JP2003120559A - Rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary compressor improved in workability while improving the strength of a rotating shaft. SOLUTION: This rotary compressor comprises: first and second cylinders for constituting first and second rotating compression elements; and first and second rollers fitted to first and second eccentric parts 44 and 41 formed with a phase difference of 180 deg. to the rotating shaft of an electric element, and eccentrically rotated in the respective cylinders. A connecting part 90 for mutually connecting both the eccentric parts is formed in a sectional shape such that the thickness in the direction orthogonal to the eccentric direction of both the eccentric parts is larger than the thickness in the eccentric direction thereof. The side surface in the eccentric directional side of the first eccentric part of the connecting part has a circular shape having the same center as the second eccentric part, and the side surface of the eccentric directional side of the second eccentric part has a circular shape having the same center as the first eccentric part.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor in a closed container.
Element and first and second rotations driven by the electric element.
Related to a rotary compressor provided with a rolling compression element
Things. 2. Description of the Related Art Conventional rotary compressors of this kind
And an internal intermediate pressure type multistage compression type rotary compressor
The refrigerant gas flows from the suction port of the first rotary compression element.
It is sucked into the low pressure chamber side of the cylinder and fits into the eccentric part of the rotating shaft.
The roller and vane are compressed by the action of
Through the discharge port and discharge muffler chamber from the high pressure chamber side of the
And is discharged into a closed container. And in this sealed container
The intermediate-pressure refrigerant gas is supplied to the suction port of the second rotary compression element.
From the cylinder into the low-pressure chamber, and fits into the eccentric part of the rotating shaft.
Compression of the second stage is performed by the operation of the combined roller and vane.
It becomes a high-temperature and high-pressure refrigerant gas and is discharged from the high-pressure chamber side
Flowed into the radiator through the port and discharge muffler, and released heat
After that, it is throttled by the expansion valve and absorbs heat by the evaporator.
Repeat the cycle inhaled by the element. [0003] The eccentric portion of the rotating shaft has a phase difference of 180 degrees.
The eccentric part is connected by a connecting part.
Are linked. [0004] Here, such a rotary
A refrigerant with a large difference between high and low pressures, such as carbon dioxide
Carbon dioxide (CO) _Two ) As refrigerant
If the pressure is high, the discharged refrigerant pressure will be high
In the first stage, which reaches 12 MPaG in
8 MPaG (intermediate pressure) at the rolling compression element (first rotation
The suction pressure of the compression element is 4 MPa). [0005] As described above, when the difference between the high and low pressures becomes large,
The cross-section of the connecting part of the rotating shaft has a circular shape coaxial with the rotating shaft.
In this case, the cross-sectional area that can be physically secured is small,
It is easy to deform. Therefore, conventionally, the cross-sectional shape of the connecting part
With respect to the thickness of the eccentric portions in the eccentric direction,
Rugby ball shape with a large wall thickness in the orthogonal direction
Although it was intended to improve the strength,
There has been a problem that the number of processing steps is increased and productivity is deteriorated. [0006] The present invention solves the problems of the prior art.
The aim was to improve the strength of the rotating shaft.
Provide rotary compressor with improved workability
The purpose is to do. [0007] That is, the rotary of the present invention
The compressor is equipped with an electric element and a motor
First and second rotary compression elements driven by the element,
The gas compressed by the first rotary compression element is subjected to a second rotary compression
First and second rotational compression
First and second cylinders and electric motors for constituting elements
The element formed with a phase difference of 180 degrees on the rotation axis of the element
Eccentric rotation in each cylinder by fitting to the first and second eccentric parts
A first roller and a second roller, which connect both eccentric parts;
The cross-sectional shape of the connecting part to the thickness of the eccentric part in the eccentric direction.
And a shape having a large thickness in a direction orthogonal to the eccentric direction.
And the eccentric side of the first eccentric portion of the connecting portion.
The side surface has an arc shape coaxial with the second eccentric portion,
The side surface of the eccentric portion on the eccentric direction side is the same as the first eccentric portion.
It is characterized in that it has an arc shape of the heart. According to the present invention, an electric element is provided in a closed container.
And first and second rotational pressures driven by the electric element.
A gas compressed by the first rotary compression element.
For a rotary compressor that compresses with the second rotary compression element
In order to configure the first and second rotary compression elements,
180 on the rotation axis of the first and second cylinders and the electric element.
First and second eccentric portions formed with a phase difference of
First and second fittings that rotate eccentrically in each cylinder
Cross-sectional shape of the connecting part that has rollers and connects both eccentric parts
With respect to the thickness of the eccentric portions in the eccentric direction,
Because it has a shape with a large wall thickness in the orthogonal direction,
The rigidity of the shaft is improved, and its elastic deformation is effectively prevented.
