JPS6140473A - Scroll type compressor - Google Patents

Abstract

PURPOSE:To partition a chamber into two parts, namely, a high pressure chamber and a low pressure one in an accurate manner as well as to facilitate the manufacture of an enclosed type scroll compressor ever so easy, by installing a cover for forming the high pressure chamber, which makes discharge gas into static pressure and feed it to the outside of a hermetically sealed vessel, in the back of a fixed element of the scroll compressor. CONSTITUTION:A cover 30 for forming a high pressure chamber, which makes the gas discharged out of a discharge port 23 into static pressure and feeds the gas to a refrigerant cycle via a discharge pipe 36, is airtightly installed in the back of a fixed element 18 of a scroll type compression mechanism part 51 housed inside a hermetically sealed vessel 11. Therefore, thermal deformation is in no case produced in a frame 14, the frame is lockable to the hermetically sealed vessel without taking account of sealability in an empty space between upper and lower parts of the vessel.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement of a scroll-type compression device in which a scroll-type compression mechanism is housed in a closed case.

[Technical background of the invention and its problems] A scroll-type pressure line device has been known as a low-pressure compression device. This compression device has a compression mechanism constructed by combining a pair of scroll blades in the axial direction, and has advantages such as small size, high efficiency, and low vibration.

By the way, such a scroll-type compression device generally has a frame fixed to a position slightly above the closed case in a form that vertically partitions the inside of the closed case, and a scroll-type compression device of 8M tM is installed above the frame. place,
Further, a motor for providing driving power to the scroll-type compressors is arranged below the frame, and lubricating oil is stored in the bottom of the sealed case. A scroll-type compression i-structure usually consists of a fixed element and a movable element arranged below the fixed element. A bearing hole is provided vertically through the frame, and the rotating shaft of the motor described above is rotatably supported by the bearing hole. Further, a joint consisting of an eccentric coupling and an Oldham's mechanism 4j4 is provided between the upper end of the rotating shaft and the movable element, and the action of this joint causes the movable element to perform a turning motion without rotation. Furthermore, a lower end of the rotating shaft of the motor is extended into the lubricating oil, and a hole is provided in the rotating shaft so that the lower end opening is located at the center of the lower end surface of the rotating shaft, and the The above lubricating oil is pumped up by the pump action and supplied to each sliding part, and these lubricating oils are returned to the bottom of the sealed case.

However, the conventional scroll type compression device configured as described above has the following problems. That is, a frame is provided to partition the inside of the sealed case into two rooms, and the movable element is located between the fixed element and the frame in one of the rooms formed by the frame, and the fixed element is located between the fixed element and the frame. is fixed to the frame, and a space formed on the outer surface side of the fixing element is provided with a scroll type compression mechanism.
This is a high-pressure chamber that aims to stabilize the high-pressure gas discharged from the chamber. Therefore, the above-mentioned high-pressure air is formed on one side of the frame, and low-pressure air is formed on the other side. Determined by the airtightness between the surface and the surface. For this reason, in conventional devices, gaps are created between the outer circumferential surface of the frame and the inner circumferential surface of the sealed case in order to improve airtightness between the two chambers and reduce loss. The outer circumferential surface of the frame is precisely welded to the inner circumferential surface of the sealed case over the entire circumference so that the outer circumferential surface of the frame is not formed. For this reason, there are problems in that it takes a long time to manufacture, increases the price of the entire device, and also causes thermal distortion in the frame due to the heat during welding, resulting in a decrease in assembly accuracy.

[Object of the invention] The present invention has been made in view of the above circumstances, and its purpose is to, despite the simple configuration,
It is an object of the present invention to provide a scroll type compression device that can reliably partition high-pressure air and low-pressure chambers, thereby facilitating manufacturing, realizing highly accurate assembly, and improving efficiency.

