JPS6329184Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a rotary compressor, and more specifically, a rotary compressor in which a cylindrical sleeve that rotates with vanes that retract and retract from a rotor that rotates eccentrically is fitted. Regarding. This is used, for example, in the field of rotary compressors used for intake supercharging in engines such as automobiles.

[Prior art]

For example, as a rotary compressor in which a rotary sleeve supported by a shaft with a small gap left in the casing rotates almost synchronously with the rotor while contacting the tip of a vane that protrudes and retracts from the rotor in the radial direction,
There is one described in Figure 15.1a of "Displacement Compressor" published by Sangyo Tosho Co., Ltd. on April 5, 2015. The rotating sleeve of this type of compressor avoids or reduces the wear and heat generated when the vanes, which advance due to centrifugal force as the rotor rotates, slide directly against the inner surface of the stationary cylindrical casing. This is provided to enable high-speed rotation. As a result, the rotating sleeve is required to be rotatably supported within the casing, so in order to form an air bearing layer around its outer periphery, a large number of small holes are drilled to guide the air inside the compressor. Lubricating oil is supplied between the rotating sleeve and the casing to facilitate smooth rotation of the rotating sleeve within the casing. Therefore, the vanes that emerge and retract due to centrifugal force from the rotor, which rotates around an eccentric drive shaft, advance in the radial direction until they come into contact with the rotating sleeve, and as the rotor rotates, the rotating sleeve is dragged by the vanes almost synchronously. The compression chamber expands and contracts while rotating, allowing air to be sucked in, compressed, and discharged.

In this way, the rotating sleeve is supported by the air led out to the air journal on its outer periphery, but as the rotating sleeve rotates, the high pressure in the air journal on the discharge port side is applied to the air journal on the suction port side. As air is admitted, the pressure in that area becomes higher than the inner surface of the rotating sleeve, and the pressure difference acts on the rotating sleeve. As a result, the rotating sleeve is pushed toward the center housing on the discharge port side, and the outer circumferential surface of the rotating sleeve comes into contact with the inner circumferential surface of the casing on the discharge port side, causing local wear and inhibiting the rotation of the rotating sleeve. However, there is a problem in that a large drive torque is required for the rotor. On the other hand, lubricating oil is supplied between the rotating sleeve and the casing, but this may bypass the end of the rotating sleeve and get mixed into the compression chamber. When used as a mechanical supercharger for a motor vehicle, there is the problem that some lubricating oil gets mixed into the compressed intake air, contaminates the intake air, and introduces it into the combustion chamber, inhibiting engine output. .

[Purpose of invention]

The present invention was developed in view of the above-mentioned problems, and its purpose is to adjust the air pressure in the air journal so that the bias toward one side of the rotating sleeve due to uneven pressure acting on the inner peripheral surface of the rotating sleeve is eliminated. Another object of the present invention is to provide a rotary compressor having a rotary sleeve that can suppress contact of the rotary sleeve with the casing to reduce wear, heat generation, and loss of driving torque.

[Structure of the idea]

The features of the rotary compressor with the rotary sleeve of the present invention are as follows. A casing formed of a cylindrical center housing and side housings disposed on both sides thereof and having an intake port and a discharge port, a rotating sleeve rotatably fitted into the casing, and a rotation center of the rotating sleeve. It is equipped with a rotor that is arranged eccentrically relative to the rotor and rotationally driven from the outside, and a plurality of plate-shaped vanes that are fitted into the rotor so as to be freely retractable.The rotation of the rotor rotates the rotating sleeve via the vanes. The rotary compressor is configured to: (i) have a jet hole opened in the side housing on the leading side of the discharge port, and an exhaust passage communicating with the jet hole for discharging air to the outside of the compressor; (ii) ) A suction hole is opened in the center housing so as to communicate with the air journal on the suction port side, and an exhaust passage is provided which communicates with this and discharges air to the outside of the compressor; A negative pressure generator is provided that generates negative pressure by blowing air, and the latter exhaust passage is connected to this.