Will be able to In particular, the eccentricity of the first eccentric part of the connecting part
The side surface on the opposite side has an arc shape coaxial with the second eccentric portion.
The side surface of the second eccentric portion on the eccentric direction side is the first eccentric portion.
And the same eccentric shape.
When cutting a rotating shaft with a joint,
It is possible to reduce the number of changes. This
To reduce the number of processing steps and improve productivity
Down can be realized. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention;
The form will be described in detail. FIG. 1 shows a rotary compressor according to the present invention.
As an example, the first and second rotary compression elements 32, 3
Intermediate pressure type multi-stage (two-stage) compression type rotary equipped with
FIG. 2 is a longitudinal sectional view of the compressor 10, and FIG.
Front view of the compressor 10, FIG. 3 side of the rotary compressor 10
FIG. 4 is another vertical view of the rotary compressor 10.
FIG. 5 is a cross-sectional view, and FIG.
FIG. 6 shows an electric motor of the rotary compressor 10.
FIG. 7 shows a rotary compressor, and FIG.
10 is an enlarged sectional view of the rotary compression mechanism 18 of FIG.
ing. In each figure, 10 is carbon dioxide (C
O _Two ) Is used as a refrigerant,
This rotary compressor 1
Reference numeral 0 denotes a cylindrical closed container 12 made of a steel plate,
Electric element 14 arranged and housed above the internal space of vessel 12
And an electric element 14 disposed below the electric element 14.
First rotary compression element 32 driven by the rotary shaft 16
(First stage) and the second rotary compression element 34 (second stage)
And a rotary compression mechanism 18. Example of
The height of the rotary compressor 10 is 220 mm (outside
The diameter of the electric element 14 is about 80 mm.
(Outer diameter 110mm), the height of the rotary compression mechanism 18 is
Approximately 70mm (110mm outside diameter), rotating with the electric element 14
The distance from the compression mechanism 18 is about 5 mm. Ma
The displacement volume of the second rotary compression element 34 is equal to the first rotary pressure.
It is set smaller than the exclusion volume of the contraction element 32. The closed container 12 has a thickness of 4.5 mm in the embodiment.
, The bottom is an oil sump, and the electric element 1
4 and a container body 12A for storing the rotary compression mechanism 18,
A substantially bowl-shaped end for closing the upper opening of the container body 12A.
Cap (lid) 12B.
A circular mounting hole 12D is formed in the center of the upper surface of the
Are formed, and the electric element 14 is provided in the mounting hole 12D.
Terminal (supplied wiring) 20 for supplying power to
Is attached. In this case, the end around the terminal 20
The cap 12B has a step having a predetermined curvature by countersinking.
The part 12C is formed in an annular shape. Terminal 2
0 is a circular shape through which the electric terminal 139 is attached.
A glass portion 20A and a portion formed around the glass portion 20A
And a metal mounting portion 20 that protrudes obliquely outward and downward in a flange shape.
B. The thickness of the mounting part 20B is
2.4 ± 0.5 mm. And the terminal
20, the glass part 20A is inserted from below into the mounting hole 12D.
Insert and face upward, and attach the mounting portion 20B to the mounting hole 12D.
Attachment hole of end cap 12B in a state of contact with peripheral edge
By welding the mounting portion 20B to the periphery of the 12D, the end key
It is fixed to the cap 12B. The electric element 14 is located above the airtight container 12.
Stator 22 mounted annularly along the inner peripheral surface of
With a slight gap provided inside the stator 22
And a rotor 24 arranged. This rotor 24 is medium
It is fixed to a rotating shaft 16 that extends vertically through the heart.
You. The stator 22 is a donut-shaped electromagnetic steel plate.
And a series wound around the teeth of the laminate 26
(Concentrated winding) wound stator coil 2
8 (FIG. 6). The rotor 24 is also a stator
22 and is formed of a laminate 30 of electromagnetic steel sheets.
The permanent magnet MG is inserted into the layer body 30. The first rotary compression element 32 and the second rotation
An intermediate partition plate 36 is sandwiched between the compression element 34 and the compression element 34.
You. That is, the first rotary compression element 32 and the second rotary compression element are required.
The element 34 has an intermediate partition plate 36 and the intermediate partition plate 36.
The lower cylinder (second cylinder) 38,
(First cylinder) 40 and the upper and lower cylinders 3
8 and 40 are installed on the rotating shaft 16 with a phase difference of 180 degrees.
The upper eccentric portion (second eccentric portion) 42 and the lower eccentric portion (first
The upper roller (second eccentric part) which is fitted to the eccentric part
Roller) 46, lower roller (first roller) 48,
Contact the upper and lower rollers 46, 48 of the upper and lower cylinders 38,
40 is divided into a low-pressure chamber side and a high-pressure chamber side, respectively.
