JPH01294986A - Multi-cylinder type rotary compressor - Google Patents

Abstract

PURPOSE:To prevent pulsation of suction pressure from being transmitted to the lower space of a slider so as to enhance the silence by forming a gas vent hole in a housing of a rest cylinder control mechanism, and by blocking the gas vent hole in association with the descent of a slider during a compressor being driven at a maximum speed. CONSTITUTION:When a crankshaft 2 is rotated by a motor element 1, rolling pistons 5a, 5b are rotated in cylinders 7a, 7b, respectively, in predetermined directions by means of eccentric parts 4a, 4b. Further, a shut-off valve 23a is closed to stop the flowing of high pressure gas into the lower space of a slider 18 while opening a shut-off valve 23b to communicate a space in a housing 19 below the slider 18 with a suction chamber in order to lower the pressure in the suction chamber, resulting in that the slider 18 descends by being urged by a stream of compressed gas from an accumulator 17. In this phase, a gas vent hole 21 formed in the housing 19 is blocked by the slider 18 so as to eliminate a cause of transmission of pressure pulsation from the suction chamber to the lower space of the slider 18, thereby it is possible to prevent the slider 18 from moving up and down.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a multi-cylinder rotary pressure Wr machine that is incorporated into a refrigeration cycle of an air conditioner or a refrigeration system and whose capacity can be controlled by cylinders according to the load.

[Conventional technology]

FIG. 3 is a longitudinal cross-sectional view showing a conventional multi-cylinder rotary compressor with capacity control using a body cylinder, which was previously proposed by the applicant in Japanese Patent Application No. 61-232604 (filed on September 30, 1986). be. In FIG. 3, 1 is an electric element, 2 is a crankshaft that transmits the rotational output of this electric element 1 to a compression element 3;
4a and 4b are eccentric parts provided on the crankshaft 2 with a phase shift of 180 degrees from each other; 5a and 5b are eccentric parts 4a;
4b is a lorry and a piston rotatably fitted and supported. The roll jig pistons 5a and 5b are connected to two cylinders 7a arranged vertically in parallel with each other via a partition plate 6.
, 7b. The crankshaft 2 also has an upper bearing 8 that closes each cylinder and grooves 7a and 7b.
The radial direction is supported by a and a lower bearing 81). In addition, in the axial direction (I, N) are supported by the thrust surface 9 of the lower bearing 8b. Lubricating oil 26 is stored at the bottom.In addition, as shown in the cross section of FIG. - The gas suction chamber 12 is opened by the vane 11 that slides back and forth inside the groove 14.
and a compressor 13. Note that 11a is a vane spring 7, and 15 is a compressed gas discharge valve. The suction chamber 12 is communicated with an accumulator 17 for compressed gas from an external refrigerant circuit through suction pipes 16a and 16b. Then, the cylinder deactivation control mechanism 20 controls the lower suction pipe 1.
Housing with slider 18 inserted in the middle of 6b]9
The on-off valve 23 connects the gas suction chamber 12 side and the lower space of the slider 18 to the body cylinder control piping 22.24, which communicates the lower space of the slider 18 with the high-pressure part via the on-off valve 23a.
It is provided with a gas venting pipe 25 communicated via b. Note that the slider 18 of the cylinder deactivation control mechanism 20 and the housing 1
A small gap is formed between the sliders 18 and 9 so that the sliders 18 move vertically (n). Next, the operation will be explained. When the crankshaft 2 is rotationally driven by the electric element 1, The rolling piston 5a is connected to the rolling piston 5a through the eccentric parts 4n and 4b which are out of phase.
, 5b are each cylinder 7a. It rotates in a predetermined direction inside 7b. Here, the on-off valve 23a is closed to stop the high-pressure gas from flowing into the space below the slider 18, and the on-off valve 23b is opened to communicate with the space gold suction chamber 12 in the housing 19 below the slider 18 to make the pressure low. As a result, the slider 18 is urged downward by the flow of the compressed gas from the accumulator 17, thereby communicating the accumulator] 7 with the suction chamber 12 of the lower cylinder 7b. Therefore, in FIG. 4, when the Loringe piston 5b rotates inside the cylinder 71) in the counterclockwise direction indicated by the arrow, 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 in the previous cycle is compressed as its volume is reduced, and this compressed refrigerant gas is delivered to the discharge valve 1.
5) and is discharged outside the cylinder, that is, into the closed container 10. By repeating this operation simultaneously inside the upper and lower cylinders 7a and 7b with a phase difference of 180 degrees in the rotation angle of the crack shaft 2, compressed refrigerant gas is supplied to the refrigerant system. , activate the refrigeration cycle. Next, when the cylinder is closed, the on-off valve 23b is closed to block the degassing pipe 25, and the on-off valve 23b of the cylinder deactivation control mechanism 20 is closed.
a is opened, high pressure gas is sent to the space below the slider 18, the slider 18 is raised as shown in FIG. to control the compression force.

