JPS60219494A - Rotary compressor - Google Patents

Abstract

PURPOSE:To prevent the generation of seizure due to the difference of thermal expansion by forming a discharged-gas passage contiguously to the suction hole on a cylindrical cylinder, thus reducing the temperature difference between the suction wall side and the discharge side of the cylinder. CONSTITUTION:In the vicinity of the suction hole 14 of a cylinder 13, a discharged-gas passage 18 is formed contiguously in the form of elliptical hole, and after a part of the high-temperature gas discharged from a discharge hole 15 flows-out into a rear case 19, the gas is introduced into the discharged-gas passage. Therefore, the temperature of the cylinder wall in the vicinity of the suction hole rises, and the difference of temperature from the temperature of the cylinder wall in the vicinity of the discharge hole 15 reduces, and the lock phenomenon and the seizure of the compressor due to the difference of the amount of thermal expansion of a compressor member can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to improvements in refrigerant compressors used for automobile air conditioning and the like.

Conventional configurations and their problems In recent years, car air conditioners have become essential for improving the safety and comfort of automobiles, and the demand for them has been increasing year by year. On the other hand, automobiles have recently become more diverse depending on their purpose, and compressors for car air conditioners are also being forced to change. That is, for one thing, the narrowing of the engine room due to the adoption of front-wheel drive (FF) etc. has restricted the physical dimensions, putting pressure on miniaturization.

In addition, to improve the feeling of operation and reduce noise, a quieter compressor was required. For these reasons, the compressor
A transition is being made to a rotary set that is superior in its small size and quietness. Currently, various types of rotary unit compressors have appeared and been put into practical use, and the vane type, which is most advantageous in terms of miniaturization, is becoming mainstream.

FIG. 1 shows an example of a vane type rotary compressor, in which a cylindrical cylinder 1. Rotor with multiple vane grooves 2.
The vane 3° that slides within the vane groove is composed of side plates 4a, 4b, etc. that close the cylinder 1 from both sides.

As mentioned above, rotary compressors have various characteristics, but with the advancement and development of automobiles, many problems have been imposed on them. One of these is improved high-speed durability. That is, in addition to increasing the permissible rotational speed of automobile engines, there is a demand for improving the high-speed durability of the compressor itself.

When the compressor is operated at high speed, first, due to the balance of the refrigeration cycle of the air conditioner system, the suction pressure of the compressor decreases and the compression ratio increases, causing the discharge gas temperature to rise. Furthermore, combined with frictional heat generation due to high speed rotation, the discharge side of the compressor becomes high temperature. On the other hand, as mentioned above, on the suction side, a decrease in suction pressure, that is, a decrease in suction temperature,
Due to the increase in the amount of refrigerant gas, the cylinder wall near the suction hole 5 of the cylinder 1 in FIG. 1 becomes low temperature. Conversely, as described above, the vicinity of the discharge hole 6 on the discharge side becomes high temperature. In this way, the temperature difference in the cylinder 1 increases when the cylinder 1 rotates at high speed. In addition, the rotor 2 and vane 3, which are rotating bodies, are rotated at high speed due to the rise in discharge gas temperature and the heat generation of the bearing 7.
The discharge gas temperature may also reach high temperatures. As a result, the difference in the expansion of the cylinder 1 on the low-temperature side with respect to the expansion of the rotor 2 and vanes 3 increases, and in the worst case, the gap 8°9 between the sides of the rotor 2 and vanes 3 disappears as shown in FIG. If there is no gap between the rotor 2 and the adjacent portion 1o of the cylinder 1, the compressor may become locked.

OBJECTS OF THE INVENTION The present invention aims to improve the durability of rotary compressors by improving the problems caused by temperature differences.

Components of the Invention The present invention provides a discharge gas passage for heating a low-temperature section near the suction hole of the cylinder with high-temperature gas discharged from the cylinder, in order to prevent the compressor from stopping due to the difference in thermal expansion of the parts caused by the temperature difference, as described above. This is intended to be prevented by providing the device adjacent to the suction hole.

DESCRIPTION OF EMBODIMENTS An example of an embodiment of the present invention will be described below with reference to FIG. 3.4.