Upper and lower vanes 50 (the lower vanes are not shown)
The upper opening surface of the cylinder 38 and the lower surface of the lower cylinder 40
A support part that closes the opening surface and also serves as a bearing for the rotating shaft 16.
In the upper support member 54 and the lower support member 56 as materials
Be composed. Upper support member 54 and lower support member 56
The upper and lower cylinders 3 with suction ports 161 and 162
Suction passages 58, 60 communicating with the insides of 8, 8 respectively
When the depressed discharge muffling chambers 62 and 64 are formed,
In addition, the openings of these two discharge muffling chambers 62 and 64 are respectively
Closed by the cover. That is, the discharge muffling chamber 62 is covered.
The upper cover 66 and the discharge muffling chamber 64
The lower cover 68 is closed. In this case, a shaft is provided at the center of the upper support member 54.
A bearing 54A is formed upright.
A cylindrical bush 122 is mounted on the surface. Also,
A bearing 56A is formed through the center of the lower support member 56.
The cylindrical bush 1 is also provided on the inner surface of the bearing 56A.
23 are mounted. These bushes 122, 123
Is made of a material having good slidability as described later,
The rotating shaft 16 is moved up through these bushes 122 and 123.
Bearing 54A of the lower support member 54 and the shaft of the lower support member 56
It is held by the receiver 56A. In this case, the lower cover 68 has a donut shape.
It is composed of round steel plates, and four peripheral
Are fixed to the lower support member 56 from below by
Of the first rotary compression element 32 at the discharge port 41.
Opening of the lower surface of the discharge silence chamber 64 communicating with the inside of the lower cylinder 40
Close mouth. The tip of this main bolt 129 ...
It is screwed to the part support member 54. The inner periphery of the lower cover 68
Projecting inward from the inner surface of the bearing 56A of the lower support member 56
As a result, the lower end surface of the bush 123
It is held by the cover 68 and falling off is prevented.
(FIG. 9). FIG. 10 shows the lower surface of the lower support member 56.
128 is the discharge port 41 in the discharge silence chamber 64.
Is a discharge valve of the first rotary compression element 32 that opens and closes. The lower supporting member 56 is made of an iron-based sintered material.
Material (or casting).
The surface (lower surface) on the side to which the cover 68 is attached has a flatness of 0.
After processing to 1mm or less, steam treatment is added
I have. The lower cover 68 is removed by this steam processing.
Since the surface to be attached is made of iron oxide, the holes inside the sintered material
It is closed and sealing performance is improved. This allows the lower cover
Gasket needs to be interposed between 68 and lower support member 56
Disappears. It is to be noted that the discharge muffling chamber 64 and the closed
The upper element 66 side of the upper cover 66
Communication passages which are holes penetrating through 38, 40 and the intermediate partition plate 36;
Communication is made at 63 (FIG. 4). In this case, the communication passage 6
An intermediate discharge pipe 121 is provided upright at the upper end of 3.
The intermediate discharge pipe 121 is connected to the stator 22 of the upper electric element 14.
Between adjacent stator coils 28, 28 wound around
It is directed to the gap (FIG. 6). The upper cover 66 is connected to the discharge port 39.
To communicate with the inside of the upper cylinder 38 of the second rotary compression element 34
The opening of the upper surface of the discharge silencing chamber 62 to be closed
2 is partitioned into a discharge muffling chamber 62 and the electric element 14 side. This
The upper cover 66 has a thickness of 2 mm or more as shown in FIG.
0 mm or less (in the embodiment, 6 mm is most desirable).
The bearing 54A of the upper support member 54 is
From a substantially donut-shaped circular steel plate with a through hole formed
With bead between upper support member 54
The gasket 124 is sandwiched between the gaskets 124
The peripheral part becomes four main bolts 78.
Thus, it is fixed to the upper support member 54 from above. this
The tips of the main bolts 78 are screwed into the lower support member 56
You. The upper cover 66 has such a thickness.
Therefore, the pressure in the discharge muffling chamber 62 becomes higher than that in the closed container 12.
Achieving miniaturization while sufficiently withstanding pressure, the electric element 1
4 can be secured. Change
The inner peripheral edge of the upper cover 66 and the outer surface of the bearing 54A
An O-ring 126 is provided between them (FIG. 12). Person in charge
O-ring 126 seals the bearing 54A side
As a result, the inner peripheral edge of the upper cover 66 is sufficiently sealed.
Gas leakage can be prevented,
The volume of the sound chamber 62 can be increased and the
It is necessary to fix the inner peripheral side of the cover 66 to the bearing 54A.
Is also lost. Here, 127 in FIG.
Second rotation for opening and closing the discharge port 39 in the chamber 62
It is a discharge valve of the compression element 34. Next, the lower opening surface of the upper cylinder 38 and
Intermediate partition plate 3 for closing the upper opening surface of lower cylinder 40
6, a position corresponding to the suction side in the upper cylinder 38
Then, as shown in FIG. 13 and FIG.
