JPH0357894A - Oil injection device for scroll compressor - Google Patents

Abstract

PURPOSE:To improve reliability through the restraint of the vibration of a piping system connecting to an oil injection hole, by opening at the lower part of a space the inlet and outlet of the buffer space provided at an injection piping system connecting to the injection hole. CONSTITUTION:When a compressor is driven, supply oil through an oil injection pipe is injected into a compression chamber 8 through an oil injection hole 15, and is mixed with operation gas, and is discharged into the upper part space 1a through a discharge hole 9 as the oil together with the operation gas becomes of high temperature and of high pressure. Next, this mixture comes to a space 1b around a motor via passages 12a, 12b, and the operation gas and the oil are separated, and the oil falls into the lower part of a sealed container 1 and is stored. Hereupon, the pulsation of pressure is generated within the hole 15, and this pulsation is conveyed through an oil injection pipe 14a to oil 16a within a buffer space 20, but as operation gas 21 occupying the upper part space of the space 20 has the property of compression, it acts on so that the pulsation of pressure may be restrained. Accordingly, the pulsation of pressure within an oil injection pipe 14b connecting to a space inlet 22, is restrained, and the vibration of a piping system can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an oil injection device for a scroll compressor used for cooling working gas.

[Conventional technology]

In order to cool the working gas of the scroll compressor 11IO and the compressor main body D, high-pressure oil is supplied through an oil cooler as described in, for example, Utility Model Application No. 1485 6-8 5 0 8 7 as described in Utility Model Application No. 1485 6-8 5 0 8 7. A so-called oil injection method is known in which a working gas is injected from an oil injection hole provided in a fixed scroll D end plate.

[Problem to be solved by the invention]

Regarding the above-mentioned prior art, if the hole diameter of the oil injection hole is smaller than the tooth thickness of the orbiting scroll wrap part O which is in contact with the opening of the hole D, the oil injection hole is Because the oil in the oil injection hole is blocked by the tip of the lap teeth, vibratory pressure pulsations similar to an oil hammer phenomenon occur in the oil in the oil injection hole. Furthermore, when the amount of oil in the injector is large, the vibration of this pressure pulsation accumulates and becomes large, causing a problem in which the vibration of the piping system connected to the oil injection hole becomes large, impairing the reliability of the product. .

SUMMARY OF THE INVENTION An object of the present invention is to provide an oil injector* structure that suppresses vibrations in a piping system connected to an oil injector orifice and has excellent reliability.

[Means D to solve the problem]

In order to achieve the above object, the present invention provides a buffer space in the piping system connected to the oil injector hole, so that the working gas is accumulated in the upper part of the buffer space, and the working gas is compressed. The pressure pulsation in the piping system connected to the oil injection hole is reduced by utilizing the characteristics of the oil injection hole.

In addition, in order to secure a constant volume of the gas in the buffer space circle and stabilize the effect of reducing pressure pulsation, the guaiaphragm divides the buffer space into two spaces, one of which is compressible. Gas is sealed in the space D, and the inlet and outlet of the Babuf 1 space are opened in the other space D.

[Effect]

Since the working gas accumulated in the upper part of the buffer space is compressible, it acts to reduce pressure pulsations generated in the oil injection hole and transmitted to the buffer space.

Piping system D thereby connecting to the oil injection hole
It is possible to reduce absenteeism.

[Example]

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

FIG. 1 shows an embodiment of the present invention D, in which a bar space 17 is provided in the middle of the oil injection f outside the compressed rock.

The closed container IPI'3 houses a vertical type D electric compressor with a scroll compressor section 2 connected to the upper part and a columnar rocker section 3 connected to the lower part. The compressor section includes both scroll members, a fixed scroll 5 and an orbiting scroll 60 forming compression elements, a rotation prevention member 6b of the orbiting scroll 6, a main shaft 7 having a crankshaft 7a that engages with the orbiting scroll 6, and the main shaft. 7, that is, a bearing 6a of the orbiting scroll 6, a main bearing 4a formed in the frame 4, an auxiliary bearing 4b at the lower part of the frame 4, and the like. In this hermetic type scroll compressor, 1 yen of hermetic container has a discharge pressure (high pressure side pressure) P
This is an embodiment of the high-pressure Teyamba method in the atmosphere of d. Further, the shape of the scroll wrap is an involute or a curve similar to this.

Next, the operation of the scroll compressor will be explained according to the flow of working gas. The low-temperature, low-pressure working gas is introduced from the suction flO as shown by the solid line arrow, reaches the suction port l1 of the fixed scroll 5, reaches the compression element, and then enters the pressure chamber 8 formed by both scroll members. be introduced. The orbiting scroll 6l2) Due to the orbital movement that is prevented from rotating, the compression chamber 8 gradually contracts and moves to the center of the scroll, and the pressure of the working gas is increased and flows through the central discharge hole 9.
The gas is discharged, becomes a high temperature and high pressure gas, passes through the upper space 1a in the closed container 1, and then passes through the passage 12atl2tb to fill the space 1b around the tMJb machine, and then flows through the discharge pipe 13.
is led out to the outside at a high discharge pressure Pd. The oil injector tube 14a is connected to an oil injector hole l5 provided in the end plate of the fixed scroll 5. In the figure, solid line arrows indicate the flow direction of working gas, and dashed line arrows indicate the flow direction of oil.

