JPH0117670Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention relates to the improvement of hermetic rotary compressors installed in air conditioners, refrigerators, etc.

(B) Prior Art In a conventional rotary compressor, a rotary electric compressor is housed in a lower casing of a closed casing that can be divided into an upper and lower half. The electric motor rotor of the electric compression device is fitted into a stator, and the stator windings protrude above the surface of the stator. A heat shield member is provided to surround the stator winding.

The heat shielding member has a substantially truncated conical cross-sectional shape, and a stepped portion is formed at an intermediate portion of the outer circumferential surface of the heat shielding member. Further, the outer diameter of the large-diameter end of the heat shielding member substantially matches the inner diameter of the lower casing, and is fitted into the lower casing by being lightly press-fitted.

In other words, the heat shielding member is placed with the large diameter side facing down on the lower casing on which the electric motor etc. are mounted, and when it is press-fitted into the lower casing as it is, the large diameter end of the heat shielding member hits the frame side of the stator, and the stator The position of the stepped portion of the heat shield member relative to the heat shield member is determined.

Meanwhile, the upper casing of the closed casing is fitted into the lower casing by conventional means. and,
The end portion of the upper casing is brought into contact with and supported by the stepped portion of the heat shielding member, thereby determining the attachment position of the upper casing with respect to the lower casing.

By covering the stator winding, the heat shielding member prevents the stator winding from being damaged by spatter generated when welding the upper casing and the lower casing (see Japanese Utility Model Application Publication No. 119383/1983).

(c) Problems to be solved by the invention However, in the conventional heat shielding member, the entire circumference of the outer diameter of the large diameter side end of this member is press-fitted into the inner wall of the lower casing and is also applied to the end of the stator. There was a problem in that the lubricating oil accumulated between the heat shield member and the upper casing could not be returned to the bottom of the lower casing.

This project solves the above problem, and provides a hermetic rotary compressor that prevents lubricating oil from accumulating on a plate member (hereinafter referred to as a full plate) that has the same shape and position as a conventional heat shield member. It is intended to.

(d) Means for solving the problem The present invention houses a rotary compression element and an electric element having a rotor and a stator for driving this rotary compression element in a cylindrical case, and oil is applied to the outer periphery of the stator. A notch for return is provided, and a buttful plate for oil separation is provided in the space formed by the lid body that closes the opening of the cylindrical case and the electric element, and a rotary compressor is installed in this space through the outside of the cylindrical case. One end of the discharge connecting pipe communicating with the discharge side of the element is opened, and the buttful plate formed in a dish shape so as to wrap around the winding of the electric element is attached to the electric element, and the inner wall of the cylindrical case is attached to the side wall of the buttful plate. A plurality of protrusions are provided in contact with the cylindrical case, a gap surrounded by the protrusions and the side wall of the baffle plate is used as a passage, and a lead-out hole is provided in the side wall of the buffle plate forming the passage.

(e) Effect By having the structure as described above, the present invention allows the outlet hole of the buttful plate to communicate with the passage formed between the protruding parts of the buttful plate, communicates the inside and outside of the buttful plate, and the outlet hole The lubricating oil is returned to the bottom of the cylindrical case using the cylindrical case and the passage.

(f) Examples The present invention will be explained below based on the embodiment shown in the drawings.

Reference numeral 1 denotes a hermetic rotary compressor, which has an electric element 3 and a rotary compression element 4 press-fitted into a cylindrical case 2, and an opening of the cylindrical case 2 is closed with a lid 5 to form a closed container 6. It is. 7 is lubricating oil stored in the closed container 6. The electric element 3 includes a stator 10 on which a winding 8 is wound and which has notches 9 between the stator 10 and the inner wall of the cylindrical case 2, and a rotary compression element 4.
A rotor 12 press-fitted and connected to a rotating shaft 11 that drives the
It is composed of Reference numeral 13 denotes an L connected to one end of the rotating shaft 11 and supplying lubricating oil 7 to each sliding part.
It is a letter-shaped oil supply pipe. 14 is a space 1 formed by the discharge side of the rotary compression element 4, the electric element 3, and the lid body 5.
5 through the outside of the closed container 6. Reference numeral 16 denotes a discharge pipe connected to an external cooling circuit (not shown) provided on the lid body 5.

