JPH0819912B2 - Scroll compressor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a scroll compressor mainly used as a twin type compressor.

(Prior Art) A twin type with two compressors as a set
Since the total capacity can be varied in various ways by changing the sharing capacity of each compressor, it is widely applied to building air-conditioning and the like where load fluctuations are large.

Such twin type compressors are, for example, the actual open sho 59-81791.
As shown in FIG. 5 and shown in FIG. 5, a motor (M) and a compression element (CF) are arranged in a closed casing (C) having an oil sump (a) at the bottom. Has been done,
Two such compressors as a set, in each casing (C) (C) of the first compressor (CP1) and the second compressor (CP2),
The intake pipe (IT) and the discharge pipe (OT) are connected to each other.

Then, in order to correct the oil level imbalance caused by the pressure difference in each casing (C) (C) based on the difference in the sharing capability of each compressor (CP1) (CP2), each casing (C) ) Oil sump (a) provided at the inner bottom of (C)
Oil equalizing pipes (T) are opened near each other near the oil level in (a).

(Problems to be Solved by the Invention) As described above, in the case where the oil equalizing pipe (T) is connected, the oil level of one compressor (for example, CP1) is equal to the oil equalizing pipe (T).
It is expected that oil will be transferred to the other compressor (CP2) if it rises above the opening height of, and oil will be introduced from the other if it falls below the opening height of the oil equalizing pipe (T). Therefore, originally, even if the oil level is lowered below the opening height of the oil equalizing pipe (T), it is considered that there is no movement of oil from the compressor having the lowered oil level to the other compressor. .

However, there is a pressure difference between the casings (C) and (C) based on the difference in the sharing capacity of the compressors (CP1) and (CP2), and during operation, the casings (C) are also
In (C), a large amount of oil mist such as return oil after refueling the lubricated parts and oil scattered by the rotating parts will be generated. Therefore, for example, the high pressure side compressor (CP1)
Even if the oil level goes below the opening position of the oil equalizing pipe (T),
Compressor on the low pressure side through the oil equalizing pipe (T), for example (CP2)
It means that a large amount of oil mist is moved.

As a result, one compressor (CP1) may run out of oil, impairing lubrication performance, and the other compressor (CP1)
In 2), there was a problem that excessive lubrication resulted in adverse effects such as oil compression.

The present invention has been made in view of the above problems, and an object thereof is to reduce the amount of movement of oil mist to reduce problems such as deterioration of lubrication performance due to oil shortage in the casing and oil compression due to excessive oil supply. An object of the present invention is to provide a scroll compressor that can be prevented.

(Means for Solving the Problem) In order to achieve the above object, in the present invention, a fixed casing and a movable scroll (2) (3) are provided in a closed casing (1) provided with an oil sump (1a) at the bottom. A scroll type compressor in which a compression element (4) is installed and one end of an oil equalizing pipe (8) which is interposed between the casing (1) and an external compressor for parallel operation is opened. The lower part of the casing (1) near the oil sump (1a).
Has a side wall (93) immersed in the oil and an upper wall (92) facing the oil surface at a predetermined distance above the oil surface.
A partition body (9) defining an oil leveling chamber (10) which is hidden from the inside of the casing (1) is interposed between 2) and the side wall (93) and the oil surface. Oil leveling pipe (8)
Is communicated with the oil equalizing chamber (10) through a penetrating portion that penetrates the wall surface of the casing (1).

When disposing the partition body (9) inside the casing (1), a core cut portion (53) is provided on the outer peripheral wall surface of the built-in motor (5) that drives the movable scroll (3). An intake passage (54) for circulating the intake fluid in the vertical direction and an oil passage (55) for circulating the return oil in the vertical direction are formed so that the partition body is provided below the intake passage (54). (9) is arranged.

Further, the oil equalizing chamber (10) may be communicated with the suction passageway (54) through a communication pipe (11).

(Operation) In the scroll compressor described above, the partition body (9) is provided inside the casing (1) near the oil sump (1a).
An oil equalizing chamber (10) hidden from the inside of the casing (1) is formed through the oil equalizing chamber (10), and the oil equalizing pipe (8) is provided in the oil equalizing chamber (10).
The oil mist generated in the casing (1) rarely directly enters the oil equalizing chamber (10), and therefore a large amount of oil mist is contained in the oil equalizing pipe (8). It is prevented from moving through.

Further, a core cut portion (53) is provided on the outer peripheral wall surface of the motor (5), and an intake passage (54) for circulating the intake fluid in the vertical direction and an oil passage (55) for circulating return oil in the vertical direction. When the partition body (9) is arranged below the suction passageway (54) by partitioning and, the suction passageway is affected without affecting the oil return to the oil reservoir (1a). It is possible to reduce the interference of the suction fluid that flows through the (54) in the vertical direction with the oil surface of the oil sump (1a), and to prevent the suction fluid from lifting the oil.

