JP2003166472A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor of internal low pressure type or internal middle pressure type which reduces the noise during operation and avoids shortage of the refrigerator oil in a sealed vessel. <P>SOLUTION: The compressor includes a rotary type compressing mechanism part 18 installed in the sealed vessel 12, and a muffler 171 furnished internally with a baffle plate 173 is attached to the outside of the vessel 12, and the inlet to the muffler is coupled with the discharge port of the compressing mechanism part through a refrigerant discharge pipe 96. The lower part of the muffler 171 is coupled with the vessel 12 through an oil returning pipe 174. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor for compressing a refrigerant in a refrigerating device such as an air conditioner, a water heater, a car air conditioner, a showcase, a refrigerator / freezer, and a vending machine.

[0002]

2. Description of the Related Art As a compressor of this type, for example, FIG.
An internal intermediate pressure type rotary two-stage compressor (hereinafter, simply referred to as a compressor) 10X shown in FIG. This compressor 10X
In the above, the electric mechanism portion 14 including the stator 22, the rotor 24 and the like is provided in the upper portion of the closed container 12, and
A two-stage rotary compression mechanism portion 18 connected to the rotor 24 of the electric mechanism portion 14 via the rotary shaft 16 is provided in the lower portion thereof.

In the two-stage rotary compression mechanism section 18 of the compressor 10X, the first compression mechanism section 32 is arranged on the lower side and the second compression mechanism section 34 is arranged on the upper side. ,
A gaseous refrigerant introduced from an accumulator (not shown) through the refrigerant introduction pipe 92 is compressed by the first compression mechanism section 32 on the lower stage side, the compressed refrigerant is discharged into the closed container 12, and the compressed refrigerant is introduced through the refrigerant introduction pipe 94. It is configured to be introduced into the second compression mechanism portion 34 of the second stage via the above, and further compressed there to a high pressure to supply the high pressure refrigerant from the refrigerant discharge pipe 96 to the refrigerant circuit of the air conditioner (not shown).

In this compressor 10X, a discharge muffling chamber 62 is provided in the first compression mechanism section 32, and a discharge muffling chamber 64 is provided in the second compression mechanism section 34 so that the compressor 10X compresses and discharges. The pulsation of the generated refrigerant is suppressed, thereby suppressing the vibration of the refrigerant discharge pipe 96 that extends to a gas cooler (not shown) and reducing noise.

However, since the discharge muffling chambers 62 and 64 are provided in the support members 54 and 56, there are many restrictions in both size and structure, and therefore, the pulsation of the compressed refrigerant is suppressed and the noise during operation is suppressed. There was a problem that it did not necessarily rise sufficiently.

Further, the refrigerating machine oil 190 stored in the bottom portion of the closed container 12 and used for lubricating the sliding portion of the rotary compression mechanism portion 18 and improving the airtightness is the second compression mechanism portion 3.
There is also a problem in that a large amount of the refrigerant is discharged out of the container together with the refrigerant discharged from the refrigerant discharge pipe 96 after being compressed by 4, and the refrigerating machine oil 190 in the hermetically sealed container 12 runs short.

[0007]

Therefore, it is possible to provide a compressor in which the pulsation of the compressed refrigerant can be suppressed to effectively reduce the noise during operation, and the refrigerating machine oil in the container is unlikely to run short. It was necessary, and that was a problem to be solved.

[0008]

In order to solve the above-mentioned problems of the prior art, the present invention relates to a refrigerant compressed by a compression mechanism portion provided in a container, at least for a refrigerant compressed by the final step of the compression mechanism portion. In an internal low pressure or internal intermediate pressure type compressor that directly discharges to the outside of the container without discharging into the container, a muffler is provided outside the container, and the muffler inlet and the final process discharge port of the compression mechanism part are connected by a refrigerant pipe, A compressor having a first structure in which a lower part of the muffler and the container are connected by an oil return pipe;

In the compressor having the first structure, a compressor having a second structure in which carbon dioxide is used as a refrigerant,
Is provided.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIG.
~ It demonstrates in detail based on FIG. In addition, in order to facilitate understanding, in these drawings, the same reference numerals are given to the parts having the same functions as the parts described in FIG.

FIG. 1 is a longitudinal sectional view of an internal intermediate pressure type two-stage compression type compressor 10 provided with first and second compression mechanism portions 32 and 34 as an embodiment of a rotary compressor of the present invention. 2 is a front view of the compressor 10, FIG. 3 is a side view of the compressor 10, and FIG.
Is another vertical cross-sectional view of the compressor 10, and FIG.
6 is a plan sectional view of the electric mechanism portion 14 of the compressor 10, and FIG. 7 is an enlarged sectional view of the rotary compression mechanism portion 18 of the compressor 10.

