CN114688003A

CN114688003A - High-pressure diaphragm compressor

Info

Publication number: CN114688003A
Application number: CN202210172957.9A
Authority: CN
Inventors: 贾晓晗; 任省栋; 张佳侗; 彭学院
Original assignee: Xian Jiaotong University
Current assignee: Xian Jiaotong University
Priority date: 2022-02-22
Filing date: 2022-02-22
Publication date: 2022-07-01
Anticipated expiration: 2042-02-22
Also published as: WO2023159998A1; CN114688003B

Abstract

The application discloses high-pressure diaphragm compressor relates to diaphragm compressor technical field. The piston sealing problem of the high-pressure diaphragm compressor is solved, and the problem that air is easily mixed in an oil side diaphragm cavity is solved. The high-pressure diaphragm compressor comprises a gas side diaphragm head and an oil side diaphragm head which are sequentially arranged along the axial direction; a diaphragm and an oil distribution disc are arranged between the gas-side diaphragm head and the oil-side diaphragm head, the diaphragm and the oil distribution disc are clamped between the gas-side diaphragm head and the oil-side diaphragm head, and a gas-side diaphragm cavity and an oil-side diaphragm cavity are respectively formed between the diaphragm and the gas-side diaphragm head as well as between the diaphragm and the oil distribution disc; an oil cylinder hole is formed in the oil side membrane head, a piston is arranged in the oil cylinder hole, and a piston rod is arranged below the piston; the upper end of the piston rod is abutted against the lower end of the piston, the piston can be separated from the piston rod, and the lower end of the piston rod is connected with a compressor crank connecting rod mechanism. The application is used for improving the performance of the high-pressure diaphragm compressor.

Description

High-pressure diaphragm compressor

Technical Field

The application relates to the technical field of diaphragm compressors, in particular to a high-pressure diaphragm compressor.

Background

The diaphragm compressor is a positive displacement compressor, and is widely applied to the petrochemical field such as a hydrogen station and the like for compressing and conveying various high-purity gases, precious rare gases, toxic and harmful gases and corrosive gases due to good sealing performance, wide pressure range and large compression ratio.

The diaphragm head body of the diaphragm compressor generally consists of a gas-side diaphragm head, an oil-side diaphragm head and a diaphragm. The diaphragm is clamped between the gas side diaphragm head and the oil side diaphragm head, the peripheral part of the diaphragm is fixedly supported by the oil gas side diaphragm head, and the middle part of the diaphragm forms an oil side diaphragm cavity and a gas side diaphragm cavity with the oil side diaphragm head and the gas side diaphragm head respectively. The oil side film cavity is filled with hydraulic oil, and the gas side film cavity is filled with compressed working medium. The piston pushes hydraulic oil in the oil side membrane cavity to drive the diaphragm to deform to compress the air side membrane cavity to realize compression of the working medium. In the prior art, a piston is driven by a crank connecting rod to push hydraulic oil so as to drive a diaphragm to perform reciprocating deflection deformation, and a primary low-pressure oil pump, a secondary oil supplementing plunger pump and an oil spilling valve are arranged to ensure that a diaphragm head main body works normally. The structure is very mature for medium and low pressure environment, but has the following disadvantages for high pressure environment:

1. the high-pressure working environment has more severe requirements on the sealing of the piston, and a high-pressure combined piston ring or plunger piston is generally used for sealing, but the two sealing modes have higher requirements on the centering performance of the piston and an oil side membrane head, so that the diaphragm compressor is not easy to realize in the actual processing and assembly. Specifically, the existing 45MPa diaphragm compressor has the condition that the piston sealing fails or the plunger and the cylinder sleeve are worn and seized, and the problem is more difficult to solve for the diaphragm compressor with 90MPa or even more than 200 MPa.

