JPH0730742B2 - Oil-cooled scroll compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an oil-cooled scroll that is supplied with oil to perform cooling, lubrication, etc. when compressing air or a refrigerant (hereinafter referred to as air), for example. Regarding compressors.

[Conventional technology]

Generally, among scroll compressors, an oil-cooled scroll compressor includes a compressor body that compresses air while the orbiting scroll orbits with respect to a fixed scroll, and oil that is stored and discharged from the compressor body. And an oil separation tank for removing oil in compressed air.Each oil supply part of the compressor body, such as the end plate sliding surface of the orbiting scroll and fixed scroll, the oil supply holes in the compression chamber, the bearing part, etc., is external oil piping. Connected through.

Such an oil-cooled scroll compressor supplies oil to each refueling portion of the compressor body through an external oil pipe, cools, lubricates, and seals each refueling portion, while sucking air from the suction port. Is compressed, the compressed air is discharged together with oil into an oil separation tank, and clean air from which oil has been removed in the oil separation tank is supplied to an air tank or pneumatic equipment.

[Problems to be solved by the invention]

However, in the oil-cooled scroll compressor according to the above-mentioned conventional technology, the oil separation tank and the compressor body are connected via the external oil pipe, so the oil supply pipe system becomes complicated,
In addition, a large number of pipes, joints, seal members, etc. are required, which causes a problem of high price. Further, since a capillary tube or the like is used as the external oil pipe, there is a problem that not only the oil supply pipe system becomes long, but also a large pressure loss occurs when oil flows in the capillary tube, and sufficient oil supply cannot be achieved. Further, since the compressor main body and the oil separation tank are configured separately, or the oil separation tank is directly attached to the compressor main body, the product becomes large and the scroll compressor originally has low noise. However, there is a problem that the noise of the compressor body directly leaks to the outside.

The present invention has been made in view of the above problems of the prior art, and provides an oil-cooled scroll compressor capable of performing oil supply to a lubrication site without using external piping and without using piping. With the goal.

[Means for solving problems]

In order to solve the above-mentioned problems, the structure adopted by the oil-cooled scroll compressor according to the present invention has an oil separation tank for storing oil and a horizontal installation in the oil separation tank such that the axis line is horizontal. And a rotary shaft that is rotatably supported by the casing and has a distal end located in the casing and serving as a crank, and is rotatably attached to the crank of the rotary shaft and is spirally wound on the end plate. An orbiting scroll provided with a wrap portion, and a fixed scroll fixed to the casing and provided with a spiral wrap portion which is fixed to the casing and overlaps with the wrap portion of the orbiting scroll to form a compression chamber,
The fixed scroll is provided in the center of the end plate and is formed in the end of the fixed scroll and the end of the fixed scroll and the end of the fixed scroll, and is formed between the fixed scroll and the orbiting scroll. An oil injection hole for supplying oil to an oil supply portion of an intermediate compression chamber of the compression chamber, and an oil supply hole provided on the outer peripheral side of the fixed scroll for supplying oil between the end plate of the orbiting scroll, A cover provided on the side opposite to the wrap portion of the fixed scroll, in which an oil passage from the oil injection hole to the oil supply hole is formed independently of the discharge port, and one end opening into the oil in the oil separation tank However, the other end side is composed of the casing and an oil passage which penetrates the fixed scroll and communicates with the oil passage of the cover.

[Action]

With the above configuration, the oil stored in the oil separation tank can be supplied to the oil injection hole and the oil supply hole through the oil passage that penetrates the casing and the fixed scroll and the oil passage of the cover, without using an external pipe or the like. Oil can be supplied to each oil supply portion, the configuration can be simplified, and the oil passage can be formed by easy processing.

Further, an oil passage is provided so as to pass through the casing and the fixed scroll, and the oil passage is communicated with the oil passage of the cover so that the oil passage has the shortest distance. , The oil in the oil separation tank smoothly flows through the oil passage due to the pressure in the oil separation tank,
While being constantly supplied into the oil passage groove to fill the oil passage groove,
Oil is stably supplied from the oil injection hole, which increases resistance during refueling due to the pressure in the compression chamber, to the oiling site of the intermediate compression chamber, and from the oiling hole with low resistance between the fixed scroll and the end plate of the orbiting scroll.

