RU204980U1 - CENTRIFUGAL SEALED PRESSURE PLANT - Google Patents

Abstract

The utility model relates to the field of compressor engineering. A sealed centrifugal pumping unit driven by an electric motor with a variable speed contains a housing, a front cover with a suction pipe, a bearing block with bearings, a housing with a flow path located in it, including a rotor shaft with an impeller, a working chamber, and a diffuser channel and a spiral gas collector that merges into an outlet diffuser. The transmission of torque to the rotor is transmitted through a magnetic coupling. The combined electric motor, which is installed with paws on the plate, is connected through the flange of its front cover through the lantern with the bearing block, which ensures the required alignment of the magnetic coupling halves relative to each other and guarantees it during operation. The front cover of the injection unit can have an additional flange, which increases its rigidity and ensures a tight connection with the casing at high inlet pressure. The connection of the inlet and outlet diffuser with the main pipelines is carried out through flexible metal hoses, which facilitates installation work, reduces vibrations transmitted to the pipelines. The plate on which the engine is installed is connected to the frame using adjustable supports and screw stops for precise mating of the lantern flanges of the main unit and the front cover of the engine, and also has a device for moving the electric motor along the axis, which facilitates installation work.

Description

Technology area

The utility model relates to the field of compressor engineering.

State of the art

Known centrifugal blower (patent RU 2640894 C1) containing a housing made in the form of a cylinder, the ends of which are closed by the front and rear sealing covers fixed from movement, between which a replaceable flow path is installed. The front cover is made with an axial suction pipe, and the rear cover is installed between the impeller and the bearing block of the blower, made in the form of support and support-thrust bearings, and is connected to them. The flow path includes an impeller cantilevered on the rotor shaft, at the other end of which a drive coupling is installed, as well as a radial diffuser channel and an outlet cavity formed by the inner surface of the front cover, a removable volute and a removable annular spacer. The covers are secured to the body through retaining rings, which are heavy at high inlet pressures. The change of the flow path of the aerodynamic stage is organized towards the drive half of the coupling.

The disadvantage of the centrifugal blower is the high labor intensity of assembly and disassembly work, since, in the event of repair of the flow path, it is necessary to dismantle the rear cover together with the bearing block and the impeller, having previously removed the drive and the retaining ring. The regulation of the performance and pressure of the supercharger is carried out by installing the flow path with other geometric parameters, the change of which is limited by the dimensions of the housing, and this reduces the adjustment range. All this complicates the work carried out, for example, in the field.

The closest analogue is a centrifugal injection unit, the source is a technical and commercial proposal No. 14PIN026 dated 03/31/2014, FIMA-MaCouCo type RC1-71 with a direct drive and a magnetic coupling from FIMA Maschinenbau GmbH, which has an axial inlet and tangential gas outlet, containing : cylindrical body welded to the front end cover with axial suction port; the flow path, located in the housing and including the impeller, cantilevered on the rotor shaft, with a magnetic coupling half mounted on the other end of the shaft. As a drive, a frequency-controlled electric motor with a leading magnetic half-coupling installed on its shaft is used, which provides a wide range of regulation of the rotor speed and the blower performance.

The disadvantages of the injection unit are that the working cavity is formed by three parts, the connection of the inlet pipe and the outlet diffuser with the main pipeline is provided through bellows expansion joints, which requires an exact relative position of the injection unit and the main pipelines, as well as high labor intensity of repair work, since removal the bearing block cannot be carried out without removing the rear cover together with the impeller, and before that, it is necessary to remove the electric motor by moving it, first, along the axis and without damaging the sealing screen of the magnetic coupling. The pumping unit does not have design elements that ensure accurate relative movement and installation during dismantling and installation of the electric motor within the permissible alignment of the rotor and motor shafts, which makes the process of ensuring the alignment of the magnetic coupling halves and its control during operation laborious. Misalignment can lead to mechanical destruction of the sealing screen, due to the small gaps between its wall and the cylindrical surface of the driving half of the coupling. Dismantling the electric motor requires the use of lifting devices, which increases the risk of damage to the sealing screen during its longitudinal movement to remove the driving half of the coupling from the interaction zone with the driven half of the coupling. The impossibility of controlling the angular misalignment of the shafts requires the design of the frame without adjustable supports to designate high accuracy of positioning and shape tolerances when machining the reference surfaces.

Disclosure of a utility model

The technical problem to be achieved by the utility model is the possibility of repairing the flow path of a centrifugal hermetic injection unit without the need to dismantle the main pipeline to provide access to the flow path; the possibility of repairing the carrier unit without the need to dismantle the body, as well as, the ease of installing the electric motor within the permissible limits of alignment relative to the rotor axis with minimal use of lifting mechanisms.

The technical result is achieved by the fact that on a centrifugal sealed injection unit containing a housing, a front cover made with an axial suction nozzle, a rotor shaft installed in the radial and angular contact bearings of the bearing block connected to the housing, and a flow path located therein, including in itself an impeller, cantilevered on the rotor shaft, with a magnetic coupling half installed at the other end of the shaft, a working chamber, as well as a radial diffuser channel, a spiral gas collector passing into an outlet diffuser formed by the inner surfaces of the housing and front cover, driven by an electric motor with a variable speed of rotation, on the shaft of which a leading magnetic coupling half is installed, which transfers torque to the rotor half-coupling through a sealing screen, a combined electric motor is used, which is installed with its paws on the plate and is connected by means of its front cover flange through a lantern to the carrier m block, ensuring the required alignment of the magnetic coupling halves relative to each other.

