KR100620031B1 - Reciprocating compresor having the thrust-bearing of a inforced lubricating type - Google Patents

Abstract

The present invention relates to a reciprocating compressor having a lubrication-type thrust bearing, comprising: an electric motor installed inside a closed casing and generating power by receiving power; A crankshaft having a rotational force transmitted from the electric motor and having an eccentric portion formed in an eccentric state at an upper end thereof and a balance weight corresponding thereto; A connecting rod having one end connected to the eccentric part to convert the eccentric rotational motion of the eccentric part into a reciprocating linear motion; A piston connected to the other end of the connecting rod and reciprocating linearly; A cylinder which sucks the refrigerant gas and compresses and discharges the refrigerant gas as the piston is inserted and reciprocated to slide; In the reciprocating compressor including a frame provided with the crankshaft through the thrust bearing rotatably supporting the balance weight, the thrust bearing is in contact with the bottom portion of the balance weight when the crankshaft rotates. A plurality of oil pumping grooves are formed to extend from the outer circumferential surface to the inner circumferential surface and are arranged to be spaced apart on the outer circumference so as to pump the oil flowing out to the outside by viscous friction again, thereby enhancing lubrication in the thrust bearing to reduce friction loss. Provided is a reciprocating compressor having a lubricated reinforced thrust bearing that can be reduced.

Description

Reciprocating compressor with lubrication-enhanced thrust bearing {RECIPROCATING COMPRESOR HAVING THE THRUST-BEARING OF A INFORCED LUBRICATING TYPE}

1 is a longitudinal cross-sectional view for explaining the configuration of a conventional reciprocating compressor;

2 is a longitudinal sectional view of a reciprocating compressor having a lubrication type thrust bearing according to a preferred embodiment of the present invention;

FIG. 3 is a schematic perspective view for explaining a first embodiment of the thrust bearing of FIG. 2;

4 is a schematic perspective view for explaining a second embodiment of the thrust bearing of FIG.

5 is a schematic perspective view for explaining a third embodiment of the thrust ring of FIG.

<Description of the symbols for the main parts of the drawings>

100,200,200 ', 300: Thrust bearing 110,210,210', 310: Oil pumping groove

213,213 ', 313: Outer groove 215,215', 315: Inner groove

500: oil storage channel C: direction of crankshaft rotation

R: Radial direction of thrust bearing S: Arrangement direction of oil pumping groove

θ: angle between R and S

 The present invention relates to reciprocating compression, and more particularly, to a reciprocating compressor having a lubrication type thrust bearing capable of actively forming an oil film in a thrust bearing of a reciprocating compressor and maintaining the oil film formed for a long time.

Generally, a reciprocating compressor is a compression device used for compressing a refrigerant as an element constituting a cooling cycle of various cooling devices such as a refrigerator or an air conditioner.

1 is a longitudinal cross-sectional view for explaining the configuration of a conventional reciprocating compressor.

The reciprocating compressor includes a main body 1 integrated by an upper chamber 1a and a lower chamber 1b, a frame 3 elastically supported by a plurality of springs 2 in a space in the main body 1, The motor 4 which consists of the stator 4a fixed to the lower end of the frame 3, and the rotor 4b rotatably installed in such a stator 4a, and which generate | occur | produces a driving force, and the rotor of the electric motor 4 ( 4c) is installed in the shaft hole (3 ") of the frame (3) in the press-fitted state and the crankshaft (5) and the crankshaft (5) which is rotated under the driving force of the electric motor (4) and rotated The propeller 6 which pumps the refrigeration oil while rotating together when the shaft 5 rotates, and is formed eccentrically with respect to the shaft center on the upper end of the crankshaft 5 so as to rotate eccentrically when the crankshaft 5 rotates. Core chain 7 and the weight chain balance weight 7 'corresponding to the eccentricity of the eccentric portion 7, and the crankshaft (5) and the eccentric portion (7) formed in succession, the flow path (8) for guiding the coolant oil pumped by the propeller (6) to the top, and one end is connected to the eccentric portion (7) Connecting rod 9 for converting the eccentric rotational power of the linear reciprocating movement force, the cylinder 10 attached to the upper end side of the frame 3, and the cylinder 10 in a state connected to the other end of the connecting rod 9 And a head 12 which is inserted in the slide and sucks the refrigerant gas into the cylinder 10 or discharges the compressed refrigerant gas into the cylinder 10 while receiving a movement force through the connecting rod 9. .

