A connection structure between a plunger and a crosshead

Abstract

The invention discloses a connection structure of a plunger and a crosshead, comprising a plunger, a crosshead, an upper compensation block and a lower compensation block, wherein the lower end of the plunger has a disc-shaped structure, the upper part of the crosshead has a compensation cavity, the upper wall of the compensation cavity has a first through hole, the plunger passes through the first through hole, the upper compensation block, the lower compensation block and the disc-shaped structure are located in the compensation cavity, the upper compensation block is located on the upper side of the disc-shaped structure, the lower compensation block is located on the lower side of the disc-shaped structure, a radial gap is provided between the outer side wall of the plunger and the inner side wall of the first through hole, an axial gap is provided between the upper compensation block and the upper wall of the compensation cavity, a radial gap is provided between the upper compensation block and the side wall in the compensation cavity, a radial gap is provided between the lower compensation block and the side wall in the compensation cavity, and a radial gap is provided between the disc-shaped structure and the side wall in the compensation cavity. The plunger can be radially displaced and can also be rotated in the compensation cavity, and radial compensation and angle compensation can be realized simultaneously, so that the plunger can be self-adjusted in time to ensure smooth reciprocating motion.

Description

Technical Field

[0001] The invention relates to the technical field of a plunger and a crosshead component of a diaphragm compressor, and in particular to a connection structure between a plunger and a crosshead. Background Art

[0002] The plunger and crosshead are important parts of the diaphragm compressor, and the reciprocating motion of the plunger and crosshead is the main motion of the compressed gas in the diaphragm compressor. There are inevitable mechanical deviations in the design, parts processing, and equipment assembly process, so that after the diaphragm compressor is assembled, the reciprocating motion of the plunger and crosshead has axial and angular deviations. After long-term movement, the plunger, cylinder sleeve, crosshead, and slideway are seriously worn, affecting the service life of its core components and reducing the working efficiency of the diaphragm compressor.

[0003] The existing plunger structure uses bolts to connect the plunger and the crosshead, which is a rigid connection, and the plunger cannot adjust its posture. Because there are machining errors and assembly errors in the workpiece, the actual reciprocating posture of the plunger is not completely vertical, but has a certain angle. The plunger of the existing structure cannot adjust the angle during reciprocating motion, so it will cause motion interference between the plunger and the cylinder sleeve, and the plunger cannot smoothly realize the oil replenishment action. Summary of the invention

[0004] To this end, the present invention provides a connection structure between a plunger and a crosshead to solve the problem that the plunger of the existing diaphragm compressor cannot adjust its posture and thus cannot move smoothly.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A connection structure between a plunger and a crosshead comprises a plunger, a crosshead, an upper compensation block and a lower compensation block, wherein the lower end of the plunger has a disc-shaped structure, the upper part of the crosshead has a compensation cavity, the upper wall of the compensation cavity has a first through hole, the plunger passes through the first through hole, the upper compensation block, the lower compensation block and the disc-shaped structure are located in the compensation cavity, the upper compensation block is located on the upper side of the disc-shaped structure, the lower compensation block is located on the lower side of the disc-shaped structure, a radial gap is provided between the outer wall of the plunger and the inner wall of the first through hole, an axial gap is provided between the upper compensation block and the upper wall of the compensation cavity, a radial gap is provided between the upper compensation block and the side wall in the compensation cavity, a radial gap is provided between the lower compensation block and the side wall in the compensation cavity, and a radial gap is provided between the disc-shaped structure and the side wall in the compensation cavity.

[0007] Furthermore, the upper wall of the compensation cavity is a connecting plate, and the connecting plate and the side wall of the compensation cavity are detachably connected.

[0008] Furthermore, the lower side surface of the upper compensation block and the upper side surface of the disc-shaped structure are angle compensation mating surfaces, the upper side surface of the lower compensation block and the lower side surface of the disc-shaped structure are angle compensation mating surfaces, the upper side surface of the upper compensation block and the upper side surface of the compensation cavity are radial compensation mating surfaces, and the lower side surface of the lower compensation block and the lower side surface of the compensation cavity are radial compensation mating surfaces.

[0009] Furthermore, the angular compensation fitting surface and the radial compensation fitting surface are provided with lubricating oil.

