KR20160127361A

KR20160127361A - Oil Pumping Structure of Hermetic Compressor

Info

Publication number: KR20160127361A
Application number: KR1020150058632A
Authority: KR
Inventors: 김종혁
Original assignee: 김종혁
Priority date: 2015-04-27
Filing date: 2015-04-27
Publication date: 2016-11-04

Abstract

The present invention relates to an oil pumping structure for a closed compressor. The purpose of the present invention is to provide a device for smoothly supplying a refrigerator oil leaking in a low speed rotation as the low speed rotation of a compressor is performed by driving of an inverter in order for the closed electric compressor used for a refrigerator for home use and a room air conditioner to save power consumption and be operated in a quite mode. According to the present invention, the oil pumping device improves a supply amount of the refrigerator oil by having two or more discharge holes of the refrigerator oil ascending by an oil sucking device in a spiral sphere. So, the oil is smoothly supplied to each friction driving unit in the closed compressor. Therefore, the oil pumping structure for a closed compressor can obtain reliability by largely improving friction and abrasion between the friction driving units forming the compressor so that the compressor drives in the low speed. Therefore, the refrigerator can be operated in the quick mode and can reduce the power consumption.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an oil pumping structure of a hermetic compressor,

[0001] The present invention relates to an oil pumping structure comprising a crankshaft and a oil suction device for transmitting a rotational force to a hermetic compressor for a freezer and a passage for the freezer, and a refrigerator oil in the hermetic container is fixed to the rotor To an oil pump system for supplying oil to a friction drive unit in a hermetic compressor using centrifugal force by rotation of a crankshaft

In particular, the oil pump structure of the present invention is designed to improve the power consumption and noise level of a refrigerator, such as a refrigerator, by employing an inverter motor at a rated frequency of 50 or 60 Hz (Hertz) Therefore, it is a structure designed so that refrigerator oil can be smoothly supplied to the frictional driving part by using the centrifugal force even at a variable frequency as low as 10 ~ 40 H z

The present invention relates to a hermetic compressor (see FIG. 1) for compressing a refrigerant for a refrigerator, and more particularly to a hermetic compressor for compressing a refrigerant for an oil pump 10 The structure of the oil pumping device 10 is a combination structure of the crankshaft 2 and the oil suction device 3. Fig. 1 shows the internal structure of the hermetic compressor (Fig. 1) The closed container 21 constituting the outer appearance of the hermetic compressor 1 comprises a lower container 22 and an upper container 23. The closed container 21 is provided with a cylinder block 1 And a stator 32 of a motor 31 is fastened to the cylinder block 1. The cylinder block 1 is supported by a spring 24 in the interior of the closed container 21, And through the center of the cylinder block 1, A bearing portion 2c of a cowling 2 is inserted into the bearing portion 2c of the crankshaft 2. A rotor 33 of a motor 31 is integrally installed by press- The crankshaft 2 is rotated by an electromagnetic interaction with the stator 32. An eccentric pin 2a is provided on the upper end of the crankshaft 2 to bear against the center of rotation of the crankshaft 2. [ A spiral orifice 2s is formed in the bearing portion 2c of the crankshaft 2 for lubrication of the bearing portion 2c and a passage of the freezer oil 25 in the bearing portion 2c of the crankshaft 2, And the freezer oil 25 on the bottom surface of the lower container 22 is connected to the first inner diameter 2d of the lower end of the crankshaft 2 by the oil passage 25a such as the spiral sphere 2s formed on the crankshaft 2, And an oil suction device 3 for rotating the crankshaft 2 is provided at the same time. By a propeller (3b) provided therein to thereby generate a centrifugal force of the suction the refrigerator oil (25)

