KR20070000541A - Discharging structure of a sharing type for a multiple rotary compressor - Google Patents

Abstract

A common type discharging structure of a multiple rotary compressor is provided to form discharge ports per cylinder in a common type discharge structure, thereby preventing dual use of component parts and complexity thereof. A common type discharging structure of a multiple rotary compressor includes a floater(200), and a floater channel(210) formed in a floater middle bearing(113) to dispose the floater inside. Upper and lower discharge channels(220,230) are respectively formed in upper and lower cylinders(111,121), which are disposed at upper and lower parts of the floater middle bearing, to be communicated with the floater channel, and opened or closed by the floater, which moves in the floater channel by force of compression gas discharged from the upper and lower cylinders. A refrigerant discharge channel(300) guides refrigerant gas to a muffler(116), wherein the refrigerant gas is discharged from the upper and lower cylinders alternately by the movement of the floater.

Description

Shared discharge structure of double rotary compressor {DISCHARGING STRUCTURE OF A SHARING TYPE FOR A MULTIPLE ROTARY COMPRESSOR}

1 is a cross-sectional view showing an example of a conventional double rotary compressor,

2 is a cross-sectional view showing only the compression mechanism side in order to explain the discharge structure in the compression mechanism of the conventional double rotary compressor;

3 is a cross-sectional view showing only the compression mechanism side to explain the shared discharge structure of the double rotary compressor according to an embodiment of the present invention;

4 is an enlarged cross-sectional view of the discharge structure part of FIG. 3;

5 is an enlarged cross-sectional view illustrating another embodiment of the discharge channel of FIG. 3;

FIG. 6 is a perspective view of an exemplary embodiment of the plotter of FIG. 3. FIG.

** Description of the symbols for the main parts of the drawings **

111: upper cylinder 112: upper bearing

113: plotter intermediate bearing 116: muffler

121: lower cylinder 122: lower bearing

200,500,600: Plotter 210: Plotter Channel

220: upper discharge channel 230: lower discharge channel

300,400: refrigerant discharge channel

The present invention relates to a double rotary compressor, and more particularly, to a shared discharge structure of a double rotary compressor in which a refrigerant discharged from two cylinders using a plotter is discharged at one place.

Generally, a compressor converts mechanical energy into compressive energy of a compressive fluid, and is generally classified into reciprocating type, scroll type, centrifugal type, and vane type.

Among them, a rotary compressor is mainly applied to an air conditioner such as an air conditioner. Recently, a so-called double rotary compressor having a plurality of compression parts by symmetrically forming an eccentric portion of a rotating shaft to increase the compressor capacity and reduce the unloading load has been proposed. .

1 is a cross-sectional view showing an example of a conventional double rotary compressor, Figure 2 is a cross-sectional view showing only the compression mechanism side in order to explain the discharge structure in the compression mechanism of the conventional double rotary compressor.

As shown in the drawing, the conventional double rotary compressor includes a casing 1 for communicating a plurality of refrigerant suction pipes SP1 and SP2 and one refrigerant discharge pipe DP, and an upper side of the casing 1. In order to generate the rotational force, the rotational force generated in the transmission mechanism part 2 and the transmission mechanism part 2 made up of the stator 2a and the rotor 2b and up and down under the casing 1 are applied to the rotation shaft 3. The first compressor mechanism 10 and the second compressor mechanism 20 for compressing the refrigerant, respectively.

In addition, an accumulator 30 for separating liquid refrigerant from the suction refrigerant is connected to the inlet side of each of the compression mechanism units 10 and 20, and the outlets of the accumulator 30 are respectively the inlets 11a of the upper cylinder 11. ) And the inlet 21a of the lower cylinder 21.

