JPS6390695A - Scroll type hydraulic machine - Google Patents

Abstract

PURPOSE:To improve sealing property by disposing the outer wall of a lower housing close to the inner surface of a casing to form an opposed wall having the length of a seal around an intake hole in the outer wall. CONSTITUTION:An inner wall 62 is provided in the outer wall 61 of a lower housing 6 opposed to a position of mounting an intake pipe 10 attached to a casing 1 to form an intake path 11. The outer wall 61 is provided with an intake hole 63 and placed close to the inner surface of the casing 1, while an opposed wall 64 having the length of seal measured from the edge of intake hole 63 is provided connectively to the outer wall 61. Thus, the intake pipe 10 can be simply connected and the sealing property of outer wall 61 and casing 1 is improved.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a scroll-type fluid machine, and more particularly, to a scroll-type fluid machine in which a lower housing having a lower bearing for supporting a drive shaft of a motor is disposed at the lower part of a casing. Regarding fluid machinery.

(Prior Art) Conventionally, this type of scroll-type fluid machine is described in, for example, U.S. Pat. No. 4,389,171, and as shown in FIG. 6, a fixed and revolving scroll ( X2) (X3) into the upper housing (
x4), while below, the motor (XG)
and a lower housing (X
[i) (x9) is placed.

In addition, the lower housing (XG) has a casing (Xl
A suction pipe (XIO) is connected through the wall of the housing (XIO), and the gas introduced from the suction pipe (XIO) is passed through the wall of the
G) is introduced through the air gap (XG) of the motor (x5) so that the motor (x5) can be cooled, and the gas introduced from the suction pipe (xlo) is introduced into the casing (XI). This prevents problems such as oil coming into contact with the oil in the bottom oil sump (XA) and being lifted upwards, causing oil to come out.In addition, the motor (X5) is sufficiently cooled to improve reliability. ing.

However, as mentioned above, in order to connect the suction pipe (XIO) to the lower housing (x6) by penetrating the wall surface of the casing (Xl), the suction pipe connection position on the lower housing (X8) side and the casing ( The positions of the through holes on the XI) side must match, and the connections such as welding and sealing on the lower housing (x6) side and the same connections and sealing such as welding on the casing (XI) side. Processing is required, which not only complicates the structure, but also makes it extremely difficult to assemble.

Therefore, in the patent application (Japanese Unexamined Patent Publication No. 80-254255) dated November 12, 1985, the present applicant proposed an opening ( We have proposed a configuration in which the end face of YB2) and the inner wall of the casing (Yl) are arranged in sealing contact, and the suction pipe (YIG) is simply connected to the wall of the casing (Yl).

(Problem to be Solved by the Invention) However, in the case shown in Fig. 7, for example, the lower housing (
The end face of the opening (YEi3) and the inner wall of the casing (Yl) are difficult to assemble due to the influence of accuracy and machining accuracy of these (Y8) and casing (Yl) as single items. There is a possibility that the sealing performance between the intake pipe (YIO) may be incomplete, and the gas introduced from the suction pipe (YIO) may leak into the internal space of the casing (Yl).

For this purpose, the introduced gas from the suction pipe (YIO) is guided upward from the bottom of the motor via the lower housing (Y[i) to cool the motor, and the introduced gas and the casing (Y The effect of preventing contact with oil in the internal space of the tank may be insufficient.

An object of the present invention is to simplify the connection of the suction pipe, improve the sealing performance between the outer wall of the lower housing and the inner wall of the casing, improve motor cooling, and reduce the amount of introduced gas and oil. An object of the present invention is to provide a scroll-type fluid machine that can minimize contact contamination.

(Means for solving the problem) Therefore, the present invention provides a motor (
A scroll-type fluid machine is provided with a lower housing (6) having a lower bearing (9) that supports a drive shaft (7) of the casing (1).
), an inner wall (62) is provided inside the outer wall (61) of the lower housing (6), and the suction passage (11
), and a suction hole (63) is provided in the outer wall (61) facing the opening of the suction pipe (10) in the casing (1), so that the outer wall' (81) is connected to the casing (1). ), while the outer wall (6
1) is characterized in that an opposing wall (64) whose seal length is the length from the edge of the suction hole (63) is provided in succession.

(Function) The outer wall (El 1 ) and the inner surface of the casing (1) are arranged close to each other, and a predetermined seal length is formed around the suction hole (63) in the outer wall (61). The suction pipe (10
) from the suction hole (63) to the suction passage (11).
This prevents the suction gas introduced into the lower part of the motor (5) from dancing into the inside of the casing (1).
It can be reduced to a minimum.

(Example) FIG. 1 shows a scroll-type fluid machine according to the present invention, in which a dome-shaped sealed casing (1) has a
A fixed scroll (2) and a revolving scroll (3) are arranged, while a stator (51) and a rotor (5) are arranged at a lower position.
2), and the revolving scroll (3) and the motor (5) are interlocked via a drive shaft (7).

The upper part of the drive shaft (7) is supported by an upper housing (4) with an upper bearing (8), and the lower part of the drive shaft (7) is supported by a lower housing (8) with a lower bearing (9). has been done.

The rotation of the drive shaft (7) is controlled by a balance weight part (14) integrally formed on the upper end of the drive shaft (7) and a drive bin (1) attached to the balance weight part (14).
5) and an Oldham ring (17) that constitutes an anti-rotation mechanism, the signal is transmitted to the revolving scroll (3), and connects the revolving scroll (3) to the fixed scroll. (2) is driven to revolve around the scrolls (2) and (3), so that a compressible fluid such as a refrigerant is compressed between these scrolls (2) and (3).