2. Because high-pressure diaphragm compressor's sealed difficult assurance, cause sealed effect behind the deterioration at reasons such as piston eccentric wear, the leakage quantity of hydraulic oil can increase, but because each stroke can pump into a certain amount of hydraulic oil to oil side membrane cavity through mending oily plunger pump, the benefit oil quantity of hydraulic oil is confirmed by the structural parameter of plunger pump, no matter leak the size of quantity promptly, the benefit oil quantity is certain. Therefore, when the leakage amount is larger than the oil compensation amount, the oil amount in the oil side diaphragm cavity is reduced, the diaphragm can flap the surface of the oil side diaphragm cavity, and large impact stress is formed on the diaphragm to cause the premature breakage of the diaphragm due to the reduction of the service life of the diaphragm. In addition, when the diaphragm slaps the oil side diaphragm chamber, the crank connecting rod can drive the piston to continue moving, and the cavity that forms in the oil side diaphragm chamber produces the negative pressure, and outside gas can get into oil side diaphragm chamber, sneaks into a large amount of gas in the oil and can cause the unable normal work of diaphragm compressor, leads to the machine trouble.

Disclosure of Invention

In order to solve the technical problem, embodiments of the present application provide a high-pressure diaphragm compressor, which not only solves the problems of piston sealing of the high-pressure diaphragm compressor and air mixing in an oil side film cavity, but also solves the problem that oil supplement pressure is too high to be achieved.

In order to achieve the above object, an embodiment of the present application provides a high-pressure diaphragm compressor, including a gas-side diaphragm head and an oil-side diaphragm head sequentially arranged along an axial direction; a diaphragm and an oil distribution disc are arranged between the gas-side diaphragm head and the oil-side diaphragm head, the diaphragm and the oil distribution disc are clamped between the gas-side diaphragm head and the oil-side diaphragm head, and a gas-side diaphragm cavity and an oil-side diaphragm cavity are respectively formed between the diaphragm and the gas-side diaphragm head as well as between the diaphragm and the oil distribution disc; an oil cylinder hole is formed in the oil side membrane head, a piston is arranged in the oil cylinder hole, and a piston rod is arranged below the piston; the upper end of the piston rod is abutted with the lower end of the piston, and the lower end of the piston rod is connected with a compressor crank connecting rod mechanism.

Further, the oil side film cavity is connected with a low-pressure oil pump through an oil supplementing pipeline; the low-pressure oil pump can adjust the oil supplementing amount according to the pressure in the oil side membrane cavity; and the oil supplementing pipeline is provided with a one-way valve, and an opening of the one-way valve faces the low-pressure oil pump.

Further, the low-pressure oil pump is a gear pump or a gerotor pump.

Furthermore, an energy accumulator is also arranged on the oil supplementing pipeline; the accumulator is located between the check valve and the low pressure oil pump.

Further, the piston is a plunger, a piston ring sealing structure or a model piston ring sealing structure.

Furthermore, an oil cylinder sleeve mounting cavity is arranged in the oil side membrane head, an oil cylinder sleeve is arranged in the oil cylinder sleeve mounting cavity, and an inner hole of the oil cylinder sleeve forms the oil cylinder hole.

Furthermore, the gas side membrane head comprises a gas side cylinder cover and a gas distribution plate, the gas distribution plate is positioned below the gas side cylinder cover, the membrane and the gas distribution plate are clamped between the gas side cylinder cover and the oil distribution plate, and a gas side membrane cavity and an oil side membrane cavity are respectively formed between the membrane and the gas distribution plate head and the oil distribution plate.

Further, the oil side film cavity is connected with an overflow valve through an overflow pipeline 11.

