KR100202923B1 - Compressor with separating type piston - Google Patents

Abstract

The present invention relates to a compressor having a separate piston for improving the structure of the piston in a hermetic compressor having a means for use in a refrigerator and having a means for sucking and discharging the refrigerant inside the closed can.

The present invention relates to a hermetic compressor in which a piston, a connecting rod, and a big end are integrally assembled, and having a high-pressure generating device for releasing a refrigerant, constituting a crank mechanism together with a sphere: a cylinder in which a tapping portion 34a is formed at the center lower end. A piston 34 having a shape, a screw portion 35a engaged with the tapping portion 34a, and an accounting portion 35 on which a second lubrication hole 35b penetrates into a predetermined diameter is formed.

Therefore, the compressor of the present invention improves the fixing structure of the piston and the connecting rod in a separate type, so that the processing and assembly process of the compressor high pressure generating unit is simple, and the sphere can be supplied with sufficient lubricating oil, thereby preventing the efficiency and life of the compressor from being reduced. There is.

Description

Compressor with separate piston

1 is an exemplary view showing the internal structure of a hermetic compressor.

FIG. 2 is a perspective view showing the piston of FIG. 1 partially cut away. FIG.

3 is a cross-sectional view showing a piston according to a first embodiment of the present invention.

4 is a cross-sectional view showing a piston according to a second embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

10 compressor 11 closed can

12: eccentric shaft 12a: eccentric cam

13: cylinder 14: piston (conventional)

15 valve 16 valve body

17: sphere 18: connecting rod

19: Big End 25: Account (Primary)

25a: 1st lubrication opening 34, 44: piston (this invention)

34a, 44a, 45a: Tapping part 35, 45: Accounting part (this invention)

35a: threaded portion 35b, 45b: second lubrication tool

46: flat head screw C: caulking part

The present invention relates to a compressor, and more particularly to a separate piston that improves the structure of the piston to improve workability and lubricity in a hermetic compressor having a means used for a refrigerator and having a means for sucking and discharging a refrigerant inside the hermetic can. To a compressor having

In a refrigerator, a compressor is usually a means for converting a rotational force by energy into mechanical energy of a reciprocating motion, and a refrigerant having a low boiling point is brought into a high temperature and high pressure state through the compressor. Again the high pressure refrigerant is cooled in the condenser and becomes liquid, and once this liquid refrigerant is gasified in the cooler, one refrigeration cycle is completed.

1 is an exemplary view showing the internal structure of the hermetic compressor.

The compressor 10 has a structure in which a suction pipe (not shown) and a discharge pipe (not shown) of a refrigerant are bonded to the outside of the sealed can 11 and a high pressure generating means is mounted therein. The high pressure generating means can be roughly divided into a fixed part composed of a cylinder 13, a valve 15, a valve body 16, etc., and a moving part composed of a piston 14, a connecting rod 18, a big end 19, and the like. Can be.

Referring to the operation of the high-pressure generating means, the eccentric shaft 12 rotated by the motor induces a cam motion between the eccentric cam 12a and the big end 19 at the top thereof, and the cam motion is again connected to the connecting rod 18. The piston 14 in the cylinder 13 is reciprocated through, and the valve 15 is passively opened and closed by the pressure difference between both sides formed at this time to move the refrigerant in one direction.

In the hermetic compressor having the high pressure generating means, the refrigerant introduced into the suction pipe is filled into the sealed can 11 and then introduced into the cylinder 13 through the suction muffler, and the refrigerant compressed in the cylinder 13 passes through the discharge muffler. It is sent to the condenser (not shown) through the discharge pipe.

On the other hand, the piston 14, the connecting rod 18 and the big end 19 is a kind of crank mechanism as an integral assembly, and the piston and the connecting rod are fixed by pins for the purpose of transmitting a large and high output such as an automobile engine. The piston 14 and the connecting rod 18 is fixed to the sphere 17 in a relatively compact, low power transmission application such as a refrigerator compressor.

As the sphere 17 is applied to the small piston 14, the machining process is complicated, and in particular, the processing of the lubrication tool is difficult, and thus, the sphere 17 swinging and rotating does not receive sufficient lubricant to improve efficiency and life of the compressor. There is a disadvantage of deterioration.

Therefore, the present invention is to solve the above disadvantages, by improving the fixing structure of the piston and the connecting rod is simple to process and assembly process and the sphere can be supplied with sufficient lubricating oil is separated type to prevent the efficiency and life of the compressor is reduced It is an object to provide a compressor with a piston.

In order to achieve the above object, the present invention is directed to a hermetic compressor having a high-pressure generating device for delivering a refrigerant by constituting a crank mechanism together with a sphere, in which a piston connecting rod and a big end are integrally assembled. In this case, a cylindrical piston 34 having a tapping portion 34a formed at a lower end of the center, a screw portion 35a engaged with the tapping portion 34a, and a second lubrication hole 35b penetrating a predetermined diameter are formed. It provides a compressor having a separate piston comprising a seating portion (35).

In addition, the present invention, as a second embodiment, the cylindrical piston 44, the tapping portion 44a is formed on the side, the tapping portion 45a of the same standard as the tapping portion 44a and a predetermined diameter An accounting portion 45 having a second lubricating hole 45b formed therethrough and a flat head screw 46 simultaneously engaged with the tapping portions 44a and 45a without protruding to the side of the piston 44 are included. It provides a compressor having a separate piston.

At this time, the piston 44 and the seat 45 form one of the spring pins, taper pins, and parallel pins instead of forming the respective tapping portions 44a and 45a and fixing the flat head screws 46. It is also possible to fix with an interference fit by using.

