JP3417031B2 - Horizontal compressor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal compressor mainly used in refrigeration equipment.

[0002]

2. Description of the Related Art Conventionally, a horizontal compressor is disclosed, for example, in Japanese Patent Laid-Open No.
The one shown in Japanese Patent No. 173390 is known. This horizontal compressor, as shown in FIGS. 4 and 5,
A motor B composed of a stator B1 and a rotor B2 is housed on one side in the longitudinal direction in the closed casing A, and a compression element D driven by a drive shaft C of the rotor B2 is housed on the other side, and an oil reservoir is provided at the bottom of the casing. Forming O.

The compression element D is a cylinder chamber D.
1 and a front head D3 and a rear head D4 that sandwich the cylinder D2. The compression element D allows the inside of the casing A to be a primary discharge space E on the motor side and a secondary discharge on the opposite side of the motor. A discharge passage D6 which is divided into a space F and is temporarily discharged into a muffler D5 attached to the rear head D4 after being compressed in the cylinder chamber D1 and then formed through the rear head D4, the cylinder D2 and the front head D3. Oil is discharged to the space between the compression element D and the motor B in the primary discharge space E via the oil while the oil is stored in the secondary discharge space F in the oil supply passage C1 formed in the drive shaft C. The oil in the reservoir O is supplied to each sliding portion of the compression element D.

Further, the horizontal compressor shown in FIGS. 4 and 5 is
The cylinder D2 is formed with a projecting portion G projecting toward the inner peripheral surface of the casing A over the entire circumference of the cylinder D2, and a gas passage H is provided above the projecting portion G.
And the oil passage I is formed in the lower part, and the inside of the casing A is made into the primary discharge space E at the projecting portion G.
And a secondary discharge space F.
Further, a partition plate J is disposed on the motor side of the projecting portion G with a predetermined gap, and a space K is formed between the partition plate J and the projecting portion G. The lower end of the plate J is positioned with a predetermined gap between the lower end of the plate J and the bottom of the casing A so that the lower end is in contact with the oil passage I, and the primary discharge space E is provided below the partition plate J. Is formed with an oil / gas communication passage L that communicates with the oil passage I and the space K, and the gas discharged from the compression element D into the primary discharge space E is the gas in the primary discharge space E. The oil surface is pushed down, and by pushing down the oil surface, the discharge gas is introduced into the space portion K, the lubricating oil mixed in the discharge gas is separated, and the gas introduced into the space portion K is expanded. From the gas passage H formed in the part G,
The secondary discharge space F is discharged and further discharged from the discharge pipe M opened in the secondary discharge space F to the outside of the casing, while the lubricating oil stored in the primary discharge space E is
When the oil surface is pushed down, it is sent to the secondary discharge space F through an oil passage I formed in the overhanging portion G, and the oil surface of the secondary discharge space F is pushed up. When the oil level in the discharge space E drops, the motor B
The oil is prevented from coming into contact with the rotor B2 and the amount of oil stored in the secondary discharge space F is secured.

[0005]

However, in the above-described conventional horizontal compressor, the discharge gas discharged into the primary discharge space E pushes down the oil surface of the primary discharge space E to generate the discharge gas. It passes through the oil / gas communication passage L formed in the lower part of the partition plate J, and the partition plate J and the projecting portion G
Since the space K formed between the partition plate J and the secondary discharge space F is raised from the gas passage H formed in the overhanging part G, the lower end of the partition plate J is formed of the oil. It is necessary to provide it at a position close to the oil surface of the sump O, so that when the gas passes through the lower end portion of the partition plate J, a large amount of oil is scraped up by the gas, and in particular,
Forming occurs in the oil sump O when the oil level of the oil sump O becomes high, such as when the compressor is started, or when the lower end of the partition plate J is immersed in the oil level. The amount of oil scraped up is very large. As a result, the oil reaches the secondary discharge space F without sufficient oil separation in the space K, and a gas containing a large amount of oil is discharged from the discharge pipe M, which increases the amount of discharged oil. ,
There was a problem of oil rising.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a horizontal compressor capable of reducing oil entrapment in an oil sump due to a discharge gas while sufficiently separating oil. Especially.

