RU2693498C2 - Mounting sleeve for air treatment plant turbine impeller and air treatment plant comprising such fastener - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to a fastening bushing for turbine wheel of an air treatment plant and to an air treatment plant comprising such fastener. Air treatment plant comprises a motor configured to rotate the shaft about an axis, an attachment element of the turbine wheel on the shaft, wherein through the fastening element passes a channel configured to interact with the drive shaft, wherein in channel and on shaft is made a flat chamfer for locking rotation of fastener relative to shaft, wherein fastening element comprises fastening element rotation ribs relative to turbine impeller, wherein the ribs are configured to interact with the turbine wheel slits, fastening element contains screw shaft made with possibility of interaction with pressure screw for blocking of translational movement of fastener relative to drive shaft.

EFFECT: this allows improving attachment reliability.

10 cl, 6 dwg

Description

The invention relates to a mounting sleeve for the turbine impeller of an air treatment unit and to an air treatment unit containing such a fastener.

In particular, the invention relates to the field of climatic installations, which are air treatment devices, comprising a filter, an electric fan assembly and a heat exchanger. These elements are assembled and enclosed in the case, if necessary, closure facing casing.

As a rule, these air conditioning systems are installed on the window sill or are fully or partially embedded in a suspended ceiling or in the attic floor.

Climatic installations are mainly used to filter the air and thus ensure its quality, as well as to maintain a temperate climate in the room or in the volume in question due to heat exchange between the treated air and the fluid, most often water or a mixture of water with ethylene glycol. The fluid may be hot, in which case it is used to heat the room, or cold to cool it.

The air serves as the primary fluid and provides comfort, quality and temperature. It is guided in an air-conditioning unit by an electric fan unit, which typically contains an engine and a sub-frame, one or more turbines, such as a centrifugal turbine, and metal components such as a platform, one or more spiral nozzles, and helical nozzle covers.

The air is drawn in at the inlet through the side vents of the fan and spreads at the outlet when the necessary conditions for speed and temperature.

The turbine impeller is mounted on one or two drive shafts, and a fastener is used to connect the impeller to the drive shafts.

This fastener, sometimes referred to as a hub, tire or sleeve, is primarily designed to stop the wheel from rotating and moving relative to the drive shaft so that the wheel retains its original position throughout the entire life of the air conditioner.

For mounting the turbine impeller on the drive shaft, as is known, a tight fit is used, which is a tight fit between the drive shaft and the fastening sleeve, while the outer diameter of the drive shaft slightly exceeds the inner diameter of the fastening sleeve.

Alternatively, a metal or plastic band can be used to tighten the mounting sleeve on the drive shaft.

Finally, mounting is also known by means of a sliding joint between the mounting sleeve and the drive shaft, and these elements have a flat chamfer to block their relative rotation. A pressure screw screwed into the mounting sleeve ensures that their relative translational motion is blocked.

In these three types of fasteners, classically used for fastening a metal impeller of a turbine with a metal fastening sleeve, wear resistance problems arise when it is necessary to fasten a turbine impeller made of a composite material on a metal shaft. Given the softness of the composite, the compound tends to break after several hundred hours of operation.

In addition, mounting sleeves often cause an imbalance that interferes with the dynamic operation of the air conditioner and speeds up the mounting failure.

The document DE 19708767 discloses a hub for mounting a screw on an engine, wherein the hub comprises an outer cylindrical body and an inner cylindrical body, between which an elastic layer is located. In the embodiment shown in FIG. 5A and 5B, outer ribs are made on the outer side of the inner cylindrical body, and inner ribs are made on the inner side of the outer cylindrical body. Given their respective diameters, these ribs do not engage with each other. In addition, the elasticity of the intermediate layer prevents the blocking of rotation of the inner and outer cylindrical bodies relative to each other. Finally, in this case there is no provision for blocking the translational movement of these cylindrical bodies relative to each other, which is fraught with the risk of accidental disengagement.

The objective of the invention is to eliminate the above disadvantages by creating a fastener for the impeller of the turbine air treatment, while the installation of air treatment contains:

- the engine, resulting in rotation of the shaft around the axis,

- turbine impeller fastening element on the shaft.

A channel passes through the fastening element, which is adapted to interact with the drive shaft, while a flat chamfer is made in the channel and on the shaft to block the rotation of the fastening element relative to the shaft. The fastening element contains the ribs blocking the rotation of the fastening element relative to the turbine impeller, the ribs being adapted to interact with the slots of the turbine impeller. The fastening element contains a screw shaft, made with the possibility of interaction with the pressure screw to block the translational movement of the fastening element relative to the drive shaft.

Thanks to the invention, the flat chamfer of the fastener blocks the rotation relative to the drive shaft. The ribs allow you to block the rotation of the fastener relative to the impeller of the turbine. When the pressure screw is screwed into the screw barrel, it provides blocking of the translational movement of the fastening element relative to the drive shaft.

