JPH05157070A - Oil feeding device for scroll type fluid machine - Google Patents

Abstract

PURPOSE:To omit an inlet valve by opening one end of an inlet route to the side wall of a cylinder of a pump, and by opening/closing it by a skirt part of a piston, in the case of an oil feeder of a scroll type fluid machine for feeding oil by reciprocating the piston for the pump through rotational movement of a rotational scroll. CONSTITUTION:A piston 101 is fitted into a cylinder chamber 102 formed on a fixed scroll 1 so that the piston can be freely put in and out, and a pump 100 to be provided on a scroll fluid machine is thus formed. The piston 101 is energized to the outside by a spring 103, and is followed by a tilted surface 29 formed on an end plate 21 of a rotational scroll. An inlet route 92A is formed on the fixed scroll 1, facing a pump chamber 104 formed by the piston 101, while the end part opened to the side wall of the cylinder 102 is opened/closed by the skirt part of the piston 101. The other end of the inlet route 92A is opened into a pooled lubricating oil 81 on the inner bottom part of a closed housing 8 through a check valve 121. The pump chamber 104 is appropriately communicated to a discharge port 106 through a passing route 120.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil supply device for a scroll type fluid machine.

[0002]

2. Description of the Related Art The applicant of the present invention first issued a patent application No. 23 of 1991.
The technique proposed by No. 7095 will be described below as a conventional technique. FIG. 2 is a vertical sectional view of a conventional scroll type fluid machine. As shown in the figure, a scroll-type compression mechanism C and an electric motor M for driving the scroll-type compression mechanism C are arranged inside the hermetically-sealed housing 8 installed substantially horizontally. The scroll type compression mechanism C allows the revolution movement of the fixed scroll 1, the orbiting scroll 2, and the orbiting scroll,
A rotation preventing member 3, such as an Oldham link, which prevents the rotation, a frame 6 to which the fixed scroll 1 and the electric motor M are fastened and supported, a main bearing 71 and a sub bearing 72 which support the rotating shaft 5, and an orbiting scroll 2. Slewing bearing 7
3 and thrust bearings 74 and the like.

The fixed scroll 1 comprises an end plate 11 and a spiral wrap 12 provided upright on the inner surface thereof.
1 is provided with a discharge port 13 and a discharge valve 17 for opening and closing the discharge port 13. The orbiting scroll 2 is provided with an end plate 21 and a spiral wrap 22 erected on the inner surface of the end plate 21, and a drive bush 25 is disposed inside a boss 23 erected on the outer surface of the end plate 21 via a orbiting bearing 73. An eccentric pin 53 protruding from the inner end of the rotary shaft 5 is rotatably fitted in an eccentric hole formed in the drive bush 25. A balance weight 84 is attached to the eccentric pin 53. Revolving radius ρ of fixed scroll 1 and orbiting scroll 2
A plurality of closed spaces 24 are formed point-symmetrically with respect to the center of the vortex winding by eccentricity and shifting by 180 °.

By driving the electric motor M, the rotary shaft 5, the eccentric pin 53, the drive bush 25,
The orbiting scroll 2 is driven via an orbiting drive mechanism including a boss 23, and the orbiting scroll 2 revolves on a circular orbit having an orbiting radius ρ while being prevented from rotating by a rotation preventing member 3. Then, the gas enters the closed housing 8 through the suction pipe 82, cools the electric motor M, and then passes through the passage 85 formed in the frame 6 to suck the suction passage 1.
5 is sucked into the closed space 24 through the suction chamber 16.
Then, as the volume of the closed space 24 decreases due to the orbital movement of the orbiting scroll 2, the space is compressed and reaches the central portion, and the discharge valve 17 is pushed open from the discharge port 13 to enter the discharge cavity 14 and further discharge. It is discharged to the outside through the pipe 83.

