CN115143088A

CN115143088A - Double-section type piston structure for diaphragm compressor

Info

Publication number: CN115143088A
Application number: CN202210589620.8A
Authority: CN
Inventors: 彭学院; 赵亚玲; 任省栋; 贾晓晗
Original assignee: Xian Jiaotong University
Current assignee: Xian Jiaotong University
Priority date: 2022-05-27
Filing date: 2022-05-27
Publication date: 2022-10-04
Anticipated expiration: 2042-05-27
Also published as: CN115143088B

Abstract

The application discloses a two segmentation piston structures for diaphragm compressor relates to diaphragm compressor technical field. The length of the hole needing to be subjected to finish machining can be shortened, and the deep hole machining problem of the oil cylinder is solved. The double-section type piston structure for the diaphragm compressor comprises an oil side diaphragm head, a rough machining oil cylinder sleeve section, a finish machining oil cylinder sleeve section, a piston and a piston rod; the oil side membrane head is internally provided with a mounting hole, and the rough machining oil cylinder sleeve section is abutted with the finish machining oil cylinder sleeve section and is connected with the oil side membrane head; at least one part of the finish machining oil cylinder sleeve section and the rough machining oil cylinder sleeve section are positioned in the mounting hole and are in sealing connection with the mounting hole; a first oil cylinder hole is formed in the rough machining oil cylinder sleeve section, and a second oil cylinder hole is formed in the finish machining oil cylinder sleeve section; the piston can reciprocate in the first oil cylinder hole, the first end of the piston rod extends out of the second oil cylinder hole and then is abutted to the piston, and the second end of the piston rod is used for being connected with a compressor crank connecting rod mechanism. The application is used for reducing the processing cost of the high-pressure diaphragm compressor.

Description

Double-section type piston structure for diaphragm compressor

Technical Field

The application relates to the technical field of diaphragm compressors, in particular to a double-section type piston structure for a diaphragm compressor.

Background

The diaphragm compressor is a positive displacement compressor, and is widely applied to the work of a hydrogenation station because of the advantages of good sealing performance, no pollution of compressed media, high single-stage pressure ratio, safe operation, easy maintenance and the like.

A cylinder structure of a conventional diaphragm compressor is shown in fig. 1, and includes a gas-side diaphragm head 01, a gas distribution plate 02, a diaphragm 03, an oil distribution plate 04, an oil-side diaphragm head 05, an oil cylinder sleeve 06, and a piston rod 07. Wherein, a plurality of sealing rings 061 are arranged on the oil cylinder sleeve 06, and a sealing ring 071 and a support ring 072 are arranged on the piston rod 07. The air side membrane head 01 is connected with the oil side membrane head 05 through a long bolt, and the air distribution plate 02, the membrane 03 and the oil distribution plate 04 are clamped between the oil side membrane head 05 and the air side membrane head 01. The oil cylinder sleeve 06 and the oil side membrane head 05 are connected through a bolt. In the working process, the piston rod 07 reciprocates to push hydraulic oil to deform the diaphragm 03, so that the purpose of compressing gas is achieved.

In the design of the diaphragm compressor, the processing of the inner hole of the oil cylinder often becomes a great problem in production, on one hand, the hole is used as a sealing surface of the piston and needs to ensure enough processing precision, and on the other hand, the difficulty is increased for the processing of the oil hole due to the poor cutting processability of the oil cylinder material. Especially under high pressure operating mode, need increase the thickness of hydro-cylinder in order to guarantee that the compressor can bear sufficient pressure, draw ratio L/D >10 this moment, belong to comparatively typical BTA problem, BTA belongs to the semi-enclosed cutting process comparatively complicated among the spot facing work, and the processing condition is abominable, and the existence of chip removal, cooling, heat dissipation scheduling problem also causes professional BTA technical installation expensive, and the precision is difficult to guarantee, and every hydro-cylinder needs BTA's hole only in the diaphragm compressor, has customized the processing cost alone.

