JPH0765575B2 - Scroll type fluid machine - Google Patents

Description

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

(Prior Art) Conventionally, this type of scroll type fluid machine is disclosed in, for example, Japanese Patent Laid-Open No.
No. 73083, and as shown in FIG. 5, a fixed scroll (2) and an orbiting scroll (3) are supported via an upper housing (4) on the upper inner side of a closed casing (1). And supporting the motor (5) and the lower housing (6) below the casing (1) and bearing (8a) of the upper housing (4).
The bearing (8b) of the lower housing (6) rotatably supports the drive shaft (7) of the revolution scroll (3).

Further, a suction pipe (11) is connected to an intermediate portion in the vertical direction of the casing (1), and the suction pipe (11) is opened to an internal space (A) of the casing (1) to provide the internal space. The terminal (50) to the motor (5) is connected to the casing (1) while sucking the intake gas of (A).
It is attached to the outer wall of the suction pipe (11) on the opposite side of the connection position.

Then, the suction gas sucked into the space (A) is provided in the upper housing (4) and through a suction passage (90) provided in the suction pipe (11) near the opening,
The scrolls (2) and (3) are guided to the suction ports.

In addition, (13) is the oil after being lubricated by lubricating the sliding contact portions of the scrolls (2) and (3) with the casing (1).
Is a return passage for returning to an oil sump provided at the bottom of the container and is open to the internal space (A).

(Problems to be Solved by the Invention) As described above, the conventional terminal (50) is attached to the casing (1) on the side opposite to the connection position of the suction pipe (11) and the suction pipe ( The suction gas sucked from 11) into the internal space (A) of the casing (1) flows through the suction passage (90) to the suction port of the scroll (2) (3). Although the terminal of the terminal (50) is exposed to the atmosphere filled with the intake gas, there is almost no flow of the intake gas around the terminal, so that the terminal (50) is
There was a problem that it could not be cooled sufficiently.

Therefore, in the related art, the terminal (50) needs to have a large terminal capacitance, which causes a problem of cost increase.

Further, since the suction gas refrigerant and the lubricating oil are mixed in the internal space (A), metal powder or the like mixed in the lubricating oil adheres to the terminal (50) to cause insulation failure. There was also a problem in terms of reliability.

An object of the present invention is to positively cool a terminal of a motor to reduce the terminal capacity of the terminal and prevent insulation failure in the terminal, thereby achieving cost reduction and improved reliability. Form fluid machine.

(Means for Solving Problems) Therefore, in order to solve the above problems, the present invention incorporates a fixed scroll (2) and an orbiting scroll (3) on one side of a casing (1), and others. On the side, in the scroll type fluid machine in which the motor (5) is installed, a plurality of core cut portions are provided in the outer peripheral portion of the motor (5), leaving a protruding portion that contacts the inner surface of the casing (1). Between a part of the core cut portion and the casing (1),
An intake passage (9) for flowing an intake fluid is formed in the axial direction of the motor (5), and an oil return passage (13) is formed between the other core cut portion and the casing (1). The terminal (50) of the lead wire of the motor (5) faces the suction passage (9).

(Operation) By the solution means, the suction passage (9) having a predetermined flow path along the axial direction of the motor (5) is formed inside the casing (1) by utilizing the core cut portion of the motor (5). You can
By passing the suction fluid through the suction passage (9) along the axial direction of the motor (5), the low-temperature suction fluid is applied to the terminal (50) of the lead wire of the motor (5) at a relatively high flow velocity. It is possible to always positively cool the terminal (50) and, moreover, it is possible to constantly apply the suction fluid having a relatively high flow rate to the terminal (50) through the suction passage (9). In addition, the suction flow passage (9) is separated from the oil return passage (13) having a different core cut portion, and metal powder mixed in oil adheres to the terminal (50). Insulation failure can be prevented in advance, and the overall reliability can be improved while the terminal (50) can be cooled effectively.

(Example) Hereinafter, a scroll type fluid machine according to the present invention will be described with reference to an example of the drawings.