〔Example〕

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4.

First, in FIG. 1, reference numeral 1 is an oil separation tank, and the oil separation tank 1 is composed of a cylindrical tank body 2 and a discharge side cover 3 provided on the right side surface of the tank body 2. Lubricating oil 4 is stored. Here, the tank body 2
A compressor main body mounting hole 2A is formed on the left side of, and an oil passage hole 5 is formed on the lower side of the mounting hole 2A, and the other side surface of the compressed air discharged together with oil is An oil separation filter 6 that removes oil is provided. Further, the discharge side cover 3 is provided with a discharge hole 7 for discharging the compressed air cleaned by the oil separation filter 6 to the outside.

Next, reference numeral 8 denotes a compressor body horizontally mounted in the tank body 2 through the compressor body mounting hole 2A of the tank body 2 with the same axis as a rotation shaft described later. The structure is as shown in FIG.

That is, in FIG. 2, reference numeral 9 denotes a tubular casing that constitutes the compressor body 8, and the casing 9 is formed on the other side of the bearing portion 9A so as to form the bearing portion 9A and the crank chamber 9B therein. A large-diameter cylindrical portion 9C, a flange portion 9D formed axially intermediate the bearing portion 9A, a valve formed on the lower surface side of the bearing portion 9A, which is located on the left side surface of the flange portion 9D. Filter mounting part
9E and the suction port forming portion 9F formed on the side surface (see FIG. 1), the bearing portion located on the right side surface of the flange portion 9D.
The suction passage forming portion 9G formed on the side surface side of 9A and the oil passage forming portion 9H formed on the lower surface side (see FIG. 1) are integrally configured. The casing 9 is inserted into the compressor body mounting hole 2A so that the large-diameter cylinder portion 9C is located inside the tank body 2, and is fixed to the left side surface of the casing body 9 through the flange portion 9D.

Reference numeral 10 denotes a rotary shaft rotatably attached to the bearing portion 9A of the casing 9 via bearings 11 and 11. The rotary shaft 10 is mounted on the oil separation tank 1 outside the tank body 2 on the left end side. Is provided with a pulley 12 that is connected to a motor (not shown) that is driven, and the right end of the pulley 12 extends into the crank chamber 9B.
It is A. Then, the axis O ₂ -O ₂ of the crank 10A relative to the axis O ₁ -O ₁ of the rotary shaft 10 is eccentric by the radial distance [delta].

Reference numeral 13 denotes an orbiting scroll rotatably supported by a crank 10A of the rotary shaft 10 via an orbiting bearing 14,
13 is provided on the same axis as the axis O ₂ -O ₂ of the crank 10A. Then, the orbiting scroll 13 is a flat end plate 13A.
And a wrap portion 13B formed on the right side surface of the end plate 13A in an involute or a spiral shape close to the involute. Reference numeral 15 is an Oldham coupling as a rotation preventing mechanism, and the Oldham coupling 15 guides the orbiting scroll 13 to revolve around the axis O ₁ -O ₁ of the rotating shaft 10 with a radius δ. 16 is an orbiting scroll 13
The balance weight is provided on the rotating shaft 10 to balance the eccentric rotation of the.