[0007]

In order to achieve the above-mentioned object, the invention according to claim 1 is such that a motor 21 is internally mounted on one side in the length direction of a closed casing 1 having an oil sump 1a at the bottom,
A compression element 3 is installed on the other side in the length direction, the casing 1 is partitioned by the compression element 3 into a motor side and an anti-motor side, and the primary discharge space E provided on the motor side of the compression element 3 is provided with the compression element 3. In a horizontal compressor in which the compressed gas compressed by the compression element 3 is discharged and the discharge pipe 11 is opened in the secondary discharge space F on the side opposite to the motor of the compression element 3, the casing 1 is connected to the motor side and the non-motor side. The gas passage 43 is provided in the upper portion of the compression element 3 and the oil passage 44 is provided in the lower portion of the compression element 3, and the partition plate 8 facing the gas passage 43 is provided to the compression element 3 on the motor side of the compression element 3. through the gap disposed, thereby forming an oil separation passage 9 between the compression element 3 and the partition plate 8, the oil separation passage 9
Is opened at a position distant from the gas passage 43 with respect to the primary discharge space E and at a position higher than the maximum oil surface height of the oil stored in the oil reservoir 1a, and is discharged into the primary discharge space E.
To allow the discharged gas to flow into the oil separation passage 9 through the opening.
The oil mixed in the gas is separated more .

Further, according to a second aspect of the present invention, the compression element 3 is connected to the front head 6, the rear head 7 and the cylinder 4.
And a muffler 61 is attached to the front head 6, and a mounting end of the muffler 61 to the front head 6 is extended toward the inner peripheral surface of the closed casing 1 to integrally form the partition plate 8. Was formed.

[0009]

As described above, according to the first aspect of the invention, since the oil separating passage 9 is formed by the partition plate 8, the gas discharged from the compression element 3 to the primary discharge space E is The oil mixed in this gas is separated in the oil separation passage 9, and the opening of the oil separation passage 9 to the primary discharge space E is set to the maximum of the oil reservoir 1a in the primary discharge space E. Since the opening is made at a position higher than the oil level, the gas discharged into the primary discharge space E can be flowed into the oil separation passage 9 without colliding with the oil in the oil reservoir 1a, and thus, in the conventional case. As in the example, it is possible to reduce the amount of oil scraped up by the gas, and thus the amount of oil lifted to the oil separation passage 9 can be reduced. In particular, at the time of startup, the oil surface height of the oil reservoir 1a can be reduced. Even if the As a result, the occurrence of foaming can be reduced, and therefore the lifting of oil due to the occurrence of foaming can be reduced as compared with the conventional case, and as a result, the oil mixed in the discharge gas in the oil separation passage 9 can be separated better. The amount of oil mixed in the gas passing through the gas passage 43 is greatly reduced as compared with the conventional case.

According to the second aspect of the invention, the compression element 3 comprises a front head 6, a rear head 7 and a cylinder 4, and the front head 6 has a muffler 61.
By attaching the muffler 61 to the front head 6 and extending toward the inner peripheral surface of the closed casing 1 to integrally form the partition plate 8,
Since it is not necessary to form the partition plate 8 as a separate component, the partition plate 8 can be disposed only by attaching the muffler 61 to the front head 6, so that the number of components does not increase and the assemblability is increased accordingly. Can be improved.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A typical embodiment of the present invention will be described with reference to the drawings. The embodiment shown in FIG. 3 is a rotary two-cylinder horizontal compressor, in which a motor 21 including a stator 21a and a rotor 21b is provided on one side in the longitudinal direction inside the horizontal hermetic casing 1.
The compression element 3 driven by the drive shaft 22 of the rotor 21b is housed on the other side, and the oil sump 1a is formed at the bottom of the casing.

The compression element 3 includes cylinder chambers 41 and 51.
First cylinder 4 and second cylinder 5 each having a middle plate 3 interposed between the cylinders 4 and 5.
1 and a front head 6 and a rear head 7 that sandwich the cylinders 4 and 5, respectively.
In the casing 1, the primary discharge space E on the motor side
And the secondary discharge space F on the side opposite to the motor, and the discharge pipe 11 is opened in the secondary discharge space F.

The gas compressed in the first cylinder chamber 41 of the first cylinder 4 on the front head side is
The gas once discharged into the first muffler 61 attached to the front head 6 and the gas compressed in the second cylinder chamber 51 of the second cylinder 5 on the rear head side is once introduced into the second muffler 71 attached to the rear head 7. The first cylinder chamber is discharged by being discharged into the first muffler 61 through a discharge passage (not shown) penetrating the rear head 7, the cylinders 4, 5, the middle plate 31, and the front head 6. The gas compressed in 41 is merged, and the gas discharged into the first muffler 61 is discharged into the primary discharge space E from a gap formed between the bearing cylinder 62 of the front head 6 and the first muffler 61. I am trying to let you.