The compressor 10 has a cylindrical hermetic container 12 made of a steel plate, an electric mechanism portion 14 arranged and housed above the inner space of the hermetic container 12, and the electric mechanism portion 14.
The first compression mechanism portion 32 (first stage), which is arranged on the lower side and is driven by the rotating shaft 16 of the electric mechanism portion 14, and the second compression mechanism portion 34 (second stage) which is arranged above it. ).

The height dimension of the compressor 10 of the embodiment is 220 m.
m (outer diameter 120 mm), the height dimension of the electric mechanism section 14 is about 80 mm (outer diameter 110 mm), the height dimension of the rotary compression mechanism section 18 is about 70 mm (outer diameter 110 mm), and it rotates with the electric mechanism section 14. The distance from the expression compression mechanism 18 is about 5 mm. Further, the excluded volume of the second compression mechanism section 34 is designed to be smaller than the excluded volume of the first compression mechanism section 32.

The closed container 12 has a thickness of 4.5 mm in the embodiment.
A cylindrical container body 12A formed of a steel plate of which the bottom portion is an oil storage portion for storing the refrigerating machine oil 190, and which houses the electric mechanism portion 14 and the rotary compression mechanism portion 18, and the container body 12
And a substantially bowl-shaped end cap (lid) 12B for closing the upper opening of A, and this end cap 1
A circular mounting hole 12D is formed in the center of the upper surface of 2B, and a terminal (wiring is omitted) 20 for supplying electric power to the electric mechanism unit 14 is mounted in the mounting hole 12D.

In this case, the end cap 12B around the terminal 20 is formed with a step portion 12C having a predetermined curvature in an annular shape by press forming. Also, Terminal 2
Reference numeral 0 denotes a circular glass portion 20A to which the electrical terminal 139 is attached and is attached, and a metal attaching portion 20 formed around the glass portion 20A and protruding obliquely outward and downward to form a brim.
It is composed of B and. The thickness of the mounting portion 20B is 2.4 ± 0.5 mm. Then, in the terminal 20, the glass portion 20A is inserted from the lower side into the mounting hole 12D so as to face the upper side, and the mounting portion 20B is brought into contact with the peripheral edge of the mounting hole 12D, and the peripheral edge of the mounting hole 12D of the end cap 12B. It is fixed to the end cap 12B by welding the mounting portion 20B to.

The electric mechanism section 14 is a stator 22 mounted in an annular shape along the inner peripheral surface of the upper space of the closed container 12.
And a rotor 24 inserted and arranged inside the stator 22 with a slight gap. The rotor 24 is fixed to the rotating shaft 16 that extends vertically through the center.

The stator 22 includes a laminated body 26 in which donut-shaped electromagnetic steel sheets are laminated, and a stator coil 28 wound around the teeth of the laminated body 26 by a direct winding (concentrated winding) method.
(FIG. 6). In addition, the rotor 24 is also the stator 2
Similar to the second example, it is formed of a laminated body 30 of electromagnetic steel plates, and a permanent magnet 31 is inserted into the laminated body 30.

An intermediate partition plate 36 is sandwiched between the first compression mechanism section 32 and the second compression mechanism section 34. That is, the first compression mechanism section 32 and the second compression mechanism section 34.
Is an intermediate partition plate 36, cylinders 38 and 40 arranged below and above the intermediate partition plate 36, and the cylinder 3 thereof.
8 and 40, eccentric parts 42 and 44 provided on the rotary shaft 16 with a phase difference of 180 degrees, rollers 46 and 48 fitted to the eccentric parts 42 and 44 and eccentrically rotated, and the roller 4 thereof.
The vane 50 that abuts on the cylinders 6 and 48 to divide the cylinders 38 and 40 into the low-pressure chamber side and the high-pressure chamber side, respectively, and closes the lower opening surface of the cylinder 38 and the upper opening surface of the cylinder 40 for rotation. It is composed of a lower support member 54 and an upper support member 56 as a shaft support member which also serves as a bearing for the shaft 16.

Lower support member 54 and upper support member 56
Through the suction ports 161, 162 to the cylinder 38,
Suction passages 58, 60 that communicate with the interior of 40,
The recessed discharge muffling chambers 62 and 64 are formed, and the openings of both of the discharge muffling chambers 62 and 64 are closed by covers. That is, the discharge muffling chamber 62 is closed by the lower cover 66, and the discharge muffling chamber 64 is closed by the upper cover 68.

A bearing 54A is formed through the center of the lower support member 54, and a cylindrical bush 122 is attached to the inner surface of the bearing 54A. Further, a bearing 56A is formed upright in the center of the upper support member 56, and the cylindrical bush 123 is also formed on the inner surface of the bearing 56A.
Is installed. These bushes 122, 123 are made of a material having a small frictional resistance,
Through these bushes 122 and 123, the bearing 54A of the lower support member 54 and the bearing 56A of the upper support member 56.
Held by and.

