JP2830615B2 - Centrifugal oil separator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal oil separator for centrifuging lubricating oil contained in a gaseous refrigerant discharged from a compressor.

[0002]

2. Description of the Related Art As described in Japanese Patent Publication No. 47-2949, for example, a centrifugal oil separator for centrifuging lubricating oil contained in a gas-phase refrigerant discharged from a compressor is known. .

[0003] As shown in FIG.
An outlet pipe (b) is provided at the upper part of the container body (a), an oil return pipe (c) is provided at the lower part, and an inlet pipe (d) is connected in a substantially tangential direction at the upper part of the container body (a). I have. And
By rotating the gas-phase refrigerant and the oil at high speed in the container body (a), the oil having a larger mass than the gas-phase refrigerant is centrifugally forced to move the oil in the container body (a) as shown by the arrow in FIG. ) Is separated by pressing against the inner wall surface, and the separated oil is transmitted along the wall surface by gravity and accumulates in the lower part of the container body (a), and returns to the suction side by utilizing the pressure difference through the oil return pipe (c). ing.

[0004]

SUMMARY OF THE INVENTION In such a case,
As shown in detail in FIG. 23, an annular oil film (e) flows along the wall surface of the inlet pipe (d), and a mixture (f) of refrigerant gas and mist-like oil flows inside the annular oil film (e). It will be.

However, when they flow into the container body (a) through the inlet pipe (d), the inlet pipe (d) is connected so as to coincide with the tangential direction of the container body (a). At the outer contact portion S1 on the wall surface side of the main body (a), the annular oil film (e) flows along the wall surface, but near the inner contact portion S2, the inflow direction is not clearly determined, and the flow is disturbed. It made the separation of the compound difficult.

[0006] The present invention has been made in view of the above point, and an object of the present invention is to provide a centrifugal oil separator having improved oil separation efficiency.

[0007]

According to the present invention, an outlet pipe (3) is provided at an upper portion of a container body (2), and an oil return pipe (4) is provided at a lower portion.
Are respectively connected, and inlet pipes (5A) and (5B) are connected in a substantially tangential direction at an upper portion of the container body (2) to rotate the gas-phase refrigerant and oil at a high speed in the container body (2). Accordingly, a centrifugal oil separator (1A) that separates oil by pressing against the inner wall surface of the container body (2) with centrifugal force is assumed.

The invention according to claim 1 is characterized in that the inlet pipe (5A) is provided.
Is formed in a double-pipe structure composed of an inner pipe (6A) and an outer pipe (7), and is located near the center of the outer pipe (7) at the inlet of the inner pipe (6A). At the connection portion with the main body (2), the container is deviated toward the center of the container main body (2) and is in contact with the outer pipe (7).

The invention according to claim 2 is the invention according to claim 1, wherein the inner pipe (6)
Instead of A), the inlet portion (6c) has a circular cross section located near the center of the outer tube (7), and the outer tube (6d) near the outlet portion (6d) connected to the container body (2). An inlet pipe (5B) having an inner pipe (6B) having a diameter substantially the same as that of 7) and having a partially oval cross-sectional shape in which a part near the wall surface of the container body (2) is missing.

According to a third aspect of the present invention, in place of the inlet pipe (5A) having the double pipe structure of the first aspect, the inlet portion (5a) has a substantially circular cross section, and the cross section gradually increases toward the outlet portion. The outlet portion (5b) changes to an elliptical shape, and has a flat cross-sectional elliptical shape.
One central axis and is parallel inlet pipe (5C) is used
On the other hand, the container body (2) has an oil-repellent fluororesin core
A tinting layer (11) is formed.

According to a fourth aspect of the present invention, the inlet pipe (5C) has a substantially constant cross-sectional area.

According to a fifth aspect of the present invention, the container body (2) has an oil-repellent fluororesin coating layer (11) formed on the inner wall surface.

According to a sixth aspect of the present invention, the outlet pipe (3A) has a protruding portion (3a) protruding into the container body (2), and the protruding portion (3a) is provided on the inner wall surface of the container body (2). At a distance from (2a), the mesh member (15) is substantially perpendicular to the flow blown out from the inlet pipes (5A) to (5D).
Is provided.

