KR100308308B1 - Safety of scroll compressor - Google Patents

Abstract

The present invention relates to a safety device of a scroll compressor, the present invention is an overload protection means mounted to the motor, and a rotating scroll and a fixed scroll to compress the gas while the rotary motion is received through the rotating shaft coupled to the motor coupled to the motor And a guide flow path for guiding heat generated from the fixed scroll and the swing scroll to the overload protection means during idling of the swing scroll, and the heat generated from the fixed scroll and the swing scroll being mounted on the guide flow path is greater than or equal to a predetermined temperature. In this case, the guide passage is opened so that the heat passes through the overload protection means, and when the temperature is lower than the set temperature, the guide passage is configured to include an opening and closing means to prevent the refrigerant gas from being compressed during the pump down operation or other operating conditions. If the heat generated when the temperature exceeds the set temperature, the system By stopping the operation of the fixed scroll and the turning scroll to prevent damage as well as to prevent the carbonization of oil.

Description

Safety device of scroll compressor {SAFETY OF SCROLL COMPRESSOR}

The present invention relates to a safety device of a scroll compressor, and in particular, the safety of the scroll compressor to prevent damage to the compressor by stopping the operation by detecting if the overheating occurs in the compression mechanism to compress the gas during idle operation of the compressor Relates to a device.

In general, an air conditioner or a refrigerator is provided with a refrigeration cycle device therein to keep the indoors in a pleasant state or to release food from the evaporator and condenser constituting the refrigeration cycle device by absorbing the heat from the outside. Will be kept fresh.

FIG. 1 illustrates a configuration of a separate type air conditioner in which an indoor unit and an outdoor unit are separated as an example of the air conditioner. As shown in the drawing, the outdoor unit A of the separate type air conditioner is provided in a casing having a predetermined shape. The compressor 100 and the condenser 200 generating noise and heat are mounted, and the indoor unit is equipped with an expansion means 300 and an evaporator 400 inside a casing having a predetermined shape, and the compressor 100 and the condenser 200. The expansion means 300 and the evaporator 400 are sequentially connected by the connecting pipe 500 to form a closed system, and the refrigerant is filled therein.

The separate type air conditioner is installed inside and outside the building in a state in which the indoor unit (B) and the outdoor unit (A) are separated in a building, and the connection pipe 500 is connected to form a closed system, and then operation is performed while circulating the refrigerant. On the other hand, when the air conditioner is installed in a building and separated to move to another building, the refrigerant is collected to the outdoor unit (A) by a pump down operation, and then the outdoor unit (A) and the indoor unit (B) are separated. The air conditioner is removed from the building.

On the other hand, a scroll compressor is applied as an example of a compressor mounted to the air conditioner, and as an example of the scroll compressor, as shown in Figure 2, the scroll compressor is the upper, lower inside, the lower side of the sealed container (1). Frames 2 and 3 are respectively coupled, and a stator 4 and a rotor 5 constituting a motor are mounted between the upper frame 2 and the lower frame 3.

Then, the rotating shaft 6 having the eccentric portion 6a formed therein is pressed into the rotor 5, and the fixed scroll 7 is fixedly coupled to the upper side of the upper frame 2, and the upper frame 2 and the fixed scroll are fixed. The turning scroll 8 is inserted between the seven. The fixed scroll 7 and the rotating scroll 8 are each formed of a wrap 7a, 8a protruding in an involute curve shape, so that the wrap 8a of the turning scroll 8 is fixed scroll 7 ) Is pivotally coupled to the wrap (7a). The lower portion of the turning scroll 8 is coupled to the eccentric portion 6a of the rotating shaft so that the rotational force of the rotating shaft 6 is transmitted, and the lower portion of the turning scroll 8 to prevent the rotation of the rotating scroll 8 to prevent the rotation The means 9 are coupled.

And a high and low pressure separator 10 for separating the inside of the sealed container 1 into a high pressure region and a low pressure region is coupled to the upper surface of the fixed scroll (7), the high temperature and high pressure refrigerant to the high low pressure separator 10 Gas flow control means 11 for controlling the flow of gas is coupled. A suction tube 12 into which the refrigerant gas is sucked into the hermetic container 1 located in the low pressure region side is coupled, and a discharge tube 13 through which the refrigerant gas in a high pressure state is discharged into the hermetic container 1 located in the high pressure region side. ) Is combined. And the oil is filled on the bottom surface of the sealed container (1) and the oil pump 14 is coupled to the end of the rotary shaft (6).

