JPH08247056A - Scroll air compressor - Google Patents

Abstract

PURPOSE: To prevent the temperature rise of the compressed air without mixing oil in the compressed air by partitioning the high pressure side formed with a rotary scroll and a fixed scroll into a discharge chamber serving as a passage of the compressed air and a water chamber serving as a passage of cooling water. CONSTITUTION: A U-shaped partition wall 36 on the plan view is integrally formed inside the cover section 2a of a cup-like main body 2 constituted of the sealed housing 1 of a scroll compressor and a front end plate 4, and it is closely stuck to an end plate 11. A discharge chamber 31 formed with the end plate 11 and the sealed housing 1 is partitioned into a discharge chamber 37 on the inside of the partition wall 36 and a water chamber 38 on the outside. Cooling water is fed into the water chamber 38 through a cooling water inlet pipe 42, flows out from a cooling water outlet pipe 43, and cools the compressed air via the heat exchange with the compressed air discharged through the discharge chamber 37 during the operation. An oil injection mechanism can be abolished, and the problem that oil is mixed in the compressed air can be resolved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type compressor.

[0002]

2. Description of the Related Art FIG. 3 is a vertical sectional view of a conventional scroll type compressor. In the figure, reference numeral 1 denotes a hermetic housing, which comprises a cup-shaped main body 2 and a front end plate 4 fastened thereto by bolts 3. Reference numeral 7 denotes a rotating shaft which penetrates the front end plate 4 and is rotatably supported by the front end plate 4 via bearings 8 and 9.

A fixed scroll 1 is provided in the closed housing 1.
0 and the orbiting scroll 14 are provided. The fixed scroll 10 includes an end plate 11 and a spiral wrap 12 provided upright on the inner surface of the end plate 11, and the end plate 11 is fastened to the cup-shaped body 2 by a bolt 13. Orbiting scroll 1
4 is an end plate 15 and a spiral wrap 1 which is erected on the inner surface of the end plate 15.
6, the spiral wrap 16 is a fixed scroll 1
It has substantially the same shape as the zero spiral wrap 12. The orbiting scroll 14 and the fixed scroll 10 are eccentric to each other by the orbiting orbiting radius, and are meshed with each other with an angle of 180 ° as shown in the figure. As a result, the front end surface of the spiral wrap 12 closely contacts the inner surface of the end plate 15, the front end surface of the spiral wrap 16 closely contacts the inner surface of the end plate 11, and the side surfaces of the spiral wraps 12 and 16 Make line contact with each other at a plurality of points. Thus, the plurality of spiral compression chambers 19a, 19b, which are substantially point-symmetric with respect to the centers of the spirals of the spiral wraps 12, 16, are limited, and the small chamber 22 is limited at the center of the spirals.

A drive bush 21 is rotatably fitted in a cylindrical boss 20 projecting from the central portion of the outer surface of the end plate 15 through a swivel bearing 23, and the drive bush 21 is bored in the drive bush 21. In the eccentric hole 24, an eccentric pin 25 protruding from the inner end surface of the rotary shaft 7 is rotatably fitted. Further, a rotation prevention mechanism 26 and a thrust bearing 27 are arranged between the outer peripheral edge of the outer surface of the end plate 15 and the inner surface of the front end plate 4. The end plate 11 has a small hole 32 penetrating the outer surface thereof and the spiral compression chambers 19a and 19b. Then, bosses 33 protruding inward are integrally formed at two positions of the lid portion 2a of the cup-shaped main body 2, a through hole 34 is formed at the center thereof, and an oil supply pipe 35 is provided outside.
Are joined. The inner end surface of the boss 33 is O (not shown).
The oil supply pipe 35 is sealed with the outer surface of the end plate 11 by a ring or the like, and the oil supply pipe 35 is inserted through the through hole 34 and the small hole 33.
It is in communication with 9a and 19b.

However, when the rotating shaft 7 is rotated, the orbiting scroll 14 is driven via the eccentric pin 25, the drive bush 21, the orbiting bearing 23, and the boss 20, and the orbiting scroll 14 is rotated by the rotation preventing mechanism 26. While being blocked, the revolution radius, that is, the rotating shaft 7 and the eccentric pin 2
The orbital motion is performed on a circular orbit having a radius of eccentricity with respect to 5. Then, the line contact portion between the spiral wraps 12 and 16 gradually moves toward the center of the spiral, and as a result, the spiral compression chambers 19a and 19b move toward the center of the spiral while reducing the volume. Along with this, the air that has flowed into the suction chamber 28 through the suction port 40 is taken into the spiral compression chambers 19a and 19b from the outer end openings of the spiral wraps 12 and 16, and is compressed while being compressed into the central small chamber 22. To the discharge port 2 formed in the end plate 11 of the fixed scroll 10 from here.
The discharge valve 30 is pushed open through 9 and discharged into the discharge chamber 31 which is limited by the end plate 11 and the closed housing 1, and then flows out through the discharge pipe 41.

Air generates a high temperature during the adiabatic compression process as described above. Therefore, oil, which also serves as a lubricant and a seal, is injected from the oil supply pipe 35 into the spiral compression chambers 19a and 19b through the through hole 34 and the small hole 32, is sent, is cooled, is brought close to the isothermal compression, and the increase of the compression power is suppressed. . Vortex compression chamber 19
The oil injected into the a and 19b cools the compressed air, becomes a mist, and flows out from the discharge port 41 together with the compressed air.
Then, it is separated from the compressed air by an oil separator and an oil cooler (not shown), cooled, and returned to the oil supply pipe.

[0007]

In the conventional scroll type air compressor described above, in order to prevent the temperature rise of the compressed air due to the compression process in the spiral compression chambers 19a, 19b, the oil inside the spiral compression chambers 19a, 19b is prevented. Is sprayed and it is cooled. For this reason, oil is mixed with the compressed air discharged from the compressor in the form of mist and flows out, so that the oil is once passed through an oil separator to separate and remove the oil before being supplied to the customer. However, since it is difficult to completely separate and remove oil, there is a problem in that it is difficult to use especially in the fields of medical care, food, etc. where mixing of oil is disliked.

The present invention solves the above-mentioned drawbacks of the prior art and provides a scroll type air compressor for cooling compressed air without mixing oil in the compressed air.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, in which an orbiting scroll meshing with a fixed scroll fixed in a hermetic housing is caused to revolve while orbiting while preventing its rotation. In a scroll type air compressor in which the closed housing is partitioned into a high pressure side and a low pressure side by an end plate of a fixed scroll,
The present invention relates to a scroll type air compressor having the following features. (1) The high-pressure side was partitioned into a discharge chamber serving as a compressed air flow passage and a water chamber serving as a cooling water flow passage. (2) The discharge chamber is formed by a partition wall provided in a U shape inside the housing so as to include a discharge port provided at the center of the fixed scroll end plate. (3) A cooling water inlet is provided at one end of the water chamber and a cooling water outlet is provided at the other end. (4) The connection ports for the compressed air discharge pipe, the cooling water inlet pipe, and the cooling water outlet pipe are provided on the outer peripheral side of the sealed housing.

[0010]

Since the present invention has the above configuration,
By circulating the cooling water in the water chamber partitioned on the high pressure side during operation of the compressor, the heat of the compressed air in the spiral compression chamber and the suction chamber on the low pressure side moves to the cooling water through the end plate of the fixed scroll. , Compressed air can be cooled.

[0011]

1 is a vertical sectional view of a scroll type air compressor according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II of FIG. 1 and 2, reference numeral 36 denotes a partition wall integrally formed inside the lid portion 2a of the cup-shaped main body 2. The inner end surface of the partition wall is in close contact with the outer surface of the end plate 11 by an O-ring, packing and the like not shown. As a result, the conventional discharge chamber 31 has a discharge chamber 37 inside the partition wall 36,
It is partitioned into a water chamber 38 outside the partition wall 36. Reference numeral 41 is a compressed air discharge pipe, 42 is a cooling water inlet pipe connected to one end of the water chamber 38, and 43 is a cooling water outlet pipe connected to the other end of the water chamber 38. By adopting the above configuration, the conventional oil injection mechanism is abolished. The configuration and operation of the parts other than the above are the same as those of the conventional technique (FIG. 3), and corresponding members are designated by the same reference numerals.

In the present apparatus, during the operation of the compressor, the cooling water is sent into the water chamber 38 through the cooling water inlet pipe 42 and flows out from the cooling water outlet pipe 43. The cooling water is in contact with the compressed air in the spiral compression chambers 19a, 19b and the suction chamber 28 via the end plate 11, heat conduction occurs between them, and heat is transferred from the compressed air to the cooling water. Aluminum alloy is used as the material of the fixed scroll 10, and its thermal conductivity is large, so that the amount of heat transfer is large and the compressed air can be sufficiently cooled. As a result, the conventional oil injection mechanism can be abolished, it is possible to completely eliminate the mixing of oil in compressed air, and it can be easily used in the fields such as medical and food, which were difficult to use in the past. Become.

[0013]

In the scroll type air compressor of the present invention, the high-pressure side is partitioned into a discharge chamber that serves as a passage for compressed air and a water chamber that serves as a passage for cooling water, and the cooling water is circulated in the water chamber. As a result, the compressed air in the spiral compression chamber or the suction chamber is cooled, so that the temperature rise of the compressed air can be prevented without mixing oil in the compressed air.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a scroll type air compressor according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG.

FIG. 3 is a vertical sectional view of a conventional scroll compressor.

[Explanation of symbols]

 2 cup-shaped main body 2a lid part of cup-shaped main body 11 end plate of fixed scroll 19a, 19b compression chamber 28 suction chamber 36 partition wall 37 discharge chamber 38 water chamber 41 discharge pipe 42 cooling water inlet pipe 43 cooling water outlet pipe

Claims (4)

[Claims] 1. An orbiting scroll that meshes with a fixed scroll fixed in a hermetic housing is caused to revolve while revolving, and end plates of the fixed scroll move the high pressure side and the low pressure side inside the hermetic housing. A scroll-type air compressor having a partition, wherein the high-pressure side is partitioned into a discharge chamber serving as a compressed air passage and a water chamber serving as a cooling water passage. 2. The discharge chamber is formed by a U-shaped partition wall provided inside the housing so as to include a discharge port provided at the center of the fixed scroll end plate. The scroll type air compressor according to claim 1. 3. The scroll air compressor according to claim 2, wherein a cooling water inlet is provided at one end of the water chamber and a cooling water outlet is provided at the other end. 4. The scroll type air compressor according to claim 3, wherein the connection ports of the compressed air discharge pipe, the cooling water inlet pipe, and the cooling water outlet pipe are provided on the outer peripheral side of the hermetic housing.