KR20090093455A - A scroll compressor of invertor - Google Patents

Abstract

An inverter type scroll compressor is provided to cool an inverter and compressor refrigerant at the same time and prevent overheat by the inverter. The inverter type scroll compressor comprises a housing, fixed scroll, rotary scroll, driving device, inhalation port (600), and discharging port (700). The driving device swivels the rotary scroll. The inhalation port and discharging port are formed at the housing. Inhaled refrigerant passes through between the inverter and fixed scroll and is discharged through the discharging port.

Description

Inverter type scroll compressor {A SCROLL COMPRESSOR OF INVERTOR}

The present invention relates to an inverter type scroll compressor, and more particularly, to an inverter type scroll compressor that can reduce the required power and greatly increase the efficiency by simultaneously cooling the inverter and the compressed refrigerant using the suction refrigerant.

Generally, a scroll compressor includes a fixed scroll having a helical scroll wrap and fixed regardless of the rotation of the drive shaft, and a turning scroll which is also formed with a spiral scroll wrap and pivoting in accordance with the rotation of the drive shaft. A device for compressing a refrigerant by turning the swing scroll with respect to the fixed scroll while the refrigerant is sucked into the compression chamber formed between the scroll and the swing scroll.

A typical example of such a conventional scroll compressor is disclosed in FIG. 1 (hereinafter referred to as 'prior art 1'), and the structure thereof will be described below.

As shown, the electric scroll compressor has a housing 10, a suction port 60 and a discharge port 70 formed in the housing 10, and a fixed scroll 81 accommodated in the housing 10 and engaged with each other. And the swinging scroll 82, the drive shaft 83, the motor 84, the tip of the drive shaft 83 and the swinging scroll 82, the swinging (orbiting) movement of the swinging scroll 82 sliding bush (sliding to induce bush , 85) , and rotation preventing means 86 for preventing the rotation of the swinging scroll 82, and the like.

The suction port 60 and the suction chamber 13 are formed on the rear side of the housing 10, and the discharge port 70 and the discharge chamber 73 are formed on the front side.

In addition, the inverter 20 is sealed to the side of the main housing 10.

Meanwhile, the refrigerant passing through the suction chamber 13, the suction port 16, and the space 17 below the inverter 20 passes through the communication path 15 to the compression chamber (the space between the fixed scroll and the turning scroll) 88. Passed through the discharge port 811 formed in the fixed scroll 81 through the discharge chamber 73 and the discharge port 70 toward the condenser.

However, according to the scroll compressor of the prior art 1, since the suction refrigerant cools the inverter 20 and flows directly into the compression chamber 88, the compression refrigerant in the compression chamber 88 is heated.

Accordingly, there is a disadvantage in that the efficiency of the compressor is lowered and the required power is increased. In other words, due to the temperature rise occurring during the compression process, the isentropic efficiency is lowered, leading to an increase in power required.

In addition, since the suction gas is adjacent to the discharge chamber 73, a decrease in efficiency due to heating has occurred.

In addition, according to the compressor of the prior art 1, when the degree of superheat is lowered to increase the heat exchange efficiency of the evaporator (not shown), which is a preliminary component, the suction refrigerant, which does not leave the liquid region, is compressed to enter a wet compressing state. There was also a risk of damage to the compressor.

The present invention has been made to solve the above problems, an object of the present invention is to provide an inverter scroll compressor that can prevent overheating of the compressor and significantly increase the efficiency of the compressor by simultaneously cooling the inverter and the compressed refrigerant using the suction refrigerant. To provide.

In addition, an object of the present invention is to provide an inverter-type scroll compressor that can reduce the power required as the efficiency of the compressor increases.

In addition, to provide an inverter-type scroll compressor that can increase the heat exchange efficiency of the evaporator to reduce the superheat degree at the time of the first suction of the refrigerant.

In order to achieve the above object, the inverter-type scroll compressor according to the present invention,

housing,

A fixed scroll fixed to the housing and a rotating scroll pivoting with respect to the fixed scroll;

Driving means for driving the swing scroll;

A suction port and a discharge port formed in the housing;

Including an inverter disposed to face the front of the fixed scroll,

The fixed scroll has a suction port penetrated to the compression chamber, and the discharge scroll is formed in the turning scroll, and the suction refrigerant flows between the inverter and the fixed scroll through the suction port and is discharged through the discharge port. .

