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Threaded connecting structure of differential piston

A technology of differential piston and connection structure, applied in multi-stage pumps, variable capacity pump components, liquid variable capacity machinery, etc., can solve problems such as piston falling off, gas pressure pulsation, equipment stop

Active Publication Date: 2013-01-23
天津凯德实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The connection between the lower-pressure piston and the piston rod is usually an interference fit. Although it avoids easy falling off caused by too large a fit gap between parts or difficult assembly caused by a too small fit gap, there are also problems in the actual shrink-fitting process. Defects of harsh installation conditions: On the one hand, due to differences in the material, size, interference, heating temperature, and heating time of rigid connectors such as pistons and piston rods, the piston rods will be bent and deformed, resulting in failure or even scrapping; On the other hand, during the operation of the compressor, factors such as excessive inertial force, high cylinder operating temperature, and gas pressure pulsation will cause the piston to fall off, or even stop the operation of the equipment, resulting in certain economic losses.

Method used

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  • Threaded connecting structure of differential piston
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Embodiment Construction

[0016] Attached below figure 1 and figure 2 Specific embodiments of the present invention are further explained:

[0017] Preferably, the present invention is a threaded differential piston connection method, including a piston 1, a piston rod 2, a lock nut 3, a steel pad 4, an outer hexagonal wrench 5 and an inner hexagonal wrench 6, and it is characterized in that on the piston rod 2 The part connected with the piston 1 is provided with threads, and the lock nut 3 is provided with internal threads.

[0018] In the present invention, the design of the thread on the piston rod 2 matches the design of the internal thread on the lock nut 3, and the diameters of the two threads are equal.

[0019] In the present invention, several steel pads 4 are arranged between the piston 1 and the shaft shoulder, and between the piston 1 and the lock nut 3 .

[0020] When the piston 1 is made of steel, the steel pad 4 can be omitted between the piston 1 and the shaft shoulder, and between...

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Abstract

The invention discloses a threaded connecting structure of a differential piston used for a differential piston in a piston type compressor. The threaded connecting structure comprises a piston, a piston rod, a locknut, steel pads, an outer hexagonal wrench and an inner hexagonal wrench, and is characterized in that a part on the piston rod, which is connected with the piston, is provided with a screw thread, an internal thread is arranged in the locknut, the screw thread on the piston rod is matched with the design of an internal thread of the locknut, and the diameters are equal, and the steel pads are respectively arranged between the piston and a shaft shoulder, and between the piston and the locknut. Through the technical scheme provided by the invention, the connecting mechanism of the differential piston has the advantages of simple structure, un-harsh installation and working operation conditions, simple maintenance and adjustment, and durability.

Description

technical field [0001] The invention relates to the technical field of mechanical connection devices, in particular to a connection mechanism for differential pistons in piston compressors. Background technique [0002] At present, the differential piston structure is mostly used in the piston compressor. The common connection mode of the differential piston in the prior art is a double spherical surface floating connection or a needle bearing connection with a shaft sealing device. The patent CN1793648 compressor double-spherical floating connection structure discloses the main technical features of the double-spherical floating connection. The high-pressure piston and the low-pressure piston are rigidly connected, and the low-pressure piston rod is installed in the low-pressure piston cavity. The ball pad and the convex ball pad are set on the high-pressure piston rod to form a set of spherical surfaces, and the convex ball pad and the concave ball pad are installed in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B39/00F04B25/02
Inventor 张忠家孙艳周本汉
Owner 天津凯德实业有限公司
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