JPS6357889A - Rotary type compressor - Google Patents

Abstract

PURPOSE:To enable simple change of capacity of a compressor, by a method wherein at least one valve, capable of effecting two types of combination running out of plural types of running in combination of rotary compression mechanisms is situated in the suction route of plural rotary compression mechanisms. CONSTITUTION:Plural rotary compression mechanisms 5 and 6 are disposed to the lower part of the interior of a container 1, and a motor 3 exerting a rotation power on the rotary compression mechanisms 5 and 6, the disposed. In this constitution, suction pipes 15 and 23 of the rotary compression mechanisms 5 and 6 are connected to a low pressure gas guide pipe 29 through electromagnetic valves 27 and 28, respectively. After, by effecting operation in a state in that the one 27 of the electromagnetic valves is opened and the other 28 is closed, low pressure gas is guided to the one compression chamber 9, the gas is guided to the other compression chamber 19 through communication passages 16 and 24, and the one rotary compressing mechanism 5 is operated as a supercharger. By closing the one electromagnetic valves 27 and opening the other electromagnetic valve 28, only the other rotary compression mechanism 6 is operated as a compressor.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a nine-rotary compressor, and particularly to a rotary compressor whose capacity can be varied in multiple stages.

(Prior Art) As is well known, some single-rotary compression rocks are equipped with two rotary compression mechanisms, and the rotary pistons of these rotary compression mechanisms are driven by a common motor. In such a type of rotary compressor, by appropriately setting the arrangement of the two rotary pistons, it is possible to achieve low noise and low vibration.

However, even with this type of rotary compressor, 2
Like a normal rotary compressor, its capacity remains constant during operation, and to vary the capacity it is necessary to control the input frequency of the motor, which poses the problem of complicating the power supply system.

(Problems to be Solved by the Invention) As mentioned above, in the conventional rotary compressor of this type,
On the other hand, it can reduce noise and vibration.

There was a problem that the power supply system became complicated.

Therefore, an object of the present invention is to provide a rotary compressor whose capacity can be varied without compromising the characteristics of the system in which two one-rotation compression mechanisms are provided and without complicating the power supply system.

[Structure of the invention] (Means for solving the problem) The present invention has two rotary compression mechanisms, each rotary compression mechanism v#
The target is a rotary compression type in which a J-structure rotary piston is driven by a common motor.

One such rotary compressor according to the present invention.

At least one valve is provided in at least one of the suction path to the rotary compression mechanism and the discharge path from the rotary compression mechanism, which enables at least two combined operations among four combined operations of the respective rotary compression mechanisms. There is.

(Function) By opening and closing the valve, for example, it is possible to operate two rotary compression mechanisms connected in series, or to operate using only one of the rotary compression mechanisms, increasing the capacity. This means that it can be varied in multiple stages. Therefore, the capacity can be varied without using a variable frequency power supply.

(Example) Examples will be described below with reference to two drawings.

In FIG. 1, 1 is a cylindrical container with both ends closed. A rotary compression mechanism 2 is disposed in the lower part of the container 1 in the figure, and a motor 3 that provides rotational power to the rotary compression mechanism 2 is disposed above.

The rotary compression mechanism 2 includes a first rotary compression mechanism 5 disposed above the partition wall 4 and a second compression camera 6 disposed below.

The first compression mechanism 5 includes a cylinder 10 whose upper end opening is closed by a bearing 8 that supports the rotating shaft 7 of the motor 3, and whose lower end opening is closed by the partition wall 4 to form a compression chamber 9, as shown in FIG. As shown in FIG. 2, a rotary piston 11 is accommodated in a cylinder 10 and eccentrically fixed to a rotary shaft 7, and a distal end portion is inserted into a groove formed on the inner surface of the cylinder 10 through an elastic body so as to be freely retractable. is the rotating piston 11
A blade 12 that is always in sliding contact with the outer peripheral surface of the cylinder 10
It is comprised of a suction port 13 provided on one side of the inner surface of the blade 12 and a discharge port 13 provided on the other side. The suction port 13 communicates with one end of a suction pipe 15, and the other end of the suction pipe 15 penetrates the wall of the container 1 and is led to the outside. Further, the discharge port 14 is connected to the partition wall 4
This discharge boat 1 is connected to a discharge boat 16 provided in the
6 is provided with a discharge valve 17.

The second rotary compression mechanism 6 is also configured in the same manner as the first rotary compression mechanism 5, with an upper end opening closed by the partition wall 4 and a lower end opening comprising a bearing 18 that supports the rotating shaft 7 of the motor 3.
a cylinder 20 that is closed by and forms a compression chamber 19;
A rotary piston 21 is accommodated in the cylinder 20 and eccentrically fixed to the rotary shaft 7, and a distal end portion is inserted into a groove formed on the inner surface of the cylinder 20 through an elastic body so as to be freely retractable. is always 1 on the outer peripheral surface of the rotating piston 21.
It is composed of a blade (not shown) that comes into contact with the cylinder 20, a suction port (not shown) provided on one side of the inner surface of the cylinder 20 with the blade as a boundary, and a discharge port 22 provided on the other side. The suction port communicates with the discharge boat 16 of the first rotary compression mechanism 5 through one end of the suction pipe 23 and a passage 24, and the other end of the suction pipe 23 penetrates the wall of the container 1. and are led to the outside. Further, the discharge port 22 is
It communicates with a discharge boat 25 provided on the bearing 18, and this discharge boat 25 is provided with a discharge valve 26.

