JPH0472074B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to an improvement in a hermetic compressor that reduces the discharge amount of oil contained in refrigerant compressed by a rotary compression element and discharged.

(b) Conventional technology A conventional hermetic compressor is, for example,
The structure is as shown in the publication. Here, a conventional example will be explained with reference to this publication. Third
In the figure, 50 is a closed container, inside this container there is an electric element 51 on the upper side and a rotary compression element 52 on the lower side.
are stored respectively. The electric element 51 includes a stator 54 having an oil return hole 53 on the outer periphery, and a rotating shaft 56 via an air gap 55 inside the stator.
The rotor 57 is inserted into the rotor 57. A balancer 58 is attached to the rotor 57. The rotary compression element 52 includes a cylinder 59, a roller 61 that rotates inside the cylinder 59 by an eccentric portion 60 of the rotating shaft 56, a vane 62 that comes into contact with the roller and divides the inside of the cylinder 59, and a top that closes the opening of the cylinder 59. It is composed of a bearing part 63 and a lower bearing part 64. 65 and 66 are discharge ports provided in the upper bearing part 63 and the lower bearing part 64, respectively, and these discharge ports are opened and closed by independent discharge valves 67 and 68, respectively. Numerals 69 and 70 are cup mufflers that cover the discharge valves 67 and 68, and these cup mufflers are attached to the upper bearing part 63 and the lower bearing part 64, respectively. Reference numeral 71 denotes a passage provided in the cylinder 59, and this passage communicates within both cup mufflers 69 and 70. Reference numeral 72 denotes an auxiliary cooler provided outside the hermetic container 50, and this auxiliary cooler connects the passage 72, the electric element 51 and the rotary compression element 52 inside the hermetic container 50.
and a space 73 between the two. 74 is a discharge pipe, and this discharge pipe is attached to the upper wall of the closed container 50.

In the hermetic compressor of this structure, the refrigerant compressed in the cylinder 59 is discharged into the cup mufflers 69, 70 from the discharge ports 65, 66 provided in the upper bearing part 63 and the lower bearing part 64. 6
The area of the passages 5 and 66 is increased so that these discharge ports do not act as resistance to the compressed refrigerant.

(c) Problems to be solved by the invention However, the upper and lower cup mufflers 65, 6
The refrigerant discharged into the airtight container 6 flows from the auxiliary cooler 72 into the space 73 inside the closed container 50 through the passage 71. Therefore, the refrigerant flowing laterally into this space is concentrated in a part of the air gap 55 near the outlet of the auxiliary cooler 72, and since no more than a certain amount of refrigerant flows in this concentrated air gap, as a result, the air gap 55 is The amount of refrigerant flowing decreases, and the refrigerant that cannot pass through the air gap 55 flows into the stator 54.
There is a problem in that the oil that flows upward through the oil return hole 53 and is separated at the top of the electric element 51 does not return to the bottom of the closed container 50.

In order to solve the above-mentioned problem, this invention allows the refrigerant discharged into the cup mufflers attached to the upper bearing part and the lower bearing part to be discharged from a plurality of discharge ports provided in the cup muffler of the upper bearing part. The purpose of this is to discharge the refrigerant almost uniformly so that the refrigerant flows uniformly into the air gap.

(d) Means for Solving the Problems This invention provides a method in which cup mufflers are respectively attached to an upper bearing portion and a lower bearing portion, and a plurality of discharge ports are provided in the cup muffler attached to the upper bearing portion, and,
The cylinder is provided with a plurality of passages communicating between the upper and lower cup mufflers, and the sizes of the discharge ports and the passages are determined by the ratio of the passage resistance in the cup muffler from the discharge port to these discharge ports or the entrances of the passages. The cross-sectional area is the same ratio.

(E) Effect This invention is configured as described above, so that
The refrigerant is discharged into the upper and lower cup mufflers from the discharge ports provided in the upper and lower bearing parts, respectively.
The refrigerant is discharged almost evenly from the plurality of discharge ports of the cup muffler attached to the upper bearing part, so that the refrigerant flows evenly around the entire circumference of the air gap of the electric element, and the refrigerant discharged from the discharge ports is distributed to the stator. This prevents the oil from flowing into the oil return hole provided on the outer periphery.

