JPH01301987A - Hermetically sealed type rotary compressor - Google Patents

Abstract

PURPOSE:To secure supply of lubricant to a slide moving part, by forming a disc for partitioning a hermetically sealed container into two spaces in one body with an ejection muffler, between an electric driving element and a compression element. CONSTITUTION:A disc 21 for forming partitioned spaces for housing an electric driving element 4 and a compression element 5 respectively is formed on the periphery of an ejection muffler 12 in one body with it to be reudered an equipment. The ejection port of the ejection muffler 12 is oriented toward a space on the side of the electric driving element 4, a connecting part 23 for connecting a space on the side of electric driving element 4 to a space on the side of the compression element 5 is provided on the disc 21 and an oil supply pipe 1 is fixed to this disc 21. Consequently, it becomes possible to set the level of oil surface of lubricant low in a space on the side of electric driving element 4 and high in a space on the side of compression element 5. In addition, the oil supply pipe 1 fixed to disc 21 is fixed stably along its total length.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a lubricating oil supply structure for a hermetic rotary compressor used in a refrigeration system or an air conditioner.

[Conventional technology]

Figure 10 shows a method for supplying lubricating oil to the sliding parts of a hermetic rotary compressor that compresses refrigerant gas in an air conditioner. This is due to the lubrication method. This figure is a cross-sectional view of an example of the differential pressure oil supply system in which the oil supply pipe 1 is fixed to the frame 2 and oil is supplied. In FIG. 10, 3 is a closed container, 4 is an electric element, and 5 is a compression element. An electric element 4 and a compression element 5 are housed in a closed container 3, and a rotor 6 of the electric element rotates to drive a crankshaft 7 and transmit power to the compression element 5. A compression chamber 11 is partitioned and formed within the cylinder 10 by the rolling piston 8 and vane 9 of the compression element 5. Refrigerant gas is compressed in a compression chamber 11 formed in the cylinder 10 , and the compressed high-pressure refrigerant gas is discharged from a discharge port (not shown) provided in the frame 2 to a discharge muffler 12 . It is made to flow out of the closed container 3 through the discharge pipe 3a. At this time, the vane 9 has a spring 1 attached behind it.
3 toward the rolling piston 8, and when the rolling piston 8 rotates within the cylinder 10 along the inner wall of the cylinder 10, it reciprocates without separating from the rolling piston. As a result, the compression chamber 11 compresses and sucks the refrigerant gas while contracting and expanding. In addition, the refrigerant gas existing in the gap 15 between the inner circumferential side of the rolling piston 8 and the crankshaft wound portion 14 leaks from the gap between the cylinder 10 and the rolling piston 8 to the low-pressure side chamber in the cylinder, so that the pressure in the gap 15 decreases. The lubricating oil 16 that has decreased and is present at the inner bottom of the sealed container is sucked up into the air 11115 through the oil supply pipe 1, and is further supplied to the shaft sliding parts etc. through the groove 17 of the crankshaft 7, etc. There is. Note that this lubricating oil 16 maintains a position that is not disturbed by the rotor 6 of the electric element 4, and lubricates the vanes 9 and the crankshaft sliding parts etc. sufficiently by lubricating the oil supply pipe 1. must be carried out.

[Problem to be solved by the invention]

In the above conventional example, the lubricating oil 1 at the inner bottom of the closed container 3
6 must be kept at a level that allows the vanes 9 and other parts to supply lubricating oil to the sliding parts of the compression elements, and at the same time, the rotational center line of the crankshaft 7 is in a generally horizontal position. ,
There is a problem in that the rotor 6 of the electric element 4 disturbs and scatters the lubricating oil 16, resulting in an increase in the amount of lubricating oil contained in the discharged refrigerant gas. In addition, the oil supply pipe 1 attached to the frame 2 has a cantilever structure when viewed from the frame 2 side, and the oil supply pipe 1 may fall off or break from the frame 2 due to vibrations caused by long-term compressor operation. There was a risk that this would occur. This invention was made in order to solve the above-mentioned problems, and without changing the strength and machining accuracy of each part of the compression element from the conventional ones, ■Securing the supply of lubricating oil to the sliding parts The object of the present invention is to provide a hermetic rotary compressor that can further reduce the amount of lubricating oil contained in the discharged gas, and (1) improve the reliability of the oil supply pipe installation.