The freezer oil 25 accumulated in the lower vessel 22 flows into the oil suction device 3 through the oil hole 3a of the oil suction device 3 immersed in the freezer oil 25 The refrigerating oil 25 thus introduced continuously receives the centrifugal force by the rotational force of the propeller 3b and moves to the upper portion of the oil suction device 3, The refrigerating machine oil 25 which has moved to the upper portion of the crankshaft 2 is guided through the first inner diameter 2d and the second inner diameter 2e of the crankshaft 2 communicated with the inner space of the oil suction device 3 Is discharged to the second transverse hole 2n and then supplied to the bearing portion 2c having the outer diameter of the crankshaft 2 along the spiral hole 2s and is continuously fed through the third transverse hole 2h and the longitudinal hole 2t Moves to the eccentric pin (2d) and is sprayed to the hermetic compressor friction drive part, thereby lubricating and cooling each drive part

2, the structure of the crankshaft 2 will be described in detail. A first inner diameter 2d for inserting the oil suction device 3 is formed at the lower end of the inner diameter of the crankshaft 2, The refrigerator oil 25 raised by the centrifugal force is lifted up by the second inner diameter 2e by the centrifugal force 3 and the foreign matter contained in the elevated refrigeration oil 25 is separated on one side of the second inner diameter 2e A second transverse hole 2n is formed in the upper end of the second inner diameter 2e to be opened to the outer periphery of the crankshaft 2 and is supported on the outer diameter side bearing 2c of the crankshaft 2. [ The lower end of the spiral sphere 2s is in communication with the second transverse hole 2n and the upper end of the spiral sphere 2s is in communication with the spiral sphere 2s formed on the eccentric pin 2b. (2t) and the third transverse hole (2h)

3 is a detailed view of the crankshaft 2 immersed in the freezer oil 25. The freezer oil 25 in the oil suction device 3 is rotated by the rotation of the crankshaft 2 in a parabolic shape The free surface of the freezer oil 25 sucked from the oil hole 3a of the oil suction device 3 inserted into the first inside diameter 2d of the crankshaft 2 The flow is an upward flow of the parabolic curve 6 pulled up by the centrifugal force due to the rotation of the crankshaft 2 and is released to the outside through the second transverse hole 2n at the second inner diameter 2e The crankshaft 2 and the oil sump device 3 are lifted up at a high rotation speed such as 50H z or 60H z (3000 or 3600 r / min), which is the frequency of the rated power source. The supply of the cold machine oil 25 to the friction drive portion by the centrifugal force is good by the oil pumping device 10

This operation is continuously performed during the operation of the compressor so that the lubrication and cooling of the respective driving parts can be continuously performed. On the other hand, the cylinder 1 provided with the compression chamber 1a is disposed in the cylinder block The piston 4 is installed in the compression chamber 1a and the piston 4 is connected to the eccentric pin 2b of the crankshaft 2 and the connecting rod 5 And a valve assembly 11 for controlling the flow of the refrigerant introduced into and discharged from the compression chamber 1a is installed at the tip of the cylinder 1. The hermetic compressor 1 and the valve assembly 11 When the crankshaft 2 is rotated by the operation of the motor 31 to drive the connecting rod 5, the piston 4 provided at the front end of the connecting rod 5 rotates inside the cylinder 1 To a predetermined stroke The

The refrigerant gas returned from the cooling system (not shown) into the closed container 21 in the suction stroke in accordance with the reciprocating movement of the piston 4 passes through the suction muffler 13 and is moved to the valve assembly 11, The suction valve is opened through the suction port 14a of the cylinder 1 and sucked into the cylinder 1a. The sucked refrigerant gas is compressed in the cylinder compression chamber 1a according to the compression stroke of the cylinder 1, The refrigerant is discharged through the discharge port 14b and then discharged to the cooling system (not shown), so that the entire refrigerating cycle is repeatedly performed

At present, in order to reduce the energy consumption in a refrigerator or the like, the refrigerator maintains a sufficient cooling air temperature without increasing the cooling temperature. However, when the cooling power is insufficient, the refrigerant is low in the hermetic compressor The use of the compressor is mainly used in appliances which have to be operated in a relatively quiet manner such as a refrigerator or an air conditioner. In this case, a motor that operates at a low rotational speed is also required It was done.

