JP2003120561A - Sealed electric compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealed electric compressor facilitating the keeping of the perpendicularity of a sleeve fixed to a sealed case by welding. SOLUTION: This sealed electric compressor comprises an electric element and a compression element driven by the electric element, which are provided within the sealed case 12, wherein a refrigerant sucked through a refrigerant inlet pipe is compressed by the compression element and discharged through a refrigerant discharge pipe. This compressor further comprises the sleeve 142 mounted in conformation to a through-hole 171 formed on the curved surface of the sealed case, to which the refrigerant inlet pipe or refrigerant discharge pipe is connected. A flat surface 173 is formed on the outer surface of the sealed case around the through-hole, an insert part 174 to be inserted to the through-hole and a butt part 17b located in its circumference to abut on the flat surface of the sealed case are formed on the sleeve, and the butt part of the sleeve is fixed to the flat surface of the sealed case by projection welding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic electric compressor having an electric element and a compression element driven by the electric element in a hermetic container.

[0002]

2. Description of the Related Art In this type of hermetically-sealed electric compressor, for example, an internal intermediate pressure type multi-stage compression type rotary compressor, a refrigerant gas flows from a refrigerant introduction pipe to a low pressure chamber side of a cylinder through a suction port of a first rotary compression element. It is sucked and compressed by the operation of the roller and the vane to become an intermediate pressure, and is discharged from the high pressure chamber side of the cylinder into the closed container through the discharge port and the discharge muffling chamber. Then, the intermediate pressure refrigerant gas in the closed container is sucked into the low pressure chamber side of the cylinder from the suction port of the second rotary compression element, and the second stage compression is performed by the operation of the roller and the vane, so that the high temperature and high pressure is achieved. It becomes refrigerant gas, discharged from the refrigerant discharge pipe from the high-pressure chamber side through the discharge port and the discharge muffling chamber, flows into the radiator and radiates heat, is then throttled by the expansion valve and absorbs heat in the evaporator, and again from the refrigerant introduction pipe. The cycle of being sucked into the first rotary compression element is repeated.

[0003]

Here, the refrigerant introduction pipe and the refrigerant discharge pipe are connected to a cylindrical sleeve welded and fixed to the curved surface of the closed container. Conventionally, a jig has been used to obtain the squareness of. Therefore, the assembling workability is deteriorated and the accuracy of the squareness is also low.

The present invention has been made in order to solve the problems of the prior art, and provides a hermetic electric compressor capable of easily maintaining the squareness of a sleeve welded and fixed to a hermetic container. The purpose is to do.

[0005]

That is, a hermetic electric compressor according to the present invention comprises an electric element in a hermetic container and a compression element driven by the electric element, and a refrigerant sucked from a refrigerant introduction pipe. Which is compressed by a compression element to be discharged from the refrigerant discharge pipe, and which is attached in correspondence with the through hole formed in the curved surface of the closed container and has a sleeve to which the refrigerant introduction pipe and the refrigerant discharge pipe are connected. A flat surface is formed on the outer surface of the closed container around the through hole, and the sleeve is provided with an insertion portion to be inserted into the through hole and an abutting portion located around the insertion portion and abutting against the flat surface of the closed container. The contact portion of the sleeve and the flat surface of the closed container are fixed to each other by projection welding.

According to the present invention, the closed container is provided with the electric element and the compression element driven by the electric element, and the refrigerant sucked from the refrigerant introduction pipe is compressed by the compression element and discharged from the refrigerant discharge pipe. In the hermetic electric compressor, a sleeve is attached corresponding to the through hole formed in the curved surface of the closed container, and a sleeve to which the refrigerant introduction pipe and the refrigerant discharge pipe are connected is provided, and the outer surface of the closed container around the through hole is flat. In addition to forming a surface, the sleeve is formed with an insertion portion to be inserted into the through hole and an abutting portion located around the insertion portion and abutting against a flat surface of the hermetically sealed container. Since the flat surface of the closed container is fixed by projection welding, the flatness of the sleeve with respect to the inner diameter of the closed container can be secured by the contact between the flat surface of the closed container and the contact portion of the sleeve. As a result, it is possible to improve the productivity and the accuracy by making the perpendicularity of the sleeve without using a jig or the like.

The hermetic electric compressor according to a second aspect of the present invention is characterized in that the flat surface is recessed around the through hole.