[0014]

According to the first aspect of the present invention, the inner pipe (6A) of the inlet pipe (5A) is located substantially at the center of the outer pipe (7) at the inlet portion, and at the connection portion with the container body (2). Since it is displaced toward the center of the container body (2) and contacts the outer tube (7), the contact portion between the inner tube (6) and the outer tube (7) is located at the inner contact portion S2, and as a result, the annular shape The oil film is guided toward the wall surface of the oil separator vessel (1) (toward the outer contact portion S1), while the mixture of the refrigerant gas and the mist oil flows into the inner contact portion S1.
Guided to the second side, the annular oil film descends along the wall surface of the container body (2).

According to the second aspect of the present invention, the inlet pipe (5B)
The inner pipe (6B) has a portion near the central axis of the container body (2) cut off near the connection with the container body (2), so that the entire annular oil film is formed on the wall surface side of the container body (2). The refrigerant gas and the mist-like oil are guided toward the axial center of the container body (2).

According to the third aspect of the present invention, the inlet pipe (5C)
The outlet portion (5b) has a flat elliptical cross section and its major radius direction is parallel to the central axis of the container body (2), so that the flow of the annular oil film flows toward the wall surface of the container body (2). Actively guided. The container body (2) has an inner wall.
An oil-repellent fluororesin coating layer (11) is formed on the surface.
Is separated and adheres to the wall of the container body (2).
The oil adheres to the wall of the container body (2) due to its oil repellency.
Large oil particles (12) in a nearly spherical shape are small oil particles
(13) to form a larger spherical oil particle (1).
4) While gradually growing, move to the lower side of the container body (2).
Move.

According to the invention of claim 4, the inlet pipe (5C)
Since the cross-sectional area is substantially constant, the flow velocity is substantially constant.

According to the invention of claim 5, the container body (2)
Is an oil-repellent fluororesin coating layer (1
Due to the formation of (1), the oil separated and adhered to the wall surface of the container body (2) is oil-repellent, so that large oil particles (12) having a nearly spherical shape adhered to the wall surface of the container body (2). )
Agglomerates the small oil particles (13) and gradually grows into larger spherical oil particles (14) while the container body (2)
Move down.

According to the invention of claim 6, the inlet pipe (5A)
Since the mesh member (15) is provided so as to be substantially perpendicular to the flow direction of the swirling flow blown out from (5D), the mist-like oil adheres and condenses when the mesh member (15) passes through the mesh. To increase the particle size and increase the mass. Thereby, the performance of separating oil by centrifugal force is enhanced. Since the mesh member (15) is provided at a distance from the inner wall surface (2a) of the container body (2), it affects the flow of the annular oil film (16) flowing along the inner wall surface (2a). Absent.

[0020]

Embodiments of the present invention will be described below in detail with reference to the drawings.

Example 1 In FIGS. 1 and 2, (1) is a centrifugal oil separator, and an outlet pipe (3) is provided at an upper part of a container body (2), and an oil return pipe (4) is provided at a lower part. Are respectively arranged, and an inlet pipe (5A) is connected to the upper part of the container body (2) in a substantially tangential direction. Then, by rotating the gas-phase refrigerant and the oil at high speed in the container body (2), the oil is separated by pressing against the inner wall surface of the container body (2) using centrifugal force.
As shown in detail in FIGS. 3 and 4, the inlet pipe (5A) is formed in a double pipe structure composed of an inner pipe (6A) having a circular cross section and an outer pipe (7). ) Is located near the center of the inlet portion (7a) of the outer tube (7), while the connection portion (6) with the container body (2) is located.
b) is bent toward the center of the container body (2) so as to be deviated as a whole, and is in contact with the center side of the outlet portion (7b) of the outer tube (7). That is, since the inner pipe (6) is located substantially at the center of the outer pipe (7) at the inlet portion of the inlet pipe (5A), the annular oil film is formed between the inner pipe (6A) and the outer pipe (7). Flows through the annular passage portion (8A). Then, the inlet pipe (5
In the middle of A), the inner pipe (6A) is bent near the center of the container body (2), and the outer peripheral surface of the inner pipe (6A) approaches the inner peripheral surface of the outer pipe (7), and the outlet portion (6b) comes into contact with the outlet portion (7b) of the outer pipe (7), and guides the annular oil film toward the wall surface of the container body (2).

