JPS62258182A - Hermetic scroll compressor - Google Patents

Abstract

PURPOSE:To reduce rising oil, by forming a groove portion directed downwardly of the closed vessel body of a compressor on the inner wall surface of the vessel. CONSTITUTION:The closed vessel 1 of a compressor 100 comprises an upper chamber 1a and a motor chamber 1b separated from the upper chamber 1a and a compression chamber 7 comprises a fixed scroll member 5 meshed with a rotating scroll member 6. The body portion 2b of the closed vessel 1 has an inner wall surface 2m having a fine groove portion 50 defined on it, the groove portion 50 being directed downwardly of the vessel. Oil deposited on the wall surface drops downwardly along the groove portion 50 by its dead load. Thus, an amount of oil rising in the compressor can be reduced.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a scroll-type closed pressure compressor used as a refrigerant compressor for refrigeration or restriction or a compressor for helium. It concerns the structure of the chamber.

[Background of the invention]

In the conventional device, as described in Japanese Patent Publication No. 58-183887, the refrigerant gas compressed by the scroll compression element first passed through the outer circumference of the stator of the electric motor, and then the oil was separated at the lower part of the chamber. After that, it separates from the outer periphery of the motor's stator and rises again, reaching the upper space of the motor room. As a result, a gas flow path is formed which is guided to the outside via the discharge pipe.

As described above, there is a limit to the oil separation efficiency in the closed container only by the effect of changing the direction of the gas flow path in the 'ga chamber.

Therefore, the amount of oil flowing out of the compressor discharge pipe increases.

Sometimes, when a scroll compressor is continuously rotated by an inverter drive, the above-mentioned oil rising phenomenon becomes noticeable.0 If the oil rising t of the compressor increases, not only the reliability of the compressor itself but also the entire refrigeration cycle will be affected. (e.g., increase in heat transfer performance of heat exchangers and pressure loss in piping), there is a risk of deteriorating performance and reliability.

(Objective of the Invention) The present invention was invented in view of the above-mentioned problems, and it effectively separates oil in a closed container, prevents oil from flowing out of the container, and improves reliability of a compressor. The purpose of the present invention is to provide a bi-closed scroll compressor that improves the performance of the entire refrigeration cycle.

(Summary of the Invention) In order to achieve the above object, the present invention forms fine grooves toward the bottom of the container on the inner wall surface of the body of the hermetic container to promote the adhesion of oil to the body of the hermetic container. The direction of the groove provided on the inner wall surface of the body of the closed container is set in the opposite direction to the rotating force direction of the main shaft, thereby suppressing the phenomenon of oil blowing up.

(Embodiments of the invention) An embodiment of the present invention will be described below with reference to the drawings.

First, an embodiment shown in FIGS. 1 to 8 will be described.

As shown in FIG.
However, the working part 8 is housed below. And -#
The inside of the closed container 1 is divided into an upper chamber 1a and a Gigun@chamber 1b.

A fixed scroll member 5 and an orbiting scroll member 6 are engaged with each other in the compressor section 100 to form a compression chamber (sealed space) 7. The fixed scroll member 5 consists of a disc-shaped end plate 5a and a wrap 5b standing upright on the end plate 5a and formed with an impolied curve or a curve f close to this. It has a mouth 16. The orbiting scroll member 6 consists of a disc-shaped end plate 6a and a wrap 6C that stands upright thereon and is formed in the same shape as the wrap of the fixed scroll. The frame 11 has a bearing part formed in the center thereof, and the rotating shaft 14 is supported by this bearing part.
The eccentric shaft 14ad at the base end of the rotating shaft is inserted into the boss 6C so as to be able to rotate. Further, a fixed scroll member 5 is fixed to the frame 11 by a plurality of bolts, and an Oldham mechanism 12f consisting of an Oldham ring and an Oldham key supports the first part of the frame. Member 5] On the other hand, it is formed so as to rotate without rotating. A motor shaft 141) is integrally connected to the rotating shaft 14 at the lower part thereof, and the motor section 8 is directly connected thereto.