On the other hand, an oil supply passage 23 extending in the axial direction is formed in the drive shaft 22, and an oil supply pipe 24 is attached to an end portion of the drive shaft 22 on the side of the secondary discharge space. Oil is pumped from the oil reservoir 1a formed in the above into the oil supply passage 23 to supply oil to each sliding portion of the compression element 3.

Further, in the horizontal compressor shown in FIG. 3, as shown in FIGS. 1 and 2, the first overhanging portion 4 which overhangs the first cylinder 4 toward the inner peripheral surface of the casing 1.
2 is formed over the entire circumference of the first cylinder 4, the outer peripheral portion of the first overhanging portion 42 is brought into contact with the inner circumferential surface of the casing 1, and the first overhanging portion 42 The primary discharge space E and the secondary discharge space F are partitioned and formed, and the first projecting portion 42 is fixed to the casing 1. Further, a gas passage 43 is formed by forming a through hole in the upper portion of the first overhanging portion 42, and an oil passage 44 is formed in the lower portion by notching the outer peripheral portion of the first overhanging portion 42. The gas discharged into the primary discharge space E is sent to the secondary discharge space F through the gas passage 43 and discharged from the discharge pipe 11 to the outside of the casing, while the oil sump 1a accumulated in the primary discharge space E The oil is discharged through the oil passage 44 to the secondary discharge space F.
To secure the oil surface of the oil reservoir 1a in the secondary discharge space F.

The second cylinder 5, as shown by the dotted line in FIG. 2, is provided with a partial second overhanging portion 52 which is generally known from the past, and the second overhanging portion 52 is provided. Is located at a position displaced from the formation position of the gas passage 43 so as not to face the gas passage 43 formed in the first protrusion 42, and the second protrusion 5 is
2 is fixed to the casing 1. An oil passage 44 is also formed in the second overhang portion 52 at the same position as the oil passage 44 of the first overhang portion 42 on the lower side similarly to the first overhang portion 42.

Further, a partition plate 8 facing the gas passage 43 is arranged on the motor side of the compression element 3 with a predetermined gap between the compression element 3 and the compression element 3 to separate the partition plate 8. An oil separation passage 9 is formed between the gas separation passage 9 and the gas passage 43 with respect to the primary discharge space E.
That is, the opening is made at a position apart from and at a position higher than the maximum oil surface height of the oil stored in the oil reservoir 1a.

In the embodiment shown in the drawings, the mounting end of the first muffler 61 to the front head 6 is extended toward the inner peripheral surface of the closed casing 1 to integrally form the partition plate 8. ing. That is, the first muffler 61 has a cup-like shape that fits on the side surface of the front head 6, and is provided with a plurality of mounting seats so as to be fixed to the end surface side of the front head by tightening bolts 63. The end portion of the mounting portion of the first muffler 61 fitted to the side surface of the front head 6 extends radially outwardly over a half circumference thereof to a position close to the inner peripheral surface of the casing 1. An outward flange is provided, and the partition plate 8 is integrally formed by the outward flange.

The outward brim forming the partition plate 8 is erected from the end of the mounting portion to the side opposite to the cylinder, and is extended radially outward from the erected position so that the partition plate 8 is formed. And a motor-side end surface of the first cylinder 4 forms a predetermined gap that allows oil to be separated from the discharge gas. It is preferable that the outer peripheral portion of the partition plate 8 is in close contact with the inner peripheral surface of the casing 1. However, it may be formed so as to have a slight gap in consideration of the assembling property.

When the first muffler 61 is attached to the front head 6, the partition plate 8 is assembled so as to be located on the upper side of the casing 1. By this assembly, the first overhang is formed. In the upper part of the casing on the motor side of the portion 42, between the partition plate 8 and the first overhanging portion 42, a semicircular oil in which gas flows upward from around the front head 6. The separation passage 9 is formed. Further, the partition plate 8 is
It is formed over a half circumference of the first muffler 61, the lower end portion of the partition plate 8 is positioned at an intermediate position in the height direction inside the casing 1, and the oil separation passage 9 is opened to the primary discharge space E. Therefore, the height of the opening is opened at a position distant from the gas passage 43 and higher than the maximum oil level of the oil stored in the oil reservoir 1a.

