KR100417582B1 - Vacuum preclusion apparatus for scroll compressor - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum compressor of a scroll compressor, comprising: a casing for forming an accommodating space therein, a fixed scroll fixedly disposed in the casing with an involute-shaped fixed blade, and an involute formed corresponding to the fixed blade. A swing scroll having a swing wheel having a shape and relatively movable to the fixed scroll, and a high and low pressure that is disposed above the fixed scroll along a vertical direction of the casing to divide the inner space of the casing into a high pressure side and a low pressure side; A scroll compressor having a separator, comprising: pressure sensing means for sensing a pressure of a refrigerant compressed by the interaction of the fixed scroll and the swing scroll; Temperature sensing means for sensing the internal temperature of the high pressure side; A communication hole formed through the high and low pressure separation plate so as to communicate with the high pressure side and the low pressure side; Opening and closing means coupled to the high and low pressure separation plate to open and close the communication hole; And a control unit for controlling the opening and closing means based on the detection result of the pressure sensing means and the temperature sensing means. As a result, when any one of the internal temperature and the pressure exceeds the limit value due to the vacuum, the refrigerant in the high pressure region flows to the low pressure region, so that abnormal wear and compression loss of the component can be suppressed. A vacuum preventing device of the compressor is provided.

Description

Vacuum Compressor of Scroll Compressor {VACUUM PRECLUSION APPARATUS FOR SCROLL COMPRESSOR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum compressor of a scroll compressor, and more particularly, by allowing a refrigerant in a high pressure region to flow into a low pressure region when any one of an internal temperature and a pressure exceeds a threshold due to a vacuum. The present invention relates to a vacuum compressor of a scroll compressor for suppressing occurrence of abnormal wear and compression loss of a component.

The scroll compressor has a casing for forming a receiving space enclosed therein, a fixed scroll fixedly disposed inside the casing with an involute-shaped fixed blade, and an involute-shaped swing blade formed corresponding to the fixed scroll. It is provided with a rotating scroll coupled to the relative movement relative to the, and an electric motor for providing a driving force to the rotating scroll.

When the scroll compressor is operated in a state where refrigerant is not sucked, such as when the service valve is closed, there is a problem in that the internal temperature rises and abnormal wear of the fixed scroll and the rotating scroll proceeds to shorten the service life.

In consideration of such a problem, there are vacuum preventing devices that can prevent the operation in the vacuum state by allowing the refrigerant on the high pressure side to flow to the low pressure side during the vacuum generation.

1 is a state diagram used in the vacuum preventing device of the conventional scroll compressor. As shown, the fixed scroll 17 and the turning scroll 25 are mutually coupled to the inner upper region of the casing 11 so as to suck / compress the refrigerant, and one side of the casing 11 sucks the refrigerant. The suction pipe 13 and the discharge pipe 15 through which the compressed refrigerant is discharged are respectively coupled.

On the upper side of the fixed scroll 17, a high and low pressure separation plate 23 is installed so as to separate / compart the inner space of the casing 11 into the high pressure side and the low pressure side.

On the other hand, the fixed scroll 17 is formed with a flow path (19) of the refrigerant so as to communicate with the high pressure side and the low pressure side where the compressed refrigerant is temporarily accommodated, the refrigerant is not sucked to the high pressure side of the flow path (19) When the internal temperature is higher than the first temperature, which is an abnormal temperature, the flow path 19 is opened, and when the internal temperature drops below the second temperature, which is a temperature at which the internal temperature drops to a normal state by supplying a refrigerant. An opening / closing member 21 called a so-called thermo disc that blocks the flow passage 19 is provided.

The opening and closing member 21 has a “V” cross-sectional shape, and a plurality of through holes 22 are formed to penetrate the plate surface and allow the refrigerant to pass therethrough. The opening / closing member 21 is reversed to the reverse “V” shape above the first temperature to open the flow path 19, and when the first temperature is lower than the first temperature, the opening / closing member 21 is reduced to the “V” cross-sectional shape to block the flow path 19. do.

By this configuration, when the temperature is raised above the first temperature because the refrigerant is not sucked, the opening and closing member 21 is reversed to the reverse "V" cross-sectional shape to open the flow path 19 to cool the refrigerant on the high pressure side. By allowing the flow to the low pressure side, the turning scroll 25 is prevented from continuously turning in the vacuum state.

By the way, in the conventional vacuum compressor of the scroll compressor, the flow path 19 is opened and closed by the opening / closing member 21 whose shape changes with temperature change, and the vacuum state is removed, and the internal temperature is 1st. Until the temperature is reached, the turning scroll 25 continues to operate in a substantially vacuum state, causing abnormal wear and shortening the life.