When power is applied to the reciprocating compressor, an induction current is generated between the stator 4a and the rotor 4b constituting the electric motor 4, so that the rotor 4b rotates. The crankshaft 5 rotatably installed in the frame 3 is rotated by receiving the rotational force according to the rotation of the rotor 4b. The bottom surface of the balance weight 7 ′ of the rotating crankshaft 5 is in contact with the frame 3, and the contact portion, that is, the frame upper surface portion 3a surrounding the crankshaft 5 of the frame 3. The thrust bearing 3 in the form of a ring is installed.

When the crankshaft 5 rotates as described above, the eccentric portion 7 installed at the upper end thereof rotates in an eccentric state. At this time, the connecting rod 9 having one end connected to the eccentric portion 7 is connected to the eccentric portion 7. The eccentric rotational force is converted into a linear movement force and transmitted to the piston 11 that is slidably inserted into the cylinder 10 attached to one side of the frame 3. As a result, the piston 11 repeatedly inserts and retracts into the cylinder 10 while linearly reciprocating, and as a result, the cylinder 11 passes through a refrigerant suction pipe (not shown) of the head 12 installed outside the cylinder 10. 10) After the refrigerant gas is sucked into and compressed, it is discharged again through the refrigerant discharge pipe (not shown).

When the refrigerant gas is sucked, compressed, and discharged as described above, the propeller 6 installed at the lower end of the crankshaft 5 rotates with the crankshaft 5 to pump the refrigeration oil in the main body 1, and the pumped refrigeration oil is pumped. The refrigerator moves vertically to the upper side with the guide of the integrated flow path 8 successively connected to the eccentric portion 7 formed on the body and the top of the crankshaft 5 and then scatters to the outside while forming a constant diameter. It is lubricated by oil and cooled at the same time.

On the other hand, the frame 3 inside the main body 1 integrated by the upper chamber 1a and the lower chamber 1b is supported by the plurality of springs 2 on the main body 1, which drives the electric motor 4. As the crankshaft 5 rotates, the vibration of each mechanism part is attenuated by each spring 2.

In such a conventional reciprocating compressor, there is a problem that friction loss due to relative rotation or movement between the mechanism parts lowers the overall efficiency of the compressor.

In particular, among these frictional losses, the frictional loss between the bottom of the balance weight 7 'and the thrust bearing 3' provided on the upper surface of the frame 3 is found to be about 16% of the total frictional loss.

This friction loss is despite the fact that the oil is scattered through the flow path 8 as described above, which is according to the present situation in which the scattered oil stays once in the thrust bearing 3 '.

Therefore, in order to improve the efficiency of the entire compressor by reducing the friction loss, the need for a compressor having a thrust bearing capable of actively forming an oil film and keeping the pre-formed oil film for a long time to reduce the friction loss is the most frequent emergence. have.

In view of the necessity as described above, the present invention is to reintroduce oil into the thrust bearing to actively form an oil film and to maintain the oil film formed continuously to reduce the friction loss in the thrust bearing lubrication type thrust It is an object to provide a reciprocating compressor having a bearing.

