EP2917576A1

EP2917576A1 - A hermetic compressor with reduced vibration

Info

Publication number: EP2917576A1
Application number: EP13770437.5A
Authority: EP
Inventors: Nazim Arda EYYUBOGLU; Cihan Gunduz; Tolga Yaroglu; Sarper Marasli; Yusuf Sahin
Original assignee: Arcelik AS
Current assignee: Arcelik AS
Priority date: 2012-10-05
Filing date: 2013-09-24
Publication date: 2015-09-16
Also published as: CN104903576A; BR112015007664A2; CN104903576B; WO2014053361A1; KR20150067234A

Abstract

The present invention relates to a hermetic compressor (1) comprising a casing (2) which supports the members therein and wherein the oil lubricating the movable members is placed, a motor (3) having a rotor and a stator, a piston (4) that sucks and pumps the refrigerant by moving with the actuation received from the motor (3), and a crankshaft (5) providing the rotational motion of the rotor to be transmitted to the piston (4) in the form of linear motion.

Description

A HERMETIC COMPRESSOR WITH REDUCED VIBRATION

The present invention relates to a hermetic compressor, the vibration of which is reduced.
In the hermetic compressors used in cooling devices, there is a piston providing the refrigerant to be sucked and pumped, and a cylinder wherein the piston is placed. The piston provides the refrigerant to be compressed by moving forwards and backwards inside the cylinder. The movement of the piston is provided by a crankshaft-piston rod-crankpin mechanism. In the state of the art, in order to balance the weight of the parts moving in the hermetic compressor, a counterweight is placed opposite the side wherein the piston is connected to the crankshaft. However, the counterweight increases the quantity of the total rotating mass. Therefore, the volume of the compressor is increased.
In the European Patent Document No. EP2191134, a compressor is described that has a cut-out which is located on the crankshaft and which divides the surface of the crankshaft into two.
The aim of the present invention is the realization of a hermetic compressor wherein the vibration occurring during the operation is provided to be reduced.
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 casing which supports the members therein and wherein the oil lubricating the movable members is placed, a motor having a rotor and a stator, a piston that sucks and pumps the refrigerant by moving with the actuation received from the motor, a crankshaft providing the rotational motion of the rotor to be transmitted to the piston in the form of linear motion, and at least one journal providing the crankshaft to be connected to the piston.
The hermetic compressor of the present invention comprises at least one recess located on the part of the crankshaft at the journal side. By means of the recess, the total weight of the crankshaft at the journal side with respect to the rotational axis of the crankshaft is reduced. Thus, the movable members are provided to be balanced and generation of vibration and/or sound during the operation of the motor is prevented.
In an embodiment of the present invention, the hermetic compressor comprises at least one counterweight placed on the crankshaft and a recess located in the opposite direction of the counterweight. Expansion of the recess volume enables the counterweight volume to be reduced. Thus, the volume of the compressor is reduced and the space occupied thereby is reduced.
In an embodiment of the present invention, the hermetic compressor comprises an upper bearing member placed on top of the lateral surface of the crankshaft, a lower bearing member placed under the lateral surface of the crankshaft and at least one recess located between the lower bearing member and the upper bearing member.
In an embodiment of the present invention, the crankshaft comprises at least one oil transportation path extending between the lower bearing member and the upper bearing member. The recess and the oil transportation path do not intersect.
In an embodiment of the present invention, the recess is situated almost parallel to the vertical direction of the crankshaft. The space occupied by the counterweight in the horizontal plane is limited by the counterweight located in the opposite direction. In the vertical plane, this limit is determined by means of the upper bearing member and the lower bearing member.
In an embodiment of the present invention, the recess is circular. By means of the recesses having one or more than one form with variable depths, the center of gravity is shifted in the direction of the counterweight.
In an embodiment of the present invention, the recess allows loads with variable weights to be mounted thereon.
By means of the present invention, a hermetic compressor having a recess that enables the center of gravity to near to the center of rotation is realized.
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.
Figure 2 – is the perspective view of the crankshaft related to an embodiment of the present invention.
Figure 3 – is the view of detail A in Figure 2.
Figure 4 – is the perspective view of the crankshaft related to another embodiment of the present invention.
Figure 5 – is the view of detail B in Figure 4.
Figure 6 – is the perspective view of the crankshaft related to another embodiment of the present invention.
Figure 7 – is the view of detail C in Figure 6.
Figure 8 – is the perspective view of the crankshaft related to another embodiment of the present invention.
Figure 9 – is the view of detail D in Figure 8.
The elements illustrated in the figures are numbered as follows:

Compressor
Casing
Motor
Piston
Crankshaft
Counterweight
Upper bearing member
Lower bearing member
Recess
Oil transportation path
Journal