In this case, a guide portion for guiding the suction refrigerant from the suction port to the suction port is formed on the front surface of the fixed scroll facing the inverter.

In addition, the guide portion is characterized in that the introduction port is formed in communication with the suction port of the fixed scroll.

In addition, when viewed from the direction of the drive shaft, the guide portion is characterized in that a plurality of guide channels are formed extending in the circumferential direction.

In addition, at least one of the guide channels is characterized in that one end is disposed in the vicinity of the suction port and the other end is arranged in the inlet.

In addition, at least a portion of the guide channel is characterized in that it has an arc shape.

In addition, at least one of the guide channels is characterized in that it has a straight inlet on the suction port side.

In addition, the guide channel is characterized by being formed by a plurality of guide strips or guide grooves.

In addition, the drive shaft is characterized in that the discharge passage is formed through the longitudinal direction.

In addition, at least a portion of the discharge passage formed in the drive shaft is characterized in that formed inclined outward from the center of rotation from the rear toward the front.

In addition, the discharge port is characterized in that formed behind the swinging scroll.

According to the present invention having the above-described configuration, by simultaneously cooling the inverter and the compressed refrigerant using the suction refrigerant, it is possible to prevent overheating of the compressor by the inverter and to significantly increase the compressor efficiency.

In addition, due to the increase in the efficiency of the compressor it is possible to greatly reduce the power required to compress to a predetermined pressure.

In addition, it is possible to lower the superheat degree at the first suction of the refrigerant to increase the heat exchange efficiency of the evaporator.

In addition, since the suction gas is far from the discharge chamber, the suction gas is not heated by the discharge chamber, thereby preventing a decrease in compression efficiency.

1 is a vertical cross-sectional view showing the configuration of an inverter compressor according to the prior art 1.

2 is a longitudinal cross-sectional view showing the configuration of an inverter-type compressor according to the present invention.

3 is a longitudinal sectional view showing the circulation structure of the suction refrigerant in the inverter-type compressor according to the present invention.

4 is an exploded perspective view showing the configuration of an inverter-type compressor according to the present invention.

5 is a front perspective view excluding the inverter of FIG. 2.

6 is a P-H diagram of the suction refrigerant passing through the inverter compressor according to the present invention.

7 is a P-H diagram of the suction refrigerant passing through the inverter compressor according to the prior art.

※ Explanation of Major Drawings

100 ... housing

200 .... Inverter

300, 500 ... inverter case

600 ... Suction port

700 ... discharge port

810 ... Fixed Scroll

820 ... Turning Scroll

830 ... axis of rotation

840 ... motor

850 ... Sliding Bush

860 ... Anti-rotation measures

900 ... guide

910 ... Inlet

920 ... guide channel

921 ... straight inlet

922 ... arc guide

1000 ... inverter compressor

2 to 5, a preferred embodiment of the present invention will be described in detail.

As shown, the inverter-type scroll compressor 1000 according to the present invention, the housing 100, the suction port 600 and the discharge port 700 formed in the housing 100, and in the housing 100 The rotating scroll is provided between the fixed scroll 810 and the turning scroll 820, the driving shaft 830, the motor 840, the tip of the driving shaft 830 and the turning scroll 820 to be received and engaged with each other. Sliding bush 850 for inducing a swing (orbit) movement of the 820, and a rotation preventing means 860, such as the old dam ring for preventing the rotation of the swing scroll 820. The drive shaft 830, the drive motor 840, the sliding bush 850, and the anti-rotation means 860 constitute a turning drive means of the turning scroll 820.

2 To  From 4, above The housing 100 is  Front inverter housing 110, rear main housing 130, and the inverter Housing 110 and  main housing The main frame 120 is disposed between the 130. However, the above Of housing 100  As the configuration, various known examples can be adopted.

In the housing 100, a suction port 600 and a discharge port 700 are formed, respectively, to suck refrigerant from the evaporator through the suction port 600, and between the fixed scroll 810 and the turning scroll 820. After the refrigerant is compressed in the compression chamber 880, the refrigerant is sent to the condenser through the discharge port 700.