In this case, the lower cover 66 is formed of a donut-shaped circular steel plate, and four main bolts 129 are provided at four peripheral portions from below to the lower support member 5.
4 and the discharge port 39 closes the lower surface opening of the discharge muffling chamber 62 which communicates with the inside of the cylinder 38 of the first compression mechanism portion 32. The tip of the main bolt 129 is screwed into the upper support member 56. The inner peripheral edge of the lower cover 66 projects inward from the inner surface of the bearing 54A of the lower support member 54, whereby the lower end surface of the bush 122 is held by the lower cover 66 and prevented from falling off (FIG. 9). FIG. 10 shows the lower surface of the lower support member 54,
Reference numeral 127 is a mounting groove of the discharge valve of the first compression mechanism portion 32 that opens and closes the discharge port 39 in the discharge muffling chamber 62.

The lower support member 54 is made of a ferrous sintered material (or a casting), and the lower cover 6
The surface (lower surface) on which 6 is attached is processed to have a flatness of 0.1 mm or less and then subjected to steam treatment. By this steam treatment, the surface on the side where the lower cover 66 is attached becomes iron oxide, so that the holes inside the sintered material are closed and the sealing performance is improved. This eliminates the need to provide a gasket between the lower cover 66 and the lower support member 54.

The discharge muffling chamber 62 and the electric mechanism portion 14 side of the upper cover 68 in the closed container 12 are communicated with each other by a communication passage 63 which is a hole penetrating the cylinders 38, 40 and the intermediate partition plate 36 ( (Fig. 4). In this case, an intermediate discharge pipe 121 is provided upright on the upper end of the communication passage 63, and the intermediate discharge pipe 121 is a gap between adjacent stator coils 28 wound around the stator 22 of the electric mechanism section 14 above. (Fig. 6).

Further, the upper cover 68 closes the upper opening of the discharge muffling chamber 64 which communicates with the inside of the cylinder 40 of the second compression mechanism portion 34 by the discharge port 41, and the closed container 12 is closed.
The interior is divided into the discharge muffling chamber 64 and the electric mechanism section 14 side. As shown in FIG. 12, the upper cover 68 has a thickness of 2 mm or more and 10 mm or less (the most preferable 6 mm in the embodiment), and the bearing 56A of the upper support member 56.
Is formed from a circular doughnut-shaped steel plate having a hole formed therethrough, and a gasket 124 with a bead is sandwiched between the upper support member 56 and the peripheral portion of the gasket 124 with the beaded gasket 124 interposed therebetween. The main bolt 78 of the book fixes the upper support member 56 from above. The tip of the main bolt 78 is screwed into the lower support member 54.

By making the upper cover 68 to have such a thickness dimension, the upper cover 68 can sufficiently withstand the pressure of the discharge muffling chamber 64, which is higher than the pressure inside the closed container 12, and can be downsized, and can be insulated from the electric mechanism unit 14. You will also be able to secure a distance.
Further, an O-ring 126 is provided between the inner peripheral edge of the upper cover 68 and the outer surface of the bearing 56A (FIG. 1).
2). By sealing the bearing 56A side with the O-ring 126, it is possible to sufficiently seal the inner peripheral edge of the upper cover 68 and prevent gas leakage.
The volume of the discharge muffling chamber 64 can be increased, and it is not necessary to fix the inner peripheral edge of the upper cover 68 to the bearing 56A with an O-ring. In FIG. 11, reference numeral 128 is a mounting groove of the discharge valve of the second compression mechanism portion 34 that opens and closes the discharge port 41 in the discharge muffling chamber 64.

The cylinder 40 is provided in the intermediate partition plate 36 that closes the upper opening surface of the cylinder 38 of the first compression mechanism portion 32 and the lower opening surface of the cylinder 40 of the second compression mechanism portion 34. 13 and 14 at a position corresponding to the suction side inside.
As shown in FIG. 4, a through hole 131 is formed from the outer peripheral surface to the inner peripheral surface, and the outer peripheral surface and the inner peripheral surface are communicated with each other to form an oil supply passage. Stopping material 132
The opening on the outer peripheral surface side is sealed by, for example, press-fitting. Further, a communication hole 133 extending upward from the middle part of the through hole 131 is formed.

On the other hand, the suction port 162 of the cylinder 40
A communication hole 134 that communicates with the communication hole 133 of the intermediate partition plate 36 is formed on the (suction side). Further, as shown in FIG. 7, the oil hole 8 in the vertical direction is provided in the rotary shaft 16 about the center of the shaft.
0 and the lateral oil supply hole 8 communicating with the oil hole 80.
1, 82 are provided, and the through hole 1 of the intermediate partition plate 36 is provided.
The opening on the inner peripheral surface side of 31 communicates with the oil hole 80 via these oil supply holes 81, 82.

The eccentric portions 42 and 44 of the rotary shaft 16 are also provided with oil supply holes 83 and 84 which communicate with the oil hole 80. A groove portion in the axial direction and a groove portion in the circumferential direction intersecting the groove portion are provided in the portion where the oil supply holes 83 and 84 are opened.