The fastening element can be made of lightweight material, in particular, from a plastic material. The fastener has no imbalance and does not create vibrations due to inertia. The strength of the connection, made with the help of a fastener, has increased compared with the known fasteners.

According to preferred, but non-limiting embodiments of the invention, such a fastener may have one or more of the following features, considered separately or in any technically acceptable combination:

- the element contains at least one protrusion for balancing the inertia of the fastening element.

- one of the protrusions is diametrically opposite to the screw shaft.

- the protrusions are evenly distributed in the angular direction around the axis.

- the element contains the ribs of the mechanical amplification of the screw barrel.

- the outer wall of the fastener contains at least one spike marking the angular position of the fastener.

- the fastening element is made of plastic material, preferably of a material containing a thermoplastic polymer, in particular polybutylene terephthalate.

- the plastic material further comprises fibers, in particular glass fibers.

- the fastening element contains an internal shoulder, made with the possibility of focusing on the impeller of the turbine.

The object of the invention is also the installation of air treatment, which contains:

- the engine, resulting in rotation of the shaft around the axis,

- turbine impeller fastening element on the shaft in accordance with the invention.

The invention and its other advantages will be more apparent from the following description, presented solely as an example with reference to the accompanying drawings.

FIG. 1 shows an air treatment unit in accordance with the invention, including a turbine impeller mounting sleeve on a drive shaft;

in fig. 2 shows the turbine wheel from the side indicated by arrow II in FIG. 1, with the sleeve and the drive shaft not shown;

in fig. 3 shows the turbine wheel shown in FIG. 2 is a longitudinal sectional view;

in fig. 4 shows the sleeve shown in FIG. 1, a perspective view;

in fig. 5 shows the sleeve on the side indicated by arrow IV in FIG. four;

in fig. 6 shows a sectional view along line VI-VI of FIG. five.

FIG. 1 shows an air treatment unit or air conditioner 1, which comprises an electric motor 2 mounted on a platform 3 and rotating an output shaft 4 on which a turbine impeller 5 is mounted, located in a casing 6 having openings for air passage.

The turbine impeller 5 has a common cylindrical shape with a round base and contains internal blades 51, made along the length of the axis of rotation X of the shaft 4, which is the axis common to the engine 2, the turbine impeller 5 and the sleeve 7 fastening the turbine impeller 5 to the shaft four.

Inside the impeller 5 of the turbine perpendicular to the X axis, a wall 52 is formed. Along the X axis, the wall 52 is located at the level of the central zone of the impeller 5 of the turbine. A sleeve coupling 53 with a center on the axis X passes through the wall 52.

Each longitudinal end of the sleeve coupling 53 contains several slots 54, for example, six slots parallel to the X-axis and extending at the level of this longitudinal end.

Both sides of the wall 52 contain several reinforcing ribs 55, for example, six ribs, each of which extends along the length in the radial direction relative to the X axis. The ribs 55 are located adjacent to the sleeve coupling 53 and are separated from each other through uniform intervals in the angular direction around the X axis Ribs 55 are aligned with slots 54 in the angular direction around the axis.

The shaft 4 comprises a flat face 41, parallel to the axis X.

The sleeve 7 blocks the rotation and translational movement of the wheel 5 relative to the shaft 4. Along the axis X, the sleeve 7 contains two parts 7A and 7B of a common cylindrical shape with a round base. Part 7A is made with the possibility of installation from the side wall 52 of the impeller 5 of the turbine.

Through the sleeve 7 passes the central longitudinal channel 71 centered on the axis X for the passage of the shaft 4. At the level of part 7A of the sleeve 7, the diameter of the channel 71 exceeds the diameter of the channel 71 in part 7B. Thus, between the parts 7A and 7B is formed an internal shoulder 72 of annular shape, perpendicular to the axis X. The shoulder 72 abuts against the end of the sleeve coupling 53 of the impeller 5 of the turbine.

Inside part 7A, the cylindrical part of sleeve 7, which borders channel 71, contains several ribs 73 parallel to the X axis and evenly distributed in the angular direction around the X axis. The number of ribs 73 is equal to the number of slots 54 of the impeller 5 of the turbine. Ribs 73 are located in the slots 54, providing a blocking of the rotation of the sleeve 7 relative to the shaft 4, like the splines.

Inside the part 7B, the cylindrical part of the sleeve 7, which limits the channel 71, contains a flat face 74, parallel to the axis X, which interacts with the flat face 41 of the shaft 4, providing a blocking rotation of the sleeve 7 relative to the shaft 4.

The outer wall of the part 7B of the sleeve 7 contains several spikes 75 marking the angular position of the sleeve 7, for example, three spikes evenly spaced in the angular direction around the X axis. The spikes 75 form a visual mark for mounting the sleeve 7 blindly.

