JPS61152993A - Rotary compressor - Google Patents

Abstract

PURPOSE:To prevent compression efficiency from worsening due to generation of heat in suction gas through heat generated in delivery gas, by providing a heat insulating material to be arranged in the peripheral surface of a compressing element directly brought into contact with the delivery gas. CONSTITUTION:An enclosed vessel 27, housing in its inside a compressing element, forms in an upper and a bottom surface of the compressing element a silencer 16, 17. A cylinder 1 delivers gas to the both silencers 16, 17, and the delivery gas, after it joins in the upper silencer 16, in introduced to an internal space of the enclosed vessel from a delivery port 19 provided in the upper silencer. A heat insulating material 20, 21, 25, being arranged on the peripheral surface of a side plate 9, 10 and the internal wall of a communication path 18 connecting the both silencers which are directly brought into contact with the delivery gas, prevents heat of the delivery gas from being transmitted to the compressing element.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a rotary compressor, and particularly aims to reduce loss caused by heating of gas sucked into a cylinder.

[Background of the invention]

The rotary compressor used in home air conditioners has an electric motor and a compression element built into a sealed case. Gas is drawn directly into the compression element from outside the case and is compressed within the compression element, producing high-temperature, high-pressure gas. It becomes a gas, is released into the case, and is discharged outside the compressor from a discharge pipe installed in the wheat case. Therefore, since the compression element and the lubricating oil in the case are exposed to high temperature gas, they heat the inhaled gas, and the performance of the compressor deteriorates due to the inlet air heating loss.

Therefore, in order to reduce intake air heating loss, the gas discharged from the compression element is first guided outside the case, cooled by a radiator, and then guided back into the case (Utility Model Application No. 54-2806), or the gas is cooled by a radiator outside the case. A method of cooling the lubricating oil by returning the low-temperature gas to the case.
-159909) etc. are known. These methods are effective in reducing heating loss, but on the other hand, there are problems such as higher product prices and prices due to the installation of the radiator, or difficulty in downsizing the product because it requires space to install the radiator. OBJECTS OF THE INVENTION It is an object of the present invention to eliminate the drawbacks of the prior art described above and to provide a method for reducing the heating of intake gas within the case.

[Summary of the invention]

In the current compressor, the gas discharged from the cylinder of the compression element is integrated with the 5 m pressure element, enters a silencer attached to cover the compression element, and then is discharged into the case. A portion of this silencer is also located in lubricating oil. The gas discharged from the cylinder is the hottest and this gas enters the silencer causing heating of the compression element and lubricating oil.

The present invention is characterized by providing a heat insulating layer to reduce heat exchange between the gas in the silencer, the compression element, and the FF4 oil.

[Examples of actual rights to inventions]

Embodiments of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a longitudinal sectional view of the compressor, and FIG. 2 is a horizontal sectional view of the cylinder portion of FIG.

In the figure, 1 is a cylinder 5 of a rotary compressor R, which is a roller that rotates inside the cylinder 1, and 4 is a crank that rotates the roller 5. The crank 442 is integrated with the rotating shaft 5, and is used for compression related to the drive device. It is driven by a machine motor 15. Reference numerals 9 and 10 denote an upper end plate and a lower end plate that are located at the upper and lower ends of the cylinder 1 and also serve as bearings for the rotating shaft 5. Reference numeral 2 denotes a vane whose tip abuts against the roller 5, is pushed from behind by a spring 6, moves reciprocally as the roller 5 rotates, and partitions the inside of the cylinder 1 into a compression chamber 7 and a suction chamber 8. 14 is a discharge valve, and 15 is a retainer. When the gas in the compression chamber 7 becomes higher than the pressure in the case 27, the discharge valve 14 is deflected and the gas is discharged. Retainer 15
serves as a stopper for the discharge valve 14 at that time. 1
Reference numerals 6 and 17 denote an upper silencer and a lower silencer that are fitted into the upper end plate 9 and the lower end plate 10, into which the gas discharged from the discharge valve 14 is released. 18 is the lower end plate 10
．． Cylinder 1. This is a gas flow path that penetrates the upper end plate 9 and connects the lower silencer 17 and the upper silencer 16 to each other. 19 is an opening provided in the upper silencer 16 through which the gas therein can flow out. It has more than 20,21.2 compression elements.
2 are the lower end plate 10 and the upper end plate 9. They are heat insulating material A, heat insulating material B, and heat insulating material C provided in the lower silencer 17.

