JPH04103203U - scroll type fluid machine - Google Patents

Abstract

(57) [Summary] [Purpose] By preventing the fixed scroll 1 from overturning, fluid leakage from the meshing sliding surface between it and the orbiting scroll is prevented, and at the same time, galling, abrasion, and seizure of the meshing sliding surface are prevented. do. [Structure] The spiral center of the spiral wrap 12 of the fixed scroll 1 and the center O of the end plate 11 are aligned, and back pressure chambers 40 and 42 are formed on a concentric circle of this center O. A support point F is arranged point-symmetrically with respect to the center O on a diameter passing through the center O.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a scroll type fluid machine used as a compressor or an expander.

0002

[Conventional technology]

2 to 4 show an example of a conventional closed scroll type fluid machine. . 8 is a sealed housing consisting of a cylindrical housing 8a and an upper housing that closes the upper part of the housing 8a. Consists of Zing 8b. The inside of this sealed housing 8 is a discharge cover 31. Therefore, it is partitioned into a high pressure side 44 and a low pressure side 45. The upper edge of the cylindrical housing 8a is This discharge cover is butt welded to the bottom surface of the discharge cover 31. The lower end edge of the upper housing 8b is butt welded to the upper surface of the upper housing 31. Inside the low pressure side 45, there is a scroll type compression mechanism C at the top and an electric motor at the bottom. M are arranged, and these are interlocked and connected to each other via a rotating shaft 5. The electric motor M consists of a rotor Ma and a stator Mb, and the rotor Ma is connected to a rotating shaft 5. The stator Mb is fixed by being press-fitted into the cylindrical housing 8a. There is.

0003 The scroll type compression mechanism C includes a fixed scroll 1 and an orbiting scroll 2. . The fixed scroll 1 includes an end plate 11 and a spiral wrap 12 erected on the inner surface of the end plate 11. A discharge port 13 is provided in the center of this end plate 11. The orbiting scroll 2 includes an end plate 21 and a spiral wrap 22 erected on the inner surface of the end plate 21. , a drive bush 54 has a swing bearing 73 in a boss 23 erected on the outer surface of this end plate 21. A slide hole 55 drilled in this drive bush 54 is rotatably fitted through the drive bush 54. An eccentric pin 53 protruding from the upper end of the rotating shaft 5 is slidably fitted inside. There is.

0004 The fixed scroll 1 and the orbiting scroll 2 are eccentric from each other by a predetermined distance, and A plurality of sealed spaces 24 are formed by interlocking with each other with angles shifted by 180°. ing. The orbiting scroll 2 slides automatically onto a casing 6 fixed in a closed housing 8. The orbiting scroll 2 is supported between the orbiting scroll 2 and the casing 6. Rotation barrier consisting of Oldham link etc. that allows rotational movement but prevents rotation. A stop mechanism 3 is provided.

[0005] A flange 14 formed on the outer periphery of the fixed scroll 1 and protruding from the upper end of the casing 6 A support spring 32 in the form of a thin plate is disposed between the legs 6b, and both ends of the support spring 32 are connected to the bolts. The central part is fastened to the flange 14 by a bolt 36, and the center part is fastened to the leg 6b by a bolt 37. It is. In this way, the fixed scroll 1 can float freely via the support spring 32. It is supported by the casing 6. On the back side of the end plate 11 of the fixed scroll 1, there is a concentric cylindrical flap centered at its center. screws 15 and 16 are provided to protrude upward, and the discharge cover 31 is placed between them. A cylindrical flange 39 protruding downward from the lower surface is fitted in a sealed and slidable manner. As a result, an intermediate pressure chamber 40 surrounded by these is formed, and this intermediate pressure chamber 40 communicates the gas with the closed space 24 in the process of being compressed through the pressure guiding hole 41 drilled in the end plate 11. ing. 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 circumferential side.

[0006] The upper end of the rotating shaft 5 is supported by an upper bearing 71 provided in the casing 6, and the lower end The lower end is supported by a lower bearing 72 provided on the stay 33, and the lower end is supported by a slug fixed to the stay 33. It is supported by a top plate 75. And in the middle part of this rotating shaft 5 The balance weight 34 is fixed. Casing 6 and stay 33 are fixed pins 35 to the cylindrical housing 8a.

