ROTARY COMPRESSOR

Abstract

A rotary compressor includes a motor, an eccentric shaft and a cylinder installed in a casing. The motor includes a rotor and a stator. The eccentric shaft rotates with the rotor and turns around in the cylinder. The cylinder divides the casing into a high pressure chamber and a low pressure chamber, and the high pressure chamber is disposed between the motor and cylinder, and the low pressure chamber is disposed at the bottom of the cylinder. An isolating element is installed between the cylinder and the casing for isolating the high pressure chamber and the low pressure chamber. The isolating element includes at least one reflowing hole penetrated through the isolating element and interconnected between the high pressure chamber and the low pressure chamber for isolating high and low pressures effectively.

Description

FIELD OF THE INVENTION

The present invention relates to a rotary compressor, in particular to the rotary compressor capable of isolating high and low pressures.

BACKGROUND OF THE INVENTION

In general, an electric compressor compresses a refrigerant to circulate the refrigerant in a circuit, and basically a DC motor drives the compressor to operate, so as to achieve the effects of compressing and circulating the refrigerant. In different specifications of the compressors, the common ones include models such as rotary compressors, scroll compressors and screw compressors.

The scroll compressor incurs a relatively higher cost due to its high level of difficulty of manufacture. Although both of the rotary compressor and the screw compressor complete the compression by changing the volume of the compressor chamber, yet the rotary compressor adopts a simple compression method and skillfully avoids the problems of the screw compressor including the deviation of the force in an axial direction, clearance volume and internal leakage, so as to improve the reliability and efficiency of the device and obtain a relatively higher market share.

Basically, the rotary compressor is installed at the center of a motor rotor through an eccentric shaft as shown in FIG. 1, and the rotary compressor 10 is installed in the casing 11, and the motor (including a rotor 121 and a stator 122), the eccentric shaft 13 and the cylinder 14 are installed. When the eccentric shaft 13 is rotated together with the motor rotor 121 and turned around in the cylinder 14, the eccentric shaft 13 and the cylinder wall form a series of isobaric compressor chambers (including a first chamber 15 and a second chamber 16) of different volumes, so as to achieve the effect of compressing the refrigerant gradually.

In the aforementioned conventional rotary compressor, the cylinder 14 and the casing 11 are fixed simply by soldering, and there is no sealing component serving as a partition between the first chamber 15 and the second chamber 16. If the casing of the rotary compressor is tilted, the refrigerant in the second chamber will flow to the first chamber, and if the casing of the rotary compressor resumes to its normal using position, the refrigerant will flow to the first chamber and cannot reflow to the second chamber, so as to affect the overall operation performance of the compressor adversely and reduce the efficiency of the compressor. In addition, the cylinder 14 and the casing 11 are fixed by soldering, and this it is necessary to melt the metal at a soldering point of the cylinder 14 and the casing 11, and the soldering process generally requires a high temperature over 1000. The high temperature of the soldering may cause a deformation of the cylinder 14 easily and affects the precision of a micro-scale inner wall of the cylinder 14 significantly. As a result, the cylinder may leak or get stuck easily, particularly for a smaller rotary compressor, and the aforementioned thermal deformation issue is inevitable.

SUMMARY OF THE INVENTION

Therefore, it is a primary objective of the present invention to provide a rotary compressor capable of isolating high and low pressures.

To achieve the aforementioned objective, the present invention provides a rotary compressor comprising a casing having a motor, an eccentric shaft and a cylinder installed therein, and the motor includes a rotor and a stator, and the eccentric shaft rotates with the rotor and turns around in the cylinder, and the cylinder divides the casing into a high pressure chamber and a low pressure chamber, and the high pressure chamber is disposed between the motor and the cylinder, and the low pressure chamber is disposed at the bottom of the cylinder, wherein an isolating element is installed between the cylinder and the casing for isolating the high pressure chamber and the low pressure chamber, and the isolating element includes at least one reflowing hole penetrated through the isolating element and interconnected between the high pressure chamber and the low pressure chamber.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view of a conventional rotary compressor;

FIG. 2 is a schematic view of a rotary compressor of the present invention; and

FIG. 3 is a bottom view of a casing and an isolating element of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

With reference to FIGS. 2 and 3 for a schematic view of a rotary compressor of the present invention, and a bottom view of a casing and an isolating element of the present invention respectively, the rotary compressor comprises a casing 21 having a motor 22, an eccentric shaft 23 and a cylinder 24 installed therein, and the motor 22 comprises a rotor 221 and a stator 222.

The eccentric shaft 23 rotates with the rotor 221 and turns around in the cylinder 24. The cylinder 24 includes upper and lower mounts 241, 242, a cylinder part 243 disposed between the upper and lower mounts 241, 242, and a fixing element 25 (which may be a bolt, a screw, a soldering point, etc, and it is a bolt in this preferred embodiment) installed between the upper and lower mounts 241, 242 and the cylinder part 243 for fixing the three components, and the cylinder 24 divides the casing 21 into a high pressure chamber 26 and a low pressure chamber 27, and the high pressure chamber 26 is situated between the motor 22 and cylinder 24, and the low pressure chamber 27 is situated under the cylinder 24.

