1. A connection structure of plunger (1) and cross head (2), its characterized in that: comprising a plunger (1), a crosshead (2), an upper compensating block (5) and a lower compensating block (6), wherein the lower end of the plunger (1) is provided with a disc-shaped structure (11), the upper part of the crosshead (2) is provided with a compensating cavity (3), the upper wall of the compensating cavity (3) is provided with a first through hole (4), the plunger (1) penetrates through the first through hole (4), the upper compensating block (5), the lower compensating block (6) and the disc-shaped structure (11) are positioned in the compensating cavity (3), the upper compensating block (5) is positioned on the upper side of the disc-shaped structure (11), the lower compensating block (6) is positioned on the lower side of the disc-shaped structure (11), a radial clearance is reserved between the outer side wall of the plunger (1) and the inner side wall of the first through hole (4), and an axial clearance is reserved between the upper compensating block (5) and the upper wall of the compensating cavity (3), the upper compensation block (5) and the side wall in the compensation cavity (3) have a radial clearance therebetween, the lower compensation block (6) and the side wall in the compensation cavity (3) have a radial clearance therebetween, and the disc-shaped structure (11) and the side wall in the compensation cavity (3) have a radial clearance therebetween.

2. The connection structure of a plunger (1) and a crosshead (2) according to claim 1, characterized in that: the upper wall of the compensation cavity (3) is a connecting plate (7), and the connecting plate (7) is detachably connected with the side wall of the compensation cavity (3).

3. The connection structure of a plunger (1) and a crosshead (2) according to claim 1, characterized in that: go up the downside of compensation piece (5) with the side of going up of disc structure (11) is the angle compensation fitting surface, the side of going up of compensation piece (6) down with the downside of disc structure (11) is the angle compensation fitting surface, go up the side of compensation piece (5) with the side of going up of compensation chamber (3) is the radial compensation fitting surface, the downside of compensation piece (6) down with the downside of compensation chamber (3) is the radial compensation fitting surface.

4. A connection structure of a plunger (1) and a crosshead (2) according to claim 3, characterised in that: the angle compensation matching surface and the radial compensation matching surface are provided with lubricating oil.

5. A connection structure of a plunger (1) and a crosshead (2) according to claim 3, characterised in that: go up compensation block (5) and be the annular structure, the center of annular structure has second through-hole (8), plunger (1) passes second through-hole (8), go up the inner peripheral surface of compensation block (5) with the clearance has between the lateral wall of plunger (1), the downside of going up compensation block (5) is the sphere, the side of going up of disc structure (11) is the sphere, go up the downside of compensation block (5) with the side sliding fit that goes up of disc structure (11), the side of going up of compensation block (6) is the sphere down, the downside of disc structure (11) is the sphere, the side of going up of compensation block (6) down with the downside sliding fit of disc structure (11).

6. The connection structure of a plunger (1) and a crosshead (2) according to claim 1, characterized in that: the upper compensation block (5) and the lower compensation block (6) are made of nodular cast iron.

7. The connection structure of a plunger (1) and a crosshead (2) according to claim 1, characterized in that: the clearance between the upper compensation block (5) and the upper wall of the compensation cavity (3) is 0.1-0.3 mm.

8. The connection structure of a plunger (1) and a crosshead (2) according to claim 1, characterized in that: the roughness of the lower side of the upper compensation block (5), the upper side of the disc-shaped structure (11), the upper side of the lower compensation block (6) and the lower side of the disc-shaped structure (11) is less than Ra0.4.

9. The connection structure of a plunger (1) and a crosshead (2) according to claim 1, characterized in that: the bonding rate of the lower side surface of the upper compensation block (5) and the upper side surface of the disc-shaped structure (11) is more than 70%, and the bonding rate of the upper side surface of the lower compensation block (6) and the lower side surface of the disc-shaped structure (11) is more than 70%.

10. The connection structure of a plunger (1) and a crosshead (2) according to claim 1, characterized in that: the edges of the upper and lower compensation blocks (5, 6) have rounded corners and the edges of the disc-shaped structure (11) have rounded corners.

