JP2541352B2 - Scroll type fluid machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a scroll type fluid machine used for a refrigerating apparatus or the like.

(Prior Art) Conventionally, this type of scroll-type fluid machine is disclosed in, for example, Japanese Patent Laid-Open No. 2-125986, and as shown in FIG. 4, a fixed scroll (B) and a movable scroll are provided above a casing (A). The scroll (C) is internally mounted via a bearing (D) and an upper housing (F) having a crank chamber (E), and a drive shaft (G) for driving the movable scroll (C) is provided at a lower part. And a compression chamber (J) in which a motor (H) is installed to form an intake gas sucked from the intake pipe (I) into the casing (A) between the fixed scroll (B) and the movable scroll (C). ), Is compressed, and is discharged to the outside from the discharge chamber (K) provided above the fixed scroll (B) through the discharge pipe (L).

Further, a lower housing (M) is provided at a lower portion of the motor (H) to support a lower portion of the drive shaft (G), and a balance weight () is provided on a lower surface of the rotor (N) of the motor (H). O) is provided to improve the rotational balance of the drive shaft (G).

Further, an oil sump (P) is provided in the lower part of the casing (A), and lubricating oil is supplied from the oil sump (P) to lubrication points such as the bearing portion (D) and the crank chamber (E). Or to collect the lubricating oil returning from these lubrication points.

(Problems to be Solved by the Invention) In a compressor having a structure in which the balance weight (O) is provided near the oil surface of the oil sump (P), the balance weight (O) is rotated by the rotation of the balance weight (O). The oil sump (P) is affected by the generated intake gas wind pressure.
The oil surface is disturbed and the oil surface foams. Then, the oil bubbles are agitated by the balance weight (O), sucked into the compression chamber (J) together with the suction gas and compressed, and the power consumption of the motor (H) increases and the input increases. In addition, there is a problem in that the amount of oil rises or the oil bubbles are mixed into the lubricating oil that is supplied to the lubrication location, resulting in poor lubrication.

In order to solve this problem, it is conceivable to provide a partition wall that closes the entire cross section of the casing (A) between the motor (H) and the oil sump (P). If provided, for example, the casing (A)
After attaching the upper and lower housings (F), (M) and the motor (H) to, the air gap between the rotor (N) and the stator in the motor (M), for example, using a searcher (thin plate), When the searcher is inserted from the lower part of the lower housing (M) for measurement, or for optical measurement, there is a problem that the partition wall interferes with measurement.

The present invention has been invented to solve the above problems, and an object thereof is to reduce the generation of oil bubbles due to the rotation of balance weights, to improve the effective oil amount, and to prevent an increase in motor input. In addition, it is possible to easily measure the mounting accuracy of the motor after mounting the motor on the casing while preventing the occurrence of poor lubrication.

(Means for Solving the Problem) In order to achieve the above object, in the present invention, a compression element (2) having first and second scrolls (23) and (26) is provided in an upper portion of a casing (1) and a lower portion of the casing (1). A motor (5) having a drive shaft (4) for driving the compression element (2) is installed inside, and the housing (3) and the lower housing (6) for supporting the drive shaft (4) are provided. A scroll type fluid machine in which an oil sump (7) is provided in a lower portion of the casing (1) and a balance weight (8) is provided on a lower surface of a rotor (51) of the motor (5) in the lower housing (6). ) Has an outer diameter corresponding to the rotation trajectory drawn by the outermost portion of the balance weight (8) in the radial direction, and a shielding portion (9) facing the lower surface of the rotor (51) is provided, The upper part of the shielding part (9) is attached to the bar. Nsu weight (8) than is brought close to the lower surface of the.

(Operation) Since the oil blocking surface of the oil sump (7) located below the rotor (51) and the lower surface of the rotor (51) have the shielding portion (9) interposed therebetween, Since the oil surface is opposed to the shielding portion (9) and the shielding portion (9) is close to the lower surface of the balance weight (8), even if the balance weight (8) rotates, The shielding part (9) can suppress the disturbance of the intake gas by the balance weight (8) in the space below the motor (5), and the wind pressure of the intake gas generated by the rotation of the balance weight (8) is The oil surface, which is blocked by the blocking portion (9) and is located below the blocking portion (9), is not directly affected by the wind pressure of the suction gas.

Therefore, it is possible to prevent foaming of the oil surface due to the oil surface being disturbed by the wind pressure of the suction gas, and as a result, the foaming oil foam that has been conventionally generated is further stirred by the balance weight (8). It is also possible to prevent the oil from being sucked into the compression element (2) together with the intake gas, thereby preventing the oil from rising and thus increasing the input of the motor (5). In addition, since it is possible to prevent oil bubbles from being mixed into the lubricating oil that is supplied to each lubrication point, no lubrication failure occurs.

Further, since the shielding portion (9) has an outer diameter corresponding to the rotation trajectory drawn by the outermost portion of the balance weight (8) in the radial direction, after the motor (5) is attached to the casing (1). When measuring the air gap,
The shielding part (9) can be satisfactorily performed without interfering with this measurement.