(f) Embodiments The present invention will be explained below based on embodiments shown in FIGS. 1 and 2.

Reference numeral 1 denotes a closed container having an oil reservoir 2 in which oil is stored at the bottom. Inside this container, an electric element 3 is placed on the upper side, and a rotary compression element 5 that is driven by a rotating shaft 4 of this electric element is placed on the lower side. are stored respectively. The electric element 3 has an oil return hole 6 on the outer periphery,
It is composed of a stator 8 having a built-in winding 7, and a rotor 10 inserted into the rotating shaft 4 through an air gap 9 inside the stator. The winding 7 is provided with a coil end 13 that projects into the upper space 11 and lower space 12 of the electric element 3. Rotor 1
A balancer 14 located inside the coil end 13 is provided at the upper and lower ends of the coil end 13. The rotary compression element 5 includes a cylinder 15 and a roller 17 that rotates within the cylinder 15 by an eccentric portion 16 of the rotating shaft 4.
It is composed of an upper bearing part 18 and a lower bearing part 19 that close the opening of the cylinder 15. Reference numerals 20 and 21 indicate discharge ports provided in the upper bearing portion 18 and the lower bearing portion 19, respectively, and these discharge ports are opened and closed by independent discharge valves 22 and 23, respectively. 24 and 25 are cup mufflers that cover the discharge valves 22 and 23, and this cup muffler has two facing recesses 26 and 26 for attaching bolts, dividing the muffler part into two parts, and an upper bearing part. 18 and the lower bearing part 19. The muffler section divided into two parts has a throttle passage 2 formed by seat depressions 26, 26.
7 and 27 are connected. On the upper surface of the cup muffler 24 attached to the upper bearing part 18, there are two discharge ports 28, 2 which face the air gap 9 of the electric element 3 and open into the two muffler parts, respectively.
9 is provided. This discharge port is located at the upper bearing portion 18.
The area of the passage closer to the discharge port 20 is made smaller than the area of the passage farther away. Discharge port 28,2
The size of 9 is made to have a cross-sectional area that is the same as the ratio of the passage resistance from the discharge port 20 to these discharge ports. The cylinder 15 has cup mufflers 24 and 25.
Two passages 30 and 31 are provided that communicate with each other. These two passages communicate with separate muffler sections. The passages 30 and 31 have a passage area closer to the discharge port 21 of the lower bearing portion 19 smaller than a passage area farther from the discharge port 21. The passages 30, 31 are sized to have a cross-sectional area that is the same as the ratio of the passage resistances from the discharge port 21 to the inlets of these passages. 32 is a discharge pipe, and this discharge pipe is attached to the upper wall of the closed container 1.

In the hermetic compressor configured in this way,
The refrigerant that has flowed into the cylinder 15 is compressed by the roller 17 and discharged from the discharge ports 20 and 21 through the discharge valve 2.
2, 23 are opened and the respective cup mufflers 24,
25. The refrigerant in the cup muffler 24 of the upper bearing part 18 is discharged through two discharge ports 28,
The refrigerant in the cup muffler 25 of the lower bearing part 19 is discharged from the cup muffler 29 into the lower space 12 in the closed container 1, and the refrigerant flows from the cup muffler into two passages 30, 3.
1 and from the discharge ports 28 and 29 of the cup muffler 24 of the upper bearing part 18 to the lower space 12 in the closed container 1.
is discharged. The refrigerant discharged into this space passes through the air gap 9 of the electric element 3 and is discharged into the upper space 11. The refrigerant discharged into the upper space is swirled by the rotor 10, and the oil, which has a higher specific gravity than the gas refrigerant contained therein, is blown off to the stator 8 by centrifugal force and separated. The refrigerant from which the oil has been separated is discharged from the discharge pipe 32 to the outside of the closed container 1. Further, the separated oil is returned to the oil reservoir 2 through the oil return hole 6 on the outer periphery of the stator 8.

