Reciprocating piston compressor cylinder cover necking rod type elastic double-end stud

Abstract

The utility model provides a necking rod type elastic double-end stud for a cylinder cover neck of a reciprocating piston compressor, and aims to solve the technical problem that the double-end stud is easy to break. The utility model has the key points that the two ends of a polished rod are respectively provided with a cylinder side screw and a nut side screw, the sectional area of the polished rod is 90% of the sectional area of the core part of the screw, and a necking transition part is formed at the joint of the polished rod and the screw so as to reduce the stress concentration of a single parameter; the length of the nut side screw rod is the same as that of the cylinder body side screw rod, that is, the two screw rods are both short screw rods, so that the length of the polish rod is increased when the length of the double-end stud is not changed, and the elastic deformation of the polish rod is increased.

Description

Technical Field

[0001] The utility model relates to a stud used for installing a cylinder head on a reciprocating piston compressor. Background Art

[0002] The cylinder head on a reciprocating piston compressor is installed using a stud. The characteristics of this stud are that the two screw rods at both ends of the smooth rod have different lengths. When installing, the short screw rod (the screw rod on the cylinder block side) of the stud is screwed into the cylinder block, and the fastening nut is screwed onto the long screw rod (the screw rod on the nut side); the cross-sectional area of the smooth rod is the same as the cross-sectional area of the core of the screw rod (a single parameter), that is, the cross-sectional areas of the smooth rod, the core of the screw rod on the cylinder block side, and the core of the screw rod on the nut side are the same. Since there is a long screw rod in this stud and the length of the stud is fixed, the length of the smooth rod will be shorter, equivalent to the length of the short screw rod, and the long screw rod has the longest length among the smooth rod and the two screw rods. During the operation of the reciprocating piston compressor, the stud often breaks, and the breakage mostly occurs at the root of the screw rod, that is, at the junction of the smooth rod and the screw rod. Summary of the Invention

[0003] Through analysis and experiments, it is found that the reason for the above-mentioned stud breakage is that due to the too short length of the smooth rod, the flexibility of the smooth rod decreases, and during the operation of the reciprocating piston compressor, the alternating load generated is concentrated at the root of the screw rod with a single parameter. To solve the above technical problems, the purpose of the utility model is to provide a necked rod type elastic stud for the cylinder head of a reciprocating piston compressor.

[0004] The purpose of the utility model is achieved as follows: The two ends of the smooth rod are respectively the screw rod on the cylinder block side and the screw rod on the nut side. Its characteristics are: (1) The smooth rod is made thinner, that is, the cross-sectional area of the smooth rod is 90% of the cross-sectional area of the core of the screw rod (referring to the screw rod on the cylinder block side and the screw rod on the nut side), and a necked transition part is formed at the junction of the smooth rod and the screw rod to reduce the stress concentration caused by a single parameter; (2) The smooth rod is made longer, and the length of the screw rod on the nut side is the same as the length of the screw rod on the cylinder block side, that is, both screw rods are short screw rods. In this way, when the length of the stud remains unchanged, the length of the smooth rod is increased to increase the elastic deformation of the smooth rod.

[0005] Compared with the prior art, the positive effect of the utility model is: The stress is dispersed, the service life of the stud is improved, and the safety of the reciprocating piston compressor during operation is increased. Brief Description of the Drawings

[0006] The following further illustrates the utility model with reference to the drawings.

[0007] Figure 1 It is a schematic diagram of the utility model. Detailed Embodiment

[0008] The two ends of the polished rod 3 are respectively the cylinder-side screw rod 1 and the nut-side screw rod 4. The cross-sectional area of the polished rod is 90% of the cross-sectional area of the core of the screw rod. A necking transition part 2 is formed at the joint between the polished rod and the top of the screw thread of the screw rod to reduce the stress concentration of a single parameter. The length of the nut-side screw rod 1 is the same as that of the cylinder-side screw rod 4, that is, both screw rods are short screw rods. In this way, when the length of the stud remains unchanged, the length of the polished rod is increased to increase the elastic deformation of the polished rod.

Claims

1. A reciprocating piston compressor cylinder head necked rod type elastic double-headed stud, the two ends of the polished rod are respectively a cylinder side screw and a nut side screw, and its characteristics are: The cross-sectional area of ​​the polished rod is 90% of the cross-sectional area of ​​the screw core, and a necking transition portion is formed at the junction of the polished rod and the screw to reduce the stress concentration of a single parameter; the length of the screw on the nut side is the same as that on the cylinder side, that is, both screws are short screws.

2. The necked rod type elastic stud bolt for a cylinder head of a reciprocating piston compressor according to claim 1, characterized in that: The necking transition portion is formed at the junction of the polished rod and the screw rod, which means that the necking transition portion is formed at the junction of the polished rod and the top of the screw thread.

Images