Hereinafter, the present invention will be described in detail with reference to preferred embodiments based on the accompanying drawings.

First, FIG. 2 is a perspective view showing a partial cutaway of the piston of FIG. 1, detailing the manufacturing process and operation disadvantages.

The piston 14 is formed into a cast or forged piece integral with the seat portion 25 that houses the sphere 17, and the connecting rod 18 is welded to the sphere 17 to produce a unitary structure. The spherical member 17 is secured in any direction without being separated by the caulking portion C formed by caulking on the upper end of the seat portion 25.

At this time, the caulking portion (C) is formed in the first lubrication port (25a) at two points to supply the sphere (17). However, since oil is sucked and discharged only through the upper portion of the sphere 17, the lubrication of the sphere 17 is not smooth, and the piston 14 is relatively small, so it is difficult to process the caulking operation or a separate oil groove.

3 is a cross-sectional view showing a piston according to a first embodiment of the present invention.

The hermetic compressor to which the present invention is applied has the same configuration as the conventional hermetic compressor having its high pressure generating device for releasing pistons, connecting rods, and big-ends together, constituting a crank mechanism together with a sphere, and delivering refrigerant. Do.

As a first embodiment, a cylindrical piston 34 in which a tapping portion 34a is formed at a center lower portion thereof, a screw portion 35a engaged with the tapping portion 34a, and a second lubrication hole penetrating a predetermined diameter ( The accounting part 35 in which 35b) is formed is each shape | molded as a separate component.

At this time, when the tapping part 34a is completely penetrated by the piston 34, since the sealing means for blocking the leakage of the refrigerant in the cylinder is additionally required, it is preferable to process it so as not to penetrate it. The second lubrication tool 35b in the seat portion 35 is formed in plural in a predetermined position so that sufficient oil supply effect is also exerted on the center and the lower portion of the sphere 17 (FIG. 2).

On the other hand, the piston 34, which has a complex force such as inertial force and frictional force, generates a component force to be rotated in one direction during the reciprocating motion. If this is not absorbed by the rotation of the sphere 17 (if the spherical rotational frictional force is large), Since the part 35 is rotated and the screw part 35a may be loosened, countermeasures are required.

As a countermeasure, the spiral direction of the screw part 35a is the same as the rotation direction of the seat part 35 (for example, when the seat part 35 rotates to the right, the screw part 35a is formed with a right screw), As shown in Fig. 4, this drawback is solved.

4 is a sectional view showing a piston according to a second embodiment of the present invention.

As a second embodiment, a cylindrical piston 44 having a tapping portion 44a formed on its side, a tapping portion 45a having the same specification as the tapping portion 44a, and a second lubrication tool penetrating through a predetermined diameter A seat portion 45 having a 45b formed therein and a flat head screw 46 simultaneously engaged with the tapping portions 44a and 45a without protruding to the side of the piston 44 are provided.

In the present embodiment, the piston 44 and the seat 45 have a simpler shape as compared to FIG. 3, so that the process is easy and the seat 45 is not released by the rotation of the piston 44. Measures to prevent loosening of (46) are necessary. Unlike the threaded portion 35a (FIG. 3), the flat head screw 46 has a weak force acting on the piston 44 so that the countermeasure for preventing loosening is simple.

At this time, each of the piston 44 and the seat 45 forms one of a spring pin, a taper pin, and a parallel pin, instead of forming the tapping portions 44a and 45a and fixing the flat head screw 46. It is also possible to fix with an interference fit by using. These pins are press-fitted while maintaining a tolerance such that they do not protrude to the outer circumferential surface of the piston 44 by the component force according to the reciprocating motion of the piston 44.

On the other hand, in either case of FIG. 3 or FIG. 4, since the seat portions 35 and 45 are separated, it is easy to process the plurality of second lubrication holes 35b and 45b at a predetermined position from the side surface. .

In addition, instead of caulking on the inner surface of the piston 14 having a narrow space as in the prior art, a process of inserting the sphere 17 and forming the caulking portion C before mounting the seat portions 35 and 45 may be performed. Caulking process can be facilitated.

As described above, the compressor having the separate piston of the present invention improves the fixing structure of the piston and the connecting rod to the separate type, thereby simplifying the processing and assembling process of the high pressure generating unit of the compressor, and the sphere can be supplied with sufficient lubricating oil. It is effective to prevent the reduction.

While the invention has been shown and described with reference to certain preferred embodiments, it will be understood that the invention can be variously modified and modified without departing from the spirit or scope of the invention as set forth in the following claims. Those skilled in the art can easily know that.

Claims (3)

In a hermetic compressor having an integrated piston, connecting rod, and big end, a crank mechanism together with a sphere, and a high pressure generating device for delivering refrigerant: a cylindrical piston having a tapping portion 34a formed at the center lower end thereof. And a seating portion (35) formed with a screw portion (35a) engaged with the tapping portion (34a) and a second lubrication hole (35b) penetrating at a predetermined diameter. compressor. In a hermetic compressor having an integrated piston, connecting rod, and big end, and having a high-pressure generating device for releasing a refrigerant together with a sphere, which constitutes a crank mechanism: a cylindrical piston having a tapping portion 44a formed on a side surface thereof ( 44, a tapping portion 45a having the same specification as the tapping portion 44a, and a seat portion 45 formed with a second lubrication hole 45b penetrating a predetermined diameter, and a side surface of the piston 44. And a flat head screw (46) which does not protrude and engages simultaneously with the tapping portion (44a) (45a). 3. The pin (44) and the pin (45) are spring pins, taper pins, and parallel pins instead of forming the respective tapping portions (44a) and (45a), and fixing the flat head screws (46). Compressor with a separate piston, characterized in that for fixing by interference fit using any one of.