FIG. 1 shows an overall structure of a vertical scroll type fluid machine, and FIG. 2 shows a partially omitted sectional view taken along line ZZ of FIG. 1, showing a cylindrical body (1a) and the body (1a). ) One side and the other side, that is, the upper and lower portions, the lids (1b) and (1c) are fitted in an airtight manner to form a closed casing (1), and the casing (1) is located at an upper position on one side inside. , The fixed scroll (2) and the orbiting scroll (3) are supported via the upper first housing (4), and at the lower position on the other side of the casing (1), the stator (51) and the rotor (52). And a lower second housing (6), and a drive shaft (7) extending in the up-down direction in each of the housings (4) and (6) is provided with a bearing (8a). ) (8b) rotatably supported in a cantilevered manner, while one side upper part of the drive shaft (7) is supported by the revolution scroll. And the lower part of the other side is respectively connected to the motor (5), and the revolution scroll (3) is driven by the rotational driving of the drive shaft (7) accompanying the motor (5). The fixed scroll (2) is driven to revolve, and the refrigerant is compressed between the fixed scroll (2) and the revolving scroll (3).

The motor (5) is attached to the outer peripheral portion of the motor (5).
Oil return passage (13) facing from one side to the other side in the axial direction
A suction passage (9) is formed separately from the suction passage (9), and a terminal (50) to the motor (5) is provided in the suction passage (9).
To face.

Specifically, as shown in FIG. 3, the body (1a) of the casing (1) is attached to the outer periphery of the stator (51) of the motor (5).
4 core cut parts are provided leaving four projecting parts (51a) having a circular outer surface facing each other, and no one space (9a) is provided between the one core cut part and the body (1a). hand,
A suction pipe (11) is connected to the first space (9a), and two adjacent spaces (9b) and (9b) are connected to the first space (9a) as described below, and these 3 The space (9a) (9b) (9b) consisting of two core cut portions is used as the suction passage (9), and the core cut portion and the body (1a) facing the first space (9a) are used. The second space (1
0), the second space (10) is connected to the oil return passageway (1
It is used as 3).

That is, through holes (6a) and notches (6b) and (6b) are formed in the outer peripheral rising wall of the lower housing (6) at positions facing the space (9a) and the spaces (9b) and (9b), respectively. The space (9a) and the spaces (9b) (9b) through a lower space (12) formed between the lower part of the motor (5) and the bottom wall of the lower housing (6). To do.

As a result, the refrigerant sucked into the space (9a) from the suction pipe (11) is guided to the lower space (12) through the through hole (6a), and is guided from the lower portion of the motor (5) to the lower space (12). The air gap (5a) formed between the stator (51) and the rotor (52) of the motor (5) and the notch (6b) of the lower housing (6) upward through the spaces (9b). The motor (5) is cooled when the refrigerant is guided and passes through the spaces (9b), the air gap (5a) of the motor (5) and the space (9a).

At this time, the lower part of the space (9a) (9b) (9b) (12) is separated from the oil sump (a) provided at the bottom of the casing (1) by the bottom wall of the lower housing (6). It will be quarantined.

Then, as shown in FIG. 4, the upper part of the space (9a) is closed by the upper housing (4), and a plurality of parts are provided in the upper housing (4) at positions facing the spaces (9b) and (9b). Of the fixed scroll (2) and the revolving scroll (3) by sucking the refrigerant that forms the through hole (4a) of the fixed scroll (2) and the space (9b) (9b) through the through hole (4a). They are supposed to guide you to the port.

Thus, from the first space (9a) to the lower space (12)
A series of suction passages (9) from the space (9b) (9b) to the through hole (4a) are formed, and the suction passage (9) thus formed. The terminal (50) of the motor (5) is attached to a position above the space (9b) in, and the lead wire (55) from the motor (5) is connected to the terminal of the terminal (50). Is there.

On the other hand, the second space (10) is pumped up from an oil supply passage (7a) extending in the axial direction of the drive shaft (7), and the drive shaft (7) and the bearing (8a) of the upper housing (4). ) Is used as an oil return passage for recirculating the lower oil sump (a) of the casing (1).

That is, as shown in FIG. 1, a horizontal passage (13a) is formed in the housing (4), and the housing (4) is provided between the casing (1) and the upper housing (4). A vertical passage (13b) is formed at a position facing the second space (10), and a vertical passage is formed at a position facing the second space (10) of the lower housing (6). (13c) to form these passages (13a) (13
b), the second space (10) and the passage (13c) form the oil return passage (13), and the lubricating oil is supplied from the upper part of the housing (4) through the passage (13b). It is configured such that it is guided to the second space (10) as indicated by the dotted line arrow in FIG. 1, and is guided to the oil sump (a) of the casing (1) through the second space (10).

