KR100307390B1 - Devices Reducing the starting Load for Scroll compressor - Google Patents

Abstract

PURPOSE: A device for reducing starting load of a scroll compressor is provided to reduce compression load by discharging gas in the process of compressing in case of starting. CONSTITUTION: In a device for reducing starting load of a scroll compressor, a discharge opening(18), to reduce starting load by communicating gas with a venting chamber in the process of compressing in case of starting, is formed between laps(9a) of a fixed scroll(9). A discharge valve, opening and shutting the discharge opening, is installed to the fixed scroll. When the discharge opening is more than one, each discharge opening is disposed on the circumference, to make compression load torque less than the motor-starting torque, and the position of the discharge opening has phase difference of 360 degrees on an involute curve.

Description

Devices Reducing the starting Load for Scroll compressor}

The present invention relates to a starting load reducing device of a scroll compressor, and in particular, a starting failure caused by a compression torque generated during the compression process larger than a motor starting torque when restarting in a state in which the suction discharge pressure becomes more than a constant equilibrium pressure after stopping operation. In order to prevent the discharge of the gas during the compression process during startup to reduce the compression load, it is to reduce the starting load.

In general, look at the structure of a conventional scroll compressor as shown in Figures 1 and 2,

First, as shown in FIG. 1, an airtight container 2 which is an exterior of the scroll compressor 1, a stator 3 generating magnetic force when power is applied to the scroll compressor 1, and the stator 3. The rotor 4 rotates by the magnetic force of the head, the drive shaft 5 that is press-fitted to the rotor 4 and rotates like the rotor 4, and the suction pipe is connected to the drive shaft 5 by a pivoting motion. Maintaining a rotating scroll (6) for compressing the refrigerant gas sucked into the sealed container (2) through, the upper frame (7) for supporting the rotating scroll (6), and the rotating scroll (6) Old dam ring (8) to be used for, and the upper surface of the rotating scroll (6), the wrap (6a) formed in the involute curve, the fixed scroll (9) in engagement with the wrap (6a) to form an extrusion chamber, The fixed scroll (9) is mounted and fastened to the edge of the upper frame (7) by bolts, the back of the swing scroll (6) drive shaft (5) A boss 10 eccentrically coupled to the boss 10, an end portion of the driving shaft 5 coupled to the boss 10, a driving pin 5a protruding a predetermined amount eccentrically, the driving pin 5a and the pivoting scroll ( The drive bush 11 interposed between the bosses 10 of 6), the oil supply passage 5b formed so as to terminate the whole drive shaft 5, and the drive shaft 5 at the inner side in the longitudinal direction of the drive shaft 5; In the lateral inward direction of the journal bearing groove (not shown) in communication with the oil supply passage (5b) and selectively correspond to, and in communication with the rectangular oil supply port (not shown) of the upper frame (7), Both end surfaces of the rotor are composed of balancing weights 4a and 4b for canceling an unbalanced force such as the center of the drive shaft and the swinging scroll 6 eccentrically.

In the drawings, reference numerals denote the suction pipe 12, the discharge port 13, the discharge cover 14, the reverse and reverse displacement housings 15, the discharge pipe 16, and the oil pump 17. It is composed.

The scroll compressor configured as described above rotates the drive shaft 5 while the rotor 4 rotates inside the stator 3 by an applied power source, and the drive shaft 5 eccentrically rotates the turning scroll 6. As long as the eccentric rotation.

At this time, the turning scroll 6 is rotated at a distance separated by the turning radius from the axis of origin by the old dam ring 8.

As a result of the swinging movement of the swinging scroll 6, a compression chamber is formed between the swinging scroll 6 and each wrap 9a of the fixed scroll 9, and the compression chamber is moved to the center by the continuous swinging movement. The volume is reduced, the pressure is increased to be discharged through the discharge port 13, and the discharged gas passes through the discharge pipe 16 through the discharge chamber 18 and is then sent to the air conditioning system.

In addition, the oil sucked by the oil pump 17 is raised to the compression mechanism along the oil supply passage 5b, and a part of the raised oil flows into the journal bearing oil groove (not shown) to form a right angle of the upper frame 7. The oil is introduced into the oil groove (not shown) through the oil supply passage (not shown), and the oil penetrates into the sliding parts of the upper frame 7 and the turning scroll 6 to lubricate, and the remaining oil is driven by the driving pin. (5a) It is lubricated by penetrating into the inner and outer sliding parts of the boss 10, which is scattered from the top and swinging.

Some of the oil lubricated in each of the sliding parts flows down to the lower side of the compressor, and part of the oil is mixed with the refrigerant gas to the suction port (not shown) of the fixed scroll 9 by centrifugal force.

