JPH0737797B2 - Multi-cylinder rotary compressor - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a multi-cylinder rotary compressor which is incorporated in a refrigeration cycle of an air conditioner or a refrigeration system and is capable of performing capacity control by cylinder deactivation according to a load.

[Prior art]

FIG. 3 is a vertical cross-sectional view showing a conventional multi-cylinder rotary compressor capable of controlling the capacity by a cylinder deactivation, which the applicant previously proposed by Japanese Patent Laid-Open No. 63-88297. In FIG. 3, 1 is an electric element, 2 is a crankshaft for transmitting the rotational output of the electric element 1 to the compression element 3, and 4a and 4b are 1 with respect to the crankshaft 2.
Eccentric parts provided with 80 ° phase shift, 5a and 5b are eccentric parts 4
The rolling piston is rotatably fitted and supported by a and 4b. The rolling pistons 5a and 5b are adapted to rotate inside the two cylinders 7a and 7b which are vertically arranged side by side through the partition plate 6, respectively. Also, the crankshaft 2
Is an upper bearing 8a and a lower bearing 8 that close each cylinder 7a, 7b.
The radial direction is supported by b. Further, in the axial direction, it is supported by the thrust surface 9 of the lower bearing 8b. The electric element 1 and the compression element 3 configured in this way are
It is housed inside the closed container 10, and the lubricating oil 26 is stored at the bottom thereof. In addition, the inside of the cylinders 7a, 7b is
Rolling pistons 5a, 5
Vane 11 which is installed on b and slides back and forth inside the vane groove 14
Is divided into a gas suction chamber 12 and a compression chamber 13. In addition, 11a is a vane spring, and 15 is a discharge valve of compressed gas. The suction chamber 12 is in communication with an accumulator 17 for compressed gas from an external refrigerant circuit by suction pipes 16a and 16b. The cylinder deactivation control mechanism 20 includes a housing 19 having a slider 18 inserted in the middle of the lower suction pipe 16b.
And a cylinder deactivation control pipe 22, 24 in which the slider 18 lower space and the high-pressure portion are communicated with each other via an on-off valve 23a, the gas suction chamber 12 side, and the slider 18 lower space via an on-off valve 23b. It is provided with a gas releasing pipe 25 which is in communication with each other. In addition, a slider is installed between the slider 18 of the cylinder control mechanism 20 and the housing 19.
A minute gap is formed so that 18 slides in the vertical direction. Next, the operation will be described. When the crankshaft 2 is rotationally driven by the electric element 1, the rolling pistons 5a and 5b rotate in a predetermined direction inside the cylinders 7a and 7b via the eccentric portions 4a and 4b which are 180 degrees out of phase with each other. . Here, the on-off valve 23a is closed to stop the inflow of high-pressure gas into the lower space of the slider 18, and the on-off valve 23b is opened to communicate the space inside the housing 19 below the slider 18 with the suction chamber 12 to reduce the pressure. As a result, the slider 18 is moved downward by being urged by the flow of the compressed gas from the accumulator 17, and connects the accumulator 17 and the suction chamber 12 of the lower cylinder 7b. Therefore, in FIG. 4, the rolling piston 5b rotates inside the cylinder 7b in the counterclockwise direction indicated by the arrow, so that the compressed refrigerant gas is sucked into the suction chamber 12 from the suction pipe 16b. On the other hand, in the compression chamber 13, the refrigerant gas that has already been sucked in the previous cycle is compressed due to its volume reduction, and the compressed refrigerant gas pushes the discharge valve 15 open to the outside of the cylinder,
That is, it is discharged into the closed container 10. By repeating this operation in the upper and lower cylinders 7a, 7b at the same time while having a phase difference of 180 degrees in the rotation angle of the crankshaft 2, compressed refrigerant gas is supplied to the refrigerant cycle system, Operate the refrigeration cycle. Next, when the cylinder is deactivated, the on-off valve 23b is closed to close the degassing pipe 25, the on-off valve 23a of the cylinder deactivation control mechanism 20 is opened, and high-pressure gas is sent to the space below the slider 18, As shown in FIG. 3, the slider 18 is raised and the upper end surface and side surface of the slider 18 close the suction pipe 16b, so that the lower cylinder 7b is deactivated and the compression functional force is controlled.

