JPH04171293A - Enclosed type compressor - Google Patents

Abstract

PURPOSE:To prevent poor lubrication and seizure by making the tip of a blade fittingly-inserted in a slot which is drilled in a rotating shaft come into slidingly-contact with the inner peripheral surface of a cylinder to partition the cylinder chamber into an oil suction chamber and an oil discharge chamber, and drilling a suction port in the cylinder and a discharge port in the rotating shaft. CONSTITUTION:The outer peripheral surface 5a of a rotating shaft 5 is made to come into slidingly-contact with a part A of the inner peripheral surface 31c of a cylinder 31, and a crescent moon-shaped cylinder chamber 33 is bounded. A blade 36 is fittingly- inserted into a slot 35 drilled at the lower edge part of the rotating shaft 5 so that it may appear freely, and partitions the cylinder chamber 33 into an oil suction chamber 38 and an oil discharge chamber 39. The tip of the blade 36 comes into contact with the inner peripheral surface 31c of the cylinder slidingly with the rotation of the rotating shaft 5, and appears in the cylinder chamber 33. Then, lubricating oil 81 accumulated at the bottom part of a sealed housing 8 is sucked into the oil suction chamber 38 through a suction port 40, and lubricating oil in the oil discharge chamber 39 is discharged into a centrifugal pump 51 through a discharge port, 41. With this constitution, it is thus possible to supply oil to the sliding part of a compressor mechanism completely even if the rotational speed of the rotating shaft decreases.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hermetic compressor incorporating a scroll type compression mechanism, a rotary type compression mechanism, etc.

(Conventional technology) FIG. 3 shows an example of a conventional hermetic compressor.

As shown in FIG. 3, inside the sealed housing 8, there is a scroll type compression mechanism C in the upper part, and an electric motor M in the lower part.
is installed.

The scroll type compression mechanism C allows the fixed scroll 1, the orbiting scroll 2, and the orbiting scroll 2 to revolve around each other, but a rotation prevention member 3 such as an Oldham ring that prevents rotation, the fixed scroll 1, and the electric motor M are fastened. It consists of a frame 6, an upper bearing 71 and a lower bearing 72 that pivotally support the rotating shaft 5, an orbiting bearing 73 that supports the orbiting scroll 2, a thrust bearing 74, and the like.

The fixed scroll 1 includes an end plate 11 and a spiral wrap 12 erected on its inner surface, and the end plate 11 is provided with a discharge port 13 and a discharge valve 17 for opening and closing the same.

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 bushing 25 is mounted on the orbiting bearing 7 in a post 23 erected on the outer surface of the end plate 21.
3, and an eccentric pin 53 protruding from the upper end of the rotary shaft 5 is rotatably fitted into an eccentric hole formed in the drive bush 25. A bounce weight 84 is attached to this drive bush 25.

A plurality of sealed spaces 24 are formed point-symmetrically by making the fixed scroll 1 and the orbiting scroll 2 eccentric to each other by the revolution radius and meshing them with each other at an angle of 180'.

By driving the electric motor M, the rotating shaft 5
, the eccentric bin 53, the drive bush 25, and the boss 23, the orbiting scroll 2 is driven, and the orbiting scroll 2 revolves on a circular orbit having a revolution radius while being prevented from rotating by the rotation prevention mechanism 3.

Then, the gas enters the housing 8 through the suction pipe 82, cools the electric motor M, and then passes through the suction passage 85 provided in the frame 6 and into the suction chamber 16 from the suction passage 15 provided in the fixed scroll l. The liquid is sucked into the closed space 24 through the air. Then, as the volume of the closed space 24 decreases due to the revolving movement of the orbiting scroll 2, it reaches the central part while being compressed, pushes open the discharge valve 17 from the discharge boat 13, enters the discharge cavity 14, and further discharges. It is discharged to the outside through a pipe 83.

At the same time, the lubricating oil 81 stored in the inner bottom of the housing 8 is pumped into the centrifugal pump 5 provided in the inner lower part of the rotating shaft 5.
1 and passes through the oil supply hole 52 to the lower bearing 72, the eccentric bottle 53, the upper bearing 71, the rotation prevention member 3,
After lubricating the swing bearing 73, thrust bearing 74, etc., the chamber 6
1. The oil is drained through the drain hole 62 and stored at the bottom of the sealed housing 8.

In the hermetic compressor described above, the pressure of the lubricating oil discharged from the centrifugal pump 51 is proportional to the square of the rotation speed of the rotating shaft 5. If it is low, the supply of lubricating oil to each sliding part may be insufficient, leading to poor lubrication and a potential seizure accident based on this.

(Means for Solving the Problems) The present invention has been proposed to solve the above problems, and its gist is that the present invention is incorporated into the lower part of the rotating shaft of the compression mechanism built into the sealed housing. In the hermetic compressor, the lubricating oil stored in the inner bottom of the hermetic housing is sucked by a centrifugal pump, and the sliding part of the compression mechanism is supplied with the lubricating oil. The outer circumferential surface of the lower end of the rotary shaft is brought into sliding contact with the inner circumferential surface of the cylinder at one point, thereby limiting the crescent-shaped cylinder chamber and allowing the rotary shaft to move freely into and out of the slot bored at the lower end. The cylinder chamber is partitioned into an oil absorption chamber and an oil drainage chamber by sliding the tip of a blade inserted into the cylinder into sliding contact with the inner circumferential surface of the cylinder, and the lubricating oil stored at the inner bottom of the sealed housing is supplied to the cylinder. A hermetic compressor, characterized in that a suction port is provided in the suction chamber, and a discharge port is provided at the lower end of the rotary shaft to discharge oil in the oil drainage chamber into the centrifugal pump. be.