With the above construction, the inner pipe (6A)
The contact area between the outer pipe (7) and the outer pipe (7) becomes the inner contact portion S2, so that the so-called annular oil film flowing through the annular passage section (8A) between the pipes (6A) and (7) is separated from the oil separator vessel (1) The mixture of the refrigerant gas and the mist-like oil flowing into the container body (2) along the wall direction (outer contact portion S1 side) and flowing through the inner pipe (6A) is guided to the inner contact portion S2 side. I will be able to be. As a result, internal turbulence that causes a reduction in separation efficiency due to a so-called annular oil film is prevented, and the annular oil film descends along the wall surface of the container body (2).

In the first embodiment, the inner pipe (6A) is made eccentric near the outlet of the inlet pipe (5A) with respect to the outer pipe (7). As shown, the cross-sectional shape of the outlet part of the inner pipe in the inlet pipe may be made into a partially circular shape.

Embodiment 2 As shown in FIGS. 5 to 7, instead of the inner pipe (6A) of the first embodiment, the inlet portion (6c) is substantially the same as the inlet portion (7a) of the outer pipe (7). The outlet section (6d) connected to the container body (2) has a circular cross section located near the center, has a diameter substantially the same as that of the outer pipe (7), and is close to the inner wall surface of the container body (2). An inner tube (6B) having a cross section with a missing portion is used.

At the outlet part of the inlet pipe (5B), the contact area between the outer peripheral surface of the outlet part (6d) of the inner pipe (6B) and the inner peripheral surface of the outlet part (7b) of the outer pipe (6B). However, it is considerably larger than the inlet pipe (5A) of the first embodiment (see FIG. 6), and the passage (8B) between the two pipes (6B) and (7) is formed into an annular oil film at the inlet portion. The outlet portion has a substantially semicircular shape located on the inner wall surface side of the container main body (2), and collects all of the annular oil film on the inner wall surface side of the container main body (2) while the inner pipe ( The mixture of the refrigerant gas and the mist-like oil flowing inside 6B) is guided toward the axial center of the container body (2). This makes it possible to suppress internal turbulence that causes a reduction in separation efficiency due to a so-called annular oil film, and the annular oil film flows downward along the wall surface of the container body (2).

The inlet pipes (5A) and (5B) do not have a double pipe structure as in the first and second embodiments. A similar effect can be obtained by changing it.

Example 3 As shown in FIGS. 8 to 13, as in the case of Examples 1 and 2, an outlet pipe () is provided at the upper part of the vessel main body (2) of the centrifugal oil separator (1 B). 3), an oil return pipe (4) is provided at a lower portion, and an inlet pipe (5C) having a cross-sectional shape that changes in a substantially tangential direction at an upper portion of the container body (2) is connected (FIG. 1).
0 and FIG. 11). The inlet pipe (5C) is
a) is a substantially circular cross-sectional shape (see FIG. 12), and in the middle part, the long radius direction changes to a flat elliptical shape parallel to the central axis of the container body (2), and the outlet part (5b) is also the same. It has a flat elliptical shape (see FIG. 13), and its cross-sectional area is substantially constant so that the flow velocity does not change.

As a result, the annular oil film formed on the inner peripheral surface of the inlet portion (5a) of the inlet pipe (5C) is
While flowing through the inside of C) toward the outlet portion (5b), it is actively guided to the inner wall surface side of the container body (2) and flows along the inner wall surface of the container body (2). The internal turbulence due to the annular oil film is suppressed, and the separation performance is enhanced by centrifugal force.

In the above-mentioned container body (2), as shown in FIG. 14, the oil (9) once separated and accumulated on the inner wall surface of the container body (2) adheres uniformly. Therefore, the gas in the container body (2) rotating at a high speed may be scattered again, resulting in a decrease in separation efficiency.
As shown in FIG. 5, the fluororesin coating layer (11) may be formed by performing an oil-repellent fluororesin coating treatment on the inner wall surface of the container body (2).

With this arrangement, the oil separated on the wall surface of the container body (2) has the oil repellency of the fluororesin coating layer (11), and as shown in FIGS. The large oil particles (12) (centrifugal force F1) that adhere to the inner wall surface of 2) in a nearly spherical state become small oil particles (13).
Coagulate and move downward while growing into larger spherical oil particles (14). The oil particles (14), which have grown and increased in mass due to large growth, have a higher centrifugal force F2 on the side wall side.
(> F1), and in addition, large oil particles (14) are not opposed to the flow of the swirling airflow on the wall surface due to the effect of lowering the frictional resistance due to the oil repellency of the fluororesin coating layer (11). Then, it slides down toward the lower part of the container body (2). As a result, re-scattering is prevented.