[0007] By driving the electric motor M, the rotating shaft 5, the eccentric pin 53, and the drive The orbiting scroll 2 is driven by an orbiting drive mechanism consisting of a bush 54, a boss 23, etc. The orbiting scroll 2 revolves while being prevented from rotating by the rotation prevention mechanism 3. It revolves around a circular orbit with the radius as its radius. Then, the gas enters the low pressure chamber 45 through the suction pipe 82 and is sealed via a path not shown. is drawn into the space 24. Then, due to the orbiting movement of the orbiting scroll 2, the airtight air is opened. As the volume of the space 24 decreases, it is compressed and reaches the center, and from the discharge port 13. It enters the high pressure side 44 via the high pressure chamber 42 and from here the discharge pipe 83 and the non-return check built in therein. The valve 84 is pushed open and the water is discharged to the outside. At this time, the gas in the high pressure chamber 42 and intermediate pressure chamber 40 is The fixed scroll 1 is pressed against the orbiting scroll 2 by the pressure of the gas, and the closed space is closed. 24 to suppress gas leakage from inside. When liquid is sucked into the sealed space 24, the fixed scroll 1 floats up and absorbs the liquid. This prevents the scroll type compression mechanism C from being damaged.

[0008] At the same time, the lubricating oil stored in the oil reservoir 81 at the bottom of the sealed housing 8 is released from the rotating shaft. It is sucked up from the lower end of the shaft 5 using centrifugal force, and is drilled into the rotating shaft 5. The eccentric pin 53, upper bearing 71, rotation prevention mechanism 3, slewing bearing 73, etc. After lubricating the sliding parts, the oil returns to the oil reservoir 81 via the pipe 61 and is stored there. In the figure, 85 is a temperature sensor for detecting the temperature of the discharged gas, and 86 is this temperature sensor. A cover 87 covering this is a glass-sealed terminal for supplying power to the electric motor M.

[0009]

[Problem that the idea aims to solve]

In the above conventional scroll type fluid machine, the end plate 11 of the fixed scroll 1 is In order to make the diameter as small as possible, the center O of the end plate 11 has a spiral wrap as shown in Fig. 2. 12 along the line connecting the spiral center O1 and the outer end of the spiral wrap 12, i.e. , offset by an amount δ smaller than the orbital radius. And the cylindrical flap The screws 15 and 16 are machined around the center O of the upper end plate 11, and , the supporting point of the fixed scroll 1 is also located on the diameter passing through the center O of the upper end plate 11 for convenience of processing. They are arranged symmetrically with respect to the center O. Therefore, the resultant point of the gas pressure in the sealed space 24 is guided into the high pressure chamber 42 and the intermediate pressure chamber 40. The diameter connecting the center of the input gas pressure and the float support point F of the fixed scroll 1 is Due to the shift, fixed scroll 1 tilts, and as a result, fixed scroll 1 and rotation A gap is created between the meshing sliding surface of the scroll 2 and the air inside the sealed space 24 is generated through this gap. There is a risk of not only gas leakage but also galling, abrasion, seizure, etc. of the meshing sliding surface. There is.

0010

[Means to solve the problem]

This invention was proposed to solve the above problems, and its gist is as follows: However, each fixed scroll is made up of a spiral wrap on the inner surface of the end plate. and the orbiting scroll are interlocked with each other to prevent the rotation of the orbiting scroll. The above-mentioned fixed scroll was installed on the outer periphery of the scroll. If the float is supported by a support spring placed between the flange and the casing, The fluid introduced into the back pressure chamber formed on the back side of the end plate of the above fixed scroll. A scroll-type fluid machine that uses pressure to push toward an orbiting scroll. In the machine, the center of the spiral of the spiral wrap of the fixed scroll and the inside of its end plate are The above-mentioned back pressure chamber is formed on a concentric circle of this center, and the above-mentioned fixation Place the float support point of the scroll on the diameter passing through the above center and point symmetrical about this center. A scroll type fluid machine characterized by being provided with.

