JPS60224990A - Scroll type compressor - Google Patents

Abstract

PURPOSE:To aim at preventing lubrication from deteriorating upon starting, by forming an oil discharge passage at a position such that the oil level of lubrication oil reserved in a reservoir tank is scattered by a rotating balancer, and so that the lubrication oil having an oil level allowing the oil to be scattered may be reserved. CONSTITUTION:A balancer 10 for a crankshaft 4 is disposed in an oil reservoir section 9 formed in a frame 6 confronting a high pressure chamber 7. An oil discharge passage 11 is formed in the oil reservoir section 9, and therefore the oil discharge passage 11 allows the reservoir tank to reserve therein lubrication oil at a level such that it gives no large rotational resistance against the balancer 10 and it may be scattered by the rotating balancer 10. With this arrangement oil may be surely fed to various bearing parts by means of the balancer 10 upon starting of the compressor so that it is possible to prevent lubrication from deteriorating, and further, it is possible to effect smooth rotational drive for the crankshaft 4 with no rotational resistance being applied to the balancer 10 by lubrication oil.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention relates to a scroll compressor, specifically, a compression element consisting of a fixed scroll and a revolving scroll is installed in the upper part of a hermetic casing, and the revolving scroll is installed in the lower part. The present invention relates to a scroll type compressor, which is equipped with a motor equipped with a crankshaft that drives the revolving scroll, and discharges compressed fluid into the sealed casing.

(Prior art) Generally, this type of scroll type pressure NJm has a compression element consisting of a fixed scroll and a revolving scroll installed in the upper part of a closed casing, and a motor with a crankshaft installed in the lower part of the casing. The crankshaft is bearing-supported by a frame that fixedly holds the fixed scroll, and the upper end of the crankshaft is coupled to the revolving scroll, so that the revolving scroll is rotated by rotation of the crankshaft as the motor is driven. The orbiting scroll is driven to compress fluid between the orbiting scroll and the fixed scroll.

However, in the scroll type compressor described in @, it is necessary to supply oil to the bearing between the crankshaft and the frame, the joint between the upper end of the crankshaft and the revolving scroll, etc., and generally it is necessary to supply oil to the crankshaft. A passage is formed, and as the crankshaft rotates, lubricating oil is pumped up from the oil chamber at the bottom of the sealed casing through the oil supply passage, and the bearing part, the coupling part, etc. In the throat oil supply means, when starting up the compressor, etc., there is a time delay between drawing oil from the oil supply passage and supplying the oil to the bearings, joints, etc., and there is a risk of poor lubrication.

Therefore, in the past, a crankshaft (4
) is formed with an oil supply passage (14) penetrating in the vertical direction, and a communication passage (50) is formed on the back side of the revolving scroll (3).
An intermediate fluid intermediate chamber (51) having an intermediate pressure between the discharge pressure and the suction pressure is provided through the intermediate chamber (51), and the oil storage section (9) is formed in the intermediate chamber (51). A balancer (10) provided on the crankshaft (4) is disposed in the oil storage portion (9) of the crankshaft (4).
By introducing the intermediate fluid into the intermediate chamber (51) with the rotation of the
The lubricating oil stored in the oil storage part (9) is transferred between the crankshaft (4) and the frame (6) by the intermediate pressure of the intermediate fluid.
It was proposed that the bearing metal (m,) K be lubricated between the bearings to solve the problem of poor lubrication during startup.

In addition, in FIG. 2, (18) is an Oldham ring.

In the oil supply mechanism configured as above, the intermediate chamber (51) communicates with the meshing portion between the revolving scroll (8) and the fixed scroll (2) via the communication path (50). During operation, the lubricating oil pumped into the oil supply passage (14) of the crankshaft (4) is transferred from the oil chamber (52) provided at the end of the crankshaft (4) to the bearing metal (m, ) is supplied with oil, then guided to the oil storage part (9) and passed through the communication path (50) to the n-th revolving scroll (8
) and the fixed scroll (2). The oil supplied to the bearing metal (m,) is also led to the oil storage part (9)K and similarly discharged to the meshing part of the revolving and stationary scrolls (2) and (8).

