CN107795573B

CN107795573B - Threaded plug-in type crosshead part fastening device

Info

Publication number: CN107795573B
Application number: CN201711085047.2A
Authority: CN
Inventors: 丁兆国
Original assignee: Bengbu Gaoke Ruili Compressor Co ltd
Current assignee: Bengbu Gaoke Ruili Compressor Co ltd
Priority date: 2017-11-07
Filing date: 2017-11-07
Publication date: 2021-04-09
Anticipated expiration: 2037-11-07
Also published as: CN107795573A

Abstract

The invention relates to the technical field of piston compressor assembly parts, in particular to a threaded plug-in type crosshead part fastening device which comprises a crosshead body, a crosshead nut and a longitudinally-arranged piston rod, wherein an upward-protruding external thread supporting ring is arranged on the upper surface of the crosshead body and positioned at the periphery of the crosshead nut. According to the threaded plug-in type crosshead component fastening device, the plug-in block is inserted into the plug-in groove, the splicing block is inserted into the splicing groove to fix the external fastening block and the external thread support ring, the external fastening block is fixed with the external thread support ring and the crosshead body through the internal thread fixing ring in threaded connection with the external thread support ring, the crosshead nut is fastened and limited by the limiting groove in the external fastening block, the problems that a piston rod is easy to loosen under the conditions of overlarge reciprocating inertia force, long working time and high working strength of a small and medium-sized compressor are solved, and the safety and the reliability of continuous working of the compressor are effectively improved.

Description

Threaded plug-in type crosshead part fastening device

Technical Field

The invention relates to the technical field of piston compressor assembly parts, in particular to a fastening device with a threaded plug-in type crosshead part.

Background

In a reciprocating compressor, a crosshead is often used to excessively connect a connecting rod and a piston rod, and the piston rod is connected to the connecting rod through the crosshead so that the piston rod is not subjected to lateral pressure caused by the connecting rod. So that the friction of the piston with the cylinder is minimal. And the crosshead and the piston rod only do axial motion, so that the volume of the cylinder can be fully utilized, the method for controlling lubricating oil is simpler, and the use efficiency of the compressor is improved.

Although the reciprocating compressor has a plurality of connection modes between the piston rod and the crosshead, most of the connection modes have the defects of large mass or complex installation, and the mass of the crosshead in the small and medium-sized compressor has great influence on the balancing of the compressor. Therefore, the connection mode with simple installation and light weight becomes the first choice of small and medium-sized compressors, and the threaded connection just meets the requirements. Therefore, the most widely used small and medium-sized compressors are threaded connections.

Usually by the piston rod in traditional threaded connection, cross head nut, two nut locking systems are constituteed to the cross head body, and install a locking gasket additional between cross head nut and cross head body, the possibility with the motion each other between cross head nut and the cross head body falls to minimumly, thereby two nut locking systems of better lock death, but the moment requirement to the nut locking is higher in two nut locking, locking torque is big, can destroy the screw thread and cause the smooth silk not hard up, locking torque can twist not tight nut for a short time and also can cause not hard up, and break curved locking gasket and let it tightly attached when on cross head nut, need use the hammer to beat, the screw thread on the nut is very probably destroyed at the in-process of beating, thereby influence the screwing up of nut.

The working time of the compressor is generally very long, the reciprocating inertia force is also relatively large, the double-nut locking system is inevitably loosened under the action of the long-time reciprocating inertia force, a piece of stop washer can prevent the cross head nut and the cross head body from moving mutually in a short time, but the stop washer can deform and lose effect under the long-time high-strength working. Once the piston rod and the crosshead are loosened, a great potential safety hazard is often generated, the cylinder is hit, unbalanced moment is generated, abrasion of the piston and the cylinder is accelerated, and the possibility of machine damage and death is severe.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: to solve the problems of the prior art, an improved fastening device with a threaded plug-in cross head member is provided.

The technical scheme adopted by the invention for solving the technical problems is as follows: a fastening device with a threaded plug-in type crosshead part comprises a crosshead body, a crosshead nut and a longitudinally arranged piston rod, wherein an upward convex external thread support ring is arranged on the periphery of the crosshead nut on the upper surface of the crosshead body, a plurality of plug-in grooves with openings at the upper ends are formed in the external thread support ring, a strip-shaped splicing groove communicated with the lower end of the plug-in groove is formed in the outer side of the external thread support ring on the upper surface of the crosshead body, external fastening blocks are arranged at the upper end of the external thread support ring corresponding to the plug-in grooves, limiting grooves matched with the outer side wall of the crosshead nut are formed in the inner side wall of each external fastening block, an integrated structure plug-in block matched with the plug-in groove is arranged at the lower end of each plug-in block, the external fastening blocks are inserted into the plug-in grooves through the lower end plug-in blocks and connected with, the outside tight splice insert the disconnected splice piece through the grafting piece and insert inside the splice groove and be connected with cross head body upper surface, the grafting piece outside be provided with the solid fixed ring of internal thread, the outside tight splice pass through the solid fixed ring threaded connection of internal thread and be connected with external thread support ring and cross head body upper surface fixed connection in the external thread support ring outside.

Furthermore, the outer side surface of the inserting block is provided with a threaded connection surface matched with the outer side of the external thread support ring.

Furthermore, the size of the inside of the splicing groove is the same as that of the splicing block.

Furthermore, no gap exists between the inner side wall of the insertion groove and the outer side contact surface of the insertion block.

Furthermore, the length of the inserting block is the same as the height of the internal thread fixing ring.