Operation of the scroll compressor, first, when the power is applied to the motor to operate as the rotor (5) constituting the rotation of the rotating force through the rotating shaft (6) is pressed into the rotor (5) It is transmitted to 8) and the swinging scroll 8 is pivoted while the rotation is prevented by the rotation preventing means (9). Refrigerant gas is sucked into the suction port (not shown) formed on one side of the fixed scroll 7 by the pivoting motion of the swing scroll 8 to the wraps 7a and 8a of the fixed scroll 7 and the swing scroll 8. It is introduced into a plurality of compression pockets (P) formed by the compression pocket (P) is moved to the center of the rotating scroll (8) and at the same time the volume gradually decreases by compressing the refrigerant gas discharge port (7b) of the fixed scroll It is discharged through. The refrigerant gas in the high temperature and high pressure state discharged to the discharge port 7b is discharged through the discharge tube 13.

The oil filled on the bottom surface of the sealed container 1 is pumped by the oil pump 14 as the rotary shaft 6 rotates, and sucked through the oil flow passage 6b formed on the rotary shaft 6 while the rotating scroll 8 and It is supplied to the part in which sliding contact, such as between the upper frames 3, is made.

On the other hand, when installing the separate air conditioner equipped with the scroll compressor in the building or remove the installed air conditioner in the pump down operation to collect the refrigerant to the outdoor unit (A) to connect the outdoor unit (A) and the indoor unit (B) After closing the connecting pipe 500, the compressor is operated to collect the refrigerant on the indoor unit B side to the outdoor unit A side.

However, when the pump down operation is performed for an excessive time during the pump down operation, the fixed scroll and the rotating scroll through which the refrigerant gas is compressed are overheated to damage the wrap of the fixed scroll and the rotating scroll, as well as the oil is carbonized to improve the oil performance. There was a problem that was degraded. On the other hand, the overload protector (OLP; Over-Load Portector) (16) is installed as an overload protection device to stop the system in the event of an overload, but it is only in response to the temperature around the motor is fixed If overheating occurs in the scroll 7 and the turning scroll 8, it will not work.

An object of the present invention devised in view of the problems described above is a scroll compressor that prevents damage to the compressor by stopping the operation by detecting when the overheating occurs in the compression mechanism for compressing the gas during idle operation of the compressor To provide safety devices.

1 is a schematic diagram showing a simplified form of a separate air conditioner,

2 is a longitudinal sectional view showing an example of a general scroll compressor;

3 is a cross-sectional view of the scroll compressor with a scroll compressor safety device of the present invention,

4 is a cross-sectional view showing an example of the scroll compressor safety device of the present invention;

Figures 5a, 5b is a plan view and a front sectional view of the opening and closing means constituting the scroll compressor safety device of the present invention.

(Explanation of symbols on the main parts of drawing

7; Fixed scroll 17; Overload Protection

20; Axis of rotation 20c; Second through-hole

30; Turning scroll 30e; First through-hole

40; Switching member 40a; Opening and closing member

40b; Switching member rib portion 40c; Opening and closing member support

F; Guide

In order to achieve the object of the present invention as described above, the overload protection means mounted to the motor, the rotating scroll and the fixed scroll to compress the gas while the rotary motion is received through the rotating shaft coupled to the motor, and the Guide flow path for guiding the heat generated from the fixed scroll and the swing scroll to the overload protection means during idling operation of the swing scroll, and the heat generated from the fixed scroll and the swing scroll when the heat generated in the fixed scroll and the swing scroll is above the set temperature A safety mechanism for a scroll compressor is provided, including an opening and closing means for opening the guide passage so that the heat passes through the overload protection means and blocking the guide passage when the heat flows below the set temperature.

Hereinafter, the safety device of the scroll compressor of the present invention will be described according to the embodiment shown in the accompanying drawings.