The first compression mechanism 10 is formed in an annular shape to cover the upper cylinder 11 installed in the casing 1 and the upper and lower sides of the upper cylinder 11 to form a first internal space V1 together. The upper bearing 12 and the intermediate bearing 13 supporting one rotation shaft in a radial direction and the upper eccentric portion of the rotation shaft 3 to be rotatably pivoted in the first inner space (V1) of the upper cylinder (11) While the upper rolling piston (14) for compressing the refrigerant and the upper cylinder (11) to be movable in a radial direction so as to be in pressure contact with the outer peripheral surface of the upper rolling piston (14) the first inner space of the upper cylinder ( The upper vane (not shown), which divides V1) into the first suction chamber and the first compression chamber, and the tip of the upper discharge port 12a provided in the upper bearing 12 are opened and closed to be discharged from the first compression chamber. Upper discharge valve 15 for controlling the discharge of refrigerant gas {and upper discharge Retainer (not shown) for limiting the amount of warp to prevent deformation of the groove 15, and the upper muffler 16 for receiving the upper discharge valve 15 and fixed to the upper surface of the upper bearing 12 )

The second compression mechanism 20 is formed in an annular shape to cover the lower cylinder 21 installed below the upper cylinder 11 inside the casing 1 and the upper and lower sides of the lower cylinder 21 together with the second internal space. (V1) and the intermediate bearing 13 and the lower bearing 22 to support the rotary shaft 3 in the radial and axial directions, and the lower cylinder by rotatably coupled to the lower eccentric portion of the rotary shaft (3) The lower rolling piston 23 which compresses the refrigerant while turning in the second inner space V2 of 21) and the lower cylinder 21 are movably coupled in a radial direction so as to be pressed against the outer circumferential surface of the lower rolling piston 23. A lower vane (not shown) for dividing the second inner space V2 of the lower cylinder 21 into a second suction chamber and a second compression chamber, and a lower discharge port 22a provided at the lower bearing 22. It is coupled to open and close to control the discharge of the refrigerant gas discharged from the second compression chamber. The sub-discharge valve 24 (and a retainer, not shown) for limiting the deflection amount in order to prevent deformation of the lower discharge valve 24, and the lower discharge valve 24 to accommodate the lower bearing ( It consists of a lower muffler 25 fixed to the bottom of the 22).

In the drawings, reference numeral 31 denotes an inlet refrigerant guide tube, and 32a and 32b are outlet refrigerant guide tubes.

The conventional double rotary compressor as described above operates as follows.

That is, when the rotor 2b is rotated by applying power to the stator 2a of the power transmission mechanism 2, the rotating shaft 3 rotates together with the rotor 2b, and the rotational force of the power transmission mechanism 2 is firstly increased. The rolling pistons 14 and 23 are eccentrically rotated in each of the cylinders 11 and 21 so as to be transmitted to the compression mechanism 10 and the second compression mechanism 20 so that the refrigerant gas flows into the upper cylinder 11. ) Is alternately sucked into each suction space through the first refrigerant suction pipe SP1 and the second refrigerant suction pipe SP2 connected to the lower cylinder 21 and then compressed to a predetermined pressure to discharge each discharge port 12a, 22a. Through a series of processes are alternately discharged into the casing (1) through.

In this discharging process, an upper discharge port 12a, an upper discharge valve 15 (and retainer), and an upper muffler 16 are required for the upper cylinder 11, and the lower discharge port 22a is provided for the lower cylinder 21. ), Bottom discharge valve 24 (and retainer) and bottom muffler 25 are required.

In this manner, a separate discharge structure is provided in each of the cylinders 11 and 21 to force the overlapping of components, in particular, the muffler 16 and 25, the discharge valves 15 and 24, and the retainer.

As a result, it is one of the factors that reduce the productivity and economic efficiency of the overall compressor by complicating the waste of materials and manufacturing work, and there is a need for improvement.

 In order to meet the above needs, the present invention provides a shared discharge structure of a double rotary compressor that improves the economics of the compressor by forming a common discharge structure that can be shared by the upper and lower cylinders. do.

In order to achieve the above object, the present invention provides a plurality of cylinders arranged in the axial direction in the casing to form a plurality of compression spaces, and at least partitioning the plurality of compression spaces between the adjacently arranged cylinders. A double rotary compressor comprising at least one intermediate bearing and a plurality of outer bearings covering the opening side of the cylinders arranged outside to form a compression space together with each cylinder, comprising: a plotter; A plotter channel formed on the plotter intermediate bearing so that the plotter is disposed therein; It is formed in the upper cylinder and the lower cylinder disposed above and below the middle of the plotter, respectively, and connected to the plotter channel to the floater moving in the plotter channel by the force of the compressed gas discharged from the upper cylinder and the lower cylinder Upper and lower discharge channels that are opened and closed by; And a refrigerant discharge channel connecting the plotter channel and the muffler to communicate with each other, and guiding the refrigerant gas discharged alternately from the upper and lower cylinders to the muffler according to the movement of the plotter.