That is, an axial groove portion 43A and a circumferential groove portion 43B intersecting the groove portion 43A are provided in the portion where the oil supply hole 83 is opened, and the axial portion is provided in the portion where the oil supply hole 84 is opened. Direction groove portion 45A and the groove portion 45
A circumferential groove portion 45B intersecting with A is provided.

Therefore, the oil is pumped up from the bottom of the closed container 12 through the oil hole 80 of the rotary shaft 16, for example, the second
The refrigerating machine oil 190 discharged from the oil supply hole 84 of the eccentric portion 44 of the compression mechanism portion 34 and entering the groove portion 45B on the opposite side to the rotating direction of the rotating shaft 16 rotating at high speed is rotated by the rotating shaft 1
As it is left behind from the terminal end of the groove portion 45B with the rotation of 6, it is easier to enter the circumferential direction between the outer circumferential surface of the eccentric portion 44 of the rotary shaft 16 and the inner circumferential surface of the roller 48, as if left behind. The rotating load is large, so that the eccentric portion 4 of the rotating shaft 16
4 and the roller 48 attached to the eccentric portion 44 slide in the contact state even if they slide in close contact with each other to effectively lubricate the eccentric portion 44 of the rotating shaft 16 and the roller 48 ( The eccentric part 42 of the first compression mechanism part 32 with a small rotational load
The refrigerating machine oil 190 discharged from the oil supply hole 83 of (1) also acts similarly.

Further, since the inside pressure of the closed container 12 during operation becomes an intermediate pressure, it becomes difficult to supply the refrigerating machine oil 190 into the cylinder 40 which becomes a high pressure due to the second stage compression, but the intermediate partition plate. With the configuration of 36 described above, the closed container 1
2 Refrigerating machine oil 190 pumped up from the oil storage section at the inner bottom part, raised in the oil hole 80, and discharged from the oil supply holes 81 and 82.
Enters the through hole 131 of the intermediate partition plate 36, and the communication hole 13
3,134 to the suction side of the cylinder 40 (suction port 16
It is supplied to 2) and used for lubrication of sliding parts.

In FIG. 16, L is the second compression mechanism section 3
4 shows the pressure fluctuation on the suction side of the cylinder 40, and P1 shows the pressure on the inner peripheral surface of the intermediate partition plate 36. As indicated by L1 in this figure, the pressure on the suction side of the cylinder 40 (suction pressure) is
In the suction process, the pressure on the inner peripheral surface side of the intermediate partition plate 36 becomes lower than the pressure due to the suction pressure loss. Intermediate partition 3 during this period
Oil is supplied into the cylinder 40 from the through hole 131 and the communication hole 133 of No. 6 through the communication hole 134 of the cylinder 40.

As described above, the cylinders 38, 40, the intermediate partition plate 36, the support members 54, 56 and the covers 66, 6 are provided.
8 are fastened from above and below by four main bolts 78 and a main bolt 129, respectively.
0, the intermediate partition plate 36, and the support members 54 and 56 are auxiliary bolts 136 located outside these main bolts 78 and 129.
(Fig. 4). The auxiliary bolt 136 is inserted from the upper support member 56 side, and the tip end thereof is the lower support member 54.
It is screwed to.

The auxiliary bolt 136 is located near the vane slot 70, which will be described later, of the vane 50. By thus adding the auxiliary bolt 136 and integrating the rotary compression mechanism portion 18 with each other, it is possible to ensure the sealing property against the extremely high pressure inside and to secure the vicinity of the vane slot 70 of the vane 50. Because it tightens
It also becomes possible to prevent leakage of high-pressure back pressure applied to the vane 50.

On the other hand, the vane 50 is provided in the cylinder 40.
And a spring 76 as a spring member located outside the vane slot 70.
A storage portion 70A for storing is stored. The storage portion 70A is open to the vane slot 70 side and the closed container 12 (container body 12A) side (FIG. 8). The spring 76 is in contact with the outer end of the vane 50 and is constantly in contact with the vane 50.
Is urged toward the roller 48 side. And this spring 7
6, a metal plug 137 is provided in the housing portion 70A on the side of the closed container 12 and serves to prevent the spring 76 from coming off.

In this case, the outer size of the plug 137 is the storage portion 7.
The plug 137 is set to be smaller than the inner dimension of 0A, and is inserted into the accommodating portion 70A by a clearance fit. Further, an O-ring 138 for sealing between the plug 137 and the inner surface of the housing portion 70A is attached to the peripheral surface of the plug 137. The outer end of the cylinder 40, that is, the distance between the outer end of the storage portion 70A and the container body 12A of the closed container 12 is determined by the O-ring 138 to the closed container 12 of the plug 137.
It is set smaller than the distance to the end on the side. Then, a high pressure, which is the discharge pressure of the second compression mechanism portion 34, is applied as a back pressure to a back pressure chamber (not shown) communicating with the vane slot 70 of the vane 50. Therefore, the spring 76 side of the plug 137 has a high pressure, and the closed container 12 side has an intermediate pressure.