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

1. the piston and the piston rod in the embodiment of the application adopt split structures, the two piston rods are mutually abutted, the piston rod is connected with the compressor crank-connecting rod mechanism, and the piston is in a floating state in the oil side membrane head, so that the centering performance of the piston and the oil side membrane head is better ensured, the phenomenon that the piston is eccentrically worn and clamped can be avoided, and the sealing of the piston is more reliable; in addition, after the diaphragm strikes the oil distribution disc, the oil pressure can drop rapidly, when the oil pressure is not enough to push the piston to move, the compressor crank-link mechanism only drives the piston rod to continue moving downwards, the piston is separated from the piston rod, at the moment, negative pressure cannot be generated in the oil side film cavity, and the situation that air is mixed in the oil side film cavity can be avoided.

2. The embodiment of the application only needs a low-pressure oil pump just can realize mending oil, compares prior art and has saved second grade benefit oil plunger pump, makes mend oil and changes the realization, and mends oil volume and can be along with the oil leakage volume automatically regulated.

3. This application embodiment is through setting up the energy storage ware on mending the oil pipe way for mend oil pressure more stable, can avoid reducing the sealed failure problem appearance of check valve life-span that leads to because the check valve vibration.

4. The integrated structure that this application embodiment adopted gas side cylinder cap and distribution plate replaces the gas side membrane head of integral type among the prior art, and the higher material of intensity can be chooseed for use to the gas side cylinder cap, and the distribution plate can select the material according to the required requirement of the compressed medium of carrying, from this, can satisfy the high strength and the high corrosion resistance requirement of gas side membrane head simultaneously.

Drawings

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

FIG. 1 is a schematic structural diagram of example 1 of the present application;

FIG. 2 is a dynamic oil pressure curve according to example 1 of the present application;

fig. 3 is a state diagram of the present application in embodiment 1 in which the piston is separated from the piston rod;

FIG. 4 is a schematic structural diagram of embodiment 2 of the present application;

fig. 5 is a schematic structural diagram of embodiment 3 of the present application.

Detailed Description

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

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

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

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

In high-pressure working scenes such as a hydrogen station and the like, compression equipment for hydrogen or other dangerous and rare gases with the pressure of 90MPa or even more than 200MPa is required, so that the sealing performance of the compression equipment and the cleanliness of a compressed working medium are required to be higher. Only diaphragm compressors can best meet the working requirements, but the high-pressure working environment has higher requirements on the structural strength of the compressor, and the sealing of an oil piston, the service life of a diaphragm and the oil supplementing mode are great challenges faced by the high-pressure diaphragm compressors. Therefore, the embodiment of the application provides a high-pressure diaphragm compressor, the sealing of oil piston is more reliable under high-pressure working environment, gas can not get into the oil cavity, simultaneously the oil supply is realized more easily, and the oil supply can be adjusted along with the leakage amount.

Example 1:

referring to fig. 1, the present embodiment provides a high-pressure diaphragm compressor, which includes a gas-side diaphragm head 1, a diaphragm 2, an oil distribution disc 3, an oil-side diaphragm head 4, a piston 7, a piston rod 8, a low-pressure oil pump 9, a check valve 11, an accumulator 12, and an overflow valve 13.

The air side membrane head 1, the membrane 2, the oil distribution disc 3 and the oil side membrane head 4 are sequentially arranged along the axial direction. The air side membrane head 1 is a split part and comprises an air side cylinder cover 101 and an air distribution disc 102, the air distribution disc 102 is located below the air side cylinder cover 101, the membrane 2 is clamped between the air distribution disc 102 and the oil distribution disc 3, and an air side membrane cavity 5 and an oil side membrane cavity 6 are formed between the membrane 2 and the air distribution disc 102 and between the membrane 2 and the oil distribution disc 3 respectively. Thus, the gas-side cylinder head 101 can be made of a material with higher strength, and the gas distribution plate 102 can be made of a material according to the requirement required by the conveyed compressed medium, so that the requirements of high strength and high corrosion resistance of the gas-side diaphragm head can be met at the same time.