(Problem to be solved by the present invention) However, as described above, lubricating oil is applied to each bearing metal (m).

), (m,)K, the lubricating oil is guided to the oil storage part (9), but since this oil storage part (9) has an intermediate pressure, it is not possible to configure oil level control, and the oil storage part (
9) After entering the compression chamber through the communication path (50), there is a risk that the oil will be included in the discharge gas and flow out of the machine, and the oil that has accumulated in the oil storage section (9) may Because the balance weight rotates inside, extra power is required.

The problem to be solved by the present invention is to store lubricating oil in the oil storage part at a level that does not create a large rotational resistance of the balancer and can be scattered by the rotation of the balancer. The object of the present invention is to enable smooth rotation of the crankshaft without causing poor lubrication during startup.

(Means for Solving the Problems) According to the configuration of the present invention, a compression element consisting of a fixed scroll and a revolving scroll is installed in the upper part of a hermetic casing, and is coupled to the revolving scroll in the lower part, and the revolving scroll is A motor with a driving crankshaft is installed inside,
A scroll I-type compressor configured to discharge compressed fluid into the hermetic casing (in which a part of the discharged fluid is guided between the revolving scroll I retroframe and the revolving scroll is directed toward the fixed scroll side). A high-pressure chamber to be pressed is formed through a seal ring, and a lubricating oil reservoir is provided in the frame facing the high-pressure chamber, and a balancer provided on the crank shaft is disposed in the oil reservoir. On the other hand, the frame is provided with an oil drainage passage that opens into the oil storage part, and the oil drainage passage is located at a position where the oil level of the lubricating oil stored in the oil storage part is at a height at which it is scattered by the rotation of the balancer. It was established in

(Function) Since the oil level in the oil storage section is always maintained at an appropriate level by the oil drain passage, the lubricating oil in the oil storage section is scattered by the balancer even during startup to lubricate the lubricated parts. Moreover, there is no possibility that too much lubricating oil will accumulate in the oil storage portion and give unnecessary rotational resistance to the balancer of the crankshaft.

(Example) The scroll compressor according to the present invention will be described below with reference to the embodiments shown in the drawings.

The scroll compressor shown in the drawing has a closed casing 9'C.
A compression element (C) consisting of a fixed scroll (2) and a revolving scroll (8) is installed in the upper part of the casing (1), and a crankshaft (4) is also installed in the lower part of the casing (1). while attaching a bearing metal (ml) to the upper end of the crankshaft (4) to the revolving scroll (8).
), the revolution scroll (8) is driven to revolve by the rotation of the crankshaft (4) accompanying the morph (M), and the spiral wrap (8a) of the revolution scroll (8) is and the spiral lamp (
2a), and the compressed fluid is discharged into the upper interior of the casing (1) from a discharge port (5) provided at the upper center of the fixed scroll (2).

A frame (6) is assembled into the casing (1) by press-fitting means, and when the fixed scroll (2) is fixed to the frame (6) by staples (B), a trap is formed.
The crankshaft (4) is bearing-supported on the frame (6) through a plurality of bearing metals (m,), and a leg body (6a) is integrally formed on the frame (6). 6
In a), the stator (S) of the R motor (M) is fixed by a stay bolt (B), and the rotor (R) of the morph (M) is fixed to the crankshaft (4).

Therefore, in the scroll type compressor as described above, a part of the discharge fluid is introduced between the frame (6) and the revolving scroll (8) to press the revolving scroll (8) toward the fixed scroll (2). The high pressure chamber (7)
A lubricating oil reservoir (9) is provided in the seventh frame (6) facing the chamber (7) through a seal ring (8), and the crankshaft (4) is provided in the oil reservoir (9). ), and an oil drain passage (11) that opens to the oil storage part (9) is formed in the frame (6), and the oil drainage passage (11) is connected to the oil storage part (9). The height of the curved surface of the lubricating oil stored in (9) is set at a height at which the lubricating oil is scattered by the rotation of the lancer (lO).