Embodiment 4 As shown in FIGS. 18 and 19, as in Embodiments 1, 2 and 3, an outlet is provided at the upper part of the vessel main body (2) of the centrifugal oil separator (1C). The pipe (3A) has an oil return pipe (4
A) are provided, and an inlet pipe (5D) having a cross-sectional shape that changes in a substantially tangential direction at an upper portion of the container body (2) is connected. A mesh member (15) extending radially outward is attached to the projecting portion (3a) of the outlet pipe (3A) projecting into the container body (2) at intervals of 90 degrees. That is,
The mesh member (15) is provided so as to be substantially perpendicular to the flow direction of the swirling flow blown out from the inlet pipe (5D). Further, the mesh member (15) is provided in the container body (2).
Because it is provided at an interval from the inner wall surface (2a) of
It does not affect the flow of the annular oil film (16) flowing along the inner wall surface (2a) (see FIG. 20). Incidentally, (17) is a hopper member whose radius becomes smaller toward the lower side, and (18) is an oil sump formed at the lower portion of the container body (2).

As a result, the mist-like oil contained in the gas adheres and condenses when passing through the mesh of the mesh member (15), and the particle diameter, that is, the mass is increased by the bonding of the particles, whereby the centrifugal force is reduced. Oil separation performance by centrifugal force is enhanced. That is, if the particle size, that is, the mass of the mist oil among the mist oil and the refrigerant gas flowing through the central portion of the inlet pipe (5D) is too small, the centrifugal force acting on the oil becomes difficult to work, and as a result, the oil Although the separation efficiency is lowered, the separation efficiency is increased because the mist-like oil is adhered to the mesh member (15) and removed. Needless to say, the aforementioned inlet pipes (5A) to (5C) can be used instead of the inlet pipe (5D).

[0033]

According to the first aspect of the present invention, as described above, the inlet pipe has a double pipe structure including an inner pipe and an outer pipe, and the inlet portion of the inner pipe is located substantially at the center of the outer pipe. The outlet connected to the container body is deflected toward the center of the container body so as to be in contact with the outer pipe, so that the annular oil film flows along the wall direction of the container body, and the separation efficiency by the annular oil film The internal turbulence that causes a decrease in oil pressure can be prevented, and the annular oil film can be lowered along the wall surface.

According to the second aspect of the present invention, the vicinity of the outlet portion of the inner pipe of the inlet pipe is formed in a partially circular shape in which a portion near the wall surface side of the container body is cut off, so that the entire annular oil film is collected on the wall surface side of the container body. As a result, the fluid flows along the direction of the wall surface of the container main body, and it is possible to prevent internal turbulence that causes a reduction in separation efficiency due to the annular oil film.

According to a third aspect of the present invention, the outlet portion of the inlet pipe is
Since the long radius direction is a flat elliptical cross section that is parallel to the center axis of the container main body, the flow of the annular oil film can be positively guided to the wall side of the container main body, and the inside of the annular oil film generated at the outlet part Disturbance can be prevented, and separation performance by centrifugal force can be promoted. Also, on the inner wall of the container body
Since an oil-repellent fluorine resin coating layer is formed,
Oil particles separated on the wall of the container
Can be moved downward while growing into particles
And re-scattering can be prevented. And Claim 4
According to the invention, since the cross-sectional area of the inlet pipe is made substantially constant, the flow velocity can be made substantially constant.

According to the fifth aspect of the present invention, since the oil-repellent fluororesin coating layer is formed on the inner wall surface of the container body, the separated oil particles are formed into larger spherical particles on the wall surface of the container body. It can be moved to the lower side while growing, and re-scattering can be prevented.

According to the sixth aspect of the present invention, since the particle diameter, that is, the mass of the oil is increased by the mesh member, the separation performance by centrifugal force is further improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a centrifugal oil separator according to a first embodiment.

FIG. 2 is a cross-sectional view of the same.

FIG. 3 is a perspective view of an inlet pipe.

