EP2798217A1

EP2798217A1 - A hermetic compressor comprising an oil sucking member

Info

Publication number: EP2798217A1
Application number: EP12787699.3A
Authority: EP
Inventors: Yusuf Koc; Ersin Donmez
Original assignee: Arcelik AS
Current assignee: Arcelik AS
Priority date: 2011-12-28
Filing date: 2012-11-13
Publication date: 2014-11-05
Also published as: CN104053908A; CN104053908B; WO2013097971A1

Abstract

The present invention relates to a hermetic compressor (1) wherein the oil sucking member (6) is prevented from being deformed inside the crankshaft (5) and wherein the lubrication efficiency thereof is improved.

Description

A HERMETIC COMPRESSOR COMPRISING AN OIL SUCKING MEMBER

The present invention relates to a hermetic compressor comprising an oil sucking member improving the lubrication conditions of the movable members thereof.
In the reciprocating hermetic compressors used in refrigerators, the sliding bearings wherein the crankshaft operates and the other movable members are lubricated with the oil disposed in the compressor casing. In compressors, lubrication provides friction losses of the movable members to be decreased, abrasion to be prevented and heat to be removed by decreasing the temperature of the compressor members. In the compressor lubrication system, the oil at the base of the casing is sucked to be delivered to the bearings and compressor members that are to be lubricated. Generally, the centrifugal force that acts on the oil as a result of the rotation of the crankshaft is utilized for delivering the oil at the base of the casing to the bearings. In variable capacity compressors used in refrigerators, the refrigeration capacity that changes depending on the operating conditions is provided by changing the compressor rotational speed. Since the compressor motor operates at low speed in cases where low capacity is to be met, abrasion may occur in bearings operating in hydrodynamic lubrication conditions. In order to deliver the oil required in cases where the compressor motor operates at low speed, a cylindrical oil sucking member having helical oil transportation grooves is concentrically disposed at the lower end of the crankshaft immersed into oil in the rotation axis of the crankshaft. The oil sucking member disposed so as to extend inside the crankshaft increases the lubrication efficiency of the compressor. During the mounting of the oil sucking member with no movement flexibility in the horizontal direction to the compressor, placing the oil sucking member so as to contact the inner surface of the crankshaft causes it to impact and damage the crankshaft. Moreover, the oil sucking member, of which the movement in the vertical direction during the delivery of the oil to the movable members is not limited, adversely affects the lubrication efficiency of the compressor.
In the state of the art International Document No. WO03012297, an elastic member is described that is used in hermetic compressors and located at the base of the oil supply device.
The aim of the present invention is the realization of a hermetic compressor comprising an oil sucking member providing the lubrication of the movable members and the oil transportation performance of which is improved.
The hermetic compressor realized in order to attain the aim of the present invention, explicated in the first claim and the respective claims thereof comprises a bracket that limits the movement of the oil sucking member during the operation of the motor, at least one connector that is mounted onto the bracket, that extends in the oil sucking member so that a gap remains therebetween and that allows the oil sucking member to rotate and at least one stopper that provides the portion of the connector extending into the oil sucking member to be mounted to the oil sucking member so as to limit the movement of the oil sucking member in the downward and upward directions and that limits the movement of the connector in the vertical direction.
In an embodiment of the present invention, the connector is fixed to the oil sucking member from one end by means of the stopper and to the bracket from the other end.
In an embodiment of the present invention, the connector extends along the oil sucking member.
In a derivative of this embodiment, the stopper comprises at least one chamber arranged at the ceiling of the oil sucking member and at least one extension that is formed by bending the end portion of the connector so as to bear against the ceiling of the oil sucking member.
In a derivative of this embodiment, the stopper comprises at least one barrier that prevents the oil sucking member and the connector from moving downwards.
In a derivative of this embodiment, the stopper comprises at least one cover that provides the extension to remain between itself and the barrier so as to prevent the extension from moving upwards. The extension makes radial movement between the cover and the oil sucking member.
In an embodiment of the present invention, the hermetic compressor comprises the connector having at least one protrusion providing the connector to be fastened to the bracket, and the bracket having the slot wherein the protrusion is placed.
In an embodiment of the present invention, the protrusion comprises at least one bend that prevents it from leaving the slot.
In an embodiment of the present invention, the connector is in form of a wire.
By means of the present invention, the oil sucking member is prevented from rubbing against the crankshaft during its mounting to the compressor and thus from being deformed as a result of this.
The hermetic compressor realized in order to attain the aim of the present invention is illustrated in the attached figures, where:
Figure 1 – is the schematic view of a hermetic compressor comprising an oil sucking member.
Figure 2 - is the exploded view of an oil sucking member, a bracket and a connector.
Figure 3 - is the sideways schematic view of the oil sucking member, the bracket and the connector.
Figure 4 - is the perspective view of an oil sucking member, a bracket and a connector.
Figure 5 - is the exploded view of an oil sucking member, a bracket and a connector.
Figure 6 - is the sideways schematic view of the oil sucking member, the bracket and the connector when the cover is open.
Figure 7 - is the sideways schematic view of the oil sucking member, the bracket and the connector when the cover is closed.
The elements illustrated in the figures are numbered as follows:

Hermetic compressor
Casing
Rotor
Stator
Crankshaft
Oil sucking member
Bracket
Connector
Stopper
Chamber
Extension
Cover
Protrusion
Slot
Bend
Barrier

The hermetic compressor (1) comprises a casing (2) supporting the members therein and wherein the oil lubricating the movable members is placed, a motor having a rotor (3) and a stator (4), a crankshaft (5) that is snap-fittingly mounted to the core of the rotor (3) in the direction of the rotation axis thereof and that provides the rotational motion of the rotor (3) to be transmitted to the piston, the lower end of which is immersed into the oil in the casing (2) and wherein a gap (B) opening into the body thereof in the axial direction starting from the lower end thereof is arranged, an oil sucking member (6) in cylindrical form, disposed through the lower end of the crankshaft (5) into the interior thereof and concentrically with the crankshaft (5), transferring the oil in the casing (2) to the crankshaft (5), a bracket (7) whereon the oil sucking member (6) is placed, connected to the stator (4), limiting the movement of the oil sucking member (6) during the operation of the motor, at least one connector (8) fastened onto the bracket (7), that extends in the oil sucking member (6) so that a gap remains therebetween and that allows the radial movement of the oil sucking member (6) and at least one stopper (9) that provides the portion of the connector (8) extending into the oil sucking member (6) to be fastened to the oil sucking member (6) so as to limit the movement of the oil sucking member (6) in the vertical direction and that limits the movement of the connector (8) in the downward or upward direction (Figure 1, Figure 2, Figure 3).
In household appliances, preferably in cooling devices, the circulation of the refrigerant used for refrigeration is provided by a reciprocating hermetic compressor (1). In these hermetic compressors (1), lubrication is performed for decreasing the friction losses in the movable members of the compressor (1) during operation, for preventing abrasion and removing the heat resulting from friction. The lower end of the crankshaft (5) is immersed into the oil in the casing (2) and the oil in the casing (2) is sucked into the crankshaft (5) by the effect of the centrifugal force. The oil passes through the crankshaft (5) in the upward direction and is delivered to the movable members on the motor and the sliding bearings by means of the oil sucking member (6) concentrically placed into the crankshaft (5). The distance between the connector (8) allows the oil sucking member (6) to make radial movement. The oil sucking member (6) moves together with the oil moving upwards with the centrifuge effect during the operation of the motor and is centered inside the crankshaft (5). Thus, the lubrication performance of the hermetic compressor (1) increases.
The oil applies force onto the oil sucking member (6) that it contacts during its upward movement in order that the oil sucking member (6) moves upwards. The connector (8) is provided to remain stationary during the operation of the motor by means of being fastened to the bracket (7). The movement inside the crankshaft (5) of the oil sucking member (6) fastened to the connector (8) by means of the stopper (9) is limited and thus the oil is easily delivered to the movable members (Figure 4). The stopper (9) is fastened to the inner surface of the oil sucking member (6). The upward-downward movement of the connector (8) is prevented by means of the stopper (9). With the connector (8) rotating inside the oil sucking member (6), the oil sucking member (6) is provided to be centered inside the crankshaft (5).
In an embodiment of the present invention, the connector (8) is fastened to the oil sucking member (6) from one end by means of the stopper (9) and to the bracket (7) from the other end. The connector (8) that is connected to the bracket (7) from one end during its mounting is placed into the oil sucking member (6) and is fastened to the oil sucking member (6) from the other end by means of the stopper (9). Thus, the vertical movement of the oil sucking member (6) subjected to the effect of the oil moving upwards during the operation of the motor is limited and the lubrication performance of the hermetic compressor (1) is increased (Figure 4, Figure 5).
In an embodiment of the present invention, the connector (8) extends along the oil sucking member (6). The connector (8) extends from the bracket (7) towards the ceiling of the oil sucking member (6). Thus, the connector (8) longitudinally holds the oil sucking member (6) and limits its movement inside the crankshaft (5) (Figure 6, Figure 7).
In a derivative of this embodiment, the stopper (9) comprises at least one chamber (10) arranged at the ceiling of the oil sucking member (6) and at least one extension (11) that is formed by bending the end portion of the connector (8) and that bears against the ceiling of the oil sucking member (6). During its mounting to the hermetic compressor (1), the connector (8) is fastened to the bracket (7) and passed through the oil sucking member (6). The extension (11) is created by bending the end of the connector (8). The connector (8) is prevented from getting out of the oil sucking member (6) by means of the extension (11) (Figure 5, Figure 6).
In a derivative of this embodiment, the stopper (9) comprises at least one barrier (16) that prevents the oil sucking member (6) and the connector (8) from moving downwards. When the connector (8) is placed into the oil sucking member (6), the extension (11) bears against the barrier (16). The connector (8) is prevented from sliding downwards by means of the barrier (16).
In a derivative of this embodiment, the stopper (9) comprises at least one cover (12) that prevents the connector (8) from moving upwards by being mounted onto the oil sucking member (6). The cover (12) applies pressure onto the extension (11), thereby preventing the extension (11) from moving upwards. The cover (12) and the barrier (16) are proportionally sized.
In an embodiment of the present invention, the hermetic compressor (1) comprises the connector (8) having at least one protrusion (13) providing the connector (8) to be fastened to the bracket (7), and the bracket (7) having the slot (14) wherein the protrusion (13) is seated. With the protrusion (13) being seated into the slot (14), the connector (8) is provided to be fastened to the bracket (7) (Figure 5).
In an embodiment of the present invention, the protrusion (13) comprises at least one bend (15) that prevents it from getting out of the slot (14). By means of the bend (15) that is formed by bending the end of the protrusion (13) passed through the slot (14) so as to bear against the bracket (7), the protrusion (13) is prevented from leaving the slot (14) (Figure 5).
In an embodiment of the present invention, the connector (8) is in form of a wire. The wire form provides the connector (8) with movement flexibility.
By means of the present invention, the hermetic compressor (1) is disclosed, having the connector (8) enabling the oil sucking member (6) to be mounted to the bracket (7) and the stopper (9) enabling the radial movement of the oil sucking member (6) during the operation of the motor. Thus, the oil sucking member (6) is prevented from contacting the crankshaft (5) during the operation of the motor and thus from being deformed.
It is to be understood that the present invention is not limited by the embodiments disclosed above and a person skilled in the art can easily introduce different embodiments. These should be considered within the scope of the protection postulated by the claims of the present invention.

