KR100286714B1 - The Rotary Compressor with the System of Suction through Bearing - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor having a suction structure in a bearing portion, and in particular, comprising a rotor and a stator which are electric elements in a sealed container, wherein the rotor is shrinked and eccentrically rotates in the cylinder with the rotation of the rotor. The roller which is rotated by rotating the shaft and the rotating shaft, the vane which is squeezed by the vanes spring and back pressure on the outer circumference of the roller and performs linear reciprocating motion, and the refrigerant gas introduced into the cylinder has the vane at the top dead center position. In a rotary compressor having a discharge port and a discharge valve for discharging high-temperature and high-pressure refrigerant gas by braille compression by a rotational movement of a crank shaft and a roller by starting a suction stroke, the upper bearing, the lower bearing, or the upper and lower bearings. By forming an intake port through which the refrigerant gas is sucked in, the refrigerant gas flows out when re-expansion occurs in the cylinder. To prevent the volumetric efficiency decreases, and prevent power loss generated during the initial compression.

Description

Rotary compressor with suction structure in bearing part {The Rotary Compressor with the System of Suction through Bearing}

The present invention relates to a rotary compressor having a suction structure in a bearing. In particular, in the conventional rotary compressor, the refrigerant is sucked and compressed through the side of the cylinder, and the refrigerant is sucked through the upper and lower bearings mounted on the lower (or upper) cylinder. By doing so, the re-expansion phenomenon occurring after the end of compression in the cylinder and thereby the volume efficiency reduction are prevented.

Looking at the general conventional rotary compressor structure as shown in Figures 1 and 2,

First, as shown in FIG. 1, it is comprised by the compression mechanism part in the sealed container 1, the electric drive part which drives it, and the oil supply part which supplies oil by the drive of the said electric drive part.

The power mechanism is a stator (2) is a magnetic force is generated when the power is applied, a rotor (3) to rotate by the magnetic force of the stator, and a crank shaft (4) installed and rotated on the rotor (3) It consists of.

As shown in (a) of FIG. 2, the compression mechanism portion is located below the electric mechanism portion, and includes a cylinder 7 for sucking and discharging refrigerant gas into the suction port 12 and the discharge port 13, and the cylinder 7 A cylinder slot 11 formed at the upper side, an upper bearing 5 and a lower bearing 6 which are assembled to the upper and lower portions of the cylinder 7 to support the crankshaft 4, and the lower end of the crankshaft 4; An eccentric ring 16 fixedly mounted on the eccentric wheel 16 and fixed to the eccentric wheel 16, and a roller 8 which rotates and revolves along the inner circumferential surface of the cylinder 7, And a compression chamber 15 on the high pressure side and a suction chamber 14 on the low pressure side, which are installed in the cylinder 7 and formed along the outer circumferential surface of the roller 8 that rotates and rotates by the vane spring 10. It consists of vanes 9 to distinguish.

The vane 9 is in close contact with the roller 8 by the force of the vane spring 10 and the back pressure and the self inertia force of the vane rear surface to move up and down in the cylinder slot 11 according to the movement of the shaft.

When the eccentric portion of the shaft is eccentric with respect to the axial center to perform the process movement, the suction chamber 14 formed by the vanes 9 and the rollers 8 increases in volume to suck in fresh refrigerant from the suction port 12. The compression chamber 15 reduces the volume and compresses the refrigerant.

When the axial rotation angle reaches 210 °, the pressure in the compression chamber 15 becomes larger than the pressure of the discharge gas outside the cylinder 7 to discharge the refrigerant gas to the outside through the discharge port 13.

When the shaft rotates to the vicinity of the discharge port 13, the discharge process of the refrigerant gas is completed, the discharge valve (not shown) installed in the bearing is closed.

At this time, as shown in Fig. 2B, the compressed refrigerant gas remaining in the flow path formed to discharge the refrigerant gas from the discharge port 13 to the valve is re-expanded to the suction chamber 14 side. do.

When the high-pressure compressed gas remaining in the discharge measurement is reswelled, high temperature heat and pressure are transmitted to the suction chamber 14 side, and when the re-expansion occurs, the suction gas may flow back to the suction port 12 side, and the suction gas is suction port 12 It is also possible not to enter the suction chamber (14) through.

