JPH0388984A - Scroll type fluid machine - Google Patents

Abstract

PURPOSE:To enhance the sealing performance between a stationary and a moving vane and improve the efficiency of a compressor by furnishing a communication path which puts a compression chamber and the back face of a chip seal in communication with the center of a spiral vane. CONSTITUTION:Air-tightness of a stationary vane 2a and a moving vane 1a with respect to respective end plates 1b, 2b facing the end faces 1d of these vanes, at the time of compressive operation, is achieved by a chip seal 6 to be inserted in grooves 1e, which are provided at the end faces of the stationary vane 2a and moving vane 1a. In the center of these spiral vanes, a communication path 1f is formed to put the back face of the chip seal 6 in communication with compression chambers 3a-3c. Thereby the high pressure in the compression chamber 3b in the center of vanes is led to the back face of the chip seal 6 to press it to the mating end plates 1b, 2b vigorously. Thus the air-tightness can be enhanced.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a scroll-type fluid machine with improved sealing performance of a compression chamber.

(Prior Art) In conventional scroll-type fluid machines, the seal between the blade end surface of a fixed scroll or an orbiting scroll and an end plate facing the blade end surface is formed by a groove width provided on the spiral blade end surface. This was done by inserting a slightly narrower chip seal and pressing this chip seal against the opposing end plate by the pressure of compressed gas that entered through the tiny gap between the chip seal and the groove.

(Problems to be Solved by the Invention) In such a sealing method using the tank bottom, if the gap between the tip seal and the groove is made minute, the pressing force of the compressed gas will be difficult to act on, and sufficient airtight performance cannot be obtained. If the gap between the tip seal and the groove is widened to allow sufficient gas pressure to act, gas leakage through this gap will increase, and in any case, it is difficult to prevent gas leakage and improve compression performance. Ta.

This invention was made to solve such problems, and the purpose is to provide a highly efficient scroll-type fluid machine that has good airtight performance by applying sufficient gas pressure to the back surface of the tip seal. There is.

[Structure of the Invention] (Means for Solving the Problems) This invention provides a spiral fixed wing provided on a fixed scroll, a spiral swirl wing provided on an orbiting scroll, an end plate of the fixed scroll, and a spiral wing provided on an orbiting scroll. A compression chamber is formed with the end plate, and compression is performed by rotating the fixed scroll and the orbiting scroll relative to each other.
During this compression action, the airtightness between the fixed wing and the swirling wing and the mirror plates facing the wing end surfaces of these wings is achieved by a chip inserted into a groove provided in the wing end surface of each of the fixed wing and the swirling wing. A scroll-type fluid machine using a seal is characterized in that a communication passage is provided in the center of the spiral blade to communicate the back surface of the tip seal and the compression chamber.

(Function) With this configuration, the high pressure in the compression chamber at the center of the blade is guided to the back of the tip seal, strongly pressing the 7' seal against the opposing head plate to improve airtightness. I can do it.

(Example) An example of the present invention will be described below with reference to the drawings. FIG. 1 is an enlarged perspective view of the central part of a spiral swirling blade for explaining the present invention, and FIG. FIG. 3 is a sectional view mainly showing the orbiting scroll and fixed scroll portions for explaining the general configuration of the scroll type fluid machine of this embodiment.

In Figs. 1, 2, and 3, 1 is an orbiting scroll;
Reference numeral 2 denotes a fixed scroll, and the orbiting scroll 1 and the fixed scroll 2 are respectively provided with spiral-shaped swirling wings 1a and fixed wings 2a as shown in FIG. The shaped parts are combined to form an orbiting scroll 1. A crescent-shaped compression chamber 3a is provided in a portion of the fixed scroll 2 surrounded by each end plate 1b, 2b.
.

3b and 3c are formed.

In the scroll type fluid machine of this embodiment, as shown in FIG. 3, a fixed scroll 2 is fixed to a case 4, and an orbiting scroll 1 is connected to a crankshaft 5b connected to a shaft 5a of a motor 5 and an Oldham ring (not shown). A swirling motion is performed between the fixed scroll 2 and the compressed gas taken in by the suction pipe 4a through compression chambers 3a, 3b, and 3c sequentially in the direction of the spiral centers 1c and 2c of the swirling blade 1a and fixed blade 2a. The compressed gas is compressed and sent to the discharge pipe 4b through the discharge port 2d of the fixed scroll 2.

