JPH0151909B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a scroll fluid machine.

[Conventional technology]

Conventionally, in a scroll fluid machine, a soft material or a self-lubricating material is attached to at least one of the groove section of both scrolls and the head of a wrap section, and each end plate section of both scrolls is equipped with at least one of the sliding surfaces. Some are equipped with wear-resistant or self-lubricating materials. There is also a type in which the sliding surfaces of both scrolls are hard alumite treated and plated with copper or lead bronze. All of these are intended to improve the sliding life. Furthermore, JP-A-54-157315 discloses that the entire or part of the surface of the wrap and end plate of the scroll is made of a familiar material that is easily worn, and that the lower layer is a hardened layer. .

[Problem to be solved by the invention]

Most of the above conventional technologies focus on either wear resistance or self-lubricating properties, but in scroll fluid machines, damage to sealing and moving parts directly affects performance, so 54−
There are also some that take into consideration abrasion resistance and conformability, as described in Japanese Patent No. 157315. However, with these conventional techniques, the hardened layer can only be formed at a uniform depth, so the wear resistance of the end plate, which is exposed to high surface pressure and high circumferential speed, must be met. When a hardened layer is formed, other parts are easily distorted, and post-processing is required.

An object of the present invention is to provide a scroll fluid machine which is economically advantageous and has improved wear resistance and sealing effect by forming a surface treatment layer with small deformation.

[Means for Solving the Problems] An object of the present invention is to combine an orbiting scroll and a fixed scroll having an end plate portion and a wrap portion standing upright with respect to the end plate portion so that the wrap portions mesh with each other, In a scroll fluid machine that rotates a fixed scroll so that it does not appear to rotate, the end plate of the fixed scroll, a part or the entire surface of the end plate of the orbiting scroll, and the tip of the wrap formed in a spiral shape are treated by induction hardening. This is achieved by providing a hardened surface layer formed by locally heating and quenching to vary the depth of the hardened layer, and a conforming layer formed by chemical conversion treatment on this hardened surface layer.

[Effect]

The sliding parts of both scrolls in a scroll fluid machine are subjected to high surface pressure and circumferential speed, and damage to the sliding parts directly affects performance, so wear resistance and machining accuracy errors are important. It is advantageous to form a surface treatment layer with a relaxing conformability. The hardened layer plays a role in preventing further wear after being blended in, and since the hardened layers come into contact with each other and move, it is desirable that the deformation and surface roughness after the hardening treatment be small. In the formation of the surface hardening layer by induction hardening mentioned above, the hardening depth can be locally changed and the treatment can be divided into several stages, so by appropriately adjusting this, the hardening layer can be Since deformation can be kept small, wear resistance is improved, and the breaking-in layer improves initial breaking-in and sealing performance associated with breaking-in.

〔Example〕

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

FIG. 1 shows an embodiment of the present invention. In this figure, 10, 11, 12 are lap grooves 1a, lap 1b of a fixed scroll 1 made of iron-based material.
and a surface treatment layer formed by subjecting the sliding surface of the mirror plate portion 1c to surface treatment. This surface treatment layer forms a conforming layer by a chemical conversion treatment called reubrite treatment, which is a phosphoric acid film treatment using phosphate. This conforming layer is formed when free phosphoric acid in the solution acts on the iron surface, and phosphate is deposited on the iron surface to form a film.
In addition, in areas where wear resistance is required, a second
As shown in the figure, surface hardening hard layer 5 by induction hardening
is formed. In FIG. 1, 3 is an inlet port, and 4 is a discharge port.

Figure 3 shows that surface hardening layers 5 and 7 are formed on both scrolls 1 and 2, respectively, and a conforming layer 1 is formed thereon.
2 was formed. A deep surface hardening layer 5 is formed on the end plate part of the fixed scroll where distortion is less likely to occur, and a hardened surface layer 5 is formed on the end plate part 7 of the orbiting scroll where distortion is more likely to occur.
A slightly shallow hardened surface layer 7 is formed on the surface. Although not shown, a shallow surface hardening layer can be formed in the lap grooves 2a and 2b of the orbiting scroll 2. Unlike carburizing and quenching and nitriding, the surface hardening layer is produced by induction hardening, and therefore a conforming layer can be easily obtained by the chemical conversion treatment.

With this configuration, for example, 10μ
When a conforming layer of m is formed, both scrolls will have approximately
Accommodates up to 20μm. For this reason, the surface roughness is 10 μm.
If it is below, the sealing performance will be significantly improved. As mentioned above, induction hardening requires wear resistance,
Since the depth of the hardened layer can be locally changed in consideration of the ease of strain, deformation due to processing can be reduced, and post-processing can be omitted if the conforming layer of the reubrite-treated layer is taken into account. Therefore, it not only improves the sealing effect and wear resistance due to conformability, but also
It is also effective from an economic point of view.

〔Effect of the invention〕

As explained above, according to the present invention, the depth of the hardened surface layer can be locally changed by induction hardening on the sliding surfaces of the fixed scroll and the orbiting scroll, and the hardening can reduce deformation and reduce post-processing. Since it can be omitted, a surface hardening layer is obtained which is economically advantageous and which is suitable for the sliding properties. Further, by performing a chemical conversion treatment such as reubrite treatment, a scroll fluid machine with improved conformability can be obtained.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of the present invention, FIG. 2 is a partial sectional view of the embodiment shown in FIG. 1, and FIG. 3 is a partial sectional view of another embodiment of the invention. 1... fixed scroll, 2... orbiting scroll, 5, 7... induction hardening, 12... conforming layer.

Claims (1)

[Claims] 1. A scroll in which an orbiting scroll and a fixed scroll each having an end plate part and a lap part standing upright with respect to the end plate part are combined so that the lap parts are engaged with each other, and the orbiting scroll is turned so as not to apparently rotate relative to the fixed scroll. In fluid machinery, the end plate of a fixed scroll, a part or the entire surface of the end plate of an orbiting scroll, and the tip of a spirally formed wrap are locally heated and rapidly cooled using induction hardening to vary the depth of the hardened layer. 1. A scroll fluid machine comprising: a hardened surface layer formed by a hardened surface; and a conforming layer formed by a chemical conversion treatment on the hardened surface layer.