Accordingly, a brushless DC motor (hereinafter referred to as a BLDC motor) using an inverter is mainly used so as to rotate the motor 21 in the low frequency region. The variable speed BLDC motor 10 to 40 Hz, that is, about 600 to 2400 r / min per minute. As described above, the BLDC motor rotates the motor in the low frequency region, so that the speed can be varied. Accordingly, the speed of the crankshaft 2 The speed of rotation can also be reduced, resulting in reduced energy consumption and quiet operation

On the other hand, since the pumping system of the hermetic compressor compressor 25 raises the refrigerator oil 25 stored in the bottom of the hermetically sealed container to the upper friction drive portion, many centrifugal forces are used due to the rotation of the crankshaft 2. However, Since the centrifugal force is proportional to the square of the rotational speed of the crankshaft 2, the lower the rotational speed is, the smaller the force for lifting the freezer oil 25 becomes. Thus, The suction and supply of the freezer oil 25 can not be smoothly performed at the low-speed rotation with the oil pump apparatus 10 adapted to the frequency range of 60 Hz band, and the supply amount of the freezer oil to each friction drive section constituting the compressor The reliability of the refrigerator can not be secured due to a problem of wear reliability

In order to solve the above-mentioned problems, it is possible to provide a separate oil pumping device as shown in FIG. 4 to smoothly supply oil to each of the friction drive parts in the compressor. A mechanical oil pump system that lifts lubricant upward along the spiral sphere by the viscous action of the lubricant between the stator and the rotating slip where the sphere is installed. From the viewpoint of securing the amount of oil supply at low speeds, However, since the structure is extremely complicated compared to the oil pump system by centrifugal force and the number of parts is increased, there is a disadvantage that it is expensive and the assembling workability is also bad. The supply path becomes unstable due to the complicated passage path of the lubricant And the configuration becomes complicated and the number of parts increases and the cost increases was the assembling of fall

Another conventional oil pumping apparatus employs a system in which the outer diameter of the crankshaft is increased to improve the centrifugal force to supply the refrigeration oil. However, the increase in the outer diameter of the crankshaft increases the friction area and increases the amount of electricity consumed by the frictional force. The lubricating oil pump of the hermetic type compressor of the hermetic type compressor which is capable of efficiently raising the lubricating oil even at low speed rotation and also having a simple structure can be provided. System according to the present invention. Accordingly, in the present invention, the oil pumping device is newly constructed to sufficiently supply the refrigerating machine oil even at the low frequency as described above, thereby improving the lubricating and cooling power of the friction drive part of the hermetic compressor, thereby improving the reliability of the hermetic compressor Energy source And to realize the saving and silent Chemistry

1, the hermetically sealed compressor 21 of the present invention has a basic structure as in the prior art. That is, the hermetically sealed container 21 constituting the outer casing comprises a lower container 22 and an upper container 23, A refrigerator oil 25 is stored in an inner lower portion of the hermetically sealed container 21. A motor 31 composed of a stator 32 and a rotor 33 is provided in the hermetically sealed container 21 and a crankshaft 102 ) For compressing the refrigerant, and a valve assembly (11) for taking in / out the refrigerant from / to the compression element portion

5, the oil pumping device 110 of the present invention comprises a crankshaft 102 and an oil suction device 3, and a crankshaft 102 is connected to a main shaft portion 102k and an eccentric pin 2b. And the freezer oil 25 in the storage portion of the closed container 21 is supplied into the friction drive portion through the crankshaft 102 main shaft portion 102k and the crankshaft eccentric pin 2b portion by the rotation of the crankshaft 102 The oil suction device 3 includes a propeller 3b and is inserted into a first inner diameter 2d of the crankshaft main shaft portion 102k and is connected to a freezer oil The second inner diameter 102e is formed to be a passage of the crankshaft 2 eccentric from the conventional second inner diameter 2e to accommodate the second b transverse hole. And a first transverse hole 2m which extends in the direction of the pin 2b and which is the same as the conventional one for discharging the foreign substances contained in the elevated refrigeration oil 25 A second transverse hole 102n which is an opening for discharging the refrigerator oil 25 raised by the thrill to the outer diameter bearing portion 102c of the crankshaft 102 through the spiral hole 102s and a second inner diameter 102e The second b transverse hole 102p, which is another opening for discharging the refrigerating machine oil 25 raised by the centrifugal force to the outer diameter bearing portion 102c of the crankshaft, is connected to the second transverse hole 102n and the crankshaft 102 and the second b transverse hole 102p is formed through the second transverse hole 102n on the spiral sphere 102s