[0010] Furthermore, the upper compensation block is an annular structure with a second through hole in the center of the annular structure, the plunger passes through the second through hole, there is a gap between the inner circumferential surface of the upper compensation block and the outer 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 and the upper side surface of the disc-shaped structure are slidingly fitted, 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 and the lower side surface of the disc-shaped structure are slidingly fitted.

[0011] Furthermore, the material of the upper compensation block and the lower compensation block is ductile iron.

[0012] Further, the gap between the upper compensation block and the upper wall of the compensation cavity is 0.1-0.3 mm.

[0013] Further, the roughness of the lower side surface of the upper compensation block, the upper side surface of the disc-shaped structure, the upper side surface of the lower compensation block and the lower side surface of the disc-shaped structure is less than Ra0.4.

[0014] Furthermore, the fit rate between the lower side of the upper compensation block and the upper side of the disc-shaped structure is above 70%, and the fit rate between the upper side of the lower compensation block and the lower side of the disc-shaped structure is above 70%.

[0015] Further, the edges of the upper compensation block and the lower compensation block have rounded corners, and the edge of the disc-shaped structure has rounded corners.

[0016] The present invention has the following advantages: since the upper compensation block, the lower compensation block and the disc-shaped structure have a radial gap with the side wall of the compensation cavity in the radial direction, and there is a radial gap between the outer wall of the plunger and the inner wall of the first through hole, the plunger can be radially displaced to achieve radial compensation, and the upper compensation block also has an axial gap with the upper wall of the compensation cavity in the axial direction, the plunger can rotate in the compensation cavity, and radial compensation and angle compensation can be achieved at the same time, so that the plunger can self-adjust in time, and the requirements for processing and assembly are reduced, thereby ensuring smooth reciprocating motion and smooth oil replenishment, and reducing the failure rate of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0018] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0019] Figure 1 A schematic diagram of a partial structure of a connection structure between a plunger and a crosshead provided in a specific embodiment of the present invention;

[0020] Figure 2 A schematic diagram of the overall structure of a connection structure between a plunger and a crosshead provided in a specific embodiment of the present invention;

[0021] Figure 3 A schematic diagram of a connection structure between a plunger and a crosshead provided in a specific embodiment of the present invention when radial compensation is achieved;

[0022] Figure 4 A schematic diagram of a connection structure between a plunger and a crosshead provided in a specific embodiment of the present invention for achieving radial compensation and angular compensation at the same time.

[0023] In the figure: 1- plunger; 2- crosshead; 3- compensation chamber; 4- first through hole; 5- upper compensation block; 6- lower compensation block; 7- connecting plate; 8- second through hole; 9- upper slideway; 10- lower slideway; 11- disc structure. DETAILED DESCRIPTION

[0024] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The terms such as "upper", "lower", "left", "right", "middle", etc. cited in this specification are only for the convenience of description and are not intended to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be regarded as within the scope of implementation of the present invention without substantially changing the technical content.

[0026] like Figure 1 As shown, a specific embodiment of the present invention provides a connection structure between a plunger 1 and a crosshead 2, comprising a plunger 1, a crosshead 2, an upper compensation block 5 and a lower compensation block 6, the lower end of the plunger 1 having a disc-shaped structure 11, the upper part of the crosshead 2 having a compensation chamber 3, the upper wall of the compensation chamber 3 having a first through hole 4, the plunger 1 passing through the first through hole 4, the upper compensation block 5, the lower compensation block 6 and the disc-shaped structure 11 being located in the compensation chamber 3, the upper compensation block 5 being located on the upper side of the disc-shaped structure 11, the lower compensation block 6 being located on the lower side of the disc-shaped structure 11, a radial gap being provided between the outer wall of the plunger 1 and the inner wall of the first through hole 4, an axial gap being provided between the upper compensation block 5 and the upper wall of the compensation chamber 3, a radial gap being provided between the upper compensation block 5 and the side wall in the compensation chamber 3, a radial gap being provided between the lower compensation block 6 and the side wall in the compensation chamber 3, and a radial gap being provided between the disc-shaped structure 11 and the side wall in the compensation chamber 3.