Next, the oil injection portion will be described in detail below with reference to FIGS. 1 to 3. The state shown in FIG. 1 is a case where the tip of the wrap portion 6C of the orbiting scroll is in a position to close the oil injection hole 15 when the orbiting scroll 6 makes an orbiting motion. FIG. 2 shows a longitudinal sectional view of the oil injection hole 15 in the state shown in FIG. 1. FIG. 8D state is a longitudinal sectional view when the tip of the wrap portion 6C of the orbiting scroll is in a position where it does not block the oil injector hole 15 when the orbiting scroll 6 makes an orbiting motion. In this state, oil is injected into the compression chamber 8 from the oil injection hole l5. During operation of the pressure d machine, the states shown in FIG. 2 and state D shown in FIG. 8 are alternately repeated, and oil is intermittently injected into the compression chamber 8 from the oil injection hole 15. In addition, oil injection hole 1
Since the wrap portion 6GK of the orbiting scroll 5 is intermittently blocked, pressure pulsations occur within the oil injection hole. As shown in FIG. 1, when the compressor is stopped, the airtight container 1, oil injector 71, pipes 14a, 14b, bubble 71, space 20
The pressure inside is uniform, and the oil in the oil injectors 7 fl4a and 14b falls downward by gravity and moves toward the pressure chamber 8 and the oil cooler 18, respectively. Therefore, the upper part of the bag 71 and the space 20 is filled with working gas. When the compressor is started, oil supplied through the oil injector pipe is injected into the compression chamber 8 through the oil injection hole 15, mixed with the working gas, and becomes high temperature and high pressure with the working gas, and is discharged from the discharge hole. 9 and discharged into the upper space 1a. Next, it passes through the passages 11a I 12b and reaches the space 1b of the electric motor D, where the working gas and oil are separated. The oil that has been increased by +111 drops to the lower part of the sealed container IO and is stored therein.

The oil 16 separated and stored in the lower part comes out from the oil take-out pipe 17 at a discharge pressure Pd, is cooled in the oil cooler 18, and is depressurized in the pressure reducing device Titl9, after which the oil injection ll4b is Enter the buffer space 20 from the street buffer space population 22 . Thereafter, the working gas is injected from the bubble 7 air space outlet 2B through the oil injection pipe 14a and into the compression chamber to cool the working gas. As mentioned above, pressure pulsations occur within the oil injector four holes 15, and these pressure pulsations are caused by the oil injector tube 14a.
The operation that occupies the upper space of the buffer space zOO acts to suppress pressure pulsations due to the compressibility of the oil D. Therefore, the pressure pulsation in the oil injection pipe 14b connected to the buffer space population 22 is suppressed, and the piping system DS
It has the effect of reducing motion. Even if the oil injection amount further increases and the pressure pulsations increase, the volume of the buffer space 20 is increased and the volume occupied by 2 liters of working gas is increased to suppress the pressure pulsations and reduce the vibrations of the piping system. I can do it.

FIG. 4 shows another embodiment of the present invention, which differs from FIG. 1 in that the buffer space population z2 and the buffer space exit 28 are opened at the bottom of the bubble space 20. It is. As a result, the volume of the working gas z1D occupying the upper part of the buffer space 20D can be increased, so that the pressure transmitted from the oil injector vent hole 15 to the oil 16a in the buffer space 20 via the oil injector pipe 14a is increased. The effect of suppressing pulsation can be increased.

Therefore, according to this embodiment, the oil injection pipe 14b
This has the effect of further suppressing pressure pulsations within the piping system and further reducing vibrations in the piping system.

FIG. 5 shows still another embodiment of the present invention D.
The difference from the drawing is that a buffer space 20 is provided in a sealed container 61 and an oil injection hole 15 and a buffer space 20 are connected. The oil injection pipe 14b passes through the upper part of the closed container 1 and is connected to the buff 1 and the space 20. Similar to the embodiment shown in FIG. 1, this embodiment suppresses pressure pulsations in the oil injector pipe 14b due to the compressibility of the working gas 21.2) in the bubble space 20, thereby reducing vibrations in the piping system. Can be made smaller. Furthermore, in this embodiment, pressure pulsations are reduced inside the closed container 10, so that pressure pulsations are not transmitted to the outside of the closed container 61, and the piping system D vibration reduction effect is even greater.

