JPS58172482A - scroll compressor - Google Patents

Abstract

PURPOSE:To prevent a turning scroll from excessively rotating in the reverse direction at stopping of operation, by providing a check valve to a delivery hole part provided to a fixed scroll and always communicating the delivery side of said valve to a compression chamber through a fine passage. CONSTITUTION:A scroll compressor operates such that a main shaft 4 fitted to a rotor 7b of a motor 7 is rotated to relatively rotate a turning scroll 2 for a fixed scroll 1, and working gas sucked to a suction chamber 5c from a suction pipe 10 is compressed, then high pressure gas is discharged to a delivery chamber 16 through a compression chamber 5d and delivery hole 1d and then delivered from a delivery pipe 11 via a passage 18. Here a check valve 25 of reed valve type is provided to the hole 1d, and a fine passage (fine hole) 26 always communicating the chamber 16 to the chamber 5d is formed to a valve body 25a of the valve 25. In this way, a suitable amount of fluid in a refrigerating cycle high pressure side reversely flows to a low pressure side at stopping of operation to prevent the scroll 2 from excessively rotating in the reverse direction.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a scroll compressor used in a refrigeration cycle that increases the pressure of refrigerant gas.

A conventional scroll compressor of this type will be explained with reference to FIG. 1 and FIG. 3. That is, a fixed scroll 1 is fixed to a frame 3 fixed to an inner wall of an airtight container 6 and has a spiral wrap 1b and a discharge hole 1d provided upright on the mirror surface of an end plate 1a, and a fixed scroll 1 that engages with the lug 1b, and It has a spiral lug 2b provided upright on one surface of the end plate 2a, and is attached via a bearing 12 to the tip of the main shaft 4, which is rotatably supported by a bearing 13 attached to a 7v-mu 3. an orbiting scroll 2, an Oldham mechanism 9 interposed between the back surface of the orbiting scroll 2 and the seven arms 3;
It has a structure in which the motor 1 attached to the main shaft 4 is housed in an airtight container 6, and the orbiting scroll 2 is rotated without rotating through the main shaft 4 and the Oldham mechanism 9, and both scrolls 1.2 are Compression chambers 5a, 5 formed by Q
The fluid is compressed by increasing or decreasing the volume of b.

In the conventional scroll compressor as described above, due to the fluid pressure in the compression chambers 5a and 5b, both scrolls 1.2
A force is generated that tends to separate the two from each other in the axial direction. In order to counter this force and bring both scrolls 1.2 into close contact with each other,
A frame 3 that supports the F plane of the orbiting scroll 2 and the main shaft 4
A back pressure chamber 14 having an intermediate pressure between the suction pressure and the discharge pressure.
The sealing with one suction side is performed by the outer broken part of the end plate 2a of the orbiting scroll 2 and the fixed scroll 1^, and the sealing with the other discharge side is achieved by having the bearing 13 serve both the bearing function and the shaft part function. I'm doing a lot of things.

I When such a scroll compressor is applied to a refrigeration cycle, when the compressor stops, the high pressure A fluid acts on the discharge part of the compressor, so there is a risk that the compressor will reverse rotation. In order to prevent this, if a check valve is provided at the discharge part,
Due to the differential pressure between the pressure on the high pressure side and the pressure in the back pressure chamber, oil on the high pressure side leaks into the back pressure chamber from a small gap in the bearing, and lubricating oil further leaks to the low pressure side from the gap in the outer line of the orbiting scroll. Therefore, the lubricating oil level becomes low. This frequent restart may lead to insufficient lubrication, which may cause seizure of sliding parts such as bearings.

The present invention aims to eliminate the above-mentioned drawbacks and improve reliability.The present invention is aimed at solving the above-mentioned drawbacks and improving reliability. It is characterized in that it is configured to constantly communicate with the compression chamber formed by the orbiting scroll via a micro passage.

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

In Figures 1 to 3, 6 is on top! 6a.