Background

The plunger and the crosshead part are important parts of the diaphragm compressor, and the reciprocating motion of the plunger and the crosshead is the main motion of the compressed gas of the diaphragm compressor. Inevitable mechanical deviation exists in the processes of design, part processing and equipment assembly, so that axial and angular deviation exists between reciprocating motion of a plunger and a crosshead after the diaphragm compressor is assembled, the plunger, a cylinder sleeve, the crosshead and a slide are seriously abraded after long-term motion, the service life of core components of the diaphragm compressor is influenced, and the working efficiency of the diaphragm compressor is reduced.

The existing plunger structure adopts a bolt to connect the plunger with a crosshead, and the plunger is rigidly connected and can not adjust the posture. Because the workpieces have machining errors and assembling errors, the actual reciprocating posture of the plunger is not completely vertical but has a certain angle. The plunger of the prior structure can not realize the angle adjustment during the reciprocating motion, so the motion interference can be generated between the plunger and a cylinder sleeve, and the plunger can not smoothly realize the oil supplementing action.

Disclosure of Invention

Therefore, the invention provides a connecting structure of a plunger and a crosshead, which aims to solve the problem that the plunger of the existing diaphragm compressor cannot be adjusted in posture and cannot move smoothly.

In order to achieve the above purpose, the invention provides the following technical scheme:

the utility model provides a connection structure of plunger and cross head, including the plunger, the cross head, go up compensation piece and lower compensation piece, the lower extreme of plunger has the disk structure, the upper portion of cross head has the compensation chamber, the upper wall in compensation chamber has first through-hole, the plunger passes first through-hole, go up compensation piece, lower compensation piece and disk structure are located the compensation intracavity, it is located the upside of disk structure to go up compensation piece, lower compensation piece is located the downside of disk structure, radial clearance has between the lateral wall of plunger and the inside wall of first through-hole, axial clearance has between the upper wall in last compensation piece and the compensation chamber, radial clearance has between the lateral wall in last compensation piece and the compensation intracavity, radial clearance has between the lateral wall in lower compensation piece and the compensation intracavity, radial clearance has between the lateral wall in disk structure and the compensation intracavity.

Further, the upper wall of the compensation cavity is a connecting plate, and the connecting plate is detachably connected with the side wall of the compensation cavity.

Furthermore, the lower side surface of the upper compensation block and the upper side surface of the disc-shaped structure are angle compensation matching surfaces, the upper side surface of the lower compensation block and the lower side surface of the disc-shaped structure are angle compensation matching surfaces, the upper side surface of the upper compensation block and the upper side surface of the compensation cavity are radial compensation matching surfaces, and the lower side surface of the lower compensation block and the lower side surface of the compensation cavity are radial compensation matching surfaces.

Further, the angle compensation mating surface and the radial compensation mating surface are provided with lubricating oil.

Furthermore, the upper compensation block is of an annular structure, a second through hole is formed in the center of the annular structure, the plunger penetrates through the second through hole, a gap is formed between the inner circumferential surface of the upper compensation block and the outer side wall of the plunger, the lower side surface of the upper compensation block is a spherical surface, the upper side surface of the disc-shaped structure is a spherical surface, the lower side surface of the upper compensation block is in sliding fit with the upper side surface of the disc-shaped structure, the upper side surface of the lower compensation block is a spherical surface, the lower side surface of the disc-shaped structure is a spherical surface, and the upper side surface of the lower compensation block is in sliding fit with the lower side surface of the disc-shaped structure.

Further, the material of the upper compensation block and the lower compensation block is nodular cast iron.

Further, the gap between the upper compensation block and the upper wall of the compensation cavity is 0.1-0.3 mm.

Further, the roughness of the lower side of the upper compensation block, the upper side of the disc-shaped structure, the upper side of the lower compensation block and the lower side of the disc-shaped structure is less than ra0.4.

Further, the bonding rate of the lower side surface of the upper compensation block and the upper side surface of the disc-shaped structure is more than 70%, and the bonding rate of the upper side surface of the lower compensation block and the lower side surface of the disc-shaped structure is more than 70%.

Further, the edges of the upper and lower compensation blocks have rounded corners, and the edges of the disc-shaped structure have rounded corners.