Here, the plotter channel is formed along the thickness direction of the plotter middle bearing so as to be parallel to the axis of rotation of the compressor, the upper and lower discharge channels are respectively cut in the inner lower corner of the upper cylinder and the inner upper corner of the lower cylinder. It may be formed by.

In addition, the plotter channel may be formed to have a polygonal cross section, and the plotter may be formed to have a cross-sectional shape corresponding to the cross-sectional shape of the plotter channel, and thus may have a quadrangular or circle shape. .

The double rotary compressor has two cylinders consisting of the upper cylinder and the lower cylinder, a plotter intermediate bearing disposed between them, and an upper bearing and a lower bearing disposed as the outer bearing on the outside thereof, and the refrigerant The discharge channel may be in communication with the muffler which is opened on the upper side of the upper bearing by sequentially passing through the middle plotter, the upper cylinder, and the upper bearing formed in the plotter channel.

Further, the upper and lower portions of the plotter is preferably formed as a soft material compared to the central portion.

Furthermore, the refrigerant discharge channel is preferably formed such that an enlarged portion having an increased cross sectional area and a reduced portion having a reduced cross sectional area are alternately arranged.

Hereinafter, the shared discharge structure of the double rotary compressor according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a cross-sectional view showing only the compression mechanism side to explain the shared discharge structure of the double rotary compressor according to an embodiment of the present invention, Figure 4 is an enlarged cross-sectional view of the discharge structure portion of FIG.

Hereinafter, as illustrated in FIG. 3, the upper cylinder 111 and the lower cylinder connected to the rotating shaft 3 as two cylinders and arranged up and down as well as the rotating shaft 3 disposed inside the casing 1. A double rotary compressor having 121 is described as an example.

However, the present invention is not limited to such a double rotary compressor having two cylinders, but can also be applied to a double rotary compressor having three or more cylinders. This will be discussed in more detail at the end.

Returning to the double rotary compressor having only two cylinders again, the intermediate plotter 113 is arranged between the upper cylinder 111 and the lower cylinder 121 as an intermediate bearing. In addition, the outer bearing for covering the outer side of the upper cylinder 111 and the lower cylinder 121, the lower bearing to cover the lower side of the upper bearing 112 and the lower cylinder 121 arranged on the upper side of the upper cylinder 111. 122 is provided. Furthermore, a muffler 116 is installed at the top of the upper bearing 112 to simultaneously surround the rotating shaft 3.

In the discharge structure according to the present invention, the refrigerant gas discharged from two adjacent cylinders is discharged through one shareable discharge structure, and is largely divided into a plotter 200, a plotter channel 210, and a refrigerant discharge channel 300. Explain.

First, the plotter channel 210 is formed in the plotter intermediate bearing 113, and the plotter 200 is inserted to be movable therein. Furthermore, the plotter channel 210 is formed in parallel with the rotation axis 3 along the thickness direction of the plotter intermediate bearing 113.

The upper discharge channel 220 and the lower discharge channel 230 cut the inner lower edge side and the inner upper edge side of the upper cylinder 111 and the lower cylinder 121 so as to communicate with the upper and lower portions of the plotter channel 210, respectively. It is formed as a form. Accordingly, the plotter channel 210 is positioned on a straight line connecting the inner ends of the upper cylinder 111 and the lower cylinder 121.

The refrigerant discharge channel 300 extends from the plotter intermediate bearing 113 to pass through the upper cylinder 111 and the upper bearing 112 in order to communicate the plotter channel 210 and the muffler 116.