As shown in FIG. 1, a tip seal 6 for maintaining airtightness between the swirler blade 1a and the mirror plate 2b is inserted into a groove in the end surface 1d of the swirler blade 1a, which faces the end plate 2b of the fixed scroll 2. 1e is provided along the spiral airfoil,
The width of this arm 1e is made slightly larger than the width of the chip seal 6 in order to maintain airtightness. Further, on the side surface between the compression chambers of the center part 1c, which is the end of the spiral of the swirler blade 1a, there is a connection for guiding the pressure of the compression chamber 3b shown in FIG. A passage 1f is provided, and in order to efficiently guide this pressure into the gap, the groove 1e in the portion where the communication passage 1f is provided has a deep groove portion 1h which is deeper than other portions due to a step 1g. This step 1g forms a space for introducing pressure between the back surface 6a of the inserted chip seal 6 and the bottom surface of the deep groove portion 1h.

The tip seal 6 is inserted into the groove 1e including the deep groove portion 1h of the swirler blade 1a configured as described above, and the compression chambers 3a, 3b,
Form 3c.

The fixed blade 2a of the fixed scroll 2 has a similar configuration, and the chip seal 6 maintains airtightness between the fixed blade 2a and the end plate 1b of the orbiting scroll 1a.

The compression action of the orbiting scroll 1 and the fixed scroll 2 configured in this way is such that the pressure in the compression chambers near the respective centers lc and 2c is highest, that is,
The pressure in the compression chamber 3b in the figure is higher than the pressure in the compression chamber 3a, for example. The pressure in the compression chamber 3b is introduced into the gap between the spiral groove 1e and the back surface 6a of the tip seal 6 from the communication path 1f through the space between the bottom surface of the deep groove 1h of the swirler 1a and the tip seal 6. This pressure presses the back surface 6a of the chip seal 6 and presses the chip seal 6 against the end plate 2b of the fixed scroll 2 to maintain complete airtightness.

FIG. 4 is an enlarged perspective view of the central part of the spiral swirl blade 1a for explaining the second embodiment.
e is formed to have a uniform depth; instead, the thickness of the part of the chip seal 6 inserted into the groove 1e, which is inserted into the part where the communication path 1f is provided, is made thinner. A space is formed between the thin wall portion 6b and the bottom surface of the groove 1e to improve the efficiency of pressure introduction from the communication path 1f.

According to this embodiment, since the depth of the grooves is uniform, processing of the groove 1e is easy.

FIG. 5 is an enlarged perspective view of the central part of the spiral swirler 1a for explaining the third embodiment, and in this embodiment, the groove 1
The groove e is formed to have a uniform depth, and the chip seal 6 is also configured to have a uniform thickness. This is an example in which

According to this embodiment, the pressure in the compression chamber 3b is
The structure is simplified because it is directly guided to the back surface 6a of the chip seal 6 through the hole f.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be modified and implemented without changing the gist.

[Effects of the Invention] According to the present invention, the pressure of the compression chamber with the highest compression ratio is guided to the back of the tip seal, and this tip seal is pressed against the opposing end plate, so that the pressure between the fixed and rotating wings is The sealing performance is improved and the efficiency of the compressor can be increased.

[Brief explanation of drawings]

FIG. 1 is an enlarged perspective view of the central part of a spiral swirling vane for explaining the present invention, and FIG. 2 is a plan view showing the relationship between the swirling vane of the orbiting scroll and the fixed vane of the fixed scroll in the same embodiment. FIG. 3 is a cross-sectional view of the orbiting scroll and fixed scroll part main body for explaining the general configuration of the scroll type fluid machine of the same embodiment, and FIGS. 4 and 5 are the orbiting scrolls of the second and third embodiments, respectively. FIG. 3 is an enlarged perspective view of the center portion of the wing. 1...Orbiting scroll 1b...End plate ld...Blade end surface 1f...Communication path 1h...Deep groove portion 2...Fixed scroll 2b...End plate 3a, 3b. 3C...Compression chamber 1a...Swirl blade IC...Center portion 1e...Groove Ig...Step 2a...Fixed blade 4...Case 4b...Discharge pipe 5. ...Motor 5b...Crankshaft 6...Chip seal 6b...Thin section 4a...Suction pipe 5a...Shaft 6a...Back side

Claims (1)

[Claims] A compression chamber is formed by a spiral fixed wing provided on the fixed scroll, a spiral swirl wing provided on the orbiting scroll, an end plate of the fixed scroll, and an end plate of the orbiting scroll,
A compression action is performed by making these fixed scrolls and orbiting scrolls rotate relative to each other, and during this compression action, the airtightness between the fixed blades and the orbiting blades and their respective end plates facing the blade tip surfaces of these blades is maintained. In a scroll-type fluid machine using a tip seal inserted into a groove provided in a blade end surface of each of the fixed blade and the rotating blade, the back surface of the tip seal and the compression chamber are provided in the center of the spiral blade. A scroll-type fluid machine characterized by providing a communication path for communication.