(Example) The scroll type fluid machine used for the refrigerating apparatus shown in FIG. 1 has an end plate (2) above the inside of the casing (1).
1) comprises a first scroll (23) on the fixed side having a scroll (22) projecting from it, and a second scroll (26) on the movable side having a scroll plate (25) projecting from the end plate (24), Each spiral body (22)
A compression element (2) forming a plurality of compression chambers (30) between (25) is mounted via the housing (3) having an upper bearing portion (31) and a crank chamber (32), and It is formed above the first scroll (23) via a partition wall (14) of the discharge chamber (12) to which the discharge pipe (11) is connected.

Further, a motor (5) including a rotor (51) having a drive shaft (4) for driving the second scroll (26) and a stator (52) is installed below the inside of the casing (1), A suction pipe (13) is connected between the motor (5) and the upper housing (3).

Further, below the motor (5) is a lower bearing portion (61).
The lower housing (6) having the above is provided, the oil sump (7) is provided in the lower portion of the casing (1), and the balance weight (8) is provided on the lower surface side of the rotor (51).

The drive shaft (4) is rotatably supported by the upper bearing portion (31) provided in the upper housing (3) and the lower bearing portion (61) provided in the lower housing (6), and its lower end is rotatably supported. Is provided with an oil pump (43), an eccentric part (41) is provided at the upper end, and the eccentric part (41) is connected to the second part.
The second scroll (26) is driven by being fitted into a boss portion (27) extending from the scroll (26) to the crank chamber (32) and being driven by the drive shaft (4). Furthermore,
Inside the drive shaft (4), an oil supply passageway (42) is provided which opens at the upper end portion of the drive shaft (4) and whose lower end portion communicates with the oil pump (43).

Incidentally, (28) is a bearing metal provided on the boss portion (27),
(33) and (62) are the upper and lower bearing parts (31), (6
Bearing metal provided in 1). Also (15)
Is an oil return passage for returning the lubricating oil in the discharge chamber (12) to the oil sump (7).

According to the embodiment shown in FIG. 1, in the compressor configured as described above, the lower housing (6) provided below the motor (5) is provided with a central portion as shown in FIGS. 2 and 3. A shaft hole (65) for receiving the lower end of the drive shaft (4)
And a cylindrical housing body (60) provided with
And three legs (64) radially extending outward in the radial direction from which a connecting portion (63) for connecting the side wall of the casing (1) is provided at the tip, and the main body ( On the upper side of 60), that is, on the side of the balance weight (8), a circular shield having a diameter corresponding to the rotation trajectory drawn by the radial outermost part of the balance weight (8) when the rotor (51) rotates. The closing part (9) is integrally provided so that the upper surface of the shielding part (9) faces the lower surface of the rotor (51), and the upper end of the periphery of the shielding part (9) is the balance weight ( It is as close as possible to the surface of the rotation trajectory of 8).

More specifically, the shielding part (9) has a larger diameter than the outer diameter of the cylindrical housing body (60), and its outer diameter is approximately the same as the rotation locus of the balance weight (8). It is formed in a disk shape integrally with the main body (60), and its upper surface is formed so as to project from the upper surface of the leg portion (64) toward the balance weight (8).

It is preferable that the shielding portion (9) is formed integrally with the housing body (60), but it may be combined as a separate body, and the upper surface of the shielding portion (9) has the legs. Division (6
It is preferable that it is made to project from the upper surface of 4) so as to come close to the balance weight (8), but it may be flush with the upper surface of the leg portion (64).

Next, the operation of the scroll fluid machine configured as described above will be described.

The suction gas sucked into the casing (1) through the suction pipe (13) by the rotation of the motor (5) passes through a passage (not shown) provided in the upper housing (3), and the compression chamber ( 30) is sucked into and compressed by the discharge chamber (12) to the outside through the discharge pipe (11), and the oil pump (43) is operated to lubricate the oil sump (7). Oil is supplied to the oil supply points such as the bearing metal (28) (33) and (62) through the oil supply passage (42), and the supplied lubricating oil is supplied to the stator (5).
It falls back to the oil sump (7) through the core cut provided in 2) and returns.

By the way, since the balance weight (8) is rotated by the rotation of the drive shaft (4) in the atmosphere of the intake gas in which the intake gas is interposed, the rotation of the balance weight (8) causes the flow of the intake gas. Occurs, and under the influence of the wind pressure due to this gas flow, the oil surface in the oil sump (7) is disturbed and bubbles start to form.
An upper portion of the lower housing (6) has an outer diameter corresponding to a rotation locus drawn by a radial outermost portion of the balance weight (8) and is opposed to a lower surface of the rotor (51). ) Is provided to bring the upper surface of the shielding portion (9) close to the lower surface of the balance weight (8), so that even if the balance weight (8) rotates, the shielding portion (9) causes the motor (5) to rotate. Balance weight in the space below (8)
It is possible to prevent the intake gas from being disturbed by the balance weight (8). The oil level to be applied is not directly affected by the wind pressure of the intake gas. Therefore, it is possible to prevent foaming of the oil surface due to the oil pressure being disturbed by the wind pressure of the suction gas. As a result, oil bubbles become the balance weight (8).
Since a large amount of oil bubbles are not sucked into the compression chamber (30) together with the suction gas because the oil is not stirred, the oil can be prevented from rising and the motor (5) You can prevent increasing the input, and also
Since it is possible to prevent oil bubbles from being mixed in the lubricating oil that is supplied to each lubrication point, the lubrication failure is not caused in combination with the prevention of oil rising.