In the embodiment shown in the drawings, a counter weight (14) is attached to a lower position of the drive shaft (7) facing the orbiting scroll (3), and a drive pin (15a) is mounted on the counter weight (14). And limit pin (15b)
A swing link (16) having a balance weight (16a) is attached to the boss (3a) of the revolution scroll (3) at a position eccentric to the drive shaft (7) of the swing link (16). While supporting the bearing of the Oldham ring (1), the Oldham ring (17) is interposed between the swing link (16) and the revolution scroll (3).
By 7), the revolution scroll (3) is driven to revolve.

Further, reference numeral (18) in the drawing denotes a refrigerant discharge pipe connected to the upper position of the casing (1).

With the above structure, the suction fluid passes through the space (9b) forming the suction passage (9) along the axial direction of the motor (5), so that the low temperature suction fluid is relatively discharged to the terminal (50). It can be applied at a high flow rate, and the terminal (50) can be actively cooled at all times. Moreover, in this way, it is possible to constantly apply an intake fluid having a relatively high flow rate to the terminal (50), and Combined with the fact that the passage (9) is separated from the oil return passage (13), it is possible to prevent the metal powder mixed in the oil from adhering to the terminal (50) and causing insulation failure. Of.

Further, the space (12) is formed below the motor (5), and a part of the suction gas is discharged from the space (12) to the motor (5).
The motor (5) can also be positively cooled by guiding it upward through the air gap (5a).

Although the terminal (50) is provided above the space (9b) in the above embodiment, it may be provided below the space (9a).

That is, in this case, the terminal (50) is provided between the connection position of the suction pipe (11) in the space (9a) and the opening facing surface position of the through hole (6a).

Further, in the above-mentioned embodiment, the vertical type is shown, and the suction passage (9) formed in the vertical direction of the casing (1) is
Although the terminal (50) is provided, the terminal (50) may be faced to the suction passage formed in the left-right direction, such as a horizontal type.

(Effects of the Invention) As described above, according to the present invention, the suction passage (having a predetermined flow path along the axial direction of the motor (5) is provided inside the casing (1) by utilizing the core cut portion of the motor (5). 9) can be formed,
By passing the suction fluid through the suction passage (9) along the axial direction of the motor (5), the low-temperature suction fluid is applied to the terminal (50) of the lead wire of the motor (5) at a relatively high flow velocity. It is possible to always positively cool the terminal (50) and, moreover, it is possible to constantly apply the suction fluid having a relatively high flow rate to the terminal (50) through the suction passage (9). In addition, the suction flow passage (9) is separated from the oil return passage (13) having a different core cut portion, and metal powder mixed in oil adheres to the terminal (50). Insulation failure can be prevented in advance, and the overall reliability can be improved while the terminal (50) can be cooled effectively. In this way, heat generation at the terminals of the terminal (50) can be suppressed, the terminal capacitance can be reduced, the terminal (50) can be downsized, and the cost can be reduced.

[Brief description of drawings]

1 is a longitudinal sectional view of a scroll type fluid machine according to the present invention, FIG. 2 is a partially omitted sectional view taken along line ZZ of FIG. 1, and FIG.
The figure is a partially omitted cross-sectional view taken along line X-X in FIG. 1, and FIG.
FIG. 5 is a cross-sectional view of only the first housing taken along line Y, and FIG. 5 is a drawing showing a conventional example. (1) …… Casing (2) …… Fixed scroll (3) …… Orbital scroll (4) …… First housing (5) …… Motor (6) …… Second housing (7) …… Drive shaft ( 8a) …… First bearing (8b) …… Second bearing (9) …… Suction passage (13) …… Oil return passage (50) …… Terminal

Claims (1)

[Claims] 1. A fixed scroll (2) and an orbiting scroll (3) are mounted on one side of a casing (1), and the other side is mounted on the other side.
In a scroll type fluid machine in which a motor (5) is installed, a plurality of core cut portions are provided on an outer peripheral portion of the motor (5), leaving a protruding portion that is in contact with an inner surface of the casing (1). An intake passage (9) for flowing an intake fluid in the axial direction of the motor (5) is formed between the core cut portion of the casing (1) and the core cut portion of the casing (1). Oil return passage between (1
A scroll type fluid machine characterized in that the terminal (50) of the lead wire of the motor (5) is made to face the suction passage (9) while forming 3).