[Summary of the Invention] The present invention includes a sealed case containing lubricating oil at the bottom;
A frame is provided to partition the inside of the airtight case into a first and a second chamber, each of which is formed in a shape that forms a compression chamber between them by joining each other in the axial direction, and a fixed element and a movable element, each having scroll wings interlocking with each other, the movable element being located between the fixed element and the frame in the first chamber, and the fixed element being located between the fixed element and the frame; a scroll-type compression mechanism fixed to the
The second chamber includes a motor provided in the second chamber, and a means for causing the movable element to perform a rotational movement without rotation using the power of the motor to compress the high pressure compressed in the compression chamber. In a scroll type compression device configured to discharge gas from a gas discharge port provided in the fixed element, the scroll type compression device is airtightly fixed within the first chamber and to the outer surface of the fixed element, and the outer surface and the gas discharge port A cover for forming a high pressure chamber is provided to form a high pressure chamber that statically pressures the gas discharged from the airtight case and sends it out of the sealed case.

[Effect of the invention] With the above configuration, high pressure air can be
It is formed in the entire space surrounded by the outer surface of the fixing element and the cover for forming the high pressure chamber. Therefore, unlike conventional devices, there is no need to airtightly fix the outer peripheral surface of the frame to the inner peripheral surface of the sealed case, and a press-fitting method, spot welding method, screwing method, etc. can be used for this fixing. Therefore, the work of fixing the frame can be greatly facilitated, and the frame can be fixed without causing thermal distortion, so that not only the assembly time can be shortened, but also highly accurate assembly can be easily realized. Furthermore, since the high pressure air is formed by the outer surface of the fixing element and the cover as described above, airtightness between the high pressure air and the low pressure air can be easily and easily achieved without any troublesome work. This can be ensured with certainty. Therefore, efficiency can be improved.

[Embodiments of the invention] Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 11 indicates a vertically long sealed case, and this sealed case 11 is a cylindrical intermediate case 1.
2, and closing cases 13a and 13b welded to close both ends of the intermediate case 12. A frame 14 is fixed at an upper position inside the sealed case 11 to partition the inside of the sealed case 11 in the vertical direction and form a low pressure chamber Y below. A scroll type compression Ia structure 15 is arranged above the frame 14,
Also, below the frame 14 is the scroll type compression [v4
A motor 16 for providing driving power to 15 is arranged,
Furthermore, lubricating oil 17 is contained in the bottom of the sealed case 11.

The scroll type compression mechanism 15 is composed of a fixed element 18 and a movable element 19 arranged below the fixed element 18, as in the known one.

The fixing element 18 includes a disc-shaped end plate 20 and this mirror.
) an annular wall 2) protruding from the peripheral edge of one side of the plate 20;
A scroll blade 22 protruding from a portion surrounded by the annular wall 2) at a height approximately equal to that of the annular wall 2) and a mirror plate 20 are provided.
The discharge port 23 is provided approximately at the center of the discharge port 23. The inner edge of the annular wall 2) is formed into a notched surface 24, such as a curved surface with an appropriate curvature or a tapered surface as shown in FIGS. 2(a) and 2(b). In the fixing element 18 configured as described above, the peripheral edge of the annular wall 2) is airtightly fixed to the upper peripheral edge of the frame 14 with bolts 25 with the protruding direction of the annular wall 2) and the scroll blades 22 facing downward. There is.

On the other hand, the movable element 19 includes a mirror plate 26 having an outer diameter slightly larger than the inner diameter of the annular wall 2), and a scroll blade protruding from one surface of the mirror plate 26 at a height approximately equal to the height of the scroll blade 22. 27 and a cylindrical portion 28 protruding from the other central portion of the chain plate 26. As shown in FIGS. 3(a) and 3(b), the peripheral edge of the mirror plate 26 on the side on which the scroll R27 protrudes is formed into a cutout surface 29 such as a tapered surface. In the movable element 19 configured as described above, the scroll blades 27 and the scroll 1I22 are engaged with each other with the protruding direction of the scroll blades 27 being upward, and the peripheral portion of the mirror plate 26 and the annular wall 2) are engaged with each other. The end face and the end face of the scroll blade 27 and the mirror plate 20 and the end face of the scroll blade 22 and the mirror plate 26 are mounted so as to be in sliding contact with each other, and this mounted state is the same as that of the mirror plate 2.
6 and the frame 14, and is held by an Oldham machine 11240, which will be described later.