According to the second aspect of the present invention, in addition to the above, since the flat surface is recessed around the through hole, the squareness of the sleeve is further increased by the outer surface of the sleeve buried in the recessed portion of the closed container and the recessed portion. This makes it possible to hold it more accurately.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view of an internal intermediate pressure type multi-stage (two-stage) compression type rotary compressor 10 provided with first and second rotary compression elements 32, 34 as an embodiment of the hermetic electric compressor of the present invention. 2 is a front view of the rotary compressor 10, FIG. 3 is a side view of the rotary compressor 10, FIG. 4 is another vertical sectional view of the rotary compressor 10, and FIG. 5 is another vertical sectional view of the rotary compressor 10. Is a plan sectional view of the electric element 14 portion of the rotary compressor 10, and FIG. 7 is a rotary compressor 1
The enlarged sectional views of the rotary compression mechanism unit 0 of 0 are respectively shown.

In each figure, 10 is carbon dioxide (C
This is an internal intermediate pressure type multi-stage compression type rotary compressor using O ₂ ) as a refrigerant.
Reference numeral 0 denotes a cylindrical hermetic container 12 made of a steel plate, and an electric element 14 arranged and housed above the inner space of the hermetic container 12.
And the electric element 14 disposed below the electric element 14.
First rotary compression element 32 driven by the rotary shaft 16 of
The rotary compression mechanism portion 18 includes the (first stage) and the second rotary compression element 34 (second stage). The height dimension of the rotary compressor 10 of the embodiment is 220 mm (outer diameter 120 mm), and the height dimension of the electric element 14 is about 80 mm.
(Outer diameter 110 mm), the height dimension of the rotary compression mechanism portion 18 is about 70 mm (outer diameter 110 mm), and the distance between the electric element 14 and the rotary compression mechanism portion 18 is about 5 mm. The excluded volume of the second rotary compression element 34 is set smaller than the excluded volume of the first rotary compression element 32.

The closed container 12 has a thickness of 4.5 mm in the embodiment.
It is composed of the steel plate of
4 and a cylindrical container body 1 that houses the rotary compression mechanism 18
2A and a substantially bowl-shaped end cap (lid) 12B that closes the upper opening of the container body 12A, and a circular mounting hole 12D is formed at the center of the upper surface of the end cap 12B. A terminal (wiring is omitted) 20 for supplying electric power to the electric element 14 is attached to the attachment hole 12D.

In this case, the end cap 12B around the terminal 20 is formed with a stepped 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 element 14 has 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 plates are laminated, and a stator coil 2 wound around the teeth of the laminated body 26 by a direct winding (concentrated winding) method.
8 (FIG. 6). Like the stator 22, the rotor 24 is also formed of a laminated body 30 of electromagnetic steel plates, and a permanent magnet MG is inserted into the laminated body 30.

An intermediate partition plate 36 is sandwiched between the first rotary compression element 32 and the second rotary compression element 34. That is, the first rotary compression element 32 and the second rotary compression element 34 include an intermediate partition plate 36, cylinders 38 and cylinders 40 arranged above and below the intermediate partition plate 36, and inside the upper and lower cylinders 38 and 40. And the upper and lower rollers 46 and 48 which are fitted to the upper and lower eccentric portions 42 and 44 provided on the rotary shaft 16 with a phase difference of 180 degrees and rotate eccentrically.
Upper and lower vanes 5 to be described later, which abut against the upper and lower cylinders 38 and 40 to divide them into the low pressure chamber side and the high pressure chamber side, respectively.
0 (the lower vane is not shown) and an upper support member as a support member that also serves as a bearing for the rotary shaft 16 by closing the upper opening surface of the upper cylinder 38 and the lower opening surface of the lower cylinder 40. 54 and the lower support member 56.

Upper support member 54 and lower support member 56
The suction ports 161 and 162 at the upper and lower cylinders 3.
Suction passages 58, 60 communicating with the insides of 8, 40, respectively.
Then, the recessed discharge silencing chambers 62 and 64 are formed, and the openings of the discharge silencing chambers 62 and 64 are closed by covers. That is, the discharge muffling chamber 62 is closed by the upper cover 66 as a cover, and the discharge muffling chamber 64 is closed by the lower cover 68 as a cover.