Due to the above dimensional relationship, the plug 1
As in the case where 37 is press-fitted and fixed in the housing portion 70A, the cylinder 40 is deformed and the sealing performance between the cylinder 40 and the upper support member 56 is reduced, so that it is possible to avoid the inconvenience that causes performance deterioration. Become. Even with such clearance fitting, the space between the cylinder 40 and the hermetically sealed container 12 is set to the O-ring 1.
Since it is set to be smaller than the distance from 38 to the end of the plug 137 on the closed container 12 side, the plug 137 is moved in the direction pushed out from the storage section 70A by the high pressure on the spring 76 side (back pressure of the vane 50). However, the O-ring 1 still remains when the movement is blocked by coming into contact with the closed container 12.
Since 38 is positioned and sealed in the storage portion 70A, there is no problem in the function of the plug 138.

By the way, the connecting portion 90 which connects the eccentric portions 42 and 44 integrally formed with the rotary shaft 16 with a phase difference of 180 degrees has a cross-sectional shape cut from the circular cross-section of the rotary shaft 16. In order to increase the area and provide rigidity, it has a non-circular shape, for example, a rugby ball shape (see FIG. 1).
7). That is, the eccentric portions 42, 44 provided on the rotating shaft 16
The cross-sectional shape of the connecting portion 90 that connects the two is thicker in the direction orthogonal to the eccentric direction of the eccentric portions 42 and 44 (hatched portion in the figure).

As a result, the cross-sectional area of the connecting portion 90 connecting the eccentric portions 42 and 44 integrally provided adjacent to the rotary shaft 16 is increased, and the second moment of area is increased to increase strength (rigidity) and durability. It improves the reliability and reliability. Particularly when two-stage compression of a refrigerant having a high working pressure is performed, the load acting on the rotary shaft 16 increases due to a large pressure difference between high pressure and low pressure, but the cross-sectional area of the connecting portion 90 is increased to increase its strength (rigidity).
Therefore, the rotation shaft 16 is prevented from being elastically deformed.

In this case, the center of the lower eccentric portion 42 is O1.
And the center of the upper eccentric portion 44 is O2, the center of the arc of the surface of the coupling portion 90 on the eccentric direction side of the eccentric portion 42 is O.
1, the center of the arc of the surface of the connecting portion 90 on the eccentric direction side of the eccentric portion 44 is O2. Accordingly, when the rotary shaft 16 is fixed to the cutting machine and the eccentric portions 42 and 44 and the connecting portion 90 are cut, the eccentric portion 42 is processed, and then only the radius is changed to process one surface of the connecting portion 90. Then, it is possible to change the fixing position to process the other surface of the connecting portion 90 and change only the radius to process the eccentric portion 44. As a result, the number of times the rotary shaft 16 is re-fixed is reduced, and the productivity is significantly improved.

On the curved side surface of the container body 12A of the closed container 12, the suction passages 58 and 60 of the lower support member 54 and the upper support member 56, the discharge muffling chamber 64 and the upper cover 68 (at the lower end of the electric mechanism portion 14). Cylindrical sleeves 141 to 144 are welded and fixed to positions corresponding to (substantially corresponding positions). The sleeve 142 is substantially the same as the sleeve 141.
The sleeve 143 is provided at a position shifted by 0 degrees, the sleeve 143 is provided above the sleeve 141, and the sleeve 144 is provided in the sleeve 1.
It is provided at a position substantially facing 41.

Then, one end of a refrigerant introducing pipe 92 for introducing a refrigerant gas into the cylinder 38 of the first compression mechanism portion 32 is inserted and connected in the sleeve 141, and one end of the refrigerant introducing pipe 92 is connected to the cylinder 38. It communicates with the suction passage 58. The other end of the refrigerant introducing pipe 92 has the accumulator 20.
4 is connected to the lower end.

Further, one end of a refrigerant introducing pipe 94 for introducing a refrigerant gas into the cylinder 40 of the second compression mechanism portion 34 is inserted and connected in the sleeve 143.
One end of 4 is communicated with the suction passage 60 of the cylinder 40. The refrigerant introducing pipe 94 extends from the sleeve 142 passing through the upper side of the closed container 12 and has the other end at the sleeve 142.
It is inserted and connected inside and communicates with the inside of the closed container 12. Further, one end is connected to the inlet of the muffler 171 in the sleeve 144, and the other end of the refrigerant discharge pipe 96 serving as a high-pressure pipe line is inserted and connected. One end of the refrigerant discharge pipe 96 is connected to the discharge muffling chamber 6
It is connected to 4.

