JPS5963393A - Multicylinder rotary compressor - Google Patents

Abstract

PURPOSE:To separate completely adjacent compressive elements from each other for running a compressor under capacity control by providing a clutch between crankshafts of the adjacent compressive elements of a plurality of said elements provided axially. CONSTITUTION:When a second compressive element 4 is separated and only a first one 3 is run, a motor 2 is stopped and current to an electromagnetic coil 19 is cut. Thus, a first engaging clutch plate 17 of a clutch 5 is damagnetized and a second engaging clutch plate 18 is dropped by its own weight so that the engagement of engaging claws 17a, 18a of first and second engaging clutch plates 17, 18 is released and crankshafts 7, 12 of first and second compressive elements 3, 4 are separated from each other. Under this condition, a motor 2 is driven so that only the first compressive element 3 carries out the gas compressing action.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a multi-cylinder rotary compressor, and particularly to a multi-cylinder rotary compressor intended for power saving during capacity control operation.

[Prior art]

Conventionally, the technology for controlling the capacity of a multi-cylinder rotary production W4 machine is to operate the compression elements of the number of compressors under no load, by either closing the suction side or opening the discharge side. There is.

However, in the former case, since the compression element is placed in a high-pressure sealed container, high-pressure refrigerant gas leaks into the low-pressure cylinder, causing a weak compression effect due to the eccentric rotation of the rollers and the vanes, resulting in waste. Consume input. On the other hand, in the latter case, a pressure difference occurs between the discharge side and the suction side, necessitating unnecessary input. In addition, since these compression elements that perform no-load operation have sliding parts such as bearings, rollers, and vanes, power loss due to friction is unavoidable, and even no-load operation consumes a considerable amount of wasted input, making it difficult to control capacity. There was a problem with poor compression performance during operation.

[Purpose of the invention]

The purpose of the present invention is to solve the problems of the prior art described above,
It is an object of the present invention to provide a multi-cylinder rotary compressor that can save power during capacity control operation and improve compressor performance during capacity control operation.

[Summary of the invention]

The present invention includes at least a cylinder, a roller that eccentrically rotates within the cylinder, a vane that contacts the roller and divides the space within the cylinder into two, a crankshaft that eccentrically rotates the roller, and a roller that rotates eccentrically within the cylinder. A plurality of compression elements are installed in the axial direction and each includes an end plate that is attached to the opening 11 and forms a compression chamber with a cylinder, a roller, and a vane,
The crankshaft of one compression element is connected to a drive source, and a clutch is provided between the crankshafts of adjacent compression elements, so that both crankshafts can be freely connected and disconnected. With this configuration, the above object can be reliably achieved.

[Embodiments of the invention]

Hereinafter, the present invention will be explained based on the drawings.

FIG. 1 shows an example of the present invention comprising two compression elements, a first compression element and a second compression element,
Figure 2 (a) l (b) shows the first. 6 shows a clutch provided between the crankshafts of the second compression element, and FIG. 6 shows the clutch provided between the crankshafts of the second compression element. The second of the second clutch plates
Details of the clutch plate are shown.

The multiple cylinder rotary compressor shown in FIG. 1 includes a closed container 1, a motor 2 which is a driving source installed in the upper part of the closed container 1, a first compression element 3 installed below this, A second compression element 4 installed axially below this
, a clutch 5 provided between the crankshaft of the first compression element 5 and the crankshaft of the second compression element 4.

The first compression element 3e11, the cylinder 6, the crankshaft 7, a roller 8 coupled to the eccentric portion 7a of the crankshaft 7 and eccentrically rotating within the cylinder 6, and a roller 8 that comes into contact with the roller 8 to open the space inside the cylinder 6. A vane (not shown) that divides the cylinder into a high-pressure chamber and a low-pressure chamber, an upper end face plate 9 that closes the upper opening of the cylinder 6 and supports the intermediate portion of the crankshaft 7 with a bearing 9a, and a lower opening of the cylinder 6. and the bearing part 1
The crankshaft 7 has a lower end face plate 1o that supports the lower end of the crankshaft 7 by 0a, and a compression chamber that is kept airtight by the cylinder 6, the roller 8, the vane, and the upper and lower end face plates 9 and 10. . The crankshaft 7 of the first compression element 6 is directly connected to the motor 2.