The invention has the following advantages: because the upper compensation block, the lower compensation block and the disc-shaped structure have radial clearances in the radial direction and the side wall of the compensation cavity, and a radial clearance is formed between the outer side wall of the plunger and the inner side wall of the first through hole, the plunger can radially displace to realize radial compensation, the upper compensation block also has an axial clearance in the axial direction and the upper wall of the compensation cavity, the plunger can rotate in the compensation cavity to realize radial compensation and angle compensation simultaneously, so that the plunger can timely perform self-adjustment, the requirements on processing and assembly are reduced, the smooth reciprocating motion is ensured, the smooth oil supplementing action is realized, and the failure rate of equipment is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention 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 should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the functions and purposes of the present invention, should still fall within the scope covered by the contents disclosed in the present invention.

Fig. 1 is a partial structural view illustrating a connection structure of a plunger and a crosshead according to an embodiment of the present invention;

fig. 2 is an overall structural view illustrating a connection structure of a plunger and a crosshead according to an embodiment of the present invention;

FIG. 3 is a schematic view of a connection structure of a plunger and a crosshead for realizing radial compensation according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a connection structure of a plunger and a crosshead for simultaneously implementing radial compensation and angular compensation according to an embodiment of the present invention.

In the figure: 1-a plunger; 2-crosshead; 3-a compensation chamber; 4-a first via; 5-an upper compensation block; 6-lower compensation block; 7-a connecting plate; 8-a second via; 9-upper slideway; 10-a glidepath; 11-disc-shaped structure.

Detailed Description

The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. 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 invention.

In the present specification, the terms "upper", "lower", "left", "right", "middle", and the like are used for clarity of description, and are not intended to limit the scope of the present invention, and changes or modifications in the relative relationship may be made without substantial changes in the technical content.

As shown in fig. 1, the embodiment of the present invention provides a connection structure of a plunger 1 and a crosshead 2, including the plunger 1, the crosshead 2, an upper compensating block 5 and a lower compensating block 6, the lower end of the plunger 1 has a disc structure 11, the upper portion of the crosshead 2 has a compensating chamber 3, the upper wall of the compensating chamber 3 has a first through hole 4, the plunger 1 passes through the first through hole 4, the upper compensating block 5, the lower compensating block 6 and the disc structure 11 are located in the compensating chamber 3, the upper compensating block 5 is located on the upper side of the disc structure 11, the lower compensating block 6 is located on the lower side of the disc structure 11, a radial gap is provided between the outer sidewall of the plunger 1 and the inner sidewall of the first through hole 4, an axial gap is provided between the upper compensating block 5 and the upper wall of the compensating chamber 3, a radial gap is provided between the upper compensating block 5 and the sidewall in the compensating chamber 3, a radial gap is provided between the lower compensating block 6 and the sidewall in the compensating chamber 3, there is a radial clearance between the disc-shaped structure 11 and the side wall in the compensation chamber 3.

Because the upper compensating block 5, the lower compensating block 6 and the disc-shaped structure 11 have radial clearances with the side wall of the compensating cavity 3 in the radial direction, and a radial clearance is formed between the outer side wall of the plunger 1 and the inner side wall of the first through hole 4, the plunger 1 can radially displace to realize radial compensation, the upper compensating block 5 also has an axial clearance with the upper wall of the compensating cavity 3 in the axial direction, the plunger 1 can rotate in the compensating cavity 3 to realize radial compensation and angle compensation simultaneously, so that the plunger can timely perform self-adjustment, the requirements on processing and assembly are reduced, the smooth reciprocating motion is ensured, the smooth oil supplementing action is realized, and the failure rate of equipment is reduced.

It should be noted that the radial gap, the axial gap, and the angular dimension in each drawing are enlarged and replaced with letters and numbers only for simplicity and easy understanding.

In an alternative embodiment, the upper wall of the compensation cavity 3 is a connecting plate 7, the connecting plate 7 is detachably connected with the side wall of the compensation cavity 3, specifically, the connecting plate 7 is connected with the side wall of the compensation cavity 3 through bolts, and the installation and the disassembly are convenient, and the maintenance is convenient.

In an alternative embodiment, the lower side of the upper compensation block 5 and the upper side of the disc structure 11 are angle compensation mating surfaces, the upper side of the lower compensation block 6 and the lower side of the disc structure 11 are angle compensation mating surfaces, the upper side of the upper compensation block 5 and the upper side of the compensation chamber 3 are radial compensation mating surfaces, the lower side of the lower compensation block 6 and the lower side of the compensation chamber 3 are radial compensation mating surfaces, and the angle compensation mating surfaces and the radial compensation mating surfaces are provided with lubricating oil. The motion of each fitting surface is guaranteed to be smoother, and excessive friction is reduced.