Through the outer peripheral surface and the inner peripheral surface
A hole 131 is formed, and an outer peripheral surface of the through passage 131 is formed.
Side sealing material 132 is pressed in to seal the opening on the outer peripheral surface side.
I have. The through hole 131 extends upward in the middle.
A communication hole 133 is formed. On the other hand, the suction port 161 of the upper cylinder 38
The (suction side) communicates with the communication hole 133 of the intermediate partition plate 36.
A communication hole 134 is formed. Also, in the rotation shaft 16
As shown in FIG. 7, a vertical oil hole 80 is provided at the center of the shaft.
A horizontal oil supply hole 82 communicating with the oil hole 80;
84 (also formed on the vertical eccentric portions 42, 44 of the rotating shaft 16)
Is formed, and the through hole 1 of the intermediate partition plate 36 is formed.
The opening on the inner peripheral surface side of 31
Through the oil hole 80. As will be described later, the inside of the sealed container 12 has an intermediate pressure.
Therefore, the oil inside the upper cylinder 38, which becomes high pressure in the second stage,
Although it is difficult to supply the intermediate partition plate 36,
From the oil reservoir at the bottom of the closed container 12
After being pumped up, the oil hole 80 rises, and the oil supply holes 82, 8
4 comes out of the through hole 131 of the intermediate partition plate 36.
And suction of the upper cylinder 38 through the communication holes 133 and 134
Side (suction port 161). In FIG. 16, L is the pressure on the suction side of the upper cylinder 38.
In the drawing, P1 represents the pressure on the inner peripheral surface of the intermediate partition plate 36.
Show power. As shown by L1 in FIG.
The suction pressure (suction pressure) is the suction pressure during the suction process.
Loss lower than the pressure on the inner peripheral surface side of the intermediate partition plate 36
You. During this period, the through hole 131 of the intermediate partition plate 36 and the communication hole
133 through the communication hole 134 of the upper cylinder 38.
Refueling will be performed in the cylinder 38. As described above, the upper and lower cylinders 38 and 40,
Partition plate 36, upper and lower support members 54 and 56, and upper and lower covers 6
6 and 68 are four main bolts 78.
129... Are fastened from above and below
Cylinders 38 and 40, intermediate partition plate 36, upper and lower support members 5
4 and 56 are located outside these main bolts 78 and 129.
(Refer to FIG. 1).
4). This auxiliary bolt 136 is moved from the upper support member 54 side.
It is inserted, and the tip is screwed to the lower support member 56. Further, the auxiliary bolt 136 is
The shaft 50 is located near a later-described guide groove 70.
In this way, the auxiliary bolts 136 and 136 are added to
By integrating the compression mechanism 18, the inside becomes extremely high pressure
Sealing performance against
Since the vicinity of the guide groove 70 of the blade 50 is tightened,
It is also possible to prevent the leakage of high pressure back pressure applied to
You. On the other hand, the upper cylinder 38
Guide groove 70 for accommodating the shaft 50, and the outside of the guide groove 70
And accommodates a spring 76 as a spring member
A storage part 70A is formed, and this storage part 70A is a plan.
Open to the inner groove 70 side and the sealed container 12 (container main body 12A) side
(FIG. 8). The spring 76 of the vane 50
Always in contact with the outer end, always attach the vane 50 to the roller 46 side.
Energize. Then, the spring 76 side of the closed container 12
A metal plug 137 is provided in the storage section 70A.
This serves to prevent the spring 76 from coming off. In this case, the outer size of the plug 137 is
It is set smaller than the inner size of 0A, and the plug 137 is stored
It is inserted into the portion 70A by a clearance fit. Also plug
The plug 137 and the storage portion 70A
An O-ring 138 for sealing between faces is attached.
ing. The outer end of the upper cylinder 38, that is, the storage section
Distance between outer end of 70A and container body 12A of closed container 12
Is from the O-ring 138 to the plug 137 on the closed container 12 side.
Is set to be smaller than the distance to the end. Soshi
And a back pressure (not shown) communicating with the guide groove 70 of the vane 50.
In the chamber, a high pressure, which is the discharge pressure of the second rotary compression element 34, is applied.
Applied as back pressure. Therefore, the split of the plug 137
The pressure on the ring 76 side is high, and the pressure on the sealed container 12 side is intermediate pressure. With such a dimensional relationship, the plug 1
37, as in the case of press-fitting and fixing the
Seal between the upper support member 54 and the deformed cylinder 38
To avoid the inconvenience of reduced performance and performance degradation.
And be able to do it. In addition, such a gap fit
The distance between the upper cylinder 38 and the sealed container 12 is
138 to the end of the plug 137 on the closed container 12 side.
