JPH11132177A - Rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide omission of any muffler cover and prevent lubricating oil from being fed into a cylinder. SOLUTION: This compressor has a structure where cylinders 15, 17 and thin plate shaped port plates 23, 27 provided with delivering ports 25, 29 which deliver refrigerant compressed by the cylinders 15, 17 are provided between a first bearing member 19 and a second bearing member 21 arranged in a sealed case 1. On the bearing member 19 side, a four-side surrounded delivering space 31 communicating with the delivering port 25 which performs delivery into the sealed case 1 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor.

[0002]

2. Description of the Related Art Generally, in a rotary compressor, an independent first cylinder and a second cylinder are disposed between an upper bearing member and a lower bearing member disposed in a sealed case.
The refrigerant compressed by the first cylinder is discharged into the closed case via a discharge passage provided in the upper bearing member.

On the other hand, the refrigerant compressed by the second cylinder joins the upper refrigerant through a communication passage from a discharge passage provided in the lower bearing member, and is then discharged into the closed case. It has become.

[0004]

The discharge passage provided in the bearing member has a shape which also serves as a discharge port of the cylinder, and has a structure penetrating vertically through the bearing member.

Therefore, the discharge passage provided in the upper bearing member opens upward, and the discharge passage provided in the lower bearing member opens downward.

However, since the sealed case is filled with the lubricating oil to a certain level, especially in the discharge passage directed downward, it is not desirable in terms of performance if the oil is directly discharged into the lubricating oil. In order to prevent this, it is necessary to separately provide a muffler cover for covering the discharge passage so that the lubricating oil does not flow into the cylinder via the discharge passage, which is not desirable in terms of assembly and cost.

Accordingly, an object of the present invention is to provide a rotary compressor which prevents the flow of lubricating oil and achieves a reliable noise reduction effect despite the omission of the muffler cover.

[0008]

In order to achieve the above object, the present invention provides a rotary compressor having a thin plate port plate having a discharge port for discharging a refrigerant compressed by a cylinder. A recessed discharge space communicating with the discharge port and covering the discharge port outlet side is formed in the bearing member.

In a preferred embodiment, the discharge space also serves as a muffler chamber having a predetermined size.

Alternatively, the discharge space communicates with a muffler chamber provided in a bearing member separately from the discharge space.

Alternatively, the discharge space communicates with at least a muffler chamber provided in the cylinder.

According to such a rotary compressor, the refrigerant compressed by the cylinder is once discharged into the discharge space from the discharge port of the port plate and then discharged into the closed case. Since the discharge space is formed in the bearing member, efficient discharge is possible without directly discharging the refrigerant to the lubricating oil.

According to the present invention, at least a lower side of a rotary compressor having a thin plate plate having a discharge port for discharging refrigerant compressed by the first cylinder and the second cylinder. A recessed discharge space communicating with the discharge port and covering the discharge port outlet side is formed in the bearing member.

Thus, the refrigerant discharged downward is once discharged into the discharge space and then discharged into the closed case. Since the discharge space is formed at least in the lower bearing member, the refrigerant is not discharged directly into the lubricating oil, and efficient discharge is possible. Moreover, a muffler cover is not required.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a sealed case of a rotary compressor 3 of a twin type. An electric mechanism 5 and a compression mechanism 7 are provided in the closed case 1 and are filled with the lubricating oil OL to a certain level.

The electric mechanism 5 comprises a stator 9 fixed to the inside of the sealed case 1 and a rotor 13 fixed to the shaft 11. When the stator 9 is energized, the shaft 11 is The rotation power is given to the.

The compression mechanism 7 comprises a first cylinder 15 and a second cylinder 17 through which the shaft 11 passes. The first and second cylinders 15 and 17 are separated from each other so as to be independent from each other. 19, and is fixed to the inner wall surface of the closed case 1.

The shaft 11 is rotatably supported at both ends by a first bearing member 20 on the upper side and a second bearing member 21 on the lower side. Between the first bearing member 20 and the first cylinder 15, a port plate 23 formed of a thin plate is disposed, and the port plate 23 is provided with a discharge port 25.

Second bearing member 21 and second cylinder 17
A port plate 27 formed of a thin plate is arranged between the port plate 27 and the discharge port 29.