A vertical suction pipe 17 is connected to the suction port 16 of the fixed scroll member 5 through the closed container 1, and is connected to the upper motor chamber through passages 18a, 181) in the upper chamber 1a in which the discharge port 10 is open. It communicates with 1b. This upper electric motor
lb communicates with the lower electric engine compartment IC via a passage (45, 48) between the motor stator 3a and the side wall of the closed container 1. Further, the upper motor chamber 1b communicates with a discharge pipe 19 passing through the closed container 1. Note that llf is a frame pedestal portion for fixing the electric motor 8 to the frame side. Note that the oil flow in the compressor circular portion is clearly disclosed in % Application No. 59-98709, so it will be omitted here.

1 airtight container Upper head plate 2a, body part 2b, $ section head plate 2C
A fine groove portion 50 is formed in the inner wall surface 2m of the body portion 2b of the closed container, as shown in FIG. As a result, the surface area of the container body toward the inner wall is increased, and the adhesion of the oil to the wall surface 2m is improved. The oil adhering to the wall surface is transmitted to the groove portion 50 and falls downward due to its own weight. As the setting position of the groove portion 50, the fine groove may be formed over a distance 11 from the outer end portion 11m of the frame 11 to the vicinity of the upper part of the stator of the twJ machine 8. In addition, there is also a space 45 between the side portions 9 of the outer circumference of the stator that communicates the upper space 1b and the lower space IC of the motor stator portion.
In order to increase the oil flow path in the container, as shown in FIG. It may be formed over the distance 12I from the lower end 2j of the 31IIi portion 2b.

FIG. 2 shows an embodiment in which triangular grooves 50 are uniformly formed along the inner wall of the container body 2b. From the viewpoint of oil separation within the chamber, the pitch P of the grooves is preferably in the range of several hundred microns to several thousand microns. It is preferable that the groove depth 1& is approximately the same as the groove pitch P or about half of the groove pitch P. In addition, from FIG. 2 onward, the shapes of the @ portion 50 and the like are shown in a considerably exaggerated manner for ease of explanation.

FIG. 8 shows an embodiment in which intermittent triangular grooves 50a are set in the vertical direction on the inner wall surface of the body portion 2b of the closed container.

In this case, the groove pitch IJp is also preferably in the range of several hundred microns from the viewpoint of oil separation.

In the embodiments shown in FIGS. 4 and 5, a groove 51 is formed at a length of 2 m on the inner wall surface of the body portion 2b of the closed container, and extends directly toward the bottom of the container. The line groove 51 is a parallel groove formed by cutting a rectangular recess at a slight angle. Parallel grooves 5 extending in the axial direction
1 in multiple layers (multiply) on the body of the container, it is possible to promote the adhesion of oil to the wall surface and to allow the oil to fall smoothly.

As shown in FIG. 4, the gas flow within the closed container is directed in the rotational direction 60 of the main shaft rotor portion 3b and exhibits a circumferential flow directed toward the container side wall surface 2m.

With respect to this circumferential flow, the groove portion 51 is set in a direction opposite to the rotational direction of the main shaft. This makes it possible to suppress the phenomenon of oil blowing up due to refrigerant gas, and it is possible to maintain a small amount of oil rising even during high-speed transmission of the engine.

In the embodiments shown in Figures 1 to 6, the grooves extending in the axial force direction ζ are fitted directly into the body of the closed container, so the oil separation performance of the container itself can be improved without changing the number of parts. On the other hand, there are concerns about its strength as a pressure vessel.

In the embodiment shown in FIG. 6, by using the inner grooved collar member 62, the strength of the container itself can be maintained at the same level as the conventional container, and the oil content ag of the container itself can be increased. Since the other parts are the same as those in the embodiment shown in FIG. 1, the same reference numerals are given and the explanation thereof will be omitted.

The inner surface of FIG.
As shown in the figure.

In the embodiment shown in FIG. 7, a fine rough surface having triangular grooves 63 is formed on the inner wall surface of the thin circular collar member 62.

As shown in FIG. 6, the core collar member 62 is formed in the longitudinal direction from the hermetic terminal portion 43 to the upper surface of the electric motor 3 (dimension 14).

6 and 7 disclose a structure for minimizing oil build-up in which the chamber body 2k) is lined with a thin cylindrical inner grooved collar member 62.