Further, since the shielding portion (9) has an outer diameter corresponding to the rotation locus of the outer portion of the balance weight (8), the upper housing for supporting the compression element (2) in the casing (1). (3) When measuring the air gap after mounting the motor (5) and the lower housing (6), use between the legs (64) (64) of the lower housing (6). For example, since a thin and long plate-shaped searcher can be inserted into the air gap from below the lower housing (6), the air gap can be measured by a conventional method. Also, it is possible to measure the air gap.

In the embodiment described above, the shielding part (9) is
The balance weight (8) is formed in a disk shape having a diameter corresponding to the rotation trajectory drawn by the outermost portion in the radial direction. The diameter of the shielding portion (9) is defined by the rotation trajectory of the balance weight (8). The diameter may be slightly smaller than the diameter, and the central portion of the upper surface of the shielding portion (9) is recessed to form the upper surface in a dish shape. The upper surface of the shielding portion (9) is formed in a flat surface shape. May be.

(Effects of the Invention) As described above, according to the present invention, the compression element (2) having the first and second scrolls (23) and (26) is provided on the upper portion of the casing (1), and the compression element (2) is provided on the lower portion. ) Is internally provided with a motor (5) having a drive shaft (4) for driving the drive shaft, and an upper housing (3) and a lower housing (6) for supporting the drive shaft (4) are provided, and the casing (1) is provided. In the scroll type fluid machine in which the oil sump (7) is provided in the lower part of the rotor and the balance weight (8) is provided in the lower surface of the rotor (51) of the motor (5), the balance is provided in the upper part of the lower housing (6). A shielding part (9) having an outer diameter corresponding to the rotation trajectory drawn by the radial outermost part of the balance weight (8) and facing the lower surface of the rotor (51) is provided, and the shielding part (9) is provided. ) The balance weight (8) above Since it brought close to the surface, even if the rotating balance weight (8), the shielding closed part (9) motor (5)
Since it is possible to suppress the disturbance of the intake gas by the balance weight (8) in the space below, the wind pressure of the intake gas generated by the rotation of the balance weight (8) is blocked by the blocking section (9). The oil surface located below the closed portion (9) is not directly affected by the wind pressure of the suction gas.

Therefore, it is possible to prevent the oil surface from foaming due to the oil pressure being disturbed by the wind pressure of the suction gas, and as a result, the conventionally generated foaming oil foam is further stirred by the balance weight (8). It is also possible to prevent the oil from flowing into the compression element (2) along with the intake gas.
It is possible to prevent the oil from being sucked into the oil, and to prevent the oil from rising to that extent. It is also possible to prevent an increase in the input of the motor (5), and it is possible to prevent oil bubbles from being mixed into the lubricating oil that feeds each lubrication point. However, poor lubrication does not occur.

Further, since the shielding portion (9) has an outer diameter corresponding to the rotation locus drawn by the radial outermost portion of the balance weight (8), after mounting the motor (5) on the casing (1),
When the air gap is measured, the shielding portion (9) can be satisfactorily performed without interfering with the measurement.

[Brief description of drawings]

FIG. 1 is a sectional view of a scroll type fluid machine according to the present invention, FIG. 2 is a plan view of a lower housing, FIG. 3 is a bottom view of the same, and FIG. 4 is a sectional view showing a conventional example. (1) …… Casing (2) …… Compression element (3) …… Upper housing (4) …… Drive shaft (5) …… Motor (6) …… Lower housing (7) …… Oil sump (8) …… Balance weight (9) …… Blocking part (23) …… First scroll (26) …… Second scroll (51) …… Rotor

Claims (1)

(57) [Claims] 1. A casing (1) is provided with a compression element (2) having first and second scrolls (23) (26) on an upper part thereof, and a drive shaft (4) for driving the compression element (2) on a lower part thereof. A motor (5) having a built-in motor is installed, an upper housing (3) and a lower housing (6) for supporting the drive shaft (4) are provided, and an oil sump (7) is provided under the casing (1). On the other hand, in a scroll type fluid machine in which a balance weight (8) is provided on a lower surface of a rotor (51) of the motor (5), the balance weight (8) is provided at an outermost portion in a radial direction on an upper portion of the lower housing (6). A shielding part (9) having an outer diameter that responds to the rotation trajectory drawn by and facing the lower surface of the rotor (51) is provided, and the upper surface of the shielding part (9) is provided with the balance weight (8). It is characterized by being close to the bottom surface of Crawl type fluid machine.