An additional flange is installed on the front cover of the centrifugal hermetic pumping unit, which increases its rigidity and does not require its weighting and ensures the tightness of the connection with the casing at high inlet pressure; the connection of the inlet pipe and outlet diffuser with the main pipelines is carried out through flexible metal hoses, which allows dismantling the front cover without dismantling the main pipelines, when the centrifugal hermetic pumping unit is operating, they damp vibrations and minimize their transfer to the pipelines. The centrifugal sealed pumping unit does not have a rear cover and the carrier unit is dismantled after removing the front cover and the impeller, which excludes the possibility of their damage, as in the case of joint removal of the rear cover, wheel and carrier unit in the above-described structures.

The plate on which the engine is installed is connected to the frame using adjustable supports, has a device - a bar with a lead screw for moving the electric motor along the axis, as well as screw stops for precise alignment of the shafts in the transverse direction. This makes it possible, without the use of lifting mechanisms, to bring the electric motor with a leading magnetic coupling along the axis from the working position to a position that opens access to the sealing screen and makes it possible to dismantle the bearing block, from the same position a preliminary alignment of the electric motor and rotor shafts is carried out. With the help of a strap with a lead screw, the engine moves to the operating position and is joined by its flange through the lantern with the bearing block, if necessary, its final position is adjusted by adjustable supports and cross stops, providing the gaps between the seating surfaces of the flanges within the permissible alignment. The presence of adjustable supports does not require high precision machining of the frame in terms of location and shape tolerances of the reference surfaces.

Brief Description of Drawings

Figure 1 shows a longitudinal section of a sealed centrifugal injection unit.

Figure 2 shows a top view of a plate with stops and a mechanism for the longitudinal movement of the electric motor.

Implementation of the utility model

The pumping unit is centrifugal sealed, containing: housing 1 (Fig. 1), mounted on frame 2, front cover 3, made with axial suction nozzle 4, rotor shaft 5, installed in radial 6 and angular contact 7 bearings of bearing block 8, connected with a housing, and a flow path placed in it, including an impeller 9, located cantilever on the rotor shaft, a driven magnetic coupling half mounted on the other end of the shaft, a drive from an electric motor 11 with a variable speed, on the shaft of which a driving magnetic coupling half is installed 12, which transfers torque to the rotor coupling half through the sealing screen 13.

The casing of the centrifugally sealed injection unit contains a working chamber, as well as a radial diffuser channel or a blade diffuser, a spiral gas collector that passes into the outlet diffuser 14, formed by the inner surfaces of the casing and the front cover.

At a high inlet pressure, an additional flange 15 is installed on the front cover, which ensures the tightness of the connection of the front cover with the body, increases its rigidity at the attachment point and facilitates assembly and disassembly of the installation due to the fact that the thickness of the cover and its weight can be significantly reduced. In addition, the flange is made from a cheaper material.

The electric motor of the combined version 11 is installed with its feet on the plate 16, which, in turn, is connected to the frame 2 through the adjustable supports 17. In this case, the motor flange is connected through the lantern 18 to the bearing block, providing the required alignment of the magnetic coupling halves relative to each other. The connection of the inlet pipe and outlet diffuser with the main pipelines is carried out through flexible metal hoses 19, which ensure ease of assembly and disassembly of the installation without dismantling the pipelines.

The plate 16 (Fig. 2), on which the engine is mounted, has a bar 20 with a lead screw for moving the electric motor along the axis, in order to ensure trouble-free dismantling and installation of the magnetic coupling without using lifting mechanisms, as well as screw stops 21 for precise alignment shafts in the transverse direction through the strips 22.

Claims (4)

1. A centrifugal sealed injection unit containing a housing, a front cover made with an axial suction nozzle, a rotor shaft installed in the radial and angular contact bearings of the bearing block connected to the housing, and a flow path located therein, including an impeller, cantilevered on the rotor shaft, with a magnetic half-coupling installed at the other end of the shaft, a working chamber, as well as a radial diffuser channel, a spiral gas collector passing into an outlet diffuser formed by the inner surfaces of the housing and front cover, driven by an electric motor with a variable speed of rotation, on the shaft of which is equipped with a driving magnetic half-coupling, which transfers torque to the rotor half-coupling through a sealing screen, characterized in that a combined electric motor is used, which is installed with its paws on the plate and is connected by means of its front cover flange through a lantern with a bearing block, providing the required alignment of the magnetic coupling halves relative to each other. 2. A centrifugal hermetic injection unit according to claim 1, characterized in that an additional flange is installed on the front cover of the injection unit, which increases its rigidity and ensures tightness of the connection with the casing at high inlet pressure. 3. A centrifugal hermetic injection unit according to claim 1 or 2, characterized in that the connection of the inlet branch pipe and the outlet diffuser with the main pipelines is carried out through flexible metal hoses. 4. A centrifugal hermetic pumping unit according to claim 1 or 2, characterized in that the plate on which the engine is installed is connected to the frame using adjustable supports, has a device - a bar with a lead screw for moving the electric motor along the axis, as well as screw stops for precise alignment of the shafts in the transverse direction.

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