JPH02241997A - Rotary compressor - Google Patents

Abstract

PURPOSE:To prevent interference noise to be generated by a delivery gas and the oil in a delivery chamber to reduce noise during operation by forming an oil delivery path by means of a noise eliminating chamber cover, in which an oil drain hole is drilled, under a noise eliminating chamber and the secondary throttle section, connected to the oil drain hole, in the oil path cover. CONSTITUTION:The oil delivered from a cylinder through a delivery valve 8 enters the secondary throttle groove 19 in an oil path cover plate 17 from an oil drain hole 21 facing a delivery valve chamber 15, pushed by delivery gas pressure, and released out of the top of the groove 19. Since the groove 19 is a fine groove throttle, its function cannot be almost affected by the noise radiated from the delivery valve chamber 15. Even if the oil filled in the cylinder 3 when a rotary compressor is stopped or the oil circulating during operation is delivered, the oil will not remain in the delivery valve chamber 15 under a delivery noise-eliminating chamber 11. The oil is released rapidly through the oil drain hole 21 to the top of the groove 19 to prevent the oil from being remaining in the delivery valve chamber 15. Thus, interference noise to be generated by the delivery gas and the oil in the delivery valve chamber 15 can be prevented, and a quiet rotary compressor can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary compressor, such as an air conditioner,
The present invention relates to a rotary compressor that is used in refrigeration and air conditioning equipment such as refrigerators, and is particularly suitable for reducing operating noise.

[Prior Art] A conventional rotary compressor will be described with reference to FIGS. 8 and 9.

FIG. 8 is a longitudinal sectional view of a conventional rotary compressor, and FIG. 9 is a perspective view of a conventional silencing chamber cover plate.

In a conventional rotary compressor, as shown in FIGS. 8 and 9, a crankshaft 2 connected to a rotor 1a constituting an electric motor section is supported by a main bearing 4 and a sub-bearing 5 that seal both ends of a cylinder 3. Then, the vane 6 that partitions the inside of the cylinder 3 into a compression chamber and a suction chamber is brought into contact with a roller 7 associated with a rolling piston fitted into the crankshaft 2, and the roller 7 is rotated eccentrically, and the vane 6 follows this rotation. The compression mechanism section is configured such that it reciprocates and performs a compression action.

The compressed gas is discharged by pushing open the discharge valve 8, and is muffled in the discharge muffler chamber 11 covered with the sub-bearing 5 having ribs 9 on the outer periphery and the temporary muffler cover 10A.

A discharge valve chamber 15 that accommodates the discharge valve 8 is formed in the lower part of the discharge silencing chamber 11 .

Regarding oil supply to the lubricating section, the oil stored in the lower part of the case is pushed out from the pump chamber 12 configured at the back of the vane 6 by the reciprocating movement of the vane 6, and is pushed out from the pump chamber 12 configured at the back of the vane 6, and is then pumped out from the silencing chamber cover plate 10A and the oil supply path cover plate 13. The oil is supplied to the crankshaft 2 from an oil supply path 14 formed by the above.

In addition, related to this type of rotary compressor are:
For example, a technique described in Japanese Unexamined Patent Publication No. 63-230974 is known.

[Problems to be Solved by the Invention] In the above-mentioned conventional technology, lubricating oil enters into the cylinder 3 while the compressor is stopped, and the cylinder 3 is filled with oil. Therefore, oil is ejected into the discharge silencing chamber 11 at the time of startup and remains in the discharge valve chamber 15 formed at the lower end of the discharge silencing chamber 11. When oil accumulates in the discharge valve chamber 15, an oil tapping sound is generated from the discharge valve 8. Therefore, consideration has been given to the fact that if a hole is made in the muffling chamber cover plate 10A in order to make it easier for the oil to drain out of the discharge valve chamber 15, the sound of the discharged gas during steady operation will be radiated and generate even louder noise. It wasn't.

The present invention has been made to solve the problems in the prior art described above, and by preventing the accumulation of oil in the discharge valve chamber, interference noise generated by the discharge gas and the oil in the discharge chamber is prevented. The objective is to provide a quiet rotary compressor with reduced operating noise.

[Means for Solving the Problems] In order to achieve the above object, the most basic structure of the rotary compressor according to the present invention includes an electric motor section and a crankshaft connected to the electric motor section in a closed container. The compression mechanism includes a cylinder, a rolling piston that rotates eccentrically within the cylinder, a vane that reciprocates following the rotation of the rolling piston, and seals both ends of the cylinder. In a rotary compressor comprising a main bearing and a sub-bearing that support the crankshaft, and a discharge valve chamber formed in the sub-bearing, the sub-bearing is configured to form a silencing chamber on an end surface opposite to the cylinder. A silencing chamber cover is provided in the silencing chamber cover, and an oil supply hole for supplying oil to a lubricating part and an oil drain hole for discharging oil in the silencing chamber are bored in the silencing chamber cover, and an oil supply passage cover is fixed to the silencing chamber cover. The oil supply passage cover includes a first constriction portion forming an oil supply passage so as to cover the oil supply hole of the silencing chamber cover, and a first constriction portion formed to cover the oil drain hole of the silencing chamber cover. .

