KR970001139B1 - Means for preventing wear in the transformal working members of hermetic compressor - Google Patents

Abstract

The abrasion preventing device of conversion mechanism in a closed electric motor compressor is capable of supplying a sufficient lubricating oil upon operation of the compressor to thereby prevent a slider and a slider shell which constitute the conversion mechanism from being abrasive. The abrasion preventing device comprises: a slider(46A) slidably coupled with the interior of a slider shell(47) and having a fixed hole(44) through which a splash bar(41) on the top end of a crank shaft(43) is passed; and first and second inducing grooves(49A,49A') formed on the both sides of the fixed hole(44), connected to first and second oil grooves(45A,45A') formed on the peripheral surface of the both sides of the slider(46A) to minimize the contact area with the slider shell(47), and for guiding oil(O) splashed from the splash bar(41).

Description

Anti-wear device of conversion mechanism of hermetic electric compressor

1 is a cross-sectional view of a typical hermetic electric compressor.

2 is an exploded perspective view of a conventional conversion mechanism.

3 is a cross-sectional view illustrating the operation of the conventional conversion mechanism.

4 is a slider perspective view of the conversion mechanism part to which the present invention is applied.

Figure 5 is a plan sectional view explaining the operation of the mechanism to which the present invention is applied.

* Explanation of symbols for main parts of the drawings

3: motor portion 4,4A: conversion mechanism portion

5 compressor section 41 scattering sphere

43: crankshaft 44: fixing hole

45,45A, 45A ': Oil groove 46,46A: Slider

47: Slider shell 49A, 49A ': guide groove

C: Slider center axis θ: Slope angle of guide groove with respect to slider's center axis

O: oil

The present invention relates to an abrasion preventing device of a conversion mechanism part of a hermetic electric compressor, and in particular, to provide sufficient lubrication during operation of the compressor to prevent wear of the slider and slider shell constituting the conversion mechanism part, thereby prolonging service life and improving operational reliability. It is done.

The hermetic electric compressor is for sucking, compressing and discharging the inner medium constituting a predetermined cooling cycle. The constitution includes a hermetically sealed housing 1 and a frame provided at approximately the center of the housing 10 as shown in FIG. (2) and the motor unit (3) consisting of a stator (31) and a rotor (32) to be installed at the lower part of the frame (2) to generate a rotational force, and linearly reciprocating the rotational movement of the motor unit (3). Compressor mechanism 4 for converting motion and compression consisting of cylinder head 51, head cover 52, and piston 53 to suck, compress, and discharge refrigerant in connection with the operation of the converting mechanism 4; It consists of the base 5.

FIG. 2 is an exploded view of the converter mechanism 4, which is fixed to the center of the rotor 32 and has a scattering ball 41 at the upper portion thereof so that the oil O inside the housing 1 during rotation. It has a crank shaft 43 for sucking and scattering through the suction passage 42, and a fixing hole 44 through which the scattering holes 41 are installed, and a cylindrical shape in which an oil groove 45 is formed on the center outer circumferential surface thereof. The slider 46 and the slider 46 are inserted so that sliding is possible, and the outer side is comprised by the slider shell 47 by which the piston 53 was welded and fixed.

Since the crankshaft 43 fixed to the rotor 32 rotates when the electric motor part 3 rotates, the electric compressor of this structure has the slider 46 of the outer surface of the scattering ball 41 which eccentrically rotates on the upper part. ) Reciprocates the piston 53 in front of the slider shell 47 while sliding the inside of the slider shell 47 to suck, compress, and discharge the refrigerant, wherein the oil O contained in the bottom of the housing 1 ) Is supplied to the converter mechanism 4 and the compressor 5 along the suction cylinder 42 by the centrifugal force of the flying ball 41 eccentrically communicating with the crankshaft 43.

However, the problem with this conventional configuration is that the oil O is not sufficiently supplied between the converter mechanism 4, in particular, the slider 46 and the slider shell 47 during operation of the motor-driven compressor, causing extreme wear to their contacting portions. Is generated.