Since it is set smaller than the distance, the spring 76 side
Of the plug 137 due to the high pressure (back pressure of the vane 50)
Even if it moves in the direction of being pushed out from the storage section 70A,
O-ring is still in place at the time when movement is blocked
138 is located in the storage section 70A and sealed,
There is no problem with the function of the lug 138. By the way, a 180-degree
The upper and lower eccentric portions 42 and 44 formed with a phase difference
The connecting portion 90 for connecting between the shafts 16
To increase rigidity by making the cross-sectional area larger than the circular cross section of
As shown in FIG. 17, a non-circular so-called rugby ball shape
And the eccentricity of the upper and lower eccentric portions 42 and 44 provided on the rotating shaft 16.
Perpendicular to the eccentric direction of the upper and lower eccentric portions 42 and 44
The direction in which the wall thickness is larger is
Ching part). Thus, the rotary shaft 16 is provided integrally with the rotary shaft 16.
Sectional area of connecting portion 90 connecting upper and lower eccentric portions 42 and 44
Is increased, the second moment of area increases, and the strength (rigidity) increases.
), And the durability and reliability of the rotating shaft 16 are improved.
Particularly, the refrigerant having a high working pressure is compressed in two stages as in the embodiment.
In this case, since the pressure difference between high and low pressures is large,
However, the cross-sectional area of the connecting portion 90 is increased.
The strength (rigidity) of the rotating shaft 16
Sexual deformation can be prevented. Furthermore, in the case of the present invention, the upper eccentric portion 42
The center is O1, the radius of the eccentric part is R1, and the lower eccentricity is
The center of the portion 44 is O2, and the radius of the eccentric portion 44 is R3.
The eccentric direction of the upper eccentric part (first eccentric part) 42
Surface of the side connecting portion 90 (left surface of hatching in FIG. 17)
Is an arc shape whose center is O2, and the eccentricity of the eccentric portion 44 is
The surface of the connecting portion 90 on the direction side (the right side of the hatching in FIG. 17)
(Surface) has an arc shape whose center is O1. Incidentally, the connection of the upper eccentric portion 42 on the eccentric direction side.
If the radius of the arc of the surface of the portion 90 is R4, this radius R4
Can be extended up to the radius R3 of the lower eccentric part 44,
Of the surface of the connecting portion 90 on the eccentric direction side of the
Assuming that the radius is R2, the radius R2 is the maximum eccentricity of the upper side.
It can be extended to the radius R1 of the part 42. Thus, the eccentric direction of the upper eccentric portion 42
The center of the arc of the surface of the side connecting portion 90 is O2, and the lower eccentric portion is
The center of the arc of the surface of the connecting portion 90 on the eccentric direction side
And the rotating shaft 16 is chucked to the cutting machine.
The vertical eccentric portions 42 and 44 of the rotating shaft 16 and the connecting portion 90
When cutting, after processing the eccentric part 42, only the radius
Change or without change the eccentric part 44 of the connecting part 90
The surface on the eccentric side (the surface on the right side in FIG. 17) is processed, and then
Eccentricity of the eccentric part 42 of the connecting part 90 by changing the chuck position
Direction side surface (the left side surface in FIG. 17) and process only the radius
If you change the eccentric part 44 with or without changing
Such work becomes possible. As a result, the rotation shaft 16 is
Reduce the number of rework steps and reduce the number of machining steps
Is significantly improved. In the rotary compressor 10, the refrigerant
Is friendly to the global environment and considers flammability and toxicity.
Said diacid as an example of carbon dioxide which is a natural refrigerant
Carbonized (CO _Two ), The oil as lubricating oil is
For example, mineral oil (mineral oil), alkylbenzene
Existing oils such as oil, ether oil and ester oil are used
You. On the other hand, the side of the container body 12A of the closed container 12
The suction passage between the upper support member 54 and the lower support member 56
On the paths 58, 60, the discharge silencer 62, and the upper cover 66
Side (position substantially corresponding to the lower end of the electric element 14)
In position, sleeves 141, 142, 143 and 144 are
Each is fixed by welding. Sleeves 141 and 142
Are vertically adjacent to each other, and the sleeve 143 is the sleeve 1
41 is on a substantially diagonal line. The sleeve 144 is
At about 90 degrees from the probe 141. The sleeve 141 has an upper cylinder
One end of a refrigerant introduction pipe 92 for introducing a refrigerant gas into 38
Is inserted and connected, and one end of the refrigerant introduction pipe 92 is connected to the upper syringe.
The suction passage 58 of the die 38 communicates with the suction passage 58. This refrigerant introduction pipe 9
2 passes above the closed container 12 and reaches the sleeve 144.
And the other end is inserted and connected into the sleeve 144 to form a closed container.
