RU174869U1 - DEVICE FOR REGULATING PISTON COMPRESSOR PERFORMANCE - Google Patents

Abstract

The utility model relates to reciprocating compressors. In the device for regulating the performance of the additional cavity 2 and the working cavity 4 of the cylinder are communicated through the hole 5 in the cover 3 and installed in the housing 1 of the valve seat 6 and the movable locking element 7 of the valve. At the free end of the housing 1, a pneumatic membrane mechanism 8 is installed, containing an elastic membrane 9 and a support disk 11. A cylindrical cup 15 is inseparably connected with the valve seat 6 by radial ribs 14, in which the internal cavity 16 is open from the side of the locking element 7, and in the locking element 7 a cylindrical socket 17 is made along its axis in the return cup 15. A screw compression spring 18 is installed in the inner cavity 16. The movable locking element 7 is connected to the support disk 11 by the rod 19 and simplifies the design and increasing the reliability of the device, as well as improving the accuracy of pairing of the movable locking element 7 with the valve seat 6.

Description

Technical field

The claimed technical solution relates to reciprocating compressors and can be used in compressor engineering.

State of the art

A device for regulating the performance of a reciprocating compressor, comprising an additional volume chamber communicated by means of a shut-off element having a control cavity and a cylinder working cavity, and supply and discharge pipelines of the control medium connected respectively to the working cavity of the cylinder and the suction pipe of the cylinder and equipped with regulators (ed. St. USSR No. 1160109 A1, IPC F04B 49/02, 1985, [1]). In the known device, the control medium supply pipe is equipped with inlet and outlet discharge valves, which complicates the device.

Closest to the proposed is a known device for regulating the performance of a reciprocating compressor, containing an additional cavity of constant volume, reported by means of a shut-off valve installed in it with a working cavity of the cylinder, while the shut-off valve is equipped with a guide and a pneumatic membrane-spring actuator connected by a rod to a movable shut-off valve a valve member adapted to mate with the valve seat, and the actuator comprises a diaphragm mechanism and a return spring (.. Reciprocating compressors Theory, design and design principles Frenkel MI - 3rd edition, revised and enlarged -... P .: Engineering, 1969, pp 587-592 [2].). In the known device, the guide is made to interact with the rod and is placed between the membrane-spring actuator and the movable locking element of the valve, and a return spring of the specified actuator is placed between the guide and the supporting disk of the membrane.

In the known device, the movable locking element is fixed to the rod cantilever, and to ensure the accuracy of the pairing of this movable element with the valve seat, increased demands are placed on the rigidity of the actuator design and on the accuracy of assembly, which leads to the complexity of the device. In this case, deformations that occur during operation, for example, in the fastening of a membrane-spring drive, lead to a deviation of the movable locking element from a predetermined position, coaxial with the valve seat, as a result of which the known device has insufficient reliability.

The technical problem, the solution of which is provided during the implementation of the technical solution, is the need to simplify the design and increase the reliability of the device for regulating the performance of the reciprocating compressor, as well as the need to expand the arsenal of technical equipment for this purpose.

Disclosure of the essence of the technical solution.

The technical result in the implementation of the utility model is to simplify the design and increase the reliability of the device.

This result is achieved by the fact that in the known device for regulating the performance of a reciprocating compressor, containing an additional cavity of constant volume, reported by means of a shut-off valve installed in it with a working cavity of the cylinder, the shut-off valve is equipped with a guide and a pneumatic spring-loaded membrane actuator connected to movable locking element of the valve, made with the possibility of pairing with the valve seat, and the actuator contains a membrane mechanism and a return spring , according to the invention, the guide is placed on the side of the valve seat coaxially with it and is made in the form of a cylindrical cup, the internal cavity of which is open on the side of the movable locking element of the valve, while in the movable locking element along its axis, a socket responding to the specified cup is made with the possibility of interaction of the movable locking element with the specified glass on the outer cylindrical surface of the latter, and the return spring is placed in the inner cavity of the specified glass with the possibility interaction with a movable locking element.

New features characterizing the shape and placement of the guide and the shape of the movable locking element of the valve provide alignment of the moving locking element relative to the valve seat, regardless of possible inaccuracies in assembly and deformation in other components of the device, for example, in the fastening of the membrane mechanism. In this case, the rod connecting the membrane membrane mechanism with a movable locking element of the valve does not mate with any other elements of the device. In addition, in conjunction with the placement of the return spring in the inner cavity of the guide, these new features also ensure the functioning of the return spring without the need for any additional parts.

As a result, new features provide simplified design and increased reliability of the device.

In the particular case of the implementation of the utility model, the valve seat and cylindrical cup are made in one piece.

In this particular case, an additional technical result is provided: increasing the accuracy of the interface between the movable locking element and the valve seat, as well as reducing the number of parts and simplifying assembly operations.

A brief description of the drawings.