At the same time, the lubricating oil 81 stored in the bottom of the closed housing 8 passes through the suction passage 92 and is disposed between the fixed scroll 1 and the orbiting scroll 2 in the pump 1.
00, is urged, and lubricates the bearing 72, the eccentric pin 53, the bearing 71, the rotation preventing member 3, the slewing bearing 73, the thrust bearing 74, etc. through the oil supply passage 93, and then the chamber 61,
It is discharged through the oil drain hole 62 and stored in the bottom portion of the closed housing 8. Reference numeral 63 is a pressure equalizing hole for equalizing the pressure in the chamber 61 and the space inside the closed housing 8.

FIG. 3 is a vertical cross-sectional view of an oil supply device mainly including the pump 100 provided in the scroll type fluid machine, and FIG. 4 is a piston passage and an intake port of the oil supply device.
It is a mutual positional relationship diagram with a discharge port. In FIG. 3, 10
Reference numeral 1 denotes a piston, which is fitted in a cylinder chamber 102 having a circular cross section formed in the fixed scroll 1 and is supported so as to be retractable along the direction of the orbiting axis. This piston 101 has a cup shape, and a spring 103 arranged behind it.
The tip end surface is slidably brought into close contact with the inclined surface 29 formed on the end plate 21 of the orbiting scroll 2. The tip surface of the piston 101 and the inclined surface 29 are inclined in the radial direction. As shown in FIG. 4, the inclined surface 29 has a suction port 105 communicating with the suction passage 92,
A discharge port 106 communicating with the discharge passage 93 is opened, and a semi-arc shaped communication port 120 is formed in the tip end surface of the piston 101.

When the orbiting scroll 2 orbits with an orbiting radius ρ, the piston 101 reciprocates along the direction of the orbiting axis due to the tip end surface of the piston 101 slidingly contacting the inclined surface 29, and accordingly, the piston 101 and the cylinder chamber. The volume of the pump chamber 104 formed by 102 increases or decreases. At the same time, the suction port 105 and the discharge port 106 communicate with the communication port 120 at a predetermined timing as shown in FIG.

When the volume of the pump chamber 104 is maximum, θ =
If it is 0 °, the piston 10 is rotated between θ = 0 ° and 180 °.
Since 1 is pushed by the inclined surface 29, the volume of the pump chamber 104 decreases, and the communication port 120 and the discharge port 106 communicate with each other.
The lubricating oil in the pump chamber 104 is sent out from the discharge port 106 to the oil supply passage 93. Further, when θ = 180 ° to 360 °, the piston 101 is pushed out by the spring 103, and the suction port 105 communicates with the communication port 120, so that the lubricating oil from the suction passage 92 passes through the suction port 105 and the pump chamber 10.
4 is inhaled.

In this example, the piston periodically moves in the radial direction or the axial direction by the periodical displacement in the radial direction based on the revolution revolving motion of the revolving member, and the volume of the pump chamber changes at the same time. Since the fluid discharge port and the fluid suction port open to the pump chamber at a predetermined timing, the fluid sucked into the pump chamber from the fluid suction port is urged and discharged from the fluid discharge port to a desired location. Further, since the volume of the pump chamber is increased or decreased by utilizing the revolution revolving motion of the revolving member and the fluid suction port and the fluid discharge port are opened in the pump chamber at predetermined timings, the suction valve and the discharge valve are unnecessary. There is.

[0010]

In the case of the previously proposed pump having an inclined surface, the suction port serves as a piston communication. Therefore, in order to effectively use the amount of lubricating oil in the oil sump portion, the piston position must be changed. It was necessary to lower or lower the orbiting scroll.

The present invention proposes a structure in which the suction port can be provided at the lowermost part of the oil sump, so that the lubricating oil in the oil sump can be effectively utilized.

[0012]

DISCLOSURE OF THE INVENTION The present invention is to solve the above-mentioned problems, in which a scroll type fluid machine is housed in a hermetically sealed housing, and the piston of a pump is driven by the orbiting motion of an orbiting scroll constituting the fluid machine. In a refueling device of a scroll type fluid machine that reciprocates to supply a lubricating oil enclosed in the hermetic housing to a required location, a cylinder in which the piston reciprocates in one end of an intake passage leading to the pump. And a skirt portion of the piston that opens and closes, and the other end of the suction passage is opened in the lubricating oil at the bottom of the housing. is there.

