JPH0541839B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electric compressor having a scroll compression mechanism.

[Prior Art] Fig. 1 shows the structure of a conventional scroll compressor.

A scroll compression mechanism 2 and a motor 3 are built into the closed 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 an end plate 9, and has an orbiting bearing 18 on the back surface of the end plate into which the rotating mechanism 8 and the crank portion 17 of the crankshaft 7 are inserted.

The fixed scroll 5 has a spiral wrap 13 standing upright on an end plate 12, and has an inlet 15 on the outer periphery.
However, discharge ports 16 are provided at the center of the end plate.

The orbiting scroll 4 and the fixed scroll 5 are combined with each other with their laps facing inside, and the fixed scroll 5 and the frame 6 are fastened together.

The crankshaft 7 is supported by the frame 6, the motor 3 is installed on one side of the crankshaft 7, and the crank portion 17 is inserted into an orbiting bearing 18 of the orbiting scroll 4.

The suction port 15 of the fixed scroll 5 is connected to the airtight container 1
The sealed container 1 is further provided with a discharge pipe 20 . Therefore, when the crankshaft 7 rotates due to the rotation of the motor 3,
The orbiting scroll 4 performs an orbiting motion relative to the fixed scroll 5 while maintaining its posture by the action of the orbiting mechanism 8.

With the above configuration, the spaces formed by the respective end plates 9 and 12 of the orbiting scroll 4 and the fixed scroll 5 and the respective wraps 10 and 13 form a symmetrical pair of closed spaces, and the spaces between the pair of closed spaces are symmetrical. As it moves toward the center of the scroll, its volume decreases, compresses the gas sucked in through the suction port 15, and discharges it from the discharge port 16. The discharged gas flows from the upper space 21 in the closed container 1 through the passages 22 and 23 into the spaces 24 and 25, 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. In addition, 28 and 29 are oil holes, and 30
is the balance weight.

Here, as shown in FIG. 2, the discharge port 16 provided in the end plate 12 of the fixed scroll 5 is located at a position where the orbiting through roll 4 and the fixed scroll 5 form a pair of minimum sealed spaces 31, 32, that is, each lap. Point 3 corresponding to each winding start angle of 10 and 13
3, 34, respectively corresponding laps 13, 1
It opens into the discharge chamber 35 that is formed when it is in contact with the inner wall surfaces 37 and 36 of the orbiting scroll 4 and is substantially close to the inner wall surface 36 of the wrap 10 of the orbiting scroll 4 and the inner wall surface 37 of the wrap 13 of the fixed scroll 5, respectively. It is installed in the position shown below.

As the orbiting scroll 4 continues to rotate,
As shown in Figure 3, the wrap starting point 33,3
4 are the inner wall surfaces 37 of the scrolls facing each other,
36, a pair of discharge channels 38, 38 are formed apart from the pair of first and second minimum sealed spaces 3.
The gas in the gases 1 and 32 flows into the discharge chamber 35 and is discharged from the discharge chamber 35 into the upper space 21 through the discharge port 16.

FIGS. 4 and 5 show a prior example by the present inventors that has an enlarged discharge port compared to the conventional scroll compressor shown in FIG. 2. The enlarged outlet 101 in this prior example is also disclosed, for example, in US Pat. No. 3,874,827. In addition,
The overall structure of the compressor in this prior example is the same as the conventional one, so a description thereof will be omitted. Also, the same reference numerals as in the past indicate the same parts as in the past, and they perform the same functions. At the end of the compression stroke, each wrap 10, 13 contacts the end plate of the fixed scroll at the winding start point 33, 34, and the minimum sealed space 31, 32 is created.
An enlarged discharge port 101 is provided at a position where the inner wall surface 37 of the fixed scroll wrap and the outer wall surface 100 of the orbiting scroll wrap are substantially close to each other.

When the orbiting scroll rotates further, the winding start points 33 and 34 of the wraps are separated from the inner wall surfaces 37 and 36 of the wraps facing each other, and discharge channels 102 and 103 similar to the conventional one are formed, and a pair of minimum sealed spaces 31 are formed. , 32 flows to the discharge port 101 via the discharge chamber 35.