As shown in FIG. 7, the second b-transverse hole 102p is located at a lower portion of the spiral sphere 102s in the second b-transverse hole 102s as a method for increasing the supply / discharge of another refrigerator oil 25, The second c-transverse hole 202p is replaced with the second c-axis hole 102p and then discharged through the auxiliary spiral hole 202s and then joined to the main spiral hole 102s

As described above, in recent years, a hermetic compressor used for a domestic refrigerator or a room air cone has been required to conserve power and to reduce noise. In order to conserve power and to reduce noise, a low- The motor employed in this case rotates at a lower speed than in the prior art. As described in the present invention, since the oil pump apparatus is provided with two or more outlet ports of the freezer oil raised through the oil suction device in the spiral hole, It is possible to smoothly supply the oil to each of the friction drive parts in the compressor, thereby avoiding friction and wear between the friction drive parts constituting the hermetic compressor. As the refrigeration oil to the friction drive part is thus sufficiently supplied, As the cooling effect increases significantly, In addition to reducing the temperature of the condenser, it also has the effect of increasing the efficiency of the compressor itself. The closed compressor, which employs the oil pumping device that ensures wear reliability, can operate at low speed, In addition, by providing the oil pumping device, it is possible to smoothly perform the oil lubrication of each of the driving parts in the hermetic compressor. However, in the conventional example as well, the lubrication oil passing path It is possible to solve the problem that the supply becomes unstable because of the complicated structure, the complexity of the structure, the increase of the number of parts, the increase of the cost, and the poor assemblability

1 is a view showing the internal construction of a hermetic compressor according to the prior art;
2 - Conventional oil pumping device and crankshaft and oil suction device
Fig. 3 Rising and discharging phenomena due to centrifugal force of refrigerator oil
Another application example of the oil pumping device is shown in FIG.
Fig. 5 is a sectional view of the oil pumping device and the crankshaft of the present invention.
6 - Rise and Discharge Phenomena according to the Centrifugal Force of Refrigerator of the Present Invention
Fig. 7 is a schematic diagram of another oil pumping device and crankshaft structure of the present invention.

The embodiments of the present invention will be described in detail below. However, the present invention is not limited to the following embodiments unless departing from the gist of the present invention. The hermetic compressor of the present invention has the same basic structure as that of the prior art, The closed container 21 constituting the closed container 21 is composed of a lower container 22 and an upper container 23 and a freezer oil 25 is stored in an inner lower portion of the lower container 22. Inside the closed container, A crankshaft 102 fixed to the rotor 33 rotates and a compressor element including a cylinder 1 for compressing the refrigerant and a valve And an assembly 11

5, the oil pumping device 110 of the present invention comprises a crankshaft 102 and an oil suction device 3, and a crankshaft 102 is connected to a main shaft portion 102k and an eccentric pin 2b. And the rotation of the crankshaft 102 is generated by the power of the motor 31. By this rotation, the freezer oil 25 in the storage portion of the hermetically sealed container 21 is separated from the main shaft portion 102k and the crankshaft eccentric pin And the oil suction device 3 is provided in the crankshaft main shaft portion 102k so as to be inserted into the first inner diameter 2d of the lower inner end of the crankshaft main shaft portion 102k The second inside diameter 102e and the second inside diameter 102n which are openings for discharging the refrigerator oil 25 raised by the centrifugal force through the second inside diameter 102e to the outside diameter bearing portion 102c of the crankshaft, To the outside diameter bearing portion 102c of the crankshaft 102. The crankshaft 102 is provided with a crankshaft 102, 2b the lateral hole (102p) is provided with in the spa chiral sphere (102s)