Reference numeral 17 denotes a fixed scroll fixedly provided at the open end of the large-diameter cylindrical portion 9C of the casing 9, and the fixed scroll 17 is provided so as to have the same axis as the axis O ₁ -O ₁ of the rotary shaft 10. There is. Here, the fixed scroll 17 includes an end plate 17A and the end plate 1A.
7A is formed in an involute or a spiral shape close to the involute, and is arranged so as to overlap the wrap portion 13B of the orbiting scroll 13, and a plurality of compression chambers 18, 1 are provided between them.
8, a wrap portion 17B forming the wrap portion 17B, a peripheral wall portion 17C formed so as to surround the wrap portion 17B, and a large-diameter cylindrical portion 9C open end of the casing 9 that extends in a radial direction from a tip portion of the peripheral wall portion 17C A flange portion 17D to which is firmly attached, a suction passage forming portion 17E which is formed so as to radially project to a side surface side of the peripheral wall portion 17C, and which has the same axis as the suction passage forming portion 9G of the casing 9, and the peripheral wall portion. An oil passage forming portion 17F formed on the lower surface side of 17C and having the same axis as the oil passage forming portion 9H of the casing 9, and an oil injection hole 22, which will be described later, located on the side opposite to the lap of the end plate 17A (back surface). The oil supply hole 23 and a groove forming wall 17G which is formed in a V shape so as to surround the opening of the oil passage 34 and which fits into a cover 24 side oil passage 25 described later.

Reference numeral 19 denotes a suction port formed in the suction port forming portion 9F of the casing 9, and 20 denotes a suction passage forming portion 17 of the casing 9 and the fixed scroll 17 so that the suction port 19 communicates with the compression chamber 18.
A suction passage formed to extend horizontally in E is shown, a suction filter (not shown) is provided at the suction port 19, and the suction passage 20 is formed at the rightmost outermost peripheral side. It opens in the compression chamber 18 and sucks external air while the orbiting scroll 13 orbits. On the other hand, 21 is a discharge port formed at a substantially central position of the end plate 17A of the fixed scroll 17, from the discharge port 21 the air compressed in the innermost compression chamber 18 the discharge port 26 of the cover 24 side. The oil is discharged into the oil separation tank 1 via the oil.

Reference numeral 22 denotes an oil injection hole as an oil supply hole formed in the end plate 17A of the fixed scroll 17, 23 denotes an oil supply hole similarly formed in the peripheral wall portion 17C of the fixed scroll 17, and the oil injection hole 22 is '' In the oil passage surrounded by the groove forming wall 17G, and formed in the bent portion of the groove forming wall 17G so as to be in the vicinity of the discharge port 21, and open to the compression chamber 18 located in the middle, The compression chamber
By injecting oil into 18, the lap portions 13B and 17B are sealed and lubricated. On the other hand, the oil supply hole 23 is formed at the upper end of the oil passage surrounded by the groove forming wall 17G, and is formed on the sliding surface between the end plate 13A of the orbiting scroll 13 and the peripheral wall 17C end surface of the fixed scroll 17. It is designed to lubricate and seal.

Next, reference numeral 24 denotes a cover fixedly attached to the end surface of the fixed scroll 17 opposite to the end plate 17A of the end plate 17A.
As shown in the figure, it has a “<” shape that bends in the vicinity of the discharge port 21 so as to correspond to the groove forming wall 17G of the fixed scroll 17.
An oil passage 25 formed independently of the discharge port 21 as a fluidly separate member and a mixture of compressed air and oil discharged from the discharge port 21 of the fixed scroll 17 are directed obliquely upward. It is composed of a discharge port 26 for discharging. The cover 24 is attached to the end surface of the fixed scroll 17 opposite to the end plate 17A so that the oil passage 25 is fitted to the outer periphery of the groove forming wall 17G, and the discharge passages 21, 26 from the oil passage 34 inside. An oil passage is formed to reach the oil injection hole 22 and the oil supply hole 23 through the vicinity.

Further, 27 is a filter chamber formed in the valve / filter mounting portion 9E of the casing 9, and the filter chamber 27 is the tank main body 2
Oil separation tank 1 through oil passage hole 28 communicating with oil passage hole 5 of
An oil filter 29 is housed inside in communication with the oil filter 29, and the oil filter 29 is exchangeably fixed by a lid 30. Further, 31 is a valve mounting hole formed in the valve / filter mounting portion 9E in the horizontal direction, and 32 is the valve mounting hole 31 in the filter chamber 27.
And a valve mechanism 33 such as a temperature control valve for adjusting the amount of oil flowing to an oil cooler (not shown) according to the oil temperature in the valve mounting hole 31. Is provided. Reference numeral 34 denotes an oil passage formed in the oil passage forming portion 9H of the casing 9 and the oil passage forming portion 17F of the fixed scroll 17 so as to extend in the horizontal direction. One end 34A of the oil passage 34 is opened in the valve mounting hole 31. The other end 34B is open at the lower end of the groove forming wall 17G of the fixed scroll 17.

