KR890002355B1 - Sealed type electrically operated compressor - Google Patents

Abstract

A sealed type electric compressor improves for increasing the discharge with multiple cylinders in a relatively small enclosure and mitigating the pulsation of high pressurized coolant from the cylinders. The sealed type electric compressor includes a motor part comprising a rotator (6), a stator (5), an impeller, and a rotating shaft (7) having an eccentric cam at its top portion, and compressing parts (11) comprising several cylinders (9) with pistons (10) connected to the eccentric cam with an eccentric roller (8). The compressing parts are arranged with the same intervals on the same surface of a frame (4), and the pistons connected with an eccentric roller are reciprocating in sequence. A T-shaped lubricant feeder (20) is fixedly mounted on the rotating shaft.

Description

Hermetic Electric Compressor

1 is a longitudinal cross-sectional view of the present invention.

2 is a cross-sectional view showing main parts of the present invention.

3 is a perspective view of the discharge loop tube.

4 is a discharge amount comparison table between a single compression mechanism and a plurality of compression mechanisms according to the present invention.

The present invention relates to an improvement of a hermetic light compressor in which the operation of a light fixture elastically supported in a hermetically sealed container is transmitted to the compression mechanism side by an eccentric rotation shaft having a lubricating oil-hop type oil supply structure. In particular, the present invention relates to a hermetic lamp compressor aimed at increasing the discharge amount by improving the discharge amount by improving the discharge amount by installing a plurality of cylinders in a relatively small volume sealed container and increasing the efficiency of the compressor. Scotch yoke or cone rod sealed light compressors that have been known so far can be installed in several cylinders, but there is a disadvantage in that the volume of the sealed container is relatively large. As such, when the sealed container is large, it is difficult to adopt a multi-cylinder method for a small compressor for a refrigerator or a room air conditioner. That's because the appearance of these devices increases, or at least their internal storage volume is reduced. So far, home appliances such as refrigerators and room air conditioners have all adopted reciprocating light compressors with only one set of cylinders. However, this type of compressor is not without any problem. That is, in the single cylinder structure, since only one discharge is performed for one rotation of the eccentric rotation shaft (crankshaft), as shown in FIG. 4, the pulsation of the flow rate and pressure due to the intermittent discharge is large, and the power consumption is inefficient. Various limitations are imposed on the size of the compressor, which is a major obstacle to the change in the capacity specifications of refrigerators and room air conditioners.

The present invention improves and supplements the shortcomings of the conventional hermetic reciprocating compression type light compressor as described above. The main feature is that a plurality of cylinders are installed and the pistons contained in the individual cylinders are rotated by the eccentric cam portion of a single rotating shaft. The rollers fitted cyclically allow the cylinder to reciprocate periodically, greatly increasing the discharge amount by the number (cylinder), and screwing the T-shaped oil supply pipe to the upper end of the rotating shaft, thereby realizing oil supply in each cylinder automatically. The high pressure discharge refrigerant is put together to reduce the pulsation and send it to the main discharge pipe. Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings made in accordance with the preferred embodiment. 1 and 2 show, in cross section, the arrangement of the invention in a Scotch yoke-type hermetic light compressor. In these figures, there is a frame elastically supported by the compression spring 3 in the inner sealed volume C formed by the coupling structure of the upper housing 1 and the lower housing 2, and the bottom of the frame 4. The lamp part which consists of the stator 5, the rotor 6, and the rotating shaft 7 is provided. When electric current flows to the lamp, the rotor 6 excited by the stator 5 rotates at high speed, and the rotational force is transmitted to the roller 8 fitted to the eccentric cam portion at the upper end of the rotary shaft via the rotation shaft 7, thereby (8) rotates together with the rotary shaft (7) and reciprocally drives a plurality of pistons (10) installed around the rollers by the cam motion to obtain a cooling compression effect.

