EP1831563A1

EP1831563A1 - A compressor

Info

Publication number: EP1831563A1
Application number: EP05826537A
Authority: EP
Inventors: Husnu Arcelik Anonim Sirketi KERPICCI; Kemal Arcelik Anonim Sirketi SARIOGLU
Original assignee: Arcelik AS
Current assignee: Arcelik AS
Priority date: 2004-12-27
Filing date: 2005-12-27
Publication date: 2007-09-12
Also published as: WO2006070335A1; CN100529397C; BRPI0517585A2; CN101091061A

Abstract

The present invention relates to a compressor (1) the suction performance of which is enhanced by increasing the amount of oil (B) sucked by the suction pipe (12), wherein the compressor (1) rotates together with the crank (5) and helps the movable components to transfer heat with the oil (B) sucked in.

Description

Description A COMPRESSOR

[001] The present invention relates to a compressor, the oil suction performance of which is improved.

[002] In compressors utilized preferably in refrigerators, oiling is used for reducing friction losses of the movable components of the compressor during operation, preventing wearing and discharging the heat generated due to friction. Oiling the bearings in the compressors is accomplished by the suction of the oil, which is at a certain level on the base of the casing by the oil suction pipe and transferring the oil to the bearings and compressor components that need to be oiled and/or cooled. The oil sucked in through the inlet below the oil suction pipe, which rotates together with the crankshaft, is transmitted to the upper bearings by proceeding on the inner surfaces of the oil suction pipe via the centripetal force.

[003] When the compressor operates especially at low speeds, as enough oil can not be sent to the bearings since the centripetal force decreases, such problems as heating or wearing may arise. Moreover, even at normal operating speed, there may be difficulties in oiling the bearings of the connecting rod - piston pin and the piston- cylinder when oil suction is not in desirable flow-rates.

[004] In the current state-of-the-art, in United States Patent no. US 2002/0172607, a description is given of a sucking element that is connected to springs together with the motor, wherein the sucking element also serves as a valve inside the sucking pipe.

[005] In the current state-of-the-art, in United States Patent no. US 6182794, an oil deflector that is inserted in the oil suction tube is described.

[006] The aim of the present invention is to design a compressor, the oiling performance of which is enhanced by increasing the amount of oil sucked by the suction pipe.

[007] The compressor designed to fulfill the objective of the present invention is shown in the attached figures, where:

[008] Figure 1 - is the schematic view of a compressor.

[009] Figure 2 - is the schematic view of a conical deflector having concave sides situated opposite to a transfer pipe and a suction pipe fixed to each other inside a casing that contains oil.

[010] Figure 3 - is the perspective view of a deflector having curved surfaces formed by convex and concave sides and comprising more than one channel.

[011] Figure 4 - is the perspective view of a spiral helical shaped deflector comprising more than one channel.

[012] Figure 5 - is the perspective view of a deflector of conical shape with concave sides and transfer and suction pipes connected together. [013]

[014] Figure 6 - is the perspective view of a helically shaped deflector and a suction pipe.

[015] Figure 7 - is the perspective view of a bowl shaped deflector and a suction pipe.

[016] Elements shown in the figures are numbered as follows:

1. Compressor

2. Casing

3. Cylinder

4. Piston

5. Crank

6. Connecting rod

7. Piston pin

8. Channel

9. Deflector

10. Transport pipe

11. Motor

12. Suction pipe

13. Spring

14. Hole

15. Opening

[017] In household appliances, preferably in refrigerators, the circulation of the refrigeration fluid used for cooling is provided by a compressor (1). There is a fluid in the compressor (1) providing ease of movement for the movable components and transfers the generated heat. Oil (B) is used as the fluid in the preferred embodiment.