Reference numeral 17 denotes a cap-shaped baffle plate provided in the space 15 in the airtight container 6 to enclose the winding 8 of the electric element 3. Part 18, 18,
18 is sandwiched and attached between the stator 10 of the electric element 3 and the lid 5. 19, 20, 21 are passages provided between the protrusions 18, 18, 18 of the buff-full plate 17 and formed in the gap between the buff-full plate and the inner wall of the cylindrical case 2; 19 is always located above the space 15 and forms a gas discharge passage even when the hermetic rotary compressor 1 is placed horizontally or diagonally, and the second passage 20 is located above the space 15 even when the hermetic rotary compressor 1 is placed horizontally. When the hermetic rotary compressor 1 is placed diagonally at an angle of about 20 degrees, which is 90 degrees compared to when the hermetic rotary compressor 1 is placed horizontally, the third passage 21 is located at the bottom and forms a lubricating oil return passage. The second passage 20 is the largest, and the third passage 21 is the smallest, forming a lubricating oil return passage. Reference numerals 22, 22, . . . are lead-out holes that are bored in the baffle plate 17 in which the passages 19, 20, 21 are formed, respectively, and communicate the interior of the buffle plate with the space 15. The outlet opening of the discharge connecting pipe 14 faces the outlet holes 22 , 22 formed in the second passage 20 . Reference numeral 23 denotes a seal seal for the lead wire 24 outlet of the electric element 3 provided on the buffer plate 17.

In the hermetic rotary compressor that can be installed freely, the discharged refrigerant is adiabatically compressed and discharged by the rotary compression element 4 through the discharge connecting pipe 14 into the buffle plate 17 provided in the space 15. It flows in through the outlet holes 22, 20 formed in the second passage 20 of the plate.

The discharged refrigerant that has flowed into the buffle plate 17 separates the lubricating oil 7 mixed therein, flows out from the discharge pipe 16, and circulates through the external cooling circuit. When the hermetic rotary compressor 1 is placed vertically, the discharged refrigerant that flows from the discharge pipe connecting pipe 14 into the baffle plate 17 is separated into gas and liquid within the buffle plate and becomes lubricating oil 7.
from the outlet holes 22, 22... to the passages 19, 20, 21
The discharged gas is returned to the oil supply pipe 13 side through the notches 9, 9... of the stator 10, and the discharged gas is sent to the outlet holes 22,
22... into the discharge pipe 16. At this time, the discharged gas flows into the space 15 from the discharge pipe connecting pipe 14, and the discharged gas does not flow through the electric element 3, making it easier for the lubricating oil 7 to return to the oil supply pipe 13 side. When the hermetic rotary compressor 1 is placed horizontally, the lubricating oil 7 separated within the baffle plate 17 flows into the second passage 20.
The lead-out holes 22, 2 of the baffle plate 17 forming
2, returns to the oil supply pipe 13 side from the notch 9 of the stator 10 via the second passage using the pressure difference between the space 15 and the oil supply pipe 13 side.

Since the second passage 20 is a lubricating oil return passage in a horizontally placed state, unlike other installation conditions, it is not possible to utilize the difference in height, so it is formed large to reduce the resistance when the lubricating oil returns and improve the return of the lubricating oil 7. ing. When the hermetic rotary compressor 1 is placed obliquely at an angle of 20 degrees, the lubricating oil 7 is separated in the full plate 17.
is returned to the oil supply pipe 13 side from the notch 9 of the stator 10 via the third passage using the inclination from the outlet hole 22 of the buff-full plate 17 forming the third passage 21. Since the third passage 21 is a lubricating oil return passage when placed diagonally, it is always located at the bottom and is slanted, so the lubricating oil 7 gathers and flows easily by taking advantage of the oblique orientation, so that it can be ensured even if the passage 21 is formed to the minimum size. Then, the lubricating oil is returned to the oil supply pipe 13 side. 1st aisle 19
Regardless of the installed state of the hermetic rotary compressor 1, the discharge gas from which the lubricating oil 7 has been separated within the baffle plate 17 always flows. When the hermetic rotary compressor 1 is placed vertically, the L-shaped oil supply pipe 13 that supplies lubricating oil 7 to each sliding part is immersed in the lubricating oil 7 stored in the lower part of the hermetically sealed container 6. However, when placed horizontally, the opening at the other end opens vertically to the lower end and is immersed in the lubricating oil 7, while when placed horizontally, the opening at the other end opens horizontally, but the oil from the lubricating oil 7 stored therein is immersed in the lubricating oil 7. The surface rises and is immersed in the lubricating oil, so that the lubricating oil 7 can be reliably supplied regardless of the installation state. A seal gasket 23 that seals the outlet of the lead wire 24 prevents the discharged refrigerant that has flowed into the baffle plate 17 from leaking from the outlet of the lead wire 24 and the lubricating oil 7 from being discharged.