A cover 30 for forming a high-pressure vertical is mounted on the upper surface of the mirror plate 20 to form a high-pressure air X between the cover 30 and the upper surface. The cover 30 is formed into a bottomed cylindrical shape whose inner diameter is approximately equal to the outer diameter of the end plate 20, and a flange portion 31 extending outward is formed inside the open end of the cylindrical portion. The cover 30 formed as described above is fitted with its opening side over the outer periphery of the end plate 20 with the gasket 32 positioned between the flange 131 and the upper surface of the annular wall 2 of the fixing element 18. In this state, the flange portion 31 is integrally fastened to the annular wall 2) by the bolts 25. Above the discharge port 23 in the high pressure air X is a disc-shaped baffle plate 3 that functions as a gas-liquid separator.
3 is arranged horizontally, and this panful plate 33 is fixed to the so-called earthen wall of the cover 30 via a small number of supporting members 34. Further, a hole 35 is provided in the center of the upper wall of the cover 30, and one end of a discharge pipe 36 is connected to this hole 35 in an airtight manner. The other end of the discharge pipe 36 is guided to the outside by passing through the closed case '13a in an airtight manner.

Thus, the Oldham mechanism 40 has key grooves 418.41b provided at two locations on the same line drawn through the center of the mirror plate 26 at the lower peripheral edge of the mirror plate 26, and the key grooves 41a, 41b. (7) A keyway 42a provided on a line perpendicular to the arrangement direction and on the upper surface of the frame 14 as shown in FIG.

42b, and the key 1f on one side as shown in FIG.
It has keys 43a and 43b that fit into the holes 441a and 41b, and the key groove 42a on the other surface.

Ring 4 with keys 44a and 44b that fit into 42b
It consists of 5. On both sides of the ring 45, for example, mesh-like oil grooves 46 are actually formed to reduce sliding resistance, as shown in FIG. Moreover, each of the key grooves 42a, 42b, 41a, 41b
As shown in FIG. 6 by the key 142b, the inner surface of the bottle is provided with a stepped part 47 for reducing the sliding area with the key.
is formed.

A bearing hole 51 eccentric to the axis of the cylindrical portion 28 of the movable element 19 is provided through the frame 14 in the vertical direction, and the bearing hole 51 is located on the cylindrical portion 28 side of the bearing hole 51. The part is formed to have a large diameter. The frame structure on the larger diameter side is specifically constructed as shown in FIG. In other words, the legs also have an outer diameter approximately equal to the inner diameter of the sealed case 11, and an inner diameter of the annular wall 2.
) is formed with an annular wall 52 to which the annular wall 2) is tightened and fixed by a bolt 25,
The annular receiver that receives the ring 45 on the inside is formed with a surface 55 lowered one step, and the annular receiver that receives the thrust force reduction mechanism 59, which will be described later, is formed with a surface 56 that is further lowered one step on the inside. . The surface of the capacitor is divided into a plurality of parts in the circumferential direction by iM 57 provided radially, and at least one of the grooves 57 communicates with a hole 58 provided in the wall of the frame 14 that directly communicates the inside and outside. There is. Note that the key grooves 42a and 42b are formed on a receiving surface 55.