[0013]

Since one end of the suction passage is opened to the side wall of the cylinder and is opened and closed by the skirt portion of the piston, the lubricating oil is circulated without the suction valve. Since the other end of the suction passage opens into the lubricating oil at the bottom of the housing, the lubricating oil at the bottom can be effectively used.

[0014]

1 is a cross-sectional view of an embodiment of an oil supply apparatus of the present invention. In the figure, 92A is a suction passage provided in the fixed scroll 1 so as to extend to the pump chamber 104,
One end thereof is opened in the side wall of the cylinder 102 and is opened and closed by the skirt portion of the piston 101, and the other end is opened in the lubricating oil in the bottom portion of the housing 8.
By providing the suction passage 92A, the suction passage 92 and the suction port 105 provided in the end plate 21 of the orbiting scroll in the conventional technique (FIGS. 4 and 5) are eliminated. The parts other than the above are the same as in the prior art.

In this embodiment, when the orbiting scroll 21 rotates and the piston 101 retracts, the piston 10
By setting the passage 120 provided in No. 1 and the discharge port 106 provided in the orbiting scroll 21 to match, the lubricating oil flowing into the cylinder 102 is discharged, and passes through the oil supply passage 93 to the compressor. Will be supplied to the required locations.

The cross-sectional area of the cylinder 102 is A, and the piston 1
When the outer diameter of 01 is d, the inclination angle of the inclined surface 29 is φ, and the orbiting radius of the orbiting scroll is ρ, the moving amount of the orbiting scroll is 2ρ, and therefore the stroke S of the reciprocating motion of the piston 101 is S = 2ρ tanφ Therefore, the volume change amount ΔV of the pump is ΔV = AS. However, in the present embodiment, the effective stroke is reduced by the width B of the suction passage 92A in the reciprocating direction of the piston 101, so the effective volume change amount is ΔV = A (SB).

If a mechanism such as a check valve 121 for preventing the outflow of the lubricating oil from the cylinder pump chamber 104 to the oil reservoir is provided in the suction passage 92A, a larger volume change rate ΔV can be obtained.
Is obtained and the efficiency is improved.

As described above, the suction passage 92A of this embodiment has its end opening at the bottom of the oil sump of the housing 8, so that the lubricating oil at the bottom of the oil sump can also be used effectively. You can

[0019]

In the oil supply device of the scroll type fluid machine of the present invention, one end of the suction passage leading to the pump is opened to the side wall of the cylinder in which the piston reciprocates, and the skirt portion of the piston opens and closes. Since the other end of the suction passage is opened in the lubricating oil at the bottom of the housing,
Lubricating oil at the bottom of the housing oil sump can also be used effectively.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of an oil supply device of the present invention.

FIG. 2 is a vertical cross-sectional view of a conventional scroll type fluid machine.

FIG. 3 is a vertical cross-sectional view of a conventional oil supply device.

FIG. 4 is a mutual positional relationship diagram of a piston passage, a suction port, and a discharge port of a conventional oil supply device.

[Explanation of symbols]

 1 Fixed Scroll 6 Frame 8 Housing 21 Orbiting Scroll End Plate 29 Slope 81 Lubricating Oil 92, 92A Suction Passage 93 Oil Supply Passage 100 Pump 101 Piston 102 Cylinder 103 Spring 104 Pump Chamber 105 Suction Port 106 Discharge Port 120 Through Port 121 Non-return valve

Claims (1)

[Claims] 1. A scroll-type fluid machine is housed in a hermetically sealed housing, and a piston of a pump is reciprocated by the orbiting motion of an orbiting scroll constituting the fluid machine, so that the lubricating oil sealed in the hermetically sealed housing is required. In a lubrication device for a scroll type fluid machine that supplies oil to a pump, one end of an intake passage leading to the pump is opened in a side wall of a cylinder in which the piston reciprocates, and is opened and closed by a skirt portion of the piston. An oil supply device for a scroll type fluid machine, wherein the other end of the suction passage is opened in the lubricating oil at the bottom of the housing.