JPS58211585A - Enclosed compressor - Google Patents

Abstract

PURPOSE:To prevent drop of the volumetric efficiency due to presence of a discharge passage, by forming the discharge passage with a material having a heat conductivity lower than that of the material of a cylinder, and thereby preventing temperature rise of the cylinder near the discharge passage. CONSTITUTION:On the inside of a discharge passage 23, there is provided a heat- insulating cylindrical sleeve 24 which is made of a material having a heat conductivity sufficiently lower than that of the material of a cylinder. Therefore, the temperature rise of the cylinder near the discharge passage 23 that is caused by the high-temperature exhaust gas passed through the discharge passage 23 is extremely small since the heat-insulating cylindrical sleeve 24 functions to reduce the amount of heat transmitted to the cylinder from the high-temperature exhaust gas passed through the discharge passage 23. Thus, since the amount of heat transmitted from the surface of the cylinder wall is reduced, it is enabled to prevent drop of the volumetric efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hermetic compressor mainly used in air conditioners and the like.

A hermetic compressor used in an air conditioner or the like is equipped with a discharge muffler inside its hermetic shell to prevent noise.

That is, discharge from the cylinder 11. In order to remove the power pulsation of the gas after the target and to suppress the discharge valve 1°S4-, the cylinder K+rt m ul is installed so as to cover the gas 1!1 outlet hole.
The muffler has been removed. In this discharge muffler, the can 1θ is generally located below the cylinder, that is, in a position where it is immersed in lubricating oil. For this reason, the cylinder
On the other hand, extra space is required and the noise from the closed shell of the compressor is reduced, in which the discharge muffler, which is also a vibrating body, is immersed in lubricating oil. For this reason, the discharge muffler is installed below the cylinder. If the gas in the discharge muffler is discharged as it is into the lubricating oil reservoir, the lubricating oil will foam and impair the original lubricating function of the sliding parts, so it must be discharged to a place where there is no lubricating oil.
However, as shown in Figure 1, cylinder 1 has been
A discharge muffler 3 is installed in the IIνJ oil sump 2 of the lower blade, and the gas discharged from the cylinder 1 is
After leading to the exit manora 3, the 1 installed on the link '1
The oil was discharged into the cylinder space (+90° without lubricating oil, that is, into the sealed shell 6) through the outlet passage 4.

1 + l output d path 4 is 11; the temperature of the output gas is 11
v] Approximately 20 to 30 degrees Celsius higher than the average temperature of the lubricating oil and cylinder 1
expensive.

L・) Temperature of cylinder 1 V, t, - & VC a
Bye.

・Different distribution (1: q, +1 is this discharge passage 4
In the vicinity of , the temperature distribution of the actually measured cylinder is
As you can see from the figure, the temperature distribution is disordered, and r! l:
Due to the presence of each 4 in fH, the cylinder temperature is about 6~1o
'C was getting high. In this way, if the cylinder temperature becomes high, the cylinder will cool down due to heat transfer from the cylinder wall surface.

The gas temperature at the time of intake became high, and the gas specific volume increased within the cylinder, leading to a decrease in volumetric efficiency. 1. At the same time, the temperature of the intake gas increases, so the temperature of the discharged gas also increases accordingly, and depending on the operating conditions and VC, the durability can be affected greatly.
There was also the fear of causing .

The present invention has been made to solve the problems listed in item 1-! The purpose of this is to prevent the local temperature of the cylinder from increasing due to this near-f force, i.e., outside the temperature of the cylinder ( b (L-closed type that does not disturb and has higher volumetric efficiency than before) 1. To provide a reduced rock ((').

As a configuration for this purpose, the present invention-1 is provided in the / cylinder where high pressure gas is compressed in the cylinder and discharged into the 111 outlet valve through the 111 outlet valve. Ill: III j fl path (L-粁一 (to; i closed/discharge into the L) Configure this discharge passage with a thermal conductivity higher than the thermal conductivity of the material of the cylinder. It is constructed from materials with low values.

Embodiments of the present invention will be described below with reference to FIGS. 3 and 4 of the drawings.