Furthermore, when the oil equalizing chamber (10) is communicated with the suction passageway (54) through the communication pipe (11), the oil equalizing chamber (1
Since 0) has almost the same pressure as the inside of the casing (1), the oil can be smoothly moved through the oil equalizing pipe (8).

(Embodiment) FIGS. 1 and 2 show a twin type in which two first scroll compressors (A) and two scroll compressors (B) are used side by side. The compressor (A) is provided with an unloader piston (100) and is provided with a mechanical unload mechanism (UL) capable of 100% full load and 65% load, and the second compressor (B). ) Is provided with an inverter control circuit (INV) for changing the power supply frequency to the motor (5), and these unloading mechanisms (U
L) and the inverter control circuit (INV) are used to change the operating capacities of the compressors (A) and (B) in various ways so that the total capacity can be varied.

Each of the compressors (A) and (B) has a closed casing (1)
A compression element (4) consisting of a fixed scroll (2) and a movable scroll (3) is disposed on the inner upper side of the
A motor (5) including a stator (51) and a rotor (52) is arranged on the lower side of the compression element (4), and a drive shaft (6) coupled to the rotor (52) of the motor (5). ) Is connected to the movable scroll (3) via a transmission mechanism (7),
The transmission mechanism (7) accompanying the rotational drive of the drive shaft (6)
The movable scroll (3) is revolved with respect to the fixed scroll (2) via the inside of the casing (1) between the casings (1) of the compressors (A) and (B). An oil level equalizing pipe (8) for correcting the oil amount balance of the oil sump (1a) is connected near the oil sump (1a) provided at the bottom.

A suction pipe (1b) and a discharge pipe (1c) are connected to the casings (1) of the compressors (A) and (B), respectively, and the suction pipes (1b) and the discharge pipes (1b) are connected. 1c) 1
An oil separator (OS) for recovering oil from the gas fluid discharged from each discharge pipe (1c) is provided on the discharge side of each discharge pipe (1c) while being connected to two refrigerant pipes. The oil recovered by the oil separator (OS) is returned to each of the casings (1) through an oil return pipe (1d) having a capillary tube (Cp) at an intermediate portion.

Then, in the above-mentioned configuration, in order to prevent the oil mist generated in the casing (1) on the one side from reaching the casing (1) on the other side, the following is done.

That is, as shown in detail in FIGS. 3 and 4, the substantially disk-shaped upper wall (92) having an insertion hole (91) in the center thereof.
A partition body (9) having a pair of side walls (93) (93) radially extended at a predetermined interval is formed on the lower surface side of the upper wall (92).

The partition body (9) formed as described above is provided near the oil sump (1a) on the inner lower side of the casing (1), and the lower ends of the side walls (93) are the oil sump (9). It is immersed in the oil surface of 1a) to a predetermined depth and the upper wall (92)
With the insertion hole (91) inserted into the drive shaft (6) so that the above faces the oil surface above the oil surface with a predetermined gap therebetween, from the upper wall (92) to the motor (5). The fixing bolt (BT) is inserted and fixed to the support member that supports the.

An oil leveling chamber (10) hidden from the inside of the casing (1) is defined between the upper wall (92) and the side wall (93) and the oil surface of the oil sump (1a). Together with the oil equalizing pipe (8) arranged between the casings (1),
The oil equalizing chamber (10) is communicated with the casing (1) through a penetrating portion that penetrates the wall surface of the casing (1).

By doing so, for example, the first compressor (A)
When the side is operated at 100% full load for high capacity and the second compressor (B) side is operated at 30 Hz for 50% load and low capacity, on the side of high capacity first compressor (A) , The internal pressure inside the casing (1) becomes relatively low due to the substantial increase in the amount of air sucked between the scrolls (2) and (3) per unit time, and the second capacity is low. On the compressor (B) side, the internal pressure in the casing (1) becomes relatively high due to the substantial reduction in the intake amount per unit time, and the high pressure side second compressor (B) The generated oil mist tries to move in a large amount to the low pressure side first compressor (A) through the oil equalizing pipe (8), but the high pressure side second compressor (B).
The oil mist generated in 1) exists in the oil equalizing chamber (1) due to the presence of the partition body (9) arranged in the casing (1).
0) is less likely to enter directly, and therefore the oil equalizing chamber (1
A large amount of oil mist is not admitted to the first compressor (A) side from the oil equalizing pipe (8) opened in (0), and each casing (1) in each compressor (A) (B) is The oil level inside () will be maintained properly.

As is apparent from FIG. 3, the stator (51) of the motor (5) is provided with core cut portions (53) at four locations on the outer periphery thereof, and the core cut portions (53) and the casing (1) are provided. A pair of suction passages (54) (54) that allow suction fluid to flow vertically between the inner peripheral surface of the casing (1) and the casing (1).
And a pair of oil passages (55) and (55) that allow the return oil to flow in the same vertical direction, respectively.