In the present embodiment, the partition plate 8 is formed so that the lower end portion thereof is located at the middle position in the height direction of the casing 1, but it is located below the middle position in the height direction of the casing 1. It may be located at a position higher than the maximum oil surface height of the oil surface height of the oil stored in the oil reservoir 1a, and the shape of the opening can be freely set. You can The partition plate 8 is formed integrally with the first muffler 61.
A plate material provided separately from the above may be used and attached to the first muffler 61 or the front head 6. Also,
The muffler is not always necessary. Therefore, when the muffler is not attached to the front head 6, only the partition plate 8 may be attached directly to the front head 6.

As described above, since the partition plate 8 can form the oil separation passage 9 between the primary discharge space E and the secondary discharge space F, the gas flows upward from below. The gas discharged from the compression element 3 to the primary discharge space E is allowed to pass through the oil separation passage 9 without directly passing through the gas passage 43 formed in the first overhang portion 42. After the oil mixed in the gas is separated, it can be discharged to the secondary discharge space F through the gas passage 43 and discharged from the discharge pipe 11 to the outside of the casing.

Furthermore, the opening of the oil separation passage 9 formed by the partition plate 8 to the primary discharge space E is located at a position away from the gas passage 43 and in the primary discharge space E. Since it is opened at a position higher than the maximum oil surface height, the gas discharged into the primary discharge space E can flow into the oil separation passage 9 without colliding with the oil in the oil reservoir 1a. Therefore, unlike the conventional example, it is possible to reduce the amount of oil scraped up by gas, and thus the amount of oil lifted to the oil separation passage 9 can be reduced. Even if the height of the oil surface becomes high, the occurrence of forming can be reduced, and therefore the lifting of oil due to the occurrence of forming can be reduced as compared with the conventional case, and as a result, the oil separation passage 9
The oil mixed in the discharge gas can be separated better, and the amount of oil mixed in the gas passing through the gas passage 43 is significantly reduced as compared with the conventional case.

On the other hand, the inside of the casing 1 is divided into the primary discharge space E and the secondary discharge space F by the first projecting portion 42, and the gas in the primary discharge space E is the gas passage 43. Since it is sent to the secondary discharge space F only from the above, the pressure of the primary discharge space E becomes higher than the pressure of the secondary discharge space F due to the passage resistance when passing through the gas passage 43, etc. The oil in the primary discharge space E is sent to the secondary discharge space F through the oil passage 44 by high pressure gas pressure, and the oil level of the oil reservoir 1a in the secondary discharge space F can be secured. Since the oil level of the primary discharge space E can be made lower than the oil level of the secondary discharge space F, oil contact with the rotor 21b of the motor 21 can be reduced.

Further, since the partition plate 8 is formed integrally with the first muffler 61, it is not necessary to form additional parts, and therefore, the number of parts does not increase and the assembling property is improved accordingly. You can do it.

In the above-described embodiment, the two-cylinder type rotary compressor is explained, and the inside of the casing 1 is divided only by the first overhanging portion 42 of the first cylinder 4. The cylinder 5 may also have an overhanging portion formed over the entire outer peripheral portion thereof. Furthermore, the present invention can be applied to a one-cylinder rotary compressor, a compressor having two or more cylinders, and can be applied not only to a rotary compressor but also to other horizontal compressors such as a scroll compressor. In the case of a scroll compressor, for example, the casing is divided by the fixed scroll of a compression element composed of a fixed scroll and a movable scroll, and the gas compressed by the compression element is discharged to the primary discharge space on the fixed scroll side, A gas passage is formed in the outer peripheral portion of the fixed scroll so as to be sent to the secondary discharge space on the movable scroll side, and a discharge passage from a discharge hole formed in the fixed scroll center portion between the end plate of the fixed scroll. In order to ensure the above, the oil separating passage is formed by arranging a partition plate around the discharge hole.

[0027]