By the way, the discharge port 101 is similar to the discharge port 1 in FIG.
6, the wrap outer wall surface 100 of the orbiting scroll moves across the contour line of the discharge port 101, and the minimum sealed space 31 directly communicates with the portion A of the discharge port 101. By doing so, the cross-sectional area of the discharge flow path between the discharge port 101 and the minimum sealed space 31 increases by the area of the above-mentioned portion A, and the discharge speed becomes faster by that amount. Cross-sectional area can be secured. Furthermore, the area of the discharge port 101 itself can also be increased.

[Problem to be Solved by the Invention] In the conventional scroll compressor shown in FIG. 2, the compressed gas discharge port 1 in the first and second minimum sealed spaces after the start of the discharge stroke
6 is carried out in a well-balanced manner, but the moving speed of the wrap starting points 33 and 34 is slow, and it takes time for the discharge passages 38 and 38 to form a sufficiently large cross-sectional area. This has disadvantages in that the flow path loss is large, the pressure within the pair of minimum sealed spaces 31 and 32 rises, resulting in an overcompression state, and power consumption increases.

In addition, in the scroll compressor of the prior example shown in FIG. 2, the minimum sealed space 32 is the same as the conventional one,
This results in a state of overcompression, resulting in 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, and its purpose is to 1st
and a second minimum sealed space 31, 32 defines the discharge flow path 38, 38, 10 at each wrap tip.
In addition to No. 2,103, by forming a discharge flow path that increases the cross-sectional area of each space and communicating with the enlarged outlet through the discharge flow path, the discharge loss can be reduced. In addition to reducing the above-mentioned overcompression and enabling well-balanced and stable operation, it not only eliminates the drawbacks of the conventional passage loss and overcompression described above, but also the above-mentioned It is an object of the present invention to provide a scroll type electric compressor which also solves the problem of lack of balance in the previous example.

[Means for Solving the Problems] In order to achieve the above object, a scroll type electric compressor according to the present invention has a fixed scroll and an orbiting scroll consisting of a spiral lap formed upright on an end plate, and both scrolls are combined with the wraps facing inward, and a pair of first and second spaces are respectively formed on the outer wall side of the orbiting scroll wrap and the outer wall side of the fixed scroll wrap by each wrap and end plate. a compression stroke in which the gas in the space is compressed by relative movement of both scrolls so that the scroll moves toward the center of the scroll and thus reduces its volume; and a discharge stroke for discharging the gas compressed in the compression stroke from an enlarged discharge port that penetrates, and in the discharge stroke, the compressed gas in the first space is In a scroll type electric compressor configured to flow out to the enlarged discharge port through a flow path formed by entering the first space side, the enlarged discharge port and A concave groove portion whose contour line is approximately the same shape is provided, and during the discharge stroke, the contour line of the concave groove portion enters the second space, thereby compressing the inside of the second space through a flow path formed. The present invention is characterized in that the gas is configured to flow out to the enlarged discharge port.

[Function] In the present invention, in the discharge stroke after the compression stroke, in addition to the flow path formed at the tip of each wrap, an expanded discharge is formed from the first space on the outer wall side of the orbiting scroll wrap. As the outline of the outlet enters into the first space, the outline of the groove from the second space on the outer wall side of the fixed scroll wrap also enters into the second space. As a result, the cross-sectional area of the discharge flow path is increased, and the compressed gas can be discharged quickly without losing balance.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 6 to 9.

6 to 8 show an embodiment of the present invention, in which a discharge port 101 and a scroll wrap 1 are shown.
0 and 13 is the same as that shown in FIG. 4, but in the embodiment shown in FIG. A pair of minimum enclosed spaces 31, 3
2, the orbiting scroll end plate 1 is placed so that it is almost in contact with the wrap outer wall surface 104 of the fixed scroll.
An enlarged circular concave groove 105 whose cross-sectional shape is approximately the same as that of the discharge port 101 is provided on the 06 side, and during the discharge stroke, the compressed gas flows out from the minimum sealed space 32 to the protrusion port 101 through the B portion of the concave groove 105. It turns out. That is, the above part A increases the cross-sectional area of the discharge flow path with respect to the minimum sealed space 31,
The above-mentioned portion B increases the cross-sectional area of the discharge flow path with respect to the minimum sealed space 32 to approximately the same extent as the minimum sealed space 32.