A second constriction part is provided with one end open to form an oil discharge passage.

[Effect] The working of the above technical means is as follows.

An oil discharge passage is formed in the vicinity of the discharge valve chamber at the bottom of the silencer chamber by the silencer cover having an oil drain hole drilled therein, and the second constricted portion of the oil supply passage cover that communicates with the oil drain hole. Oil discharged from the cylinder during startup or steady operation of the compressor is discharged without accumulating in the discharge valve chamber.

This makes it possible to prevent the oil-slapping sound (interference sound) of the discharged gas caused by discharging the discharged gas into oil.

[Embodiments] Hereinafter, each embodiment of the present invention will be described with reference to FIGS. 1 to 7. Note that in these figures, the same reference numerals as in FIGS. 8 and 9 above indicate parts equivalent to those of the prior art.

1 is a longitudinal cross-sectional view of a rotary compressor according to an embodiment of the present invention, FIG. 2 is an exploded perspective view showing the end face of the sub-bearing shown in FIG. 1, and FIG. 3 is a silencing chamber shown in FIG. 1. Exploded perspective view of the cover plate,
4 is an exploded perspective view of the oil supply passage cover plate of FIG. 1. FIG.

The rotary compressor shown in FIG. 1 includes an electric motor section consisting of a rotor 1a and a stator 1b, and a compression mechanism section connected to the electric motor section by a crankshaft 2, in a case 16 that is a closed container. This is a horizontal hermetic conduction compressor with lubricating oil sealed in the lower part.

The compression mechanism includes a cylinder 3, a roller 7 associated with a rolling piston that rotates eccentrically within the cylinder 3, and a vane that reciprocates following the eccentric rotation of the roller 7 and partitions the interior of the cylinder 3 into a compression chamber and a suction chamber. 6, a main bearing 4 and a sub-bearing 5 that seal both ends of the cylinder 3 and support the crankshaft 2, a discharge valve chamber 15 formed in the sub-bearing 5, and an oil supply provided at the back of the vane 6. The main component is a pump chamber 12.

The auxiliary bearing 5 has a rib 9 on its outer periphery, and as shown in FIG. 2, its end surface opposite to the cylinder is formed to mount a silencing chamber cover plate 1o shown in FIG. 3. That is, by attaching the muffling chamber cover plate 10 to the end surface opposite to the cylinder of the sub-bearing 5 by tightening bolts or the like, a discharge muffling chamber 11 is formed, and a discharge valve chamber 15 communicating with the discharge valve 8 is provided at the lower part of the discharge muffling chamber 11. is provided.

The silencing chamber cover plate 10 is provided with oil supply holes 201-1 and 20-2 for supplying oil to the lubricating section. Oil supply hole 2o
-1 is bored at a position that communicates with the oil supply pump chamber 12 in the lower part of the cylinder 3 (back of the vane 6) via the oil supply hole 5a of the sub bearing 5, and the sub oil supply hole 20-2 is A hole is bored at a position communicating with the two shaft ends of the crankshaft supported by the bearing 5.

The silencing chamber cover plate 10 also has an oil drain hole 21 at a position corresponding to the vicinity of the lower end wall surface of the discharge valve chamber 15 provided in the sub-bearing 5.
is perforated.

Reference numeral 17 in FIGS. 1 and 4 is an oil supply passage cover plate related to the oil supply passage cover, which is fixed to the silencing chamber cover plate 10 by welding or the like.

Reference numeral 18 denotes a first throttle groove related to the throttle part formed in the oil supply passage cover plate 17, and this first throttle groove 18 covers the oil supply holes 20-1 and 20-2 of the silencing chamber cover plate 10. The oil supply passage is located in the same position and has both upper and lower ends closed to form an oil supply passage.

Reference numeral 19 denotes a second throttle groove related to the throttle part formed in the oil supply passage cover plate 17. This second throttle groove 19 is located at a position covering the oil drain hole 21 of the silencing chamber cover plate 10, The oil discharge passage is formed by opening the lower part and closing the lower part.

The operation of such a configuration will be described next.

When the rotary compressor is driven, the roller 7 rotates eccentrically within the cylinder 3 as the crankshaft 2 rotates.
The vane 6 reciprocates to perform a compression action.

