JPH0763180A - Lysholm type compressor - Google Patents

Abstract

PURPOSE:To reduce an area and an amount of heat generation in the case of contact of a rotor by providing a chevron-shape rugged part on at least one end face on an air discharge side of respective male and female rotors in a Lysholm type compressor. CONSTITUTION:On end faces on air discharge sides of a male rotor 1 and a female rotor 2 stored inside a casing 3, chevron-shape rugged parts 21, 22 radially extending toward outer circumferences of respective rotors are arranged from the circumferential sides of respective rotor shaft parts 6, 8. Assembly is carried out so that the predetermined clearance is kept between the inside face of the casing 3 facing the air discharge side end faces of the rugged parts 21, 22 and the projecting part point parts of the rugged parts 21, 22. Therefore, a contact area is reduced when both rotors 1, 2 and the casing 3 are brought into contact with each other, and radiation of generated heat is facilitated, while the clearance between them is automatically maintained.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art FIG. 4 and FIG. 5 show an outline of a Risholm type compressor.
And a mountain portion 1 of the male rotor 1 on the peripheral surface.
a and a female rotor 2 having a plurality of spiral valleys 2a that mesh with each other are rotatably housed inside a casing 3 in a state of being meshed with each other, and the male rotor 1 and the female rotor 2 are in the direction of arrow a in FIG. The air 4 is sucked from one end side in the axial direction by being rotated to, compressed between the male rotor 1 and the female rotor 2, and can be discharged from the other end side. 1 and the female rotor 2 have rotor shaft portions 5, 6 and 7, 8 projecting from both ends in the axial direction of the bearing 9,
It is supported by the casing 3 via 10 and 11, 12. In the figure, 13 is an input shaft that is rotated in conjunction with an output shaft of an engine (not shown). The rotation of the input shaft 13 is performed by a speed increasing gear 14, a speed increasing pinion 15, a female rotor side timing gear 16, It is adapted to be transmitted to the male rotor 1 and the female rotor 2 via a speed increasing device 18 composed of a male rotor side timing gear 17.

Further, in the above-mentioned Rishorum type compressor, in order to improve the compression efficiency, there is almost no clearance between the respective end faces of the male rotor 1 and the female rotor 2 on the air discharge side and the inner face of the casing 3 facing the respective end faces. Assemble so that there is no

[0004]

However, in the above-mentioned Rishorum compressor, the end faces of the male rotor 1 and the female rotor 2 on the air discharge side and the inner face of the casing 3 facing the end faces are formed by planes. Therefore, when both surfaces are in contact with each other, a large amount of heat is generated and the generated heat is difficult to dissipate. Therefore, the rotors 1 and 2 are welded to the casing 3 and the inner surface of the casing 3 and the end surfaces of the rotors 1 and 2 are welded. There was a problem that seizure was likely to occur during the process.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a Rishorum type compressor capable of reducing the area and heat generation amount in the case of contact by providing unevenness on the end surface of each rotor. Is.

[0006]

According to the present invention, there is provided a male rotor having a plurality of spiral crests on its peripheral surface, and a female rotor having a plurality of spiral troughs meshing with the crests of the male rotor on its peripheral surface. A structure in which the rotor and the rotor are engaged with each other and housed in the casing, the male rotor and the female rotor are rotationally driven to suck air from one end side in the axial direction, compress between both rotors, and discharge from the other end side. In the Rishorum compressor described above, the male rotor and the female rotor each have at least one end face on the air discharge side with mountain-shaped irregularities.

[0007]

Therefore, according to the present invention, when the end surface of the male rotor or the female rotor provided with the mountain-shaped unevenness comes into contact with the inner surface of the casing, the convex portion of the end surface comes into contact, so that the contact area is reduced and The parts are prematurely worn to automatically maintain the gap between the inner surface of the casing and the end surface of each rotor.

[0008]

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

FIGS. 1 to 3 are sectional views showing the outline of an embodiment of the L'Isholm type compressor of the present invention, in which the same parts as those in FIGS. 4 and 5 are designated by the same reference numerals.

In this embodiment, a plurality of spiral crests 1a provided on the peripheral surface of the male rotor 1 and a plurality of spiral troughs 2a provided on the peripheral surface of the female rotor 2 are meshed with each other. In a state in which the male rotor 1 and the female rotor 2 rotatably housed inside the casing 3 extend radially from the peripheral side of the rotor shaft portions 6 and 8 toward the outer periphery of each rotor on the end faces on the air discharge side. The unevenness 21 and 22 of the
Between the inner surface of the casing 3 facing the air discharge side end surface of the male rotor 1 provided with the concave and convex portions and the air discharge side end surface of the female rotor 2 provided with the concave and convex portions 22, and the tip end portions of the convex portions of the concave and convex portions 21 and 22. It is assembled so that a predetermined clearance is maintained, and is formed so as to improve compression efficiency.

Other than the above, there is no difference from the conventional Risholm type compressor shown in FIGS. 4 and 5, so the following description will be omitted. .

According to the above, when the air discharge side end surface of the male rotor 1 provided with the unevenness 21 or the female rotor 2 provided with the unevenness 22 comes into contact with the inner surface of the casing 3, the respective convex portions of the end surface come into contact with each other. As a result, the contact area is reduced, and the amount of heat generated is reduced because the protrusions are worn early.
As a result, the surface area of the end surface increases, so that the generated heat is easily dissipated, and further, the gap between the inner surface of the casing 3 and each end surface of the male rotor 1 and the female rotor 2 is automatically maintained due to the wear of the tip of the contacting convex portion. It

In the above-described embodiment, the case where the irregularities 21 and 22 are provided on the end faces of the male rotor 1 and the female rotor 2 on the air discharge side has been described, but the male rotor 1 and the female rotor 2 are described.
When each end face of the air inflow side also contacts the inner face of the casing 3, the end faces of the air inflow side of the male rotor 1 and the female rotor 2 may be provided with irregularities, and otherwise, the scope of the present invention is not deviated. It goes without saying that various changes can be made within the range.

[0014]

According to the Rishorum compressor of the present invention, when the air discharge side end surface of the male rotor or the female rotor provided with the unevenness comes into contact with the inner surface of the casing, the respective convex portions of the end surface come into contact with each other. The area is reduced, and the amount of heat generated is reduced due to early wear of the convex portion, the surface area of the end face increases due to the unevenness, and thus the generated heat is easily dissipated. Various excellent effects can be obtained, such as automatically maintaining the gaps between the inner surface and the end surfaces of the male rotor and the female rotor.

[Brief description of drawings]

FIG. 1 is a cross-sectional view schematically showing an embodiment of a Rishorum compressor of the present invention.

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

FIG. 3 is a view taken along the line III-III in FIG.

FIG. 4 is a cross-sectional view schematically showing an example of a conventional Rishorum compressor.

5 is a schematic perspective view showing the principle of the Rishorum type compressor related to FIG. 4; FIG.

[Explanation of symbols]

 1 Male Rotor 1a Mountain Part 2 Female Rotor 2a Valley Part 3 Casing 21 Concavo-convex 22 Concavo-convex

Claims (1)

[Claims] 1. A casing in which a male rotor having a plurality of spiral crests on its peripheral surface and a female rotor having a plurality of spiral troughs that mesh with the crests of the male rotor are meshed with each other. In the Rishorum compressor, the male rotor and the female rotor are housed inside and the air is sucked from one end side in the axial direction to be compressed, and the two rotors can be compressed and discharged from the other end side. And a female rotor in which at least one end face on the air discharge side is provided with mountain-shaped irregularities, a Rishorum compressor.