In the figure, reference numeral 35 denotes an oil supply port formed at the rear end of the bearing portion 9A of the casing 9 for supplying oil to the bearing 11, and 36 denotes a mechanical seal provided at the rear end of the bearing portion 9A.

The present embodiment is configured in this way, and its operation will be described next.

Now, when the motor mounted on the oil separation tank 1 or the like is rotationally driven, the rotation is transmitted to the rotary shaft 10 via the pulley 12, and the rotary shaft 10 orbits the orbiting scroll 13. Then, the orbiting scroll 13 is guided by the Oldham coupling 15 and makes a relative circular motion having a radius δ with respect to the fixed scroll 17.

As a result, the air sucked from the suction port 19 opened to the outside of the oil separation tank 1 reaches the outermost compression chamber 18 via the suction passage 20 and is gradually compressed from the outer compression chamber 18 to the innermost circumference. After being raised to a predetermined pressure while moving to the side compression chamber 18, the oil is discharged into the oil separation tank 1 through the discharge port 21 of the fixed scroll 17 and the discharge port 26 of the cover 24 together with the oil. Then, after the oil content is removed by the oil separation filter 6 provided in the oil separation tank 1, the purified compressed air is supplied to the outside from the discharge hole 7.

At this time, since the discharge port 26 formed in the cover 24 is configured to open obliquely upward, it is possible that the compressed air directly collides with the oil separation filter 6 and damages the oil separation filter 6. In order to prevent this, the discharge direction is limited, and the compressed air discharged from the discharge port 21 of the fixed scroll 17 is made to collide with the wall surface of the cover 24, thereby making the collision separation action of the oil mist good.

Further, during the compression operation, the inside of the oil separation tank 1 is raised to a predetermined pressure set by a safety valve (not shown), so that the lubricating oil 4 stored in the oil separation tank 1 is oiled by its internal pressure. The oil is forcibly supplied into the oil passage 25 through the holes 5, 28, the filter chamber 27, the oil filter 29, the oil passage 32, the valve mounting hole 31, and the oil passage 34. At this time, since the oil passage 34 is horizontally formed so as to directly penetrate the casing 9 and the fixed scroll 17, the lubricating oil 4 flowing in the oil passage 34 is
It is designed to flow smoothly without pressure loss. Also,
The flow rate of the lubricating oil 4 at this time is adjusted to an appropriate flow rate by the throttle valve that constitutes the valve mechanism 33.

Further, the lubricating oil 4 that has reached the oil passage groove 25 is raised in the oil passage groove 25 by the internal pressure and flows through the fixed scroll 17 toward the oil supply hole 23 toward the oil supply hole 23. Cool from the side (back), especially the innermost compression chamber 18
Is supplied so as to fill the inside of the oil passage groove 25 while cooling the vicinity of the discharge port 21 having the highest temperature.

As a result, the lubricating oil 4 in the oil passage 25 is first injected into the compression chamber 18 through the oil injection hole 22 which has a large resistance during oil supply in order to supply the intermediate compression chamber 18 in the compression process. Is
Orbiting scroll 13 and fixed scroll by the lubricating oil 4
Lubrication, sealing, and cooling are performed between the respective lap portions 13B and 17B of 17 and then the end plate 13A of the orbiting scroll 13 and the fixed scroll 17 are supplied from the oil supply hole 23, which has a smaller resistance during oil supply than the oil injection hole 22. The lubricating oil 4 is supplied to the sliding surface portion between the peripheral wall portion 17C and the peripheral wall portion 17C, and lubrication and sealing of these are performed. The lubricating oil 4 is also supplied from the oil supply port 35 of the casing 9 to lubricate the bearings 11, the swivel bearing 14, the Oldham coupling 15, and the like.