[018] The compressor (1) comprises a motor (11), a casing (2) for holding the components within, one or more springs (13) inside the casing (2) on which the motor (11) is situated, attenuating the vibrations created while in dynamic operation, a cylinder (3) inside the casing (2) providing the pumping of the refrigerant gas within, a piston (4) providing the compressing of the refrigerant gas into the cylinder (3) hole, a crank (5) transmitting the movement received from the motor (11), a connecting rod (6) that transmits the movement received from the crank (5) to the piston (4), a piston pin (7) that connects the piston (4) to the connecting rod (6), a suction pipe (12) situated inside the crank (5), providing the suction of the oil inside the casing (2) transferring it into the crank (5), a transport pipe (10) which transfers the oil to the top section of the crank (5) and a deflector (9) fixed on the casing (2) so as to face opposite the suction pipe (12) providing the vortices to be created easily by the pressure differences during suction of oil (B) to be deflected upwards with the help of its surface shape and once formed providing their continuity.

[019] A negative pressure is created in the middle part of the suction pipe (12) and the pressure values are high along the interior walls as the oil (B) is sucked in. The pressure values outside the suction pipe (12) are lower than that of the inside. Consequently the oil (B) is enabled to rise inside the suction pipe (12) as a vortex.

[020] During the rotating movement of the crank (5), the oil (B) in the section between the bottom end of the suction pipe (12) and the casing base tends to rotate together with the suction pipe (12). Reduction in pressure occurs in this section with the increasing speed of the oil (B) particles and the oil (B) in the base of the casing (2) is led to the center of this rotation. This will create vortices between the bottom end of the suction pipe (12) and the base of the casing (2). The created negative pressure increases from the base of the casing (2) towards the inlet of the suction pipe (12). This results in the leading of the oil (B) from the base of the casing (2) to the inlet of the suction pipe (12).

[021] With the deflector (9) which is the object of the present invention, the vortices formed between the lower end of the suction pipe (12) and the base of the casing (2) are deflected upwards and the flow-rate of the mass received from the bottom hole of the suction pipe (12) is increased.

[022] The deflector (9) has a suitably shaped outer surface conforming to the helical vortices generated between the lower end of the suction pipe (12) and the base of the casing (2) to facilitate the suction at the inlet of the suction pipe (12). Thus, the deflector (9), between the lower end of the suction pipe (12) and the base of the casing (2) provides the upward guiding of the flow lines coming from the vicinity of the base of the casing (2), in vortices without mixing.

[023] The ratio of the base area to the upper surface area and the shape of the lateral surfaces that connect the bottom surface to the top surface of the deflector (9) is determined by the producer according to the operating conditions of the compressor (1) in such a way that it does not prevent the formation and once formed the continuity of the vortices resulting from the differences in pressure during oil (B) suction.

[024] A conical shaped deflector (9) is utilized in the preferred embodiment of the present invention.

[025] A frustoconical shaped deflector (9) is utilized in another embodiment of the present invention.

[026] A deflector (9), the lateral surfaces of which are concave towards its middle axis is utilized in yet another embodiment of the present invention.

[027] A deflector (9), the lateral surfaces of which are convex towards the middle axis is utilized in yet another embodiment of the present invention.

[028] In another embodiment of the present invention, the deflector (9) comprises one or more channels (8) disposed on its side surfaces, helping to increase the pressure of the oil (B) as it is deflected towards the inlet of the suction pipe (12), shaped preferably guiding in spiral form from the bottom to the top so as to facilitate and not prevent the movement of the formed vortices.

[029] In yet another embodiment of the present invention, there is a distance of half of the deflector (9) height between the top surface of the deflector (9) and the inlet of the suction pipe (12).

[030] In yet another embodiment of the present invention, the middle axis of the deflector

(9) overlaps the middle axis of the suction pipe (12).

[031] In yet another embodiment of the present invention, the top surface area of the deflector (9) is smaller than the inlet of the suction pipe (12) so that the flow of oil (B) is not disturbed.

[032] In yet another embodiment of the present invention, during the dynamic movement of the motor (11) on the springs (13) or when the motor (11) does not operate but is transported, the deflector (9) protects the suction pipe (12) by preventing the motor (11) from hitting other components around it due to the elastic structure of the springs (13). In this embodiment, on the surfaces of the deflector (9), there are one or more holes (14) in shape and sizes so as to provide the suction or the discharge of the oil (B) at the base of the casing (2) and regulate the oil (B) flow, an opening (15) in shape and size that will not bump into the suction pipe (12) while the suction pipe (12) operates dynamically together with the motor (11), wherein the opening (15) provides the oil (B) sucked from the hole (14) and not sucked into the suction pipe (12) to be smeared on the exterior surfaces of the suction pipe (12) and discharging the excess oil (B).