 In order to achieve the above object, the reciprocating compressor having a lubrication-type thrust bearing according to the present invention is installed in the sealed casing and the electric motor to generate a rotational force by receiving power; A crankshaft having a rotational force transmitted from the electric motor and having an eccentric portion formed in an eccentric state at an upper end thereof and a balance weight corresponding thereto; A connecting rod having one end connected to the eccentric part to convert the eccentric rotational motion of the eccentric part into a reciprocating linear motion; A piston connected to the other end of the connecting rod and reciprocating linearly; A cylinder which sucks the refrigerant gas and compresses and discharges the refrigerant gas as the piston is inserted and reciprocated to slide; In the reciprocating compressor including a frame provided with the crankshaft through the thrust bearing rotatably supporting the balance weight, the thrust bearing is in contact with the bottom portion of the balance weight when the crankshaft rotates. Reciprocating type lubrication type thrust bearing with lubrication type thrust bearing, characterized in that a plurality of oil pumping grooves are formed to extend from the outer circumferential surface to the inner circumferential surface and to be spaced apart on the outer circumference so as to pump oil flowing out to the outside by viscous friction Provide a compressor.

Hereinafter, a reciprocating compressor having a lubrication type thrust bearing according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Hereinafter, the same reference numerals are assigned to the same components as those shown in FIG. 1, and detailed description thereof will be omitted.

2 is a longitudinal cross-sectional view of a reciprocating compressor having a lubricated reinforced thrust bearing according to a preferred embodiment of the present invention.

Thrust bearings (100, 200, 200 ', 300) having an enhanced lubrication function according to an exemplary embodiment of the present invention are provided with a balance weight installed on an upper end of the crankshaft (5) rotatably inserted into the shaft hole (3 ") of the frame (3). It is provided in the frame upper surface part 3a so that the bottom surface of 7 'may be contacted.

The thrust bearings 100, 200, 200 ′, 300 have a ring shape, and an oil storage channel 500 in which the upper surface portion 3a is continuously recessed is formed on the outer circumference of the thrust bearings 100, 200, 200 ′, 300. .

Furthermore, oil pumping grooves 110, 210, 210 ', and 310 are formed in the thrust bearings 100, 200, 200', and 300 to reduce and reduce power loss due to friction with the balance weight 7 'by forming and maintaining an oil film. It will be described in more detail with reference to FIG.

First, the first embodiment of thrust bearing will be described with reference to FIG. 3.

3 is a schematic perspective view for describing a first embodiment of the thrust bearing of FIG. 2.

As illustrated in this figure, the thrust bearing 100 actively reintroduces oil flowing out to the outside by viscous friction with the bottom portion of the balance weight 7 ′ when the crankshaft 5 rotates. An oil pumping groove 110 for pumping is formed.

The oil pumping groove 110 starts at the outer circumferential surface of the thrust bearing 100 and extends to the inner circumferential side, that is, the shaft hole 3 ", and is not connected to the shaft hole 3". In addition, the oil pumping groove 110 is arranged spaced apart on the outer circumference of the thrust bearing 100, it is formed in plurality.

Furthermore, each of the oil pumping grooves 110 is formed to have an arrangement direction S inclined along the rotational direction C of the crankshaft 5 with respect to the radial direction R of the thrust bearing 100. Here, the angle θ formed between the radial direction R of the thrust bearing 100 and the arrangement direction S of the oil pumping groove 110 has an acute angle.

In addition, each of the oil pumping grooves 110 is formed by narrowing the cross-sectional area of the thrust bearing 100 from the outer circumferential surface side toward the inner circumferential surface and deeply recessed at the same time.

As the oil pumping groove 110 is formed in the thrust bearing 100 as described above, when the crankshaft 5 rotates, the bottom portion of the balance weight 7 ′ in the rotational direction of the crankshaft 5, that is, the balance weight ( 7 ') extends in the direction of rotation and draws oil introduced into the contaminated oil pumping groove 110 to the upper surface of the thrust bearing 100 by viscous friction (see oil flow direction O).