Then, the lubricating oil 4 supplied to each part as described above
Is discharged into the oil separation tank 1 together with the compressed air, and the lubricating oil 4 in the oil separation tank 1 is cooled by an oil cooler provided separately.

Thus, according to this embodiment, the fixed scroll 17 has
An oil injection hole 22 for supplying the lubricating oil 4 and an oil supplying hole 23 for supplying the lubricating oil 4 between the end plate 13A of the orbiting scroll 13 are provided in the intermediate compression chamber 18 in the compression process, and the fixed scroll is also provided. A cover 24 having a V-shaped oil passage groove 25 extending from the oil injection hole 22 to the oil supply hole 23 through the vicinity of the discharge port 21 on the side opposite to the wrap portion 17 is formed independently of the discharge port 21. The casing 9 and the fixed scroll 17 are provided in the oil passage 25 of the cover 24.
The lubricating oil 4 in the oil separation tank 1 is forcibly supplied by the internal pressure through an oil passage 34 or the like which penetrates the oil separation tank 1 in the horizontal direction and opens in the oil separation tank 1.

Therefore, without using any external oil pipe such as a capillary tube, the lubricating oil 4 in the oil separation tank 1 is shortest from the oil passage 34 to the oil injection hole 22 and the oil supply hole 23 through the oil passage 25. Can be supplied in a stable condition without pressure loss,
A compact scroll compressor without piping can be provided, and a seizure accident between the laps 13B and 17B due to insufficient lubrication can be reliably prevented, and reliability and life can be improved.

Further, when the lubricating oil 4 in the oil passage 25 is supplied, the order of supplying the lubricating oil 4 is set in consideration of the pressure increase of each compression chamber 18 from the outer peripheral portion toward the inner peripheral side. By supplying the oil injection hole 22 having a high resistance and the oil injection hole 23 having a low resistance at the time of refueling in this order, most of the lubricating oil 4 is injected from the first oil injection hole 22. Since it is prevented by the difference, the lubricating oil 4 can be surely supplied to the oil supply hole 23, and it is possible to supply oil to the whole and prevent occurrence of seizure accidents and reduction in compression efficiency, thereby improving reliability. It can be further improved.

Further, the fixed scroll 17 can be cooled from the side opposite to the wrap of the end plate 17A by the lubricating oil 4 flowing in the oil passage 25 independent of the discharge port 21, and in particular, the compression chamber 18 at the innermost circumference where the pressure becomes high.
As a result, it is possible to effectively cool the vicinity of the discharge port 21 having a high temperature and further improve the life. Further, the oil injection hole 22 and the oil supply hole can be formed only by appropriately forming the shape of the oil passage 25.
It is possible to appropriately select the drilling positions such as 23 and the number of drilling holes, and to make the oil passage into a manifold.

Furthermore, as described above, the piping, joints, etc. are not required, the configuration can be simplified, and the oil passage 25, the oil passage 34, etc. can be formed without requiring complicated processing. The manufacturing cost can be significantly reduced by improving the property.

Further, the throttle valve for adjusting the flow rate, the valve mechanism 33 such as the temperature control valve for the oil cooler, and the oil filter 29 can be arranged outside the oil separation tank 1. The main body 8 can be used without being disassembled.

Further, the cover 24 is formed with the discharge port 26 for limiting the discharge direction of the compressed air to prevent the compressed air from directly colliding with the oil separation filter 6, so that the oil separation filter 6 is prevented from being damaged. Further, the compressed air discharged from the discharge port 21 of the fixed scroll 17 is made to collide with the wall surface of the cover 24, and the collision separation action of the oil mist can be improved.