2 is a view showing another example of a vacuum preventing device of a conventional scroll compressor. The same reference numerals are used to designate the same or equivalent components as those described above, and a detailed description thereof will be omitted. As shown, one side of the fixed scroll 17 is formed with a piston accommodating portion 31 which is open to the low pressure side, and the lower one side of the piston accommodating portion 31 is substantially mutually with the intermediate point of the compression space along the radial direction. The first communication hole 33 is formed to be able to communicate. The piston 37 is slidably accommodated in the piston accommodating part 31, and a spring member 39 is provided at one side of the piston 37 to elastically pressurize the piston 37 to the center area. .

A second communication hole 35 is formed in the upper central region of the piston accommodating part 31 so that the piston 37 can be communicated with the high pressure side when the piston 37 is moved to the center side of the fixed scroll 17.

By this configuration, when the refrigerant is sucked into the compression space and the compression proceeds, the piston 37 slides in the direction in which the spring member 39 is compressed to block the second communication hole 35. The refrigerant flows to the high pressure side and is discharged to the outside of the casing 11 through the discharge pipe 15.

When the refrigerant is not sucked into the compression space, the piston 37 slides toward the first communication hole 33 by the elastic force of the spring member 39 so that the second communication hole 35 is opened. Accordingly, the refrigerant on the high pressure side flows to the low pressure side and is sucked back into the compression space, thereby preventing the turning scroll 25 from continuously operating in a vacuum state.

By the way, in the conventional vacuum compressor of the scroll compressor, the pressure in the compression space and the elastic force of the spring member 39 are balanced to block the second communication hole 35, so that even a slight pressure change is prevented. Since the second communication hole 35 is opened and the refrigerant on the high pressure side flows to the low pressure side, there is a problem that a compression loss occurs.

Accordingly, it is an object of the present invention to cause abnormal wear and compression loss of components by causing the refrigerant in the high pressure region to flow to the low pressure region when any one of the internal temperature and pressure is exceeded due to the vacuum. It is to provide a vacuum preventing device of a scroll compressor that can be suppressed.

1 is a state of use of the vacuum preventing device of the conventional scroll compressor,

2 is a view showing another example of a vacuum preventing device of a conventional scroll compressor;

3 is a longitudinal sectional view showing a state of use of the vacuum preventing device of the scroll compressor according to an embodiment of the present invention;

4 is a control block diagram of a vacuum preventing device of the scroll compressor of FIG.

5 and 6 are diagrams showing an operating state, respectively.

Explanation of symbols on the main parts of the drawings

11: casing 17: fixed scroll

18: fixed wing 25: turning scroll

26: rotor blade 41: temperature detection sensor

43: pressure detection sensor 45: control unit

47: on-off valve 49: solenoid

55: communication hole

According to the present invention, there is provided a casing for forming a receiving space therein, a fixed scroll having an involute-shaped fixed blade disposed inside the casing, and an involute-shaped swing blade formed corresponding to the fixed blade. It has a rotating scroll coupled to the fixed scroll so as to be relatively movable, and a high and low pressure separation plate is disposed on the upper side of the fixed scroll in the vertical direction of the casing to partition the inner space of the casing into a high pressure side and a low pressure side A scroll compressor comprising: pressure sensing means for sensing a pressure of a refrigerant compressed by an interaction between the fixed scroll and the swing scroll; Temperature sensing means for sensing the internal temperature of the high pressure side; A communication hole formed through the high and low pressure separation plate so as to communicate with the high pressure side and the low pressure side; Opening and closing means coupled to the high and low pressure separation plate to open and close the communication hole; It is achieved by the vacuum compressor of the scroll compressor, characterized in that it comprises a control unit for controlling the opening and closing means based on the detection result of the pressure sensing means and the temperature sensing means.

Here, the opening and closing means preferably includes an on-off valve arranged to block the communication hole, and a solenoid for driving the on-off valve.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the present invention.

3 is a longitudinal sectional view showing a state of use of the vacuum compressor of the scroll compressor according to an embodiment of the present invention, Figure 4 is a control block diagram of the vacuum compressor of the scroll compressor of Figure 3, Figures 5 and 6 Are diagrams showing the operating states, respectively. The same and equivalent parts as those described above and shown in the drawings will be described with the same reference numerals. As shown in these figures, the scroll compressor has a casing 11 for forming a closed space therein and a fixed scroll 17 fixedly disposed in the casing 11 with an involute-shaped fixed blade 18. And, having a swing blade (26) formed to correspond to the fixed blade (18) has a swing scroll (25) coupled to be relative to the fixed scroll (17).

One side of the casing 11 is provided with a suction pipe 13 for sucking the refrigerant, and the discharge pipe 15 is provided on the upper side of the suction pipe 13 so that the compressed refrigerant can be discharged.

On the upper side of the fixed scroll 17, a high and low pressure separation plate 23 for separating the internal space into a high pressure side and a low pressure side is installed, and the high and low pressure separation plate 23 communicates so that the high pressure side and the low pressure side can communicate with each other. The ball 55 is formed.

