RU167757U1 - PISTON DIFFERENTIAL COMPRESSOR - Google Patents

Abstract

The claimed technical solution relates to the field of compressor engineering and can be used in cylinder-piston units of reciprocating compressors. The differential compressor piston contains a rod (1), on which the piston of the junior stage (2) and the piston of the senior stage (3) are mounted. In this case, a circlip (10) is placed between the pistons (2, 3). The piston of the upper stage (3) is fixed relative to the piston of the lower stage (2) due to the fact that: - on the surface of the part of the piston of the lower stage (2) facing the piston of the upper stage (3), at least one fixing structural element is made ( 9); - on the surface of the piston of the highest stage (3), facing the piston of the lower stage (2), at least three structural locking elements (8) are made; - parts of the retaining ring (1) are fixed on the structural locking element (9) the piston of the lowest stage (2) and at least one and structural fixing elements (8) upper secondary piston (3), offset with respect to the constructive fixing element (9) youngest stage piston (2) .4 ZP f-ly, 2 ill.

Description

The field of technology.

The claimed technical solution relates to the field of compressor engineering and can be used in cylinder-piston units of reciprocating compressors.

The level of technology.

Known, for example, a composite differential piston (options 1 and 2) (RF patent No. 2511925 for the invention, IPC F04B 53/14, F16J 1/12, 2014 [1]). As in the claimed technical solution, the specified analogue [1] contains a rod with a thrust shoulder, a low pressure piston and a high pressure piston. In this case, the low pressure piston is mounted on the rod to the stop collar, and the high pressure piston is fixed to the rod on the side of the low pressure piston. A crown washer is located between the pistons.

In the analogue [1], the self-unscrewing of the high pressure piston is prevented by a crown washer.

The specified analogue [1] is the set of essential features the closest analogue of the same purpose to the claimed technical solution. Therefore, it is adopted as a prototype.

The technical problem, the solution of which is provided by the implementation of the technical solution, is that the analogue [1] of the high pressure piston is not fixed relative to the low pressure piston. The paws of the crown washer of the analogue [1] are bent to the high pressure piston.

Disclosure of the essence of the technical solution.

The technical result provided by the claimed technical solution is to increase the reliability of fixing the piston of the upper stage relative to the piston of the lower stage.

The essence of the claimed technical solution lies in the fact that the piston of the differential compressor contains a rod on which the piston of the junior stage and the piston of the senior stage are mounted. In this case, a circlip is placed between the pistons. It differs in that:

- on the surface of the piston of the junior stage, facing the piston of the senior stage, at least one structural locking element is made;

- on the surface of the piston of the senior stage, facing the piston of the younger stage, at least three structural elements of fixation are made;

- parts of the retaining ring are fixed on the structural element for fixing the piston of the lower stage and at least on one of the structural elements for fixing the piston of the upper stage, offset from the structural element for fixing the piston of the lower stage.

The above essence is a combination of essential features of the claimed technical solution, ensuring the achievement of the claimed technical result "improving the reliability of fixing the piston of the senior stage relative to the piston of the lower stage".

In special cases, it is permissible to carry out the technical solution as follows.

The fixing structural members are preferably flat sections.

The structural elements of the fixation can be a groove.

The rod is preferably a cylindrical rod, at one end of which a first threaded section is made, and at the other end a second threaded section is made.

A castellated nut is predominantly mounted on the second threaded portion of the stem. In this case, the castellated nut is recessed in the piston of the senior stage.

The author of the claimed technical solution made a prototype of this solution, the tests of which confirmed the achievement of the technical result.

A brief description of the drawings.

1 is a longitudinal sectional view of a differential piston of a compressor; FIG. 2 is a perspective view of a differential piston.

Implementation of a technical solution.

The differential piston (Fig. 1) is part of the cylinder-piston group of the second and third stages of compressor 2 VM2.5-2.5 / 18. The differential piston contains a rod (1), on which the piston of the junior stage (2) and the piston of the senior stage (3) are mounted.

The rod (1) is a cylindrical rod, at one end of which a first threaded section (4) is made, and at the other end, a second threaded section (5) is made. A thrust shoulder (6) is made between the threaded sections. The first threaded section (4) is designed to secure the rod (1) in the threaded hole of the crosshead. The thrust collar (6) is designed to hold against axial movement of the pistons placed on the rod (2, 3). A support ring (7) adjoins the thrust shoulder (6), which covers the side surface of the shoulder (6).

The piston of the junior stage (2) is designed for the second stage of compression. The piston of the lower stage (2) abuts against the support ring (7). Thanks to the support ring (7), the forces from the shoulder (6) are evenly distributed on the end surface of the piston of the lower stage (2).