(Function) Since the present invention has the above-mentioned configuration, the tip of the blade comes into sliding contact with the inner circumferential surface of the cylinder as the rotary shaft rotates, so that the blade moves in and out of the cylinder chamber.

Then, the volume of the oil suction chamber increases and the volume of the oil drain chamber decreases, and the lubricating oil stored at the bottom of the sealed housing is sucked into the oil suction chamber through the suction port, and the lubricating oil in the oil drain chamber is It is discharged into the centrifugal pump through the discharge port.

(Example) One embodiment of the invention is shown in FIGS. 1 and 2.

Figure 1 is a partial longitudinal cross-sectional view of a hermetic compressor, and Figure 2 is a partial longitudinal sectional view of a hermetic compressor.
It is a sectional view taken along the line ■-■ in the figure.

In the figure, reference numeral 31 denotes a cylinder that surrounds the lower end of the rotary shaft 5 in an eccentric manner, and is fixed to the closed housing 8 via a support member 32. This cylinder 3] is cup-shaped, and the rotary shaft 5 passes through its bottom Fi 31a in an oil-tight and slidable manner and is inserted into its cylindrical cavity 31b. The lower opening of the cylinder 31 is connected to the cover 4.
It is blocked by 2. Inner peripheral surface 31 of Frinzo 31
The crescent-shaped cylinder chamber 33 is limited by slidingly contacting the outer circumferential surface 5a of the rotary sawmill 5 with one location A of c. Reference numeral 35 denotes a slot bored at the lower end of the rotary shaft 5, and a blade 36 is fitted into the slot 35 so as to be freely retractable. This blade 36 has its tip 3
6a is in sliding contact with the inner circumferential surface 31c and partitions the cylinder chamber 33 into an oil absorption chamber 38 and an oil drainage chamber 39. 40 is cylinder 3
One end of the suction port 40 communicates with lubricating oil 81 stored at the bottom of the sealed housing 8, and the other end communicates with the oil suction chamber 38. Reference numeral 41 denotes a discharge port bored at the lower end of the rotary shaft 5, one end of which communicates with the oil drain chamber 39 near the blade 36, and the other end communicates with the inside of the centrifugal pump 51.

The rest of the structure is the same as the conventional one shown in FIG. 3, and corresponding members are given the same reference numerals.

When the rotary shaft 5 is rotated in the direction of the arrow by driving the electric motor M, a centrifugal force based on this rotation acts on the blade 36, and the blade 36 moves inside the slot 35 with its tip 36a slidingly contacting the inner peripheral surface 31c. haunt. As a result, when the volume of the oil suction chamber 38 increases, the lubricating oil 81 at the inner bottom of the sealed housing 8 is guided into the oil suction chamber through the suction port 40, and on the other hand, when the volume of the oil drain chamber 39 decreases, this oil drain chamber 39 The lubricating oil inside is discharged into the centrifugal pump 51 through the discharge port 41.

In this way, as the rotating shaft rotates 50 times, lubricating oil is continuously discharged from the oil drain chamber 39 into the centrifugal pump 51, and is urged by the centrifugal pump 51 to pass through the oil supply hole 52 and to the lower bearing 72 (not shown) and the eccentric pin. 53, after lubricating the sliding surfaces of the scroll type compression mechanism C such as the upper bearing 71, the rotation prevention member 3, the swing bearing 73, and the thrust bearing 74, the chamber 61 and the oil drain hole 6 are lubricated.
2 and is stored at the inner bottom of the sealed housing 8.

Therefore, the rotation speed of the rotating shaft 5 is low and the centrifugal pump 51
Even if the pressure of the lubricating oil discharged from the compressor is reduced, it is possible to supply oil to the sliding portion of the compression mechanism.

(Effects of the Invention) In the present invention, the lubricating oil stored in the inner bottom of the sealed housing can be continuously discharged into the centrifugal pump as the rotary shaft rotates, so the rotation speed of the rotary shaft decreases. Even when the discharge pressure of the centrifugal pump decreases, it is possible to reliably supply oil to the sliding parts of the compression mechanism, and poor lubrication and seizure due to this can be prevented.

[Brief explanation of the drawing]

1 and 2 show one embodiment of the present invention, with FIG. 1 being a partial longitudinal sectional view and FIG. 2 being a sectional view taken along I-I&I in FIG. 1. FIG. 3 is a longitudinal sectional view of a conventional hermetic compressor. Sealed housing-8, rotating shirt)-5, centrifugal pump-51, lubricating oil-81, cylinder 31, cylinder chamber-
33, Slot - 35, Blade - 36, Oil absorption chamber - Fig. 3 Procedure correction blind operation) First month, 1991, f day

Claims (1)

[Claims] A hermetic compressor that sucks lubricating oil stored at the bottom of the hermetic housing and supplies it to the sliding parts of the compression mechanism by a centrifugal pump built into the lower part of the rotating shaft of the compression mechanism built into the hermetic housing. A cylinder is provided to surround the lower end of the rotating shaft, and the outer circumferential surface of the lower end of the rotating shaft is connected to one of the inner circumferential surfaces of the cylinder.
The crescent-shaped cylinder chamber is limited by slidingly contacting the rotary shaft, and the tip of the blade, which is removably inserted into a slot bored at the lower end of the rotating shaft, is slidably contacted to the inner circumferential surface of the cylinder. The cylinder chamber is partitioned into an oil suction chamber and an oil drainage chamber, and the cylinder is provided with an inlet for sucking lubricating oil stored at the inner bottom of the sealed housing into the suction chamber, and the lower end of the rotating shaft is A hermetic compressor characterized in that a discharge port for discharging oil in the oil drainage chamber into the centrifugal pump is provided in the part thereof.