In this case, a bearing 54A is formed upright in the center of the upper support member 54, and a cylindrical bush 122 is attached to the inner surface of the bearing 54A. Also,
A bearing 56A is formed through the center of the lower support member 56, and the cylindrical bush 1 is also formed on the inner surface of the bearing 56A.
23 is attached. These bushes 122, 123
Is made of a material with good slidability as described below,
The rotary shaft 16 is held by the bearing 54A of the upper support member 54 and the bearing 56A of the lower support member 56 via the bushes 122 and 123.

In this case, the lower cover 68 is made of a donut-shaped circular steel plate and is fixed to the lower support member 56 from the bottom at four peripheral portions by the main bolts 129. The lower surface opening of the discharge muffling chamber 64 that communicates with the inside of the lower cylinder 40 of the first rotary compression element 32 is closed. The tips of the main bolts 129 ... Are screwed into the upper support member 54. The inner peripheral edge of the lower cover 68 projects inward from the inner surface of the bearing 56A of the lower support member 56, whereby the lower end surface of the bush 123 is held by the lower cover 68 and prevented from falling off (FIG. 9). FIG. 10 shows the lower surface of the lower support member 56, and 128 is the discharge port 41 in the discharge muffling chamber 64.
Is a discharge valve of the first rotary compression element 32 that opens and closes.

Here, the lower support member 56 is made of an iron-based sintered material (or may be a casting), and the surface (lower surface) on which the lower cover 68 is attached has a flatness of 0.
After being processed to 1 mm or less, steam treatment is added. By this steam treatment, the surface on the side to which the lower cover 68 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 68 and the lower support member 56.

The discharge muffler chamber 64 and the electric element 14 side of the upper cover 66 in the closed container 12 are communicated with each other by a communication passage 63 which is a hole penetrating the upper and lower cylinders 38, 40 and the intermediate partition plate 36. (Fig. 4). In this case, the communication passage 6
An intermediate discharge pipe 121 is erected at the upper end of the stator 3. The intermediate discharge pipe 121 is a stator 22 of the upper electric element 14.
It is directed to the gap between the adjacent stator coils 28, which are wound on each other (FIG. 6).

Further, the upper cover 66 closes the upper opening of the discharge muffling chamber 62 which communicates with the inside of the upper cylinder 38 of the second rotary compression element 34 at the discharge port 39, and the closed container 1
The inside of 2 is partitioned into the discharge silencing chamber 62 and the electric element 14 side. This upper cover 66 has a thickness of 2 mm or more 1 as shown in FIG.
The upper support member 54 has a diameter of 0 mm or less (most preferably 6 mm in the embodiment) and is formed of a substantially donut-shaped circular steel plate having a hole through which the bearing 54A of the upper support member 54 passes. With the beaded gasket 124 sandwiched between and, the peripheral portion is fixed to the upper support member 54 from above by four main bolts 78 ... Through the gasket 124. The tips of the main bolts 78 ... Are screwed into the lower support member 56.

By making the thickness of the upper cover 66 such that it can withstand the pressure of the discharge muffling chamber 62, which is higher than the pressure in the closed container 12, it can be made compact and the electric element 1
It is also possible to secure an insulation distance from 4. Further, an O-ring 126 is provided between the inner peripheral edge of the upper cover 66 and the outer surface of the bearing 54A (FIG. 12). By sealing the bearing 54A side by the O-ring 126, it is possible to sufficiently seal the inner peripheral edge of the upper cover 66 and prevent the gas leak, and it is possible to increase the volume of the discharge muffling chamber 62 and It is not necessary to fix the inner peripheral edge side of the upper cover 66 to the bearing 54A by the ring. Here, in FIG. 11, 127 is a discharge valve of the second rotary compression element 34 that opens and closes the discharge port 39 in the discharge muffling chamber 62.

Next, the intermediate partition plate 3 for closing the lower opening surface of the upper cylinder 38 and the upper opening surface of the lower cylinder 40.
In FIG. 6, a position corresponding to the suction side in the upper cylinder 38 extends from the outer peripheral surface to the inner peripheral surface as shown in FIGS. 13 and 14, and the outer peripheral surface and the inner peripheral surface communicate with each other to form an oil supply passage. The through hole 131 is formed, and the sealing material 132 on the outer peripheral surface side of the through passage 131 is press-fitted to seal the outer peripheral surface side opening. A communication hole 133 extending upward is formed in the middle of the through hole 131.