The compressor (1) comprises a casing (2) which supports the members therein and wherein the oil lubricating the movable members is placed, a motor (3) having a rotor and a stator, a piston (4) that sucks and pumps the refrigerant by moving with the actuation received from the motor (3), a crankshaft (5) providing the rotational motion of the rotor to be transmitted to the piston (4) in the form of linear motion, and at least one journal (11) connecting the crankshaft (5) to the piston (4) (Figure 1).
The hermetic compressor (1) of the present invention comprises at least one recess (9) which is located on the crankshaft (5) and remains at the same side with the journal (11) with respect to the rotational axis of the crankshaft (5). The entire recess (9) is at the same side with the journal (11) in the vertical plane. The recess (9) is formed on the crankshaft (5) with methods such as milling, drilling, etc. The recess (9) is in the form of a cut-out formed on the crankshaft (5). By means of the reduced volume of the crankshaft (5), the weight of the crankshaft (5) in the direction of the journal (11) is also reduced. Thus, the weights of the members such as the crankshaft (5), piston rod, crankpin moving during the movement of the piston (4) are provided to be balanced and generation of vibration and sound is prevented.
In an embodiment of the present invention, the hermetic compressor (1) comprises at least one counterweight (6) placed on the crankshaft (5) and a recess (9) located at the opposite side of the counterweight (6) with respect to the rotational axis of the crankshaft (5). The counterweight (6) is located at one side of the vertical axis of the crankshaft (5) and the recess (9) at the other side thereof. Expansion of the recess (9) volume enables the counterweight (6) volume to be reduced (Figure 2, Figure 3, Figure 4, Figure 5).
In an embodiment of the present invention, the hermetic compressor (1) comprises an upper bearing member (7) placed on top of the lateral surface of the crankshaft (5), a lower bearing member (8) placed at the bottom of the lateral surface of the crankshaft (5) and the recess (9) located between the lower bearing member (8) and the upper bearing member (7). The oil is provided to pass through the crankshaft (5) effectively and to be transmitted to the movable members.
In a derivative of this embodiment, the crankshaft (5) comprises at least one oil transportation path (10) which is placed on the crankshaft (5), which extends from the lower bearing member (8) towards the upper bearing member (7), and which passes through the opposite side of the recess (9) with respect to the rotational axis of the crankshaft (5). The oil that is received from the gap located at the crankshaft (5) end is transmitted to the oil transportation path (10) by means of a hole. The oil passing through the oil transportation path (10) is transmitted to the movable members by means of another hole. Oil circulation is performed on the crankshaft (5), at the opposite side of the recess (9) (Figure 2, Figure 4, Figure 6).
In an embodiment of the present invention, the recess (9) extends in the same vertical direction as the crankshaft (5). The recess (9) formed by the milling method is shaped almost as a half cylinder. The recess (9) is formed in the opposite direction of the counterweight (6). Thus, the weights of the members moving during movement of the piston (4) are provided to be balanced (Figure 2, Figure 4).
In an embodiment of the present invention, the recess (9) is circular. The recess (9) is formed, for example, by drilling. The number of recesses (9) is determined according to the rotation of the hermetic compressor (1) (Figure 6, Figure 7).
In an embodiment of the present invention, the recess (9) allows loads with variable weights to be mounted thereon. Thus, in hermetic compressors (1) with different rotations, utilization of the same type of crankshaft (5) is enabled by attaching additional weights onto the recess (9) or detaching them therefrom with respect to the weights of the movable members.
By means of the present invention, a compressor (1) is realized wherein the weights of the members moving during the operation are balanced. Thus, generation of vibration and/or sound during the operation of the compressor (1) is prevented. Furthermore, the recess (9) enables the volume of the counterweight (6) to be reduced. Reducing the space occupied by the counterweight (6) also enables the volume of the compressor (1) to be reduced.
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) which supports the members therein and wherein the oil lubricating the movable members is placed,

- a motor (3) having a rotor and a stator,

- a piston (4) that sucks and pumps the refrigerant by moving with the actuation received from the motor (3),

- a crankshaft (5) providing the rotational motion of the rotor to be transmitted to the piston (4) in the form of linear motion,

- at least one journal (11) connecting the crankshaft (5) to the piston (4),

characterized by at least one recess (9)

- which is located on the crankshaft (5) and

- which remains at the same side with the journal (11) with respect to the rotational axis of the crankshaft (5)
The hermetic compressor (1) as in Claim 1, characterized by at least one counterweight (6) placed on the crankshaft (5) and by the recess (9) located at the opposite side of the counterweight (6) with respect to the rotational axis of the crankshaft (5).
The hermetic compressor (1) as in Claim 1 or 2, characterized by an upper bearing member (7) placed on top of the lateral surface of the crankshaft (5), a lower bearing member (8) placed at the bottom of the lateral surface of the crankshaft (5), and the recess (9) located between the lower bearing member (8) and the upper bearing member (7).
The hermetic compressor (1) as in Claim 3, characterized by the crankshaft (5) having an oil transportation path (10) which is situated thereon, which extends from the lower bearing member (8) towards the upper bearing member (7), and which passes through the opposite side of the recess (9) with respect to the rotational axis of the crankshaft (5).
The hermetic compressor (1) as in any one of the above claims, characterized by the recess (9) that extends in the same vertical direction as the crankshaft (5).
The hermetic compressor (1) as in any one of the Claims 1 to 4, characterized by the circular recess (9).
The hermetic compressor (1) as in any one of the above claims, characterized by the recess (9) that allows loads with variable weights to be mounted thereon.