[0027] Since the upper compensation block 5, the lower compensation block 6 and the disc-shaped structure 11 have a radial gap with the side wall of the compensation chamber 3 in the radial direction, and there is a radial gap between the outer wall of the plunger 1 and the inner wall of the first through hole 4, the plunger 1 can be radially displaced to achieve radial compensation. The upper compensation block 5 also has an axial gap with the upper wall of the compensation chamber 3 in the axial direction. The plunger 1 can rotate in the compensation chamber 3 and can achieve radial compensation and angular compensation at the same time, so that the plunger can self-adjust in time, and the requirements for processing and assembly are reduced, thereby ensuring smooth reciprocating motion and smooth oil replenishment, thereby reducing the failure rate of the equipment.

[0028] It should be noted that the radial clearance, axial clearance and angular dimensions in the figures have been enlarged and replaced with letters and numbers for the purpose of simplicity and ease of understanding.

[0029] In an optional embodiment, the upper wall of the compensation chamber 3 is a connecting plate 7, and the connecting plate 7 and the side wall of the compensation chamber 3 are detachably connected. Specifically, the connecting plate 7 is connected to the side wall of the compensation chamber 3 by bolts, which is convenient for installation and disassembly and maintenance.

[0030] In an optional embodiment, the lower side of the upper compensation block 5 and the upper side of the disc-shaped structure 11 are angle compensation matching surfaces, the upper side of the lower compensation block 6 and the lower side of the disc-shaped structure 11 are angle compensation matching surfaces, the upper side of the upper compensation block 5 and the upper side of the compensation cavity 3 are radial compensation matching surfaces, the lower side of the lower compensation block 6 and the lower side of the compensation cavity 3 are radial compensation matching surfaces, and the angle compensation matching surfaces and radial compensation matching surfaces have lubricating oil. Ensure that the movement of each matching surface is smoother and reduce excessive friction.

[0031] In an optional embodiment, the upper compensation block 5 is an annular structure, the center of the annular structure has a second through hole 8, the plunger 1 passes through the second through hole 8, there is a gap between the inner circumference of the upper compensation block 5 and the outer side wall of the plunger 1, the lower side of the upper compensation block 5 is a spherical surface, the upper side of the disc-shaped structure 11 is a spherical surface, the lower side of the upper compensation block 5 and the upper side of the disc-shaped structure 11 are slidingly matched, the upper side of the lower compensation block 6 is a spherical surface, the lower side of the disc-shaped structure 11 is a spherical surface, and the upper side of the lower compensation block 6 and the lower side of the disc-shaped structure 11 are slidingly matched. When designing, the curvature of the spherical surface should be as large as possible, so that sufficient tangential force can be generated during use, which helps the spherical surface to slide and the angle compensation is more sensitive.

[0032] like Figure 2 and Figure 3 As shown, 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 and there is no angular error, radial compensation can be achieved by relying on the relative sliding between the lower end surface of the lower compensation block 6 and the upper end surface of the crosshead 2. At this time, the radial clearance on the left side of the plunger 1 is greater than the radial clearance on the right side of the plunger 1, and the radial positions of the plunger 1, the upper compensation block 5 and the lower compensation block 6 change, thereby realizing the radial compensation function.

[0033] like Figure 4 As shown, when the crosshead 2 and the plunger 1 move upward together, assuming that there is an angular error between the center lines of the upper slideway 9 and the lower slideway 10, the angle compensation can be achieved by relying on 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 clearance on the upper side of the upper compensation block 5 becomes smaller, the radial clearance on the left side of the upper compensation block 5 is smaller than the radial clearance on the right side, and the radial clearance on the left side of the lower compensation block 6 is larger than the radial clearance on the right side, thereby realizing the angle compensation and radial compensation functions.

[0034] When the crosshead drive mechanism moves downward, the upper compensation block takes effect, and the principle is the same as when it moves upward. When the crosshead 2 and the plunger 1 move downward together, assuming that the center lines of the upper slideway 9 and the lower slideway 10 are parallel and there is no angular error, radial compensation can be achieved by the relative sliding between the upper end surface of the upper compensation block 5 and the upper wall in the compensation cavity 3. When the crosshead 2 and the plunger 1 move downward together, assuming that there is an angular error in the center lines of the upper slideway 9 and the lower slideway 10, angle compensation can be achieved by the relative sliding between the spherical surface at the lower end of the upper compensation block 5 and the spherical surface at the upper end of the plunger 1.