The oil side membrane head 4 is internally provided with an oil cylinder hole 41, the oil cylinder hole 41 is a circular through hole, the piston 7 is arranged in the oil cylinder hole 41, and the piston 7 is used for sealing high-pressure oil in the oil cylinder hole 41 and can reciprocate in the oil cylinder hole 41 to push hydraulic oil to further drive the membrane 2 to do reciprocating flexural deformation. Specifically, the piston 7 may be a plunger, a piston ring seal structure or a piston ring seal structure, which is not limited herein.

A piston rod 8 is arranged below the piston 7. The upper end of the piston rod 8 abuts against the lower end of the piston 7, and the lower end of the piston rod 8 is connected to a compressor crank link mechanism (not shown). Because piston rod 8 and piston 7 separation, both are non-fixed connection, compare integral piston (being that piston rod and piston are an organic whole piece), adopt split type structure, the centering nature of piston 7 and oil cylinder hole 41 is better guaranteed, does not receive the influence of the assembly precision between piston rod 8 and the compressor crank link mechanism promptly, can avoid piston 7 to appear the eccentric wear card dead phenomenon, makes piston 7's sealed more reliable.

Low-pressure oil pump 9 passes through oil supply pipeline 10 and oil side diaphragm chamber 6 intercommunication, and low-pressure oil pump 9 can be according to leaking the quantity regulation oil supply volume of leakage. Specifically, the low-pressure oil pump 9 may be a gear pump or a gerotor pump. A check valve 11 and an accumulator 12 are also provided on the oil replenishment line 10, the accumulator 12 being provided between the check valve 11 and the low pressure oil pump 9. The check valve 11 is used to separate the low pressure oil path and the high pressure oil path. The check valve 11 opens toward the low-pressure oil pump 9 and the accumulator 12. The accumulator 12 can reduce pressure fluctuation during oil supplement, so that the oil supplement pressure is more stable, and the problems of service life reduction and sealing failure of the check valve 11 caused by vibration can be further avoided. The overflow valve 13 is connected with the oil side membrane cavity 6 through an overflow pipeline 14, and redundant hydraulic oil overflows through the overflow valve 13.

Referring to fig. 1 to 3, the working principle of embodiment 1 of the present application is as follows:

in the process of the lower stroke, the oil pressure is almost equal to the suction pressure, and the piston 7 and the piston rod 8 are not connected, so that the piston rod 8 cannot apply tension to the piston 7, the piston 7 moves downwards together with the piston rod 8 under the pushing of the hydraulic oil in the oil side film cavity 6 until the diaphragm 2 collides with the oil distribution disc 3, the oil pressure in the oil side film cavity 6 rapidly drops, when the oil pressure drops to about zero, the oil pressure is insufficient to push the piston 7 to move, only the piston rod 8 is driven by the compressor crank-link mechanism to continue to move downwards at the moment, the piston 7 is static and is separated from the piston rod 8, no negative pressure is generated in the oil side film cavity 6, and the situation that air is mixed in the oil side film cavity can be avoided.

Referring to fig. 2, when the oil pressure is reduced to near zero, the oil pressure pumped by the low-pressure oil pump 9 is higher than the oil pressure in the oil side film cavity 6, and the oil pumped by the low-pressure oil pump 9 can be directly used for oil supplement for the oil side film cavity 6, so that a secondary oil supplement plunger pump is not needed. The oil supplementing pressure is greatly reduced, and the oil supplementing is easier to realize.

In addition, in the prior art, the oil supplement of the low-pressure oil pump 9 and the secondary oil supplement plunger pump is passive oil supplement, the period of the plunger pump is the same as that of the compressor, the oil supplement amount in each stroke is fixed, no matter the leakage amount, quantitative hydraulic oil can be supplemented into the oil side membrane cavity 6, and the adjustment of the oil supplement amount along with the leakage amount cannot be realized. In the embodiment of the application, only the low-pressure oil pump 9 is used for actively supplementing oil, the diaphragm 2 impacts the oil distribution disc 3 when the oil quantity is insufficient, then the oil pressure is rapidly reduced, the hydraulic oil is automatically supplemented into the oil side diaphragm cavity 6, and the oil supplementing quantity is self-regulated along with the leakage quantity. The larger the leakage amount is, the earlier the diaphragm can impact the oil distribution disc, the longer the oil pressure is near the zero line, the more oil is supplemented, and the smaller the oil is.