On the other hand, the suction port 161 of the upper cylinder 38
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, an oil hole 80 is formed in the rotary shaft 16 in the vertical direction about the shaft center.
And a lateral oil supply hole 82 communicating with the oil hole 80,
84 (also formed on the vertical eccentric portions 42 and 44 of the rotary 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 communicates with the oil hole 80 via these oil supply holes 82, 84.

As will be described later, since the inside pressure of the closed container 12 becomes an intermediate pressure, it becomes difficult to supply the oil into the upper cylinder 38 which becomes a high pressure in the second stage. , Pumped up from the oil sump at the bottom of the closed container 12 to raise the oil hole 80,
The oil discharged from No. 4 enters the through hole 131 of the intermediate partition plate 36 and is supplied to the suction side (suction port 161) of the upper cylinder 38 from the communication holes 133 and 134.

In FIG. 16, L shows the pressure fluctuation on the suction side of the upper cylinder 38, 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 upper cylinder 38 (suction pressure) becomes lower than the pressure on the inner peripheral surface side of the intermediate partition plate 36 due to suction pressure loss during the suction process. During this period, oil is supplied from the through hole 131 and the communication hole 133 of the intermediate partition plate 36 into the upper cylinder 38 through the communication hole 134 of the upper cylinder 38.

As described above, the upper and lower cylinders 38 and 40, the intermediate partition plate 36, the upper and lower support members 54 and 56, and the upper and lower covers 6
6 and 68 are respectively fastened from above and below by four main bolts 78 ... And main bolts 129 ..., but further, upper and lower cylinders 38, 40, intermediate partition plate 36, and upper and lower support members 5
4, 56 are fastened by auxiliary bolts 136, 136 located outside these main bolts 78, 129 (FIG. 4). The auxiliary bolt 136 is inserted from the upper support member 54 side, and the tip end is screwed into the lower support member 56.

The auxiliary bolt 136 is located near a guide groove 70, which will be described later, of the vane 50 described above.
By thus adding the auxiliary bolts 136 and 136 to integrate the rotary compression mechanism portion 18, the sealing performance against the extremely high pressure inside is ensured and the vicinity of the guide groove 70 of the vane 50 is ensured. Since it is tightened, it is possible to prevent leakage of the high pressure back pressure applied to the vane 50.

On the other hand, inside the upper cylinder 38, a guide groove 70 for accommodating the vane 50 and an accommodating portion 70A located outside the guide groove 70 for accommodating a spring 76 as a spring member are formed. The storage section 70A is open to the guide groove 70 side and the closed container 12 (container body 12A) side (FIG. 8). The spring 76 contacts the outer end of the vane 50 and constantly urges the vane 50 toward the roller 46. Further, a metal plug 137 is provided in the housing portion 70A of the spring 76 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 upper cylinder 38, that is, the distance between the outer end of the storage portion 70A and the container body 12A of the closed container 12 is smaller than the distance from the O-ring 138 to the end of the plug 137 on the closed container 12 side. It is set. Then, a high pressure, which is the discharge pressure of the second rotary compression element 34, is applied as a back pressure to a back pressure chamber (not shown) communicating with the guide groove 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 accommodating portion 70A, it is possible to avoid the inconvenience that the upper cylinder 38 is deformed and the sealing performance between the upper cylinder 38 and the upper support member 54 is deteriorated, resulting in deterioration of performance. become. Even with such clearance fitting, the gap between the upper cylinder 38 and the closed container 12 is set smaller than the distance from the O-ring 138 to the end of the plug 137 on the closed container 12 side, so that the spring 76 side. Even if the plug 137 moves in the direction in which it is pushed out of the storage portion 70A due to the high pressure (back pressure of the vane 50), the O-ring 138 is still inside the storage portion 70A when it abuts against the closed container 12 and is prevented from moving. Since it is in position and sealed, there is no problem with the function of the plug 138.

By the way, the connecting portion 90 which connects the upper and lower eccentric portions 42 and 44 integrally formed with the rotating shaft 16 with a phase difference of 180 degrees has a sectional shape of the rotating shaft 16.
The non-circular shape, for example, a rugby ball shape, has a larger cross-sectional area than the circular cross-section and has rigidity (FIG. 17). That is, the vertical eccentric parts 42, 4 provided on the rotary shaft 16
The cross-sectional shape of the connecting portion 90 connecting the four is the vertical eccentric portion 42
The wall thickness is increased in the direction orthogonal to the eccentric direction of 44 (hatched portion in the figure).