On the other hand, an oil supply passage (7a) extending in the axial direction is formed inside the drive shaft (7), and the lower part of this oil supply passage (7a) faces an oil reservoir (A) provided at the bottom of the casing (1). Then, the oil pumped up from the oil reservoir (A) through the oil supply passage (7a) is delivered to each of the bearings (8), (9) and T! , and
The swing link (18), Oldham ring (17)
It is like lubricating the driving parts such as.

In the scroll-type fluid machine configured as described above, the outer wall of the lower housing (6) faces the attachment position of the suction pipe (10) attached to the casing (1) via the pipe joint (10a). (6I) Inwardly the inner wall (6
2) to form a suction passage (11), and a suction hole (63) is provided in the outer wall (61) facing the opening of the suction pipe (10) in the casing (1) to form a suction passage (11). 61) is placed close to the inner surface of the casing (1), while the suction hole (63) is placed in the outer wall (61).
An opposing wall (64) whose seal length is the length from the edge of the hole is provided in series.

Specifically, as shown in FIGS. 2 to 5, the outer wall (
61) is the casing (1) to which the suction pipe (10) is connected.
), the partial cylindrical surface (Ilila) of the outer wall (61) and the cylindrical inner wall surface of the casing (1) are arranged in close proximity; At the top of the outer wall (61), the suction pipe (1
A suction hole (63) communicating with the outer wall (6
1) and an inner wall (62) provided inwardly of the outer wall (61).
3) radially inward from the hole edge to the specified seal length L)
A facing wall (64) having a diameter is connected to the upper part of the outer u (+31).

Further, a generally fan-shaped suction chamber (12) communicating with the suction passage (11) is provided at the bottom of the lower housing (6).
is formed so that the suction gas downstream of the suction passageway (11) is biased upward, and the chamber (11) is
2) Messi in the upper position! A cane filter (13) is inserted to separate and remove impurities such as dust contained in the intake gas.

The bottom of the chamber (12) is provided with a thin plate-like closing lid (60) that is crimped to the bottom of the lower housing (6).
It is closed.

Thus, the partial cylindrical surface (Eila) of said outer wall (61)
and the cylindrical inner wall surface of the casing (1) are arranged in close proximity to each other, and have a predetermined seal length L) around the suction hole (63) in the outer wall (61). By forming the wall (64), it is possible to reduce the amount of suction gas introduced into the suction passage (11) from the suction pipe (10) from entering the internal space of the casing (1). be.

Moreover, the suction pipe (10) is simply connected to the casing (
Since it is only necessary to connect to 1), the structure can be simplified and the ease of assembly can be improved compared to a structure in which the suction pipe is inserted into the casing and connected to the lower housing.

Further, as shown by the arrow in FIG. 1, the suction passage (11
) is deflected upward in the chamber (12) and passes through the filter (13).
The air gap (G) between the stator (51) and rotor (52) of the motor (5) is raised. The motor (5) will be cooled.

On the other hand, at this time, impurities such as dust contained in the suction gas are removed by the biased flow in the direction of flow of the suction gas by the suction passage (11) and the suction chamber (12), and by the filtration of the filter (13). This ensures that the particles are separated and removed at the bottom of the chamber (12).

The suction gas that has passed through the motor (5) passes through a through hole (40) formed in the upper housing (4).
The fixed scroll (2) and the revolving scroll (3) reach the suction bow (23), and the scroll (2) (
3) and is compressed through the discharge hole (20) and discharge valve (21).
, the discharge chamber (22), and the external discharge pipe (100).

(Effects of the Invention) As described above, the present invention provides a scroll in which a lower housing (6) having a lower bearing (9) for supporting a drive shaft (7) of a motor (5) is disposed in a lower part of a casing (1). type fluid machine, the lower housing (6) facing the attachment position of the suction pipe (10) attached to the casing (1).
) is provided with an inner wall (62) inside the outer wall (61) to form a suction passage (11), and the outer wall (61) faces the opening of the suction pipe (10) in the casing (1).
) is provided with a suction hole (63), and the outer wall (61) is brought close to the inner surface of the casing (1). Since it is characterized by continuous facing walls (64) having a sealing length of
) and the inner wall of the casing (1), the motor (5) can be cooled well, and the introduced gas and the oil inside the casing (1) can be improved. This allows contact with and contamination to be minimized.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a scroll compressor according to the present invention;
Figure 2 is a top view of the lower housing, Figure 3 is a side view of the lower housing, Figure 4 is a bottom view of the lower housing,
FIG. 5 is a sectional view taken along the line XX in FIG. 2, FIG. 6 is a drawing explaining a conventional example, and FIG. 7 is a drawing explaining a prior art. (1)...Casing (5)...Motor (6)...Lower housing (7)...Drive shaft (9)...Lower bearing (10)... Suction pipe (11)...Suction passage (61)...Outer wall (62)...Inner wall (63)...Suction hole (64)...Opposing wall/J 12 2nd Figure j 6/ Figure 4

Claims (1)

[Claims] (1) A scroll-type fluid machine in which a lower housing (6) having a lower bearing (9) that supports a drive shaft (7) of a motor (5) is disposed at the lower part of a casing (1),
an outer wall (61) of the lower housing (6) facing the attachment position of the suction pipe (10) attached to the casing (1);
) An inner wall (62) is provided inward to form a suction passage (11), and a suction pipe (1) in the casing (1) is formed.
A suction hole (6
3) to connect the outer wall (61) to the casing (
1), and further includes an opposing wall (64) connected to the outer wall (61) and having a sealing length equal to the length from the edge of the suction hole (63). Fluid machinery.