It communicates within 12. In the sleeve 142, the lower cylinder 4
One end of a refrigerant introduction pipe 94 for introducing a refrigerant gas into
One end of the refrigerant introduction pipe 94 is inserted and connected to a lower cylinder.
The suction passage 60 is communicated with the suction passage 60. This refrigerant introduction pipe 94
Is connected to the lower end of the accumulator 146.
You. A coolant discharge pipe 96 is inserted into the sleeve 143.
One end of the refrigerant discharge pipe 96 is connected to the discharge silence chamber 62.
Is communicated to. The accumulator 146 controls the suction refrigerant
This is a tank for performing liquid separation.
Bracket on the closed container side welded and fixed to the upper side of 2A
147 via the bracket 148 on the accumulator side.
Attached. This bracket 148 is
Extending upward from the accumulator 146
Holds approximately the center in the vertical direction.
The mullator 146 is arranged along the side of the closed container 12.
Is placed. Refrigerant inlet tube 92 has exited sleeve 141
Later, in the example, after bending to the right, it rises,
The lower end of the accumulator 146 is close to the refrigerant introduction pipe 92.
It will be shaped. Therefore, the lower end of the accumulator 146
The refrigerant introduction pipe 94 descending from the sleeve 141 is viewed from the sleeve 141.
Bypassing the left side opposite to the bending direction of the refrigerant introduction pipe 92
It is routed to reach the sleeve 142 (FIG.
3). That is, the upper support member 38 and the lower support member 4
Refrigerant inlet pipes respectively communicating with the suction passages 58 and 60
92 and 94 are opposite sides in the horizontal direction when viewed from the closed container 12.
The shape is bent in the direction
By increasing the vertical dimension of the accumulator 146 to increase the volume
So that the refrigerant introduction pipes 92 and 94 do not interfere with each other.
Considered. The sleeves 141, 143, 144
A flange portion 15 around which the coupler for pipe connection can be engaged is provided around the outer surface.
1 is formed on the inner surface of the sleeve 142.
A thread groove 152 for connection is formed. This allows
Leaves 141, 143 and 144 have rotary compression
A place to perform an airtightness test in the completion inspection in the manufacturing process of SA10
In this case, the coupler of the test pipe can be easily connected to the flange 151.
And the sleeve 142 has a thread groove 152.
Can be used to screw test tubing easily.
You. In particular, the upper and lower adjacent sleeves 141 and 142
A collar 151 is provided on one sleeve 141, and a sleeve 151 is provided on the other sleeve.
Since the thread groove 152 is formed in the 142, a narrow space is formed.
Test piping can be connected to each sleeve 141, 142 between
It becomes. The rotary compressor 1 of the embodiment
0 is used in the refrigerant circuit of the water heater 153 as shown in FIG.
Used. That is, the refrigerant discharge of the rotary compressor 10
The pipe 96 is connected to an inlet of a gas cooler 154 for heating water.
You. This gas cooler 154 does not show the hot water supply device 153.
It is installed in a hot water storage tank. Distribution that exited gas cooler 154
The pipe passes through an expansion valve 156 as a decompression device and an evaporator 157.
And the outlet of the evaporator 157 is connected to the refrigerant introduction pipe 94.
Connected. Also, FIG.
2. A differential, not shown in FIG.
Lost pipe 158 branches off, solenoid valve as flow control device
Refrigerant discharge to the inlet of gas cooler 154 via 159
It is connected to a tube 96. In addition, in FIG.
The data 146 is omitted. The operation of the above configuration will now be described. In addition,
In the thermal operation, the electromagnetic valve 159 is assumed to be closed. Tar
The electric element 1 via the terminal 20 and wiring not shown
4 is energized, the electric element 14
Is activated and the rotor 24 rotates. Rotation by this rotation
Fitted to upper and lower eccentric portions 42 and 44 provided integrally with the shaft 16
Upper and lower rollers 46 and 48
Eccentric rotation. Thus, the refrigerant introduction pipe 94 and the lower support
Via a suction passage 60 formed in the holding member 56.
Port 162 into the lower pressure chamber side of the lower cylinder 40
Low-pressure (first stage suction pressure LP: 4 MPaG) refrigerant gas
The intermediate pressure (M) is compressed by the operation of the roller 48 and the vane.
P1: 8 MPaG) from the high pressure chamber side of the lower cylinder 40
Discharge port 41 and discharge formed on the lower support member 56.
From the muffle chamber 64 to the intermediate discharge pipe 121 via the communication passage 63
It is discharged into the closed container 12. At this time, the middle discharge pipe 121 is
Adjacent stays wound on the stator 22 of the element 14
Because it is directed to the gap between the coils 28, 28
Positively moves refrigerant gas with relatively low temperature in the direction of the electric element 14
And the temperature rise of the electric element 14 is suppressed.