The first bearing member 20 has a downwardly concave recessed discharge space 31 and has a predetermined area to also serve as a muffler chamber.

The discharge space 31 is provided with the port plate 23.
A discharge port 37 that communicates with the discharge port 25 and discharges into the sealed case 1 is provided on the upper side of the first bearing member 20. The refrigerant discharged into the closed case 1
The air is discharged to the outside via a discharge pipe 38 provided at the upper part of the closed case 1.

The discharge port 25 communicating with the discharge space 31 is controlled to be openable and closable by a discharge valve 39 opened by a discharge pressure. In addition, the movement of the discharge valve 39 to be opened by a certain amount or more by the valve stopper 41 is regulated.

The second bearing member 21 has a discharge space 43 in the shape of an upward concave portion, and has a predetermined size so as to also serve as a muffler chamber.

The lower discharge space 43 communicates with the discharge port 29 of the lower port plate 27, and via a communication passage 55 passing through the first and second cylinders 15, 17 and the partition plate 19. To the discharge space 31 on the first bearing member 20 side.

The discharge port 29 communicating with the lower discharge space 43 is controlled to be openable and closable by a discharge valve 57 which is opened by the discharge pressure. The movement of the discharge valve 57 to be opened by a certain amount or more by the valve stopper 59 is restricted.

The first and second cylinders 15 and 17 are formed to have substantially the same thickness, and are provided with mounting bolts 61 penetrating the first bearing member 20 and the second bearing member 21 with the partition plate 19 interposed therebetween. It is bolted together.

In the area of the shaft 11 penetrating the compression mechanism 7, the eccentric shaft 6, which is 180 ° out of phase with the first and second cylinders 15 and 17,
3, 65 are provided. In the eccentric shaft portions 63 and 65,
The first roller 67 and the second roller 69 disposed in the first and second cylinders 15 and 17
7, 69 are turned by the rotation of the respective eccentric shaft portions 63, 65.

The first and second cylinders 15 and 17 are provided with a roller (not shown) which is in constant contact with the rollers 67 and 69 and an outer peripheral surface of the rollers 67 and 69 by a biasing means such as a spring. Is provided. The first and second cylinders 15 and 17 have compression chambers 75 and 75 formed by rollers 67 and 69 and blades, respectively.
The working gas sucked from the suction port 73 through the first port 1 is compressed in the compression chambers 75, 75.

Each of the compression chambers 75, 75 of the first and second cylinders 15, 17 is provided with the port plate 2 described above.
Each of the discharge ports 25 and 29 is in communication with each of the discharge ports 25 and 29.

In the rotary compressor configured as described above, the first cylinder 15 has a suction pipe 7
The refrigerant sent from 1 is compressed in the compression chamber 75 and then discharged into the closed case 1 through the discharge port 25, the discharge space 31, and the discharge port 37.

On the other hand, in the second cylinder 17, the refrigerant sent from the suction pipe 71 is compressed in the compression chamber 75, and then discharged into the discharge port 29, the discharge space 43, and the communication passage 55.
Through the first cylinder 15 in the upper discharge space 31.
From the discharge port 37 to be discharged into the closed case 1. During this operation,
The noise due to the discharged refrigerant is suppressed in the discharge spaces 31 and 43. In this case, as shown by a two-dot chain line in the figure,
By providing the muffler 77, a better silencing effect can be obtained.

Further, the refrigerant discharged from the second cylinder 17 is not directly discharged into the lubricating oil OL without the muffler cover, and an efficient discharge state is ensured. There is no inconvenience flowing into the cylinders 15 and 17.

In the first embodiment, the discharge space 31 of the first bearing member 20 also serves as a muffler chamber.
The muffler chamber 33 is formed separately in the first bearing member 20 as shown in FIG. 3 without making the discharge space 31 also serve as the muffler chamber, and the muffler chamber 33 and the discharge space 31 pass through the passage 35. Is also good.

Similarly, the discharge space 43 is not structured to also serve as a muffler chamber, and as shown in FIG.
Alternatively, a muffler chamber 45 may be separately formed, and the muffler chamber 45 and the discharge space 43 may be communicated with each other through the passage 47.