[Problem to be solved by the invention] Conventional body cylinder control 8! The structured multi-cylinder rotary compressor is constructed as described above, and during full operation, the space below the slider 18 and the suction chamber 12 are connected to the open/close valve 23b. Since it has a structure in which it communicates via the gas venting pipe 25,
Due to the pulsation of suction pressure due to compressor operation, the slider 18
The pressure in the lower space fluctuates, causing the slider 18 to move up and down, and a collision noise between the slider 18 and the housing 19 may occur. This invention was made to solve the above-mentioned problems, and by making simple structural changes, suction pressure pulsations are prevented from being transmitted to the space below the slider, and the vertical movement of the slider is suppressed, resulting in quieter sound. The objective is to obtain a multi-cylinder rotary compressor. [Means for Solving the Problems] A multi-cylinder rotary compressor according to the present invention has a gas vent hole in a space below a slider, which is provided in a lower side surface of a housing and is closed by a slider.

[For production]

The multi-cylinder rotary compressor according to the present invention can close the gas vent hole provided in the housing by lowering the slider during full operation, thereby preventing suction pressure pulsations from being transmitted to the space below the slider.

[Embodiments 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 in FIG. 3 indicate the same or corresponding parts. The gas vent hole 21 is provided on the lower side surface of the housing 19, and the outer diameter of the bottom of the slider 18 is machined with a flat surface 1.
I am doing 8a. Note that the configuration and basic operation of this embodiment other than those described above are the same as the conventional one shown in FIG. Next, the operation of this embodiment will be explained. During full operation, the slider 18 accumulates the compressed gas.
7, and as it descends, the housing 19
The gas vent hole 21 provided on the lower side of the slider 1
It is closed by the side of 8. Therefore, suction pressure pulsations in the compression chamber 12 are no longer transmitted to the space below the slider 18, and therefore, no vertical movement of the slider 18 occurs. In addition, when switching to body m control, high-pressure gas passes through the gas vent hole 21 through a small gap between the slider 18 and the housing 19, and the high-pressure gas passes through the surface portion 1 on the outer diameter of the lower part of the slider 18.
8a, the slider 18 is pushed up, and the body cylinder rotates.

【Effect of the invention】

As described above, according to the present invention, the gas vent hole is provided in the lower side surface of the housing of the cylinder deactivation control mechanism, and when the slider descends during full operation, the gas vent hole is closed on the side surface of the slider. This prevents the suction pressure pulsations generated in the cylinder suction chamber from being transmitted to the lower space of the slider, making it easy to create a quiet cylinder system. This has the effect of providing a multi-gas co-rotating compressor with an I mechanism.

[Brief explanation of the drawing]

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, and FIG. 3 is a conventional multi-cylinder rotary compressor. FIG. 4 is a longitudinal cross-sectional view of the machine, and FIG. 4 is a cross-sectional view of the cylinder portion thereof. 1 Electric element, 2 Crankshaft, 3 Compression element, 5 Rollinog biston, 6 Partition plate, 7 Cylinder, 8 Upper bearing, 9 Lower bearing, 10 Sealed container, 16 Suction pipe, 1
8 slider, 19 housing, 20 body cylinder control #8
1 structure, 21 gas vent hole. 5. The same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] having an electric element and a compression element housed in a closed container;
This compression element consists of a plurality of cylinders arranged vertically in parallel with each other via a partition plate, upper and lower bearings that block the upper and lower sides of these cylinders, and a crankshaft that is driven by the electric element and supported by the upper and lower bearings. and a rolling piston provided in each of the cylinders and to which rotational force is transmitted from the crankshaft, and at least one of the refrigerant gas suction pipes independently communicating with the cylinders is provided in the housing. A multi-cylinder rotary compressor is configured by inserting a slider for opening and closing a suction pipe into the housing, and is provided with a cylinder deactivation control mechanism having a gas vent hole in a space below the slider, wherein the gas vent hole is provided in a lower side surface of the housing. , A multi-cylinder rotary compressor characterized in that it has a structure that is closed by the slider.