Will be controlled. In addition, this enables the closed container 1
The inside of 2 becomes an intermediate pressure (MP1). The refrigerant gas of the intermediate pressure in the closed vessel 12 is
Is discharged from the sleeve 144 (the intermediate discharge pressure is
1) Formed on the refrigerant introduction pipe 92 and the upper support member 54
From the suction port 161 via the suction passage 58, the upper syringe
(The second stage suction pressure MP).
2). The sucked intermediate-pressure refrigerant gas is applied to the roller 46 and the base.
The second stage compression is performed by the operation of the
Pressure refrigerant gas (second stage discharge pressure HP: 12 MPa
G) Upper support member from the high pressure chamber side through the discharge port 39
54 through a discharge muffling chamber 62 and a refrigerant discharge pipe 96.
As a result, the gas flows into the gas cooler 154. Refrigerant at this time
The temperature has risen to approximately + 100 ° C,
The refrigerant gas radiates heat and heats the water in the hot water storage tank, about +
Produce 90 ° C hot water. On the other hand, the refrigerant itself in the gas cooler 154
Is cooled and exits gas cooler 154. And the expansion valve
After the pressure is reduced at 156, it flows into the evaporator 157 and evaporates.
And an accumulator 146 (not shown in FIG. 18).
Through the refrigerant introduction pipe 94 into the first rotary compression element 32
Repeat the sucked cycle. Particularly, in an environment of low outside air temperature, such heating
During operation, frost forms on the evaporator 157. In that case
The solenoid valve 159 is opened, and the expansion valve 156 is fully opened.
The defrosting operation of the evaporator 157 is performed. This allows hermetic sealing
The intermediate-pressure refrigerant in the container 12 (the second rotary compression element 34
Containing a small amount of high-pressure refrigerant discharged from the
158 to the gas cooler 154. The temperature of this refrigerant
The temperature is about +50 to + 60 ° C, and the gas cooler 154
It does not radiate heat, but initially the refrigerant absorbs heat.
You. The refrigerant flowing out of the gas cooler 154 is supplied to the expansion valve 1.
It passes through 56 and reaches the evaporator 157. That is,
Evaporator 157 reduces the amount of refrigerant at a relatively high intermediate temperature.
It is practically supplied directly without pressure,
Evaporator 157 is heated and defrosted
Become. Here, the discharge from the second rotary compression element 34
The high-pressure refrigerant thus supplied is supplied to the evaporator 157 without being decompressed and removed.
In the case of frost, the expansion valve 156 is first opened for full opening.
The suction pressure of the rolling and compressing element 32 increases, thereby causing the first
, The discharge pressure (intermediate pressure) of the rotary compression element 32 increases.
This refrigerant is discharged through the second rotary compression element 34
However, since the expansion valve 156 is fully opened, the second rotary compression element 3
4 is equal to the suction pressure of the first rotary compression element 32.
Discharge of the second rotary compression element 34
(High pressure) and suction (intermediate pressure) cause a pressure reversal phenomenon.
I will. However, as described above, the first rotary compression element
The intermediate-pressure refrigerant gas discharged from the
And remove it from the evaporator 157
Therefore, the reverse phenomenon of the high pressure and the intermediate pressure can be prevented.
I will be able to. In the above embodiment, the rotary compressor is used.
10 was used for the refrigerant circuit of the hot water supply device 153,
However, the present invention is effective even when used for heating a room.
You. As described in detail above, according to the present invention, the closed
An electric element in a container, and a first element driven by the electric element.
And a second rotary compression element, wherein the first rotary compression element
Rotor for compressing compressed gas with a second rotary compression element
First and second rotary compression elements in a recompressor
And second cylinder and electric element for constituting
First and second rotation axes formed with a phase difference of 180 degrees
And is eccentrically rotated in each cylinder by being fitted to the second eccentric part.
A first roller and a second roller for connecting the two eccentric portions.
The cross-sectional shape of the connecting part should be
As a shape with a large thickness in the direction perpendicular to the eccentric direction
The rigidity of the rotating shaft is improved,
It can be prevented effectively. In particular, the eccentricity of the first eccentric part of the connecting part
The side surface on the opposite side has an arc shape coaxial with the second eccentric portion.
The side surface of the second eccentric portion on the eccentric direction side is the first eccentric portion.
And the same eccentric shape.
