JP2730818B2 - Scroll type electric compressor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type electric compressor having a scroll compression mechanism. FIG. 1 shows the structure of a conventional scroll compressor. [0003] A scroll compression mechanism 2 and a motor 3 are built in an airtight container 1. The scroll compression mechanism 2 includes an orbiting scroll 4, a fixed scroll 5, a frame 6, a crankshaft 7, and an orbiting mechanism 8. The orbiting scroll 4 has a spiral wrap 10 standing upright on a head plate 9, and a turning bearing 18 into which a turning mechanism 8 and a crank part 17 of a crankshaft 7 are inserted on the back of the head plate. The fixed scroll 5 has a spiral wrap 13 standing upright on a head plate 12, and a suction port 1 on an outer peripheral portion.
5, and a discharge port 16 is provided at the center of the end plate. The orbiting scroll 4 and the fixed scroll 5 are combined with their wraps inside, and the fixed scroll 5
And the frame 6 are fastened. The crankshaft 7 is supported by the frame 6, the motor 3 is installed on one side of the crankshaft 7, and the crank part 17 is inserted into a turning bearing 18 of the orbiting scroll 4. [0005] The suction port 15 of the fixed scroll 5 is connected to a suction pipe 19 provided in the closed vessel 1, and the closed vessel 1 is further provided with a discharge pipe 20. Thus, when the crankshaft 7 is rotated by the rotation of the motor 3, the orbiting scroll 4 performs the orbiting motion with respect to the fixed scroll 5 while maintaining the posture by the operation of the orbiting mechanism 8. With the above arrangement, the space formed by the respective end plates 9, 12 of the orbiting scroll 4 and the fixed scroll 5 and the respective wraps 10, 13 forms a pair of symmetric closed spaces. The closed space of the scroll decreases its volume as it moves to the center of the scroll,
The gas sucked from the inlet 15 is compressed and discharged from the outlet 16. The discharged gas is stored in the upper space 2 in the closed container 1.
1 flows into the spaces 24 and 25 via the passages 22 and 23, and is finally discharged from the discharge pipe 20. 26 is oil, 2
Reference numeral 7 denotes an oil supply device, which is provided at the lower end of the crankshaft 7. 28 and 29 are oil holes, and 30 is a balance weight. Here, as shown in FIG. 2, the orbiting scroll 4 and the fixed scroll 5 have a pair of minimum sealed spaces 31 and 32, respectively.
At the points 33, 34 corresponding to the winding start angles of the wraps 10, 13, respectively, when they are in contact with the inner wall surfaces 37, 36 of the corresponding wraps 13, 10, respectively. Open to the discharge chamber 35,
The orbiting scroll 4 is provided at a position substantially adjacent to the inner wall surface 36 of the wrap 10 and the fixed scroll 5 to the inner wall surface 37 of the wrap 13. As the orbiting scroll 4 further proceeds, the winding start points 33 and 34 of the wrap separate from the opposing inner wall surfaces 37 and 36, respectively, as shown in FIG. Formed, a pair of first
The gas in the second minimum sealed spaces 31 and 32 flows into the discharge chamber 35, and is discharged from the discharge chamber 35 to the upper space 21 through the discharge port 16. FIGS. 4 and 5 show prior examples by the present inventors having an enlarged discharge port as compared with the conventional scroll compressor shown in FIG. The enlarged discharge port in this prior example is also disclosed in, for example, US Pat. No. 3,874,827. The structure of the entire compressor in this prior example is the same as that of the conventional compressor, and a description thereof will be omitted. Further, the same reference numerals as those in the related art denote the same parts as in the related art, and perform the same functions. At the end of the compression stroke on the end plate of the fixed scroll, that is, at the position where the respective wraps 10 and 13 come into contact with the winding start points 33 and 34 to form the minimum sealed spaces 31 and 32, the fixed scroll wrap inner wall surface 37 and An enlarged discharge port 101 is provided substantially adjacent to the wrap wall 100 of the orbiting scroll. When the orbiting scroll further turns, the winding start points 33 and 34 of the wrap separate from the inner wall surfaces 37 and 36 of the wrap facing each other, and the discharge flow path 1 similar to the conventional one.
02, 103 are formed, and a pair of minimum enclosed spaces 31, 3 are formed.