According to the present invention, a plurality of reciprocating compressor units (11) are installed in the same horizontal position around the eccentric roller (8) provided on the upper surface of the frame (4) of the compressor unit (reclamation) consisting of a single cylinder and a piston. The mechanism was configured to exert a compression function sequentially on the same horizontal level by the cam action of the roller 8. Since a plurality of such compression mechanisms 11 are installed in the same horizontal plane, and the reciprocating etc. are sequentially performed by the cam action of the roller 8, the compression action is changed from the conventional intermittent type to the continuous type. The pulsation caused by the regular discharge is relatively reduced, and since a plurality of compression mechanisms are installed in the same horizontal plane, the volume of the sealed container can be used without change, and the model can be diversified. The compression coil spring 12 is elastically loaded between the front face of each cylinder 9 and the back face of the piston 10. This spring 12 is a piston when the pressure inside the cylinder 9 drops below or below the suction pressure due to expansion of the residual gas in the clearance volume immediately before the intake valve of the cylinder 9 opens and subsequent suction of the refrigerant through the intake valve. It plays the role of maintaining mutual contact between the slider 13 of (10) and the roller 8 of the rotating shaft 7.

In the piston pin 14 of the piston 10, another compression coil spring 15 shot between the fork portions at both ends of the piston 10 and the slider 13 fitted in the middle of the piston pin 14 has a slider 13 roller. When sliding on the piston pin 14 by the frictional force with (8), a moderate elastic resistance is applied on the slider 13 to prevent excessive sliding due to friction or inertia, thereby reducing the axial pressure applied to the inner surface of the cylinder (8) and further smoothing the piston. Keep your workout. On the other hand, the suction gas enters into the sealed volume C through the main suction pipe 16, which in turn guides 21 of the het cover 20 through the U-shaped pipe 17, the silencer 18 and the suction silencer 19. Structure, which flows into the cylinder 9 through the head 22, the suction valve 23, and the compressed gas in the cylinder 9 are discharged through the head 22, the discharge valve 24, the head cover 20 The structure discharged to the silencer 25, and the discharge gas from the individual discharge silencer 25 collected in the discharge loop pipe 30 to reduce the pulsation, and then connected to the main discharge pipe 26 is the same as the conventional structure Do. In addition, the smooth oil supply to each of the moving parts is supplied by the impeller 28 in which the refrigeration oil 27 is installed inside the lower end of the rotating shaft 7, and a part thereof is supplied through the oil supply hole provided in the element of each rotating part. On the other hand, the remaining part continues to rise along the rotary shaft (7) to reach the T-type oil supply pipe 29 inserted in the upper end. The refrigeration oil thus reached is concentrated on each sliding part, that is, the cylinder 9 and the piston 10, the roller 8 and the slider 13, due to the centrifugal force caused by the rotation of the rotary shaft 7. This smoothly lubricates all rotation or sliding sides.

In the figure, 30 is an exposed loop tube, and 31 shows a discharge tube connected to the discharge side in each discharge silencer. 32 denotes a fixing cap which is mounted on the upper surface of the frame 4 so as to support the upper end of the rotating shaft 7 and prevent the rotating roller 8 from popping upward. 33 indicates a hole in which a screw on the upper surface of the frame 4 on which the fixing cap 32 is mounted is machined.

In summary, the present invention described above, while installing a plurality of the compression mechanism (11) in the same horizontally on the edge of the eccentric roller (8) while installing a larger number of compression mechanism in the existing sealed volume (not increasing the sealed volume) The discharge amount per stroke is greatly increased (see FIG. 4), and the pulsation of the discharge flow rate and the discharge pressure is remarkably reduced due to the continuous compression action. This reduction in pulsation ultimately significantly reduces vibrations and noise from intermittent discharge of high-pressure refrigerant. It also has the side effect of increasing the freezing capacity by maintaining a stable flow at a more uniform density. In addition, even if only a small change is made to the inner diameter of the cylinder or the eccentric momentum of the roller (ie, the eccentricity of the rotating shaft), the discharge flow rate is largely changed, so that the design of the sealed volume is not necessary. Compressor coverage is extended. In addition, smooth lubrication of each moving part reduces frictional resistance between the moving parts, thereby reducing power consumption and extending mechanical life.

Claims (1)

In a hermetic light compressor comprising a light fixture composed of a rotor, a stator and a rotating shaft having an impeller therein and an eccentric cam formed on an upper end thereof, and a compression mechanism composed of a piston supported by the cam and a cylinder for receiving the piston, A plurality of compression mechanisms composed of a cylinder 9 and a piston 10 on the same plane of the upper surface of the frame 4 centered on the eccentric roller 8 are rotatably fixed to the upper end of the rotating shaft 7 ( 11) arranged at equal intervals, all the piston 10 is always in contact with the eccentric roller (8) in order to reciprocate sequentially, and the T-shaped oil supply pipe 20 is fixed to the upper end of the rotating shaft (7) Hermetic light compressor.

Images