As a result, the cross-sectional area of the connecting portion 90 which connects the vertical eccentric portions 42 and 44 integrally provided on the rotary shaft 16 is increased, the second moment of area is increased, and the strength (rigidity) is increased to improve the durability. It improves the reliability and reliability. Especially when two-stage compression of a refrigerant having a high working pressure is performed, the load applied to the rotating 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 upper eccentric portion 42 is O1.
And the center of the lower 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. As a result, the rotary shaft 16 is chucked by the cutting machine and the vertical eccentric parts 42 and 44 and the connecting part 9 are attached.
When cutting 0, after processing the eccentric portion 42, only the radius is changed to process one surface of the connecting portion 90, the chuck position is changed to process the other surface of the connecting portion 90, and only the radius is changed. Then, the work of machining the eccentric portion 44 becomes possible. As a result, the number of times of re-chucking the rotary shaft 16 is reduced, and the productivity is remarkably improved.

In this case, as the refrigerant, carbon dioxide (CO ₂ ) as an example of carbon dioxide gas which is a natural refrigerant is used in consideration of flammability, toxicity and the like, and oil as a lubricating oil is used. As the oil, existing oils such as mineral oil, alkylbenzene oil, ether oil and ester oil are used.

On the curved side surface of the container body 12A of the closed container 12, the suction passages 58 and 60 of the upper support member 54 and the lower support member 56, the discharge muffling chamber 62 and the upper cover 66 (at the lower end of the electric element 14). Cylindrical sleeves 141, 142, 143, and 144 are welded and fixed to positions corresponding to (substantially corresponding positions), respectively. Sleeve 14
1 and 142 are vertically adjacent to each other, and the sleeve 143 is substantially on the diagonal line of the sleeve 141. Also, sleeve 1
44 is at a position shifted from the sleeve 141 by approximately 90 degrees.

Now, referring to FIG. 19, the sleeve 14 is used.
The mounting structure of 1 to 144 (the sleeve 142 is shown in the figure) will be described. Circular through holes 171 are formed in the curved surface of the container body 12A of the closed container 12 at positions where the sleeves 141 to 144 are attached (in this case, four places), and the through holes 171 on the outer surface side of the container body 12A are formed. A circular concave portion 172 is countersunk around the periphery, and the concave portion 17
Around the through hole 171 which is the bottom surface of the second flat surface 1 which is parallel to the tangent to the inner diameter of the container body 12A of the closed container 12.
73 is formed.

On the other hand, an insertion portion 174 having a diameter smaller than the outer diameter is formed at the end of the sleeve 142 (similarly for other sleeves) on the closed container 12 side, and the insertion portion 174 is formed.
A flat contact portion 176 that is orthogonal to the axial direction of the sleeve 142 is formed around the periphery of the sleeve 142.
A projection welding projection 177 is formed around the circumference of the projection.

Although the projection 177 is shown large in FIG. 19 for the sake of explanation, it is actually a very small projection size. In addition, the inner diameter of the recessed portion 172 is equal to that of the sleeve 142.
Is a size that can be inserted with a minimum clearance, and the insertion portion 1
The outer diameter of 74 is also dimensioned so that it can be inserted into the through hole 171 with a minimum clearance.

Then, the sleeve 142 is attached to the container body 12A.
When fixing to, the insertion portion 174 of the sleeve 142 is inserted into the through hole 171 of the container body 12A, and further, the contact portion 176 portion of the sleeve 142 is embedded in the recessed portion 172. Then, the contacting portion 1 of the sleeve 142
76 (actually, the protrusion 177) contacts the flat surface 173 of the bottom of the recess 172. At this time, the flat surface 173 is parallel to the tangent line of the inner diameter of the container body 12A, and the contact portion 17
Since 6 is orthogonal to the axial direction of the sleeve 142, the sleeve 142 is at a right angle to the inner diameter of the container body 12A when the contact portion 176 and the flat surface 173 are in contact with each other (center of the container body 12A). Located on a straight line extending radially from the state protruding from the outer surface). In particular, the sleeve 142
Since the outer surface around the contact portion 176 is held by the inner surface of the recessed portion 172, it is easy to secure the squareness of the sleeve 142.