In the re-expansion phenomenon of the compression start remaining in the discharge measurement as described above, the back flow of the suction gas and the re-expanded gas to the suction port 12 occurs, so that the suction gas is sufficiently inflated during the re-expansion period. It does not flow into (14).

This phenomenon means that the total volume of the compressor cylinder 7 cannot be utilized for inlet of the refrigerant gas, resulting in a reduction in the volumetric efficiency of the compressor.

That is, the loss of the refrigerant mass flow rate of the suction gas that cannot be introduced during the re-expansion period, there was a problem that the efficiency of the compressor brings a decrease.

In addition, in the conventional structure, since the inlet 12 is formed inside the cylinder 7 from the outside in the radial direction, when the inlet 12 having an appropriate area is processed, the inlet 12 has a machining position in which the top dead center and the cylinder are cut. Α ° with respect to the center, and the maximum angle at which the inlet 12 is placed becomes β °.

Usually, the maximum angle at which the inlet 12 is placed is 35 to 45 °, and the compression process does not occur because the refrigerant is allowed to flow in and out through the inlet 12 even though the shaft rotates during this interval.

Therefore, the compressor does zero work by β °.

However, there is a problem that the shaft is zero, but the loss occurs because friction occurs in the compression mechanism such as vanes / rollers, shaft / bearing during the interval.

The present invention has been invented in view of such a conventional problem, and by forming an intake port through which refrigerant gas is sucked into the upper bearing, the lower bearing, or the upper and lower bearings installed in the cylinder, a re-expansion phenomenon occurring after the compression is completed in the cylinder and It is an object of the present invention to provide a rotary compressor which prevents a decrease in volume efficiency.

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

2 is a vane operating state diagram of a conventional rotary compressor,

(A) Top view of the vane of the rotary compressor.

(B) is re-expansion state of rotary compressor.

Figure 3 is a longitudinal sectional view of the rotary compressor of the present invention.

4 is a plan view of the present invention rotary compressor.

Figure 5 is a suction inlet application state of the present invention rotary compressor.

6 is a state diagram of the coupling between the suction port and the pipe of the present invention rotary compressor,

(A) shows the state of connection by welding of inlet and pipe.

(B) is the welding and o-ring combination state of inlet and pipe.

(C) is the connection state using inlet and pipe tap.

(D) is a state in which the suction pipe is combined with a double pipe.

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

101: airtight container 102: rotor

103: Stator 104: Cylinder

105: crankshaft 106: roller

107: Bain Spring 108: Bain

109: discharge port 110: upper bearing

111: lower bearing 112: inlet

113: Home 114: Accumulator

115: suction pipe 115a: double pipe

Rotary compressor according to the present invention for achieving the above object, the sealed container; A rotor and a stator installed in the sealed container; A crank shaft which is shrinked by the rotor and rotates together with the rotor; A roller which slides and rotates of the crankshaft; A cylinder having a space in which the roller is rotated; In the rotary compressor comprising an upper and lower bearings fixed to the upper and lower parts of the cylinder, and an accumulator connected to one side of the sealed container, the lower bearing is formed with a suction port penetrating the upper and lower surfaces, the cylinder A groove is formed, and a suction pipe connected to the accumulator is fixed to the suction port.

Hereinafter, with reference to the accompanying drawings will be described the configuration and operation of the rotary compressor according to the present invention.

3 is a cross-sectional view showing a rotary compressor according to the present invention, Figures 4 and 5 are a plan sectional view showing a rotary compressor according to the present invention. And, Figure 6 is a cross-sectional view showing a coupling state of the suction pipe of the rotary compressor according to the present invention.

As shown, the rotary compressor of the present invention is composed of a rotor 102 and a stator 103 which are electric elements in the sealed container 101, and the rotor 102 is shrinked so that the rotor 102 The crankshaft 105 which rotates eccentrically in the cylinder 104 with rotation, the roller 106 which swivels and rotates to this rotation shaft 105, and the vanes spring 107 and the back pressure on the outer periphery of the said roller 106. The vane 108, which is press-contacted and performs a linear reciprocating motion, and the refrigerant gas introduced into the cylinder 104, start a suction stroke when the vane 108 is in the top dead center position, and the crank shaft 105 and the roller ( A discharge port 109 and a discharge valve (not shown) which are gradually compressed by the rotational movement of the 106 and discharge the high-temperature, high-pressure refrigerant gas are provided.