On the other hand, the second compression element 4 is connected to a cylinder 11 , a crankshaft 12 provided on the same center line as the crankshaft 7 of the first compression element 6 , and an eccentric portion 12 a of the crankshaft 12 and inside the cylinder 11 . A vane (not shown) that contacts the roller 15 and divides the inside of the cylinder 11 into a high-pressure chamber and a low-pressure chamber, and a vane (not shown) that closes the upper opening of the cylinder 11 and is cranked by a bearing 14a. axis 1
an upper end face plate 14 that supports the upper end of the cylinder 1; a lower end face plate 15 that closes the lower opening of the cylinder 11 and supports the lower end of the crankshaft 12 with a bearing 15a;
1, a roller 16, a vane, and a compression chamber that is kept airtight by upper and lower end face plates 14 and 15.

The clutch 5 includes a cover ring 16 attached between the lower end face plate 10 of the first compression element B and the upper end face plate 14 of the second compression element 4 for positioning both, and a crankshaft of the first compression element 6. 7, a first dog clutch plate 17 fixed to the lower end of the second compression element 4, and a crankshaft 1 of the second compression element 4;
The upper end of the second meshing clutch plate 18 and the electromagnetic coil 19 are provided, and the first and second meshing clutch plates 17 and 18 are surrounded by a case 20. As shown in FIG. 2 (!1), the first meshing clutch plate 17 has meshing pawls 17a on its lower surface at intervals in the circumferential direction.
is provided.

The 20th dog clutch plate 18 has the structure shown in FIG. 2(a).
.

As shown in FIG. 3(b) and FIG. 3, interlocking pawls 18 engage with the interlocking pawl 17a at intervals in the circumferential direction.
a is provided and still the second dog clutch plate 1
8 is a fitting between a key portion 12b provided at an interval in the circumferential direction at the upper end of the crankshaft 12 of the second compression element 4 and a keyway 18b formed in the second dog clutch plate 18 itself. It is slidably attached in the axial direction via a joint. The electromagnetic coil 19 is connected to the first dog clutch plate 1
7 and is fixed to the lower surface of the lower end face plate 10 of the cylinder 6 of the first compressed carbon 6 .

Note that the gas suction pipe 21 is connected to the cylinder 6 of the first compression element B, and the cylinder 11 of the second compression element 4 is connected to the cylinder 6 of the first compression element B.
A gas suction pipe 22 is connected to the airtight container 1, and a compressed gas discharge pipe 2'5 is further connected to the upper part of the closed container 1.

The mesh frame for forming a plural cylinder rotary according to the above embodiment operates as follows.

That is, with the motor 2 stopped, the electromagnetic coil 1
9 is energized, the first dog clutch plate 17 of the clutch 5 is magnetized, and the second dog clutch plate 18 is attracted to the first dog clutch plate 17, and as shown in FIGS. 1 and 2 (-). As shown, the engaging pawls 17a and 18a of the first and second engaging clutch plates 17, 18 are engaged, and the crankshaft 7 of the first compression element B and the crankshaft 12 of the second compression element 4 are engaged. Concatenated.

When the motor 2 is driven in this state, the roller 8 is rotationally driven through the crankshaft 7 of the first compression element 6, and the roller 8 is driven to rotate through the crankshaft 12 of the second compression element 4 through the clutch 5.
The rotational force is transmitted to the roller 1 by the crankshaft 12.
3 is rotationally driven.