Due to the reciprocating movement of the vane 6, oil pushed out from the pump chamber 12 is transferred to the oil supply hole 5a of the sub-bearing, the oil supply hole 20-1 of the muffling chamber cover plate 10. First throttle groove 1 of oil supply passage cover plate 17
8, oil is supplied to the shaft end of the crankshaft 2 from the oil supply hole 20-2 of the muffling chamber cover plate 10.

On the other hand, the oil discharged from the cylinder via the discharge valve 8 is
The oil enters the second throttle groove 19 of the oil supply passage cover plate 10 through the oil drain hole 21 facing the discharge valve chamber 15, is pushed out by the discharge gas pressure, and is discharged from above the second throttle groove 19.

Since the second throttle groove 19 is a narrow groove throttle, there is almost no influence of noise radiated from the discharge valve chamber 15.

In the rotary compressor of this embodiment, even if the oil filled in the cylinder 3 is discharged when stopped, or even if the circulating oil is discharged during operation, the discharge valve chamber 15 below the discharge muffling chamber 11 This prevents oil from remaining in the discharge valve chamber 15 and is promptly discharged from the oil drain hole 21 from above the second throttle groove 19 of the oil supply path cover plate 17, thereby preventing oil from remaining in the discharge valve chamber 15.

Therefore, since interference noise generated by the discharged gas and the oil in the discharge valve chamber 15 is prevented, it is possible to provide a quiet rotary compressor.

FIG. 5 is a perspective view of an oil supply passage cover plate according to another embodiment of the present invention. In the figure, parts with the same reference numerals as those in FIG. 4 are the same parts as those in the previous embodiment, so a description thereof will be omitted.

Further, the configuration of each part of the rotary compressor to which the embodiment of FIG. 5 is applied is the same as that shown in FIGS. 1 to 3.

In the oil supply passage cover plate 17A shown in FIG. 5, the second throttle groove 19A is curved to form the oil discharge port 19a in a generally horizontal direction. The second throttle groove 19A is the oil drain hole 2
1 is formed so as to cover the same as in the previous embodiment.

According to the embodiment shown in FIG. 5, the same effects as in the previous embodiment are expected, and since the jetted oil comes out laterally, the oil adhering to the sound deadening cover plate 10 flows back into the second throttle groove 19A. This embodiment has an advantage in that the oil in the discharge valve chamber 15 can be more reliably discharged without any problem.

FIG. 6 is a perspective view of a silencing chamber cover plate according to still another embodiment of the present invention. In the drawings, parts with the same reference numerals as those in Figs. 3, 4, and 5 are the same parts as in each of the previous embodiments, so a description thereof will be omitted. Further, the configuration of each part of the rotary compressor to which the embodiment of FIG. 6 is applied is the same as that shown in FIGS. 1 and 2.

The silencing chamber cover plate 1o shown in FIG.
The oil supply passage cover plate 17-1 formed with a curved second restricting groove 19B having an oil discharge port 19a in the horizontal direction, and the oil discharge passage cover plate 17-2 formed with a curved second throttle groove 19B having an oil discharge port 19a in the horizontal direction 10.

The fact that the first throttle groove 18 is formed to cover the oil supply hole 20-1, 20-2, and the second throttle groove 19B is formed to cover the oil drain hole 21 is the same as in each of the previous embodiments. It is similar to

According to the embodiment shown in FIG. 6, the same effects as those of the previous embodiments are expected, and in addition, the connection between the oil supply passage cover plate 17-1 or the oil discharge passage cover plate 17-2 and the silencing chamber cover plate 10 is This embodiment has an effect that the oil supply passage and the oil discharge passage can be prevented from communicating with each other.

Next, FIG. 7 is a perspective view of a silencing chamber cover plate according to still another embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 6 are the same parts as in the previous embodiment, so the explanation thereof will be omitted. Further, the configuration of each part of the rotary compressor to which the embodiment of FIG. 7 is applied is equivalent to that shown in FIGS. 1 and 2.

In the embodiment shown in FIG. 7, instead of the second throttle groove in each of the previous embodiments, a pipe 22 is connected to the oil drain hole 21 of the silencing chamber cover plate 1o and has the other end open to form an oil discharge path. is fixed to the sound deadening chamber cover plate 10. pipe 2
2 is curved so that the oil discharge port 22a is directed horizontally.

According to the embodiment shown in FIG. 7, the same effects as those of the previous embodiments can be expected, and there is also an effect unique to this embodiment in that communication between the oil supply path and the oil discharge path can be reliably prevented.

