JPH04362201A - Scroll type fluid machinery - Google Patents

Abstract

PURPOSE:To prevent defective sealing of an enclosed space by means of a simple constitution by providing a stopping member which makes contact with a fixed scroll and suppresses the inclining movement. CONSTITUTION:A fixed scroll 1 and a turning scroll 2 where a spriral lap 22 is vertically provided to an end plate 11 are engaged with each other. The fixed scroll 1 is supported in a floatable manner and at the same time, pushingly pressed against the turning scroll 2 by exerting the gas pressure on the external surface of the end plate 11. Here is provided a stopping member 95 which is brought into contact with the fixed scroll 1 and suppresses the inclining movement. This arrangement allows the stopping member 95 to be brought into contact with the fixed scroll 1 and suppress the inclinating movement when the fixed scroll 1 starts inclination, leading to prevention of defective sealing of an enclosed space by means of an extremely simple constitution.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type fluid machine used as a compressor or an expander.

0002

2. Description of the Related Art FIGS. 4 to 6 show an example of a conventional scroll compressor. 8 is a sealed housing,
It consists of a cylindrical housing 8a and an upper housing 8b that closes the upper opening, and the inside thereof is partitioned into a high pressure side 44 and a low pressure side 45 by a discharge cover 31. Inside the low pressure side 45, a scroll type compression mechanism C is disposed in the upper part and an electric motor M is disposed in the lower part, and these are interlocked and connected to each other via the rotating shaft 5. The electric motor M consists of a rotor Ma and a stator Mb.
a is fixed to the rotating shaft 5, and the stator Mb is fixed to the cylindrical housing 8a.

The scroll type compression mechanism C includes a fixed scroll 1 and an orbiting scroll 2. The fixed scroll 1 has an end plate 11 and a spiral wrap 1 erected on its inner surface.
2, and a discharge port 13 is provided in the center of the end plate 11.
is provided. The orbiting scroll 2 includes an end plate 21 and a spiral wrap 22 erected on the inner surface of the end plate 21, and a drive bush 54 rotates via an orbit bearing 73 within a boss 23 erected on the outer surface of the end plate 21. An eccentric pin 53 protruding from the upper end of the rotary shaft 5 is slidably fitted into a slide hole 55 formed in the drive bush 54 .

A plurality of sealed spaces 24 are formed by making the fixed scroll 1 and the orbiting scroll 2 eccentric by a predetermined distance, and meshing them with each other while shifting the angle by 180°. The orbiting scroll 2 is slidably supported on a casing 6 which is fixed to a sealed housing 8 by a fixing pin 35, and there is a space between the orbiting scroll 2 and the casing 6 that allows the orbiting scroll 2 to revolve. A rotation prevention mechanism 3 made of an Oldham link or the like that prevents rotation is provided.

A support spring 32 in the form of a thin plate is disposed between a flange 14 formed on the outer periphery of the fixed scroll 1 and a leg 6b protruding from the casing 6, and both ends of the support spring 32 are connected to the flange by bolts 36. 14, and the central portion is fastened to the leg 6b with a bolt 37. In this way, the fixed scroll 1 is supported by the casing 6 via the support spring 32 so as to be able to float freely. On the outer surface of the end plate 11 of the fixed scroll 1, concentric cylindrical flanges 15 and 16 centered on the center of the end plate 11 are provided to protrude upward. Further, a cylindrical flange 39 is provided on the lower surface of the discharge cover 31 and projects downward. An intermediate pressure chamber 40 is formed by fitting the cylindrical flange 39 between the flanges 15 and 16 in a sealing and slidable manner. Closed space 2 in the middle of compressing gas through
It is connected to 4. A high pressure chamber 42 is formed on the inner circumferential side of this intermediate pressure chamber 40, and a low pressure chamber 43 is formed on the outer circumferential side.

The upper end of the rotating shaft 5 is supported by an upper bearing 71 provided on the casing 6, the lower end is supported by a lower bearing 72 provided on the stay 33, and the lower end is supported by a thrust plate 75 fixed to the stay 33. Supported. This stay 33 is fixed to the cylindrical housing 8a by a fixing pin 38.

[0007] By driving the electric motor M, the orbiting scroll 2 is driven by the orbiting drive mechanism consisting of the rotary shaft 5, the eccentric pin 53, the drive bush 54, the boss 23, etc., and the orbiting scroll 2 is prevented from rotating by the rotation prevention mechanism 3. While being blocked, it revolves around a circular orbit whose radius is the revolution radius. Then, the gas flows into the suction pipe 82
It enters the low-pressure side 45 through the air, and is sucked into the closed space 24 through a not-shown path. Then, as the volume of the closed space 24 decreases due to the revolving movement of the orbiting scroll 2, it is compressed and reaches the central part, enters the high pressure side 44 from the discharge port 13 via the high pressure chamber 42, and from there the discharge pipe 83 A check valve 84 built in the liquid is pushed open and the liquid is discharged to the outside. At this time, the high pressure chamber 42 and the intermediate pressure chamber 4
The fixed scroll 1 is pressed toward the orbiting scroll 2 by the gas pressure within 0, suppressing gas leakage from the closed space 24. When liquid is sucked into the closed space 24, the fixed scroll 1 floats against the elastic force of the support spring 32 and releases the liquid, thereby preventing damage to the scroll type compression mechanism C.

The lubricating oil stored in the oil reservoir 81 at the inner bottom of the sealed housing 8 is sucked up from the lower end of the rotating shaft 5 using centrifugal force, and passes through the oil supply hole 52 bored in the rotating shaft 5 to the eccentric pin. 53, after lubricating the sliding parts such as the upper bearing 71, rotation prevention mechanism 3, and swing bearing 73, the oil returns to the oil reservoir 81 via the pipe 61 and is stored there. In the figure, 34 is a balance weight fixed to the rotor Ma of the electric motor M, 85 is a temperature sensor for detecting the temperature of discharged gas, 86 is a cover that covers this, and 87
is a glass-sealed terminal for supplying power to the electric motor M.