The inlet 112 through which the refrigerant gas is sucked is formed in the upper bearing 110 or the lower bearing 111 or both the upper and lower bearings. The suction port 112 is preferably vertically penetrated from the upper surface of the lower bearing 111 to the lower surface.

A groove 113 for guiding the refrigerant gas from the suction port 112 to the suction chamber of the cylinder 104 is formed on the upper surface of the cylinder 104 corresponding to the suction port 112 of the bearing.

In order to prevent volume loss during re-expansion in the cylinder 104 and to prevent power loss during the initial compression process, the inlet 112 of the bearing has an angle of 40 ° based on the center of the cylinder 104 and the center of the vane 108. Form within.

In addition, the suction pipe 115 connecting the suction port 112 and the accumulator 114 may be a double pipe 115a or a heat insulating material containing pipe (not shown) or a coated pipe (not shown) to insulate the refrigerant gas. Form.

In addition, the inlet 112 is formed in an oval or rectangular shape in order to minimize the angle between the center of the cylinder 104 and the vane 108.

The operating state of the rotary compressor of the present invention will be described as shown in FIGS. 3 to 6.

First, as shown in FIG. 3, the suction port 112 of the compressor is installed in the upward direction in the cylinder 104.

The inlet 112 may be installed at both the upper bearing 110 or the lower bearing 111 or the upper and lower bearings 110 and 111 at the same time. In this case, the inlet 112 is installed at the lower bearing 110. For example, the case is as follows.

As shown in FIG. 4, the inlet 112 installed in the bearing part is located within γ = 40 ° based on the center of the vane 108 and the cylinder 104 in the cylinder 104, and sufficient inlet 112 is provided. In order to form, a groove in the form of a half moon groove 113 may be machined into the cylinder 104.

Then, the suction pipe 115 is inserted into the shell of the compressor to be connected to the suction port 112 processed in the bearing part and the external accumulator 114, and connected by welding or tapping the bearing part. .

In order to prevent the volume loss caused by re-expansion in the existing structure as described above, the processing position of the suction port 112 was changed, but the principle is as follows.

The main reason for the volume loss is that the refrigerant gas sucked by the gas that is expanded during re-expansion is leaked to the outside. Since the 106 closes the inlet 112, the inhaled refrigerant gas is prevented from leaking to the outside.

Preventing the outflow of the suction gas increases the volume efficiency, which is also linked to the performance improvement effect of the compressor. In addition, by reducing the area of the suction port 112 causing the roller 106 to interfere with the suction port 112, it is possible to greatly reduce the phenomenon that only the power loss occurs without a compression process up to 40 ° in the existing structure.

In addition, the shape of the suction port 112 installed in the bearing may be formed in an oval shape or a slim shape or a rectangular shape in order to minimize the angle between the center of the cylinder 104 and the vane 108.

As shown in (a), (b), (c), and (d) of FIG. 6, the method of connecting the suction port 112 and the suction pipe 115 may be installed by welding or O-ring application or tapping. The shape of the suction pipe 115 connecting the suction port 112 may be configured as a heat insulating material or a double pipe 115a to facilitate mounting and improve volumetric efficiency.

By forming an intake port through which refrigerant gas is sucked into the upper bearing, the lower bearing, or both the upper and lower bearings, it is possible to prevent the volume efficiency from being lowered due to the leakage of the refrigerant gas when re-expansion occurs in the cylinder, and to prevent the loss of power during the initial compression process It can work.

Claims (4)

Airtight containers; A rotor and a stator installed in the sealed container; A crank shaft which is shrinked by the rotor and rotates together with the rotor; A roller which slides and rotates of the crankshaft; A cylinder having a space in which the roller is rotated; In the rotary compressor comprising an upper and lower bearings fixed to the upper and lower parts of the cylinder, and an accumulator connected to one side of the sealed container, the lower bearing is formed with a suction port penetrating the upper and lower surfaces, the cylinder And a groove is formed and a suction pipe connected to the accumulator is fixed to the suction port. The rotary compressor of claim 1, wherein the suction port is formed at a position within a 40 ° angle with respect to the center of the cylinder (104) and the center of the vane (108). The rotary compressor according to claim 1, wherein the suction pipe (115) is a double pipe (115a) or a heat insulating material containing pipe or a coated pipe. The rotary compressor of claim 1, wherein the suction port is formed in an elliptical or rectangular shape in cross section.