UA147475U - Reciprocating compressor - Google Patents

Abstract

A reciprocating compressor comprises a base frame which houses a crank mechanism consisting of a crankshaft adapted for connection to a motor, and connecting rods. The crankshaft is mounted in main bearings, one of which is a thrust bearing. The small ends of the connecting rods arc mounted in crossheads disposed in crosshead guides, and the big ends of the connecting rods arc connected to crankpins of the crankshaft. Compressor cylinders arc fastened in the base frame via the crosshead guides and arc connected to live crank mechanism by piston rods connected to the crossheads. The device additionally contains suction and deliver buffer tanks. In the upper portion of the base frame, between the longitudinal walls, there are mounted braces with adjustable spacers on the ends thereof, by means of which the braces are connected flush to the base frame. The crankshaft has oval journals. The thrust bearing comprises a cap having thrust half-washers mounted therein. The crosshead guides arc provided with longitudinal stiffening ribs. The rods of the compressor cylinder pistons arc connected to the crossheads by nuts and counternuts having annular grooves in the body thereof.

Description

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The utility model belongs to the field of mechanical engineering, refers to a piston compressor device designed for compression and pumping of natural and accompanying petroleum gases of various chemical compositions, which can be used to work as part of gas pumping units for pumping natural gas into underground storages, at booster compressor stations and other facilities of the gas and oil refining industry.

The closest analogue of the proposed useful model is a piston compressor protected by patent KO 2645885 C2, cl. RO4835/00, publ. 05.10.2017, accepted as the closest analog (prototype). The piston compressor on the opposed bases according to the prototype contains a frame in which the crank-connecting mechanism is placed, which consists of a crankshaft made with the possibility of connection to an electric motor, main bearings mounted on it and a connecting rod, the upper head of which is fixed in a crosshead located in guide, and the crank head is attached to the connecting rod neck of the crankshaft, and is made with the possibility of converting the rotational movement of the crankshaft into the reciprocating movement of the crosshead in the guide, and the associated rod with a piston in the cylinder connected to the crosshead guide.

The advantages and common features of the device according to the closest analog with the useful model are the increased nominal piston force of the compressor. In the device according to the prototype, the nominal piston force is tons and 25 tons, while the elements of the crank mechanism are designed for working forces of 20.0 tons and 33.5 tons, respectively, a short piston stroke of 100 or 120 mm, high revolutions from 1000 rpm . up to 1500 rpm. At the same time, an average piston speed of 3.25 m/s to 5.0 m/s is provided. This allows the use of materials that provide gas compression without lubrication of cylinders and seals at an average piston speed of up to 4.0 m/s. However, the closest analogue is not without its drawbacks: firstly, the working forces of the crank-connecting mechanism of 20.0 tons and 33.5 tons do not correspond to the effort on the compressor cylinder rod of 15 tons and 25 tons, which leads to oversizing of the compressor base and, as a consequence , to an increase in the mass and dimensions of the compressor in comparison with piston compressors, in which the force on the compressor cylinder rod corresponds to the force of the crank mechanism; secondly, due to the discrepancy between the calculated forces of the crank mechanism and the force on the compressor cylinder rod, there is no

With the possibility of increasing the power of the compressor; thirdly, due to the limitation of the calculated force on the rod of the compressor cylinder, the possibility of the crank mechanism is not fully used in relation to the pressure range of the compressed gas on the suction and discharge.

The task of the useful model is to improve the piston compressor.

The technical result of using a useful model is an expansion of the range of suction and discharge pressures, a more complete use of the compressor's power to obtain greater productivity, an increase in the safety of compressor operation with an increased effort on the rod up to 32 tons, a reduction in weight and dimensions.

The problem is solved by the fact that in the piston compressor, which contains the foundation frame, in which the crank-connecting mechanism is located, consisting of a crankshaft, made with the possibility of connection with the engine, installed in the main bearings of the frame, and connecting rods, the upper heads of which installed in the crossheads located in the guides, and the crank heads are connected to the connecting rod necks of the crankshaft, the compressor cylinders, fixed to the foundation frame through the guides of the crossheads, and connected to the crank mechanism by means of piston rods connected to crossheads, suction and discharge buffer tanks, according to a useful model, spacers with adjusting spacers at the ends are installed in the upper part of the foundation frame between the longitudinal walls, with the help of which they are connected without gaps to the foundation frame, the crankshaft is made with oval-shaped cheeks, thrust bearing contains a cover in which thrust half-rings, crosshead guides are installed iv are made with longitudinal stiffening ribs, the piston rods of the compressor cylinders are connected to the crossheads by means of nuts and locknuts made with annular grooves in the body; the foundation frame is cast from cast iron