With this structure, when moving from the minimum sealed space 32 to the discharge stroke, as shown in FIGS. 7 and 8,
From the pair of minimum sealed spaces 31 and 32, from the outer wall side of the orbiting scroll wrap, A of the discharge port 101 can be seen.
It is possible to directly discharge the liquid into the discharge chamber 35 through the outer wall surface of the fixed scroll wrap and through the B section of the groove 105, respectively.

FIG. 8 shows a cross section of the concave groove 105 and the discharge port 101, and the minimum sealed space 32 on the outer wall surface of the fixed scroll wrap is B of the concave groove 105 on the orbiting scroll side on the outer wall surface of the tip of the fixed scroll wrap. The minimum sealed space 31 on the outer wall surface of the orbiting scroll is discharged through the A section of the discharge port 101 on the outer wall surface at the tip of the orbiting scroll lap.

The shape of the discharge port 101 and the concave groove portion 105 is not limited to a circular shape, and as in the embodiment shown in FIG. Groove 1
It can also be formed in 08.

According to the above embodiment, when the fluid in the pair of minimum sealed spaces is discharged, the cross-sectional area of the gas discharge passage is increased, so that the gas can be discharged with less resistance, preventing overcompression and reducing the power. It is possible, and
Balanced and stable operation is possible even at a predetermined set pressure ratio.

[Effects of the Invention] Since the present invention is configured as described above, after the completion of the compression stroke, the pair of minimum sealed spaces and the discharge port can be immediately communicated with each other with a discharge passage cross-sectional area larger than that of the conventional one. Therefore, pressure loss during the discharge stroke can be reduced, overcompression can be prevented, and stable, well-balanced operation is possible even at a predetermined set pressure ratio.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the scroll compressor, Figure 2 is an enlarged view of the lap near the discharge port of a conventional machine, Figure 3 is a diagram of the opening of the discharge passage at the tips of both laps, and Figure 4
The figure is an enlarged view of the lap near the discharge port of the previous example, FIG. 5 is a diagram of the discharge port opening state, FIG. 6 is an enlarged view of the lap near the discharge port of an embodiment of the present invention, and FIG. 7 is the discharge passage opening state. 8 is a sectional view of FIG. 7, and FIG. 9 is an enlarged view of the vicinity of the discharge port similar to FIG. 6, showing another embodiment. 1... Airtight container, 2... Scroll compressor, 3
... Motor, 4 ... Orbiting scroll, 5 ... Fixed scroll, 6 ... Frame, 7 ... Crankshaft, 8 ... Turning mechanism, 9 ... End plate, 10 ... Wrap, 11 ... Swivel bearing, 12 ...Mirror plate, 13...
Rap, 15...Intake port, 16...Discharge port, 17
... Crank part, 18 ... Swivel bearing, 19 ... Suction pipe, 20 ... Discharge pipe, 21 ... Upper space, 2
2, 23... passage, 24, 25... space, 26...
...Oil, 27...Oil supply device, 28, 29...Oil hole,
30... Balance weight, 31, 32... Minimum sealed space, 35... Discharge chamber, 36, 37... Wrap inner wall surface, 38... Discharge channel, 100... Wrap outer wall surface, 101... Enlarged discharge port, 102,
103...Discharge flow path, 105...Concave groove portion, 107
...Enlarged deformed discharge port.

Claims (1)

[Claims] 1. It has a fixed scroll and an orbiting scroll consisting of spiral wraps formed upright on an end plate, and both scrolls are combined with each other with the wraps facing inward, and each wrap and end plate have a fixed scroll and an orbiting scroll. A pair of first and second spaces formed respectively on the outer wall side of the orbiting scroll wrap and the outer wall side of the fixed scroll wrap decrease in volume as they move toward the center of the scroll. A compression stroke in which the gas in the space is compressed by relative movement of the scroll, and a discharge stroke in which the gas compressed in the compression stroke is discharged from an enlarged discharge port passing through the center of the fixed scroll. In the discharge stroke, the compressed gas in the first space passes through the flow path formed by the outline of the enlarged discharge port entering the first space. In a scroll type electric compressor configured to flow out to an enlarged discharge port, a concave groove portion having a contour line substantially the same as that of the enlarged discharge port is provided in a central portion inside the orbiting scroll end plate;
During the discharge stroke, the compressed gas in the second space flows out to the enlarged discharge port through a flow path formed by the contour line of the concave groove entering the second space. A scroll type electric compressor characterized by: