JPH0455274Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to an oil-cooled scroll compressor in which cooling, lubrication, sealing, etc. are performed using lubricating oil, and in particular, the invention relates to an oil-cooled scroll compressor in which the casing is placed horizontally. This invention relates to a horizontally installed oil-cooled scroll compressor.

[Prior art]

Conventionally, scroll compressors are oil-free scroll compressors that do not use lubricating oil, and lubricating oil is supplied to the sliding surfaces of the bearings, fixed scroll, and orbiting scroll to achieve cooling, lubrication, sealing, etc. Oil-cooled scroll compressors are known.

In the case of the latter oil-cooled scroll compressor, the entire amount of oil required is stored in the oil separator, and the casing is arranged vertically, with the casing installed at the top of the casing during compression operation. An appropriate amount of lubricating oil is supplied into the casing from the oil supply port to lubricate the bearings, etc., and then guided to the gap between the fixed scroll and the orbiting scroll using natural flow to cool, lubricate, and cool the space between them. It performs a sealing action, etc., and is finally discharged as a mixture of compressed air and lubricating oil from a discharge port to an oil separator, where it is separated into clean air and oil.

As described above, in this type of oil-cooled scroll compressor, the axis of the casing is arranged vertically because it is necessary to direct the flow of lubricating oil from top to bottom and from the standpoint of improving the recovery of lubricating oil. , a vertical type is adopted.

[Problem that the invention attempts to solve]

Therefore, if the above-mentioned vertical oil-cooled scroll compressor is changed to a horizontal type with the axis of the casing in the horizontal direction, due to the installation space of the compressor, the arrangement relationship with other equipment, etc. , there are the following problems. In other words, since the casing is arranged horizontally, a large amount of oil supplied into the casing from the oil separator ends up collecting at the bottom of the crank chamber formed in the large diameter cylinder of the casing. Become. On the other hand, a balance weight is arranged in the crank chamber to balance the orbiting motion of the orbiting scroll. As a result, when the balance weight is rotated by the drive shaft,
There is a problem in that the lubricating oil accumulated at the bottom of the crank chamber generates large rotational resistance, which significantly reduces efficiency. For this reason, in the prior art, the casing of the compressor can only be arranged vertically, which imposes significant restrictions on the design of the compressor and the arrangement of peripheral equipment.

The present invention was devised in view of the problems of the prior art, and it is an object of the present invention to provide a scroll compressor that has a simple structure and allows the casing to be placed horizontally.

[Means for solving problems]

In order to solve the above problems, the configuration adopted by the present invention consists of a casing with one side serving as a bearing portion and the other side serving as a large-diameter cylindrical portion, the axis of which is horizontal, and the size of the casing. A fixed scroll fixed to the radial cylinder side, a suction port formed on the radially outer side of the fixed scroll, a discharge port formed at the axial center of the fixed scroll, and rotatably supported by the bearing section of the casing. The drive shaft is rotatably supported by the crank of the drive shaft, and the compression chamber is rotated while overlapping with the fixed scroll. In a horizontal scroll compressor comprising an orbiting scroll, an oil separator is provided at a discharge port of the fixed scroll and separates oil from a mixture of compressed air and oil discharged from the discharge port; an oil supply port provided on the bearing portion side of the casing and to which oil is supplied from the oil separator due to the pressure within the oil separator; and an oil recovery port provided on the bottom side of the large diameter cylindrical portion of the casing;
an oil return port provided on the fixed scroll so as to open toward a compression chamber on the outer peripheral side, which is a portion having a lower pressure than the crank chamber, or a suction port side of the fixed scroll; the oil recovery port; and the oil return port. In order to recover the oil in the crank chamber to the compression chamber side due to the pressure difference between The engine is characterized by comprising a balance weight that absorbs unbalanced force when the orbiting scroll rotates and also splashes up recovered oil stored at the bottom of the crank chamber.

