JP2549578B2 - Scroll fluid machinery - Google Patents

Description

TECHNICAL FIELD The present invention relates to a scroll fluid machine, and more particularly to an oil supply device for the scroll fluid machine.

[Conventional technology]

FIG. 2 is a cross-sectional view of a conventional scroll fluid machine disclosed in, for example, Japanese Patent Laid-Open No. 62-87693, in which 1 is a casing, 2 is a casing mounted inside the casing 1, and an oil return hole 2a is vertically penetrated. 3 is a bearing support joined to the flange 2, and has a cylindrical boss portion 3a formed in the center. Reference numeral 4 denotes a motor, and the upper end of the motor shaft 4a is rotatably supported in the boss portion 3a. 4b is an eccentric hole formed in the upper end of the motor shaft 4a, 4c is an oil supply passage communicating the eccentric hole 4b with the lower end, and 5 is an orbiting scroll in which a spiral portion 5b is erected on a base plate portion 5a. Shaft part 5c protruding to the opposite side of spiral part 5b has an eccentric hole
It is fitted to 4b. Reference numeral 6 denotes a fixed scroll in which a swirl portion 6b is provided upright on a base plate portion 6a, which is coupled to the bearing support 3 and cooperates with the orbiting scroll 5 to form a compression chamber 7.
Reference numeral 8 denotes a trochoid pump which is arranged between the bottom surface 4d of the eccentric hole 4b and the lower end 5d of the shaft portion 5c and which is connected to the shaft portion 5c.
An oil intake port 4e communicating with the oil supply passage 4c is formed on the bottom surface 4d of the
A discharge port 5e is formed at the lower end 5d of the shaft portion 5c. Reference numeral 9 denotes oil contained in the bottom portion of the casing 1, in which the lower end of the motor shaft 4a is immersed. Reference numeral 10 is a well-known rotation preventing mechanism for preventing rotation of the orbiting scroll 5, 15 is an intake port communicating with the inside of both scrolls 5 and 6, 13 is an exhaust port for discharging gas to the outside of the casing 1,
11 is a discharge port formed in the base plate portion 6a of the fixed scroll 6,
Reference numeral 16 is an exhaust chamber formed in the upper part of the casing 1.

Next, the operation will be described. First, when the motor shaft 4a rotates, as is well known, the orbiting scroll 5 revolves, takes in gas from the intake port 15, compresses the gas in the compression chamber 7, and exhausts it from the discharge port 11 formed in the bed plate 6a. The air is exhausted to the outside of the casing 1 through the exhaust port 13 of the chamber 16. On the other hand, the shaft portion 5c of the orbiting scroll 5 is fitted in the eccentric hole 4b of the motor shaft 4a,
When the motor shaft 4a rotates, the shaft portion 5c of the orbiting scroll 5 tends to eccentrically rotate. However, since the rotation preventing mechanism 10 is provided between the orbiting scroll 5 and the bearing support 3, the orbiting operation is performed. Will be done. Therefore, the shaft 5c and the eccentric hole
The trochoid pump 8 arranged between the bottom surface 4d of the 4b and the inner surface of the eccentric hole 4b operates to pump the oil 9 into the oil supply passage 4
c, the oil suction port 4e, the trochoid pump 8 and the discharge port 5e, and lubricates the outer periphery of the shaft portion 5c and the sliding portion of the lower surface of the orbiting scroll 5, and from the oil return hole 2a to the bottom portion of the casing 1. Will be returned.

[Problems to be Solved by the Invention]

The conventional scroll fluid machine is configured as described above, and when water vapor is sucked in through the intake port 15, the water vapor is mixed with oil as water and returned to the bottom of the casing 1 through the oil return hole 2a. Since this oil containing water is agitated by the motor shaft 4a, the water and oil are not separated, and the oil containing water is supplied to the oil supply passage 4c.
Since it is supplied via a vacuum, problems such as poor vacuum drawing due to poor compression of the scroll portion, seizure due to insufficient lubrication, and rusting occurred. Further, since the operation is continued under a high pressure due to the influence of water vapor, there is a problem that oil smoke is emitted from the exhaust port 13 and the oil is significantly reduced.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a scroll fluid machine capable of preventing poor vacuuming, seizure, rusting, or oil reduction.