The opened outlet for discharging the refrigerating machine oil 25 raised by the centrifugal force through the second inner diameter 102e to the outer diameter bearing portion 102c is called the second 2a transverse hole 102n and the second transverse hole 102n, The spiral sphere 102s is provided with two or more spiral holes 102s in the spiral sphere 102s such as a hole 102p and is connected to the spiral sphere 102s through the spiral sphere 102s, And the spiral sphere 102s provided in the shim pin 2b is constructed such that the pitch interval is short and the slope becomes gentle so that the centrifugal force due to the small number of revolutions makes the freezer oil 25 ) Can be absorbed to the upper side

The refrigerator oil 25 at the lower end of the oil suction device 3 inserted in the first inner diameter 2d receives the centrifugal force due to the rotation of the crankshaft 102 and the upward force due to centrifugal force And moves upward through the first inner diameter 2d and the second inner diameter 102e of the crankshaft 102. The upwardly elevated freezer oil 25 is formed into a parabolic shape 106 A part of the refrigeration oil 25 is discharged through the second transverse hole 102n and the discharged refrigerating oil 25 rises along the spiral sphere 102s and is further formed on the spiral sphere 102s A larger amount of refrigerant oil 25 discharged from the second b transverse hole 102p is discharged to the outside through the spiral sphere 102s so that the increased refrigerant oil 25 flows into the crankshaft 102. [ Is lifted through the longitudinal hole 2t communicating with the eccentric pin 2b and passes through the eccentric pin 2b The lubricating oil is supplied to the friction drive portion such as the piston 4 to continuously lubricate and cool the lubricating oil. In such an oil pumping device 110 having the refrigerator oil supply device, at least the crankshaft 102 Since the operation including the low-speed operation speed of 600 to 2400 r / min can be performed, the reliability of the wear of the hermetic compressor is ensured and the consumption of electric power is reduced so that low power consumption and quiet operation are possible

1-cylinder or cylinder block
1a- Compaction chamber
2- Crankshaft
2b-Eccentric pin
2c-
2d-first inner diameter
2e-second inner diameter
2m-first transverse hole
2n-second transverse hole
2h-third transverse hole
2k-crankshaft main shaft portion
2s-Spiral
2t-
3. Oil suction device
3a - oil hole
3b-propeller
4-piston
5-connecting rod
6- Parabolic rising flow of freezer oil
10-oil pumping device
11-valve assembly
12-valve cover
13- Suction muffler
14-Valve Plate
14a-inlet
14b-
21-Closed container
22-Lower container
23-Upper vessel
24-spring
25-freezer
31-motor
32-stator
33-rotor
102c-crankshaft bearing portion
102e - the second inner diameter
102k-crankshaft main shaft portion
102n-2a < / RTI >
102p-2b transverse hole
102s-Spiral
106-Parabolic rising flow of freezer oil
110-oil pumping device
202p-second c transverse hole
202s-secondary spiral

Claims

A crankshaft that rotates by driving a brushless motor capable of shifting the speed for compressing the refrigerant while the rotor is pushed in at the lower end of the crankshaft, Characterized in that two or more transverse holes, which are openings through which the refrigerating oil raised by the oil suction device is discharged into the spiral holes of the crankshaft, are provided on at least a spiral groove of the crankshaft in the oil pump device provided with the oil suction device And a refrigerating freezer employing the oil pumping device

The transverse hole provided as a first opening formed in the starting portion of the spiral groove and provided for supplying the refrigeration oil to the crankshaft bearing portion is formed symmetrically with the center of the first transverse hole and the crankshaft, The additional transverse hole formed is formed with an auxiliary spiral sphere communicating with the auxiliary spiral sphere, and the auxiliary spiral sphere is formed by an oil pumping structure