FIG. 3 is a cross-sectional view of the rotary compressor of the present invention, and FIG. 4 is a cross-sectional view taken along line AA in FIG. 11 is a rotor having a plurality of radial vane grooves, and 12 is a vane that is freely disposed. There is a cylinder 13 having a cylindrical inner wall close to the rotor 11 at one point, and the cylinder 13 has:
A suction hole 14 and a discharge hole 16 are provided. The cylinder is also closed on both sides by side plates 16,17. A discharge gas passage 18 is arranged in the shape of a long hole adjacent to the suction hole 14 of the cylinder 13, and after a part of the high temperature gas discharged from the discharge hole 15 flows into the rear case 19, this discharge gas Passage 1
8. Generally, low-temperature refrigerant gas flows into the cylinder 13 from the suction hole 14, so that the cylinder wall near the suction hole 14 is cooled. After the suction is finished, the refrigerant gas is compressed by the movement of the vanes 2 and the rotor 11 and gradually becomes a high-temperature gas, reaching the maximum temperature near the discharge hole 16. Therefore, the temperature near the discharge hole 15 of the cylinder 13 reaches the highest among the cylinder walls. In the case of the present invention, although the cylinder wall near the suction hole 14 is cooled by the low-temperature refrigerant, it is also heated due to the presence of the discharge gas passage 18, so the cylinder wall temperature near the suction hole 14 is rise,
The difference between the cylinder wall temperature near the discharge hole 15 is reduced and the temperature is made uniform.

As a result, by equalizing the cylinder wall temperature, the amount of thermal expansion due to temperature rise becomes the same for each part of the cylinder 13, and the difference between the amount of expansion of the rotor 11 and vane 12 is reduced, so the suction pressure increases, especially during high speed rotation. .

Even if a sudden drop in temperature, discharge pressure, or temperature rise occurs,
Due to the difference in the amount of thermal expansion of the members of the compressor, gaps between the members disappear immediately, and the compressor does not become locked.

In this embodiment, a case of a perfectly circular type cylinder is shown, but the same applies to an elliptical type vane rotary.

Furthermore, similar effects can be obtained even in the case of a so-called through-slot type in which the vanes pass through the rotor in a negative manner.

In this way, in the rotary compressor of this embodiment, the discharge gas passage is provided adjacent to the suction hole of the cylindrical cylinder, so that the low temperature part is on the suction wall side of the cylinder. It is possible to eliminate the locking phenomenon of the compressor that occurs due to the difference in the amount of thermal expansion of the members due to various factors, and to provide a rotary compressor with excellent durability.

Effects of the Invention A cylinder having a cylindrical inner wall and having a discharge gas passage adjacent to a suction hole, a rotor disposed within the cylinder and having a plurality of vanes, and closing the cylinder from both sides. By configuring a rotary compressor consisting of a side plate and a rear case placed on the end face of the side plate, the vicinity of the suction hole of the cylinder is heated by the flow of high-temperature discharge gas, so that low-temperature suction refrigerant gas is heated. This prevents the temperature from decreasing. As a result, the temperature of the cylinder is equalized,
Cylinder and rotor are the components of a compressor.

Since there is little difference in the amount of thermal expansion of the vanes, it is possible to prevent the minute gaps between the various parts from decreasing, thereby improving the durability of the compressor.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a conventional rotary compressor, Fig. 2 is a longitudinal sectional view of Fig. 1, Fig. 3 is a sectional view showing a rotary compressor of the present invention, and Fig. 4 is A of Fig. -A sectional view. 11...Rotor, 12...Vane, 13
...Cylinder, 14...Suction hole, 15
・・・・・・Discharge hole, 18 Name of agent Patent attorney Medium
Toshio Oo and one other person Figure 2b Figure 113

Claims (1)

[Claims] A cylinder having a cylindrical inner wall and having a discharge gas passage adjacent to an intake hole; a rotor disposed within the cylinder and having a plurality of vanes; and a side plate closing the cylinder from both sides. A rotary compressor consisting of an arc case placed on the end face of the side plate.