When cutting a rotating shaft with a joint,
It is possible to reduce the number of changes. This
To reduce the number of processing steps and improve productivity
Down can be realized.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a rotary compressor according to an embodiment of the present invention. FIG. 2 is a front view of the rotary compressor of FIG. FIG. 3 is a side view of the rotary compressor of FIG. 1; FIG. 4 is another longitudinal sectional view of the rotary compressor of FIG. 1; FIG. 5 is still another longitudinal sectional view of the rotary compressor of FIG. 1; FIG. 6 is a plan sectional view of an electric element portion of the rotary compressor of FIG. 1; FIG. 7 is an enlarged sectional view of a rotary compression mechanism of the rotary compressor of FIG. 1; FIG. 8 is an enlarged sectional view of a vane portion of a second rotary compression element of the rotary compressor of FIG. FIG. 9 is a sectional view of a lower support member and a lower cover of the rotary compressor of FIG. 1; FIG. 10 is a bottom view of the lower support member of the rotary compressor of FIG. 1; FIG. 11 is a top view of an upper support member and an upper cover of the rotary compressor of FIG. 1; FIG. 12 is a sectional view of an upper support member and an upper cover of the rotary compressor of FIG. 1; FIG. 13 is a top view of an intermediate partition plate of the rotary compressor of FIG. 1; FIG. 14 is a sectional view taken along the line AA of FIG. 13; FIG. 15 is a top view of the upper cylinder of the rotary compressor of FIG. 1; FIG. 16 is a diagram showing pressure fluctuations on the suction side of the upper cylinder of the rotary compressor of FIG. 1; 17 is a cross-sectional view for explaining a shape of a connecting portion of a rotary shaft of the rotary compressor in FIG. FIG. 18 is a refrigerant circuit diagram of a hot water supply apparatus to which the rotary compressor of FIG. 1 is applied. DESCRIPTION OF SYMBOLS 10 Rotary compressor 12 Sealed container 12A End cap 14 Electric element 16 Rotary shaft 18 Rotary compression mechanism 20 Terminal 32 First rotary compression element 34 Second rotary compression element 36 Intermediate partition plates 38, 40 Cylinder 39 , 41 Discharge port 42 Eccentric part 44 Eccentric part 46 Roller 48 Roller 50 Vane 54 Upper support member 56 Lower support member 62 Discharge muffler chamber 64 Discharge muffler chamber 66 Upper cover 68 Lower cover 70 Guide groove 70A Housing 76 Spring (spring member) 78, 129 Main bolt 90 Connecting part 92, 94 Refrigerant introduction pipe 96 Refrigerant discharge pipe 131 Through hole (oil supply path) 132 Sealing material 133, 134 Communication hole 137 Plug 138 O-ring 141, 142, 143, 144 Sleeve 146 Accumulator 147 , 148 Bracket 151 Part 153 water heater 154 the gas cooler 156 expansion valve 157 the evaporator 158 the defrosting pipe 159 solenoid valve

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Haruhisa Yamazaki             2-5-5 Keihanhondori, Moriguchi-shi, Osaka 3             Yo Electric Co., Ltd. (72) Inventor Kenzo Matsumoto             2-5-5 Keihanhondori, Moriguchi-shi, Osaka 3             Yo Electric Co., Ltd. (72) Inventor Dai Matsuura             2-5-5 Keihanhondori, Moriguchi-shi, Osaka 3             Yo Electric Co., Ltd. (72) Inventor Takayasu Saito             2-5-5 Keihanhondori, Moriguchi-shi, Osaka 3             Yo Electric Co., Ltd. (72) Inventor Toshiyuki Ehara             2-5-5 Keihanhondori, Moriguchi-shi, Osaka 3             Yo Electric Co., Ltd. (72) Inventor Satoru Imai             2-5-5 Keihanhondori, Moriguchi-shi, Osaka 3             Yo Electric Co., Ltd. (72) Inventor Atsushi Oda             2-5-5 Keihanhondori, Moriguchi-shi, Osaka 3             Yo Electric Co., Ltd. (72) Inventor Takashi Sato             2-5-5 Keihanhondori, Moriguchi-shi, Osaka 3             Yo Electric Co., Ltd. (72) Inventor Hiroyuki Matsumori             2-5-5 Keihanhondori, Moriguchi-shi, Osaka 3             Yo Electric Co., Ltd. F-term (reference) 3H029 AA04 AA13 AB03 BB44 CC01

Claims (1)

Claims: 1. An electric element, and a first and a second rotary compression element driven by the electric element in an airtight container, wherein the first element is compressed by the first rotary compression element. In a rotary compressor for compressing gas by the second rotary compression element, a first compressor for forming the first and second rotary compression elements is provided.
And 180 on the rotation axis of the second cylinder and the electric element.
A first roller and a second roller which are fitted to first and second eccentric portions formed with a phase difference of degrees and rotate eccentrically in each of the cylinders, and a connection for connecting the two eccentric portions. The cross-sectional shape of the portion is such that the thickness in the direction perpendicular to the eccentric direction is greater than the thickness in the eccentric direction of the two eccentric portions, and the eccentric direction side of the first eccentric portion of the connecting portion. Side of the
The second eccentric portion has an arc shape having the same center as that of the second eccentric portion,
A rotary compressor, wherein a side surface of the eccentric portion on the eccentric direction side has an arc shape coaxial with the first eccentric portion.