JPH0278780A - Cylinder suspension control mechanism of multi-cylinder rotating compressor - Google Patents

Abstract

PURPOSE:To prevent the temperature increase of a compression element with a simple structure by providing such a constitution as providing a blocking means for blocking an inlet pipe by the pressure of a high pressure refrigerant solution for external refrigeration and air conditioning cycle at the time of cylinder suspension and introducing the high pressure refrigerant solution into the compression element. CONSTITUTION:A crank shaft 2 is rotated by an electric element 1 to rotate rolling pistons 5a, 5b in determined directions through eccentric parts 4a, 4b having the phases shifted at 180 deg. to each other. When a refrigerant gas to be compressed is taken in from inlet pipes 16a, 16b and compressed, the resulting compressed refrigerant gas pushes open an exhaust valve 15, through which the gas is exhausted outside of a cylinder, namely into a sealed vessel 10. In this case, a liquid refrigerant feed pipe 28 for leading the liquid refrigerant to the slider 18 lower space of a suspended cylinder control mechanism 21 at the time of cylinder suspension control and also communicating between the slider 18 lower space and the inlet chamber side of the suspended cylinder side compression element is provided. Hence, the liquid refrigerant is fed to the suspended cylinder side compression element in the cylinder suspension operation, and then evaporated with taking the heat of evaporation within the compression element, whereby the compression element is cooled.

Description

[Detailed Description of the Invention] [Graduation Field of Application] This invention relates to a multi-cylinder rotary compressor installed in a refrigeration/air conditioning system, and particularly relates to a multi-cylinder rotary compressor whose capacity can be controlled by cylinder deactivation. It is.

[Conventional technology]

FIG. 5 is a vertical cross-sectional view showing a multi-cylinder rotary compressor which was previously proposed by the applicant in Japanese Patent Application No. 81-232604 (filed on September 30, 1986) and whose capacity can be controlled by conventional cylinder deactivation. It is. In Fig. 5, (1) is an electric element, (2)
is a crankshaft that transmits the rotational output of this electric element (1) to the compression element (3), (4.), (4b) are nine core parts provided on this crankshaft +2) with a phase shift of 180 degrees from each other, (5a), (5b) are eccentric parts (4a), (
4b) is a nine-rolling piston that is rotatably fitted and supported by the piston. And rolling piston (5a),
(5b) are arranged vertically in parallel with each other via a partition plate (6), and are busy rotating inside 92 cylinders (7a) and (7b). Also, the crankshaft (2) is
The radial direction is supported by an upper bearing (8a) and a lower bearing (8b) that close each cylinder F (7a), (7'b). Regarding the axial direction, the lower bearing (
8b) is supported by the thrust surface (9).

It is constructed in this way and includes the electrically powered element (1) and the compression element (
3) is housed inside a closed container a1, and lubricating oil @ is stored at the bottom of the container a1. Also, cylinder (7a)
, (7b) have rolling pistons (5a), (sb) as shown in the cross section in FIG.
It is divided into a gas suction chamber α2 and a compression chamber (I:I) by a vane αυ that comes into contact with the vane αυ and slides back and forth inside the vane groove α4. Here, (lla) is a vane spring, and α9 is a compressed gas This is a discharge valve for the suction chamber α2.
are communicated with an accumulator aη of compressed gas from an external refrigerant circuit through suction pipes (15a) and (+6b). The cylinder deactivation control mechanism 12D has a slider frame and a spring α9 inserted in the middle of the lower suction pipe (16a), a housing frame, a slide Fa pupil lower space, and a high pressure part opening/closing valve (23a). to communicate with the Kukyu cylinder control piping B, P24 and the gas suction chamber fla side,
A degassing pipe (c) is provided which communicates with the lower space of the slider phase via an on-off valve (25t+) and a capillary tube.

Note that a small gap (20a) is formed between the slider α barrel of the cylinder deactivation control mechanism 21+ and the housing wall so that the slider as can slide in the vertical direction.