Further, as shown in FIG. 5 and FIG.
It is also possible to form a muffler chamber 49 that penetrates through the second cylinders 15 and 17 and the partition plate 19, respectively, and communicates the muffler chamber 49 with the discharge spaces 31 and 43 through the passages 50 and 51. In this case, the refrigerant gas compressed in each cylinder is discharged into the closed case 1 after passing through the common muffler chamber 49.

Next, a second embodiment of the present invention will be described.

As shown in FIG. 7, the first bearing member 20 on the upper side has a structure using the muffler cover 79, and the discharge space 43 is used only on the second bearing member 21 on the lower side. It has a structure.

That is, the upper first bearing member 20 includes:
A vertically penetrating discharge passage 8 communicating with the discharge port 81
3 are provided.

The discharge passage 83 is covered by a muffler cover 79, and has a discharge valve 85 and a valve stopper 87.
And a structure having:

The discharge space 43 and other components provided on the lower side second bearing member 21 are the same as those shown in FIG. 1 and are denoted by the same reference numerals and will not be described in detail.

According to the second embodiment configured as described above, in the first cylinder 15, the refrigerant sent from the suction pipe 71 is compressed in the compression chamber 75 and then discharged to the discharge port 81. , From the discharge passage 83 and the muffler cover 79 into the closed case 1.

On the other hand, in the second cylinder 17, the refrigerant sent from the suction pipe 71 is compressed in the compression chamber 75, and then is discharged from the discharge port 29, the discharge space 43, and the communication passage 55.
Through the muffler cover 79, merges with the refrigerant discharged from the first cylinder 15, and is discharged into the closed case 1. During this operation, noise caused by the refrigerant discharged from the discharge port 29 is silenced by the discharge space 43 and the muffler cover 79.

Further, the refrigerant discharged from the second cylinder 17 is not directly discharged into the lubricating oil OL without the muffler cover, and an efficient discharge state is ensured. There is no problem that the fluid flows into the cylinders 15 and 17.

In the first and second embodiments, if the present invention is applied to a vertical two-cylinder compressor, a horizontal compressor may be used, and the present invention is also applicable to a one-cylinder compressor. .

[0046]

As described above, according to the rotary compressor of the present invention, since the muffler cover can be omitted depending on the discharge space, it is very preferable in terms of assembly and cost. Moreover, a silencing effect can be obtained.

Further, the refrigerant can be efficiently discharged, and the lubricating oil can be prevented from flowing into the cylinder.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an outline of a rotary compressor according to the present invention.

FIG. 2 is an exploded perspective view of a second bearing member, a valve stopper, a discharge valve, and a port plate.

FIG. 3 is a perspective view of a first bearing member provided with a separate muffler chamber communicating with a discharge space.

FIG. 4 is a perspective view of a second bearing member provided with a separate muffler chamber communicating with a discharge space.

FIG. 5 is a cross-sectional view similar to FIG. 1 in which a muffler chamber penetrating first and second cylinders and a partition plate is provided.

FIG. 6 shows a first cylinder, a port plate, and a second cylinder of FIG. 5;
FIG. 2 is an exploded perspective view of the bearing member of FIG.

FIG. 7 is a cross-sectional view similar to FIG. 1, showing another embodiment in which a structure using a muffler cover and a discharge space are combined.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed case 15, 17 Cylinder 20, 21 Bearing member 23, 27 Port plate 25, 29 Discharge port 31 Discharge space

Claims (5)

[Claims] 1. A rotary compressor having a thin plate port plate having a discharge port for discharging a refrigerant compressed by a cylinder, wherein at least one bearing member communicates with the discharge port, and the discharge port outlet side is connected to at least one bearing member. A rotary compressor characterized by forming a discharge space in a shape of a concave portion to cover. 2. The rotary compressor according to claim 1, wherein the discharge space also serves as a muffler chamber having a predetermined size. 3. The rotary compressor according to claim 1, wherein the discharge space communicates with a muffler chamber provided in a bearing member separately from the discharge space. 4. The rotary compressor according to claim 1, wherein the discharge space communicates with at least a muffler chamber provided in the cylinder. 5. A rotary compressor comprising a thin port plate having a discharge port for discharging refrigerant compressed by a first cylinder and a second cylinder, wherein at least a lower bearing member has a discharge port. And a recessed discharge space that covers the discharge port outlet side.