JPS6313031B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates generally to refrigeration compressors and, more particularly, to a hermetically sealed refrigeration compressor in which the compressor and drive motor are disposed within a hermetically sealed shell.

In a hermetically sealed compressor, the compressor is designed to muffle the suction gas, or to act as a conduit that cools the motor by allowing all the suction gas entering the compressor to flow through at least one portion of the motor. For various reasons, it is often desirable to provide a cover or shroud at one end of the drive motor. Typically, such compressors include a housing containing the actual compressor means, usually a rotary or reciprocating piston and cylinder, and the housing also includes a journal bearing for rotation of the crankshaft. has been done. Generally, the crankshaft extends outwardly from one end of the housing;
The rotor of the motor is fixed to this crankshaft. A stator of the motor surrounds the rotor and is typically secured to the housing, such as by a plurality of bolts extending longitudinally through or adjacent the stator.

The compressor device of the invention is such that the suction gas inlet is arranged on the side of the shell substantially remote from the cover and an inlet opening is provided somewhere in the cover through the cover wall. This structure has the advantage that the volume between the outer shell and the motor compressor unit can be used as an expansion chamber, although there is some loss due to the long length of the suction gas flow path.

For this reason, in the case of the conventional type, for example,
As typified by No. 23895, the return refrigerant gas is configured to pass through the return pipe from the top of the shell and flow onto the cover provided at the upper end of the motor, and from there it contacts the coil end as appropriate and flows down. There is. In all of the other conventional examples, the return refrigerant gas is introduced from the compressor shell or the top of the casing. However, the returned refrigerant gas contains oil for lubricating the compressor, and if this is not removed, the motor will malfunction. For this reason, in conventional models such as Utility Model Application No. 50-127606, a check valve for draining oil is installed at the bottom of the gas introduction chamber formed by the above-mentioned cover to remove oil from the gas. It is almost impossible to repair this check valve in a structural compressor system.

Furthermore, a technique similar to the oil removal means of the present invention described above is used, in which the return refrigerant gas is introduced horizontally into the compressor shell and a gap is provided between the refrigerant gas guide member provided on the motor cover and the oil is removed from this gap. For example, the technique of dripping and removing
9047, the suction refrigerant gas guide member provided on the motor cover is still located at the top of the motor cover, as in the prior art example described above. In this configuration, the return refrigerant gas that is introduced horizontally into the shell and dripped to remove oil has no choice but to flow upward and then follow a curved flow path that flows into the motor from the top of the motor cover.
This not only increases the inflow resistance of the returning refrigerant gas, but also causes the temperature of the refrigerant gas to rise while flowing through this long flow path, which deteriorates the cooling efficiency.

SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a compressor device with the simplest structure, which does not include any moving parts, and which does not cause deterioration in efficiency even though it is provided with oil removal means.

The present invention completely eliminates a complicated structure such as a check valve that includes such moving parts, and provides an oil removal means that is completely trouble-free.

The solution to this problem in the present invention is to provide a suction gas guide member horizontally on the vertically extending side wall of the motor cover. This gas guide member is aligned with the suction gas inlet through the shell. Suction gas flows across the end windings of the motor and through a conduit member which extends into and communicates with compressor means within the housing to which the motor is secured. The suction gas guide member is placed in aligned spaced relationship with the suction inlet of the shell to smoothly guide the suction gas to the cover while providing expansion space between them, and the lubricating oil reservoir in the lower part of the shell is located in an aligned spaced relationship with the suction inlet of the shell. Being in open communication with the surrounding area, this space effectively separates lubricants so that they do not interfere with or adversely affect the operation of the motor and/or compressor, and provides a means for the refrigerant gas to be separated. The suction resistance is reduced as much as possible and efficiency is high.

Further advantages and features of the invention will become apparent from the following description of preferred embodiments, with reference to the accompanying drawings.

An embodiment of the invention is illustrated in a cross-sectional view in FIG. 1 and a top view in FIG. The refrigeration compressor 106 is
Stator 10 fixed to lower housing structure 110
8 and the stator is shown surrounding a rotor 112 fixed to a rotating crankshaft 116. There is also a relatively small air gap 118 between rotor 112 and stator structure 108. Rotor/stator structure 1
a cover member 12 surrounding one end of 12 and 108;
A screw 120 is provided that holds 2.