On the other hand, the vacuum compressor of the present scroll compressor includes a temperature detection sensor 41 for detecting the internal temperature of the high pressure side, and a pressure detection for detecting the pressure of the refrigerant compressed by the fixed scroll 17 and the swing scroll 25. Opening and closing valve 47 for opening and closing the sensor 43, the communication hole 55 formed in the high and low pressure separating plate 23, solenoid 49 for driving the opening and closing valve 47, pressure detection sensor 43 And a control unit 45 for controlling the solenoid 49 based on the detection result of the temperature detection sensor 41.

In the upper central region of the fixed scroll 17, a temperature detection sensor 41 is provided to detect the internal temperature. One side of the fixed scroll 17 is formed with a piston accommodating part 31 opened to the low pressure side, and one side of the piston accommodating part 31 is formed with a through hole in communication with the compression space.

The piston 37 is slidably accommodated in the piston accommodating part 31, and one side of the piston 37 is provided with a spring member 39 to elastically pressurize the piston 37. Inside the piston accommodating part 31, a pressure detection sensor 43 for detecting the pressure of the compression space by measuring the displacement of the piston 37 is provided.

On the other hand, the high and low pressure separating plate 23 is provided with an opening and closing valve 47 so as to be movable along the vertical direction to open and close the communication hole 55, the opening and closing valve 47 on the opposite side of the opening and closing valve 47. The solenoid 49 which drives up and down is provided.

The solenoid 49 has a bobbin 52 having a cylindrical shape, one end of which is slidably movable along the axis of the bobbin 52, and the other end of the solenoid 49 passes through the communication hole 55 to be integral with the on-off valve 47. It comprises a magnetic rod 51 to be connected and a coil 53 wound around the bobbin 52 to generate a magnetic force. The inside of the bobbin 52 has a rod spring 54 for elastically pressing the magnetic rod 51 so that the on-off valve 47 blocks the communication hole 55.

By such a configuration, when power is applied to the electric motor unit (not shown), the swinging scroll 25 pivots about the fixed scroll 17 about the rotational axis of the electric motor unit, thereby causing the space between the fixed blade 18 and the swinging blade 26. The refrigerant in is compressed as it moves to the central area. The compressed refrigerant is temporarily accommodated on the high pressure side and discharged to the outside of the casing 11 through the discharge pipe 15, and the refrigerant is sucked through the suction pipe 13 inside the casing 11.

On the other hand, when power is applied to the electric motor unit and the turning scroll 25 starts to rotate, the temperature detection sensor 41 and the pressure detection sensor 43 detect the internal temperature on the high pressure side and the pressure in the compression space, respectively. do. At this time, the control unit 45, based on the detection results of the temperature detection sensor 41 and the pressure detection sensor 43, if any one of the detected temperature value and pressure value first exceeds the upper limit value or the lower limit value, the control unit ( 45 allows power to be applied to the coil 53 so that the communication hole 55 can be opened.

When power is applied to the coil 53, the magnetic rod 51 is moved in the direction in which the rod spring 54 is compressed, and the opening / closing valve 47 integrally connected to the end of the magnetic rod 51 has a communication hole 55. The communication hole 55 is opened apart from the opening.

Accordingly, the refrigerant on the high pressure side passes through the communication hole 55 and flows to the low pressure side through the through hole 56 formed in the upper region of the bobbin 52 and is sucked into the compression space, thereby turning the scroll scroll 25 in a vacuum state. ) Will keep running.

As described above, according to the present invention, the temperature detection sensor for detecting the internal temperature, the pressure detection sensor for detecting the pressure of the compression space, the communication hole for communicating the high pressure side and the low pressure side, and the opening and closing the communication hole A control unit for controlling the opening and closing means to open and close the communication hole based on the detection result of the temperature detection sensor and the pressure detection sensor, if any one of the detected temperature value and pressure value exceeds the limit value, By allowing the coolant to flow to the low pressure side, there is provided a vacuum compressor for a scroll compressor that can suppress occurrence of abnormal wear and compression loss of a component.

Claims (2)

A casing defining an accommodating space therein, a fixed scroll fixedly disposed in the casing with an involute-shaped fixed blade, and an involute-shaped swirling blade formed corresponding to the fixed blade so as to be able to move relative to the fixed scroll A scroll compressor having a swing scroll coupled to each other, and a high and low pressure separation plate disposed above the fixed scroll along a vertical direction of the casing to divide the casing into a high pressure side and a low pressure side. Pressure sensing means for sensing the pressure of the refrigerant compressed by the interaction of the swing scroll; Temperature sensing means for sensing the internal temperature of the high pressure side; A communication hole formed through the high and low pressure separation plate so as to communicate with the high pressure side and the low pressure side; Opening and closing means coupled to the high and low pressure separation plate to open and close the communication hole; And a control unit for controlling the opening and closing means based on the detection result of the pressure sensing means and the temperature sensing means. The method of claim 1, The opening and closing means is a vacuum compressor of the scroll compressor, characterized in that it comprises an on-off valve arranged to block the communication hole, and a solenoid for driving the on-off valve.