Figure 3 shows an example of a scroll compressor is provided with an example of the safety device of the present invention, Figure 4 is shown with a focus on the safety device of the present invention, when described with reference to this, first scroll compressor in the prior art As described above, the upper and lower frames 2 and 3 are respectively coupled to the inside of the hermetic container 1, and the stator 4 constituting the motor between the upper frame 2 and the lower frame 3. And a rotor 5, and an overload protection means 17 is mounted on the stator 4. It is preferable that an overload protector is used as the overload protection means 17. In addition, the rotating shaft 20 in which the eccentric portion 20a is formed in the rotor 5 is press-fitted, and the fixed scroll 7 is fixedly coupled to the upper side of the upper frame 2 at a predetermined interval and the upper frame 2 The rotating scroll 30 is inserted between the fixed scroll 7 and the fixed scroll 7 so that the fixed scroll 7 and the rotating movement are possible. The eccentric portion 20a of the rotating shaft 20 is inserted into the boss portion 30c protruding from the lower surface of the turning plate 30b of the turning scroll 30 to transmit the driving force transmitted to the rotating shaft 20 to the turning scroll 30. Rotation prevention means (9) for preventing the rotation of the swinging scroll 30 is coupled to the lower portion of the swinging scroll (30).

And the guide flow path (F) for guiding the heat generated from the fixed scroll (7) and the swing scroll (30) to the over-protection means 17 when the swing scroll (30) is not idle compression of the refrigerant gas is formed When the heat generated from the fixed scroll (7) and the revolving scroll (30) is above the set temperature, the guide flow path (F) is opened so that the heat passes through the overload protection means (17). When the temperature is set below the opening and closing means 40 for blocking the guide passage (F) is installed.

The guide passage F has a first through hole 30e formed at a central portion of the turning scroll 30 and a rotation shaft 20 for transmitting a driving force of the motor to the turning scroll 30. It consists of the 2nd through hole 20c formed so that 30e and the overload protection means 17 may communicate. The first through hole 30e is formed in the hard plate 30b of the revolving scroll 30, and the second through hole 20c is formed in a vertical hole a and a vertical hole formed in a direction perpendicular to the rotation shaft 20. Following the a) is formed into a horizontal hole (b) formed in the horizontal direction, the vertical hole (a) is formed at the end of the rotating shaft 20 and the horizontal hole (b) is formed to be located on the side of the over-protection means 17 do. The eccentric portion 20a of the rotation shaft 20 is inserted into the shaft insertion groove 30d formed in the boss portion 30c of the turning scroll 30, and the first through hole 30e is formed with the shaft insertion groove 30d. At the same time, it communicates with the second through hole 20c formed in the rotation shaft eccentric portion 20a inserted into the shaft insertion groove 30d.

As shown in FIGS. 5A and 5B, the opening / closing means includes a opening portion 40a which is formed in a predetermined area and blocks the guide flow path F and a plurality of rib portions radially extending to the opening / closing portion 40a. 40b) and the support part 40c extending to the rib part 40b concentrically with the opening / closing part 40a, wherein the opening part 40a, the rib part 40b and the support part 40c are entirely spherical. It consists of a thermal disk (Thermal Disk) formed by. The wool disc is inserted into the shaft insertion groove 30d of the boss portion 30c so as to be located between the end of the rotating shaft 20 and the lower surface of the turning scroll hard plate 30b, and the opening and closing portion 40a of the rotating disk 20b is rotated. The support part 40c is inserted so that the support part 40c may be located in the edge part of the rotating shaft 20 at the same time as blocking the 1st through-hole 30e formed in the inside.

And a high and low pressure separator 10 for separating the inside of the sealed container 1 into a high pressure region and a low pressure region is coupled to the upper surface of the fixed scroll (7), the high temperature and high pressure refrigerant to the high low pressure separator 10 Gas flow control means 11 for controlling the flow of gas is coupled. A suction tube 12 into which the refrigerant gas is sucked into the hermetic container 1 located in the low pressure region side is coupled, and a discharge tube 13 through which the refrigerant gas in a high pressure state is discharged into the hermetic container 1 located in the high pressure region side. ) Is combined. And the oil is filled on the bottom surface of the sealed container (1) and the oil pump 14 is coupled to the end of the rotating shaft (20).

Reference numeral 30a denotes a lap of turning scroll, and 7a is a lap of fixed scroll.

Hereinafter, the operational effects of the scroll compressor safety device of the present invention will be described.