[Means for solving the problem]

A scroll fluid machine according to the present invention is provided outside a casing, and an oil storage tank which is inserted through the casing and connected to an oil return hole provided in a scroll support member, and one end of which is inserted into the oil storage tank. In addition, the other end is provided with an intake pipe connected to the oil intake port of the oil supply pump.

Further, in addition to the above-mentioned means, the scroll fluid machine according to the present invention includes an oil mist prevention unit that is connected to the exhaust port of the casing and that prevents oil from scattering, and an oil return unit that connects the oil mist prevention unit and the oil storage tank. It has a tube.

[Work]

In this invention, when the water contained in the gas taken in from the outside of the casing is mixed with the lubricating oil in the compression process,
The water vapor is discharged to the outside of the casing and the remaining water is separated from the oil and water because there is no agitation by the motor while it is stored together with the oil from the oil return hole to the oil storage tank provided outside the casing. , Only the oil located at the top is taken up by the pump.

Further, according to the present invention, the oil ejected from the exhaust port of the casing to the oil mist prevention unit during operation is returned to the oil storage tank during the rest.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a vertical sectional view according to a first embodiment of the present invention,
Reference numeral 20 denotes an oil storage tank for storing the oil 9, the upper end of which is inserted through the casing 1 and connected to the oil return hole 2a of the flange 2 (support member) to collect and store the oil in the exhaust chamber 16. Further, 19 is an oil of the trochoid pump 8 (pump) formed on the bottom surface 4d of the eccentric hole 4b of the motor shaft 4a by extending one end into the oil storage tank 20 and the other end penetrating the boss portion 3a of the bearing support 3. The suction pipe communicates with the suction port 4e.

Next, the operation will be described. When the motor shaft 4a rotates, the orbiting scroll 5 revolves, gas is taken in through the intake port 15, the gas is compressed in the compression chamber 7 between the fixed scroll 6 and the casing 1 through the exhaust port 13 through the discharge port 11. Exhaust outside. On the other hand, the shaft portion 5c of the orbiting scroll 5 is fitted into the eccentric hole 4b of the motor shaft 4a, and when the motor shaft 4a rotates, the shaft portion 5c of the orbiting scroll 5 also tries to eccentrically rotate. Since the rotation prevention mechanism 10 is provided between the bearing support 3 and the bearing support 3, the oscillating scroll 5 oscillates. Therefore, the trochoid pump 8 arranged between the shaft portion 5c and the bottom surface 4d of the eccentric hole 4b performs a pumping operation between the trochoid pump 8 and the inner surface of the eccentric hole 4b, and the oil 9 in the oil storage tank 20 receives the suction pipe 19, Shaft through oil inlet 4e, trochoid pump 8 and outlet 5e
Lubricate the outer periphery of 5c and the lower surface of the orbiting scroll 5, and return to the oil storage tank 20 through the oil return hole 2a. Here, when water is sucked in through the intake port 15, it is discharged through the exhaust port 13 together with the compressed gas, but part of it is mixed with the oil 9 and returns into the oil storage tank 20 through the oil return hole 2a. Then, in the oil storage tank 20, oil and water are separated, and the water is stored in the oil storage tank.
Since it accumulates in the lower part of the inside of 20, it does not return to the trochoid pump 8 via the suction pipe 19. Therefore, it is possible to prevent defective vacuuming, seizure, and rust. Further, since the oil storage tank 20 is provided outside the casing, the amount of oil is not particularly limited, and even if the amount of oil 9 is increased, stirring by the motor shaft 4a or the like does not occur, and water and oil are separated.