Specifically, the thrust force reducing mechanism 59 is shown in FIG.
As shown in a)(b)(cl), the annular receiver includes an annular body 60 fitted and supported by the surface 56, an annular groove 61 carved on the upper surface of this annular body 60, and an annular groove 61 on the upper surface. annular grooves 62.63 shallower and narrower than the annular groove 61 formed on the inner and outer sides of the annular groove 62.63;
Each part is attached to the inside so that it protrudes outward,
For example, it is composed of seal rings 64° and 65° made of tetrafluoroethylene. A tapered surface 66 is formed at the lower end of the outer circumferential surface of the seal ring 64, as shown in FIG. has been done. Further, at four positions in the circumferential direction of the annular groove 61, the annular groove 61 is connected to the annular groove 62, 63 at the same depth as the annular groove 61.
A bottomed hole 67 is formed to communicate with the. Inside the mirror plate 26, a first thrust force reduction i-structure 59 is provided.
Holes 68 allow the space surrounded by the annular body 6o, the seal rings 64, 65, and the lower surface of the end plate 26 to always communicate with the medium pressure ports s, s' of the compression WP in the attached state as shown in the figure. .69 is formed.

A rotating shaft 70 of the motor 16 is rotatably supported in the bearing hole 51 of the frame 14 .

The rotating shaft 70 has a large diameter portion 71 formed in a portion located in the large diameter portion of the bearing hole 51, and a small shaft 72 that fits into the aforementioned cylindrical portion 28 is protruded from this large diameter portion 71. There is. The rotating shaft 70 has a length such that its lower end penetrates into the lubricating oil 17, and the lower end is supported by a sub-bearing 73 fixed to the inner surface of the sealed case 11.

Inside the rotating shaft 70, there is a hole 9 through which oil 17 is pumped up to the bearing surface and the fitting part between the small shaft 72 and the cylindrical part 28 by a centrifugal pump action.
0 is formed. The shape of the entrance portion of this hole 90, that is, the portion located at the lower end of the rotating shaft 70, includes a portion 91 extending upward from the center of the lower end surface of the rotating shaft 70, and a portion 92 extending radially from this portion 91. And this part 9
2 and a portion 93 extending vertically at the peripheral edge position within the rotating shaft 70 so as to intersect at right angles.

The motor 16 has a rotor 100 inside and a stator 10 inside.
1 is placed on the outside, and a stator 101 is fixed to the inner surface of an intermediate case 12.

Further, a space between the scroll type compression mechanism 15 and the motor 16, that is, a low pressure WY A suction pipe 111 is connected in a communicating relationship.

In addition, 114 in FIG. 1 indicates a guide path provided on the outer surface of the end plate 20, the annular wall 2), and the frame 14 in order to return the lubricating oil pushed out into the high-pressure tube X downward from the frame 14. 115 indicates a balance weight, 116 indicates a power supply connection t1M4 to the motor 16, and 117
indicates a hole through which lubricating oil passes. Note that, in the figure, a means for preventing the gas in the high pressure vX from flowing back into the low pressure air Y through the compression chamber P when the operation is stopped, specifically, a check valve is omitted.

Next, the operation of the compression device configured as described above will be explained.

First, when power is supplied to the motor 16, the rotating shaft 70 starts rotating. This rotation is smoothly maintained by both the bearing hole 51 and the sub bearing 73. The rotational force of the rotating shaft 70 is then transmitted to the movable element 19. The cylindrical portion 28 of the movable element 19 has a small shaft 72 provided eccentrically with respect to the rotation axis 7o.
Since the movable element 19 is fitted with the movable element 19 and supported by the Oldham mechanism 40, the movable element 19 performs a turning movement without rotation. Therefore, the scroll blades 27 provided on the movable element 19 also perform a swirling motion.

゛Accompanying to this swirling movement, the volume of the compression chamber P formed between the scroll 7R22 and the scroll blade 27 is periodically reduced, and the compressed gas is thereby discharged from the discharge port 23 into the high pressure gradation X. is discharged. On the other hand, when the movable element 19 pivots as described above, cutout surfaces 24 and 29 are formed at the upper peripheral edge of the end plate 26 of the movable element 19 and the inner edge of the annular wall 2) of the fixed element 18. It is effective that the peripheral part of the compression chamber P is
The receiver formed in is always in communication with the space on the surface 55. The space communicates with the hole 58 via grooves 57 provided radially in the frame 14, and the hole 58
is connected to the suction pipe 111 via the low pressure air Y, so the low pressure gas eventually flows from the suction pipe 111 to the low pressure ffY to the hole 5.
8 to 7 are sucked into the low pressure boat in the compression chamber P via the space on the surface 55, and here the function as a compression device is exhibited.