[0011]

[Effect]

In this invention, since it has the above configuration, the resultant force of fluid pressure in a closed space is The resultant force of the fluid pressure introduced into the back pressure chamber acts on the center of the end plate, and the float support Since the diameter connecting the points passes through the center of the end plate, the gas pressure load is balanced and the fixed scroll No overturning moment acts on the wheel.

0012

【Example】

One embodiment of the invention is shown in FIG. Align the spiral center of the spiral wrap 12 of the fixed scroll 1 with the center O of the end plate 11. An intermediate pressure chamber 40 and a high pressure chamber 40 are formed on concentric circles centered on this center. ing. Then, the float support point F is a point pair with respect to the center O on the diameter passing through the center O. It is located in the name. The other configurations are the same as the conventional ones shown in FIGS. 2 to 4, and the corresponding members include The same symbols are attached.

[0013] Therefore, the center of the spiral of the spiral wrap 12 of the fixed scroll 1 is the center of the end plate 11. O, so the resultant force of the gases in the multiple sealed spaces 24 is created at the center O of the end plate 11. use In addition, the resultant force of the gas introduced into the intermediate pressure chamber 40 and the high pressure chamber 42 is also centered at O. act. Then, the diameter connecting the float support point F passes through the center O, and the diameter connecting the float support point F passes through the center O. Since the fixed scroll 1 is provided point-symmetrically, there is a moment that causes it to overturn. has no effect.

[0014]

[Effect of the idea]

In this invention, the spiral center of the spiral wrap of the fixed scroll and its end plates are A back pressure chamber is formed on a concentric circle around this center, and a fixed screen is Set the float support point of the roll on the diameter passing through the above center and symmetrical to this center. This prevents the fixed scroll from falling over. This results in fixed screen The roll and the orbiting scroll mesh and slide smoothly, preventing galling or galling of the meshing sliding surface. It is possible to improve the reliability of scroll-type fluid machinery by preventing wear and seizure. The lifespan of can be extended.

[Submission date] April 22, 1991

[Procedural amendment 1]

[Name of document to be amended] Specification

[Correction target item name] 0006

[Correction method] Change

[Correction details]

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. ing. A balance weight 34 is fixed to the rotor Ma of the electric motor . The casing 6 and the stay 33 are fixed to the cylindrical housing 8a by a fixing pin 35.

[Brief explanation of drawings]

FIG. 1 is a sectional view corresponding to FIG. 2 showing one embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG. 3;

FIG. 3 is a longitudinal sectional view of a conventional scroll-type fluid machine.

FIG. 4 is a partial view taken along arrow B in FIG. 2;

[Explanation of symbols]

1 Fixed scroll 11 End plate 12 laps 14 Flange 32 Support spring 6 Casing 40 Intermediate pressure chamber 42 Hyperbaric chamber F Float support point O Center of end plate

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[Procedural amendment]

[Submission date] April 22, 1991

[Procedural amendment 2]

[Name of document to be corrected] Drawing

[Correction target item name] Figure 3

[Correction method] Change

[Correction details]

[Figure 3]

Claims (1)

[Scope of utility model registration request] 1. A fixed scroll and an orbiting scroll each having a spiral wrap erected on the inner surface of an end plate are meshed with each other, and the orbiting scroll is caused to revolve around the orbit while being prevented from rotating on its axis, and the fixed scroll is float-supported by a support spring disposed between a flange provided on its outer periphery and the casing, and the orbiting scroll is supported by fluid pressure introduced into a back pressure chamber formed on the back side of the end plate of the fixed scroll. In a scroll-type fluid machine in which the scroll is pressed toward the fixed scroll, the spiral center of the spiral wrap of the fixed scroll is aligned with the center of the end plate thereof, and the back pressure chamber is formed on a concentric circle around this center. A scroll-type fluid machine characterized in that a float support point of the fixed scroll is provided on a diameter passing through the center and point-symmetrical with respect to the center.