By making part or all of the oil storage tank 20 transparent or semi-transparent, the degree of dirt of the oil 9 and the degree of accumulation of water can be visually checked, and appropriate measures can be taken. Further, as shown in FIG. 3, by providing the valve 21 at the bottom of the oil storage tank, the water accumulated from the oil storage tank 20 can be easily drained even if a large amount of water is sucked in, and continuous operation is possible. Will also be possible. Also, as shown in FIG.
A filter that allows only water to pass through the bottom of the oil storage tank 20
By providing 22, it is possible to automatically discharge only water from the inside of the tank 20. Further, as shown in FIG. 5, a discharge pipe 18 having an electromagnetic valve 24 is provided in the lower portion of the tank 20, and a float switch 23 is provided in the tank 20,
Even if the float switch 23 operates to open the solenoid valve 24 for a certain period of time when the oil level reaches a predetermined position, water can be automatically discharged. By the way, when the water is discharged from the tank 20 as shown in FIGS. 3 to 5, the oil 9 is not sucked when the oil level becomes lower than the lower end of the suction pipe 19, but there is such a fear. In this case, as shown in FIG. 6, a spare tank 30 is provided above the oil storage tank 20, and when the float switch 23 in the tank 20 detects a decrease in oil level due to drainage by the valve 21, the spare tank 30
The solenoid valve 24 may be opened to replenish the oil.
Further, as shown in FIG. 7, the oil storage tank 20 may be provided with an exhaust port 17 to discharge water as water vapor.
Further, as shown in FIG. 8, a float 26 is provided at the lower end of the suction pipe 19 so that the lower end of the suction pipe 19 moves up and down according to the vertical movement of the oil surface, so that the suction of oil from the suction pipe 19 is prevented. It may be done without fail.

FIG. 9 shows still another embodiment of the present invention, in which 28 is an oil mist prevention unit connected to the exhaust port 13, 25 is an opening 20a at the upper end of the oil storage tank 20 and the oil mist prevention unit 28 is drained. An oil return pipe, which is connected to the mouth 28a and has a sealing member 29 in the middle thereof, 27 is water stored in the lower part of the oil storage tank 20.

Next, the operation of the configuration shown in FIG. 9 will be described. Since the basic operation is the same as that of each of the above-mentioned embodiments, its explanation is omitted.
Here, when water vapor is taken in through the intake port 15, this water vapor is compressed together with the gas, enters the oil mist prevention unit 28 through the exhaust port 13, and is discharged to the outside through the opening 28b.
However, a part of the oil is mixed with oil and enters the oil storage tank 20 through the oil return hole 2a, the oil 9 and the water 27 are separated in the oil storage tank 20, and the water 27 is accumulated in the lower part. Therefore, the trochoid pump 8 is not sucked through the suction port 19a. The water 27 is regularly discharged by a discharging means (not shown) and does not reach the suction port 19a. Also, if a large amount of water vapor is inhaled, it will be compressed into water,
The pressure of the intake port 15 increases depending on the saturated vapor pressure of water, and a large amount of oil vapor is discharged from the exhaust port 13 together with the gas. The oil mist prevention unit 28 is provided to prevent scattering of mist in which oil vapor and gas are mixed, but if the operation continues under high pressure, a large amount of oil flows into the oil mist prevention unit 28. By returning a large amount of this inflowing oil to the oil storage tank 20 via the oil return pipe 25, it is possible to prevent a decrease in the amount of oil. The sealing member 29 is for preventing gas or oil from flowing back from the oil storage tank 20 to the oil mist prevention unit 28 due to pressure during operation of the motor 4.
A circuit as shown in FIG. 10 may be provided so that the related operation with respect to is automatically performed. That is, the switch 32 of the electromagnetic valve 31 as the sealing member 29 and the switch 33 of the motor 4 are interlocked with each other, and when the switch 33 is closed and the motor 4 is operating, the switch 32 is opened to open the electromagnetic valve 31. Is closed, the switch 33 is opened, and the switch 32 is closed while the motor 4 is not operating to close the electromagnetic valve.
Open 31 and return the oil accumulated during operation from the oil mist prevention unit 28 to the oil storage tank 20 via the oil return pipe 25.