Next, the operation will be explained.

When the crankshaft (2) is rotationally driven by the electric element (1), the eccentric portions (4a) are 180 degrees out of phase with each other.
.

(4b), rolling piston (5a),
(5b) rotates in a predetermined direction inside each cylinder (7a) and (7b). Here, the on-off valve (23a
) to stop the flow of high-pressure gas into the space below the slider r1s, and open the on-off valve (23b) to communicate the space inside the slider (I/lower housing (to) with the suction chamber Q2 to create a low pressure Particularly, the slider is also biased by the flow from the compressed gas accumulator (Iη), and descends under the force of the spring, causing the accumulator (Iη
and the suction chamber α2 of the lower cylinder (7b).

Therefore, in FIG. 6, the rolling piston (5b)
rotates inside the cylinder (7b) in the counterclockwise direction indicated by the arrow, thereby sucking the compressed refrigerant gas into the suction chamber σ2 from the suction pipe (ldb). on the other hand.

In the compression chamber a3, the refrigerant gas already taken in in the previous cycle is compressed as its volume is reduced, and this compressed refrigerant gas is pushed open the discharge valve (II) and discharged outside the cylinder, that is, into the closed container fII. This operation is performed inside the upper and lower cylinders (7a) and (7b), and the crankshaft (2
) is repeated simultaneously with a phase difference of 180 degrees, thereby supplying compressed refrigerant gas to the refrigeration cycle system and operating the refrigeration cycle.

Next, when shutting down the cylinder, close the on-off valve (25b) to block the gas venting pipe (to), open the on-off valve (23a) of the cylinder shutoff control mechanism QD, and open the space below the slider α hoof. Send high pressure gas to raise the slider as, slider +11
By closing the suction pipe (16b) at the upper end and side surfaces, the lower cylinder (7'b) is deactivated and the compression force is controlled.

[Problem to be solved by the invention]

A multi-cylinder rotary compressor equipped with a conventional cylinder deactivation control mechanism is configured as described above, so when cylinder deactivation control is performed by closing the suction pipe (+6b), the vanes similarly do not perform reciprocating sliding. Since the closed suction chamber (I3) is in a near-vacuum state, the high-temperature, high-pressure refrigerant gas that has already been discharged into the sealed container enters through the sliding clearance and is compressed again. The temperature of the compressor will further rise, narrowing the range of conditions under which the compressor can be used, and also causing problems in terms of reliability, such as accelerating the deterioration of lubricating oil and shortening the life of the compressor.

This invention was made to eliminate the above-mentioned problems.
The objective is to obtain a multi-cylinder rotary compressor equipped with a highly reliable cylinder deactivation control mechanism that lowers the temperature of the compressor during cylinder deactivation control and can be used over a wide range of operating conditions.

[Means to solve the problem]

A cylinder deactivation control mechanism for a multi-cylinder compressor according to the present invention is as follows.

A multi-cylinder compression system in which a compression element having a plurality of cylinders is housed in a sealed container, each having a suction pipe for guiding refrigerant from an external refrigeration φ air conditioning cycle to the cylinders, and the cylinders are shut down by closing the suction pipes when the cylinders are shut down. In the machine, a closing means for closing the suction pipe by the pressure of the high-pressure refrigerant liquid of the external refrigeration air conditioning cycle when the cylinder is shut down, a pipe for controlling cylinder shutoff that guides the high-pressure refrigerant liquid to the closing means, and the high-pressure refrigerant It is equipped with a liquid refrigerant supply means for guiding liquid to the cylinder.

[Effect]

The multi-cylinder rotary compression mechanism equipped with a cylinder deactivation control mechanism according to the present invention is capable of guiding liquid refrigerant to the closing means of the cylinder deactivation control mechanism and jetting the liquid refrigerant to the compression element that is deactivated at the time of cylinder deactivation control iX1. As a result, the liquid refrigerant vaporizes and takes away the heat of vaporization from the surroundings, so the temperature of the compression element during the cylinder break period decreases.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In the figure, [1) to @ are completely the same as those in the above-mentioned conventional example. Mano, yp W for cylinder deactivation control
+241 is connected to the high pressure liquid refrigerant circuit of the refrigeration and air conditioning system.

