavity of the high pressure cylinder; the upper part of the third connecting seat is provided with a third-stage air outlet communicated with the right end of the inner cavity of the high-pressure cylinder and a second-stage air outlet communicated with the left end of the inner cavity of the intermediate-pressure cylinder, and the lower part of the third connecting seat is provided with a third-stage air inlet communicated with the right end of the inner cavity of the high-pressure cylinder and a second-stage air inlet communicated with the left end of the inner cavity of the intermediate-pressure cylinder; the upper part of the fourth connecting seat is provided with a second-stage air outlet communicated with the right end of the inner cavity of the intermediate pressure cylinder, and the lower part of the fourth connecting seat is provided with a second-stage air inlet communicated with the right end of the inner cavity of the intermediate pressure cylinder; the air outlet holes and the air inlet holes are connected with one-way valves or the air outlet holes and the air inlet holes are internally provided with one-way valves, the primary air outlet hole is communicated with the secondary air inlet hole, the secondary air outlet hole is communicated with the tertiary air inlet hole, the left end of the left-end hydraulic cylinder is provided with a liquid inlet hole, and the right end of the right-end hydraulic cylinder is provided with a liquid inlet hole; and a sealing mechanism is arranged between each piston rod and the corresponding connecting seat.

2. A gas multi-stage compression apparatus as claimed in claim 1, wherein: the left hydraulic piston is provided with a left inserting counter bore, the left end face of the first piston rod abuts against the bottom face of the left inserting counter bore, and the first piston rod is in clearance fit with the left inserting counter bore; the right hydraulic piston is provided with a right insertion counter bore, the right end face of the third piston rod abuts against the bottom face of the right insertion counter bore, and the third piston rod is in clearance fit with the right insertion counter bore.

3. A gas multi-stage compression apparatus as claimed in claim 1 in which: the sealing mechanism comprises a first piston rod sealing mechanism, a second piston rod sealing mechanism and a third piston rod sealing mechanism.

4. A gas multi-stage compression apparatus as claimed in claim 3 in which: the first piston rod sealing mechanism comprises a first connecting seat, the first connecting seat is of a two-body structure consisting of an inner seat body and an outer seat body, a ring groove is arranged on the hole wall of a piston rod penetrating hole of the outer seat body, and an outer seat body sealing ring which is in sealing fit with the first piston rod is arranged in the ring groove; the piston rod penetrating hole of the inner seat body is a step hole and is called a seat body step hole, the small hole of the seat body step hole is used for penetrating and installing the piston rod, at least two ring discs are arranged in the large hole of the seat body step hole, the sum of the thicknesses of the ring discs is the same as the depth of the large hole of the seat body step hole, the ring discs are provided with step holes and are called disk body step holes, and the small hole of the disk body step hole is used for penetrating and installing the piston rod; the large holes of the stepped holes of the disc bodies of the innermost ring discs and the steps of the stepped holes of the seat bodies enclose an inner seat body sealing ring groove, the large holes of the stepped holes of the disc bodies of the other ring discs and the end surface of the inner side ring disc adjacent to the ring disc enclose an inner seat body sealing ring groove, and an inner seat body sealing ring which is in sealing fit with the first piston rod is arranged in the inner seat body sealing ring groove.

5. A gas multi-stage compression apparatus as claimed in claim 4 in which: and the outer seat body is provided with an exhaust hole positioned between the inner seat body sealing ring and the outer seat body sealing ring.

6. A gas multi-stage compression apparatus as claimed in claim 3 in which: the second piston rod sealing mechanism comprises a second connecting seat and a third connecting seat, and the second connecting seat and the third connecting seat are of two-body structures consisting of an inner seat body and an outer seat body; the piston rod through holes of the inner seat body and the outer seat body are stepped holes which are respectively called as an inner seat body stepped hole and an outer seat body stepped hole, and the small holes of the inner seat body stepped hole and the outer seat body stepped hole are used for through mounting the piston rod; an inner ring disc is arranged in a large hole of the inner seat body step hole, the inner ring disc is provided with a step hole and is called an inner disc body step hole, an outer ring disc is arranged in a large hole of the outer seat body step hole, the outer ring disc is provided with a step hole and is called an outer disc body step hole, and the inner disc body step hole and a small hole of the outer disc body step hole are used for being penetrated with a piston rod; the large hole of the inner disc body step hole and the step of the inner base body step hole enclose an inner sealing groove, and the large hole of the outer disc body step hole and the step of the outer base body step hole enclose an outer sealing groove; sealing rings which are in sealing fit with the second piston rod are arranged in the inner sealing groove and the outer sealing groove; the sum of the depths of the large holes of the outer seat body stepped holes and the large holes of the inner seat body stepped holes is the same as the sum of the thicknesses of the inner ring disc and the outer ring disc.

7. The gas multi-stage compression device according to claim 1, wherein the third piston rod sealing mechanism comprises a fourth connecting seat, the fourth connecting seat is a two-body structure consisting of an inner seat body and an outer seat body, a ring groove is arranged on the hole wall of the piston rod through hole of the outer seat body, and an outer seat body sealing ring which is in sealing fit with the third piston rod is arranged in the ring groove; the piston rod penetrating hole of the inner seat body is a step hole and is called a seat body step hole, the small hole of the seat body step hole is used for penetrating and installing the piston rod, at least two ring discs are arranged in the large hole of the seat body step hole, the sum of the thicknesses of the ring discs is the same as the depth of the large hole of the seat body step hole, the ring discs are provided with step holes and are called disk body step holes, and the small hole of the disk body step hole is used for penetrating and installing the piston rod; the large holes of the stepped holes of the disc bodies of the innermost ring discs and the steps of the stepped holes of the seat bodies enclose an inner seat body sealing ring groove, the large holes of the stepped holes of the disc bodies of the other ring discs and the end surface of the inner side ring disc adjacent to the ring disc enclose an inner seat body sealing ring groove, and an inner seat body sealing ring which is in sealing fit with the third piston rod is arranged in the inner seat body sealing ring groove.

8. A gas multi-stage compression apparatus as claimed in claim 7 in which: and the outer seat body is provided with an exhaust hole positioned between the inner seat body sealing ring and the outer seat body sealing ring.

9. A gas multi-stage compression apparatus as claimed in claim 1, wherein: the emptying hole is provided with a respirator.

10. A gas multi-stage compression apparatus as claimed in claim 1, wherein: the lower part of the first connecting seat is provided with an oil discharging hole communicated with the right end of the inner cavity of the left-end hydraulic cylinder, and the lower part of the fourth connecting seat is provided with an oil discharging hole communicated with the left end of the inner cavity of the right-end hydraulic cylinder.

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