(g) Effects of the invention The hermetic rotary compressor of the present invention houses a rotary compression element in a cylindrical case, and an electric element having a rotor and a stator that drive the rotary compression element, and the outer periphery of the stator. A cutout for oil return is provided in the cylindrical case, and a buttful plate for oil separation is provided in the space formed by the lid body that closes the opening of the cylindrical case and the electric element. One end of the discharge connecting pipe that communicates with the discharge side of the rotary compression element is opened, and the baffle plate formed in a dish shape so as to wrap the winding of the electric element is attached to the electric element, and a cylindrical case is attached to the side wall of the buttful plate. This is because a plurality of protrusions are provided in contact with the inner wall of the cylindrical case, a gap surrounded by the protrusions and side walls of the cylindrical case and the buttful plate is used as a passage, and a lead-out hole is provided in the side wall of the buttful plate that forms this passage. By providing the passage and the outlet hole in communication with each other in the buttful plate, the lubricating oil separated from the discharged gas by the buttful plate is prevented from accumulating on this buffet plate, and the lubricating oil is transferred to the bottom of the cylindrical case by the stator The oil can be returned through the oil return hole. In addition, by providing a plurality of passages and a plurality of lead-out holes in the buttful plate,
Even when the compressor is placed vertically, horizontally, or diagonally, the lubricating oil can be returned to the bottom of the cylindrical case, thereby preventing a shortage of lubricating oil supplied to the sliding parts of the compressor.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a vertically installed hermetic rotary compressor showing an embodiment of the present invention, and Fig. 2 is a -' of Fig. 1.
3 is a cross-sectional view of a horizontal hermetic rotary compressor, and FIG. 4 is a cross-sectional view taken from the line direction.
5 is a sectional view of a diagonally placed hermetic rotary compressor, FIG. 6 is a sectional view taken from the - line direction in FIG.
B is a cross-sectional view and a front view of the full plate. 1...Hermetic rotary compressor, 2...Cylindrical case,
3... Electric element, 4... Rotating compression element, 5... Lid, 7... Lubricating oil, 8... Winding wire, 10... Stator, 15... Space, 17... Bumpy plate, 18,
18, 18... protrusion, 19, 20, 21... passage, 22, 22... lead-out hole.

Claims (1)

[Scope of utility model registration request] A rotary compression element and an electric element having a rotor and a stator for driving the rotary compression element are housed in a cylindrical case, and a cutout for oil return is provided on the outer periphery of the stator, and the cylindrical case A baffle plate for oil separation is provided in the space formed by the electric element and the lid body that closes the opening of the cylindrical case, and a discharge connecting pipe is provided in this space that communicates with the discharge side of the rotary compression element through the outside of the cylindrical case. In a hermetic rotary compressor with one end open, the baffle plate has a dish-like shape and is attached to the electric element so as to wrap around the winding of the electric element, and a cylindrical case is attached to the side wall of the buffle plate. A plurality of protrusions are provided in contact with the inner wall of the cylindrical case, a gap surrounded by the protrusions and the side wall of the cylindrical case and the buttful plate is formed into a passage, and an outlet hole is provided in the side wall of the buttfull plate forming the passage. Features a hermetic rotary compressor.