On the other hand, when the motor 16 rotates as described above, a portion of the lubricating oil 17 is pumped upward into the hole 90 by the action of the centrifugal pump due to the shape of the hole 90. After the oil lubricates the inner circumferential surface of the bearing hole 51, it lubricates the fitting part between the small shaft 72 and the cylindrical part 28, and then the oil lubricates the inner peripheral surface of the bearing hole 51.
The part where the Oldham 1141140 is installed is lubricated through the hole 58, and then part of it flows down from the hole 58, and the rest enters the compression chamber P and lubricates the sliding part in the compression chamber P. Lubricate. Then, it entered the compression chamber P &lWj
The oil passes through the discharge port 23 together with the high pressure gas to the high pressure chamber
guided inward. In this case, a portion of the mixture of gas and lubricating oil flows along the lower surface of the baffle plate 33, but due to the difference in quality between the gas and the lubricating oil, the lubricating oil falls onto the upper surface of the end plate 20, and the gas After flowing along the lower surface of the baffle plate 33, the water turns around and passes between the baffle plate 33 and the earthen wall of the cover 30, and flows into the discharge pipe 36 after being made sufficiently static pressure. Therefore, gas and lubricating oil are completely separated. The lubricating oil is then pushed back to the bottom of the sealed case 11 through the guide path 114 due to the pressure difference between the high pressure chamber X and the low pressure vY. Therefore, high pressure gas containing no lubricating oil is discharged from the discharge pipe 113.

Hiroshi: As mentioned above, when the movable element 19 rotates and performs the compression operation, the pressure inside the compression chamber P becomes high, so the movable element 19 receives a downward thrust force, and this force 173. The tf 440 and the receiver of the frame 14 touch the surface 55, etc., and there is a possibility that a seizure phenomenon may occur in these elements. However, in the case of this embodiment, the thrust force reduction mechanism 59 prevents the occurrence of the seizure phenomenon in the following manner.

That is, the annular space surrounded by the annular body 60 degree seal ring 64, 65 of the thrust force reducing device 59 and the end plate 26 is always connected to the so-called intermediate pressure ports s, s of the compression chamber P through the holes 68, 69. ' is familiar to me. Therefore, the chain plate 26 receives an upward force due to the gas pressure in the annular space, and the presence of this force reduces the downward thrust force applied to the mirror plate 26. This reduction prevents the occurrence of burn-in development. In addition, the movable element 19
The downward thrust force applied to the compressor pulses as the position between the compression chambers changes. Therefore, the thrust force is reduced t! s
Although there is a risk that high pressure gas may leak from the structure 59 to the low pressure side, in this embodiment, as shown in FIG.
and an annular groove 62.6 in which a sealing ring 64.65 is fitted.
Since the seal rings 64 and 65 are provided with bottomed holes 67 that communicate with the mirror plate 3, the seal rings 64 and 65 are always subjected to the force shown by the solid arrows in FIG.
A pressing force acts on the lower surface of 6. Therefore, this pressing prevents high pressure gas from leaking.

In this way, the cover 30 is attached to the outer surface of the fixing element 18, and the high pressure chamber X is formed by this cover 30 and the outer surface of the fixing element 18. Therefore, the airtightness between the high pressure chamber X and the low pressure chamber Y is completely unrelated to the mounting state of the frame 14.