On the other hand, the suction pipe 15.23 led to the outside.

Low pressure gas guide pipes 29 via solenoid valves 27, 28 respectively
It is connected to the. The solenoid valves 27 and 28 are selectively energized and controlled by a capacity setting device (not shown). In addition.

Reference numeral 30 in FIG. 1 indicates a high pressure gas guide pipe.

With such a configuration, the solenoid valve 27 is now in the closed state,
When operating with the solenoid valve 28 set to the closed state, low-pressure gas flows through the solenoid valve 27. After the suction pipe 15 is guided into the compression chamber 9 through the suction port 13 and compressed, the discharge valve 17. After the discharge boat 161 is introduced into the compression chamber 19 through the passage 24 and compressed, the discharge valve 26. It will be guided into the container 1 via the discharge boat 25. Therefore, the first rotary compression R mechanism 5 functions as a supercharger.

On the other hand, if the electromagnetic valve 27 and the electromagnetic valve 28 are set to an open state and operated, only the second rotary compression mechanism 6 functions as a compressor.

In this way, the overall capacity can be varied simply by controlling the solenoid valves 27, 28. Therefore, unlike conventional compressors, there is no need to vary the capacity by controlling the power frequency, so the power system can be simplified.

FIG. 3 shows another embodiment of the present invention.

The same parts as in FIG. 1 are indicated by the same reference numerals. Therefore, explanation of the overlapping portion will be omitted.

In this embodiment, the first rotary compression mechanism 5 has a discharge boat 16.
Piping 31. It is connected to the outlet of the solenoid valve 28 through a solenoid valve 32, and the piping 31 is communicated into the container 1 through a solenoid valve 33.

With such a configuration, by setting the solenoid valves 27.32 to the open state and the solenoid valves 28.33 to the closed state,
The first rotary compression mechanism 5 and the second rotary compression mechanism 6 can be connected and operated in series. Also, the solenoid valve 27.
33 in the open state, by setting the solenoid valve 28.32 in the open state.

Only the first rotary compression mechanism 5 can be operated independently. Conversely, by setting the solenoid valves 27, 32, 33 to the closed state and the solenoid valve 28 to the open state, only the second rotary compression mechanism 6 can be operated independently. Furthermore, by setting the z1 valves 27, 28, and 33 in the open state and the solenoid valve 32 in the closed state, the first rotary compression mechanism 5 and the second rotary compression mechanism 6 can be operated in parallel.

Thus, in this embodiment, two rotary compression mechanisms 5.
Any driving mode can be selected from among the four possible driving modes by combining 6. Therefore, the capacity can be varied more finely, and in particular, if the capacities of the first and second rotary compression mechanisms 5 and 6 are made different, the capacity can be varied more finely.

Note that the present invention is not limited to the embodiments described above. That is, in each embodiment, a solenoid valve is used as the valve, but a manually operated valve may also be used. Also, the first
In the case of the embodiment shown in the figure.

A three-way valve may be interposed in the branch portion indicated by A in the figure to reduce the number of valves. Furthermore, in the embodiment shown in FIG. 1, the discharge boat 16 may not be connected to the suction pipe 23, but may be made to communicate directly into the container 1.

[Effects of the Invention] As described above, according to the present invention, it is possible to provide a rotary pressure fI valve in which the capacity of the compressor can be changed simply by opening and closing the valve, thereby simplifying the power supply system.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a rotary compressor according to an embodiment of the present invention, FIG. 2 is a view of the compressor cut along the line X-X in FIG. FIG. 3 is a schematic diagram of a rotary compressor according to another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Container, 2... Rotary compression mechanism, 3... Motor, 5... First rotation compression mechanism, 6... Second rotational pressure 11111E! Structure. 15.23... Suction pipe, 24... Passage, 27.2
8゜32.33... Solenoid valve, 31... Piping. Applicant's agent Patent attorney Takehiko Suzue No. 1 Figure Hatake 2 Figure

Claims (3)

[Claims] (1) In a rotary compressor that has two rotary compression mechanisms and the rotary pistons of each rotary compression mechanism are driven by a common motor, the suction path to the rotary compression mechanism and the discharge from the rotary compression mechanism A rotary compressor characterized in that at least one of the paths is provided with at least one valve that enables at least two of the four combined operations of the rotary compression mechanisms. (2) The rotary compressor according to claim 1, wherein the valve is opened and closed by an electric signal. (3) The rotary compressor according to claim 1, wherein the valve is manually opened and closed.