〔Example〕

Hereinafter, the present invention will be described in detail based on examples thereof. FIG. 1 is a sectional view of a rotary compressor 1 having a rotary sleeve according to the present invention, in which a casing 2 is formed of a cylindrical center housing 3 and side housings 4 disposed on both sides thereof. This side housing 4 is bored with an intake port 5 and a discharge port 6. Outside air is introduced into the intake port 5 through a pipe (not shown), and the compressed air is passed from the discharge port 6 to the intake passage of the engine. It's starting to get discharged. A rotary sleeve 7 is rotatably fitted into the casing 2, and a rotor 8 is disposed eccentrically with respect to the center of rotation of the rotary sleeve 7 and rotationally driven from the outside. The rotor 8 is equipped with a plurality of plate-shaped vanes 9 fitted in the rotor 8 so as to be freely retractable in the radial direction, until these vanes come into contact with the inner peripheral surface of the rotating sleeve 7 due to the centrifugal force accompanying the rotation of the rotor 8. It is now possible to expand. An air journal portion 10 is secured between the outer peripheral surface of the rotary sleeve 7 and the inner peripheral surface of the center housing 3 of the rotary compressor 1. Although the gap width W of the air journal portion 10 is shown exaggerated, it is, for example, about 30 to 50 microns. A large number of small holes 11 are bored in the rotating sleeve 7 for guiding the air inside the compressor 1 to the air journal portion 10 to form an air bearing layer. By the way, a pair of adjacent vanes 9
The compression chamber 12 defined by the compression chamber 12 cannot discharge all of the compressed air at the discharge port 6, and the next suction stroke is carried out with some air remaining in the compression chamber. At this time, the air inside the air reaches a considerably high pressure at the position where the defined volume is minimum, so in order to discharge this air, a jet hole 13 is opened in the side housing 4 on the leading side of the discharge port 6. An exhaust passage 14 is provided which communicates with the compressor and discharges air to the outside of the compressor. On the other hand, in the air journal part 10 on the suction port side N from the compressor's virtual diameter line A, which passes through the tangential seal point P where the outer periphery of the rotor 8 and the inner periphery of the rotating sleeve 7 are closest to each other, the rotation of the rotating sleeve 7 At the same time, high-pressure air from the air journal portion 10 on the discharge port side M flows in, so that the pressure in that portion is higher than the pressure in the rotating sleeve 7 on the suction port side N. Therefore, a suction hole 15 is opened in the center housing 3 so as to communicate with the air journal portion 10 on the suction port side N, and an exhaust passage 16 is provided in communication with the suction hole 15 for discharging air to the outside of the compressor. The air discharged from the former exhaust passage 14 is compressed air with a pressure higher than atmospheric pressure, but the pressure of the air discharged from the latter exhaust passage 16 is measured to be approximately atmospheric pressure. Merely opening the other end of the compressor 1 to the outside of the compressor 1 will not discharge the waste. Therefore, a negative pressure generator 17 is provided which generates negative pressure by exerting the ejector effect of air ejected from the other end of the former exhaust passage 14, and the latter exhaust passage 16 is connected to this. The above-mentioned blowout hole 13 is opened in the side housing 4 which does not slide against the tip of the retractable vane 9, so there is no need to consider wear of the vane 9, and its diameter can be made as large as possible. You can keep it.

According to such an embodiment, it can be operated as follows. First, the rotor 8 is rotated using part of the engine output, and when it rotates in the direction of the arrow 18, the vane 9 is rotated by the centrifugal force.
It advances further in the radial direction, and its tip comes into contact with the inner periphery of the rotating sleeve 7. At the position communicating with the suction port 5, the defined volume of the compression chamber 12 defined by the two adjacent vanes 9 is expanded and air is introduced from the suction port 5, and as the rotor 8 rotates, the defined volume increases. When it reaches the maximum, communication with the suction port 5 is cut off and compression begins. As the compression progresses, the defined area communicates with the discharge port 6, the compressed air is discharged, and after the volume reaches the minimum, the volume is expanded again. In this way, by repeatedly expanding and contracting the compression chamber 12, air is sequentially drawn in and compressed to a high pressure, thereby supercharging the intake air in the engine.