This is often the case when the casing body part 2b is a bath chamber with a rolled plate groove structure, and if the container body part 2b is deformed to the extent that the core (roundness) cannot be properly projected, the inner wall surface of the body part may be damaged. It may not be possible to cut uniformly small grooves. In such a case, by inserting the internally grooved collar member 62 shown in FIG. 6, the problems related to the deformation of the sealed container (thermal deformation, heat deformation, etc.) can be overcome.

(Effects of the Invention) As explained above, according to the present invention: (1) Since the amount of oil coming out of the compressor body can be reduced, not only the reliability of the compressor can be improved, but also the entire refrigeration cycle! 4: Improved capacity (improved cooling capacity and heating capacity due to reduced pressure loss in piping, and improved performance coefficient EKRO)
There is a positive effect. Particularly when speeding up the compressor, there is a remarkable effect on the above items.

(2) The collar member 6 of the present invention, as shown in FIG.
According to the embodiment in which the container 2 is mounted on the inner wall surface of the chamber, the oil separation efficiency of the container itself can be improved, and this structure has excellent assemblability and is highly effective in mass production.

[Brief explanation of drawings]

1 to 3 show one embodiment of the present invention. FIG. 1 is a longitudinal cross-sectional view of a hermetic scroll compressor, FIG. 2 is a partially enlarged perspective view of the body of the hermetic container, FIG. 3 is a partially enlarged perspective view of the body of the hermetic container showing another embodiment, and FIG. Fig. 5 is a cross-sectional perspective view of the body showing another embodiment, Fig. 5 is a plate sectional view of Fig. 4, and Fig. 6 is a longitudinal sectional view of a closed scroll press machine showing another embodiment. , FIG. 7 is a partially enlarged sectional perspective view of the collar member of FIG. 6. 1... Airtight container 1a... Discharge chamber 1b... Motor room 100... Compressor section 3... Electric motor 5...
Fixed scroll member 5a... End plate 5b... Wrap 6... Orbiting scroll member 6a... End plate 6
b... Wrap 16... Suction port 8... Suction chamber 7
...Compression chamber 1o--Discharge port 14...Rotation 4i
14114a... Eccentric shaft 19... Discharge pipe 50.
...Imitation thin adjoining 62...Collar member with inner groove, /""' Agent: Patent attorney Masaru Ogawa Sho No. 1■

Claims (5)

[Claims] 1. A scroll compressor and an electric motor are housed in a sealed container and are connected to each other via a rotating shaft supported on a frame.
The closed container chamber is divided into an upper chamber and a motor chamber, and the scroll extractor has a fixed scroll member and an orbiting scroll member, each having a spiral wrap standing upright on a disk-shaped end plate, which are engaged with each other with the wraps inside. , the orbiting scroll member is engaged with an eccentric shaft portion connected to the rotating shaft to cause the orbiting scroll member to orbit relative to the fixed scroll member without rotating on its own axis, and the fixed scroll member has a discharge port opening in the center; A suction port that opens on the outer periphery is provided, and gas is inhaled from the suction port.
The gas is compressed by moving around the compression space formed by both scroll members to reduce its volume, and the compressed gas is discharged from the discharge port into the upper container chamber, guided to the motor chamber via the passage, and then passed through the discharge pipe. 1. A hermetic scroll compressor for discharging outside the container, characterized in that a groove portion extending toward the bottom of the container is formed in the inner wall surface of the body of the hermetic container. 2. 2. The hermetic scroll compressor according to claim 1, wherein the grooves provided on the inner wall surface of the body of the hermetic container have a fine groove shape with a pitch of several hundred microns to several thousand microns. 3. 3. The hermetic scroll compressor according to claim 1, wherein a plurality of grooves are provided in the inner wall surface of the body of the hermetic container so as to communicate the upper space and the lower space of the electric motor stator part. 4. According to any one of claims 1 to 3, the direction of the groove provided in the inner wall surface of the body of the closed container is set in the opposite direction to the rotational direction of the main shaft. Hermetic scroll compressor. 5. A thin collar member is provided on the outer periphery of the frame that fixes the fixed scroll, and is in contact with the body of the closed container.
The hermetic scroll compressor according to claim 1, wherein a fine groove extending in the axial direction is provided on the inner wall surface of the collar member.