Part 7A of the sleeve 7 comprises a radially screwed barrel 76. The screw barrel 76 contains a threaded hole for screwing the pressure screw passing through one of the slots 54. The pressure screw in the figures is not shown and tightens the sleeve 7 on the flat face 41 of the shaft 4 to block the translational the movement of the sleeve 7 relative to the shaft 4 along the axis X.

Thus, the sleeve 7 blocks the translational movement of the impeller 5 of the turbine along the axis X relative to the shaft 4.

Screw barrel 76 contains reinforcing ribs 76.1, 76.2, 76.3 and 76.4. The ribs 76.1 and 76.2 are perpendicular to the X axis, while the ribs 76.3 and 76.4 are perpendicular to the ribs 76.1 and 76.2 in the plane that passes through the X axis and through the axis of the screw barrel 76.

Ribs 76.1-76.4 allows to increase the mechanical strength of the screw barrel 76 and sleeve 7 while tightening the pressure screw.

Starting from the outer wall of the part 7A of the sleeve 7, the protrusion 77 is diametrically opposed to the screw shaft 76. The protrusion 77 comprises a wall 77.1 coplanar with the ribs 76.3 and 76.4 and a wall 77.2 perpendicular to the axis X. The protrusion 77 also provides mechanical reinforcement of the sleeve 7.

On the outer wall of the part 7A of the sleeve 7, projections or thickenings 78 are made parallel to the X axis. The protrusions 77 and 78 are evenly distributed in the angular direction around the X axis.

The protrusions 78 and the protrusion 77 provide a balance in the inertia of the sleeve 7 to avoid imbalance, adversely affecting the service life of the sleeve 7.

The sleeve 7 is made of plastic material containing a thermoplastic polymer, such as polyester. If necessary, the thermoplastic polymer may additionally contain fibers, such as heat-resistant reinforced fibers, in particular glass fibers. An example of a polyester is polybutylene terephthalate, such as PBT GF 30 (registered trademark), reinforced with glass fibers. This material is relatively lightweight, which is an advantage.

The sleeve 7 is made with the possibility of mounting the impeller 5 of the turbine, made of plastic or composite material. It can be used for different types of climatic installations, which reduces the cost of manufacture. The sleeve 7 allows to obtain satisfactory aerodynamic, acoustic and mechanical characteristics, while at the same time balancing the masses in order to reduce the vibrations of the rotating elements.

The strength of the connection with respect to rotation and translational movement after tightening the pressure screw, as well as moisture resistance and resistance to temperature differences is much better than in the known solutions.

Claims (17)

1. The fastening element (7) for the impeller (5) of the turbine of the installation (1) air treatment, while the installation (1) air treatment contains: - engine (2), made with the possibility of bringing into rotation of the shaft (4) around the axis (X), - an element (7) for fastening the impeller (5) of the turbine on the shaft (4), at the same time through the fastening element (7) passes the channel (71), made with the possibility of interaction with the drive shaft (4), while in the channel (71) and on the shaft (4) there is a flat chamfer (74, 41) to block the rotation of the fastening element (7) relative to the shaft (4), characterized in that - the fastener (7) contains the ribs (73) of blocking the rotation of the fastener (7) relative to the impeller (5) of the turbine, while the ribs (73) are designed to interact with the slots (54) of the impeller (5) of the turbine, - the fastening element (7) contains a screw barrel (76), made with the possibility of interaction with the pressure screw to block the translational movement of the fastening element (7) relative to the drive shaft (4). 2. The fastening element (7) according to claim 1, characterized in that it contains at least one protrusion (77, 78) for balancing the inertia of the fastening element (7). 3. The fastening element (7) according to claim 2, characterized in that one of the protrusions (77) is diametrically opposed to the screw shaft (76). 4. The fastener (7) in one of the paragraphs. 2 or 3, characterized in that the protrusions (77, 78) are evenly distributed in the angular direction around the axis (X). 5. The fastener (7) in one of the paragraphs. 1-3, characterized in that it contains the ribs (76.1-76.4) of the mechanical reinforcement of the screw stem (76). 6. The fastener (7) in one of the paragraphs. 1-3, characterized in that its outer wall contains at least one spike (75) marking the angular position of the fastening element (7). 7. The fastener (7) in one of the paragraphs. 1-3, characterized in that it is made of plastic material, preferably of a material containing a thermoplastic polymer, in particular, polybutylene terephthalate. 8. The fastener element (7) according to claim 7, characterized in that the plastic material further comprises fibers, in particular, glass fibers. 9. The fastener (7) in one of the paragraphs. 1-3, characterized in that it contains an internal shoulder (72), made with the possibility of focusing on the impeller (5) of the turbine. 10. Installation (1) air treatment, characterized in that it contains: - engine (2), made with the possibility of bringing into rotation of the shaft (4) around the axis (X), - element (7) for fastening the impeller (5) of the turbine on the shaft (4) in one of the paragraphs. 1-9.

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