Disclosure of Invention

The embodiment of the application provides a two segmentation piston structures for diaphragm compressor, sets up the cylinder liner to two segmentations through setting up the piston to floating to the hole processing with two segmentations hydro-cylinders is different precision, thereby has shortened the length in the hole that needs the finish machining, solves the BTA problem of hydro-cylinder.

In order to achieve the above object, an embodiment of the present application provides a dual-stage piston structure for a diaphragm compressor, including an oil-side diaphragm head, a rough-machining oil cylinder sleeve section, a finish-machining oil cylinder sleeve section, a piston, and a piston rod; the oil side membrane head is internally provided with a mounting hole, and the rough machining oil cylinder sleeve section is abutted with the finish machining oil cylinder sleeve section and is connected with the oil side membrane head; at least one part of the finish machining oil cylinder sleeve section and the rough machining oil cylinder sleeve section are positioned in the mounting hole and are in sealing connection with the mounting hole; a first oil cylinder hole is formed in the rough machining oil cylinder sleeve section, and a second oil cylinder hole is formed in the finish machining oil cylinder sleeve section; the piston can reciprocate in the first oil cylinder hole, the first end of the piston rod extends out of the second oil cylinder hole and then abuts against the piston, and the second end of the piston rod is used for being connected with a compressor crank connecting rod mechanism.

Furthermore, a plurality of annular grooves are formed in the piston rod and are uniformly distributed on the piston rod along the axial direction; and a plurality of guide steel balls uniformly distributed along the circumferential direction of the annular groove are arranged in the annular groove.

Further, the machining accuracy of the first cylinder bore is higher than the machining accuracy of the second cylinder bore.

Further, a first step is formed between an end surface of the annular groove close to the piston and an end surface of the piston rod; a second step is formed between two adjacent annular grooves; the depth of the first cylinder bore is greater than the sum of the stroke of the piston, the axial length of the piston, and the width of the first step, and is less than the sum of the axial length of the piston, the width of the first step, the widths of the plurality of annular grooves, and the widths of the plurality of second steps.

Further, the mounting hole is a stepped hole; the rough machining oil cylinder sleeve section is a step shaft; the small end of the step shaft is matched with the small end of the step hole and is sealed by an oil cylinder sleeve sealing ring; the large end of the step shaft is embedded into the large end of the step hole and is connected with the oil side membrane head through a first bolt.

Further, the finish machining oil cylinder sleeve section comprises a sealing sleeve part and a connecting disc part; the sealing sleeve part is matched with the small end of the stepped hole and is sealed by an oil cylinder sleeve sealing ring; the connecting disc part is connected to the end face of the oil side membrane head through a second bolt.

And further, a piston sealing ring is arranged between the piston and the finish machining oil cylinder sleeve section.

Furthermore, the piston sealing rings are multiple and are uniformly distributed along the axial direction of the piston.

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

1. the piston in the embodiment of the application is floating, the oil cylinder sleeve is in a two-section type, and the piston only reciprocates in one section of the oil cylinder sleeve, so that inner holes of the two sections of oil cylinders can be processed to different precisions, the length of a hole needing finish machining is shortened, and the cost is reduced.

2. The piston in the embodiment of the application is floating, the centering performance of the piston and the oil side membrane head is better guaranteed, the phenomenon that the piston is eccentrically worn and clamped can be avoided, and the sealing of the piston is more reliable.

3. This application embodiment not only plays the supporting role to the piston rod through set up the direction steel ball in the annular groove of piston rod, has also avoided using sliding friction to cause the damage to the piston rod, simultaneously, because be rolling friction between direction steel ball and the oil cylinder cover finishing process section and the oil cylinder cover rough machining section, also reduced the movement resistance of piston, reduced energy loss.