However, if the compressor is stopped after the normal operation, the low pressure suction side pressure and the high pressure discharge side pressure reach higher than the suction pressure and reach the equilibrium pressure lower than the discharge pressure, and restart the compressor when the equilibrium pressure is above a certain value. As a result, the compression torque generated by the compression process increases.

In addition, as shown in FIG. 2, if the compression torque is larger than the starting torque of the motor, starting fails and there is a problem that causes loss of motor in terms of reliability.

Accordingly, the present invention, in the fixed scroll plate to form a discharge hole to reduce the starting load by communicating the gas in the compression process at the start of the compressor with the discharge chamber, by providing a discharge valve to open and close the outlet of the discharge hole, operation stop In order to prevent starting failure caused by the compression torque generated during the compression process after restarting when the suction discharge pressure is higher than the constant equilibrium pressure, the gas during the compression process is discharged by starting the compression load. It is to reduce the.

1 is a longitudinal sectional view of a conventional scroll compressor.

Figure 2 is a motor torque pressure change diagram for the conventional and the load of the present invention.

Figure 3 is a block diagram of the starting load reducing device of the scroll compressor of the present invention.

4 is a pressure change diagram during the pressure process during startup of the starting load reducing device of the scroll compressor of the present invention.

5 is a bottom view of a starting load reducing device of the scroll compressor of the present invention.

6 is a bottom view of another embodiment of the starting load reducing device of the scroll compressor of the present invention;

*** Explanation of symbols for the main parts of the drawing ***

9: Fixed scroll 9a: Fixed scrap

13: Discharge outlet 18: Discharge room

19: discharge hole 20: discharge valve

As shown in FIGS. 2 to 6, the scroll load reducing device and the peripheral portion of the scroll compressor of the present invention have a fixed scroll (9) so as to communicate the gas during the compression process with the discharge chamber to reduce the starting load. The discharge hole 18 and the discharge valve 20 is installed to open and close the outlet of the discharge hole 18.

When the discharge hole 18 is one, the discharge hole 18 is formed on the circumference so as to have a compression load torque smaller than the motor starting torque, and at the center point of the distance between the fixed scroll wrap 9a and the wrap. Configure it to come.

In addition, when the discharge hole 18 is one or more, the position of each discharge hole 18 is configured on the circumference such that the compression load torque is smaller than the motor starting torque, and the position of each discharge hole 18 is involute. The phase difference on the curve is configured to be 360 °.

Looking at the starting load reducing device operating state of the scroll compressor of the present invention as shown in Figures 2 to 6,

First, as shown in FIG. 3, the fixed scroll 9 includes a discharge hole 18 communicating with the compression chamber and the discharge chamber during the compression process when the compressor is started. A discharge valve 20 is provided to enable it.

In this state, as shown in FIG. 4, when the compressor is started, the gas during the compression process is exposed to the discharge hole 18, and if the gas is larger than the suction discharge balance pressure, the discharge valve 20 is opened to open the gas during the compression process. Is discharged to the discharge shaft, and the discharge pressure is closed so that the discharge pressure is closed under the normal operating conditions in which the pressure is greater than the pressure of the gas during the extrusion process.

This actuating discharge hole 18 has a size smaller than the thickness of the scroll wraps 6a and 9a, and the position is installed at a position that can be operated even when the compressor is started and loaded, and the scroll wraps 6a and 9a between the wraps. The distance is installed at 1/2 point.

As shown in FIG. 6, when there are one or more discharge holes 18 formed in the fixed scroll 9, that is, when the discharge holes 18 are two, two compression chambers are compressed and discharged during the compression process. It starts to merge into one extrusion chamber.

Therefore, in order to reduce the loads generated in the two compression chambers, each discharge hole 18 is required, but when the discharge start position is the same, the discharge valve 20 and the fastening bolt are required twice, so that the same A discharge hole 18 is formed to be a load torque and configured to be openable and closed by one discharge valve 20.

The position difference of the discharge hole 18 is always configured so that the phase value is 360 ° on the involute curve.

By communicating the gas in the compression process with the discharge chamber at a certain position at the start of the compressor, the motor torque becomes smaller than the compression load torque at the start so that the starting failure does not occur, and the starting torque of the compressor motor such as the voltage fluctuation rate in the area used is reduced It starts without failing to start even under conditions, so that it is possible to start safely even under a wider starting and running condition.

Claims (2)

A discharge hole 18 for reducing the starting load by communicating gas with the discharge chamber during the compression process when the compressor is started on the hard plate of the fixed scroll 9 is formed between the wrap of the fixed scroll and the discharge hole in the fixed scroll. And a discharge valve for opening and closing the opening and closing of the scroll compressor (18). The method according to claim 1, wherein when the discharge holes 18 are one or more, the positions of the respective discharge holes 18 are configured on the circumference such that the compression load torque is smaller than the motor starting torque. A start-up load reduction device for a scroll compressor, wherein the position is configured such that the phase difference on the involute curve is 360 °.

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