The compressed gas in 2 flows to the discharge port 101 via the discharge chamber 35. Since the discharge port 101 is enlarged as compared with the discharge port 16 in FIG. 2, the outer wall surface 100 of the orbiting scroll moves across the contour of the discharge port 101, and the minimum sealed space 31 It communicates directly with the portion A of the discharge port 101. By doing so, the cross-sectional area of the discharge channel between the discharge port 101 and the minimum sealed space 31 is increased by the area of the portion A, and the discharge speed is increased by that amount. Can be secured. Further, the area of the discharge port 101 itself can be increased. In the conventional scroll compressor shown in FIG. 2, the compressed gas is discharged to the compressed gas discharge port 16 in the first and second minimum sealed spaces after the start of the discharge stroke. Outflow is performed in a well-balanced manner, but the moving speed of the wrap winding start points 33, 34 is slow, and it takes time for the discharge flow paths 38, 38 to form a sufficiently large flow path cross-sectional area. There is a drawback that the loss is large, the pressure in the pair of minimum sealed spaces 31 and 32 rises, the state becomes overcompressed, and the power consumption increases. Further, in the scroll compressor of the prior art shown in FIG. 4, a sufficient gas flow path can be secured by the enlarged discharge port 101 with respect to the first minimum sealed space 31. The second minimum sealed space 32 is no different from the conventional one, and is in an over-compressed state, which causes a problem of lack of balance with the minimum sealed space 31. The present invention has been made in view of the problems in the conventional and prior art scroll-type electric compressors shown in FIGS. 2 and 4, respectively. The first and second minimum sealed spaces 31, 32 provide an increased flow path cross-sectional area for each space in addition to the discharge flow paths 38, 38 (102, 103) at the tip of each wrap. By forming a discharge flow path and communicating with the expanded discharge port through the discharge flow path, the discharge loss is reduced, the above-described over-compression is prevented, and a well-balanced and stable operation is enabled. The present invention provides a scroll-type electric compressor which can solve not only the disadvantages of the conventional passage loss and overcompression but also the problem of lack of balance in the prior art. It is to. [0015] To achieve the above object, a scroll-type electric compressor according to a first aspect of the present invention comprises:
It has a fixed scroll and an orbiting scroll composed of a spiral wrap formed upright on the end plate, and combines both scrolls with the wrap facing inward. The first and second spaces formed on the outer wall surface of the scroll wrap move relative to each other so as to reduce the volume as the space moves toward the center of the scroll, and the gas sucked from the outer periphery of the scroll is removed. Compressed gas is discharged from a discharge port provided at the center of the fixed scroll as compressed gas. In a discharge stroke, the compressed gas in the first space has an enlarged contour of the discharge port. first scroll type which is arranged to flow out to the discharge port through the enlarged flow path formed by Yuku enters into space side In the dynamic compressor, and the expansion channel
Means for increasing the discharge flow path from the second space to balance
The discharge passage increasing means is provided at the tip of the fixed scroll wrap with a cut portion that is notched over the entire wrap height or partially cut so that the winding start angle is slightly larger than that of the orbiting scroll. among, wherein the compressed gas in the second space is configured to flow to the discharge port through the flow path of increased flow path cross-sectional area by the cutting unit. The scroll-type electric compressor according to the second aspect of the present invention is a spiral type rotary compressor formed upright on a head plate.
Fixed scroll and orbiting scroll
Combine both scrolls with their wraps facing inward.
Orbiting scroll wrap by each wrap and end plate
On the outer wall side and the fixed scroll wrap outer wall side respectively
The first and second spaces formed are in the center of the scroll
In both directions so that its volume decreases as it moves
Performs relative movement of the roll and sucks in from the outer circumference of the scroll
Compressed gas provided in the center of the fixed scroll
The compressed gas is discharged from the specified discharge port.
In the discharge stroke, the compressed gas in the first space is:
The outline of the enlarged discharge port enters the first space side
To the discharge port through the enlarged flow path formed by
Scroll type electric compressor configured to flow out
From the second space to balance with the enlarged flow path
Discharge channel increasing means is provided, and said discharge channel increasing means is provided.
Is the minimum formed on the outer wall side of the fixed scroll wrap.
From the tip of the enclosed space to the tip of the orbiting scroll wrap
Within the range of
A recess formed around the thickness of the
The second passage through the flow passage having the increased flow passage cross-sectional area due to the concave portion.
It is configured that the compressed gas in the space flows out to the discharge port
It is characterized by the following. According to the first aspect of the present invention, in the discharge stroke after the end of the compression stroke, the cut portion provided at the tip of the fixed scroll wrap passes through the flow path having the increased flow path cross-sectional area. The flow of compressed gas in the second space lacks balance with that in the first space through a flow path having an increased flow path cross-sectional area formed by a concave portion formed on the inner wall surface side of the tip of the orbiting scroll wrap over the wrap thickness. It is done promptly without anything. An embodiment of the present invention will be described below in detail with reference to FIGS. 6 to 8 show the first embodiment of the present invention, in which the winding start of the fixed scroll wrap 13 is changed to the orbiting scroll wrap 10.