[Problems to be Solved by the Invention]

The conventional multi-cylinder rotary compressor with a cylinder deactivation control mechanism is configured as described above, and at the time of full operation, the lower space of the slider 18 and the suction chamber 12 are connected via the on-off valve 23b and the degassing pipe 25. Because of the communication structure, the pressure in the lower space of the slider 18 may fluctuate due to the pulsation of the suction pressure due to the operation of the compressor, and the slider 18 may move up and down, causing a collision noise between the slider 18 and the housing 19. It was The present invention has been made to solve the above problems, and prevents the pulsation of the suction pressure from being transmitted to the slider lower space by a simple structure change, and suppresses the slider from moving up and down to reduce the noise. The purpose is to obtain a multi-cylinder rotary compressor.

[Means for Solving the Problems]

In the multi-cylinder rotary compressor according to the present invention, a gas vent hole of the slider lower space communicating with the cylinder side of the suction pipe is provided on the lower side surface of the housing during full operation, and is closed by the slider when the suction pipe of the slider is opened. It was done.

[Action]

In the multi-cylinder rotary compressor according to the present invention, at the time of full operation, the slider descends to close the gas vent hole provided in the housing, and the slider lower part is passed from the suction chamber to the cylinder side suction pipe and the gas vent pipe. Transmission of suction pressure pulsation to the space can be prevented.

Examples of the invention

An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, the same reference numerals as those in FIG. 3 indicate the same or corresponding portions. The gas vent hole 21 is provided in the lower side surface of the housing 19, and the outer diameter of the bottom portion of the slider 18 is subjected to surface trimming 18a. The configuration and basic operation of this embodiment other than those described above are the same as those of the conventional one shown in FIG. Next, the operation of this embodiment will be described. During full operation, the slider 18 is urged by the flow of compressed gas from the accumulator 17, and when the slider 18 descends, the gas vent hole 21 provided in the lower side surface of the housing 19 is closed by the side surface of the slider 18. Therefore, the suction pressure pulsation of the compression chamber 12 is not transmitted to the lower space of the slider 18, and
The vertical movement of the slider 18 also does not occur. Further, when switching to the cylinder deactivation control, the high-pressure gas flows from the gas vent hole 21 through the minute gap between the housings, which is the slider 18, to the surface toric portion 18a of the lower outer diameter of the slider 18, and pushes up the slider 18. , Perform cylinder deactivation operation.

【The invention's effect】

As described above, according to the present invention, the degassing hole is provided on the lower side surface of the housing of the cylinder deactivation control mechanism, and the slider is lowered during the full operation to close the degassing hole on the side surface of the slider. As a result, it is possible to prevent the suction pressure pulsation generated in the suction chamber of the cylinder from being transmitted to the slider lower space, and it is possible to easily obtain a multi-cylinder rotary compressor with a cylinder deactivation control mechanism that produces a quiet noise. .

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a multi-cylinder rotary compressor according to an embodiment of the present invention, FIG. 2 is an enlarged vertical cross-sectional view of the cylinder deactivation control mechanism section, and FIG. 3 is a conventional multi-cylinder rotary compression. FIG. 4 is a longitudinal sectional view showing the machine, and FIG. 4 is a transverse sectional view of the cylinder portion thereof. 1 ... electric element, 2 ... crankshaft, 3 ... compression element,
5 ... rolling piston, 6 ... partition plate, 7 ... cylinder, 8 ... upper bearing, 9 ... lower bearing, 10 ... sealed container,
16 …… Suction pipe, 18 …… Slider, 19 …… Housing, 20
…… Cylinder control mechanism, 21 …… Gas vent. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

[Claims] 1. An electric element and a compression element housed in a hermetically sealed container, the compression element including a plurality of cylinders arranged in parallel above and below via a partition plate and for closing the top and bottom of these cylinders. , A lower bearing, a crankshaft driven by the electric element and supported by the upper and lower bearings, and rolling pistons respectively provided in the cylinder and transmitting a rotational force from the crankshaft. And a slider for opening and closing the suction pipe is inserted in the housing in the middle of at least one of the suction pipes of the refrigerant gas that are independently communicated with each other. In a multi-cylinder rotary compressor provided with a cylinder deactivation control mechanism having a gas vent hole communicating with the side, the gas vent hole is provided on the lower side surface of the housing, and Multi-cylinder rotary compressor which is characterized in that the structure is closed by the slider to the suction pipe opening at Ida.