In this state, the projection 177 is melted by a welding tool (not shown) and the sleeve 142 is projection welded to the container body 12A. With this configuration, the sleeve 142 (141, 143,
The same can be said for 144). The squareness with respect to the inner diameter of the container body 12A can be accurately maintained.

The sleeve 1 attached in this way
One end of a refrigerant introducing pipe 92 for introducing a refrigerant gas into the upper cylinder 38 is inserted and connected in the inside of 41, and one end of the refrigerant introducing pipe 92 is communicated with the suction passage 58 of the upper cylinder 38. The refrigerant introduction pipe 92 passes through the upper side of the closed container 12 to reach the sleeve 144, and the other end is inserted and connected into the sleeve 144 and communicates with the closed container 12.

In the sleeve 142, the lower cylinder 4
One end of a refrigerant introduction pipe 94 for introducing the refrigerant gas to 0 is inserted and connected, and one end of this refrigerant introduction pipe 94 is communicated with the suction passage 60 of the lower cylinder 40. This refrigerant introducing pipe 94
The other end of is connected to the lower end of the accumulator 146. Further, a refrigerant discharge pipe 96 is inserted and connected in the sleeve 143, and one end of the refrigerant discharge pipe 96 has a discharge muffling chamber 62.
Be communicated to.

The accumulator 146 is a tank for separating the suction refrigerant into gas and liquid, and is the container body 1 of the closed container 12.
It is attached via a bracket 148 on the accumulator side to a bracket 147 on the closed container side welded and fixed to the upper side surface of 2A. The bracket 148 extends upward from the bracket 147 and holds the substantially central portion of the accumulator 146 in the vertical direction. In this state, the accumulator 146 is arranged along the side of the closed container 12.

The refrigerant introducing pipe 92, after coming out of the sleeve 141, bends to the right in the embodiment and then rises, so that the lower end of the accumulator 146 comes close to the refrigerant introducing pipe 92. Therefore, the refrigerant introduction pipe 94 that descends from the lower end of the accumulator 146 is routed so as to bypass the left side of the sleeve 141 opposite to the bending direction of the refrigerant introduction pipe 92 and reach the sleeve 142 (FIG. 3). ).

That is, the upper support member 38 and the lower support member 4
Refrigerant introduction pipes 92 and 94 communicating with the suction passages 58 and 60 of 0 are bent in the opposite directions in the horizontal direction when viewed from the closed container 12, whereby the vertical dimension of the accumulator 146 is enlarged. Therefore, even if the volume is increased, consideration is given so that the refrigerant introduction pipes 92 and 94 do not interfere with each other.

A flange 151 is formed around the outer surfaces of the sleeves 141, 143, 144.
A screw groove 152 is formed around the outer surface of 42. A coupler for connecting the airtight test pipe can be removably engaged with the flange 151, and a connector for connecting the airtight test pipe can be screwed to the thread groove 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, the upper and lower sleeves 141 and 142 are
Since the flange portion 151 is formed on the one sleeve 141 and the thread groove 152 is formed on the other sleeve 142, the situation in which two couplers having a size larger than that of the connector are adjacently attached is eliminated, and the sleeve is eliminated. 141 and 14
Even when the interval between the two is narrow, the airtight test pipe can be connected to the sleeves 141 and 142 using the narrow space.

The rotary compressor 10 of the embodiment is used in the refrigerant circuit of the water heater 153 as shown in FIG. That is, the refrigerant discharge pipe 96 of the rotary compressor 10
Is connected to the inlet of a gas cooler 154 for heating water. The gas cooler 154 is provided in a hot water storage tank (not shown) of the hot water supply device 153. The pipe exiting the gas cooler 154 reaches the inlet of the evaporator 157 through the expansion valve 156 as a pressure reducing device, and the outlet of the evaporator 157 is connected to the refrigerant introducing pipe 94. 2 and 3 from the middle of the refrigerant introducing pipe 92.
Although not shown in the figure, a defrost pipe 158 forming a defrosting circuit branches and is connected to a refrigerant discharge pipe 96 reaching the inlet of the gas cooler 154 via an electromagnetic valve 159 as a flow path control device. In FIG. 18, the accumulator 146
Is omitted.

The operation of the above configuration will be described below. In the heating operation, the solenoid valve 159 is closed. Electric element 1 via terminal 20 and wiring not shown
When the stator coil 28 of No. 4 is energized, the electric element 14
Starts and the rotor 24 rotates. By this rotation, the upper and lower rollers 46 and 48 fitted in the upper and lower eccentric portions 42 and 44 integrally provided with the rotating shaft 16 eccentrically rotate in the upper and lower cylinders 38 and 40.