In addition, openings (94) (9) communicating with the oil passages (55) are provided in an outer peripheral portion of the upper wall (92) of the partition body (9).
4) are formed to face each other and each of these openings (94)
An opening (95) communicating with one side of the suction passage (54) is formed therebetween, and a part of the upper wall (92) facing the suction passage (54) on the other side is closed, that is, Since the facing portion of the oil equalizing chamber (10) defined between the upper wall (92) of the partition body (9) and the side walls (93) and the oil surface of the oil sump (1a) is closed. is there.

In this case, the oil after supplying the movable parts such as the compression element (4) and the drive shaft (6) to the oil sump (1a) without being obstructed by the partition body (9). It is possible to surely and swiftly return the suction fluid, and the suction fluid flowing in the suction passage (54) in the vertical direction is less likely to interfere with the oil surface of the oil sump (1a).

Further, the oil equalizing chamber (10) hidden from the inside of the casing (1) through the partition body (9) has the oil equalizing chamber (10) as shown in FIGS. 1 and 3. 10) and a suction passage (5) of the motor (5) formed at a position facing the
4) via a communication pipe (11), or although not shown, the oil equalizing chamber (10) is connected to the suction passage (54) formed on the upper side thereof via the communication pipe (11). It is desirable that the oil equalizing chamber (10) has the same high pressure as the inside of the casing (1) via the communication pipe (11). Oil can be smoothly moved from the oil equalizing chamber (10) to the other compressor by the oil equalizing pipe (8).

(Effects of the Invention) As described above, in the scroll compressor of the present invention, the side wall (93) whose lower part is immersed in oil is provided near the oil sump (1a) provided at the inner bottom of the casing (1). ) And an upper wall (92) facing the oil surface at a predetermined distance above the oil surface,
A partition body (9) is defined between the upper wall (92), the side wall (93) and the oil surface to define an oil equalizing chamber (10) hidden from the inside of the casing (1). In addition, since the oil equalizing pipe (8) is communicated with the oil equalizing chamber (10) through the penetrating portion that penetrates the wall surface of the casing (1), a large amount of oil mist generated in the casing (1). Can be prevented from moving to the other side compressor via the oil equalizing pipe (8), and the oil level in the casing (1) can be properly maintained.

Further, a core cut portion (53) is provided on the outer peripheral wall surface of the motor (5), and an intake passage (54) for circulating the intake fluid in the vertical direction and an oil passage (55) for circulating return oil in the vertical direction. By partitioning and forming the partition body (9) on the lower side of the suction passage (54), there is no influence on the oil return to the oil sump (1a), and the suction It is possible to reduce the possibility that the suction fluid, which flows through the passage (54) in the vertical direction, interferes with the oil surface of the oil sump (1a).

Further, when the oil equalizing chamber (10) is communicated with the suction passage (54) through the communication pipe (11), oil can be smoothly moved through the oil equalizing pipe (8).

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a usage mode of a scroll type compressor according to the present invention as a twin type, and FIG. 2 is a plan view of the same.
FIG. 3 is a cross-sectional view showing a main part of the scroll compressor,
FIG. 4 is a perspective view of a partition body, and FIG. 5 is a drawing showing a conventional example. (1) …… Hermetic casing (2)… Fixed scroll (3)… Movable scroll (4)… Compression element (5)… Motor (53)… Core cut part (54)… Suction passage ( 55) …… oil passage (8) …… equalizing pipe (9) …… partitioning body (92) …… upper wall (93) …… side wall (10) …… equalizing chamber (11) …… communication pipe

Claims (3)

[Claims] 1. A hermetic casing (1) having an oil sump (1a) at the bottom thereof is equipped with a compression element (4) having fixed and movable scrolls (2) (3), and the inside of the casing (1). And a scroll type compressor in which one end of an oil equalizing pipe (8) interposed between an external compressor for parallel operation is opened, and an oil sump (1a) in the casing (1) is provided.
Close the side wall (9
3) and an upper wall (92) facing the oil surface at a predetermined distance above the oil surface, and the casing is provided between the upper wall (92) and the side wall (93) and the oil surface. A partition body (9) defining an oil equalizing chamber (10) hidden from the inside of (1) is interposed, and the oil equalizing pipe (8) is provided with a penetrating portion that penetrates the wall surface of the casing (1). A scroll compressor characterized in that it is communicated with the oil equalizing chamber (10) through the scroll compressor. 2. A built-in motor (5) for driving a movable scroll (3) is provided with a core cut portion (53), and an intake passage (54) for circulating an intake fluid in a vertical direction, and return oil in a vertical direction. The oil passage (55) to be circulated is partitioned and the partition body (9)
2. The scroll compressor according to claim 1, wherein the compressor is arranged below the suction passage (54). 3. The scroll compressor according to claim 2, wherein the oil equalizing chamber (10) is connected to the suction passage (54) through a communication pipe (11).