As described above, according to the first aspect of the present invention, the motor 21 is internally provided on one side in the length direction of the closed casing 1 having the oil sump 1a at the bottom and compressed on the other side in the length direction. The interior of the casing 3 is provided with the element 3, and the casing 1 is provided by the compression element 3.
Is divided into a motor side and a non-motor side, and the gas compressed by the compression element 3 is discharged into a primary discharge space E provided on the motor side of the compression element 3, and a secondary gas on the non-motor side of the compression element 3 is discharged. In the horizontal compressor in which the discharge pipe 11 is opened in the discharge space F, a gas passage 43 is provided above the compression element 3 that divides the casing 1 into a motor side and an anti-motor side, and an oil passage 44 is provided below the compression element 3. The partition plate 8 facing the gas passage 43 is provided on the motor side of the compression element 3.
Is disposed with a predetermined gap with respect to the compression element 3, an oil separation passage 9 is formed between the compression element 3 and the partition plate 8, and the oil separation passage 9 is provided in the primary discharge space E. On the other hand, the gas discharged from the compression element 3 to the primary discharge space E is opened at a position apart from the gas passage 43 and at a position higher than the maximum oil level of the oil stored in the oil reservoir 1a. Oil mixed therein can be separated in the oil separation passage 9, and further, the oil separation passage 9
Of the primary discharge space E to the primary discharge space E.
Since it is opened at a position higher than the maximum oil surface height of the oil sump 1a, the gas discharged into the primary discharge space E does not collide with the oil in the oil sump 1a and the oil separation passage 9
Therefore, it is possible to reduce the amount of oil scraped up by the gas as in the conventional example, and thus the amount of oil lifted to the oil separation passage 9 can be reduced. Even when the oil surface height of the oil reservoir 1a becomes high, the occurrence of forming can be reduced, and therefore, the lifting of oil due to the occurrence of forming can be reduced as compared with the conventional case, and as a result, the oil separation passage 9 can be formed. The oil mixed in the discharge gas can be better separated, and the amount of oil mixed in the gas passing through the gas passage 43 can be greatly reduced as compared with the conventional case.

According to a second aspect of the present invention, the compression element 3 comprises a front head 6, a rear head 7 and a cylinder 4, a muffler 61 is attached to the front head 6, and the muffler 61 is provided with the muffler 61. Since the end portion to be attached to the front head 6 is extended toward the inner peripheral surface of the closed casing 1 and the partition plate 8 is integrally formed, it is not necessary to separately form the partition plate 8. Since the partition plate 8 can be arranged only by attaching the muffler 61 to the front head 6, the assembling property can be improved correspondingly without increasing the number of parts.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view of a horizontal compressor of the present invention.

FIG. 2 is a cross-sectional view of a compression element taken along line XX in FIG.

FIG. 3 is a sectional view showing the overall structure of a horizontal compressor of the present invention.

FIG. 4 is a sectional view showing a conventional horizontal compressor.

5 is a cross-sectional view of the compression element in the YY cross section of FIG. 4;

[Explanation of symbols]

1 Airtight casing 6 Front head 1a Oil sump 61 Muffler 11 Discharge pipe 7 Rear head 21 Motor 8 Partition plate 3 Compression element 9 Oil separation passage 4 Cylinder E Primary discharge space 43 Gas passage F Secondary discharge space 44 Oil passage

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-173390 (JP, A) JP-A-5-133375 (JP, A) JP-A-2-19689 (JP, A) Actual Kaihei 1- 166289 (JP, U) Actual development Sho 64-27493 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F04C 29/02

Claims (2)

(57) [Claims] 1. A motor (21) is installed inside one side in the length direction of a closed casing (1) having an oil sump (1a) at the bottom,
A compression element (3) is installed on the other side in the length direction, and the casing (1) is divided into a motor side and a non-motor side by the compression element (3), and the motor side of the compression element (3). The compressed gas compressed by the compression element (3) is discharged to the primary discharge space (E) provided in the discharge pipe (11) to the secondary discharge space (F) on the side opposite to the motor of the compression element (3).
In a horizontal compressor having an opening, a gas passage (43) is provided at a lower part and an oil passage (4) is provided at a lower part of the compression element (3) that divides the casing (1) into a motor side and a non-motor side.
4) is provided, on the motor side of the compression element (3),
The partition plate facing the gas passage (43) said relative compression element (3) to (8) via a predetermined gap disposed, oil between the partition plate (8) and said compression element (3) A separation passage (9) is formed, and the oil separation passage (9) is stored in the oil sump (1a) at a position away from the gas passage (43) with respect to the primary discharge space (E). The primary discharge space is opened at a position higher than the maximum oil level of the oil
The gas discharged to (E) is passed through the opening to the oil separation passage.
(9) A horizontal compressor characterized by separating the oil mixed in the gas by flowing it into the inside . 2. The compression element (3) comprises a front head (6), a rear head (7) and a cylinder (4). The muffler (61) is attached to the front head (6) and the muffler (61) is attached. The horizontal compressor according to claim 1, wherein a mounting end of the front head (6) is extended toward an inner peripheral surface of the closed casing (1) to integrally form a partition plate (8).