Connecting structure of crosshead and piston rod

Abstract

The utility model discloses a connecting structure of a crosshead and a piston rod, which comprises a crosshead part and the piston rod, the piston rod is inserted into the crosshead part, the end part of the crosshead part is screwed with a crosshead nut, and a screw is fixedly assembled in the crosshead nut. Compared with a traditional connection mode, the structure redesigns the crosshead nut, the crosshead nut is fastened through the screw, the screw is mainly used for fastening to enable threads of the crosshead nut to slightly and elastically deform to achieve locking, the structure is simple, and operation is convenient and reliable. The whole connecting structure is easy to machine and assemble, the piston rod and the crosshead structure do not need to be modified, special tools do not need to be added either, cost is low, meanwhile, when the piston rod and the crosshead are detached and maintained, the crosshead nut is easier and more convenient to detach, and maintenance time is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, and particularly relates to a connecting structure between a crosshead and a piston rod. Background Art

[0002] In small and medium-sized reciprocating piston compressors, the connection between the piston rod and the crosshead mostly adopts a connection method of thread plus mating connection. This connection structure is relatively simple and easy to disassemble and assemble. However, when using this connection method for installation, the locking of the nut often adopts the form of flanging of a metal gasket. This locking method is not only troublesome for the disassembly and assembly process of the nut, wastes a lot of time when disassembling and repairing the piston rod and the crosshead, but also requires replacing the gasket for locking the nut after the repair is completed, resulting in waste of resources. For this reason, we propose a connecting structure between a crosshead and a piston rod. Content of the Utility Model

[0003] The purpose of the utility model is to provide a connecting structure between a crosshead and a piston rod to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A connecting structure between a crosshead and a piston rod, including a crosshead component and a piston rod. The piston rod is inserted into the crosshead component, and a crosshead nut is screwed at the end of the crosshead component. A screw is fixedly assembled in the crosshead nut;

[0005] A screw hole and a screw assembly hole are provided in the crosshead nut, and a fastening opening is provided on the side wall of the crosshead nut.

[0006] Preferably, an annular groove is provided on the inner side wall of the screw hole, and the position of the annular groove corresponds to that of the fastening opening.

[0007] Preferably, the size of the aperture D of the screw hole is 30 - 39 mm.

[0008] Preferably, the size of the aperture d of the screw assembly hole is 8 - 10 mm.

[0009] Preferably, the size of the width H of the fastening opening is 1 - 1.5 mm.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows: A connecting structure between a crosshead and a piston rod. Compared with the traditional connection method, this structure redesigned the crosshead nut and uses screws to fasten it. Mainly, the screw fastening causes slight elastic deformation of the threads of the crosshead nut to achieve locking. The structure is simple, the operation is convenient and reliable. The overall connection structure is easy to process and assemble without modifying the structures of the piston rod and the crosshead, and no special tools are required, so the cost is relatively low. At the same time, when disassembling and repairing the piston rod and the crosshead, the disassembly process of the crosshead nut is more convenient, saving maintenance time. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic structural diagram of the present utility model.

[0012] Figure 2 It is a schematic structural diagram of the crosshead nut of the present utility model.

[0013] In the figure: 1, crosshead nut; 11, screw hole; 12, annular groove; 13, fastening opening; 14, screw assembly hole; 2, screw; 3, crosshead component; 4, piston rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model.

[0015] Please refer to Figure 1 and Figure 2 , the present utility model provides a technical solution: A connecting structure between a crosshead and a piston rod, including a crosshead component 3 and a piston rod 4. The end of the piston rod 4 is inserted into the crosshead component 3, and a crosshead nut 1 is screwed at the end of the crosshead component 3. The crosshead nut 1 is located at the connection between the crosshead component 3 and the piston rod 4. The piston rod 4 and the crosshead component 3 are connected and fixed by the crosshead nut 1. A screw 2 is screwed into the crosshead nut 1 to lock the crosshead nut 1 and fix the crosshead nut 1. By using this connection structure to replace the traditional locking form of the nut by flanging the metal gasket, not only does it not require regular replacement of the gasket, but also the disassembly and assembly operations of the nut are simpler and more convenient.

[0016] Such as Figure 1 and Figure 2As shown in the figure, a threaded hole 11 is provided at the center of the crosshead nut 1. An annular groove 12 is provided in the threaded hole 11. A fastening opening 13 is cut on the side wall of the crosshead nut 1. A screw assembly hole 14 is provided in the crosshead nut 1. The cutting position of the fastening opening 13 corresponds to the position of the annular groove 12. The screw assembly hole 14 is used for the assembly and fixation of the screw 2. By screwing the screw 2 into the screw assembly hole 14, the end of the crosshead nut 1 generates slight elastic deformation along the fastening opening 13, so that the crosshead nut 1 fits more closely with the end of the crosshead component 3, and locks the fixed position of the crosshead nut 1.

[0017] The function of the annular groove 12 is to prevent residual deformation of the thread located in the threaded hole 11 at the edge of the fastening opening 13 during the cutting of the fastening opening 13, so as to avoid rotational obstacles during the subsequent assembly of the crosshead nut 1. The setting of the fastening opening 13 enables slight deformation to occur at the rear part of the crosshead nut 1 during the fastening process of the screw 2.

[0018] As Figure 2 shown in the figure, the aperture D of the threaded hole 11 is 30 - 39 mm, the aperture d of the screw assembly hole 14 is 8 - 10 mm, and the width H of the fastening opening 13 is 1 - 1.5 mm. This structure is mainly applicable to the connection and fixation of the piston rod 4 and the crosshead component 3 in medium and small reciprocating piston compressors.

Claims

1. A connection structure between a crosshead and a piston rod, comprising a crosshead component (3) and a piston rod (4), wherein the piston rod (4) is inserted into the crosshead component (3), and is characterized in that: A cross head nut (1) is threadedly connected to the end of the cross head component (3), and a screw (2) is fixedly assembled inside the cross head nut (1); A screw hole (11) and a screw assembly hole (14) are provided in the cross head nut (1), and a fastening opening (13) is provided on the side wall of the cross head nut (1).

2. A connection structure between a crosshead and a piston rod according to claim 1, characterized in that: An annular groove (12) is provided on the inner side wall of the screw hole (11), and the annular groove (12) corresponds to the position of the fastening opening (13).

3. The connection structure between a crosshead and a piston rod according to claim 1, characterized in that: The size of the hole diameter D of the screw hole (11) is 30-39 mm.

4. The connection structure between a crosshead and a piston rod according to claim 1, characterized in that: The size of the hole diameter d of the screw assembly hole (14) is 8 to 10 mm.

5. The connection structure between a crosshead and a piston rod according to claim 1, characterized in that: The width H of the fastening opening (13) is 1 to 1.5 mm.

Images