Here, referring to FIG. 4, which is an enlarged view, the portion of the refrigerant discharge channel 300 communicating with the plotter channel 210 blocks the lower discharge channel 230 formed in the lower cylinder 121. It should be formed wide enough to ensure a flow path through which the refrigerant gas discharged from the upper cylinder 111 can be smoothly escaped by the upper end of the.

Looking at the effect by the configuration as described above are as follows.

An eccentric portion of the upper rolling piston 114 that rotates in the upper cylinder 111 and the lower rolling piston 123 that rotates in the lower cylinder 121 is disposed to have a 180 ° difference. For this reason, when the refrigerant gas introduced through the first refrigerant suction pipe SP1 of the discharge structure side portion of the first internal space V1 of the upper cylinder 111 is compressed, the second internal space of the lower cylinder 111 is compressed. The refrigerant gas introduced through the second refrigerant suction pipe SP2 in the discharge structure side portion of V2 is in an uncompressed state.

Accordingly, the pressure of the refrigerant gas in the upper discharge channel 220 forms a pressure that is relatively higher than the pressure of the refrigerant gas in the lower discharge channel 230. This pressure difference acts on the plotter 200 disposed in the plotter channel 210 in communication with the upper discharge channel 220 and the lower discharge channel 230. As a result, the plotter 200 blocks the lower discharge channel 230 side to prevent the refrigerant gas from coming out, and simultaneously opens the upper discharge channel 220 to flow the refrigerant gas compressed in the upper cylinder 111 (F1). ) Is discharged to the muffler 116 through the refrigerant discharge channel 300 (see the state shown in Figure 4).

When the rotating shaft 3 is further rotated 180 °, the refrigerant gas on the discharge structure side of the lower cylinder 121 is at a higher pressure than the refrigerant gas on the discharge structure side of the upper cylinder 111 at this time. Accordingly, the plotter 200 moves to the upper cylinder 111 side by the pressure difference to block the upper discharge channel 220. In the meantime, the compressed refrigerant gas of the lower cylinder 121 passes through the plotter channel 210 and the refrigerant discharge channel 300 to the flow F2 discharged to the muffler 116 (see FIG. 5, in particular, the flow ( F2)}.

As a result, the discharge valve, the retainer, or the like may not be used in duplicate as compared with the case where a separate discharge port is formed in each cylinder. In particular, one muffler is sufficient without providing two mufflers up and down.

As illustrated above, the refrigerant discharge channel 400 according to the present invention extends through the plotter intermediate bearing 113, the upper cylinder 111 and the upper bearing 112, only the conventional upper bearing 12 The length is longer than that of the discharge port 12a (see FIG. 2 again).

In view of the above, the present inventors propose a structure in which the refrigerant discharge channel itself is provided with a function of a muffler.

FIG. 5 is an enlarged cross-sectional view illustrating another embodiment of the discharge channel of FIG. 3 and illustrates a structure capable of performing such a muffler function.

The refrigerant discharge channel 400 according to another embodiment of the present invention has a configuration in which a reduction portion 410 having a reduced cross sectional area and an enlarged portion 420 having an increased cross sectional area are alternately formed. The extent of such enlargement and reduction, in particular, enlargement is determined within a range that does not impair the strength of the plotter intermediate bearing 113, the upper cylinder 111 and the upper bearing 112 in which the enlarged portion 420 is formed. Furthermore, since the enlarged portion 420 is relatively enlarged with respect to the reduced portion 410, a large cross-sectional area is not necessarily required.

According to the refrigerant discharge channel 400, the discharged refrigerant gas partially loses flow energy due to eddy currents generated while repeatedly passing through the reduction part 410 and the expansion part 420. Accordingly, there is an advantage that the function of the muffler 116 to reduce noise can be partially achieved in the refrigerant discharge channel 400.

Next, referring to FIG. 6, a plotter moving in the plotter channel will be described in detail with reference to the above description.

FIG. 6 is a perspective view illustrating an exemplary embodiment of the plotter of FIG. 3. FIG.

As illustrated in FIG. 6 (a) or 6 (b), the plotters 500 and 600 are volumetric bodies extending with a polygonal cross section, in particular a square 500 or circular 600 cross section. In this case, the plotter channel 210 is formed to have a polygonal cross section such as a quadrangle or a circle in correspondence with the plotters 500 and 600.

