RU2463477C1 - Displacement compressor - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: compressor comprises pistons displacing in their appropriate cylinders to make working chambers. Pistons are rigidly coupled by reciprocating tie rod and articulated with drive mechanism made up of crank-and-rocker mechanism including crank, tie rod and rocker. Valve timing elements are arranged on cylinders and made up of valves. Nut is rigidly fixed on rocker. Tie rod represents s screw with partially cut multistart thread to make screw-nut gear together with nut.

EFFECT: reduced lateral forced acting on piston and friction forces in sleeve assembly.

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Description

The invention relates to the field of volumetric action machines and can be used to create reciprocating compressors operating by changing the volume of the working cavity.

Known machine volumetric action [patent No. 2334877], containing at least one piston and two cranks, which are installed in the groove of the drive mechanism connected to the piston, each crank connected to its own engine having a drive shaft with which the crank is connected. Both engines have a common single body, the shaft of one engine has a through hole through which the shaft of the second engine passes.

The disadvantages of the analogue include:

- increased overall dimensions, due to the presence in the design of the second engine and the second crank;

- a constant length of the stroke of the pistons, determined by the double length of the crank;

- insufficient reduction of lateral forces acting on the piston and leading to its wear, due to the impossibility of absolute synchronization of the engines, which leads to a warp of the wings.

Known piston compressor volumetric action, comprising a housing, a crank-slide drive mechanism, a cylinder mounted in a housing in which a cylindrical piston is placed with the ability to move, forming one or more working chambers with the walls of the cylinder. The piston is connected to the drive mechanism. On the cylinder are gas distribution bodies in the form of self-acting valves that interact with the gas in the cylinders of the working chambers [Reciprocating compressors: Textbook. a manual for students of the specialty "Refrigeration and compressor machines and units" / B. S. Fotin, I. B. Pirumov, I. K. Prilutsky, P. I. Plastilin; under the general. ed. B.S. Fotina. - L .: Mechanical engineering. Leningra. Department, 1987. - S.4-7].

The disadvantages of this compressor are:

- increased overall dimensions due to the presence of a crank-slide mechanism;

- a constant length of the stroke of the pistons, determined by the double length of the crank;

- lateral forces acting on the piston and leading to its wear, due to the design features of the crank-slide mechanism.

Known machine volumetric action [Smelyagin A.I. Theory of mechanisms and machines. Course design: Textbook. - M .: INFRA-M; Novosibirsk: NSTU Publishing House, 2006. - P.244-245.], Containing a four-link hinge (crank-beam mechanism), to the beam of which a beam-slide mechanism with pistons that move in cylinders that are simultaneously guiding is attached.

By the greatest number of similar features, this volumetric action machine is a prototype. The disadvantages of the prototype include:

- increased weight and size indicators, due to the presence in the design of an additional rocker-slide mechanism;

- the presence of lateral forces acting on the pistons and leading to their wear, due to the structural features of the rocker-connecting rod mechanism.

The objective of the invention is to provide a volumetric compressor with improved characteristics.

The technical result is the elimination of lateral forces acting on the piston, the reduction of friction forces arising in the cylinder-piston group, and the reduction in the material consumption of the machine.

The technical result is achieved by a volumetric compressor containing pistons mounted to move in their cylinders to form working chambers, the pistons are rigidly connected to each other by a rod reciprocating, and connected to the drive mechanism in the form of a crank mechanism containing a crank, a connecting rod and rocker arm, and on the cylinders are gas distribution bodies in the form of valves, a nut fixedly mounted on the rocker arm. A rod made in the form of a screw with partially threaded multi-threading forms a screw-nut transmission with a nut.

The proposed volumetric compressor is compact by replacing the additional rocker-slide mechanism with a screw-nut transmission, which is designed so that a rod with a variable profile into which the thread is partially cut (multi-thread) is inserted into the nut fixedly connected to the beam. The use of a screw-nut transmission will eliminate lateral forces acting on the piston and leading to its wear. The reduction of friction forces occurs due to the replacement of an additional rocker-slide mechanism with a rod with a variable profile. The reduction of overall dimensions is achieved through the use of screw-nut transmission (ball screw transmission).

The drawing shows a General view of the compressor volumetric action. The compressor contains: a four-link articulated joint consisting of a crank 1, a connecting rod 2, a rocker 3, a nut 4 fixedly connected to the beam, into which a rod 5 with a variable profile with partially threaded thread (multi-start), a guide 6. is inserted. The rod with a variable profile performs the function a screw, at the ends of which pistons (diaphragms) 7 and 8 are fixed, which reciprocate in the cylinders 9 and 10, in which the discharge valves 11, 12 and the suction valves 13, 14 are installed.

The proposed compressor volumetric action is as follows.

When the crank 1 rotates, the links 2 and 3 of the articulated four link come into motion, and the link 3 makes a reverse-rotational movement. At the same time, in the nut 4, fixedly connected to the beam 3, the rod 5 is moved with a threaded thread, acting as a screw having a variable profile with a partially threaded thread (multi-thread) and moving reciprocatingly in the guide 6. The reciprocating movement of the rod drives pistons (diaphragms) 7 and 8 moving in cylinders 9 and 10. The movement of pistons 7 and 8 in cylinders 9 and 10, respectively, changes the volume of gas in the working chamber, which leads to the opening (closing) of pressure valves 11 and 12 and suction valves 13 and 14, respectively.

Claims (1)

A volumetric compressor containing pistons mounted to move in their cylinders to form working chambers, the pistons are rigidly connected to each other by a reciprocating rod and connected to a drive mechanism in the form of a crank-beam mechanism containing a crank, connecting rod and rocker and on the cylinders are gas distribution bodies in the form of valves, characterized in that it further comprises a nut fixedly mounted on the beam, and the rod is made in the form of a screw with frequent Normally the cut multiple threads and forms a transmission nut screw-nut.

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