The oil pumping groove 110 surrounds the thrust bearing 100 and communicates with the concave oil storage channel 500 so that oil drawn into the upper surface of the thrust bearing 100 is smoothly supplied by the oil storage channel 500. The oil stored in the oil storage channel 500 is supplied through the flow path 8 to form an oil film and discharged once in the thrust bearing 100, and the detailed supply process of the oil is as described above.

Furthermore, as the oil pumping groove 110 is formed to be deeply recessed from the outer circumferential surface side of the thrust bearing 100 to the inner circumferential surface side, the oil flowing into the thrust bearing 100 by the oil pumping groove 110 is maintained for a longer time. There is an advantage to doing this.

Next, a second embodiment of the thrust bearing will be described with reference to FIG.

4 is a schematic perspective view for describing a second embodiment of the thrust bearing of FIG. 2.

First, referring to FIG. 4A, the oil pumping groove 210 formed in the thrust bearing 200 is divided into an outer groove 213 and an inner groove 215.

The outer groove 213 is recessed starting from the outer circumferential surface of the thrust bearing 200, and is inclined with respect to the radial direction R of the thrust bearing 200 to follow the rotational direction C of the crankshaft 5. .

The inner groove portion 215 is connected to the outer groove portion 213 and extends to the inner circumferential surface side of the thrust bearing 200 to be recessed and formed. Here, the inner groove 215 does not extend to the shaft hole 3 "as in the first embodiment. The recess depth of the inner groove 215 is different from the recess depth of the outer groove 213 and is viscous. It is formed deeper to hold oil introduced by friction for a longer time.

Further, the inner groove portion 215 is formed independently along the circumferential direction of the thrust bearing 200. In other words, all the inner grooves 215 are not communicated with each other because they are recessed at regular intervals in a predetermined circumferential direction.

As the inner groove 215 recessed deeper than the outer groove 213 is formed, the oil introduced into the thrust bearing 200 by the viscous friction with the balance weight 7 ′ can stay longer. Accordingly, the oil film formed on the thrust bearing 200 has an advantage that it is maintained for a longer time.

Figure 4 (b) shows another modification of the inner groove portion.

As illustrated here, the oil pumping groove 210 'formed in the thrust bearing 200' constitutes a radial direction R of the thrust bearing 200 to follow the rotational direction C of the crankshaft 5. The inner groove 215 ', which extends from the outer groove portion 213' recessed from the outer circumferential surface side of the thrust bearing 200 'in an inclined shape with respect to the crankshaft 5, in the rotational direction C It is injected with a larger cross-sectional area.

As a result, a wider space is provided along the inflow direction of the oil due to the viscous friction, so that the concave space of the inner groove 215 'for preservation of the oil can be more efficiently utilized.

Finally, a third embodiment of thrust bearing will be described with reference to FIG.

5 is a schematic perspective view for describing a third embodiment of the thrust bearing of FIG. 2.

As illustrated in the figure, the thrust bearing 300 is inserted into the inner circumferential surface starting from the outer circumferential surface and has an outer groove portion 313 having an inclined shape along the rotational direction C of the crankshaft 5, and such an outer groove portion. An oil pumping groove 310 extending from 313 and including an inner groove 315 communicating with each other is formed.

The inner groove portion 315 is continuously formed in the circumferential direction of the thrust bearing 300, and communicates with each of the outer groove portions 313 disposed on the outer circumference thereof, as shown in the previous embodiments. In addition, the inner groove 315 is formed to be recessed deeper than the outer groove 313.

According to the configuration of the oil pumping groove 310, by the viscous friction with the balance weight (7 ') during the rotation of the crankshaft (5) in each outer groove portion 313 disposed on the outer circumference of the thrust bearing (300) The re-inflowed oil flows along the rotational direction C of the crankshaft 5 along the deeply recessed and inner groove 315 formed in a circular shape.

As the oil flows along the rotational direction C of the crankshaft 5, the oil remains in the oil pumping groove 310 for a longer time without leaving the oil pumping groove 310 to deposit an oil film on the thrust bearing 300. There is an advantage to be formed.