The muffler 171 includes a bracket 148 on the side of the closed container 12 welded and fixed to the middle side surface of the container body 12A of the closed container 12 and a bracket 1 on the side of the muffler 171.
It is installed on the side of the closed container 12 via, for example, 72. Inside the muffler 171, a plurality of baffles 173 are provided.
Is installed so that the pulsation of the compressed refrigerant flowing in through the short refrigerant discharge pipe 96 is promptly smoothed. Further, the bottom of the muffler 171 and the bottom of the closed container 12 are connected by an oil return pipe 174 having a small inner diameter, flow into the muffler 171 together with the compressed refrigerant, and the baffle plate 173 is used when the course is changed by the baffle plate 173. Touch the to slow down the refrigerator oil 190 accumulated at the bottom and close the container 1
It can be returned to 2.

As described above, in the compressor 10 of the present invention, since the muffler 171 is attached to the outside of the closed container 12, the muffler 171 has a sufficient size, and
A sufficient number of baffle plates 173 can also be installed to effectively suppress the pulsation of the refrigerant that is compressed into the predetermined pressure by the first and second compression mechanism portions 32 and 34 and flows in. Therefore, vibration of the refrigerant pipe connected to the discharge port of the muffler 171 and guiding the compressed refrigerant to the gas cooler can be suppressed, and noise can be prevented. Further, the refrigerating machine oil 190 separated from the refrigerant by the muffler 171 attached to the outer wall portion of the closed container 12 and accumulated at the bottom is promptly returned to the closed container 12 via the short oil return pipe 174 to be replenished.
There is no shortage of the refrigerator oil 190 inside.

The accumulator 204 is a tank for separating the suction refrigerant into gas and liquid, and is a container body 12A of the closed container 12.
The bracket 147 on the closed container 12 side, which is welded and fixed to the upper side surface of the bracket, is attached to the bracket 205 on the accumulator 204 side.
It is installed on the side of the closed container 12 via the.

A refrigerant introducing pipe 92 inserted and connected to the sleeve 141, and a refrigerant introducing pipe 94 inserted and connected to the sleeve 143.
Are routed to opposite sides in the vicinity of the sleeves 141 and 143. That is, as shown in FIG. 3, the refrigerant introduction pipe 92 extending from the accumulator 204 bends to the right in the drawing to reach the sleeve 141, and the other refrigerant introduction pipe 94 bends to the left in the drawing to reach the sleeve 143. Even if the vertical dimension of the accumulator 204 is expanded to increase the volume, the refrigerant introduction pipe 9
2, 94 do not interfere with each other.

A thread groove 151 is formed on the outer peripheral portion of the sleeve 141, and the sleeves 142, 143, 1
A collar portion 152 is formed on the outer peripheral portion of 44. A connector for connecting the airtight test pipe can be screwed into the thread groove 151, and a coupler for connecting the airtight test pipe can be detachably engaged with the flange portion 152.

With such a structure, the airtight test pipe from the compressed air generating device (not shown) can be easily connected by using a coupler or a connector, so that the airtight test can be completed in a short time. Will be able to. In particular, sleeves 141 and 143 that are vertically adjacent to each other
Since the thread groove 151 is formed in the one sleeve 141 and the flange portion 152 is formed in the other sleeve 143, there is no situation where two couplers having a size larger than that of the connector are adjacently mounted. Sleeves 141 and 1
Even when the interval of 43 is narrow, the airtight test pipe can be connected to the sleeves 141 and 143 by utilizing the narrow space.

As a refrigerant of the compressor 10, carbon dioxide (an example of carbon dioxide gas which is a natural refrigerant), which satisfies the requirements of being environmentally friendly, nonflammable and nontoxic, CO ₂ ) is used, and as the refrigerating machine oil 190 as a lubricating oil, existing oils such as mineral oil (mineral oil), alkylbenzene oil, ether oil and ester oil are used.

The compressor 10 having the above structure shown in the embodiment is
For example, it is used in a refrigerant circuit of a vehicle-mounted cooling device 200 as shown in FIG. That is, the muffler 1 of the compressor 10
The discharge port 71 is connected to the inlet of a gas cooler 201 such as an air-cooled type. Then, the refrigerant pipe exiting the gas cooler 201 passes through an expansion valve 202 as a pressure reducing device, and then an evaporator 203.
Is connected to the inlet of the evaporator 203 and the outlet of the evaporator 203 is connected to the refrigerant introduction pipe 9
2 are connected. Note that in FIG. 18, the accumulator 20
4 is omitted.

Next, the operation of the cooling device 200 shown in FIG. 18 will be described. The stator coil 2 of the electric mechanism unit 14 via the terminal 20 of the compressor 10 and wiring not shown.
8 is energized, the electric mechanism unit 14 is activated and the rotor 24
Rotates. By this rotation, the rollers 46 and 48 fitted to the eccentric portions 42 and 44 integrally provided with the rotating shaft 16 are eccentrically rotated in the cylinders 38 and 40.