Therefore, through the gas suction pipe 21 the first compression element 6
Gas to be compressed is sucked into the cylinder 6 of the cylinder 6, and the gas is compressed by the rollers 8 in the compression chamber.The compressed high-pressure gas is led to the upper chamber of the closed container 1, and in equilibrium with this, the gas suction pipe Gas to be compressed is sucked into the cylinder 11 of the second compression element 4 from 22, the gas is compressed by the roller 16 in the compression chamber, and the compressed high pressure gas is discharged into the discharge space formed in the cover ring 16. The compressed gas discharge pipe 2 is guided to the upper chamber of the closed container 1 through
Extracted from 3.

Next, the second compression element 4 is separated and the first compression element 5 is removed.
When only the motor 2 is operated, the motor 2 is stopped and the energization to the electromagnetic coil 19 is stopped. As a result, the first dog clutch plate 17 of the clutch 5 is demagnetized, the second dog clutch plate 18 falls due to its own weight, and the first dog clutch plate 17 is demagnetized.
．． Second meshing clutch plate 17. 18 meshing pawl 1
7a and 18a are disengaged, and the second ['? I (
As shown in b), the first. The crankshafts 7, 12 of the second compression element 6.4 are separated.

If the motor 2 is driven in this state, only the first compression element 6 will compress the gas. This allows the second
Capacity control operation is possible in which the compression capacity of the compression element 4 is reduced.

In addition, in the operation mode of only the first compression element 3, the second compression element 4 is completely separated from the first compression element, and each member of the second compression element 4 does not operate at all. , power consumption can be significantly reduced, and power loss due to unnecessary compression work and friction of the second compression element 4 can be eliminated, so input can be significantly reduced, and therefore the compressor during capacity control operation can be Performance can be improved.

Note that the present invention is directed to the first axial direction. The present invention is not limited to the illustrated embodiment in which the second compression element filter 4 is provided, but can also be applied to an embodiment in which six or more compression elements are provided.

〔Effect of the invention〕

According to the present invention described above, a clutch is provided between the crankshafts of adjacent compression elements in a plurality of compression elements installed in the axial direction, and the configuration is such that the two crankshafts can be freely connected and disconnected. As a result, during capacity control operation, adjacent compression elements can be completely separated and operated, resulting in a significant reduction in power consumption and eliminating power loss due to wasted compression work and friction of compression elements during shutdown. This has the effect of improving compressor performance because the input can be reduced to a small amount.

[Brief explanation of the drawing]

Figures 1 to 6 show one embodiment of the present invention.
The figure is a vertical side view, FIGS. 2(R) and (b) are enlarged vertical sectional views of the clutch in its operating state, and FIG. 6 is a first section of the clutch. FIG. 3 is an exploded enlarged perspective view of a second dog clutch plate of the second dog clutch plates and a crankshaft of a second compression element. 1...Airtight container, 2...Motor as a driving source. 4... 1st. Second compression element, 5...Clutch, 6
゜11... 1st. Cylinder of the second compression element, 7.1
:l)...same crankshaft, 8,13...same roller,
9+10; 14°15... Cylinder end plate, 17,
18... 1st and 2nd meshing clutch plates of the clutch, 17a, 18a... same meshing pawl, 19...
Electromagnetic coil, 21, 22... Gas suction pipe, 26...
Ball mesh gas discharge pipe. Agent Patent Attorney Tadashi Akimoto Jini 1 Diagram A: 'f 2 j Yu 1 (b) Button 3

Claims (1)

[Claims] 1. At least a cylinder, a roller that rotates eccentrically within the cylinder, a vane that contacts the roller and divides the space within the cylinder into two, a crankshaft that rotates the roller eccentrically, and openings on both end faces of the cylinder. A plurality of compression elements are installed in the axial direction, each having a cylinder, a roller, and an end plate that forms a compression chamber with a vane, and the crankshaft of one compression element is connected to a drive source, and the adjacent A clutch is provided between the crankshafts of the elements,
A multiple cylinder rotary compressor characterized by being configured so that both crankshafts can be freely connected and disconnected.