The piston of the senior stage (3) is designed for the third stage of compression.

Between the pistons (2, 3) there is a circlip (10) (Fig. 2), for example a washer with folding legs. At least one structural locking element (9) is made on the surface of the piston of the lower stage (2) facing the piston of the higher stage (3). There are two structural elements of fixation (9). In this case, the structural fixing elements (9) are diametrically opposed. At least three structural fixing elements (8) are made on the piston part of the senior stage (3) facing the piston of the younger stage (2). Fixation structural elements (8, 9) are flat sections. The angle between two adjacent structural elements of fixation (8) of the piston of the senior stage (3) is obtuse.

Parts of the retaining ring (10) are fixed on the structural element of fixation (9) of the piston of the lower stage (2) and at least on one of the structural elements of fixation (8) of the piston of the upper stage (3), offset from the structural element of fixation (10) of the piston of the younger steps (2). Due to this connection, reliable fixation of the piston of the upper stage (3) relative to the piston of the lower stage (2) is ensured.

A castellated nut (11) is installed on the second threaded section (5) of the rod (1), which fixes the piston of the highest stage (3) on the rod (1). In this case, the castellated nut (11) is recessed in the piston of the senior stage (3) and fixed from self-unscrewing.

Piston rings (12, 13) are mounted on the surface of the pistons (2, 3).

Examples of specific performance.

Example 1. The piston of the senior stage (3) contains a protruding section, a middle section and a head. The protruding section is made at the end facing the piston of the lower stage (2). In this case, the structural locking elements (8) are made on the protruding section. Piston rings (12) are mounted on the head. The middle section of the piston of the senior stage (3) is elongated and has the smallest diameter.

Example 2. On the stem (1) from the side of the second threaded section (5) a keyway is made.

Example 3. Structural elements of fixation (8, 9) are grooves. The implementation of the proposed technical solution is not limited to the above examples.

Work description.

The first threaded section (4) of the rod (1) is installed in the crosshead. The support ring (7) is mounted on the stem (1) until it stops in the shoulder (6). After that, the piston of the lower stage (2) and the snap ring (10) are installed on the rod (1). Parts of the retaining ring (10) are fixed on the structural locking element (9) of the piston of the lower stage (2). Then, the piston of the senior stage (3) is installed on the rod (1). Parts of the retaining ring (10) are fixed on one of the structural fixing elements (8) of the piston of the senior stage (3). Thus, the piston of the senior stage (3) is fixed relative to the piston of the younger stage (2). A lock nut (11) is screwed onto the second threaded section (5) of the rod (1), which fixes the piston of the highest stage (3) on the rod (1).

During operation, the differential piston of the compressor performs longitudinal reciprocating movements. Alternately, the pistons (2, 3) of the senior and younger stages move to their dead points.

During the movement of each of the pistons (2, 3) of the compressor from the top dead center to the bottom dead center, gas enters the cylinder working volume through the suction valve. When the piston moves backward, the gas is compressed and exits the cylinder through the discharge valve. Next, the intake-compression cycle is repeated.

Industrial applicability.

The claimed technical solution is implemented using industrially produced devices and materials, can be manufactured at any engineering enterprise and will find wide application in the field of compressor engineering.

INFORMATION SOURCES

1. Pat. 2511925 Russian Federation, IPC F04B 53/14, F16J 1/12. Composite differential piston (options) [Text] / Emkha E.N., Voroshilov I.V .; Applicant and patent holder Krasnodar Compressor Plant Limited Liability Company - No. 2012138669/06; declared 09/10/2012; publ. 04/10/2014, Bull. No. 10.

Claims (8)

1. A differential piston of a compressor comprising a rod on which a piston of a lower stage and a piston of a higher stage are mounted, wherein a circlip is placed between the pistons, characterized in that - on the surface of the piston of the junior stage, facing the piston of the senior stage, at least one structural locking element is made; - on the surface of the piston of the senior stage, facing the piston of the younger stage, at least three structural elements of fixation are made; - parts of the retaining ring are fixed on the structural element for fixing the piston of the lower stage and at least on one of the structural elements for fixing the piston of the upper stage, offset from the structural element for fixing the piston of the lower stage. 2. The piston according to claim 1, characterized in that the structural fixing elements are flat sections. 3. The piston according to claim 1, characterized in that the structural elements of the fixation are grooves. 4. The compressor piston according to claim 1, characterized in that the rod is a cylindrical rod, at one end of which a first threaded section is made, and at the other end a second threaded section is made. 5. The compressor piston according to claim 4, characterized in that a castellated nut is installed on the second threaded portion of the stem, while the castellated nut is recessed in the piston of the upper stage.

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