[Means to solve the problem]

The closed type rotary pressure m machine of the present invention is provided with a disc that partitions the electric element and the compression element in the closed container to lower the pressure in the space that accommodates the compression element, and a fuel supply pipe attached to the frame. is fixed to this disc. That is, a roughly horizontal crankshaft, an electric element that rotates the crankshaft, and a compression element that compresses gas through the rotation of the crankshaft are housed in a roughly cylindrical sealed container. This compression element consists of a rolling screw installed on the crankshaft, a cylinder that holds the rolling piston inside (ζ), and a cylinder that reciprocates in contact with the rolling piston and partitions the inside of the cylinder into a compression chamber. a discharge port provided on the cylinder or a frame supporting the cylinder to guide the compressed gas in the compression chamber; a generally dish-shaped discharge muffler that receives the compressed gas from the discharge port; It consists of a discharge port and a discharge pipe provided in the sealed container for discharging the compressed gas that has flowed into the sealed container to the outside, and also for supplying lubricating oil to sliding parts such as rolling pistons and crankshafts. In the hermetic rotary compressor, the hermetic rotary compressor is equipped with an oil supply pipe having one end opening below the surface of the lubricating oil stored at the bottom of the hermetic container and the other end opening into a low pressure space on the inner peripheral side of the rolling piston. A discharge muffler is positioned between the electric element and the compression element, and a disk for partitioning a space for accommodating each of the electric element and the compression element is integrally molded with the discharge muffler on the outer periphery of the discharge muffler. The discharge port of the discharge muffler is provided by molding, and the discharge port of the discharge muffler is provided facing the space on the electric element side, and the disc is provided with a communication part that communicates the space on the electric element side and the space on the compression element side, and the oil supply pipe is fixed to this disk.

[For production]

The compressed gas is received by the discharge muffler from the compression chamber in the cylinder via the discharge port, and then flows from the discharge port of the discharge muffler to the space on the electric element side. Thereafter, the fluid flows through the communication portion of the disc into the space on the compression element side, and is then discharged to the outside from the discharge pipe. Therefore, the pressure in the space on the electric element side can be increased and the pressure in the space on the compression element side can be lowered. Therefore, the level of the lubricating oil is lower in the space on the electric element side and higher in the space on the compression element side. In addition, since the disc partitions the space on the electric element side and the space on the compression element side, it exists in a wide part of the vertical section of the sealed container, so the oil supply pipe fixed to this disc is stable over its entire length. Fixation will take place.

【Example】

An embodiment of the present invention will be described below with reference to FIGS. 1 to 7. FIG. 1 shows a sectional view of a hermetic rotary compressor embodying the present invention. A discharge muffler 12 attached to the frame 2 and a disk 21 are integrally molded, and one end of the oil supply pipe 1 is attached to the frame 2 and the other end is fixed to the disk 21. As shown in FIGS. 2 to 4, the discharge muffler 12 has a substantially dish-like shape, and a disk 21 is present on the outer periphery of the discharge muffler 12. The discharge muffler 12 and the disc 21 are manufactured by integrally forming one disc-shaped sheet metal by pressure forming. A discharge port 22 is opened in the discharge muffler 12,
A communication portion 23 is formed in the disc 21 and includes a hole that communicates the electric element side and the compression element side. Also, the discharge muffler 1
A hole 24 through which the cylindrical frame 2 passes is provided in the center of the frame 2 . Note that this frame 2 is for receiving the crankshaft 7. The embodiment of the present invention is constructed as described above, and the disc 21 is provided with one (or more than one) hole 23, so that the refrigerant gas flows as shown by the arrow A in the figure, A pressure difference occurs between the element 4 side and the compression element 5 side, and the oil level of the lubricating oil 16 becomes higher on the compression element 5 side than on the electric element 4 side. As a result, the compression element 5 side, where the oil level is higher, can sufficiently supply lubricating oil 16 to the sliding parts when the vane 9 moves up and down, and the electric element 4 side, where the oil level is lower, can supply sufficient lubricating oil 16 to the sliding part when the vane 9 moves up and down. Sufficient oil supply from the oil supply pipe 1 to the sliding parts can be ensured as in the conventional case. Moreover, since the oil level has become lower, the lubricating oil 16 generated by the rotor 6 of the electric element 4
The amount of lubricating oil contained in the discharged refrigerant gas can be reduced. In addition, since the oil supply pipe 1 can be fixed with a part of the disk 21, the oil supply pipe 1 can be prevented from falling off due to vibrations during compressor operation.
There is no fear of bending and structural reliability can be ensured. In this embodiment, the method of fixing the disk 21 and the oil supply pipe 1 is as shown in FIGS. 5 to 7. That is, FIG. 5 shows the surfaces of the discharge muffler 12 and the disc 21 on the compression element 5 side, and the substantially middle part of the oil supply pipe 1 is near the square hole 26 formed in the disc 21 by the fixing fitting 25. Fixed. FIG. 6 shows the surface on the electric element 4 side, and shows the state in which the square hole 26 of the disc 21 and the fixing fitting 25 are engaged. That is, as explained in an enlarged view in FIG. The oil supply pipe 1 is fixed on the surface of the disc 21 by bending the inserted ends in opposite directions so that they do not come out of the square hole 26. FIGS. 8 and 9 show communication portions according to other embodiments of the present invention. In the embodiment described above, the communication section 23 between the electric element and the compression element divided by the disk 21 was formed with a penetrating hole, but in this embodiment, a communication section 27 formed by a notch was provided. It is. That is, the communicating portion 27 is formed by cutting out a portion of the upper portion of the disc 21. Note that the configuration other than the above is the same as the embodiment shown in FIG.