 As described above, the reciprocating compressor having a lubrication type thrust bearing according to the present invention has an oil pumping groove extending from the outer circumferential surface side of the thrust bearing to the inner circumferential surface side, thereby forming a thrust bearing by viscous friction with the balance weight. The oil flowing out to the outside is actively reflowed to form an oil film.

Furthermore, these oil pumping grooves are formed deeper toward the inner circumferential surface side of the thrust bearing or are recessed to have a wider cross-sectional area along the rotational direction of the balance weight and communicate with each other so that the oil continuously rotates according to the rotation of the balance weight. Preservation of the oil introduced for a longer period of time ensures that the oil film formed is maintained continuously.

As described above, oil is actively re-introduced into the thrust bearing to form an oil film and the oil film is continuously maintained, thereby reducing the frictional loss in the thrust bearing and consequently reducing the input loss of the compressor, thereby reducing the overall compression efficiency of the compressor. This effect is improved.

Claims (9)

An electric motor installed inside the closed casing and generating power by receiving power; A crankshaft having a rotational force transmitted from the electric motor and having an eccentric portion formed in an eccentric state at an upper end thereof and a balance weight corresponding thereto; A connecting rod having one end connected to the eccentric part to convert the eccentric rotational motion of the eccentric part into a reciprocating linear motion; A piston connected to the other end of the connecting rod and reciprocating linearly; A cylinder which sucks the refrigerant gas and compresses and discharges the refrigerant gas as the piston is inserted and reciprocated to slide; In the reciprocating compressor including a frame is installed through the crankshaft and formed with a thrust bearing rotatably supporting the balance weight, The thrust bearing is recessed to extend from the outer circumferential surface to the inner circumferential surface and to be spaced apart on the outer circumference so as to pump oil flowing out to the outside by viscous friction with the bottom portion of the balance weight when the crankshaft rotates. Reciprocating compressor having a lubrication-type thrust bearing, characterized in that the oil pumping groove is formed. The method of claim 1, And each of the plurality of oil pumping grooves is formed to be inclined along a rotational direction of the crankshaft with respect to the radial direction of the thrust bearing. The method of claim 2, And each of the plurality of oil pumping grooves is formed to be narrowed toward the inner circumferential surface side from the outer circumferential surface side of the thrust bearing. The method of claim 3, The oil pumping groove is a reciprocating compressor having a lubrication-type thrust bearing, characterized in that the deeper concavity is formed from the outer peripheral surface side toward the inner peripheral surface side. The method of claim 2, The oil pumping groove is composed of an outer groove concaved from the outer circumferential surface, and an inner groove concave extending from the outer groove to the inner peripheral surface side region. The reciprocating compressor having a lubrication type thrust bearing, characterized in that the outer groove and the inner groove is recessed to a different depth. The method of claim 5, The inner groove portion is formed deeper than the outer groove portion, And the inner groove portion is discontinuously inserted at regular intervals between the inner circumferential surface and the outer circumferential surface such that the plurality of oil pumping grooves are formed so as not to communicate with each other. The method of claim 6, The inner groove portion is a reciprocating compressor having a lubrication-type thrust bearing, characterized in that the recess is formed with a larger cross-sectional area along the rotational direction of the crankshaft. The method of claim 5, The inner groove is formed deeper than the outer groove, The inner groove portion is a circulating type continuously concave at regular intervals between the inner circumferential surface and the outer circumferential surface of the reciprocating compressor having a lubrication type thrust bearing, characterized in that the plurality of oil pumping grooves are formed to communicate with each other. The method according to any one of claims 1 to 8, The frame is formed with an oil storage channel for storing the oil flowed in to surround the thrust bearing, The reciprocating compressor having a lubrication type thrust bearing, characterized in that the plurality of oil pumping groove is formed to communicate with the oil storage channel.

Images