A suction gas guide member 128 having a generally tubular portion 130 with an outwardly flared end 132 is provided on the cover member 122 along one side thereof. The suction gas guide member 128 is located adjacent to and in axial alignment with the suction gas inlet 134 extending through the compressor unit outer shell 136.
The suction gas guide member 128 serves to more efficiently guide the suction gas into the motor compartment 138 defined by the stator 108 and the cover member 122 while leaving a space 140 between them that allows the suction gas to expand. form between. That is, a lubricating oil reservoir 6 in the lower part of the shell is in open communication with the outer area A of the cover means, thereby assisting in separating entrained oil from the suction gas. The gaseous refrigerant then flows over the top or top end of the motor structure;
End windings 142 of stator 108 and rotor 1
Cool the upper part of 12. This suction gas is then directed through suction gas conduit members 144 and 146 secured to sidewall 148 of cover member 122. These suction gas conduit members 14
4 and 146 are circumferentially spaced from the suction gas guide member 128 and serve to guide suction gas from the motor compartment 138 to a cylinder head 150 which is secured to the lower housing unit 110. and communicates with compressor means located therein. Suction gas conduit members 144 and 146 have inner ends 15 thereof.
6 is preferably secured to openings 152 and 154 in cover member 122 by bending or flaring.

The suction gas guide member 128 may be integrally formed with the cover member 122 or may take the form of a separate conduit member that is secured to the cover member by welding, crimping, or other suitable manner. In either case, the suction gas guide member 128 serves as an effective means for communicating the suction gas into the interior of the motor compartment 138 for muffling the suction gas and cooling the motor while directing associated oil to the suction gas. It serves to provide a space 140 between the suction gas inlet and the suction gas guide member 128 for effective separation of liquid refrigerant from and also carried by the suction gas.

Note that the term "air gap" as used herein is a term used to refer to the space between the rotor and stator of an electric motor. In the compressor described here,
This space is filled with refrigerant gas instead of air.

As can thus be seen, the present invention significantly improves the efficiency of the compressor by smoothing the flow of suction gas within the compressor by adding suction gas guide members to the vertical walls of the motor cover, while reducing the amount of accompanying lubricant and and/or provide space for the suction gas to expand to separate the liquid refrigerant. The suction gas guiding member also directs substantially all of the refrigerant to the motor for cooling and efficient operation.

It will be obvious that various changes, modifications and substitutions may be made to the preferred embodiments of the invention as herein described without departing from the scope of the claims.

[Brief explanation of the drawing]

FIG. 1 is a side view of a hermetic refrigeration compressor according to the present invention, showing a compressor device according to an embodiment of the present invention, mostly in cross section and partially cut away, and FIG. FIG. 2 is a top view of the refrigeration compressor. 106... Refrigeration compressor, 108... Stator, 110... Lower housing, 112... Rotor, 116
...Crankshaft, 118...Air gear, 1
22...Cover member, 128...Suction gas guide member,
134...Suction gas inlet, 136...Outer shell, 138
... motor compartment, 140 ... space, 144 ... suction gas conduit member, 150 ... cylinder head, A ... outer surrounding area of cover member, O ... lubricating oil reservoir.

Claims (1)

[Scope of Claims] 1. A hermetically sealed shell having a fluid inlet communicating within the shell; motor means mounted within the shell; and a motor means drivingly connected to the motor means and having a fluid inlet communicating with the interior of the shell. compressor means having fluid introduction means for horizontally receiving fluid at a certain pressure and discharging said fluid at a higher pressure; and cover means surrounding one end of said motor means and having a fluid introduction opening in a vertical side wall. a refrigeration compressor apparatus comprising: a lubricating oil reservoir in the lower part of the shell that is in open communication with an outer surrounding area of the cover means, a fluid guiding member to the area; is provided horizontally to the fluid inlet and spaced apart from the fluid inlet in its axial direction, and directs the fluid from the fluid inlet through the opening to the motor.
the axial spacing separates lubricating oil from the fluid and returns it to the reservoir, and the fluid guiding member is opposed in the direction of fluid flow. A refrigeration compressor device characterized by having a widened portion.