[033] In an embodiment of the present invention, there are four rectangular holes (14) opened equidistantly on the periphery of deflector (9) which have convex exterior surfaces, for example in shape of a sphere or a bowl, close to the base of the casing (2) upon which it is attached.

[034] A deflector (9) having helical lateral surfaces, preferably widening from the bottom to the top, is utilized in another embodiment of the present invention. In this embodiment, the height of the deflector (9) lateral surfaces is in gradually decreasing form to decrease the local high pressure zones around the deflector (9), since high pressure zones are created around the suction pipe (12) when the height of the deflector (9) lateral surfaces from the base of the casing (2) remains the same. The deflector (9) has preferably an inclination of approximately 60° and the height of the lateral surfaces is in a decreasing form, as it gets closer to the center of the spiral shape.

[035] With the embodiment of the present invention, the compressor (1) can operate at low speed under hydrodynamic oiling conditions since the flow-rate of the oil (B) sucked by the suction pipe (12) is increased, the operational efficiency of the bearings and relatively the mechanical efficiency of the compressor (1) is increased and the compressor (1) operation duration can be extended since heating and wearing can be reduced. Furthermore the thermodynamic efficiency of the compressor (1) is enhanced and the interior temperature of the casing (2) is lowered as a result of the increased flow rate of the oil (B) transferred to the bearings, providing an additional contribution in discharging out the heat generated inside the compressor (1). The amount and the flow-rate of the oil (B) sucked by the help of the deflector (9) is increased as well as the damaging of the suction pipe (12) by impacts during transport resulting from the movement of the motor (11) suspended from the springs (9) inside the casing (2) is also avoided.

Claims

[001] A compressor (1) utilized in household appliances, preferably in refrigerators, comprising a motor (11), a casing (2) for holding the components within, a crank (5) transmitting the movement received from the motor (11), a suction pipe (12) situated inside the crank (5), providing the suction of the oil (B) inside the casing (2) and transferring it into the crank (5), and characterized by a deflector (9) fixed on the casing (2) so as to face the suction pipe (12) providing vortices to be created easily by the pressure differences during the suction of oil (B) and to be deflected upwards with the help of its surface shapes and once formed providing their continuity.

[002] A compressor (1) as in Claim 1, characterized by a deflector (9) having a conical shape.

[003] A compressor (1) as in Claim 1, characterized by a deflector (9) having a frus- toconical shape.

[004] A compressor (1) as in any one of the claims 1 to 3, characterized by a deflector

(9), the lateral surfaces of which are concave towards its middle axis.

[005] A compressor (1) as in any one of the claims 1 to 3, characterized by a deflector

(9), the lateral surfaces of which are convex towards its middle axis.

[006] A compressor (1) as in any one of the above claims, characterized by a deflector

(9), having a distance of half of its height between its top surface and the inlet of the suction pipe (12).

[007] A compressor (1) as in any one of the above claims characterized by a deflector

(9), the middle axis of which overlaps with the middle axis of the suction pipe (2).

[008] A compressor (1) as in any one of the above claims, characterized by a deflector

(9), having a top surface area that is smaller than that of the inlet hole (4) of the suction pipe (12).

[009] A compressor (1) as in Claim 1 characterized by a deflector (9), which protects the suction pipe (12) by preventing it from hitting other components around it and being damaged.

[010] A compressor (1) as in Claim 9, characterized by a deflector (9) having an opening (15) inside which the suction pipe (12) is positioned.

[011] A compressor (1) as in Claim 10, characterized by a deflector (9) having a convex exterior surface geometry, and four rectangular holes (14) opened peripherally and equidistantly close to the base of the casing (2).

[012] A compressor (1) as in Claim 9 to 11, characterized by a deflector (9) having helically shaped lateral surfaces that widen from bottom to top. A compressor (1) as in any one of the above claims, characterized by a deflector

(9), having one or more channels (8) on its lateral surfaces.