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 a cylinder of a conventional diaphragm compressor;

FIG. 2 is a schematic structural diagram of a two-stage piston structure for a diaphragm compressor according to an embodiment of the present disclosure;

fig. 3 is a schematic view illustrating a piston abutting against a piston rod in a double-stage piston structure for a diaphragm compressor according to an embodiment of the present invention.

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 obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to 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, merely for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present application.

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

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

Referring to fig. 2 and 3, the embodiment of the present application provides a dual-stage piston structure for a diaphragm compressor, which can divide an oil cylinder sleeve into two parts for processing, and provides different precision requirements for each stage, thereby shortening the length of a hole to be finished, and reducing the processing cost. Specifically, the double-section type piston structure for the diaphragm compressor comprises an oil side diaphragm head 1, a rough machining oil cylinder sleeve section 2, a finish machining oil cylinder sleeve section 3, a piston 4 and a piston rod 5.

The oil side membrane head 1 is internally provided with a mounting hole 11, the mounting hole 11 is a stepped hole, and the stepped hole comprises a large end and a small end. The rough machining oil cylinder sleeve section 2 is a step shaft which also comprises a large end and a small end. The big end of the step shaft is embedded into the big end of the step hole and is connected with the oil side membrane head 1 through a first bolt 7. The small end of the step shaft extends into the small end of the step hole, the size of the small end of the step shaft is matched with that of the small end of the step hole, and the small end of the step shaft and the small end of the step hole are sealed through an oil cylinder sleeve sealing ring 6.

The finishing cylinder jacket section 3 comprises a sealing jacket portion 31 and a connecting disc portion 32. The sealing sleeve part 31 extends into the small end of the step hole and is abutted with the rough machining oil cylinder sleeve section 2. The size of the sealing sleeve part 31 is matched with the small end of the stepped hole, and the sealing sleeve part and the small end are also sealed through the oil cylinder sleeve sealing ring 6. The connecting disk portion 32 is connected to the end face of the oil-side diaphragm head 1 by the second bolt 8.

A first oil cylinder hole 21 is arranged in the rough machining oil cylinder sleeve section 2, and a second oil cylinder hole 31 is arranged in the finish machining oil cylinder sleeve section 3. The machining accuracy of the first cylinder bore 21 is higher than that of the second cylinder bore 31.

Referring to fig. 2, the piston 4 and the piston rod 5 are separate bodies, and the piston 4 is provided in the first cylinder bore 21 in a floating manner and is capable of reciprocating in the first cylinder bore 21. The first end of the piston rod 5 extends out of the second cylinder hole 31 and then abuts against the piston 4, and the second end of the piston rod 5 is connected with a compressor crank-link mechanism. From this, the centering nature of piston 4 and oil side membrane head 1 is better guaranteed, can avoid piston 4 eccentric wear card dead phenomenon to appear, and in piston 4 motion process, because piston 4 only moves in first cylinder hole 21, so only to first cylinder hole 21 carry out the finish machining can, and the degree of depth of first cylinder hole 21 is far less than the total depth of whole cylinder hole, has just so avoided deep hole processing's difficult problem.

Referring to fig. 3, in order to enhance the reliability of sealing, five piston sealing rings 9 are arranged between the piston 4 and the finish machining cylinder sleeve section 3, and the five piston sealing rings 9 are uniformly distributed along the axial direction of the piston 4. It should be noted that the number of the piston sealing rings 9 can be selected according to actual working conditions, and is not limited herein.

Referring to fig. 2 and 3, the piston rod 5 is provided with a plurality of annular grooves 51 uniformly distributed in the axial direction, and a first step 52 is formed between the end surface of the annular groove 51 located at the leftmost end and the end surface of the piston rod 5 close to the piston 4. Accordingly, a second step 53 is also formed between adjacent two of the annular grooves 51. Each annular groove 51 is provided with a plurality of guide steel balls 54 uniformly distributed along the circumferential direction of the annular groove 51. The guide steel balls 54 can roll in the axial direction of the first cylinder bore 21.