Therefore, the low pressure (first stage suction pressure LP: 4 MPaG) sucked from the suction port 161 to the low pressure chamber side of the cylinder 38 via the suction passage 58 formed in the refrigerant introduction pipe 92 and the lower support member 54. The refrigerant gas is compressed by the operation of the roller 46 and the vane 50, and the intermediate pressure (M
P1: 8 MPaG), and is discharged from the high-pressure chamber side of the cylinder 38 into the closed container 12 from the discharge port 39, the discharge muffling chamber 62 formed in the lower support member 54, the communication passage 63, and the intermediate discharge pipe 121.

At this time, since the intermediate discharge pipe 121 is directed toward the gap between the adjacent stator coils 28 wound around the stator 22 of the upper electric mechanism portion 14, the refrigerant gas having a relatively low temperature is still discharged. The electric power can be positively supplied in the direction of the electric mechanism unit 14, and the temperature rise of the electric mechanism unit 14 can be suppressed.
In addition, the inside pressure (MP
It becomes 1).

Then, the intermediate pressure refrigerant gas in the closed container 12 is discharged from the sleeve 142 (the intermediate discharge pressure is equal to the above-mentioned MP value).
1) The refrigerant is introduced from the suction port 162 to the low pressure chamber side of the cylinder 40 via the refrigerant introduction pipe 94 and the suction passage 60 formed in the upper support member 56 (second-stage suction pressure MP
2). The sucked intermediate-pressure refrigerant gas is compressed in the second stage by the operation of the roller 48 and the vane 50 to become high-temperature and high-pressure refrigerant gas (second-stage discharge pressure HP: 12 MPa.
G), flowing from the high pressure chamber side into the muffler 171 through the discharge muffling chamber 64 formed in the upper support member 56 and the refrigerant discharge pipe 96 from the high pressure chamber side, and the pulsation of the refrigerant is caused by the action of the baffle plate 173. The refrigerant, which is promptly leveled and the pulsation of which is suppressed, flows into the gas cooler 201 through the refrigerant pipe. At this time, the refrigerant temperature has risen to about 100 ° C., and the high-temperature and high-pressure refrigerant gas radiates heat to be cooled and exits the gas cooler 201.

After the pressure is reduced by the expansion valve 202, it flows into the evaporator 203 and evaporates. The air in the vehicle is cooled by the heat of vaporization that the refrigerant takes away from the surroundings during the evaporation in the evaporator 203, and the air is cooled. The cycle in which the refrigerant vapor evaporated in the evaporator 203 is sucked into the first compression mechanism section 32 from the refrigerant introduction pipe 92 via the accumulator 204 (not shown in FIG. 18) is repeated.

Since the present invention is not limited to the above embodiment, various modifications can be made without departing from the spirit of the claims.

For example, the high-pressure refrigerant compressed by the rotary compression mechanism portion 18 is directly discharged to the outside of the closed container 12 via the refrigerant discharge pipe 96 without being discharged to the inside of the muffler 17.
It may be a so-called internal low-pressure compressor introduced in No. 1.

The discharge muffling chambers 62 and 64 provided in the first compression mechanism section 32 and the second compression mechanism section 34 may be omitted. Further, the connection of the oil return pipe 174 to the closed container 12 can be made detachable via a sleeve like other pipes.

Further, the gas cooler 201 is constructed so that the heat radiated by the high-temperature and high-pressure refrigerant gas can be used, and the compressor 1
It is also possible to use 0 as a compressor of an air conditioner capable of heating operation, or as a compressor of a hot water supply device.

When the compressor 10 is used as a compressor of a refrigerating apparatus, hydrofluorocarbon (HFC), hydrochlorofluorocarbon (HCFC) or the like may be used as a refrigerant.

[0062]

As described above, according to the present invention, the refrigerant compressed by the compression mechanism provided in the container is not discharged into the container at least the refrigerant compressed by the final step of the compression mechanism. In an internal low-pressure or internal intermediate-pressure compressor that discharges directly to the outside of the container, a muffler is provided outside the container, and the muffler inlet and the final process outlet of the compression mechanism are connected by a refrigerant pipe, and the lower part of the muffler and the container are connected. Since it is a compressor that is connected by an oil return pipe, the muffler has a sufficient size, and a sufficient number of baffle plates installed inside are installed to prevent pulsation such as refrigerant flowing in after being compressed to a predetermined pressure. It can be leveled quickly. Therefore, for example, it is possible to suppress the vibration of the refrigerant pipe that is connected to the discharge port of the muffler and guides the compressed refrigerant to the gas cooler, and effectively prevent the generation of noise. Further, the muffler and the container can be connected by a short oil return pipe, and the refrigerating machine oil discharged to the outside of the container together with the high-pressure refrigerant is promptly returned to the closed container to be replenished, so the refrigerating machine oil in the container is insufficient. There is nothing to do.