As a result, the low pressure (first stage suction pressure LP: 4 MPaG) sucked from the suction port 162 to the low pressure chamber side of the lower cylinder 40 via the refrigerant introduction pipe 94 and the suction passage 60 formed in the lower support member 56. ) The refrigerant gas is
The intermediate pressure (M
P1: 8 MPaG), and is discharged from the high pressure chamber side of the lower cylinder 40 into the closed container 12 from the discharge port 41, the discharge muffling chamber 64 formed in the lower support member 56, 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, 28 wound around the stator 22 of the upper electric element 14, the refrigerant gas having a relatively low temperature is still present. Can be positively supplied in the direction of the electric element 14, and the temperature rise of the electric element 14 can be suppressed. Moreover, by this, the closed container 1
The inside of 2 becomes an intermediate pressure (MP1).

The intermediate pressure refrigerant gas in the closed container 12 is discharged from the sleeve 144 (the intermediate discharge pressure is equal to the above-mentioned MP value).
1) The refrigerant is introduced into the low pressure chamber side of the upper cylinder 38 from the suction port 161 through the refrigerant introduction pipe 92 and the suction passage 58 formed in the upper support member 54 (second-stage suction pressure MP
2). The sucked intermediate-pressure refrigerant gas is compressed in the second stage by the operation of the roller 46 and the vane 50 to become high-temperature high-pressure refrigerant gas (second-stage discharge pressure HP: 12 MPa.
G) From the high pressure chamber side, the gas flows into the gas cooler 154 through the discharge port 39, the discharge muffling chamber 62 formed in the upper support member 54, and the refrigerant discharge pipe 96. At this time, the refrigerant temperature has risen to approximately + 100 ° C., and the high-temperature and high-pressure refrigerant gas radiates heat to heat the water in the hot water storage tank to approximately +
It produces hot water at 90 ° C.

On the other hand, the refrigerant itself is cooled in the gas cooler 154 and exits the gas cooler 154. Then, after being decompressed by the expansion valve 156, it flows into the evaporator 157 and evaporates, and the accumulator 146 (not shown in FIG. 18).
After that, the cycle of being sucked into the first rotary compression element 32 from the refrigerant introduction pipe 94 is repeated.

In particular, in an environment of low outside temperature, frost is formed on the evaporator 157 by such heating operation. In that case, the solenoid valve 159 is opened, the expansion valve 156 is fully opened, and the evaporator 157 is defrosted. As a result, the medium-pressure refrigerant (including a small amount of high-pressure refrigerant discharged from the second rotary compression element 34) in the closed container 12 reaches the gas cooler 154 through the defrost pipe 158. The temperature of this refrigerant is about +50 to + 60 ° C., and the gas cooler 154 does not dissipate heat, but the refrigerant initially absorbs heat. The refrigerant discharged from the gas cooler 154 is the expansion valve 1
It passes through 56 and reaches the evaporator 157. That is,
The evaporator 157 is substantially directly supplied with the refrigerant having a substantially intermediate pressure and having a relatively high temperature without being decompressed, whereby the evaporator 157 is heated and defrosted.

Here, when the high-pressure refrigerant discharged from the second rotary compression element 34 is supplied to the evaporator 157 without depressurization and defrosted, the expansion valve 156 is fully opened and the first rotation is performed. The suction pressure of the compression element 32 rises, which causes the first
The discharge pressure (intermediate pressure) of the rotary compression element 32 is increased.
This refrigerant is discharged through the second rotary compression element 34, but because the expansion valve 156 is fully open, the second rotary compression element 3
Since the discharge pressure of No. 4 becomes the same as the suction pressure of the first rotary compression element 32, a pressure reversal phenomenon occurs between the discharge (high pressure) and suction (intermediate pressure) of the second rotary compression element 34. I will end up. However, since the refrigerant gas at the intermediate pressure discharged from the first rotary compression element 32 is taken out from the closed container 12 to defrost the evaporator 157 as described above, the reversal phenomenon of the high pressure and the intermediate pressure. Will be able to prevent.