Further, the plotters 500 and 600 are formed of a rigid body having upper and lower portions 520 and 620 of a softer material than the central portions 510 and 610. By forming the upper and lower portions 520 and 620 in a softer material than the center portions 510 and 610, the plotters 500 and 600 can more firmly seal the upper discharge channel 220 and the lower discharge channel 230. Furthermore, there is an advantage in that noise generated when colliding to prevent the upper discharge channel 220 and the lower discharge channel 230 may be reduced.

In the above description, the case of two cylinders (upper cylinder 111 and lower cylinder 121) has been described as an example. However, the discharge structure according to the present invention, as briefly mentioned above, has a double rotary having three or more cylinders. The same applies to the compressor.

For example, in the case of three odd numbers of cylinders, two of the cylinder pairs may be provided with a shared discharge structure as in the present invention, and a separate discharge port may be formed in one remaining cylinder.

Further, when four or more cylinders are arranged in even numbers, each of the two cylinders may be bundled in a pair so that each of them has a discharge structure according to the present invention which can be shared. Although a detailed description thereof will be omitted, it will be readily understood by those skilled in the art having sufficient knowledge of the above description.

As described above, in the shared discharge structure of the double rotary compressor according to the present invention, it is possible to reduce the economical efficiency and productivity of the compressor by eliminating the dual use of the components and the waste of the manufacturing process due to the double discharge port for each cylinder. Improve.

Furthermore, as the muffler functions as a part of the refrigerant discharge channel itself through which the refrigerant gas is discharged, the noise caused by the discharge gas of the compressor can be further reduced.

Claims (7)

At least one intermediate bearing arranged in the casing in the axial direction to form a plurality of compressed spaces, at least one intermediate bearing partitioning the plurality of compressed spaces between adjacent cylinders, and a cylinder disposed outside A double rotary compressor including a plurality of outer bearings which cover an opening side of the and forms a compression space together with each cylinder, A plotter; A plotter channel formed on the plotter intermediate bearing so that the plotter is disposed therein; It is formed in the upper cylinder and the lower cylinder disposed above and below the middle of the plotter, respectively, and connected to the plotter channel to the floater moving in the plotter channel by the force of the compressed gas discharged from the upper cylinder and the lower cylinder Upper and lower discharge channels that are opened and closed by; The shared discharge structure of the double rotary compressor comprising a refrigerant discharge channel connecting the plotter channel and the muffler in communication and guiding the refrigerant gas discharged alternately from the upper and lower cylinders to the muffler according to the movement of the plotter. . The method of claim 1, The plotter channel is formed along the thickness direction of the plotter intermediate bearing to be parallel to the axis of rotation of the compressor, And the upper and lower discharge channels are formed by cutting the inner lower edge portion of the upper cylinder and the inner upper edge portion of the lower cylinder, respectively. The method of claim 2, The plotter channel is formed in a shape extending with a polygonal cross section, And the plotter is formed to have a cross-sectional shape corresponding to the cross-sectional shape of the plotter channel. The method of claim 3, The cross-sectional shape of the plotter channel and the plotter is a shared discharge structure of a double rotary compressor, characterized in that the shape of the square or circle. The method according to any one of claims 1 to 4, The double rotary compressor has two cylinders consisting of the upper cylinder and the lower cylinder, a plotter intermediate bearing disposed therebetween, and an upper bearing and a lower bearing disposed as the outer bearing outside thereof. The refrigerant discharging channel is assembled to the double rotary compressor, characterized in that through the plotter intermediate bearing formed in the plotter channel, the upper cylinder, and the upper bearing in order to communicate with the muffler covered on the upper side of the upper bearing. article. The method according to any one of claims 1 to 4, The upper and lower portions of the plotter are shared discharge structure of a double rotary compressor, characterized in that formed as a soft material than the central portion. The method according to any one of claims 1 to 4, The refrigerant discharge channel is a shared discharge structure of a double rotary compressor, characterized in that the enlarged portion is increased in cross-sectional area and the reduction portion is reduced in cross-section is arranged alternately.

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