Further, in a compressor in which carbon dioxide is used as the refrigerant, even if the carbon dioxide refrigerant is compressed to a high pressure to bring it into a supercritical state, the refrigerant compressed to the maximum pressure is discharged into the closed container. Since it is directly introduced into the muffler outside the container via the refrigerant pipe without pressure, the pressure resistance of the hermetically sealed container containing the compression mechanism does not pose a problem.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a compressor of the present invention.

2 is a front view of the compressor shown in FIG. 1. FIG.

3 is a side view of the compressor shown in FIG. 1. FIG.

FIG. 4 is another vertical cross-sectional view of the compressor shown in FIG.

5 is yet another vertical cross-sectional view of the compressor of FIG.

6 is a plan sectional view of an electric mechanism portion of the compressor shown in FIG.

7 is an enlarged cross-sectional view of a rotary compression mechanism portion of the compressor shown in FIG.

8 is an enlarged cross-sectional view of a vane portion of a second compression mechanism portion of the compressor shown in FIG.

9 is a cross-sectional view of a lower support member and a lower cover of the compressor shown in FIG.

FIG. 10 is a bottom view of a lower support member of the compressor shown in FIG.

11 is a top view of an upper support member and an upper cover of the compressor shown in FIG.

12 is a cross-sectional view of an upper support member and an upper cover of the compressor shown in FIG.

FIG. 13 is a top view of an intermediate partition plate of the compressor shown in FIG.

14 is a cross-sectional view taken along the line AA of FIG.

15 is a top view of a cylinder of the compressor shown in FIG. 1. FIG.

16 is a diagram showing pressure fluctuations on a suction side of a cylinder of the compressor shown in FIG.

17 is a cross-sectional explanatory view showing a connecting portion of a rotary shaft of the compressor shown in FIG.

18 is a refrigerant circuit diagram of an air conditioner to which the compressor of FIG. 1 is applied.

FIG. 19 is an explanatory diagram showing a conventional technique.

[Explanation of symbols]

10, 10X (rotary) compressor 12 airtight container 12A container body 12B end cap 14 Electric mechanism 16 rotation axes 18 Rotary compression mechanism 20 terminals 22 Stator 24 rotor 26 laminate 28 Stator coil 30 stacks 31 Permanent magnet 32 First compression mechanism section 34 Second compression mechanism section 36 Intermediate partition plate 38, 40 cylinders 39, 41 Discharge port 42 Eccentric part 43A, 43B groove 44 Eccentric part 45A, 45B groove 46, 48 rollers 50 vanes 54 Lower support member 56 Upper support member 58, 60 Suction passage 62 Discharge silencer 63 communication passage 64 discharge silencer 66 Lower cover 68 Top cover 70 vane slots 70A storage 76 Spring (Spring member) 78,129 Main bolt 80 oil holes 81, 82, 83, 84 Oil supply hole 90 Connection 92,94 Refrigerant introduction pipe 96 Refrigerant discharge pipe 121 Intermediate discharge pipe 131 Through hole (oil supply passage) 132 sealing material 133,134 communication holes 137 plug 138 O-ring 141, 142, 143, 144 Sleeves 147,148 Bracket 152 Collar 151 screw groove 161, 162 suction port 171 muffler 172 bracket 173 baffle 174 oil return pipe 190 Refrigerator oil 200 air conditioner 201 gas cooler 202 expansion valve 203 evaporator 204 Accumulator 205 bracket

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takashi Sato             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Yo Denki Co., Ltd. (72) Inventor Dai Matsuura             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Yo Denki Co., Ltd. (72) Inventor Kazuya Sato             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Yo Denki Co., Ltd. (72) Inventor Hiroyuki Matsumori             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Yo Denki Co., Ltd. (72) Inventor Toshiyuki Ehara             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Yo Denki Co., Ltd. (72) Inventor Haruhisa Yamazaki             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Yo Denki Co., Ltd. (72) Inventor Masaya Tadano             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Yo Denki Co., Ltd. (72) Inventor Satoru Imai             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Yo Denki Co., Ltd. (72) Inventor Atsushi Oda             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Yo Denki Co., Ltd. F-term (reference) 3H003 AA05 AB04 AC03 BA04 BA05                       BD12 BH05 CD07

Claims (2)

[Claims] 1. A low internal pressure or an internal pressure that directly discharges a refrigerant compressed by a compression mechanism provided in a container to the outside of the container without discharging the refrigerant compressed at least in the final step of the compression mechanism into the container. In the intermediate pressure type compressor, a muffler is provided outside the container, and the muffler inlet and the final process discharge port of the compression mechanism section are connected by a refrigerant pipe,
A compressor characterized in that the lower part of the muffler and the container are connected by an oil return pipe. 2. The compressor according to claim 1, wherein the refrigerant is carbon dioxide.