An isolating element 28 is installed between the cylinder 24 and the casing 21 for isolating the high pressure chamber 26 and the low pressure chamber 27. In an embodiment as shown in the figure, the isolating element 28 is a flange 281, wherein the flange 281 is integrally extended from the casing 21 and protruded out from an inner wall of the casing 21 to form a circular structure and disposed at the top of the cylinder part 243, and a free end of the flange 281 abuts the upper mount 241 to isolate the high pressure chamber 26 and the low pressure chamber 27, and the isolating element has at least one reflowing hole 282, and the reflowing hole 282 is penetrated through the isolating element 28 and interconnected between the high pressure chamber 26 and the low pressure chamber 27.

In the assembling process, the casing 21 includes an upper casing 211, a lower casing 212 and a case 213, and the flange 281 is disposed in the case 213, and the motor 22 is installed from the top of the case 213 and fixed into the case 213, and the upper casing 211 is covered onto the case 213, and the cylinder 24 is installed into the case 213 from the bottom of the case 213, and at least one fixing element 25 is passed from the bottom of the case 213 through the cylinder part 243 and fixed to the flange 281, and the cylinder 24 is fixed to the case 213. Finally, the lower casing 212 is fixed to the bottom of the case 213 to complete the assembling the compressor. Wherein, the rotary compressor may have three fixing elements 25 for fixing the cylinder 24, and the fixing element 25 may be a bolt or a soldering point.

Since the isolating element 28 is disposed between the cylinder 24 and the casing 21 for isolating the high and low pressures, therefore the performance of the compressor can be maintained at a high level, and if the compressor is tilted, a refrigeration oil flows from the low pressure chamber back into the high pressure chamber to maintain the actual operation performance of the compressor, and the reflowing hole 282 is provided for reflowing the refrigeration oil from the high pressure chamber 26 to the low pressure chamber 27 to give a better circulation. Since the isolating element further uses the fixing element to fix the casing and the cylinder, the issue of the casing being deformed by heat can be avoided.

In addition, the isolating element is installed at the bottom of the cylinder part, or the isolating element is a flange, wherein the flange is fixed in the casing and disposed at the top or the bottom of the cylinder part, and different implementations of the isolating element can achieve the effect of isolating the high pressure chamber and the low pressure chamber for sure.

Claims

1. A rotary compressor, comprising a casing having a motor, an eccentric shaft and a cylinder installed therein, and the motor having a rotor and a stator, and the eccentric shaft rotating with the rotor and turning around in the cylinder, and the cylinder dividing the casing into a high pressure chamber and a low pressure chamber, and the high pressure chamber being disposed between the motor and the cylinder, and the low pressure chamber being disposed at the bottom of the cylinder, characterized in that an isolating element is installed between the cylinder and the casing for isolating the high pressure chamber and the low pressure chamber, and the isolating element includes at least one reflowing hole, and the reflowing hole is penetrated through the isolating element and interconnected between the high pressure chamber and the low pressure chamber.

2. The rotary compressor of claim 1, wherein the cylinder includes upper and lower mounts and a cylinder part disposed between the upper and lower mounts, and a fixing element disposed between the upper and lower mounts for assembling and fixing the upper and lower mounts and the cylinder part.

3. The rotary compressor of claim 2, wherein the isolating element is a flange integrally extended from the casing and disposed at the top of the cylinder part.

4. The rotary compressor of claim 2, wherein the isolating element is a flange integrally extended from the casing and disposed at the bottom of the cylinder part.

5. The rotary compressor of claim 2, wherein the isolating element is a flange fixed in the casing and disposed at the top of the cylinder part.

6. The rotary compressor of claim 2, wherein the isolating element is a flange fixed in the casing and disposed at the bottom of the cylinder part.

7. The rotary compressor of claim 1, further comprising at least one fixing element installed between the isolating element and the cylinder.

8. The rotary compressor of claim 7, wherein the fixing element is a bolt.

9. The rotary compressor of claim 7, wherein the fixing element is a soldering point.

10. The rotary compressor of claim 1, wherein the casing includes an upper casing, a lower casing and a case, and the isolating element is disposed in the case, and the upper casing and the lower casing are covered and fixed to the top and the bottom of the case respectively.

11. A rotary compressor, comprising a casing having a motor, an eccentric shaft and a cylinder installed therein, and the motor having a rotor and a stator, and the eccentric shaft rotating with the rotor and turning around in the cylinder, and the cylinder dividing the casing into a high pressure chamber and a low pressure chamber, and the high pressure chamber being disposed between the motor and the cylinder, and the low pressure chamber being disposed at the bottom of the cylinder, characterized in that the cylinder includes upper and lower mounts and a cylinder part disposed between the upper and lower mounts, and a fixing element is installed between the upper and lower mounts and the cylinder part for assembling and fixing the upper and lower mounts and the cylinder, and an isolating element is installed between the cylinder and the casing, and the isolating element is a flange integrally extended from the casing and disposed at the top of the cylinder part for isolating the high pressure chamber and the low pressure chamber, and the isolating element includes at least one reflowing hole penetrated through the isolating element and interconnected between the high pressure chamber and the low pressure chamber, and at least one fixing element is installed between the isolating element and the cylinder.