〔The invention's effect〕

As described above, according to the present invention, the oil storage tank is provided separately from the casing, and the oil is supplied from the oil storage tank to the pump. Therefore, even if the moisture in the intake air is mixed with the oil. This moisture is discharged as water vapor to the outside of the casing, the remaining moisture and oil are separated in the oil storage tank, and only the upper oil is supplied to the pump, preventing poor vacuuming, seizure, and rusting. can do. Also, the restriction on the amount of oil can be eased,
Even when the amount of oil is increased, it is possible to prevent water from being mixed with oil by stirring such as the motor shaft.

Further, according to the present invention, since the oil mist prevention unit and the oil storage tank are connected, the oil accumulated in the oil mist prevention unit due to oil smoke from the exhaust port returns to the oil storage tank to prevent a decrease in the amount of oil. This makes it possible to operate for a long time in a high pressure atmosphere.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a scroll fluid machine according to an embodiment of the present invention, FIG. 2 is a vertical sectional view of a conventional scroll fluid machine, and FIGS. 3 to 6 and 8 are other sectional views of the present invention. Sectional drawing of oil supply mechanism of scroll fluid machine according to Example, No. 7
FIG. 9 and FIG. 9 are longitudinal sectional views of a scroll fluid machine according to still another embodiment of the present invention, and FIG. 10 is an operation circuit for a motor and a sealing member in the scroll fluid machine according to the embodiment of the present invention shown in FIG. It is a figure. 1 ... Casing, 2 ... Flange (supporting member), 2a ...
… Oil return hole, 4 …… Motor, 4e …… Oil inlet, 5,6 ……
Scroll, 7 ... Compression chamber, 8 ... Trochoid pump (pump), 9 ... Oil, 13 ... Exhaust port, 15 ... Intake port,
19 …… Suction pipe, 20 …… Oil storage tank, 25 …… Oil return pipe,
27 …… Water, 28 …… Oil mist prevention part, 29 …… Sealing member. The same reference numerals in the drawings indicate the same or corresponding parts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-59-60091 (JP, A) Actually open 1-88089 (JP, U) Actually open 59-165591 (JP, U)

Claims (2)

(57) [Claims] 1. A gas supported by a support member (2) in a casing (1) and taken from the outside of the casing through an intake port (15) is compressed to the outside of the casing through an exhaust port (13). And a pair of scrolls (5,6) to discharge
A motor (4) provided in the casing for driving the scroll to perform a compression operation, a pump (8) provided in the casing for supplying oil to a sliding portion of the scroll, and the casing. An oil storage tank (20) which is provided outside and communicates with the exhaust chamber (16) in the casing to collect and store oil in the exhaust chamber, and one end of which is inserted into the oil storage tank. A suction pipe (19), which is arranged so as not to suck in the separated water in the oil below and sucks the oil, and the other end of which is connected to the oil suction port (4e) of the pump. Characteristic scroll fluid machine. 2. A gas supported by a supporting member (2) inside the casing (1) and taken from the outside of the casing through an intake port (15) is compressed to the outside of the casing through an exhaust port (13). And a pair of scrolls (5,6) to discharge
A motor (4) provided in the casing for driving the scroll to perform a compression operation, a pump (8) provided in the casing for supplying oil to a sliding portion of the scroll, and the support. An oil return hole (2a) provided in a member for returning the oil supplied to the scroll, and an oil storage provided outside the casing and inserted into the casing and connected to the oil return hole to store oil The tank (20), one end of which is inserted into the oil storage tank and is arranged so as not to suck the separated water downward in the oil of the oil storage tank, and the other end of which is located at the oil intake port (4e) of the pump. ) Connected to the suction pipe (19), an oil mist prevention unit (28) connected to the exhaust port of the casing to prevent oil from scattering, and the oil mist prevention unit to the oil storage tank. Oil return A scroll fluid machine comprising: a pipe (25); and a sealing member (29) provided on the oil return pipe and sealing the oil return pipe during operation of the motor.