The discharge ports 28 and 29 of the cup muffler 24 have a small passage area near the discharge port 20 of the upper bearing part 18 and a large passage area far from the discharge port 20 of the upper bearing part 18 to reduce the passage resistance from this discharge port to these discharge ports. By setting the cross-sectional area to the same ratio as the ratio, the refrigerant can be uniformly discharged from the discharge port 20.

The passages 30 and 31 of the cylinder 15 are connected to the lower bearing part 19.
By making the passage area closer to the discharge port 21 smaller and the passage area farther from it larger, the cross-sectional area is made equal to the ratio of the passage resistance from this discharge port to these discharge ports. 21
This allows the refrigerant to flow evenly. In addition, the two passages 30 and 31 are connected to the cup muffler 24.
The refrigerant flowing through this passage is discharged from discharge ports 28 and 29 that are open to the respective muffler parts. Therefore, the refrigerant discharged into the cup muffler 25 of the lower bearing part 19 is transferred to the upper bearing part 1.
It is evenly discharged from the cup muffler 24 of No. 8.

The discharge ports 28 and 29, which discharge the refrigerant evenly, are provided substantially symmetrically to face the air gap 9 of the electric element 3, so that the refrigerant discharged from the discharge ports passes through the air gap 9 uniformly.

This invention allows the refrigerant discharged from the discharge ports 28 and 29 to flow uniformly into the air gap 9, and makes it difficult for the refrigerant discharged from the discharge ports to flow into the oil return hole 6 on the outer periphery of the stator 8. 11
By returning the separated oil to the oil reservoir 2 through the oil return hole 6, the amount of oil discharged from the discharge pipe 32 together with the refrigerant is reduced.

(G) Effects of the Invention The hermetic compressor of the present invention has a cup muffler attached to each of an upper bearing portion and a lower bearing portion, and a plurality of discharge ports are provided in the cup muffler attached to the upper bearing portion, and The cylinder is provided with a plurality of passages communicating between the upper and lower cup mufflers, and the sizes of the discharge ports and the passages are determined by the ratio of the passage resistance in the cup muffler from the discharge port to these discharge ports or the entrances of the passages. Since the cross-sectional area has the same ratio so that the refrigerant flows evenly through multiple discharge ports or multiple passages, the refrigerant discharged from the discharge ports into the sealed container can flow uniformly into the air gap. Unlike conventional methods, the refrigerant concentrates in a part of the air gap, reducing the amount of refrigerant flowing through this air gap, and the oil that flows into the oil return hole and is separated above cannot return, increasing the amount of oil discharged. can be prevented.

[Brief explanation of the drawing]

Figures 1 and 2 show the present invention, Figure 1 is a longitudinal sectional view of a rotary compressor, Figure 2 is a plan sectional view showing the state in which a cup muffler is attached to the upper bearing, and Figure 3 is a conventional FIG. 2 is a longitudinal cross-sectional view of an example rotary compressor. DESCRIPTION OF SYMBOLS 1... Airtight container, 3... Electric element, 5... Rotating compression element, 8... Stator, 9... Air gap,
10... Rotor, 15... Cylinder, 18... Upper bearing section, 19... Lower bearing section, 20, 21... Discharge port, 22, 23... Discharge valve, 24, 25...
Cup muffler, 28, 29...Discharge port, 30,
31...Aisle.

Claims (1)

[Claims] 1. An electric element and a rotary compression element driven by the electric element are housed in a closed container, and the electric element is composed of a stator and a rotor with an air gap formed therebetween, and The compression element is a cylinder, an upper bearing portion and a lower bearing portion that seal the opening of the cylinder, a discharge valve that opens and closes a discharge port provided in each of these bearing portions, and an upper bearing portion and a lower bearing portion that cover the discharge valve. The cup muffler attached to the upper bearing part is provided with a plurality of discharge ports facing the air gap of the electric element, and each cylinder is provided with a plurality of discharge ports facing the air gap of the electric element. In a hermetic compressor in which a plurality of passages are provided that communicate within the cup muffler, the size of the discharge port is the same as the ratio of the passage resistance in the cup muffler from the discharge port to these discharge ports. What is claimed is: 1. A hermetic compressor, characterized in that the cross-sectional area of the passages is the same as the ratio of the passage resistance in the cup muffler from the discharge port to the entrance of these passages.