In the rotary compressor R configured in this way, when the rotary shaft 5 is driven by the compressor top and bottom, the roller 5 installed in the crank 4 rotates inside the cylinder 1, which is partitioned by vanes. The volumes f'jI of the compression chamber 7 and suction chamber 8 change. When the crank 4 rotates in the direction of the arrow, the volume of the suction chamber 8 increases (becomes) and sucks refrigerant from the suction boat 11, while the volume of the compression chamber 7 decreases and the sucked refrigerant gas is compressed. When the pressure inside the case 27 becomes higher than the pressure inside the case 27, the discharge valve 14 is pushed up and the silencer 16.
It is discharged into the lower silencer 17 and performs a compression action. The gas discharged to the lower silencer 17 flows along arrows A and B, reaches the upper silencer 16, merges with the gas inside the upper silencer 16, and flows out from the opening 19 into the case 25 along the arrow CVc. , and flows to the upper part of the compressor along arrows E, and flows out of the compressor from the discharge pipe 24.

The gas discharged into the lower silencer 1 and upper silencer 16 is at the highest temperature. Therefore, the insulation material A20 made of heat-resistant and refrigerant-resistant low heat and low rate insulation material (e.g. resin, etc.)
．． Insulation material B21. The insulation material C22 is attached to the lower end plate 10.
Upper end plate 9. By providing K in the lower silencer 17, heating of the compression element and lubricating oil by the gas is reduced, and heating loss is reduced.

For example, when resin is used as a heat insulator, the thermal conductivity is λJ
i=Q, 25 kcal/711A'C can be used. Therefore, assuming that the material of the end plate is cast iron, its thickness ζIPC = 6mm Thermal conductivity λPC = 45kcal
/rnh”c, , Heat transfer coefficient αi at the cylinder inner wall of the end plate = 500 kcal/vIIA℃, Size 1 of the end plate
/7 internal heat transfer rate αo= 20Qkcal/rlI℃, the thermal resistance FLo when no insulation material is provided is R6=:: I Aa* + a F C72F C+
17 (111:= 20-5 (”'II:/kcal
). On the other hand, the thickness of the above insulation material is δJ=lx
m, the thermal resistance R in this case is R=1/(!&+δ
F(/QFC+, aφB +1e7'l!o==24-
5 (m"h"clheal), and the thermal resistance is about 20 larger than that in the case where no heat insulating material is provided. That is, the amount of gas heating in the cylinder is reduced by about 20 inches.

In the above example, δB=1nhng, but aB-='
Needless to say, if the thickness is increased to 1 mm, the effect will be even greater.

In the above embodiment, the lower end plate 10. Upper end plate 9. Although all of the lower silencers 17 are provided with heat insulating materials, any one of them may be provided as needed, and if necessary, a heat insulating material D25 may be provided in the gas flow path 18.

In the above explanation, the main problem was heat transfer between the discharged gas and the compression element, but on the other hand, since the compression element is located in oil, heat transfer from the high temperature oil to the compression element also becomes a problem. In the case of FIG. 1, providing the insulation material C22 reduces heating of the oil and also reduces heat transfer from the oil to the compression element. moreover,
As shown in FIG. 2, a heat insulating material E26 may be partially provided in a portion where a temperature lower than the oil temperature of the cylinder 1 is maintained.

Further, another embodiment shown in FIG. 5 will be described as an example of heat transfer from oil to the compression element.

FIG. 5 shows a case where the discharge valve 14 is provided only on the upper end plate. Therefore, the lower silencer 17 and the gas flow path 18 are
This is a case in which the lower end plate is in direct contact with oil, and the rest is exactly the same as the embodiment shown in FIG. In this case, in order to prevent the lower end plate 17 from being heated by oil, the lower end plate 17 is provided with a heat insulating material A20.

The above-mentioned heat insulating material can be easily molded using a mold or the like, and can also be processed by coating or the like depending on the situation, so it is possible to reduce heating loss at an extremely low cost.

〔Effect of the invention〕

As described above, a heat insulating material is provided between the discharged gas and the compression element, or between the oil and the compression element.

This reduces heating of the suction gas and reduces heating losses.

The compressor performance can be improved without inconveniences such as increase in product price and radiator installation space when using a conventional radiator.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a longitudinal cross-sectional view showing one embodiment of the present invention, Fig. 2 is a horizontal cross-sectional view of the cylinder section, and the fifth maple is a longitudinal cross-sectional view showing another embodiment of the present invention. It is. 81...Cylinder, 5...Roller, 5...Shaft, 7
... Compression chamber, 9... Upper end plate, 11... Suction port, 15... Motor, 15... Retainer, 17...
Lower siren 919...opening, 21...insulation material B,
25...Insulation material. 27...Case. f l Figure O 3 Figure

Claims (1)

[Claims] 1. At least a cylinder, a roller that rotates within the cylinder, a crank that rotates the roller, a rotating shaft that is integrated with the crank, and a rotating shaft located at both ends of the cylinder that also serves as a bearing for the rotating shaft. An end plate has a discharge valve on at least one of the end plates, and a silencer provided on the end plate with the discharge valve and its tip abut against the roller and reciprocate according to the rotation of the roller, thereby forming a compression chamber inside the cylinder. 1. A rotary compressor comprising a compression element having a vane partitioning into a suction chamber, characterized in that a heat insulating material is provided between the gas discharged from a discharge valve and the compression element.