СЧ25, in the transverse direction reinforced with ribs with a transition to support platforms; the crankshaft is installed in seven main bearings, while the second bearing from the engine side is a thrust bearing; spacers are made of rolled steel and are fixed on the frame with tension bolts; adjusting spacers are made in the form of 15 washers of the same material as the spacers, which correspond in thickness to the gap between the spacer and the longitudinal wall of the foundation frame; two half-rings are installed in the thrust bearing cover, while the thrust bearing cover is connected to the foundation frame with pins; because the special annular groove in the body of nuts and locknuts is a trapezoidal groove with rounded corners and protrusions; the reciprocating compressor contains six compressor cylinders, oppositely located relative to the foundation frame, three compressor cylinders on each side; to ensure functioning, the piston compressor additionally contains a press oil pump with a drive, an oil pump with a drive, an electric pump unit, regulating devices of compressor cylinders, a control unit for regulating devices of compressor cylinders, a shaft rotation device, pipelines.

In fig. 1 shows a side view of a piston compressor.

In fig. 2 shows a cross section of a piston compressor.

In fig. C shows the foundation frame of the piston compressor, where a is a side view, 6 is a top view, and c is a cross section.

In fig. 4 presents a cross-section of the foundation frame of the piston compressor.

In fig. 5 shows a longitudinal section of a thrust bearing with a thrust bearing cover and two half rings.

In fig. 6 shows the guide crosshead of the piston compressor, where: a - longitudinal section, b - top view.

In fig. 7 shows the crankshaft of a piston compressor, where: a - side view, b - cross section.

In fig. 8 shows the compressor cylinder of a piston compressor, where: a - longitudinal section, b - side view (left).

In fig. 9 shows a piston with a piston compressor rod.

In fig. 10 shows the nut for fastening the rod of the compressor cylinder of the piston compressor.

In fig. 11 shows the lock nut of the compressor cylinder rod of the piston compressor.

The piston compressor in fig. 1-11, which is constructively proposed, contains: 1 - foundation frame; 2 - crankshaft;

C - main bearings; 4 - thrust bearing; 5 - connecting rods;

Zo b - upper heads of connecting rods; 7 - crank heads of connecting rods; 8 - crossheads; 9 - crosshead guides; 10 - connecting rod necks of the crankshaft; 11 - compressor cylinders; 12 - compressor cylinder rods; 13 - compressor cylinder pistons; 14 - suction buffer tanks; 15 - injection buffer tanks; 16 - struts; 17 - adjusting spacers; 18 - crankshaft cheeks; 19 - thrust bearing cover; 20 - thrust half-rings; 21 - longitudinal stiffeners of guide crossheads; 22 - nuts; 23 - lock nuts.

To ensure functioning, the reciprocating compressor additionally contains: an oil press pump with a drive; oil pump with drive; electric pump unit, regulating devices of compressor cylinders 11, control unit for regulating devices of compressor cylinders; shaft turning device, pipelines. The proposed reciprocating compressor is a horizontal six-row, containing six compressor cylinders 11, located oppositely relative to the foundation frame, three compressor cylinders 11 on each side.

The crank mechanism is placed in the foundation frame 1.

The crank and connecting rod mechanism consists of a crankshaft 2, made with the possibility of connection to the engine, and connecting rods 5. The crankshaft 2 is installed in main bearings 3, one of which is a thrust bearing 4.

The upper heads 6 of the connecting rods 5 are installed in the crossheads 8 located in the guides 9, and the crank heads 7 are connected to the connecting rod necks of the crankshaft 10. Because the compressor cylinders 11, which are fixed on the foundation frame 1 through the guides 9 of the crossheads 8, and are connected with a crank mechanism using rods 12 of pistons 13 connected to crossheads 8.

In the upper part of the foundation frame 1, spacers 16 with adjusting spacers 17 at the ends are installed between the longitudinal walls, with the help of which they are connected to the foundation frame 1 without gaps.

The crankshaft 2 is made with 18 oval-shaped cheeks.

Thrust bearing 4 contains a cover 19, in which thrust half-rings 20 are installed.

Guides 9 of crossheads 8 are made with longitudinal stiffening ribs 21.

Rods 12 of pistons 13 of compressor cylinders 11 are connected to crossheads 8 by means of nuts 22 and locknuts 23, made with annular grooves in the body, which are trapezoidal grooves with rounded corners and protrusions.

Foundation frame 1 is made of cast iron, box-section, contains transverse partitions and stiffeners. The crosshead guides 9 are attached to the side surfaces of the foundation frame 1 through sealing gaskets. On the side of the drive motor, a detachable closure is attached to the end surface of the foundation frame 1, in which the crankshaft seal 2 is placed. A steel closure is attached to the opposite end of the foundation frame 1, on which the oil pump and the oil pump drive are located. On top of frame 1, a closure made of steel sheet is installed. It has hatches for ease of maintenance.