While the rotor 8 and the vanes 9 operate in this manner, the rotating sleeve 7 also rotates substantially synchronously with the movement of the vanes caused by the rotation of the rotor 8. At this time, as the rotary sleeve 7 rotates, the high-pressure air inside the air journal on the discharge port side M is transferred to the air journal on the suction port side N.
0, and its pressure becomes higher than the sub-atmospheric pressure in the vicinity of the suction port 5 in the corresponding rotary sleeve 7. As a result, a pressure difference is generated between the inner and outer surfaces of the rotary sleeve 7, and the rotary sleeve 7 is pressed in the direction of the arrow 19 and moves toward the center housing 3 so as to narrow the width of the discharge port side M of the air journal portion 10. Incidentally, in the compression chamber 12 into which the compressed air is discharged from the discharge port 6, the air that cannot be discharged is further compressed and becomes high pressure. This high-pressure air is automatically discharged to the atmosphere outside the compressor 1 through a jet hole 13 formed on the leading side of the discharge port 6. At this time, since this air is jetted out at high speed from the tip of the exhaust passage 14, the air inside the negative pressure generator 17 is discharged along with the jet flow, and the inside of the negative pressure generator 17 becomes lower than atmospheric pressure. Become. As a result, the air in the air journal part 10 on the suction port side N is led out from the suction hole 15 of the exhaust passage 16 connected to this negative pressure generator 17, the pressure in that part is reduced, and the pressure in the rotary sleeve 7 is reduced. The pressure near the suction port 5 of
As a result, the pressing force of the rotating sleeve 7 in the direction of the arrow 19 on the suction port side N is reduced, and the contact of the rotating sleeve 7 with the inner circumferential surface of the center housing 3 is eliminated, thereby preventing wear and seizure of the rotating sleeve. It is possible to prevent this and further reduce the driving torque. Note that by discharging the air remaining in the compression chamber from the ejection hole, it is possible to eliminate the air remaining in the compressor that would otherwise occur if the air was not discharged. That is, since the intake air amount and the discharge air amount each increase by the amount of residual air, the effect of improving the volumetric efficiency of the compressor is also exhibited. In addition, a compressor that operates in this way does not require a lubricating oil supply for the rotating sleeve, and there is no chance of oil getting into the compressed air, making it necessary to supercharge the engine intake air. This makes it suitable as a compressor.

[Effect of idea]

As can be seen from the description of the embodiments above, the present invention has the following features:
A part of the air that has become high pressure inside the compressor is discharged from the side housing, and the jet flow of that air outside the compressor is used to generate negative pressure, and that pressure is used to release the air at the suction port side. Since the air inside the journal portion is led out, the pressure difference acting on the inner and outer surfaces of the rotating sleeve in that portion can be reduced. Therefore, the force with which the rotating sleeve is pressed against the discharge port side within the center housing can be reduced, and wear and heat generation of the rotating sleeve can be suppressed, and loss of drive torque can be reduced.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a rotary compressor having a rotary sleeve according to the present invention. 2... Casing, 3... Center housing,
4...Side housing, 5...Suction port, 6
...Discharge port, 7...Rotating sleeve, 8...Rotor, 9...Vane, 10...Air journal section, 13...Blowout hole, 14, 16...Exhaust passage,
15... Suction hole, 17... Negative pressure generator.

Claims (1)

[Scope of utility model registration request] a casing formed of a cylindrical center housing and side housings disposed on both sides thereof and having an intake port and a discharge port; a rotating sleeve rotatably fitted within the casing;
A rotor is provided eccentrically with respect to the rotation center of the rotary sleeve and rotationally driven from the outside, and a plurality of plate-shaped vanes are fitted to the rotor so as to be retractable. In a rotary compressor in which a rotary sleeve is rotated through a rotary compressor, an ejection hole is opened in a side housing on a leading side of the discharge port,
An exhaust passage is provided to communicate with this and discharge air to the outside of the compressor.A suction hole is opened in the center housing so as to communicate with the air journal on the suction port side. A rotation system characterized in that a negative pressure generator is provided for generating negative pressure by air ejected from the other end of the former exhaust passage, and the latter exhaust passage is connected to the negative pressure generator. Rotary compressor with sleeve.