Example 2:

referring to fig. 4, embodiment 2 differs from embodiment 1 only in that: an oil cylinder sleeve mounting cavity 42 is arranged in the oil side membrane head 4, an oil cylinder sleeve 43 is arranged in the oil cylinder sleeve mounting cavity 42, and an inner hole of the oil cylinder sleeve 43 forms an oil cylinder hole 41. Therefore, the oil cylinder sleeve 43 is convenient to replace after being worn, the cost for processing the oil cylinder hole 41 in the oil cylinder sleeve 43 is lower, and the requirements of cylindricity, surface roughness, hardness and the like of the oil cylinder hole 41 are easier to ensure.

Example 3:

referring to fig. 5, embodiment 3 differs from embodiment 2 only in that: the gas-side membrane head 1 is a one-piece part and will not be described in detail here. Therefore, the gas side membrane head 1 is more convenient to process and lower in cost,

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

Claims

1. A high-pressure diaphragm compressor is characterized by comprising a gas-side diaphragm head and an oil-side diaphragm head which are sequentially arranged along the axial direction;

a diaphragm and an oil distribution disc are arranged between the gas-side diaphragm head and the oil-side diaphragm head, the diaphragm and the oil distribution disc are clamped between the gas-side diaphragm head and the oil-side diaphragm head, and a gas-side diaphragm cavity and an oil-side diaphragm cavity are respectively formed between the diaphragm and the gas-side diaphragm head as well as between the diaphragm and the oil distribution disc;

an oil cylinder hole is formed in the oil side membrane head, a piston is arranged in the oil cylinder hole, and a piston rod is arranged below the piston; the upper end of the piston rod is abutted against the lower end of the piston, and the piston rod can be separated; the lower end of the piston rod is connected with a compressor crank connecting rod mechanism.

2. The high-pressure diaphragm compressor of claim 1, wherein the oil side diaphragm chamber is connected to a low-pressure oil pump through an oil supply line; the low-pressure oil pump can adjust the oil supplementing amount according to the pressure in the oil side membrane cavity; and the oil supplementing pipeline is provided with a one-way valve, and an opening of the one-way valve faces the low-pressure oil pump.

3. The high pressure diaphragm compressor of claim 2, wherein the low pressure oil pump is a gear pump or a gerotor pump.

4. The high-pressure diaphragm compressor of claim 2, wherein an accumulator is further disposed on the oil supply line; the accumulator is located between the check valve and the low pressure oil pump.

5. The high pressure diaphragm compressor of claim 1, wherein the piston is a plunger, a piston ring seal, or a van-piston ring seal.

6. The high-pressure diaphragm compressor of claim 1, wherein an oil cylinder sleeve mounting cavity is arranged in the oil side diaphragm head, an oil cylinder sleeve is arranged in the oil cylinder sleeve mounting cavity, and an inner hole of the oil cylinder sleeve forms the oil cylinder hole.

7. The high pressure diaphragm compressor of claim 1, wherein the gas side diaphragm head comprises a gas side cylinder head and a gas distribution plate, the gas distribution plate is located below the gas side cylinder head, the diaphragm and the gas distribution plate are clamped between the gas side cylinder head and the oil distribution plate, and a gas side diaphragm chamber and an oil side diaphragm chamber are respectively formed between the diaphragm and the gas distribution plate head and the oil distribution plate.

8. The high-pressure diaphragm compressor of claim 1, wherein the oil-side diaphragm chamber is connected to a relief valve through a relief oil line.