A cut portion formed by notching the leading end of the wrap 13 at the position of the point 109 with a shorter winding start point 33, that is, a larger winding start angle is provided. This cut portion may be cut over the entire height of the wrap, as shown in FIG. 7, or partially cut only at the center portion, leaving the upper and lower portions of the wrap height as shown in FIG. May be. Due to this cut portion, the compression chamber is compressed when the cut point 109 of the fixed scroll wrap and the corresponding point 110 on the inner wall surface of the orbiting scroll come into contact slightly before the formation of the minimum sealed space 32. The process is terminated, and thereafter, communicates with the discharge chamber. Here, the tip 111 of the outer wall surface of the wrap 10 of the orbiting scroll is in contact with the inner wall surface 112 of the wrap 13 of the fixed scroll, and the compression chamber continues to be compressed for a while until the minimum closed space 31 is formed. Will be. The clearance between the cut point 109 at the tip of the fixed scroll wrap and the inner wall surface 36 of the orbiting scroll wrap is gradual, has a large resistance, and is substantially compressed until the minimum sealed space 32 is formed as in the conventional case. Continue. The winding start point 33 of the orbiting scroll wrap
When the gas passes through the minimum sealed space 31, the gas discharge starts through the portion A of the discharge port 101, while the clearance between the cut point 109 of the fixed scroll wrap and the inner wall surface 36 of the orbiting scroll is sufficiently opened. As a result, the cross-sectional area of the discharge passage from the pair of minimum sealed spaces 31 and 32 increases as compared with the related art, and the compressed gas flows to the discharge port 101. That is, the portion A forms the first discharge passage cross-sectional area increasing means for the minimum sealed space 31, and the cut portion at the tip of the fixed scroll wrap is the minimum sealed space 3
2 for forming a second discharge passage cross-sectional area increasing means. According to the above embodiment, a pair of the minimum enclosed spaces 3
Since the cross-sectional area of the discharge passage between the outlets 1 and 32 and the discharge port 101 can be made sufficiently large at the set pressure ratio, the discharge loss can be reduced, and an increase in power consumption due to overcompression can be prevented. The cut of the leading end of the wrap at the start of the fixed scroll wrap winding is shown as a straight line in this embodiment, but may be curved. As described above, also in this embodiment, after completion of compression, a discharge passage having a passage cross-sectional area of a sufficient size is formed between each of the pair of minimum sealed spaces and the discharge port. Thus, an increase in power can be prevented, and a well-balanced and stable operation can be performed. FIG. 9 shows a second embodiment of the present invention, in which the orbiting scroll and the fixed scroll complete the compression stroke, a pair of minimum sealed spaces 31, 32 are formed, and the starting point of winding of both wraps. When the inner wall surface of the orbiting scroll wrap 10 is in contact with the inner wall surface of the other lap at 113 and 114,
In No. 6, a recess 115 having a wrap thickness is provided between the discharge chamber 35 and the vicinity of the point 113. The other end of the concave portion 115 may extend so as to straddle the point 114 as shown in FIG. 10, or may be formed in the concave portion 116 only near the point 114 as shown in FIG. . Further, as shown in FIG. 12, a recess 117 having the same groove depth may be used. The concave portions 115, 116, and 117 in the above-described embodiments increase the cross-sectional area of the discharge flow path with respect to the minimum sealed space 32. Incidentally, as shown in FIG.
It may be provided over the entire area in the height direction of the wrap, or as shown in FIG. 14, it may be provided only in the center portion while leaving the upper and lower ends in the height direction of the wrap. Further, as shown in FIG. 15, a plurality may be provided. The shape of the concave portion may be a straight line as shown in FIG. 14, a combination of a straight line and a curve as shown in FIG. 15, a curved line as shown in FIG. Further, as shown in FIG. 17, the concave portion 121 may form a concave groove formed on the end plate portion 122. Further, in addition to the circular discharge port shape, the shape of the discharge port is simple in machine processing,
When it is formed by casting, pressing, or the like, it is easy to use other than circular shapes such as an ellipse, a square, a square having a rounded angle, a long hole, and the like, and a large passage area can be obtained. Further, in the above embodiment, the case where the discharge port is straight is shown, but the discharge port may be narrowed or enlarged in the middle of the discharge port. Since the present invention has the above-described structure, after the compression stroke is completed, it is possible to immediately connect the pair of minimum sealed spaces and the discharge port with a discharge flow path cross-sectional area larger than before. Pressure loss during the discharge stroke,