In particular, according to the present invention, the inverter 200 is disposed on the front surface of the fixed scroll 810, and the suction port 815 is formed in the fixed scroll 810 so as to pass through the compression chamber 880. The suction port 815 is formed near the outer circumference of the fixed scroll 810 to have a structure in which the sucked refrigerant is discharged while being compressed toward the center from the outer circumference.

In addition, a guide portion 900 for guiding the suction refrigerant from the suction port 600 to the suction port 815 is formed on the front surface of the fixed scroll 810 facing the inverter 200.

Accordingly, the suction refrigerant flows between the inverter 200 and the guide unit 900 to simultaneously cool the inverter 200 and the compression chamber 880.

However, the guide unit 900 is omitted to allow the suction refrigerant to pass between the inverter 200 and the fixed scroll 810, and the refrigerant flows into the compression chamber 880 through the suction port 815 of the fixed scroll 810. It can also be inhaled.

The refrigerant passing through the compression chamber 880 passes through the discharge port 821 formed in the turning scroll 820 and is discharged through the discharge port 700.

In the figure, the suction refrigerant is discharged through the rear end of the housing 100 by forming the discharge passage 835 in the drive shaft 830 along its longitudinal direction, but does not necessarily pass through the inside of the drive shaft.

On the other hand, as shown, the guide portion 900 is preferably formed with an inlet 910 in communication with the inlet 815 of the fixed scroll (810). In this configuration, the sucked refrigerant is guided through the guide unit 900 and then flows into the compression chamber 880.

In addition, when viewed from the direction of the drive shaft, the guide unit 900 has a plurality of guide channels 920 are formed extending in the circumferential direction. In this case, one or more of the guide channel 920, one end thereof is disposed near the suction port 600 and the other end is disposed near the inlet 910.

Accordingly, the refrigerant is guided from the suction port 600 to the inlet 910 to uniformly cool the inverter 200 and the compression chamber 880.

In particular, when the suction port 600 is formed on the side of the housing 100, a part of the guide channel 920 has a linear inlet 921 on the suction port 600 side and the remaining section is an arc-shaped guide 922 ), Uniform cooling of the compression chamber 880 is possible. That is, during suction, the liquid is rapidly introduced through the linear inlet 921 and uniformly cools the entire surface of the compression chamber 880 through the arc-shaped guide 922. After the cooling is completed, the suction refrigerant flows into the compression chamber 880 through the inlet 910 and the suction port 815.

As shown, according to the present invention, since the discharge port 700 is located behind the swing scroll 820, the suction refrigerant is substantially separated from the discharge portion. Accordingly, the suction refrigerant can exhibit an intact cooling effect without being thermally affected by the discharge portion.

As shown, the guide channel 920 is formed by a plurality of guide strips 923 but may be formed by guide grooves.

On the other hand, at least a portion of the discharge passage 835 formed in the drive shaft 830 is preferably formed to be inclined outward from the center of rotation from the rear toward the front. In this configuration, the refrigerant, which partially contains oil while passing through the compression chamber 880, is separated by gas-liquid separation by centrifugal force when passing through the discharge passage 835. In this case, the separated oil may be flowed back on the discharge passage 835 and supplied to the main bearing 870.

Hereinafter, the circulation and cooling of the suction refrigerant in the inverter-type scroll compressor of the present invention will be described with reference to FIGS. 2 and 3.

First, suction refrigerant flows in through a suction port 600 formed in the housing 100 from an evaporator (not shown).

At this time, the refrigerant is kept at a very low temperature and contains some liquid.

The sucked refrigerant passes through the guide portion 900 between the inverter 200 and the fixed scroll 810 and simultaneously cools the inverter 200 and the compression chamber 880 and heats itself to maintain an appropriate degree of superheat.

The suction refrigerant passing through the guide unit 900 enters the compression chamber 880 through the inlet 910 of the guide unit 900 and the inlet 815 of the fixed scroll 810.

In the compression chamber 880, cooling is performed by a subsequent suction refrigerant during the compression process. Cooling during the compression process reduces the power required for compression up to a predetermined pressure.