Furthermore, as shown in FIGS. 5 and 6, the center of the back pressure load (hereinafter referred to as back pressure load) that presses the fixed scroll 1 toward the orbiting scroll 2 based on the gas pressure in the intermediate pressure chamber 40 and the high pressure chamber 42 The center of pressure P) is the center O of the end plate 11
The center of the cylinder pressure load that pushes the fixed scroll 1 upward based on the gas pressure in the sealed space 24 (
The in-cylinder pressure center Q) is centered on the center of the base circle X of the spiral of the spiral wrap 12 of the fixed scroll 1 (hereinafter referred to as the base circle center R), and has a radius of 1/2 of the revolution radius. It is moving on circle Y.

0010

[Problems to be Solved by the Invention] In the conventional scroll type fluid machine described above, as shown in FIG.
and the cylinder pressure center Q do not match, so an overturning moment based on the back pressure load that presses the fixed scroll 1 downward and the cylinder pressure load that presses the fixed scroll 1 upward acts on the fixed scroll 1, causing the fixed scroll to collapse. 1 was tilted, and there was a risk that the sealed space 24 would be poorly sealed. especially,
When the base circle center R of the wrap 12 is separated from the center O of the end plate 11 in order to reduce the outer diameter of the end plate 11 of the fixed scroll 1, the distance between the back pressure center P and the in-cylinder pressure center Q As the distance increases, the above danger becomes more significant.

[0011]

[Means for Solving the Problems] The present invention was invented to solve the above problems, and the gist thereof is to provide a fixed scroll having spiral wraps erected on each end plate. and an orbiting scroll are engaged with each other, the fixed scroll is supported so as to float freely, and the end plate is pressed against the orbiting scroll by applying gas pressure to the outer surface of the end plate. A scroll-type fluid machine is characterized in that it is provided with a stop member that suppresses tilting of the scroll-type fluid machine.

0012

[Operation] Since the present invention has the above structure, when the fixed scroll tries to tilt, the stop member comes into contact with the fixed scroll and suppresses the tilting.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the invention is shown in FIGS. 1 and 2. Figure 1 is a partial vertical cross-sectional view of a scroll-type fluid machine.
FIG. 2 is a partial cross-sectional view taken along line BB in FIG. A pair of flanges 14 formed on the outer periphery of the fixed scroll 1 are each provided with a hole 94 penetrating through the flange 14, and a pin 95 erected on the upper end surface of the casing 6 is inserted into the hole 94 in a predetermined position. It is inserted through a gap. The other configurations are the same as the conventional ones shown in FIGS. 4 to 6,
Corresponding members are given the same reference numerals and their explanations will be omitted.

[0014] Therefore, the intermediate pressure chamber 40 and the high pressure chamber 42
An overturning moment acts on the fixed scroll 1 due to the back pressure load based on the gas pressure in the closed space 24 and the cylinder load based on the gas pressure in the sealed space 24, and when the fixed scroll 1 tilts at its permissible angle, the pin 95 hits the hole 94. This contact suppresses tilting of the fixed scroll 1. Therefore, the gap between the hole 94 and the pin 95 is set to be equal to or less than the allowable inclination angle of the fixed scroll 1.

Another embodiment of the invention is shown in FIG. In this embodiment, a hole 96 is formed in the upper end surface of the casing 6, and a pin 97 extending downward from the lower surface of each flange 14 is inserted halfway into the hole 96 with a predetermined gap. Thus, when the fixed scroll 1 is tilted at its permissible angle, the pin 97 comes into contact with the inner wall surface of the hole 96. Therefore, even if an overturning moment acts on the fixed scroll 1, the fixed scroll 1 will not tilt beyond its permissible angle. Note that members corresponding to those in the first embodiment shown in FIG. 1 are given the same reference numerals. In each of the above embodiments, the pins 95 and 97 are brought into contact with the holes 94 and 96 to prevent the fixed scroll 1 from tilting. Needless to say, pins 95 and 97 may be replaced with any shape or structure as long as the pins 95 and 97 are suppressed from tilting.

[0016]

[Effects of the Invention] In the present invention, since a stop member is provided that comes into contact with the fixed scroll and suppresses its tilting, when the fixed scroll tries to tilt, the stop member comes into contact with the fixed scroll and prevents the tilting. suppress. As a result, poor sealing of the closed space can be prevented with an extremely simple configuration.

[Brief explanation of drawings]

FIG. 1 is a partial longitudinal sectional view of a scroll-type fluid machine showing a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view taken along line BB in FIG. 1;

FIG. 3 is a partial vertical sectional view of a scroll-type fluid machine showing a second embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a conventional scroll compressor.

FIG. 5 is a cross-sectional view taken along line AA in FIG. 4;

FIG. 6 is a diagram showing the relative relationships between various load centers.

[Explanation of symbols]

1 Fixed scroll 11 End plate 12 Spiral wrap 2 Rotating scroll 21 End plate 22 Spiral wrap 40 Intermediate pressure chamber 42 Hyperbaric chamber 32 Support spring 95 Stopping member

Claims (1)

[Claims] Claim 1: A fixed scroll and an orbiting scroll each having a spiral wrap erected on an end plate are intermeshed with each other, the fixed scroll is supported so as to float freely, and gas pressure is applied to the outer surface of the end plate. 1. A scroll-type fluid machine that presses against the orbiting scroll by applying a force to the fixed scroll, the scroll-type fluid machine comprising: a stop member that comes into contact with the fixed scroll and suppresses tilting thereof.