Claims

A hermetic compressor (1) comprising a casing (2) supporting the members therein and wherein the oil lubricating the movable members is placed, a motor having a rotor (3) and a stator (4), a crankshaft (5) that is snap-fittingly mounted to the core of the rotor (3) in the direction of the rotation axis thereof and that provides the rotational motion of the rotor (3) to be transmitted to the piston, the lower end of which is immersed into the oil in the casing (2) and wherein a gap (B) opening into the body thereof in the axial direction starting from the lower end thereof is arranged, an oil sucking member (6) in cylindrical form, disposed through the lower end of the crankshaft (5) into the interior thereof and concentrically with the crankshaft (5), transferring the oil in the casing (2) to the crankshaft (5), a bracket (7) whereon the oil sucking member (6) is placed, connected to the stator (4), limiting the movement of the oil sucking member (6) during the operation of the motor, characterized by at least one connector (8) fastened onto the bracket (7), that extends in the oil sucking member (6) so that a gap remains therebetween and that allows the radial movement of the oil sucking member (6) and at least one stopper (9) that provides the portion of the connector (8) extending into the oil sucking member (6) to be fastened to the oil sucking member (6) so as to limit the movement of the oil sucking member (6) in the vertical direction and that limits the movement of the connector (8) in the downward or upward direction.
A hermetic compressor (1) as in Claim 1, characterized by the connector (8) that is fastened to the oil sucking member (6) from one end by means of the stopper (9) and to the bracket (7) from the other end.
A hermetic compressor (1) as in any one of the Claims 1 or 2, characterized by a connector (8) extending all along the oil sucking member (6).
A hermetic compressor (1) as in any one of the above claims, characterized by the stopper (9) having at least one chamber (10) arranged at the ceiling of the oil sucking member (6) and at least one extension (11) that is formed by bending the end portion of the connector (8) and that bears against the ceiling of the oil sucking member (6).
A hermetic compressor (1) as in any one of the above claims, characterized by the stopper (9) having at least one barrier (16) that prevents the oil sucking member (6) and the connector (8) from moving downwards.
A hermetic compressor (1) as in any one of the above claims, characterized by the stopper (9) having at least one cover (12) that prevents the connector (8) from moving upwards by being mounted onto the oil sucking member (6).
A hermetic compressor (1) as in any one of the above claims, characterized by the connector (8) having at least one protrusion (13) providing the connector (8) to be fastened to the bracket (7), and the bracket (7) having the slot (14) wherein the protrusion (13) is seated.
A hermetic compressor (1) as in Claim 7, characterized by the protrusion (13) having at least one bend (15) that prevents it from getting out of the slot (14).
A hermetic compressor (1) as in any one of the above claims, characterized by the connector (8) in form of a wire.