FIG. 6 shows another D embodiment of the present invention.
The difference from the figure is that the buffer space 20 is constructed by a part of the fixed scroll 5 and a cover 24, and the buffer space 200 can be installed at a lower position by being placed inside the closed container l. Therefore, according to this embodiment, the closed container l
There is an advantage that pressure pulsations are not transmitted to the outside of D, the WRJ reduction effect of the piping system is large, and the height of the closed container 1/) can be reduced.

FIG. 7 shows another embodiment of the present invention.
What is different from the diagram is that the buffer space 20 is divided into spaces 21) by a diamond 7mm 25 molded from a rubber material with large elastic deformation, and one space has a compressible gas 26.
and one g of buffer between θ! This is the point at which the space entrance 22 and buffer space exit 28 are opened. During steady operation, in the space on the side where the buffer space population 22 and the outlet 23 are opened, the working gas 21 occupies the upper part and the oil 16a occupies the lower part, similar to the embodiment shown in FIG. The pressure pulsations generated in the oil injection hole 15 are transmitted to the lower O oil 16 in the space zO of the Teba 71 via the oil injection pipe 14a.
a and the working gas z1, and furthermore, the compressible gas 26
It is transmitted to Here, the compressible gas 26 and the working gas 21 have compressibility and act to suppress pressure pulsations.

Therefore, according to the present invention, it is possible to suppress pressure pulsations in the oil injection pipe 14b connected to the buffer space z2 and reduce vibrations in the piping system. here,
Oil 16a at the bottom of the bag 71 and space 20 due to changes in pressure etc.
When the O oil supplement fluctuates and the working gas 2l mixes into the oil 1aaD, the mixed working gas flows out into the oil injection pipe 14b together with the oil, so the volume of the working gas 2112) in the lower part of the buffer space decreases. . Working gas 210 oil 1
If D continues to be mixed into Qav, the buffer space gO
The entire space below D will now be filled with oil lea, and the pressure pulsation reduction effect of the working gas 21 will no longer be obtained;
Since the compressible gas 26 acts to suppress pressure pulsations through the elastic deformation of the diamond 7 z5D, pressure pulsations can be reliably reduced. Therefore, according to this embodiment, the working gas z
Regardless of the presence or absence of 1, the oil injector piping 14b
It is possible to stably reduce vibrations in piping systems including

Note that the method of reducing vibrations in the oil injection piping system by using compressible gas sealed in the buffer space by a diaphragm was shown only in the embodiment shown in FIG.
Even if the present invention is applied to the actual examples shown in Figs., 5 and 6, vibrations in the piping system including the oil injection pipe 14b can be stably reduced.

[Invention D effect]

As explained above, according to the present invention, the oil injector w
It is possible to suppress pressure pulsations transmitted from the holes.
It is possible to provide an oil injector mechanism for a scroll compressor that can reduce vibrations in a piping system including an oil injector pipe and has excellent reliability.

In addition, by utilizing the pressure dynamic reduction effect of the compressible gas sealed within the buffer space by the diaphragm, the oil injector can be used regardless of the operating conditions. It is possible to reliably reduce vibrations in the piping system including the pipe.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention, showing a scroll compressor s'rrm diagram equipped with an oil injection mechanism and a structural diagram showing a piping system connected to the compressor. 2 and 8 are enlarged views of the oil injector part in FIG.
The case where the hole is in a position where it is blocked and the case where it is in a position where it is not blocked are shown. Figures 4 and 5. FIGS. 6 and 7 are longitudinal sectional views of the scroll pressure am showing other embodiments of the present invention D, respectively. 5...Fixed scroll 6...Orbiting scroll 6
G... Wrap 8... Compression chamber 14a * 1
4lb...Oil injection tube 15...Oil injector 7 hole 16a...Oil 20...Buffer space 21...Working gas 2z...Buffer space population z8...Bub 7 earth space exit
25...Diaphragm 2tls...Compressible gas. Rod 2 Figure 3ml Raro 20 8m-/F-P Bizono z1 Fur M 2 De Diaplum zb hmlt>f1's

Claims (1)

[Claims] 1. It has an orbiting scroll and a fixed scroll consisting of an end plate and a spiral wrap standing upright on the end plate, and both scrolls are combined with each other with the wraps facing inward, and each wrap and A device that compresses gas by moving an orbiting scroll relative to a fixed scroll so that the volume of the space formed by the end plate decreases as it moves toward the center of the scroll. An oil injection mechanism for a scroll compressor, characterized in that a buffer space is provided in an injection piping system connected to the injection hole. 2. The oil injection device for a scroll compressor according to claim 1, wherein the buffer space inlet and outlet are opened at the bottom of the buffer space. 3. The oil for the scroll compressor according to claim 1, wherein the buffer space is divided into two spaces by a diaphragm, one space is filled with a compressible gas, and the other space has an inlet and an outlet of the buffer space. injection device.