3 is a view illustrating an operation state of the conventional transducer tool 4, and oil O sucked up through the flying holes 41 at the time of rotation of the crankshaft 43 is guide hole 48 of the slider shell 47. As shown in FIG. And flows between the oil groove 45 of the slider 46 to provide lubrication between the slider 46 and the slider shell 47.

However, since the oil groove 45 for supplying the oil O between the slider 46 and the slider shell 47 is located at the center of the slider 46, both sides thereof, that is, the slider 46 and the slider shell 47, are provided. As a result of the structurally wide contact area, as well as the oil (O) is not effectively supplied to the contact surface, in particular, extreme wear occurs in the outer contact section (L) of the slider 46 and the slider shell 47.

This wear eventually results in noise generation during the operation of the motor-compressor, the day of the week when the failure occurs, and at the same time, the life of the motor-driven compressor itself is shortened.

In view of the above problems, the present invention provides an abrasion preventing device of a hermetic electric compressor capable of proactively preventing wear, noise, and loss of function by supplying sufficient oil between slider shells on both sides of the conversion mechanism. Has its purpose.

In order to achieve the above object, in the present invention, oil grooves are formed at both sides of the fixing hole of the slider to minimize the contact area with the slider shell and to improve the oil supply efficiency.

4 shows the slider 46A to which the present invention is applied, and its configuration includes oil grooves 45A and 45A 'formed around both sides of the fixing hole 44 through which the flying holes 41 pass, and the oil groove. It consists of guide grooves 49A and 49A 'formed in the longitudinal direction on both sides of the fixing hole 44 so as to be connected to 45A and 45A'. Here, the guide grooves 49A and 49A 'are predetermined with respect to the central axis C of the slider 46A so that the oil O can be effectively introduced by the centrifugal force from the scattering ball 41 rotating in the clockwise direction. It is preferable to form so as to have an inclination angle (theta).

For convenience of explanation, the same member code with A is used for the same parts and members as in the prior art.

According to the present invention having the above configuration, the slider 46A constituting the converter mechanism portion 4A is slid into the slider shell 47, and the fixing hole 44 is provided with the flying holes 41 of the crank shaft 43. It is installed through and converts the rotational motion of the electric motor unit 3 into the linear motion of the compressor unit 5 as in the prior art.

However, in the present invention, the oil O scattered from the scattering port 41 along the suction passage 42 of the crankshaft 43 is effectively supplied between the slider 46A and the slider shell 47, thereby providing sufficient lubrication. Wear of the parts is actively prevented.

That is, the slider 46A to which the present invention is applied has the same length as the conventional slider 46, but since the oil grooves 45A and 45A 'are formed at both sides, the contact area with the slider shell 47 is reduced and worn. Occurrences can be minimized.

In addition, since the crankshaft 43 rotates in the clockwise direction during operation of the electric compressor, the scattering ball 41 also rotates eccentrically in the clockwise direction, in which the oil O is scattered as shown in FIG. 5. The oil groove formed around the slider 46A after being guided to both sides in the longitudinal direction of the slider 46A along the guide grooves 49A and 49A 'formed to have an inclination angle θ in the scattering direction at the top of 45A, 45A '), the oil (O) supply efficiency between the slider 46A and the slider shell 47 is maximized.

As described above, the present invention minimizes the contact area between the slider 46A and the slider shell 47 and maximizes the oil supply efficiency. Therefore, the present invention has a wide range of effects such as preventing wear and noise, thereby improving operational reliability and extending the service life. There is.

Claims (2)

In the hermetic electric compressor consisting of the electric motor unit 3 and the compressor unit 5 to perform refrigerant compression, it is connected to the crank shaft 43 which receives the rotational force from the rotor 32 of the electric motor unit 3 and rotates. Guide grooves 49A and 49A 'formed on both sides of the coupling hole 44 in the center on the slider 46A inserted into the slider shell 47 connected to the piston 53 for compressing the refrigerant. And, each oil groove (45A, 45A ') formed on both sides so as to be connected through the guide groove (49A, 49A'). The guide grooves 49A and 49A 'are formed so as to have a predetermined inclination angle θ with respect to the central axis of the slider 46A to guide the oil O scattered by the centrifugal force effectively. A wear protection device for converting mechanism part of hermetic electric compressor.