It goes without saying that the rotary compressor described in each of the above embodiments is used, for example, in refrigeration and air conditioning equipment such as air conditioners and refrigerators, and can reduce the operating noise of these equipment.

[Effect of the invention] As described in detail above, according to the present invention.

By preventing oil from stagnation in the discharge valve chamber, interference noise generated by discharge gas and oil in the discharge valve chamber is prevented, and a quiet rotary compressor with reduced operating noise can be provided.

[Brief explanation of drawings]

1 is a longitudinal cross-sectional view of a rotary compressor according to an embodiment of the present invention, FIG. 2 is an exploded perspective view showing the end face of the sub-bearing shown in FIG. 1, and FIG. 3 is a silencing chamber shown in FIG. 1. Exploded perspective view of the cover plate,
Figure 4 is an exploded perspective view of the oil supply channel cover plate in Figure 1;
6 is a perspective view of a silencing chamber cover plate according to still another embodiment of the present invention; FIG. 7 is a perspective view of a silencing chamber cover plate according to another embodiment of the present invention; FIG. FIG. 8 is a longitudinal sectional view of a conventional rotary compressor, and FIG. 9 is a perspective view of a conventional silencing chamber cover plate according to still another embodiment. 1a...Rotor, 1b...Stator, 2...Crankshaft, 3...Cylinder, 4...Main bearing, 5...
... Secondary bearing 6... Vane, 7... Roller, 8... Discharge valve, 10, 10A... Sound deadening plate cover plate, 11...
Discharge muffling chamber, 15...Discharge valve chamber, 16...Case,
17... Oil supply path cover plate, 18... First throttle groove,
19.19A, 19B...Second aperture groove, 20-1.2
0-2... Oil supply hole, 21... Oil drain hole, 22...
Pipe, 19a, 22a... oil discharge port.

Claims (1)

[Claims] 1. An electric motor section and a compression mechanism section connected to the electric motor section by a crankshaft are housed in a closed container, and the compression mechanism section rotates eccentrically within the cylinder. A rolling piston, a vane that reciprocates following the rotation of the rolling piston, a main bearing and a sub-bearing that seal both ends of the cylinder and support the crankshaft, and a discharge valve chamber formed in the sub-bearing. In the rotary compressor, the auxiliary bearing is provided with a silencing chamber cover on the opposite end face of the cylinder to form a silencing chamber, and the silencing chamber cover has an oil supply hole for supplying oil to the lubricating section, and the silencing chamber cover. An oil drain hole for discharging oil in the room is bored, and an oil supply path cover is fixed to the sound deadening chamber cover,
The oil supply passage cover includes: a first constriction portion forming an oil supply passage so as to cover the oil supply hole of the silencing chamber cover; and a first constriction portion formed to cover the oil drain hole of the silencing chamber cover;
A rotary compressor characterized in that it is provided with a second throttle part having one end open to form an oil discharge passage. 2. The rotary compressor according to claim 1, wherein the oil drain hole drilled in the silencing chamber cover is located near the lower end wall surface of the discharge valve chamber provided in the sub-bearing. 3. The rotary compressor according to claim 1, wherein the oil supply passage cover is provided with a first constricted portion having both upper and lower ends closed, and a second constricted portion having an open upper portion and a closed lower portion. 4. The oil supply channel cover is provided with a first constriction part that closes both upper and lower ends, and a second constriction part that closes the lower part and has an oil discharge port opened in the horizontal direction by curving the constriction part. The rotary compressor according to claim 1, characterized in that: 5. The silencing chamber cover has an oil supply passage cover forming a first constricted portion with both ends closed, and an oil discharge passage cover forming a second constricted portion with one end open, each fixed to the silencing chamber cover. The rotary compressor according to claim 1, characterized in that: 6. In a sealed container, house an electric motor section and a compression mechanism section connected to the electric motor section by a crankshaft, and the compression mechanism section includes a cylinder, a rolling piston that eccentrically rotates inside the cylinder, and a rolling piston that rotates eccentrically within the cylinder. A rotary rotary comprising a vane that reciprocates following the rotation of a piston, a main bearing and a sub-bearing that seal both ends of the cylinder and support the crankshaft, and a discharge valve chamber formed in the sub-bearing. In the compressor, the auxiliary bearing is provided with a silencing chamber cover on the opposite end face of the cylinder to form a silencing chamber, and the silencing chamber cover has an oil supply hole for supplying oil to a lubricating section and a discharge hole for discharging oil in the silencing chamber. an oil supply passage cover having a constricted portion that forms an oil supply passage so as to cover the oil supply hole of the sound deadening chamber cover; A rotary compressor, characterized in that a pipe line having an open end to form an oil discharge passage is fixed to the muffling chamber cover.