FIG. 3 shows a partial sectional view of a hermetic compressor 1° showing an embodiment of the present invention, in which a compression mechanism section 12 is provided within a hermetic shell 11. FIG. 4 shows a sectional view taken along line B-B' in FIG. The compression mechanism part 12 is rotatably added to the cylinder 13, the shaft 14, and the cylinder 1.
Rotation L rotating within 3:'2. )/15, a vane 16 that slides while always pressing its tip against the outer periphery of the rotary piston 15, a spring 17 that presses the vane 16 against the rotary piston 15, and 1-B1 that surrounds the cylinder 13 from both f111. ~ 4ql + 1 consisting of a bearing 18, a lower bearing 21 having a discharge hole 19 and a discharge valve 2o, a 111 output muffler 22 attached to the F section bearing 21, and a cylinder 13, a 1 part bearing 18, and a lower bearing. 1 for 21
! A 111 outlet passage 23 is provided to communicate the inside of the 1 outlet muffler 22 and a part of the cylinder 1 space-4 in the seal/well 11.

A hollow cylindrical heat-insulating cylinder 24 made of a material with lower thermal conductivity than the material of the cylinder 13 is provided within the discharge passage 23 . For example, if the cylinder material is a metal material such as steel, the material of the heat insulating cylinder 24 has a thermal conductivity of 1 to 1.
Reinforced plastic with double digits lower? A mixture of aluminum oxide, silicon carbide, silicon nitride, etc. is sufficient.

Next, the effect will be explained.

1r in the cylinder 13 due to the rotation of 4II114,! 1
The rotary piston 16 rotates to change the cylinder volume, and the gas is compressed. The compressed gas is discharged into the muffler 22 through the discharge hole 19 provided in the lower bearing 21 as shown by the arrow, and then is discharged into the two-part space of the cylinder inside the sealed shell 11 through the discharge passage 23. 1. At this time, an insulating cylinder 24 with a heat transfer rate of 8 mounds 1, which has a sufficiently lower heat transfer rate than that of the IT cylinder 1, is provided inside the 1!1 outlet passage 23, so the high temperature discharged gas is 111 exit passage 23
'j111fi vortex t, but cylinder U) I!
l Exit V? +23 shoulder f);・1t1AI stitch 1shi1.
It is very small 1. S4: Wara cup 1 heat 111 simple 2
4 suppresses the amount of heat transfer given to the cylinder by the passing gas 111.

Therefore, according to this embodiment, even if the cylinder is provided with a discharge passage through which high-temperature discharge gas flows, the cylinder temperature in the vicinity of the passage does not locally change into two parts, and the cylinder temperature distribution is not disturbed. Therefore, since the amount of heat transferred from the cylinder wall surface can be suppressed, an increase in the temperature of the intake gas during intake into the cylinder can be prevented, and a decrease in volumetric efficiency can be prevented.

In the above embodiment, a heat insulating cylinder was provided inside the discharge passage, but instead, a heat insulating film may be provided on the inner wall of the discharge passage.In short, the discharge passage provided in the cylinder should be placed in a heat insulating relationship with the cylinder itself. Bye.

1” - As has been explained, the closed form 11 according to the invention
The compressor is a closed type 1 in which the high pressure gas compressed in the cylinder is discharged into the closed shell through the discharge passage provided in the cylinder.
A 1mm compressor was constructed, and this discharge passage was constructed of a 4A material having a thermal conductivity lower than the thermal conductivity of the cylinder, so that high temperature discharge gas flows through the discharge Ju circuit provided in the cylinder. Even with J', the cylinder temperature is suppressed due to the kind of insulation effect of the low thermal conductivity material that makes up the cylinder, and the rise in cylinder temperature near the discharge passage is also suppressed, thereby suppressing the rise in the temperature of the suction gas when the cylinder is inhaled. However, it has an excellent effect of preventing the decrease in volumetric efficiency caused by the presence of the discharge passage, which has been seen in the past.

[Brief explanation of drawings]

Figure 1 is a partial sectional view of a conventional hermetic compressor;
The figure shows the rotation angle θ of the cylinder at the AA' cross section in Figure 1.
Fig. 3 is a partially sectional view of a hermetic compressor showing an embodiment of the present invention. FIG. 4 is a sectional view taken along line BB' in FIG. 3. 10... hermetic compressor, 11... hermetic/el, 13, asses cylinder, 20---,
22...Discharge muffler, 23...Discharge passage, 24...Insulated cylinder. Name of agent Patent attorney Toshi Nakao Male 11th or 1st person 1 Figure 2 IJS3 Figure 4

Claims (1)

[Claims] A hermetic compressor is configured in which high-pressure gas compressed in a cylinder is discharged into a discharge muffler by opening a discharge valve, and then discharged into a closed shell through a discharge passage provided in the cylinder,
This discharge passage was constructed of 4A'11, which has a thermal conductivity lower than the thermal conductivity of the cylinder.