In an alternative embodiment, the upper compensating block 5 is a ring structure, the center of the ring structure has a second through hole 8, the plunger 1 passes through the second through hole 8, a gap is formed between the inner circumferential surface of the upper compensating block 5 and the outer side wall of the plunger 1, the lower side surface of the upper compensating block 5 is a spherical surface, the upper side surface of the disc structure 11 is a spherical surface, the lower side surface of the upper compensating block 5 is in sliding fit with the upper side surface of the disc structure 11, the upper side surface of the lower compensating block 6 is a spherical surface, the lower side surface of the disc structure 11 is a spherical surface, and the upper side surface of the lower compensating block 6 is in sliding fit with the lower side surface of the disc structure 11. When the spherical surface is designed, the curvature of the spherical surface is as large as possible, so that enough tangential force can be generated when the spherical surface is used, the spherical surface is favorable for sliding, and the angle compensation is more sensitive.

As shown in fig. 2 and 3, when the crosshead 2 and the plunger 1 move upward together, assuming that the center lines of the upper slideway 9 and the lower slideway 10 are parallel, there is no angular error, radial compensation can be realized by means of relative sliding between the lower end surface of the lower compensating block 6 and the upper end surface of the crosshead 2, and the radial clearance on the left side of the plunger 1 is larger than the radial clearance on the right side of the plunger 1, so that the radial positions of the plunger 1, the upper compensating block 5 and the lower compensating block 6 are changed, and the radial compensation function is realized.

As shown in fig. 4, when the crosshead 2 and the plunger 1 move upward together, assuming that there is an angle error between the center lines of the upper and lower runners 9 and 10, the angle compensation can be realized by means of the relative sliding between the spherical surface at the upper end of the lower compensation block 6 and the spherical surface at the lower end of the plunger 1, at this time, the axial gap at the upper side of the upper compensation block 5 becomes smaller, the radial gap at the left side of the upper compensation block 5 is smaller than the radial gap at the right side, and the radial gap at the left side of the lower compensation block 6 is larger than the radial gap at the right side, so that the angle compensation and the radial compensation functions are realized.

When the crosshead drive mechanism moves downwards, the upper compensating block acts, the same principle as when moving upwards. When the crosshead 2 and the plunger 1 move downwards together, radial compensation can be achieved by means of relative sliding between the upper end face of the upper compensating block 5 and the upper wall in the compensating chamber 3, provided that the centre lines of the upper and lower runners 9, 10 are parallel and there is no angular error. When the crosshead 2 and the plunger 1 move downward together, the angular compensation can be achieved by the relative sliding movement between the spherical surface at the lower end of the upper compensating block 5 and the spherical surface at the upper end of the plunger 1, assuming that there is an angular error in the center lines of the upper and lower runners 9, 10.

In an alternative embodiment, the material of the upper and lower compensation blocks 5, 6 is ductile iron. The nodular cast iron has strong compressive capacity, excellent wear resistance and excellent self-lubricating property.

In an alternative embodiment, the clearance between the upper compensation block 5 and the upper wall of the compensation cavity 3 is 0.1-0.3mm, and in design, a reasonable compensation angle meeting the use function is selected according to the actual situation of the product structure, but the axial clearance is not too large, and the axial clearance is too large, so that a large axial impact load is easily generated, and the reliability of the product is influenced, and the clearance is preferably 0.2 mm.

In an alternative embodiment, the roughness of the lower side of the upper compensation block 5, the upper side of the disc-shaped structure 11, the upper side of the lower compensation block 6 and the lower side of the disc-shaped structure 11 is not higher than ra0.4.

In an alternative embodiment, the lower side of the upper compensation block 5 and the upper side of the disc shaped structure 11 are attached at a rate of 70% or more and the upper side of the lower compensation block 6 and the lower side of the disc shaped structure 11 are attached at a rate of 70% or more.

In an alternative embodiment, the edges of the upper and lower compensation blocks 5, 6 have rounded corners and the edges of the disc-shaped structure 11 have rounded corners. Avoid producing the indentation when the atress, reduce the relative slip that influences between each compensation binding face.

Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.