Therefore, the frame 14 can be fixed to the inner surface of the sealed case 11 using an extremely simple fixing method such as a press-fitting method, a spot welding method, a screwing method, etc., and which does not cause thermal distortion or the like to the frame 14. Therefore, assembly as designed, that is, with high precision, can be easily achieved. Furthermore, since the airtightness between the high-pressure chamber X and the low-pressure chamber Y can be improved compared to conventional devices, efficiency can also be improved, and the above-mentioned effects can be obtained after all.

Note that the present invention is not limited to the embodiments described above. That is, in the embodiment, the gasket 32 is interposed between the joint surfaces of the cover 30 and the fixing element 18 to maintain the airtightness of the joint, but the gasket can be omitted by mirror-finishing both joint surfaces. You may also do so. In addition, in the embodiment, a panful plate 3 is provided in the high pressure chamber
3 are arranged horizontally so that the baffle plate 33 can perform the medical function as a gas-liquid separator, but the gas-liquid separator is not limited to such a configuration.

Furthermore, in the embodiment, the scroll-type pressure mechanism is placed above and the motor is placed below, but the present invention is not limited to this, and the motor is installed with its axial center line horizontal. Of course, it can also be applied to things that are done.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view of a scroll type compression device according to an embodiment of the present invention, FIG. 2(a) is a bottom view of a fixing element in the same device, and FIG. Figure 3 is a cross-sectional view of the installation condition taken along line A and viewed in the direction of the arrow.
a) is a top view of the movable elements in the device;
) is a sectional view taken along line B-B in (a>), Figure 4 is a partially cutaway exploded perspective view showing only the upper part of the frame of the same device, and Figure 5 is a main part of the Oldham mechanism in the same device. A plan view, FIG. 6 is a diagram for explaining the shape of the keyway of the Oldham mechanism, FIG. 7(a) is a top view of the thrust force reduction structure incorporated in the same device, and FIG. A view taken along line C-C in (a), and (C) is a diagram for explaining the shape of a seal ring incorporated in the mechanism. 11... Airtight case, 14... Frame, 15...
・Scroll type compression binding mechanism, 16...Motor, 17...
・Status lubricant, 18...Fixed element, 19...Movable element,
22.27...Scroll blade, 23...Discharge port, 3
o...Cover for high pressure seedling formation, 32...Gasket, 36...Discharge pipe, 4o...Oldham Isogaku, 51...
... Bearing hole, 70 ... Rotating shaft, 73 ... Secondary bearing, 9
0... Hole for centrifugal pump, 100... Rotor, 10
1... Stator, 111... Suction pipe, X... High pressure chamber, Y... Low pressure seedling. Applicant's agent Patent attorney Takehiko Suzue @4 Figure 5 Figure 61ZI Figure 7 (a)

Claims (3)

[Claims] (1) A sealed case containing lubricating oil at the bottom, a frame provided to partition the inside of the sealed case into a first and a second chamber, and a frame that is connected to each other in the axial direction to create a space between them. It is composed of a fixed element and a movable element each having a shape constituting a compression chamber and each having scroll blades that engage with each other within the compression chamber, and the fixed element and the frame are arranged in the first chamber. a scroll-type compression mechanism in which the movable element is positioned between, and the fixed element is fixed to the frame; a motor provided in the second chamber; and the movable element powered by the motor. Scroll-type compression means for performing gas compression by making a whirling motion without rotation, and the high-pressure gas compressed in the compression chamber is discharged from a gas discharge port provided in the fixed element. In the apparatus, the first chamber is airtightly fixed to the outer surface of the fixing element, and together with the outer surface, a high-pressure chamber is formed that statically pressures the gas discharged from the discharge port and sends it out of the sealed case. A scroll type compression device characterized by being provided with a cover for forming a high pressure chamber. (2) The scroll type compression device according to claim 1, wherein a gasket is inserted between a joint surface where the high pressure chamber forming cover and the outer surface of the fixing element join. (3) The scroll-type compression device according to claim 1, wherein the joint surfaces of the high-pressure chamber forming cover and the fixing element are mirror-finished.