It is an airtight container consisting of a container body 6b and a lower lid 6C to which a suction pipe 10 and a discharge pipe 11 are attached.Inside this airtight container 6 are the fixed scroll 1, the orbiting scroll 2, the Oldham mechanism 9, and the rotor that drives the main shaft 4. A motor 7 consisting of a stator 7b and a stator 1a is housed. The back pressure chamber 14 provided on the back surface of the orbiting scroll 2 is connected to the end plate Zat frame 3 of the orbiting scroll 2, the main shaft 4, and the bearing 1.
2.13, and communicates with the compression chamber 5a + 5b formed by both lugs 1b and 2b via a small hole 2d provided in the mirror plate 2a. Therefore, the pressure in the back pressure chamber 14 can be maintained at an intermediate pressure between the suction pressure and the discharge pressure, and the axial pressing force necessary to bring the orbiting scroll 2 into close contact with the fixed scroll 1 can be obtained.

A discharge hole 1d provided in the center of the fixed scroll 1 is provided with a check valve 25 consisting of a valve body 25a and a valve body retainer 25b. The valve body 25a is provided with a micro passage (pore) 26 that constantly communicates the discharge chamber 16 formed in the upper part of the closed chamber A6 with the compression chambers 5a and 5b.

Next, the operation of this embodiment having the above configuration will be explained.

Is the working waste the suction pipe 101? and from the suction hole IC to the suction chamber 5
C, the gas is compressed by the orbiting scroll 2 that rotates as the main shaft 4 rotates, and becomes a high-temperature, high-pressure gas. This high-temperature, high-pressure gas is discharged to the discharge chamber 16 through the compression chamber 5d and the discharge hole 1d, and then sent to the motor chamber 17 through the passage 18K, where it circulates around the motor 1, and then passes through the discharge pipe 11 to a predetermined location. sent to the department.

The lubricating oil 20 collected at the bottom of the airtight container 6 is discharged into the discharge chamber 16.
Due to the differential pressure between the main shaft 4 and the back pressure chamber 14, oil is supplied to the bearings 13, 19 of the main shaft 4 and the bearings 12 of the orbiting scroll 2 through an oil passage 24 provided inside the main shaft 4. When the oil is replaced, the lubricating oil 20 is supplied to the slit 21.22 of the bearing 12.13 through the oil passage 24, lubricates the bearing 12.13, and then discharged into the back pressure chamber 1.

The lubricating oil discharged into the back pressure chamber 14 is stirred by the balance weight 15 of the back pressure chamber 14 and becomes a mist, and the mist of DLLF oil passes through the passage 2d provided in the star scroll 2 plate 23 once. Via 1: EiII room 5a
, 5b, and the moth is eventually compressed together with the refrigerant force.
1ii5d, the discharge hole 1d and the check valve 25 are sent out into the closed chamber a6 and stored at the bottom of the chamber.

During operation, the valve body 25Ji of the check valve 25 is pushed up by the high-pressure working fluid discharged from the compression chamber 5d, and the compression chamber 5d is communicated with the discharge chamber 16 in the closed container 6.

When the valve body 25a is stopped, the valve body 25a is in close contact with the valve seat 27 attached to the scroll 1, so that the high-pressure gas is directly compressed m5dK, and II! It is possible to prevent the rotating star scroll from rotating twice. I wanted to-C@The pressure inside the closed container 6 is maintained at high pressure, but the compression chamber 5d and the back pressure chamber 14
becomes a low-pressure side pressure due to the gap between the suction chamber 5C and the back pressure chamber 14 between the lines in the compression chamber 5d and the outer edge of the orbiting scroll 2.111 If this frequently stopped state is maintained for a long period of time, Due to the differential pressure between the high pressure side and the low pressure side, the lubricating oil 2 at the bottom of the vlI closed container 6
0 is the oil passage 2 of the main shaft 4 and the slit 21 of the bearing part.
Back pressure 114Kfi people through 23, and further back pressure chamber 14
Since the lubricating oil flows out through the suction hole IC and suction flo on the lower pressure side, the lubricating oil level in the lower part of the closed container 6 becomes low. In this case, the valve body 25a of the check valve 25 is provided with a pore 26 that communicates the compression chamber 5d and the discharge chamber 16. Control the flow rate back to °C.

When the valve body 25a is closed, the fluid in the discharge chamber 16 on the high-pressure side flows back through the compression chamber 5d to the low-pressure side through the small hole 26, but since it is throttled when flowing through the small hole 26, the flow rate is Therefore, excessive reversal of the orbiting scroll 2 can be prevented.