In FIG. 1 shows a device for controlling the performance of a reciprocating compressor, a longitudinal section;

in FIG. 2 is a section AA in FIG. 1, when performing a cylindrical cup and valve seat in one piece.

Implementation of a technical solution.

A device for regulating the performance of a reciprocating compressor is a housing 1 and an additional cavity of constant volume 2, in which a shut-off valve is located.

The housing 1 of the additional cavity 2 is mounted on the cover 3 of the compressor cylinder. The additional cavity 2 and the working cavity 4 of the cylinder communicate through the hole 5 in the cover 3 and installed in the housing 1 of the valve seat 6 and the movable locking element 7 of the valve. On the free end of the housing 1 along the axis of the seat 6 is installed a pneumatic membrane mechanism 8 of the valve, containing an elastic membrane 9, pinched by the cover 10 with the formation of a supmembrane cavity between them, and a support disk 11. In the cover 10, a fitting 12 is provided for connecting the supramembrane cavity to the pneumatic control system (not conventionally shown in the drawing).

The valve seat 6 is secured in the housing 1 with a press fitting, and to prevent axial displacement of the seat 6, a groove 13 is provided for the spring thrust (retaining) ring. A cylindrical valve cup 15 is connected to the valve seat 6 by radial ribs 14, in which the inner cavity 16 is open on the side of the movable locking element 7, and in the movable locking element 7 a cylindrical socket 17 is formed along its axis 17. In the inner cavity 16 of the glass 15 is installed compression coil spring 18.

The movable locking element 7 by the valve stem 19 is connected to the supporting disk 11 of the membrane mechanism 8.

The valve diaphragm 8 and the compression coil spring 18 are jointly a pneumatic spring-loaded diaphragm actuator, where the spring 18 functions as a return spring.

In the example of FIG. 2 valve seat 6, cylindrical cup 15 and radial ribs 14 connecting them are made in one piece.

Work description.

In the assembled device, the cylindrical cup 15 is partially in the socket 17 of the movable locking element 7, forming with the last translational pair, i.e. the cup 15 serves as a guide for the locking element 7 and ensures its alignment relative to the valve seat 6, regardless of possible inaccuracies in the assembly and deformations in other components of the device, for example, in the fastening of the membrane mechanism 8. The compression spring 18 is in a pre-loaded state, acting on the movable locking element 7 in the direction from the seat 6 to the membrane mechanism 8.

In the absence of pressure in the supmembrane cavity of the membrane mechanism 8, the movable locking element 7 under the influence of the spring 18 is located at a maximum distance from the seat 6, as a result of which the working cavity 4 of the cylinder communicates with the additional cavity 2, and the compressor stage operates in a mode of reduced performance.

To switch the compressor stage to the mode of operation with nominal capacity, a control gas (for example, air) is supplied into the supramembrane cavity of the membrane mechanism 8 through the nozzle 12, as a result of which the movable locking element 7 sits on the seat 6, and the additional cavity 2 is isolated from working cavity 4 cylinder. The necessary pressure of the control gas is determined by known calculation methods, from the condition that there is sufficient force on the stem to switch the valve and keep it closed when the compressor is operating.

The above examples do not exhaust the possible options for implementing the utility model. For example, other means may be used to secure the valve seat in the housing, to connect the cylindrical cup to the seat, etc.

Industrial applicability.

Examples of execution confirm the possibility of achieving the claimed technical result. EFFECT: simplified design and increased reliability of the device, as well as increased accuracy of coupling of the movable locking element with the valve seat.

INFORMATION SOURCES.

1. A. p. 1160109, MKI F04B 49/02. A device for controlling the performance of a reciprocating compressor [Text] / Prostorov I.S., Turin V.F., Serdakov M.A. (THE USSR). - No. 3625028; declared 07/21/1983; publ. 06/07/1985, Bull. No. 21.

2. Frenkel M.I. Piston compressors. Theory, design and design basics [Text] / M.I. Frenkel; - 3rd ed., Revised. and add. - P .: Engineering, 1969.

Claims (2)

1. A device for controlling the performance of a reciprocating compressor, containing an additional cavity of constant volume, communicated by means of a shut-off valve installed in it with a working cavity of the cylinder, the shut-off valve equipped with a guide and a pneumatic membrane spring actuator connected by a rod to a movable shut-off valve element made with the possibility of interfacing with the valve seat, and the actuator contains a membrane mechanism and a return spring, characterized in that the guide is placed with the orons of the valve seat are coaxial with it and made in the form of a cylindrical cup, the inner cavity of which is open on the side of the movable locking element of the valve, while in the movable locking element along its axis there is a socket corresponding to the specified cup with the possibility of the movable locking element interacting with the specified cup along the outer cylindrical the surface of the latter, and a return spring is placed in the inner cavity of the specified glass with the possibility of interaction with a movable locking element. 2. The device according to claim 1, characterized in that the valve seat and cylindrical cup are made in the form of one part.

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