This prevents over-compression and enables a well-balanced and stable operation.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a scroll compressor. FIG. 2 is an enlarged view of a wrap around a discharge port of a conventional machine. FIG. 3 is a view showing a state in which a discharge passage is opened at the tip portions of both wraps. FIG. 4 is an enlarged view of a wrap around a discharge port of a prior example. FIG. 5 is a view showing an opening state of a discharge port. FIG. 6 is an enlarged view of a wrap around a discharge hole according to one embodiment of the first invention. FIGS. 7 and 8 are enlarged views showing a cut portion at a distal end portion of a fixed scroll. FIG. 9 is an enlarged view of a wrap around a discharge port according to still another embodiment. FIG. 10 is an enlarged view of a wrap around a discharge port according to an embodiment of the second invention. FIG. 11 is an enlarged view of a wrap around a discharge port according to still another embodiment. FIG. 12 is an enlarged view of a wrap around a discharge port according to still another embodiment. 13, 14, 15, 16 and 17 are lap sectional views of the orbiting scroll according to the embodiment of the present invention. [Description of Signs] 1 ... Closed container 2 ... Scroll compressor 3 ... Motor 4 ... Swirl scroll 5 ... Fixed scroll 6 ... Frame 7 ... Crank shaft 8 ... Swivel mechanism 9 ... End plate 10 ... Lap 11 ... Slewing bearing 12 ... End plate 13 ... Lap 15 ... Suction port 16 ... Discharge port 17 ... Crank section 18 ... Slewing bearing 19 ... Suction pipe 20 ... Discharge pipe 21 ... Upper space 22,23 ... Pathway 24,25 ... Space 26 ... Oil 27 ... Oil supply device 28,29 ... oil holes 30 ... balance weights 31, 32 ... minimum enclosed space 35 ... discharge chambers 36, 37 ... wrap outer wall surface 38 ... discharge passage 100 ... wrap outer wall surface 101 ... enlarged discharge ports 115, 116, 117, 118, 120, 121 ... recess

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Takahiro Tamura               390 Muramatsu, Shimizu-shi, Shizuoka Pref.               Inside the Shimizu Factory (72) Inventor Takao Mizuno               390 Muramatsu, Shimizu-shi, Shizuoka Pref.               Inside the Shimizu Factory (72) Inventor Yoshikatsu Tomita               390 Muramatsu, Shimizu-shi, Shizuoka Pref.               Inside Ritsumeikan Machinery Research Laboratory                (56) References JP-A-56-20701 (JP, A)                 JP-A-55-101788 (JP, A)                 Tokiko Hei 5-41839 (JP, B2)

Claims (1)

(57) [Claims] [1] A fixed scroll and an orbiting scroll formed of a spiral wrap formed upright on a head plate, and both scrolls are combined with the wrap facing inward. The first and second spaces formed on the outer wall surface side of the orbiting scroll wrap and the outer wall surface side of the fixed scroll wrap by the wrap and the end plate decrease the volume of the two scrolls so as to move toward the center of the scroll. Performing a motion, compressing the gas sucked in from the outer peripheral side of the scroll, and discharging the compressed gas from a discharge port provided at the center of the fixed scroll, wherein the compressed gas in the first space is discharged in a discharge stroke. flows out to the discharge port through the enlarged flow path contours of the enlarged discharge port is formed by Yuku enters into the first space side In urchin constructed scroll type electric compressor, the discharge from the second space to balance with the larger flow passage
A flow path increasing means is provided, and the discharge flow path increasing means cuts a cut portion at the tip of the fixed scroll wrap over the entire wrap height or partially cut so that the winding start angle is slightly larger than the orbiting scroll. provided, in the discharge stroke, is configured to compress gas in the second space through the flow path of increased flow path cross-sectional area by said cut portion flows out to the discharge port
Scroll type electric compressor, characterized in that there. [2] A fixed scroll and an orbiting scroll composed of a spiral wrap formed upright on a head plate, and both scrolls are combined with the wrap facing inward, and the outer wall surface of the orbiting scroll wrap is formed by each wrap and the head plate. The first and second spaces formed on the outer side and the outer wall surface of the fixed scroll wrap move relative to each other so as to decrease the volume as the space moves toward the center of the scroll. Compressed gas is discharged as a compressed gas from a discharge port provided at the center of the fixed scroll, and the compressed gas in the first space in the discharge stroke has an enlarged contour of the discharge port. A scroll configured to flow out to the discharge port through an enlarged flow path formed by the line entering the first space side. In the rotary electric compressor , discharge from the second space is performed to balance with the enlarged flow path.
A flow path increasing means is provided, and the discharge flow path increasing means is provided within a range from the vicinity of the front end of the minimum sealed space formed on the outer wall surface side of the fixed scroll wrap to the front end of the orbiting scroll wrap. the recesses formed on the inner wall surface side gouge wrap thickness provided, in the discharge stroke, the compressed gas in the second space through the flow path of increased flow path cross-sectional area by the recess is configured to flow to the discharge port scroll type electric compressor, characterized in that there.