WO2006085163A1

WO2006085163A1 - A compressor

Info

Publication number: WO2006085163A1
Application number: PCT/IB2005/054407
Authority: WO
Inventors: Husnu Kerpicci; Kemal Sarioglu; Baris Unal
Original assignee: Arcelik Anonim Sirketi
Priority date: 2004-12-27
Filing date: 2005-12-27
Publication date: 2006-08-17

Abstract

The present invention relates to a compressor (1) able to operate at low revolutions under hydrodynamic oiling conditions as a result of the fact that the flow-rate of the oil (B) sucked by the suction pipe (12) is increased, and the operation duration of which is extended since heating and impairment can be reduced by increasing the operational efficiency of the bearings and relatively the mechanical efficiency of the compressor (1).

Description

Description A COMPRESSOR

[001] The present invention relates to a compressor which comprises a suction pipe, the oil sucking 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 impairment and discharging the heat generated due to friction. Oiling the bearings in the compressors is accomplished by the suction of the oil 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 through the inlet below the oil suction pipe which rotates together with the crank shaft is transmitted to the upper bearings by proceeding on the interior 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 impairment 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 6182794, an oil guide that is inserted into the oil suction tube is described.

[005] The aim of the present invention is to design a compressor comprising an oil suction pipe with improved oil suction performance, the suction pipe of which rotates together with the crank shaft and helps the movable components to transfer heat with the oil it sucks.

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

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

[008] Figure 2 - is the schematic view of a transfer pipe fixed to a suction pipe inside a casing that contains oil.

[009] Figure 3 - is the perspective view of a transfer pipe comprising two actuators fixed to a suction pipe.

[010] Figure 4 - is the bottom perspective view of a suction pipe comprising two actuators inside a protective guide with convex sides.

[011]

[012] 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. Actuator

9. Guide

10. Transfer pipe

11. Motor

12. Suction pipe

[013] 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) that provides ease of movement for the movable components and transfers the generated heat. In the preferred embodiment, oil (B) is used as the fluid.

[014] The compressor (1) comprises a motor (11), a casing (2) for holding the components within, a cylinder (3) providing the pumping of the refrigerant gas within, a piston (4) providing the compression of the refrigerant gas into the hole of the cylinder (3), 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 (6) to the connecting rod (6), a suction pipe (12) situated inside the crank (5), preferably having a conical shape tapered towards to the top, providing the suction of the oil (B) inside the casing (2) to be transferred into the crank (5), a transfer pipe (10) which transfers the oil to the top section of the crank (5) and one or more actuators (8) situated on the suction pipe (12), which rotate together with the suction pipe (12), providing the oil to be easily sucked in by the suction pipe (12) and the oil to easily rise on the exterior side surfaces of the suction pipe (12).

[015] A negative pressure is created in the middle section of the oil suction pipe (12) and the pressure values are high along the interior walls as the oil (B) is sucked in. The pressure values on the exterior walls of the suction pipe (12) are lower than that of the interior walls. Consequently the oil (B) rises along the interior walls of the suction pipe (12). Oil rises as a helical vortex along the interior walls of the suction pipe (12).

[016] During the rotating movement of the crank (5), the oil (B) in the section between the bottom end of the suction pipe (12) and base of the casing (2) 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 chamber is guided to the center of this rotation. This creates helical vortices between the bottom end of the oil (B) suction pipe (12) and the base of the compressor (1). Negative pressure created increases from the lower side surfaces of the casing (2) towards the inlet of the oil suction pipe (12). This results in the guiding of the oil (B) from the lower side surfaces of the casing (2) to the inlet of the oil suction pipe (12). The actuator (8) enhances this guiding effect.

[017] In an embodiment of the present invention, actuators (8), in suitable number and position relative to the rotation speed of the suction pipe (12), having twists in accordance with the entrance and exit angles, blade length and width or operating conditions not preventing the creation of vortices during oil (B) suction as a result of the pressure differences and once created not preventing their continuity, are utilized.

[018] In an embodiment of the present invention a actuator (8) shaped like a propeller is utilized.

[019] In yet another embodiment of the present invention, the compressor (1) comprises a guide (9) fixed on the casing (2) so as to face the suction pipe (12), providing the oil (B) to reach the suction pipe (12) from the base of the casing (2) and allowing the vortices created by the pressure differences during suction of oil to be guided upwards with the help of its surface forms and once created providing their continuity. In this embodiment, one or more actuators (8), situated inside the protective convex guide (9), on the side surfaces of the suction pipe (12), inside the volume created by the guide (9) for providing to increase the pressure of the oil (B) by mixing, facilitating and not preventing the motion of the vortices to be created, are utilized.

[020] The crank (5) which transmits the rotating motion of the motor (11) so that the connecting rod mechanism (6) and the piston (4) move linearly, turns together with the circular motion of the rotor to which it is fixed by snap-fitting. As the oil suction pipe (12), which is preferably fixed to the crank by snap-fitting, moves circularly together with the crank (5), provides the suction of the oil (B) in the casing (2) with the help of the created forces. The forces created by the rotation of the crank (5) allow the oil (B) to cling to the crank (5) walls and provide the oil (B) to be transferred to the upper bearings. The oil (B) sucked in by the suction pipe (12), suction performance of which is enhanced by the actuator (8) flows into the transfer pipe (10) reaching the upper portion of the compressor (1). Consequently the oiling of the moving components within the compressor (1), facilitating movement by decreasing friction and transferring the heat generated during motion to the casing (2) with the help of the swung oil (B) and discharging outside is accomplished.

[021] 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 with the embodiment of the present invention. Furthermore the thermodynamic efficiency of the compressor (1) is enhanced and the interior temperature of the casing (2) is helped to be lowered since increasing the flow rate of the oil (B) transferred to the bearings provides an additional contribution in discharging the heat generated inside the compressor (1) to the outside.

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), and a suction pipe (12) situated inside the crank (5), providing the suction of the oil (B) inside the casing (2) transferring it into the crank (5), and characterized by one or more actuators (8) situated on the suction pipe (12) which rotate together with the suction pipe (12) providing the oil (B) to be easily sucked in by the suction pipe (12) and the oil (B) to easily rise on the exterior side surfaces of the suction pipe (12).

[002] A compressor (1) as in Claim 1, characterized by a suction pipe (12) having a conical shape tapered towards to the top.

[003] A compressor (1) as in Claim 1 and Claim 2, characterized by a actuator (8), in suitable number and position relative to the rotation speed of the suction pipe (12), having twists in accordance with entrance and exit angles, blade length and width or operating conditions, not preventing the creation of vortices during oil (B) suction as a result of pressure differences and once created not preventing their continuity.

[004] A compressor (1) as in Claim 3, characterized by an actuator (8) having a propeller form.

[005] A compressor (1) as in any one of the above claims, characterized by a guide (9) fixed on the casing (2) so as to face the suction pipe (12), providing the oil (B) to reach the suction pipe (12) from the base of the casing (2) and allowing the vortices created by the pressure differences during suction of oil (B) to be guided upwards with the help of its surface shapes and once formed providing their continuity and a actuator (8) situated inside the volume created by the protective convex guide (9), that provides mixing of the oil (B) to increase its pressure on the side surfaces of the suction pipe (12), facilitating the motion of the vortices to be created.