The depth of the first cylinder bore 21 is greater than the sum of the stroke of the piston 4, the axial length of the piston 4, and the length of the first step 53, preferably greater than 5mm to 10mm, and is less than the sum of the axial length of the piston 4, the width of the first step 52, the width of the plurality of annular grooves 51, and the width of the plurality of second steps 53, preferably 5mm to 10mm. From this, can guarantee in the whole stroke of piston 4, piston 4 only in first cylinder hole 21 reciprocating motion and can not get into in the second cylinder hole 31, and in the whole stroke, only the direction steel ball passes through the gap between rough machining hydro-cylinder cover section 2 and the finish machining hydro-cylinder cover section 3 to can reduce piston 4's movement resistance, reduce energy loss, avoid causing the damage to piston rod 5 simultaneously.

The above description 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 disclosed in the present application should be covered within 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 double-section type piston structure for a diaphragm compressor is characterized by comprising an oil side diaphragm head, a rough machining oil cylinder sleeve section, a finish machining oil cylinder sleeve section, a piston and a piston rod;

the oil side membrane head is internally provided with a mounting hole, and the rough machining oil cylinder sleeve section is abutted with the finish machining oil cylinder sleeve section and is connected with the oil side membrane head; at least one part of the finish machining oil cylinder sleeve section and the rough machining oil cylinder sleeve section are positioned in the mounting hole and are in sealing connection with the mounting hole;

a first oil cylinder hole is formed in the rough machining oil cylinder sleeve section, and a second oil cylinder hole is formed in the finish machining oil cylinder sleeve section; the piston can reciprocate in the first oil cylinder hole, the first end of the piston rod extends out of the second oil cylinder hole and then abuts against the piston, and the second end of the piston rod is used for being connected with a compressor crank connecting rod mechanism.

2. The dual stage piston structure of claim 1, wherein said piston rod has a plurality of annular grooves formed therein, said plurality of annular grooves being axially and uniformly distributed on said piston rod; and a plurality of guide steel balls uniformly distributed along the circumferential direction of the annular groove are arranged in the annular groove.

3. The double stage piston structure for a diaphragm compressor according to claim 1, wherein the machining accuracy of the first cylinder hole is higher than the machining accuracy of the second cylinder hole.

4. The double stage piston structure for a diaphragm compressor according to claim 2, wherein a first step is formed between an end surface of the annular groove close to the piston and an end surface of the piston rod; a second step is formed between two adjacent annular grooves; the depth of the first cylinder bore is greater than the sum of the stroke of the piston, the axial length of the piston, and the width of the first step, and is less than the sum of the axial length of the piston, the width of the first step, the widths of the plurality of annular grooves, and the widths of the plurality of second steps.

5. The double stage piston structure for a diaphragm compressor according to claim 1, wherein the mounting hole is a stepped hole; the rough machining oil cylinder sleeve section is a step shaft; the small end of the step shaft is matched with the small end of the step hole and is sealed by an oil cylinder sleeve sealing ring; the large end of the step shaft is embedded into the large end of the step hole and is connected with the oil side membrane head through a first bolt.

6. The dual stage piston structure for a diaphragm compressor of claim 5, wherein the finishing cylinder jacket section comprises a seal jacket portion and a connecting disc portion; the sealing sleeve part is matched with the small end of the stepped hole and is sealed by an oil cylinder sleeve sealing ring; the connecting disc part is connected to the end face of the oil side membrane head through a second bolt.

7. The dual stage piston arrangement for a diaphragm compressor of claim 1, wherein a piston seal ring is provided between said piston and said finishing cylinder jacket segment.

8. The double stage piston structure for a diaphragm compressor according to claim 7, wherein the piston sealing ring is plural, and plural piston sealing rings are uniformly distributed in an axial direction of the piston.