【Effect of the invention】

As described above, the present invention allows the lubricating oil level on the electric element side to be lowered and the lubricating oil level on the compression element side to be higher by the functions of the disk and the communication portion provided on the outer periphery of the discharge muffler. As a result, the vanes on the compression element side are sufficiently lubricated by the lubricating oil at the higher oil level, and the sliding parts of the crankshaft on the electric element side are supplied with lubricating oil through the oil supply pipe as before. can be sufficiently secured by By lowering the lubricating oil level on the electric element side, disturbance of the lubricating oil level due to the rotor of the electric element can be prevented, and the amount of lubricating oil contained in the discharged gas can be reduced. Further, by fixing the oil supply pipe to a disk existing on the outer periphery of the discharge muffler, stable fixation can be achieved over the entire length of the oil supply pipe. Therefore, it is possible to prevent the oil supply pipe from falling off or breaking due to vibrations during operation of the compressor. In addition, by integrally molding this disc with the discharge muffler,
There is almost no need to change the processing accuracy and strength of conventional discharge mufflers, etc.

[Brief Description of the Drawings] Figure 1 is a cross-sectional view of the hermetic compressor according to the present invention, Figure 2 is a cross-sectional view of the discharge muffler in Figure 1, and Figure 3 is a view of Figure 2 from the left side of the figure. 4 is a perspective view of FIG. 2 seen from the right side of the figure, FIG. 5 is a perspective view of FIG. 3 with the frame 2 and oil supply pipe 1 fixed, and FIG. 6 is a perspective view of FIG. Figure 7 is an enlarged view of the main parts of Figure 5, Figure 8 is a perspective view of a discharge muffler showing another embodiment, Figure 9 is the left side of Figure 8, as seen from the cloth. FIG. 10 is a sectional view of a conventional hermetic rotary compressor. 1 Oil supply pipe, 2 Frame, 3 Airtight container, 4 Electric element, 5 Compression element, 6 Rotor, 7 Crankshaft, 8 Rolling piston, 9 Vane, 10 Cylinder, 11 Compression chamber, 12...Discharge muffler, 13 Spring, 21 Disc, 25... Fixing fitting, 23,2
7 - Communication section. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] A roughly horizontal crankshaft, an electric element for rotating the crankshaft, and a compression element for compressing gas by rotation of the crankshaft are housed in a nearly cylindrical sealed container. The elements include a rolling piston provided on a crankshaft, a cylinder holding the rolling piston inside, and a vane that makes reciprocating contact with the rolling piston and partitions the inside of the cylinder to form a compression chamber. a discharge port provided in the cylinder or a frame supporting the cylinder to guide the compressed gas in the compression chamber; a generally dish-shaped discharge muffler that receives the compressed gas from the discharge port; and a discharge port of the discharge muffler that is connected to the sealed container. It consists of a discharge pipe installed in a sealed container for discharging the compressed gas that has flowed inside to the outside, and a discharge pipe provided at one end of the sealed container to supply lubricating oil to sliding parts such as rolling pistons and crankshafts. In a hermetic rotary compressor, the discharge muffler is connected to the electric element in a closed rotary compressor equipped with an oil supply pipe that opens below the surface of lubricating oil stored at the bottom and the other end opens into a low pressure space on the inner peripheral side of the rolling piston. and the compression element, and a disc for partitioning a space for accommodating each of the electric element and the compression element is provided on the outer periphery of the discharge muffler by integral molding with the discharge muffler, The discharge port of the discharge muffler is provided facing the space on the electric element side, the disc is provided with a communication portion that communicates the space on the electric element side and the space on the compression element side, and the oil supply pipe is connected to this disc. Fixed hermetic rotary compressor.