First, when power is applied and the rotor 5 constituting the motor rotates as the motor operates, the rotational force is transmitted to the turning scroll 30 through the rotating shaft 20 press-fitted to the rotor 5. The turning scroll 30 is pivoted while the rotation is prevented by the rotation preventing means 9. Refrigerant gas is sucked through a suction port (not shown) formed at one side of the fixed scroll 7 by the pivoting motion of the swing scroll 30, and is compressed between the fixed scroll 7 and the swing scroll 30 while the fixed scroll ( The refrigerant gas discharged through the discharge port 7b formed at 7 and discharged to the discharge port 7b is discharged through the discharge tube 13.

The oil is filled in the bottom surface of the sealed container 1 and the oil is pumped by the oil pump 14 as the rotating shaft 20 rotates and sucked up through the oil flow path 20b formed on the rotating shaft 20 while turning the scroll. It is supplied to a part where sliding contact is made, such as between 30 and the upper frame 2.

As such, the scroll compressor is operated in a state in which the fixed scroll 7 and the swing scroll 30 are compressed without gas, so that the opening and closing means 40 is the guide flow path F, that is, the turning scroll. The first through hole 30e formed in 30 is blocked, and normal gas compression is performed. In addition, the oil drawn up through the oil passage 20b of the rotating shaft 20 and scattered to the end portion of the rotating shaft 20 is supplied to a portion in which sliding is performed between the rib portions 40b of the diaphragm disk 40, which are opening and closing means. . When a large amount of oil is introduced, the first through hole 30e may serve as a bypass hole.

When the scroll compressor is idling during the pump down operation, when the fixed scroll 7 and the turning scroll 30, which are compressed with gas, are overheated and the temperature is increased, the heat is transferred to the opening and closing means 40. When the temperature exceeds the set temperature, the guide passage F is opened while the snow disc 40, which is an opening and closing means, is turned over. When the guide flow path F is opened, the heat generated between the fixed scroll 7 and the turning scroll 30 passes through the guide flow path F, that is, the first through hole 30e and the second through hole F. While flowing, it is transmitted to the overload protection means 17, and by its heat, the overload protection means 17 is operated to stop the system.

In the present invention, when the scroll compressor is normally operated, the opening and closing means 40 blocks the guide flow path F so that the compression of the gas is performed normally, and the fixed scroll 7 and the propagation scroll 30 in which the gas is compressed during idling operation. When the temperature increases, the opening / closing member opens the guide flow path F by the heat, and heat is transferred to the overload protection means 17 through the guide flow path F to stop the system, thereby stopping the fixed scroll 7 and the turning scroll. Not only to prevent breakage of the 30, but also to prevent carbonization of the oil.

As described above, the safety device of the scroll compressor according to the present invention is generated in the fixed scroll and the rotating scroll made of the gas compressor during idling operation in which the refrigerant gas is not compressed during the pump down operation of the compressor or other operating conditions By stopping the system by transferring the heat to the overload protection means not only to prevent the damage of the fixed scroll and the swing scroll, but also to prevent carbonization of the oil has the effect of increasing the safety and reliability of the compressor.

Claims (3)

Overload protection means mounted on the motor, the rotating scroll and the fixed scroll to compress the gas while the rotary motion is received through the rotating shaft coupled to the motor, and the fixed scroll and the rotating scroll during idle operation of the rotating scroll A guide flow path for guiding the generated heat to the overload protection means, and when the heat generated in the fixed scroll and the swing scroll reaches a predetermined temperature or more, the guide flow path is passed to the overload protection means. Safety device for a scroll compressor, characterized in that it comprises an opening and closing means for blocking the guiding flow path when the temperature is opened and set below. According to claim 1, The guide flow path is formed so as to communicate the first through hole and the overload protection means to the first through hole formed through the center of the swing scroll and the rotating shaft for transmitting the driving force of the motor to the swing scroll. Safety device for a scroll compressor, characterized in that the second through-hole. According to claim 1, wherein the opening and closing means is formed with a predetermined area to block the guide flow path and the rib portion formed to extend a plurality of radially to the opening and closing portion and the support portion extending to the rib portion concentric with the opening and closing portion And the opening and closing portion, the rib portion, and the support portion are made of a snow disk formed in a spherical shape in its entirety.