The threaded plug-in type crosshead component fastening device has the advantages that the plug-in block is inserted into the plug-in groove, the splicing block is inserted into the splicing groove to fix the external fastening block and the external thread support ring, the external fastening block, the external thread support ring and the crosshead body are fixed through the internal thread fixing ring in threaded connection with the external thread support ring, the crosshead nut is fastened and limited through the limiting groove in the external fastening block, the problems that a piston rod is easy to loosen under the conditions of overlarge reciprocating inertia force, long working time and high working strength of a small and medium-sized compressor are solved, and the safety and the reliability of continuous working of the compressor are effectively improved.

Drawings

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic structural view of the present invention.

FIG. 2 is a cross-sectional view of the position of the externally threaded support ring of the present invention.

In the drawing, 1, a crosshead body, 2, a crosshead nut, 3, a longitudinally arranged piston rod, 4, an external thread support ring, 5, an insertion groove, 6, a splicing groove, 7, an external fastening block, 8, a limiting groove, 9, an insertion block, 10, a splicing block and 11, an internal thread fixing ring.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

FIG. 1 and FIG. 2 show a threaded plug-in type crosshead part fastening device, which comprises a crosshead body 1, a crosshead nut 2 and a longitudinally arranged piston rod 3, wherein the upper surface of the crosshead body 1 is provided with an upward convex external thread support ring 4 at the periphery of the

crosshead nut

2, 3 plug-in grooves 5 with openings at the upper ends are arranged in the external thread support ring 4, a strip-shaped splicing groove 6 communicated with the lower end of the plug-in groove 5 is arranged at the outer side of the external thread support ring 4 on the upper surface of the crosshead body 1, external fastening blocks 7 are arranged at the upper ends of the external thread support ring 4 corresponding to the positions of the plug-in grooves 6, a limiting groove 8 matched with the outer side wall of the crosshead nut 2 is arranged on the inner side wall of each external fastening block 7, the lower end of each external fastening block 7 is provided with a plug-in block 9 with an integral structure, the outer fastening block 7 is inserted into the inserting groove 5 through the lower end inserting block 9 and is connected with the outer thread support ring 4, the outer fastening block 7 is inserted into the broken splicing block 10 through the inserting block 9 and is connected with the upper surface of the crosshead body 1, the inner thread fixing ring 11 is arranged on the outer side of the inserting block 9, and the outer fastening block 7 is fixedly connected with the outer thread support ring 4 and the upper surface of the crosshead body 1 on the outer side of the outer thread support ring 4 through the inner thread fixing ring 11 in a threaded connection mode.

Furthermore, the outer side surface of the inserting block 9 is provided with a threaded connection surface matched with the outer side of the external thread support ring 4, further, the inner size of the splicing groove 6 is the same as that of the splicing block 10, further, no gap exists between the inner side wall of the inserting groove 5 and the contact surface of the outer side of the inserting block 9, further, the length of the inserting block 9 is the same as that of the internal thread fixing ring 11, the threaded inserting type crosshead part fastening device provided by the invention inserts the inserting block 9 into the inserting groove 5, the splicing block 10 is inserted into the splicing groove 6 to fix the external fastening block 7 and the external thread support ring 4, the external fastening block 7 is fixed with the external thread support ring 4 and the crosshead body 1 through the internal thread fixing ring 11 in threaded connection with the external thread support ring 4, the limiting groove 8 on the external fastening block 7 is used for fastening and limiting the crosshead nut 2, and the situation that the, the problem that the piston rod is easy to loosen under the conditions of long working time and high working strength is solved, and the safety and the reliability of continuous working of the compressor are effectively improved.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. The utility model provides a plug-in type crosshead part fastener with screw thread, includes crosshead body (1), crosshead nut (2) and indulges and puts piston rod (3), characterized by: the upper surface of the crosshead body (1) is positioned at the periphery of a crosshead nut (2) and is provided with an upward convex external thread support ring (4), a plurality of insertion grooves (5) with openings at the upper ends are formed in the external thread support ring (4), the upper surface of the crosshead body (1) is positioned at the outer side of the external thread support ring (4) and is provided with a strip-shaped splicing groove (6) communicated with the lower end of the insertion groove (5), external fastening blocks (7) are arranged at the positions, corresponding to the insertion grooves (5), of the upper ends of the external thread support ring (4), limiting grooves (8) matched with the outer side wall of the crosshead nut (2) are formed in the inner side wall of each external fastening block (7), an integrated structure insertion block (9) matched with the insertion grooves (5) is arranged at the lower end of each external fastening block (7), an integrated structure splicing block (10) matched with the splicing grooves (6) is arranged at the bottom end, the outer fastening block (7) is inserted into the insertion groove (5) through a lower end insertion block (9) and is connected with the outer thread support ring (4), the outer fastening block (7) is inserted into the splicing groove (6) through a splicing block (10) at the lower end of the insertion block (9) and is connected with the upper surface of the crosshead body (1), an inner thread fixing ring (11) is arranged on the outer side of the insertion block (9), and the outer fastening block (7) is in threaded connection with the outer side of the outer thread support ring (4) through the inner thread fixing ring (11) and is fixedly connected with the outer thread support ring (4) and the upper surface of the crosshead body (1);

the outer side surface of the insertion block (9) is provided with a threaded connection surface matched with the outer side of the external thread support ring (4).

2. A fastener having a threaded plug-in cross member as defined in claim 1, wherein: the inner size of the splicing groove (6) is the same as that of the splicing block (10).

3. A fastener having a threaded plug-in cross member as defined in claim 1, wherein: and no gap is reserved between the contact surface of the inner side wall of the insertion groove (5) and the outer side of the insertion block (9).

4. A fastener having a threaded plug-in cross member as defined in claim 1, wherein: the length of the plug-in block (9) is the same as the height of the internal thread fixing ring (11).