[Effect]

With this configuration, the oil in the oil separator is supplied from the oil supply port into the casing due to the pressure inside the oil separator, thereby performing lubrication, cooling, etc. inside the casing. At this time, the crank chamber is at a predetermined high pressure due to the pressure inside the oil separator, and on the other hand, while the orbiting scroll rotates relative to the fixed scroll and compresses the gas, the outer compression chamber and suction port are The vicinity is under negative pressure. As a result, the oil accumulated in the bottom of the crank chamber is collected via the flow path into a low-pressure compression chamber defined on the outer circumference side due to the pressure difference between the oil recovery port and the oil return port, and is collected in the fixed scroll. It performs sealing, cooling, lubrication, etc. between the gas and the orbiting scroll, and is discharged together with the compressed gas. During this compression operation, the balance weight is also rotated by the drive shaft, and the recovered oil stored at the bottom of the crank chamber is splashed up to the back side of the orbiting scroll to supply oil.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

In the figure, 1 indicates a casing arranged so that the axis O ₁ -O ₁ is in the horizontal direction, and the casing 1
consists of a bearing portion 1A and a large-diameter cylindrical portion 1B forming a crank chamber, which will be described later, and a stepped scroll fitting hole 1C is formed at the tip side of the large-diameter cylindrical portion 1B.

Reference numeral 2 denotes a fixed scroll, and the fixed scroll 2 includes an end plate 2A, a spiral-shaped wrap portion 2B erected on the end plate 2A, and a spiral wrap portion 2B that protrudes at the same height as the wrap portion 2B so as to surround the wrap portion 2B. The top surface is the sliding surface 2
It is composed of a cylindrical portion 2D that has a shape of C, and a flange portion 2E that extends in the radial direction from the end plate 2A. Then, the cylindrical portion 2D is fitted into the scroll fitting hole 1C of the casing 1, the flange portion 2E is brought into contact with the end surface of the large diameter cylindrical portion 1B, and a bolt (not shown) is inserted.
By being fixed to the casing 1 and the fixed scroll 2, the casing 1 and the fixed scroll 2 are integrated. Further, the wrap portion 2B is formed into an involute or a curve close to an involute. Furthermore, a suction port 3 is formed in the flange portion 2E of the fixed scroll 2, and a discharge port 4 is formed in the end plate 2A at its axial center position.

A drive shaft 5 is provided on the same axis O ₁ -O ₁ as the fixed scroll 2, and the drive shaft 5 is rotatably supported by the bearing portion 1A via bearings 6A and 6B. One end of the drive shaft 5 is equipped with a mechanical seal 7.
The other end protrudes outside the casing 1 through the casing 1 and is connected to a motor (not shown), and the other end protrudes into the large diameter cylindrical portion 1B to become a crank 5A. The axis O ₂ -O ₂ of the crank 5A is connected to the drive shaft 5. It is eccentric by a distance δ with respect to the axis O ₁ −O ₁ of .

Reference numeral 8 denotes an orbiting scroll rotatably supported by the crank 5A of the drive shaft 5 via a bearing 9, and the orbiting scroll 8 is aligned with the axis 0 ₂ -0 ₂ of the crank 5A.
It is located on the same axis as the Here, the orbiting scroll 8 is composed of an end plate 8A and a spiral-shaped wrap portion 8B provided upright on the end plate 8A, and the wrap portion 8B is formed into an involute or a curve close to an involute. And lap part 8B
are attached so as to overlap with the lap portion 2B of the fixed scroll 2 at a predetermined angle, and a plurality of compression chambers 10 are formed as airtight spaces between the wrap portions 2B and 8B. Further, the end plate 8A is fitted into the scroll fitting hole 1C of the casing 1, and the end plate 8A is configured to rotate while sliding on the sliding surface 2C of the fixed scroll 2.

Reference numeral 11 denotes a crank chamber formed between the inside of the large-diameter cylindrical portion 1B of the casing 1 and the back surface of the orbiting scroll 8. In the crank chamber 11, an Oldham joint 12 as a rotation prevention mechanism is provided. When rotating the drive shaft 5 to rotate the orbiting scroll 8, the orbiting scroll 8 is aligned with the axis of the drive shaft 5.
It guides it to revolve around O ₁ −O ₁ with a radius δ. Reference numeral 13 denotes a balance weight located within the crank chamber 11 and fixed to the drive shaft 5;
is fixed in a direction opposite to the eccentric direction of the orbiting scroll 8, so as to absorb the unbalanced force generated by the orbiting of the orbiting scroll 8, and enable the drive shaft 5 to rotate smoothly.

Reference numeral 14 denotes a bracket that is fixed to the side surface of the bearing portion 1A of the casing 1 and constitutes a part of the casing 1. Reference numeral 15 denotes an oil filler port drilled in the bracket 14 so as to open into the bearing portion 1A. 15
Oil is supplied from an oil separator 21, which will be described later, to lubricate the bearings 6A, 6B, 9, Oldham joint 12, etc.

Reference numeral 16 denotes an oil recovery port located on the bottom side of the large diameter cylindrical portion 1B of the casing 1 and bored in the large diameter cylindrical portion 1B. 17 is the piping 19 and oil return port 1, which will be described later.
8 to the suction space or compression chamber located on the low pressure side.

Reference numeral 18 denotes an oil return port drilled in the end plate 2A of the fixed scroll 2, and the oil return port 18 opens into a portion having a lower pressure than the inside of the crank chamber 11 during compression operation, that is, into the outermost compression chamber 10'. ing. Here, in addition to the compression chamber 10' on the outermost circumferential side according to the present embodiment, the pressure chamber lower than that of the crank chamber 11 is a compression chamber formed in an intermediate region. It may be an intermediate compression chamber where the pressure is not high, or it may be near the suction port 3. In addition, since the suction passage near the suction port 3 and the suction passage connected to the outermost compression chamber 10' will be in a state lower than atmospheric pressure, it will be more effective if the oil return port 18 is provided here. be. 19 is oil recovery port 16
This is a return pipe that connects between the oil return port 18 and the oil return port 18.

Further, 20 is a discharge pipe whose one end is connected to the discharge port 4 and the other end is connected to an air tank, air equipment, etc., and a part in the middle of the discharge pipe 20 separates oil from the mixture of compressed air and oil. Oil separator 21 for
is provided. A part of the oil in the oil separator 21 is connected to the oil supply port 15 via an oil pipe 22, and the oil is configured to be supplied into the casing 1 using the pressure in the oil separator 21. has been done.

The present embodiment is constructed as described above, and the compressor is arranged as shown in the figure, with the axis ₁ - _O1 being horizontal.

Here, when the motor rotates, the rotation is transmitted to the orbiting scroll 8 via the drive shaft 5 and the bearing 9, and the orbiting scroll 8 performs a circular motion relative to the fixed scroll 2. And suction port 3
The air sucked in is gradually pressurized within the compression chamber 10 and is discharged from the discharge port 4 after being raised to a predetermined pressure. Then, this discharged air is transferred to the discharge pipe 2
0 to the oil separator 21, and the oil separator 21
After removing oil, the clean compressed air is supplied to an air tank or the like.

On the other hand, the orbiting scroll 8 is aligned with the axis O ₁ of the drive shaft 5
Since it revolves at a position offset by a predetermined distance δ with respect to -O ₁ , the unbalanced force caused by the orbiting of the orbiting scroll 8 is absorbed by the balance weight 13 .

Furthermore, during compression operation, the oil in the oil separator 21 is
Due to the pressure in the oil separator 21, oil is supplied from the oil supply port 15 through the oil pipe 22 into the bearing portion 1A of the casing 1, and the mechanical seal 7 and the bearings 6A, 6 are
B etc. are refueled. The oil that has reached the bearing 6B flows out into the crank chamber 11 and is stored at the bottom of the crank chamber 11 as recovery oil 17.
is lifted up when the balance weight 13 rotates, and oil is supplied to the bearing 9, Oldham joint 12, etc.