The hermetic electric compressor is not limited to the internal intermediate pressure type multi-stage compression type rotary compressor as in the embodiment but is also effective for a single cylinder rotary compressor. Further, although the rotary compressor 10 is used in the refrigerant circuit of the hot water supply device 153 in the embodiment, the present invention is not limited to this and is also effective when used for heating the room.

[0058]

As described above in detail, according to the present invention, an electric element and a compression element driven by the electric element are provided in a closed container, and the refrigerant sucked from the refrigerant introduction pipe is compressed by the compression element. In the hermetic electric compressor that discharges from the refrigerant discharge pipe, the sleeve is attached corresponding to the through hole formed in the curved surface of the closed container, and has a sleeve to which the refrigerant introduction pipe and the refrigerant discharge pipe are connected. A flat surface is formed on the outer surface of the closed hermetic container, and an insertion portion to be inserted into the through hole and a contact portion located around the insertion portion and abutting the flat surface of the closed container are formed on the sleeve. Since the abutting part of and the flat surface of the closed container were fixed by projection welding,
By contacting the flat surface of the closed container with the contact portion of the sleeve, it becomes possible to ensure the perpendicularity of the sleeve with respect to the inner diameter of the closed container. As a result, it is possible to improve the productivity and the accuracy by making the perpendicularity of the sleeve without using a jig or the like.

According to the second aspect of the present invention, in addition to the above, since the flat surface is recessed around the through hole, the squareness of the sleeve is further increased by the outer surface of the sleeve buried in the recessed portion of the closed container and the recessed portion. This makes it possible to hold it more accurately.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a rotary compressor as an embodiment of a hermetic electric compressor of the present invention.

FIG. 2 is a front view of the rotary compressor of FIG.

3 is a side view of the rotary compressor of FIG. 1. FIG.

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

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

8 is an enlarged sectional view of a vane portion of a second rotary compression element of the rotary compressor of FIG.

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

10 is a bottom view of a 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.

12 is a sectional view of an upper support member and an upper cover of the rotary compressor of FIG.

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

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

FIG. 17 is a cross-sectional view for explaining the shape of the connecting portion of the rotary shaft of the rotary compressor of FIG.

18 is a refrigerant circuit diagram of a hot water supply device to which the rotary compressor of FIG. 1 is applied.

FIG. 19 is a diagram illustrating a procedure for attaching the sleeve of the rotary compressor of FIG.

[Explanation of symbols]

10 Rotary compressor 12 airtight container 12A container body 14 Electric elements 16 rotation axes 18 Rotary compression mechanism 20 terminals 32 First rotary compression element 34 Second rotary compression element 36 Intermediate partition plate 38, 40 cylinders 39, 41 Discharge port 42 Eccentric part 44 Eccentric part 46 Laura 48 Roller 50 vanes 54 Upper support member 56 Lower support member 62 Discharge silencer 64 discharge silencer 66 Top cover 68 Lower cover 70 Guide groove 70A storage 76 Spring (Spring member) 78,129 Main bolt 90 Connection 92,94 Refrigerant introduction pipe 96 Refrigerant 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 146 Accumulator 147,148 Bracket 151 Tsuba 152 screw groove 153 water heater 154 gas cooler 156 expansion valve 157 evaporator 158 Defrost Tube 159 Solenoid valve 171 through hole 172 recess 173 flat surface 174 Insert 176 abutment

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Haruhisa Yamazaki             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Kenzo Matsumoto             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Kazuya Sato             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Takayasu Saito             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Toshiyuki Ehara             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Satoru Imai             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Atsushi Oda             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Takashi Sato             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Hiroyuki Matsumori             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. F term (reference) 3H029 AA05 AA13 AB03 BB31 BB32                       CC25

Claims (2)

[Claims] 1. A hermetically sealed system comprising an electric element and a compression element driven by the electric element in a closed container, wherein refrigerant sucked from a refrigerant introduction pipe is compressed by the compression element and discharged from a refrigerant discharge pipe. In the electric compressor, a sleeve is attached corresponding to the through hole formed in the curved surface of the closed container, and is provided with a sleeve to which the refrigerant introduction pipe and the refrigerant discharge pipe are connected, and the outer surface of the closed container around the through hole is flat. A surface is formed, and the sleeve is formed with an insertion portion to be inserted into the through hole and an abutting portion located around the insertion portion and abutting against a flat surface of the closed container. And a flat surface of the closed container fixed by projection welding. 2. The hermetic electric compressor according to claim 1, wherein the flat surface is recessed around the through hole.