The compressed refrigerant is discharged through the discharge port 700 through the discharge port 821 formed in the turning scroll 820.

In particular, in the drawing, the discharge passage 835 is formed through the drive shaft 830 along its longitudinal direction so that the refrigerant passing through the discharge port 821 passes through the rear end of the housing 100 and the drive motor and the housing 100. It is discharged to the discharge port 700 through the passage formed between.

To this end, the rear end of the housing 100 may be formed with a groove 170 extending in the radial direction for the passage of the refrigerant.

Undescribed components 710 and 720 Gasket  Indicates.

6 shows a P-H (pressure-enthalpy) graph showing a cooling cycle including the inverter scroll compressor according to the present invention. Hereinafter, the cooling cycle will be described with reference to the accompanying graph.

In the graph, A-B-C-D-E-F represents the process of circulating the refrigerant, A-D corresponds to the compressor, D-E is the condenser, E-F is the expansion valve, F-A corresponds to the section in the evaporator.

As shown, according to the present invention, the suction refrigerant at the compressor inlet A is in a state containing liquid. That is, the volume occupied by the liquid in the evaporator increases, so that the heat exchange efficiency increases.

In the graph, section A → B represents the state where the temperature rises by cooling the inverter 200 by itself, and section B → C shows the state where the temperature rises while cooling the refrigerant compressed in the compression chamber 880. As a result of the two cooling actions, the suction refrigerant is not only completely gaseous but also has an appropriate degree of superheat.

Next, the C → D section is a process in which the actually sucked refrigerant is compressed. However, since the cooling of the refrigerant under compression is performed by the suction refrigerant during the compression process, a predetermined pressure is reached at a steep slope. In other words, the predetermined compression is completed with a small power requirement.

The dotted line in the graph represents the theoretical relationship as an isentropic process.

As shown, according to the present invention, the isentropic efficiency defined as the power of the isentropic process (PAs) relative to the power (work) of the actual process (PAr) exceeds 100%.

For reference, FIG. 7 illustrates a cooling cycle including a compressor in which a conventional suction refrigerant cools only an inverter.

As shown, since the inverter is cooled through A '→ B' and is heated by itself and directly enters the compression chamber, power required to obtain a predetermined pressure is greatly increased. That is, since there is no cooling action of the refrigerant under compression by the suction refrigerant in the compression chamber, the efficiency of the compressor is greatly reduced compared to the present invention.

The dotted line in the graph is an isotropic process, and the isentropic efficiency cannot exceed 100%.

Claims (11)

housing, A fixed scroll fixed to the housing and a rotating scroll pivoting with respect to the fixed scroll; Driving means for driving the swing scroll; A suction port and a discharge port formed in the housing; Including an inverter disposed to face the front of the fixed scroll, The fixed scroll has a suction port penetrated to the compression chamber, and the discharge scroll is formed in the turning scroll, the suction refrigerant flows between the inverter and the fixed scroll through the suction port and is discharged through the discharge port. Inverter type scroll compressor. The method of claim 1, And a guide portion for guiding suction refrigerant from the suction port to the suction port on a front surface of the fixed scroll facing the inverter. The method of claim 2, Inverter-type scroll compressor characterized in that the guide portion is formed in communication with the suction port of the fixed scroll. The method of claim 3, When viewed from the direction of the drive shaft, the inverter unit scroll compressor, characterized in that a plurality of guide channels are formed extending in the circumferential direction. The method of claim 4, wherein At least one of the guide channels, one end of which is disposed near the suction port and the other end of which is disposed in the inlet. The method of claim 5, Inverter-type scroll compressor, characterized in that at least a portion of the guide channel has an arc shape. The method of claim 5, At least one of the guide channels has a straight inlet on the suction port side. The method according to any one of claims 4 to 7, And the guide channel is formed by a plurality of guide strips or by guide grooves. The method according to any one of claims 1 to 7, And the discharge port is formed behind the swing scroll. The method according to any one of claims 1 to 7, Inverter-type scroll compressor, characterized in that the discharge shaft is formed through the drive shaft along the longitudinal direction. The method of claim 10, At least a portion of the discharge passage formed in the drive shaft is inverted scroll compressor, characterized in that formed inclined outward from the center of rotation from the rear toward the front.