[0035] In an optional embodiment, the upper compensation block 5 and the lower compensation block 6 are made of ductile iron, which has strong compressive strength, excellent wear resistance and self-lubricating properties.

[0036] In an optional embodiment, the gap between the upper compensation block 5 and the upper wall of the compensation cavity 3 is 0.1-0.3 mm. During design, a reasonable compensation angle that meets the functional requirements can be selected based on the actual product structure. However, the axial gap should not be too large. If the axial gap is too large, it will easily generate a large axial impact load, which will affect the reliability of the product. Preferably, it is 0.2 mm.

[0037] In an optional embodiment, the roughness of the lower side of the upper compensation block 5 , the upper side of the disk-shaped structure 11 , the upper side of the lower compensation block 6 , and the lower side of the disk-shaped structure 11 is not higher than Ra0.4.

[0038] In an optional embodiment, the fit rate between the lower side of the upper compensation block 5 and the upper side of the disc-shaped structure 11 is above 70%, and the fit rate between the upper side of the lower compensation block 6 and the lower side of the disc-shaped structure 11 is above 70%.

[0039] In an optional embodiment, the edges of the upper compensation block 5 and the lower compensation block 6 have rounded corners, and the edges of the disc-shaped structure 11 have rounded corners, so as to avoid indentations when subjected to force and reduce the impact on the relative slip between the compensation surfaces.

[0040] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A connection structure between a plunger (1) and a crosshead (2), characterized in that: The invention comprises a plunger (1), a crosshead (2), an upper compensation block (5) and a lower compensation block (6), wherein the lower end of the plunger (1) has a disc-shaped structure (11), the upper part of the crosshead (2) has a compensation cavity (3), the upper wall of the compensation cavity (3) has a first through hole (4), the plunger (1) passes through the first through hole (4), the upper compensation block (5), the lower compensation block (6) and the disc-shaped structure (11) are located in the compensation cavity (3), the upper compensation block (5) is located on the upper side of the disc-shaped structure (11), and the The lower compensation block (6) is located at the lower side of the disc-shaped structure (11); a radial gap is provided between the outer wall of the plunger (1) and the inner wall of the first through hole (4); an axial gap is provided between the upper compensation block (5) and the upper wall of the compensation cavity (3); a radial gap is provided between the upper compensation block (5) and the side wall inside the compensation cavity (3); a radial gap is provided between the lower compensation block (6) and the side wall inside the compensation cavity (3); and a radial gap is provided between the disc-shaped structure (11) and the side wall inside the compensation cavity (3); The lower side surface of the upper compensation block (5) and the upper side surface of the disc-shaped structure (11) are angle compensation matching surfaces, the upper side surface of the lower compensation block (6) and the lower side surface of the disc-shaped structure (11) are angle compensation matching surfaces, the upper side surface of the upper compensation block (5) and the upper side surface of the compensation cavity (3) are radial compensation matching surfaces, and the lower side surface of the lower compensation block (6) and the lower side surface of the compensation cavity (3) are radial compensation matching surfaces; The upper compensation block (5) is an annular structure, the center of the annular structure has a second through hole (8), the plunger (1) passes through the second through hole (8), there is a gap between the inner circumferential surface of the upper compensation block (5) and the outer side wall of the plunger (1), the lower side surface of the upper compensation block (5) is a spherical surface, the upper side surface of the disc-shaped structure (11) is a spherical surface, the lower side surface of the upper compensation block (5) and the upper side surface of the disc-shaped structure (11) are slidably matched, the upper side surface of the lower compensation block (6) is a spherical surface, the lower side surface of the disc-shaped structure (11) is a spherical surface, the upper side surface of the lower compensation block (6) and the lower side surface of the disc-shaped structure (11) are spherically matched; The upper wall of the compensation cavity (3) is a connecting plate (7), and the connecting plate (7) and the side wall of the compensation cavity (3) are detachably connected.

2. The connection structure of the plunger (1) and the crosshead (2) according to claim 1, characterized in that: The angular compensation fitting surface and the radial compensation fitting surface are provided with lubricating oil.

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

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

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

4.

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

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

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