Although the oil passage groove 25 of the cover 24 is described as being formed in a V shape in the embodiment, the position and number of the oil injection hole 22, the oil supply hole including the oil supply hole 23, the oil passage 34, etc. may be changed. A manifold having an appropriate shape such as a “Y” shape or an “S” shape can be formed.

〔The invention's effect〕

As described in detail above, in the oil-cooled scroll compressor according to the present invention, the end plate of the fixed scroll is provided with an oil injection hole for supplying oil to the oil supply portion of the intermediate compression chamber, and is provided on the outer periphery of the fixed scroll. Is provided with an oil supply hole for supplying oil between the end plate of the orbiting scroll, and an oil passage, which extends from the oil injection hole to the oil supply hole, is formed on the side surface of the fixed scroll opposite to the wrap independently of the discharge port. A cover is provided, and the oil in the oil separation tank is supplied to the oil passage of the cover through an oil passage that penetrates the casing and the fixed scroll and opens into the oil separation tank. , An appropriate oil passage can be formed in the shortest distance without using a joint, a seal member, etc., and the configuration can be simplified, and an oil passage can be formed by an easy process, Improves productivity by improving assembly It can be reduced.

In addition, by connecting the oil injection hole, the oil supply hole and the oil separation tank at the shortest distance through the oil passage that penetrates the casing and the fixed scroll, the pressure loss during oil supply is reduced and the oil separation tank Since the oil is forcibly supplied into the oil passage groove of the cover by pressure, the oil in the oil passage groove is supplied in the order of the oil injection hole with the highest resistance and the oil hole with the lowest resistance when refueling. , It is possible to prevent most of the supplied oil from being injected from the oil injection hole, and it is possible to stably supply oil to each oil supply point, and it is possible to reliably prevent seizure between laps due to insufficient oil supply. Can be prevented, and reliability and life can be improved.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an oil-cooled scroll compressor according to this embodiment, FIG. 2 is a vertical sectional view of a compressor body, and FIG. 3 is a plan view showing a side surface of a fixed scroll opposite to a wrap portion. [Fig. 4] is a plan view of a cover. 1 ... Oil separation tank, 4 ... Lubricating oil, 7 ... Discharge hole, 8
...... Compressor body, 9 …… Casing, 10 …… Rotary shaft, 10
A ... Crank, 13 ... Orbiting scroll, 13A ... End plate,
13B: Wrap part, 17 ... Fixed scroll, 17A ... End plate, 17B ... Wrap part, 18 ... Compression chamber, 19 ... Suction port, 2
0 …… Suction passage, 21,26 …… Discharge port, 22 …… Oil injection hole, 23
...... Lubrication hole, 24 ...... Cover, 25 ...... Oil groove, 29 ...... Oil filter, 32,34 ...... Oil passage, 33 ...... Valve mechanism.

Claims (1)

[Claims] 1. An oil separation tank for storing oil, a casing horizontally installed in the oil separation tank so that an axis of the oil separation tank is in a horizontal direction, a shaft rotatably supported by the casing, and a tip portion of the oil separation tank. A rotary shaft that is a crank located in the casing, a rotary scroll that is rotatably attached to the crank of the rotary shaft, and a spiral wrap portion is provided on the end plate,
A fixed scroll fixed to the casing and provided with a spiral wrap portion that overlaps the wrap portion of the orbiting scroll and forms a compression chamber on the end plate, and the fixed scroll is bored in the center side of the end plate and has an innermost circumference. The discharge port communicating with the compression chamber on the side and the end plate of the fixed scroll, and supplies oil to the oiling portion of the intermediate compression chamber of the compression chambers formed between the fixed scroll and the orbiting scroll. An oil injection hole that is formed on the outer peripheral side of the fixed scroll, and an oil supply hole that supplies oil between the end plate of the orbiting scroll;
A cover in which an oil passage from the oil injection hole to the oil supply hole is formed independently of the discharge port, one end side is opened in the oil in the oil separation tank, and the other end side is the casing and the fixed scroll. An oil-cooled scroll compressor comprising an oil passage that penetrates and communicates with an oil passage of the cover.