FIG. 4 is a longitudinal sectional view of an inlet pipe.

FIG. 5 is a view similar to FIG. 2 for a second embodiment.

FIG. 6 is a diagram similar to FIG. 3 for a second embodiment.

FIG. 7 is a diagram similar to FIG. 4 for a second embodiment.

FIG. 8 is a view similar to FIG. 1 for a third embodiment.

FIG. 9 is a schematic diagram of a third embodiment.

FIG. 10 is a cross-sectional view of an inlet pipe.

FIG. 11 is a longitudinal sectional view of an inlet pipe.

FIG. 12 is a front view of an inlet portion of the inlet pipe.

FIG. 13 is a front view of an outlet portion of the inlet pipe.

FIG. 14 is an explanatory diagram showing a state in which oil adheres to a wall surface of the container body.

FIG. 15 is a schematic explanatory view of a modification.

FIG. 16 is an explanatory diagram of an operation.

FIG. 17 is an explanatory diagram of an operation.

FIG. 18 is a schematic explanatory view of a fourth embodiment.

FIG. 19 is a transverse sectional view of the same.

FIG. 20 is an explanatory diagram of an operation.

FIG. 21 is a perspective view of a conventional example.

FIG. 22 is a schematic explanatory view of a conventional example.

FIG. 23 is an explanatory diagram of the operation of the conventional example.

[Explanation of symbols]

 1A, 1B, 1C Centrifugal oil separator 2 Container body 2a Inner wall 3 Outlet pipe 4,4A Oil return pipe 5A, 5B, 5C, 5D Inlet pipe 6A, 6B Inner pipe 6a, 6c Inlet part 6b, 6d outlet Part 7 Outer tube 11 Fluorine resin coating layer 15 Mesh member

Claims (6)

(57) [Claims] 1. An outlet pipe (3) at the top of a container body (2).
However, an oil return pipe (4) is provided at the lower part, and the inlet pipes (5A), (5
B) is connected, and by rotating the gas-phase refrigerant and the oil at high speed in the container body (2), centrifugal force is applied to the inner wall surface of the container body (2) to separate oil by centrifugal force. Vessel (1A), wherein the inlet pipe (5A) comprises an inner pipe (6A) and an outer pipe (7)
And the inner pipe (6
The inlet section (6a) of A) is connected to the inlet section (7) of the outer pipe (7).
The outlet portion (6b), which is located near the center of (a) and is connected to the container body (2), is deviated toward the center of the container body (2), and the outlet portion (7b) of the outer pipe (7). A centrifugal oil separator characterized by being in contact with the inner peripheral surface near the center of the container body (2). 2. In place of the inner tube (6A) of claim 1, the inlet portion (6c) has a circular cross section located near the center of the outer tube (7) and is connected to the container body (2). In the vicinity of the outlet portion (6d), an inner tube (6B) having a substantially same diameter as the outer tube (7) and having a partially oval cross-sectional shape lacking a part on the side close to the wall surface of the container body (2) is provided. 2. A centrifugal oil separator according to claim 1, which has an inlet pipe (5B) used. 3. The inlet pipe (5A) having a double pipe structure according to claim 1.
Instead, the inlet portion (5a) has a substantially circular cross section, and gradually changes to an elliptical cross section from the outlet portion toward the outlet portion.
The outlet portion (5b) has a flat cross-sectional elliptical shape, and the inlet pipe (5C) whose major radius direction is parallel to the central axis of the container body (2) is used, while the container body (2 ) is used. ) Is an oil-repellent fluororesin coating on the inner wall.
2. The centrifugal oil separator according to claim 1, wherein a floating layer (11) is formed . 4. The centrifugal oil separator according to claim 3, wherein the inlet pipe (5C) has a substantially constant cross-sectional area. 5. A container body (2) is an inner wall surface of the oil repellent fluororesin co - coating layer (11) centrifugal according to any one of claims 1 or 2 where is formed Oil separator. 6. The outlet pipe (3) has a projecting portion (3a) projecting into the container body (2), and the projecting portion (3a) has:
Where the mesh member (15) is provided at a distance from the inner wall surface (2a) of the container body (2) so as to be substantially perpendicular to the flow blown out from the inlet pipes (5A) to (5D). The centrifugal oil separator according to any one of claims 1 to 5.