JP2570506B2 - Horizontal scroll compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal scroll compressor having a capacity control mechanism.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view of a conventional horizontal scroll compressor disclosed in, for example, JP-A-63-310328.
In the figure, reference numeral 1 denotes a shell as an airtight container having an oil reservoir 2 at the bottom, which comprises a cylindrical body 3 forming a shell peripheral wall and a lid 4 closing an opening of the cylindrical body 3. A corner portion 5 is provided at a portion where the peripheral wall and the bottom cross each other. A compression mechanism 6 is fitted and fixed in the shell 1. 40 is a discharge port, 7 is a discharge pipe that opens into and out of the shell 1, 8 is a main shaft that is rotated by a motor 9, and is provided inside the shell 1.
Inside, a first oil passage 10 extending in the axial direction and a second oil passage 11 opening in the radial direction are formed. A cylindrical joint 12 is connected to a lower end of the main shaft 8 so as to communicate with the first oil passage 10. Numeral 13 denotes a positive displacement oil pump composed of, for example, a trochoid pump, which is connected to the lower end of the joint 12 and rotatably accommodated in a pump housing 14. The oil pump 13 is configured to forcibly supply oil to each bearing (sliding portion of the compression mechanism 6) via the first oil passage 10 and the second oil passage 11 during operation of the compressor. ing. A pump housing 14 accommodating the oil pump 13 is screwed to a stator 9a of the motor 9 and has a cylindrical U-shape having an insertion hole 16 which is eccentric to the axis of the main shaft 8 and communicates with a tube 15 for oil suction. A first housing 17, a second housing 18 held in the first housing 17 and connected to the pipe body 15, and rotatably supporting the oil pump 13, provided around the second housing 18. Bottomed cylindrical third fixed to the first housing 17
And a housing 19. Among them, the second housing 18 is provided with a hemispherical projection 20 which is in contact with the eccentric surface of the first housing 17.
A spring 21 for generating a thrust force is elastically mounted between the second housing 19 and the third housing 19. Here, for example,
When the capacity control mechanism of the scroll compressor disclosed in JP-A-63-134894 is adopted for a horizontal scroll compressor,
As shown in FIG. Reference numeral 22 denotes a fixed scroll, 22a is a base plate portion of the fixed scroll 22, and a discharge port (not shown) is provided at the center thereof. 42 is an orbiting scroll, 23 is a compression chamber, 43 is a fixed scroll 22 and an orbiting scroll 42
Therefore, the suction chamber formed on the outer periphery, 24 is a fixed scroll
22, a fluid bypass hole provided in the base plate portion 22a; 25, a valve seat also provided in the base plate portion 22a; 26 , a discharge hole connected to the suction space in the shell 1 ; Bypass valve, 28 is a valve seat
A cover closing the upper part of 25, 29 is a spring holding the bypass valve 27, 30 is a valve seat space formed by the valve seat 25 and the cover 28, 31 is a communication hole provided in the valve seat space 30 of the cover 28,
Reference numeral 32 denotes a pipe for guiding the discharge pressure, which is fixed to a pipe hole (not shown) of the shell 1 of the communication hole 31 of the bypass valve 27 by brazing. 33 is an annular groove provided in the cover 28,
A ring 34 is mounted and sealed with the base plate portion 22a of the fixed scroll 22. Reference numeral 35 denotes a bolt that cantileverly fixes the cover 28 to the base plate portion 22a.

Next, the operation will be described. After the fluid sucked into the shell 1 is gradually compressed by the compression mechanism 6, the fluid is discharged from the discharge pipe 7 to the outside of the shell 1. At this time, when the horizontal scroll compressor having the capacity control mechanism is operated at the maximum capacity without capacity control, by guiding the discharge pressure to the pipe 32, the pressure of the valve seat space 30 becomes the discharge pressure,
The discharge pressure acts on the bypass valve 27, and the bypass valve 27 is pushed down against the spring force of the spring 29, and comes into contact with the valve seat 25. Therefore, the fluid bypass hole 24 and the discharge hole 26 are closed, and the fluid of the compressor 23 is discharged out of the compressor via the discharge port 40 and the discharge pipe 7.

When the compressor is operated by controlling the displacement, it is necessary to open the bypass valve 27. However, since the discharge pressure is applied to the valve seat space, the bypass valve 27 cannot be operated only by the spring 29. Instead of being pushed upward, the suction pressure is guided to the pipe 32, whereby the bypass valve 27 is easily pushed up by the spring 29. Then, by guiding the suction pressure from a suction mechanism (not shown) to the pipe 32, the pressure in the valve seat space 30 becomes the suction pressure, and the suction pressure acts on the bypass valve 27. And is held up by the cover 28. Thereby, the fluid bypass hole 24 and the discharge hole 26 communicate with each other, and a part of the fluid in the compression chamber 23 is
The fixed scroll 22 communicates with the suction space through the discharge hole 26.
It is discharged outside, and the compression capacity in the compression chamber 23 is controlled.

[0005]

Since the conventional horizontal scroll compressor having the capacity control mechanism is configured as described above, the fluid that is bypassed during the capacity control operation is:
As shown by the arrows in FIG. 5, the lubricating oil in the oil reservoir Me to directly impinge Me oil reservoir through the discharge hole, stirred up into the shell, the oil is sucked into the compression chamber with fluid, the shell From the oil to the circuit of the refrigeration system, etc., and the amount of oil released increases, leading to a decrease in the oil level in the shell. Was.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. By suppressing the rise of oil in the shell of a compressor, the amount of oil taken out of the shell is reduced, and the oil is depleted. It is an object of the present invention to provide a horizontal scroll compressor which can prevent the occurrence of seizure of a sliding portion or the like, and can surely improve the reliability in using the compressor.

[0007]

Horizontal scroll compressor according to claim 1 SUMMARY OF THE INVENTION are those provided with means for shielding the fluid from the discharge hole to directly impinge Me oil reservoir.

Further, as described in claim 2, a passage may be provided in which the discharge hole is made to penetrate through the base plate portion to reach between the spiral projections and discharge the fluid to the suction portion of the compression chamber.

[0009] Alternatively, providing a guide means for discharging the fluid to above the liquid surface of the Me oil reservoir to the discharge hole as described in claim 3.

[0010]

The horizontal scroll compressor according to the present invention is provided with a shielding means for preventing the fluid from the discharge hole from directly colliding with the oil retainer as described in claims 1 to 3, thereby suppressing the oil from rising. It is possible to reduce the amount of oil taken out from the inside and prevent the occurrence of seizure or the like of the sliding portion.

[0011]

[Embodiment 1] FIG. 1 is a sectional view showing one embodiment of the present invention. 1 to
Reference numeral 43 is exactly the same as the conventional horizontal scroll compressor. FIG. 2 is an enlarged sectional view of a main part of the first embodiment. The discharge hole 26 provided in the base plate portion 22 a of the fixed scroll 22 is connected to the suction chamber 43.

Next, the operation will be described. When the compressor is operated by controlling the capacity, the bypassed fluid is discharged into the suction chamber 43 through the discharge hole 26 and sucked again as shown by the arrow in FIG. Thereby, the compression volume in the compression chamber 23 is controlled, fluid discharged this time through the discharge hole 26 is because it is not discharged to the fixed scroll 22 outside to shield from colliding directly with the oil reservoir Me 2 it can, lubricating oil in the oil reservoir Me 2 is not Maiagara into the shell 1, it is possible to reduce the carrying out of the oil from the shell.

Embodiment 2 FIG. FIG. 3 shows another embodiment of the means for shielding the fluid from the discharge hole from directly colliding with the oil sump, in which the fixed scroll 22 is viewed from the opposite side of the compression chamber 23 and the suction space is shown. A pipe 44 with a 90 ° angle to the discharge hole 26 leading to the discharge hole
The other end of the cylindrical port connected to the discharge hole 26 of the pipe 44 is directed vertically above the central axis of the discharge hole 26. As a result, during the capacity control operation of the compressor,
Bypassed fluid from it, is exhausted to vertically above the central axis of the discharge hole 26, resulting in Me oil reservoir, can be shielded from colliding directly, the same effects as in Example 1 Can be

[0014] In the embodiment in further Examples 2, it has been described that connects the pipe 44 with a 90 degree angle to the discharge hole 26, to another, such bypass fluid angle of the pipe 44 is not blown directly oil level By doing so, a similar effect can be expected.

[0015]

As is evident from the foregoing description, according to the present invention, since the fluid from the discharge holes provided with means for shielding from colliding directly Me oil reservoir, the oil from the shell pressing the soaring of oil It is possible to reduce carry-out, prevent the occurrence of seizure of the sliding portion due to oil depletion, and to reliably improve the reliability in using the compressor.

[Brief description of the drawings]

FIG. 1 is a sectional view showing Embodiment 1 of the present invention.

FIG. 2 is an enlarged sectional view showing a main part of the first embodiment of the present invention.

FIG. 3 is a view showing a fixed scroll according to a second embodiment of the present invention as viewed from a side opposite to a compression chamber.

FIG. 4 is a sectional view showing a conventional horizontal scroll compressor.

FIG. 5 is an enlarged sectional view of a main part of a conventional horizontal scroll compressor in the case where a capacity control mechanism is provided.

[Explanation of symbols]

1 shell, 2 oil reservoir Me, 22 fixed scroll 22
a base plate part, 40 discharge part, 23 compression chamber, 24 fluid bypass hole, 26 discharge hole, 27 bypass valve, 42
Oscillating scroll, 43 suction chamber, 44 piping.

Claims (3)

(57) [Claims] 1. A have Me oil reservoir at its bottom, a cylindrical shell having a central axis extending in the horizontal direction, the base plate portion disposed in the vertical direction of the shell as the diameter direction within the shell And a fixed scroll having a spiral projection provided on the rear surface of the base plate portion and a discharge port provided at the center, and a spiral plate and a base plate portion provided at the rear portion of the spiral projection. An orbiting scroll which is combined to form a compression chamber, a bypass hole provided on the base plate portion of the fixed scroll and capable of bypassing a part of the compressed fluid from a portion before communicating with the discharge port of the compression chamber; A valve for opening and closing the bypass hole, and the fixed switch facing the oil reservoir for discharging the fluid from the bypass hole to a portion having a lower pressure than the portion .
In horizontal type scroll compressor provided with a discharge hole extending radially of crawling and the orbiting scroll, characterized in that the fluid from the discharge hole is provided with a shielding means for preventing the direct collision to Me the oil reservoir Horizontal scroll compressor. 2. The horizontal scroll compressor according to claim 1, wherein the discharge hole extends through the base plate portion of the fixed scroll and faces between the spiral projections. 3. The horizontal scroll compressor according to claim 1, wherein the discharge hole is provided with guide means for discharging the fluid above the level of the oil reservoir.