In the refrigeration cycle, the fluid on the high-pressure side flows back through the pores 26 and the compression chamber 5 to the low-pressure side, thereby making it possible to quickly balance the pressure of the refrigeration cycle with VC. Further, due to the pressure difference between the high pressure side and the low pressure side, the lubricating oil 20 accumulated at the bottom of the closed container 6 can be prevented from flowing out to the low pressure side via the oil passage 24 of the main shaft 4. Even higher pressure 114
By setting the reverse flow rate of gas from the power source to the lower side by the size of the pore 26 provided in the valve body 2ja, it is possible to The time it takes for the pressure to balance is t-IJIm.

Other embodiments shown in FIGS. 5 and 6 have a valve body 25
a! The fixed scroll IKa and the nine valve seat portions 27 are provided with lAl112B radially.

With this configuration, when the valve body 25a is closed, the thin #28
The tip opens into the discharge chamber (not shown), and the other end opens into the discharge hole 1d, forming a micro passageway that communicates the discharge chamber and the compression chamber (not shown). Fluid can flow back to the low pressure side. The thin #128 is provided arbitrarily, and its arrangement is not limited to radial, but can be arbitrarily selected such as parallel. Said 11iI428
It is possible to appropriately set the amount of backflow from the high-pressure side to the low-pressure side depending on the speed and number of steps.

In still another embodiment shown in FIG. 47, the width d of the valve body 25M is smaller than the diameter of the valve seat 2I (d<D), so that when the valve body 25a is closed, the width d of the valve body 25M is smaller than the diameter of the valve seat 2I. View ζko,
It is cut so as to form a minute gap (minute passage 4) 2''Ja, 29b.

As explained above, the present invention prevents the orbiting scroll from rotating excessively in reverse by causing the fluid on the high-pressure side of the refrigerated Nicle to flow backwards to the low-pressure side when one rotation is stopped. Can not. In addition, the high-pressure side and low-pressure side can be quickly balanced, and the differential pressure between the high-pressure side and the low-pressure side allows lubricating oil accumulated at the bottom of the sealing device to flow out to the low-pressure side (14). Since this can be prevented, the reliability of the scroll pressure machine can be improved.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an embodiment of the scroll compressor of the present invention, Fig. 2 is a sectional view taken along the line X-X in Fig. 1, and Fig. 3 shows details of the bearing section in Fig. 1. Cross-sectional view, Figure 4 (a
) (b) is a sectional view showing one embodiment of the reverse valve part and a plan view of the valve body, FIG. 3(a), FIG. 6(a), and the seventh factor (
a), FIG. 5(b), FIG. 6), and FIG. 1 fb) are a cross-sectional view and an fm diagram of a four-valve body, respectively, showing an embodiment of the check valve. 1...Fixed scroll 1d...Discharge hole 2.
・・Orbiting scroll 5a + 5b + 5d・・
・Compression chamber 9...Oldham machine end 25...Check valve
2aa... Valve body 26.28.29a, 29b
...Fine/'Ku passage 27... Benza, - Representative i Patent attorney ± 4 days Lii, '#+> to 1m 1b / 148th figure zA z5゜d Liao 5bm

Claims (1)

[Claims] 1.! , a scroll pressure # consisting of a fixed scroll and an orbiting scroll in which spiral wraps are provided upright on the II plate and both wraps are engaged with each other, and an Oldham mechanism for preventing rotation of the orbiting scroll.
In the machine, a check valve is provided in a discharge hole provided in the E constant scroll, and the discharge side of the check valve and the compression chamber formed by both scrolls are constantly communicated via a micro passage. A scroll compressor characterized by the following configuration. 2. A scroll compressor according to claim at, wherein the micro passage is formed by providing a pore in a valve body of a check valve. 3. A scroll compressor according to claim 1, characterized in that the minute passage is formed by providing an ins in a valve seat portion opposite to a valve body of a check valve. 4. The scroll compressor according to claim 1, characterized in that the minute passage is formed by forming a minute gap between the valve body and the valve seat when the reverse valve is closed. scroll compressor.