Specifically, the orbital scroll (8) of the frame (6)
) is provided with a receiver (12) having an insertion hole (12a) larger in diameter than the crankshaft (4), and the receiver (
An Oldham ring (18) is interposed between the revolving scroll (8) and the revolving scroll (8), and the ring (18) prevents the revolving scroll (3) from rotating. At the same time, the part of the frame (6) facing the receiver (12) is recessed to form the high pressure chamber (7), and the chamber (7) is connected to the oil drain passage (ll). The chamber (7) is connected to a high-pressure discharge region of the fluid via the seal ring (8), and the seal ring (8) is interposed between the receiver (12) and the revolving scroll (8). and the high pressure fluid in the chamber (7) is transferred to the receiver (12).
The revolving scroll (8) is actuated through the push-through hole (12a) of the revolving scroll (3) to the fixed scroll (2).
Make it as if pressing it to the side.

In this way, the revolving scroll (8) becomes the fixed scroll (
2) to prevent the revolving scroll (8) from moving away from the stationary scroll (2), and to hold the revolving scroll (8) in an airtight manner with respect to the fixed scroll (2). A portion (9) is provided, and a side portion of the oil storage portion (9) is provided with a side portion of the oil storage portion (9).
The oil drain passage (11) is formed at a slightly higher level 11KS than the lower end surface of the balancer (10) disposed in the oil storage section (9).
10) without causing a large rotational resistance, and due to the rotation of the balancer (10), each of the bearing metals (m, )
, (m,) are made to store lubricating oil at an oil level that can be refilled by splashing.

The crankshaft (4) is formed with an oil supply passage (14) that penetrates in the vertical direction, and a plurality of branch passages (14a) are provided in the oil supply passage (14), so that the lower end of the crankshaft (4) is provided with a plurality of branch passages (14a). Lubricating oil is pumped up from the oil chamber (16) at the bottom of the sealed casing (1) through a pick-up device (15) provided, and is pumped up through the oil supply passage (14) and each branch passage (14a) to each bearing metal (m , ), (m,) In addition to lubricating other bearing parts, the lubricating oil after lubricating the bearing metal (m) between the upper end of the crankshaft (4) and the revolving scroll (8) is supplied to the oil storage part. It is like storing oil in (9).

In the illustrated embodiment, a communication passage (17) is formed that communicates the upper end of the oil supply passage (14) in the crankshaft (4) with the seal ring (8), and the The lubricating oil supplied to the seal ring (8) passes through the push-through hole (12a) of the receiver (11) to the oil storage part (9). ).

Further, in the illustrated embodiment, a fluid passageway (18) for discharged fluid is formed between the frame (6) and the hermetic casing (1), and compressed fluid is discharged to the inner upper part of the +m casing (1). through the passage (I8) to the casing (1).
) and discharged outward from an external discharge pipe (19) connected to an intermediate point between the frame (6) and the motor (M) in the casing (I), and the oil storage portion (9) The oil drain passage (11) provided in the front ε fluid passage (18)K is opened, and the ejector effect of the fluid passing through the passage (18) actively drains the lubricating oil in the oil storage part (9). However, the amount of oil in the oil storage section (9) is maintained at an appropriate level.

Further, in the illustrated embodiment, a low pressure chamber (12) is provided between the revolving scroll (8) and the receiver (12) and communicates with the low pressure region of the fluid.
20) to exert a pressing effect on the fixed scroll (2) of the revolving scroll (8) by the high pressure fluid in the high pressure chamber (7).

The scroll compressor of the present invention is configured as described above, and the revolution scroll (3) is revolved by the rotation of the crankshaft (4) accompanying the motor (M), and the revolution scroll (8) and The fluid is compressed between the fixed scroll (2) and the compressed fluid is passed through the closed casing (1).
The high-pressure fluid inside the casing (1), which is discharged under internal pressure and discharged to the outside from the external discharge pipe (19), is guided to the high-pressure chamber (7), and the high-pressure fluid is discharged to the outside from the external discharge pipe (19).
is pressed toward the fixed scroll (2), and the sliding contact between the revolving scroll (8) and the fixed scroll (2) is maintained in an airtight manner, ensuring a secure and stable contact between the scrolls (2) and (8). Efficient fluid compression occurs.