Therefore, in this embodiment, an oil recovery port 16 is provided at the bottom side of the large diameter cylindrical portion 1B of the casing 1,
The oil recovery port 16 is connected to an oil return port 18 on the lower pressure side than the crank chamber 11 via a return pipe 19, and a part of the pressure of the oil separator 21 is supplied to the inside of the crank chamber 11 to maintain a predetermined level. It is in a pressurized state. As a result, the recovered oil 17 accumulated at the bottom of the crank chamber 11 is released from the oil return port 18 via the return pipe 19 due to the pressure difference between the crank chamber 11 and the outermost compression chamber 10'. It is recovered into the compression chamber 10'. As the orbiting scroll 8 rotates, the oil in the compression chamber 10' is sequentially transferred to the compression chamber 10 on the center side and discharged from the discharge port 4 together with the compressed air. In addition to cooling the orbiting scroll 8, it also performs lubrication and sealing between the wrap portions 2B and 8B, and sealing between these and the end plates 2A and 8A.

Thus, in this embodiment, even if the casing 1 is of the horizontal type, only a certain amount of recovery oil 17 is always present at the bottom of the crank chamber 11, so the balance weight 13 can be rotated smoothly and there is no problem. Does not give rotational resistance.

In addition, in the present invention, when the casing 1 is installed horizontally and placed horizontally, it does not need to be in a completely horizontal position, and may be placed slightly tilted. Further, although the return pipe 19 is shown as being disposed outside the casing 1 and the fixed scroll 2, it may be an oil passage bored inside the casing 1 and the fixed scroll 2. Furthermore, although the oil supply port 15 has been described as being provided in the bracket 14, it may be provided in the bearing portion 1A of the casing 1.

[Effect of idea]

The present invention, as described in detail above, supplies oil into the crank chamber from the oil supply port of the casing using the pressure inside the oil separator, and drains the oil accumulated at the bottom of the crank chamber between the oil recovery port and the oil supply port. This is because the oil is collected into the compression chamber from the outer compression chamber or suction port side, which is a low-pressure area, by utilizing the pressure difference between the oil and the return port, and a small amount of recovered oil is stored at the bottom of the crank chamber. , it is possible to maintain a constant amount of recovered oil at the bottom of the crank chamber without using a separate oil supply pump, etc., and even when the casing is placed horizontally, it resists the rotation of the balance weight. In addition, the balance weight can splash up lubrication into the crank chamber in a good manner.

[Brief explanation of drawings]

The figure is a longitudinal sectional view showing an embodiment of the present invention. 1...Casing, 1A...Bearing section, 1B...
Large diameter cylinder part, 2...Fixed scroll, 3...Suction port, 4...Discharge port, 5...Drive shaft, 8...Orbiting scroll, 10...Compression chamber, 11...Crank chamber, 13... Balance weight, 15...Oil filler port, 16...Oil recovery port, 17...Oil for recovery, 18
... Oil return port, 19 ... Return piping, 20 ... Discharge piping, 21 ... Oil separator, 22 ... Oil piping.

Claims (1)

[Scope of utility model registration request] A casing with one side serving as a bearing portion and the other side serving as a large-diameter cylindrical portion, the axis of which is arranged in a horizontal direction, a fixed scroll fixed to the large-diameter cylindrical portion side of the casing, and a diameter of the fixed scroll. A suction port formed on the outside in the direction and a discharge port formed at the center of the axis of the fixed scroll are rotatably supported by the bearing part of the casing, and the tip part is located in the crank chamber in the large diameter cylinder part and cranks the scroll. In a horizontal scroll compressor, the horizontal scroll compressor comprises a drive shaft, and an orbiting scroll that is rotatably supported by the crank of the drive shaft and that forms a compression chamber while overlapping and orbiting the fixed scroll. an oil separator provided at the outlet of the casing to separate oil from the mixture of compressed air and oil discharged from the outlet; and an oil separator provided on the bearing side of the casing to control the pressure inside the oil separator. an oil supply port through which oil is supplied from the oil separator, an oil recovery port provided on the bottom side of the large-diameter cylindrical portion of the casing, and a compression chamber on the outer peripheral side that has a lower pressure than the crank chamber. The oil in the crank chamber is recovered to the compression chamber side by the pressure difference between the oil return port provided on the fixed scroll so as to open on the suction port side of the fixed scroll, the oil recovery port, and the oil return port. In order to A horizontal scroll compressor characterized by being equipped with a balance weight that splashes recovered oil stored at the bottom of a crank chamber.