Crankshaft 2 is completely forged. The rotation frequency of crankshaft 2 is 1000 rpm. The crankshaft 2 is installed in seven main bearings 3, the second bearing from the drive side is thrust bearing 4. Each bearing has two interchangeable inserts - a frame insert and a cover insert 3. The bearings are made of bimetallic tape.

The cover 19 of the thrust bearing 4 is cast from high-strength cast iron. 2 thrust half-rings 20 are installed in the cover 19 of the thrust bearing 4. The cover 19 with the half-rings 20 has an exact fit to the socket of the foundation frame 1. The thrust bearing cover 19 is attached to the foundation frame with pins. Connecting rods 5 are made of alloy steel. To reduce dynamic imbalance, a set of connecting rods 5 is selected in such a way that the difference in mass of connecting rods 5 does not exceed 0.4 kg.

From Kreutzkopf 8 are made of welded steel, without separate creepers. The working surfaces of crossheads 8 are filled with babbitt.

Crosshead guides 9 are cast from cast iron and have lights cast together with them for fastening compressor cylinders 11. Compressor cylinders 11 are made of alloy steel forgings, as well as castings of high-strength or gray cast iron. Compressor cylinders 11, depending on the gas injection temperature, are made with air or water cooling. For unloading during start-up, as well as for regulating performance during operation in order to obtain maximum loading of the gas engine compressor, compressor cylinders 11 can be equipped with regulating devices or devices for disconnecting the working cavity of the cylinder. Rods 12 are made of high-quality steel. To increase the wear resistance, the working surface of the rod is hardened by TVC to a hardness of 52...62 NKS. The maximum allowable force on the rod is 32 tons.

Pistons 13 are made of cast iron, and depending on the diameter, they can have an internal cavity with longitudinal ribs. Depending on the pressure drop, a different number of piston rings are installed on the pistons 13, which are made of composite materials that work with minimal oil supply or without lubrication. To increase the service life, pistons 13 are equipped with replaceable support rings.

The landing of the piston 13 on the rod 12 is carried out on a cylindrical surface with fixation in the axial direction by the stop edge of the rod 12 and fastening of the piston 13 with a rod nut, which, after final tightening and checking that the nut does not protrude from the end of the piston, is locked with a screw, with the latter turning. The rods 12 of the pistons 13 are attached to the crossheads 8 with nuts 22 and locknuts 23 and eight bolts screwed onto the rods 12. To control the tightening, each bolt has a rod installed in the bolt body with a gap. Control of the regulating devices of the compressor cylinders 11 is carried out using the control unit.

To rotate the crankshaft 2 during maintenance, a shaft turning device is used.

The foundation frame 1 as a whole with all the movement mechanism, nodes and pipelines is installed on a subframe with supports under the crosshead guides 9, with the help of which the compressor is mounted on the foundation. The drive of the piston compressor is carried out by a drive motor, in the role of which 60 can be used: a gas piston engine, an electric motor, a gas turbine.

The proposed useful model works as follows.

Before start-up, the piston compressor is pre-pumped with oil from the electric pump unit.

After that, the drive motor is started, which transmits rotation to the crankshaft 2, which rotates in the main bearings 3, 4. The rotation from the crankshaft 2 through the connecting rods 5 is transmitted to the crossheads 8, which move in the guides of the crossheads 9, and further through the rods 12 of the compressor cylinders 11 reciprocating motion is transmitted to pistons 13.

The compressed gas enters the working cavity of the compressor cylinders 11 through the suction buffer tanks 14 and the suction valves. The pistons 13, moving in the compressor cylinders 11, compress the gas that has entered the compressor cylinders 11. The compressed gas passes through the discharge valves, the discharge buffer tanks 15 enters the discharge pipeline of the compressor station.

Regulation of the performance and power of the piston compressor is carried out by regulating devices of the compressor cylinders 11, which are devices installed in place of the back cover of the compressor cylinder. The principle of operation of the regulating device is to add additional volume to the working compression cavity of the compressor cylinder, which allows to reduce the volume of suction gas, which means to reduce the performance and loading of the compressor. Control of regulating devices is carried out by the control unit.

The spacers 16, which are installed without clearance between the longitudinal walls of the foundation frame 1 with the help of adjusting spacers 17, provide an increase in the transverse rigidity of the foundation frame 1 by limiting the transverse movement of the upper part of the longitudinal walls of the foundation frame 1, which is caused by the forces from the pistons 13 15 of the compressor cylinders 11.

The oval shape of the cheeks 18 of the crankshaft 2 reduces their mass, which ensures a reduction in inertial forces and moments affecting the crankshaft 2 during rotation, without impairing its strength. The execution of guides 9 of crossheads 8 with longitudinal stiffening ribs 21 ensures an increase in longitudinal and transverse stiffness due to an increase in the cross-sectional area of the guides 9.

Z The execution of nuts 22 and locknuts 23 with a special annular groove in the body, which are trapezoidal grooves with rounded corners and protrusions, ensures uniform distribution of forces from the rods 12 along the entire height of the thread of nuts 22 and locknuts 23 due to their greater flexibility during tightening.

The offered piston compressor is characterized by an increased allowable force on the rod - 32 t, which allows the compressor to work in a wider range of gas pressures on suction and discharge, and also contributes to a more complete use of the power of the compressor to obtain greater productivity. Suction pressure can be in the range from 0.5 MPa to 10 MPa, discharge pressure from 5.0 MPa to 500 MPa, productivity from 25000 nm3/h. up to 300,000 nm3/h. with a nominal compressor capacity of 4.0 MW. At the same time, the device has a small weight and dimensions, which allows you to transport it with reinforced mounting blocks.

The operating parameters of the offered piston compressor, modification 6YEPKZ32-1/(47-57)- (77-103) as part of the gas pumping unit 10 HPA-4RMP with a gas turbine drive are confirmed by the act of acceptance tests of the main sample of the gas pumping unit

HPA-ARMP.

Currently, the applicant has developed the following modifications of the piston compressor with a rod force of 32 tons for pumping natural gas into underground gas storages: piston compressor 6ЕПКЗ32-1/(36-51)-(71-116) with absolute suction pressures from 3.6 MPa up to 5.1 MPa and on discharge from 7.1 MPa to 11.6 MPa, with productivity from 81800 nm3/h.

BO up to 173400 nm3/h.; piston compressor 6PKZ32-2/(20-31)-(90-161) with absolute suction pressures from 2.0 MPa to 3.1 MPa and discharge pressures from 9.0 MPa to 16.3 20 MPa, productivity from 38300 nm3/hour up to 70800 nm3/hour; piston compressor 6PK32-2/(34-72.6)-(80-145) with absolute pressures on suction from 3.4 MPa to 7.26 MPa and on discharge from 8.0 MPa to 14.5 MPa, productivity from 57700 nm3/h. up to 212800 nm3/h.

Claims (9)

USEFUL MODEL FORMULA 1. A reciprocating compressor containing a foundation frame in which a crank-rod mechanism is placed, consisting of a crankshaft, made with the possibility of connection with the engine, installed in main bearings, one of which is thrust, and connecting rods, the upper heads of which installed in the crossheads located in the guides, and the crank heads are connected to the connecting rod necks of the crankshaft, the compressor cylinders, fixed to the foundation frame through the guides of the crossheads, and connected to the crank mechanism by means of piston rods connected to crossheads, suction and discharge buffer tanks, which is distinguished by the fact that in the upper part of the foundation frame between the longitudinal walls spacers are installed with adjusting spacers at the ends, with the help of which they are connected without gaps to the foundation frame, the crankshaft is made with oval-shaped cheeks, the thrust bearing contains a cover in which the thrust half-rings are installed, the guides of the crossheads are made from the sides with rigid ribs, the piston rods of the compressor cylinders are connected to the crossheads by means of nuts and locknuts made with annular grooves in the body. 2. The piston compressor according to claim 1, which is characterized by the fact that the foundation frame is cast from cast iron СЧ25, reinforced in the transverse direction with ribs with a transition to the support platforms. 3. Piston compressor according to claim 1, which is characterized by the fact that the crankshaft is installed in seven main bearings, while the bearing, which is made second from the engine side, is a thrust bearing. 4. A piston compressor according to claim 1, which is characterized by the fact that the spacers are made of rolled steel with a round section and are fixed on the frame with the help of tightening bolts. 5. The piston compressor according to claim 1, which differs in that the adjusting spacers are made in the form of washers of the same material as the spacers, the thickness of which corresponds to the gap between the spacer and the longitudinal wall of the foundation frame. 6. Piston compressor according to claim 1, which is characterized by the fact that two half rings are installed in the thrust bearing cover, while the thrust bearing cover is connected to the foundation frame with pins. 7. Piston compressor according to claim 1, which is characterized by the fact that the special annular groove in the body of the nuts and locknuts is a trapezoidal groove with rounded corners and protrusions. 8. The reciprocating compressor according to claim 1, which is characterized by the fact that it contains six compressor cylinders, oppositely located relative to the foundation frame, three compressor cylinders on each side. 9. 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