In a multi-cylinder rotary compressor equipped with four cylinder deactivation control mechanisms as described above, during cylinder deactivation control, the eight cylinder deactivation control mechanisms ca
A liquid refrigerant supply pipe (toward) is provided to guide the liquid refrigerant to the lower space of the slider + II of n, and to communicate the lower space of the slider with the suction chamber α2 side of the compression element on the cylinder-inactive side. The liquid refrigerant is supplied to the cylinder-inactive compression element, and at this time, the liquid refrigerant vaporizes within the compression element while taking vaporization heat from the surroundings, thereby decreasing the temperature of the compression element.

FIG. 3 shows another embodiment of the present invention, in which a small hole communicating with the lower intestine space and the compression element suction chamber σ2 side is provided on the side surface of the slider Os.

Figure 4 shows still another embodiment of the present invention, in which the gap (20a) between the housing (2) and the slider L1 ladder is
) is thick (formed).

In the embodiments shown in FIGS. 3 and 4, the liquid refrigerant is also supplied into the compression element (3) through the small hole and the gap (20a) when the cylinder is out of operation, producing the same effect as in the embodiment shown in FIG. 1.

〔Effect of the invention〕

A cylinder deactivation control mechanism for a multi-cylinder rotary compressor according to the present invention stores a compression element having a plurality of cylinders in a sealed container button, and has suction pipes for guiding refrigerant from an external refrigeration/air conditioning cycle to the cylinder buttons, when the cylinders are deactivated. In a multi-cylinder compressor that performs cylinder shutdown by blocking this suction pipe, a blocking means for blocking the suction pipe by the pressure of high-pressure refrigerant liquid in the external refrigeration/air conditioning cycle when the cylinders are shut down; The cylinder deactivation control piping leading to the cylinder deactivation control means and the liquid refrigerant supply means guiding the high-pressure refrigerant liquid to the cylinder are arranged in a ratio structure of 9. Therefore, liquid refrigerant can be supplied to the compression element when the cylinder deactivates when the cylinder is deactivated, and the liquid refrigerant can be supplied to the compression element when the cylinder is deactivated. A multi-cylinder rotary compressor with a cylinder deactivation control mechanism that can suppress the temperature rise of the compression element, can be used over a wide range of conditions, and is highly reliable can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a multi-cylinder rotary compressor according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of the main part of FIG. 1, and FIGS. FIG. 5 is a longitudinal sectional view showing a conventional multi-cylinder rotary compressor, and FIG. 6 is a cross-sectional view of FIG. 5. In the figure, (1) is a closed container, (3) is a compression element,
(7a) (7b) is shi IJ 7ri, (+68),
(+6b) is the suction pipe, aS is the slider, (20
a) is a gap, c! n is cylinder deactivation control mechanism. ①, P24 is a pipe for cylinder deactivation control, @ is a liquid refrigerant supply pipe, and @ is a small hole. Note that the same group numbers in the two figures indicate the same or equivalent parts.

Claims (1)

[Claims] A multi-cylinder compressor in which a compression element having a plurality of cylinders is housed in a sealed container, each having a suction pipe for guiding refrigerant from an external refrigeration/air conditioning cycle to the cylinders, and the cylinders are shut down by closing the suction pipes when the cylinders are shut down. , a closing means for closing the suction pipe by the pressure of the high-pressure refrigerant liquid of the external refrigeration/air conditioning cycle when the cylinder is shut down; a pipe for controlling cylinder shutoff that guides the high-pressure refrigerant liquid to the closing means; A cylinder deactivation control mechanism for a multi-cylinder compressor equipped with liquid refrigerant supply means leading to the cylinders.