Furthermore, when the pressure Nj machine is in operation, the crankshaft (4)
Lubricating oil is pumped up through the oil supply passage (14) in the bearing part of the crankshaft (4) and the seventh frame (6), and the connection between the crankshaft (4) and the revolving scroll (8). A part of this lubricating oil is stored in the oil storage part (9)K of the frame (6).

Incidentally, an oil drainage passage (11) is formed in the oil storage part (9), and the lubricating oil above the passage (11) is discharged, and the oil storage part (9) is filled with oil. ) The lubricating oil is always stored up to a position slightly higher than the lower end surface of the balancer (10), and therefore, when starting up the compressor, etc., the balancer (lO) is used to lubricate the oil storage part (9). The oil is scattered and supplied to the seal ring (8) and the joint, and the balancer (1O) can rotate smoothly without being subjected to large rotational resistance due to the lubricating oil.

(Effects of the Invention) As explained above, in the scroll compressor of the present invention,
A high-pressure chamber is provided between the revolving scroll and the frame, and a part of the discharged fluid is introduced into the chamber, so that the discharged fluid presses the revolving scroll toward the fixed scroll, so that the revolving scroll becomes the fixed scroll. On the other hand, the scrolls can be prevented from moving in the direction of separation, and the space between the scrolls can be maintained in an airtight state, thereby making it possible to reliably and efficiently compress the fluid.

Moreover, an oil storage part is provided in the frame facing the high pressure chamber, and a balancer for the crankshaft is disposed in the oil storage part, and an oil drainage passage is formed in the oil storage part, so that a large part of the balancer can be installed in the oil storage part. Since the lubricating oil is stored at a level that does not cause rotational resistance and can be dispersed by the rotation of the balancer, the balancer can reliably trap and lubricate the various bearing parts when the compressor is started, thereby providing lubrication. This makes it possible to prevent defects from occurring, and furthermore, it is possible to smoothly rotate the crankshaft without applying large rotational resistance to the balancer due to lubricating oil.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a scroll compressor according to the present invention, and FIG. 2 is a drawing showing a conventional example. (1)... sealed casing (2)... fixed scroll (3)... revolving scroll (4)... crankshaft (6)... 7 frames (7)...
・High pressure chamber (8) ・Seal ring (9) ・Oil reservoir (10) ・Balancer (11
)...Oil drain passage (C)...Compression element (M)...Motor representative Patent attorney Tsu 1) Hisashi Nao □“、・′ in Figure 2?

Claims (1)

[Claims] (1) An EE compression element consisting of a fixed scroll (2) and a revolving scroll (8) is installed in the upper part of the hermetic casing (1), and is connected to the revolving scroll (8) in the lower part, and the revolving scroll (3) is connected to the revolving scroll (8) in the lower part. The sealed casing (1) is equipped with a motor (M) equipped with a crankshaft (4) that drives the
In a scroll type compressor that discharges compressed fluid into the
1f (, a high pressure chamber (7) is formed via a seal ring (8) to guide a part of the discharged fluid and press the revolving scroll (8) toward the fixed scroll (2). An oil storage part (9) for lubricating oil is provided in the frame (6)K1 facing the high pressure chamber (7)K, and a balancer (lO) provided on the 1m crankshaft (4) is provided in this oil storage part (9)K. On the other hand, an oil drain passage (11) opening to the frame (6)K and the oil storage part (9) is provided, and this oil drainage passage (11) is connected to the oil level of lubricating oil stored in the oil storage part (9). A scroll type compressor, characterized in that the scroll compressor is installed at a position where the height is such that the balancer (10) scatters when the balancer (10) rotates.