JPS608350B2 - Compressor suction muffler device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a suction muffler device for a compressor.

In conventional compressors, two synthetic resin cases are fitted together to form a separate suction muffler, which is fixed to the cylinder block with bolts or the like to form a compression element. The oil flowing out from the upper end of the crankshaft while lubricating each sliding part of the synthetic resin case flows into the suction muffler from the fitting part of the synthetic resin case, especially from the side adjacent to the compression element.
There have been problems with valve damage due to liquid compression, and the liquid circulating through the refrigeration circuit and stagnation on the evaporator side, causing poor cooling. The present invention has been made in view of the above points, and will be described below based on embodiments shown in the drawings. "The compression element 3 is placed on the top of the frame body 2.
An electric compressor body 5 (composed of an electric compressor body 5, which is constructed by connecting both elements with a crank shaft 4) is arranged at the bottom of the electric element (not shown), and an elastic means (7) is placed in a sealed container (6) storing oil (not shown) at the bottom.
It is a hermetic compressor that is suspended and stored in 97. The compression element 3 includes a cylinder block 10 in which a cylinder 8 and a discharge muffler 9 are integrally formed, a cylinder head 11 that closes the opening of the cylinder 8, and a cylinder tab that is connected to the cylinder head from the outside. A suction muffler 13 made of synthetic resin such as polybutylene terephthalate is mounted on a flange portion 12 of a rack 10. The suction muffler 13 is divided into two parts, and includes a first synthetic resin case 7 having a suction hole 15 adjacent to a suction pipe 14 connected to an external cooling circuit (not shown), and an expansion type suction muffling chamber 16 that is fit inside the cylinder 8. , is formed by fitting a second synthetic resin case 21 forming a resonance type suction muffling chamber 20 with a partition plate 19 having a closing part turtle 8 to the suction hole 15 . Reference numeral 22 designates a mounting portion that is formed integrally with the first synthetic resin case 17 and fixes the suction muffler 13 to the cylinder block 10 with bolts 23.

24 is the compression element 3 of the side part 25 that fits into the second synthetic resin case 21 of the first synthetic resin case IT.
It is a double wall formed by providing an L-shaped inner wall 28 that forms a recess 27 into which the iron fitting part 26 of the second synthetic resin case 2 is inserted in the side twill part.

The partition plate 19 is a double wall 24 of the first synthetic resin case turtle 7.
The flat surface 29 of the same layer as the mounting surface of the inner wall 28 forming the inner wall 28 and the competing portion 2 other than the double wall 24 portion of the second synthetic resin case cup
It is sandwiched between 6 and 6. In the suction muffler device for the compressor configured as described above, the suction muffler turtle 8 is mounted on the flange portion 92 of the heavy cylinder block of the compression element 3, and the mounting portion 2 is fixed with the cylinder block outer bolt 29.
The oil flowing out from the upper end of the crankshaft 4 while lubricating each tank moving part of the electric compressor body 5 fills the gap between the suction muffler tatami 8 and the cylinder block group Q, and From the fitting part between the iron joint part 25 of the synthetic resin case 2 and the adjacent part 26 of the second synthetic resin case 2, oil is released due to the pressure difference between the inside of the sealed container 6 and the inside of the suction muffler 3 during intake. There has been a problem that the liquid flows into the suction muffler and causes damage to valves due to liquid compression and stagnation in the evaporator of the external cooling circuit, causing poor cooling. A double wall is formed with an inner wall 28 provided in an L-shape on two sides adjacent to the third side, and the iron joint part 26 of the second synthetic resin case 21 is inserted into the groove 27 of this double wall. In order to fit and iron, the length of the sealing surface of the fitting and competing portion of the saddle near the side of the compression element 3 is doubled, which improves the sealing performance and reduces oil inflow, and the flat surface 29 of the first synthetic resin case lily and the first The partition plate neck 9 is sandwiched between the outer parts 26 other than those inserted into the concave grooves 27 of the second synthetic resin case, and the second synthetic resin case 211 is of the resonant type without the partition plate falling off. A suction silencing chamber 20 can be formed.A small amount of oil flowing into the resonant suction silencing chamber 281 is expelled from the wing crab at the mouth of the partition plate 9 along with the suction gas, and flows into the cylinder groove, resulting in resonance type suction silencing. There is no change in the silencing frequency band due to a decrease in the volume inside the chamber.As described above, the present invention provides an electrically powered suction muffler that is formed by fitting the fitting parts of the synthetic resin case into two parts. In the compressor installed in the compressor body, "the fitting competition part of the synthetic resin case forming the suction muffler is a double-walled recessed groove formed in the adjacent part on the electric compressor body side for insertion competition." Although the length of the sealing surface of the mating section of the synthetic resin case near the electric compressor body is longer and the sealing performance is improved, the small amount of oil that accumulates in the gap between the suction muffler and the electric compressor body is reduced due to the pressure difference. It has practical effects such as being able to prevent a large amount from flowing into the suction muffler.

[Brief explanation of the drawing]

FIG. 3 is a cross-sectional view of a hermetic compressor showing an embodiment of the present invention, FIG. 2 is a partial sectional view of a suction muffler, and FIG. 3 is a cross-sectional view showing the suction muffler in an attached state. Turtle...Hermetic compressor, 5...Electric compressor body "13...
Suction muffler, Army 7...1st synthetic resin case, 21st state...
2nd synthetic resin case, 24...Double wall "2 horses, 26
Book...Tetsugobe, Mitsu 7...Intagamizo. Figure 1 Figure 2 Figure 3

Claims (1)

[Scope of Claims] 1. In a compressor in which a suction muffler formed by fitting the fitting parts of two synthetic resin case parts together is attached to an electric compressor body, the synthetic resin case forming the suction muffler is A suction muffler device for a compressor, characterized in that the fitting part has a double-walled concave groove that is inserted and fitted into a proximal part of the electric compressor body. 2. The suction muffler device for a compressor according to claim 1, wherein the partition plate is clamped at the fitting portion of the synthetic resin case which is divided into two parts.