JPH0586483A - Plating method and plating device for scroll compressor and scroll member - Google Patents

Abstract

PURPOSE:To execute a surface treatment for reducing friction at a low cost by forming a swiveling scroll and a stationary scroll of an aluminum alloy. CONSTITUTION:An electroless nickel-phosphorus plating layer 5 which is not combined with fine particles is provided on an electroless nickel-phosphorus plating layer 1 on both or one surface of the swiveling scroll and stationary scroll formed of the aluminum material 3. Since the fine particle are embedded into the plating film, the peeling of the fine particles does not arise and the wear resistance of both of the plated sliding surface and the non-plated sliding surface is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and more particularly to a scroll compressor provided with an aluminum orbiting scroll and a fixed scroll, and a surface treatment device for the orbiting scroll and the fixed scroll.

[0002]

2. Description of the Related Art In a scroll compressor, two scroll members 60 each having a spiral wrap 8 on an end plate 7 as shown in FIG.
This is a type in which one is fixed and the other is swirled to compress the gas at the spiral part.

In recent years, in scroll compressors, aluminum materials having a small specific gravity have come to be used in order to reduce the centrifugal force of the orbiting scroll as much as possible as the rotation speed of the orbiting scroll increases. However, aluminum materials have a problem in terms of wear resistance. To solve this, various surface treatment methods have been developed.

In the conventional scroll compressor, there has been considered a method in which one of the orbiting scroll and the fixed scroll is made of aluminum and the other is made of cast iron, and the surface of the aluminum material is subjected to a surface treatment. For example, as described in JP-A No. 62-199982,
A method of electroless nickel-boron plating on the surface of an orbiting scroll, as described in JP-A-64-80785, a surface of an orbiting scroll or a fixed scroll is provided with a plating film containing a predetermined amount of nickel, tungsten or the like. There is a way to do it.

Further, as an example in which both the orbiting scroll and the fixed scroll are made of aluminum material, an actual flat blade 3-998 is used.
As described in Japanese Patent Publication No. 01-001, electroless nickel-phosphorus plating or alumina or silicon carbide (hereinafter referred to as SiC) -based hard material on at least the inner surface of the spiral wrap and the end plate of either the orbiting scroll or the fixed scroll. A scroll-type fluid machine in which fine particles are compound-dispersed and electroless nickel-phosphorus plating is applied, and as described in Japanese Patent Laid-Open No. 125988/1990, a hard anodizing treatment is applied to the surface of either the orbiting scroll or the fixed scroll. There is a method of performing tin plating on the other surface.

[0006]

However, in the above-mentioned prior art, either the orbiting scroll or the fixed scroll used in the scroll compressor is made of an aluminum material and the surface thereof is subjected to a surface treatment, and the other is made of cast iron. In the case of the combination, the sliding surface had good wear resistance, but there was a problem in terms of weight reduction.

Further, when both are made of aluminum, it is necessary to perform a surface treatment on at least one of them, which is a problem in terms of mass production and cost reduction. In particular, when the particle composite surface treatment was applied, there was a problem that the hard particles present on the plating surface were peeled off, the particles acted as an abrasive, and the other side and the surface-treated surface itself were worn. .. An object of the present invention is to reduce the cost of the surface treatment for improving the wear resistance, which is required when reducing the weight of the orbiting scroll and the fixed scroll by using aluminum.

Another object of the present invention is to improve the performance without increasing the machining accuracy by subjecting at least the sliding surface of the orbiting scroll and the fixed scroll using aluminum to a surface treatment having both wear resistance and conformability. It is to make it a scroll compressor.

Another object of the present invention is to provide a plating apparatus suitable for subjecting the surfaces of orbiting scrolls and fixed scrolls to a surface treatment having both wear resistance and familiarity or a surface treatment having wear resistance. Especially.

[0010]

[Means for Solving the Problems]
This is achieved by subjecting either one of the orbiting scroll and the fixed scroll used in the compressor to fine particle composite plating having a structure in which hard fine particles on the surface of plating do not separate from the surface.

As a structure in which fine particles are not separated from the plating surface, an electroless nickel-phosphorus plating layer in which fine particles are not composite is provided on the fine particle composite electroless nickel-phosphorus plating layer.

In the fine particle composite electroless plating having a structure in which fine particles on the surface of the plating are not separated from the surface, in the plating treatment process, the plating treatment is first performed in a plating solution in which the fine particles are mixed, and then the fine particles are mixed. It is obtained by performing the plating treatment in a non-plating solution. This plating treatment may be performed in the same plating solution tank, or may be performed using a plating solution tank containing fine particles and a plating solution tank not containing fine particles.

Further, the above-mentioned problems can be achieved by providing a thick abrasion-resistant fine particle composite plating layer provided on the surface of an aluminum alloy scroll with a plating layer not containing fine particles. When forming a thin plating layer including fine particles, ultrafine particles having a particle diameter of 0.1 μm or less are used as fine particles to be added to the electroless nickel-phosphorus plating solution. Further, the fine particles are preferably hard ones, such as silicon carbide, silicon dioxide, alumina, zirconia dioxide and diamond.

Further, the above object can be achieved by using the fine particle composite plating apparatus having the following constitution.

.. A tank filled with a plating solution containing fine particles, a plating solution stirring means, a means for holding the plating component on a vertical axis, and a first rotating means for rotating the holding means around a horizontal axis passing through the holding means. , A fine particle composite plating apparatus comprising: a second rotating means for rotating a vertical axis.

.. A tank filled with a plating solution containing fine particles, a plating solution stirring means, a means for holding the plating component on a vertical axis, and a first rotating means for rotating the holding means around a horizontal axis passing through the holding means. A fine particle composite plating apparatus provided with a second rotating means for rotating a vertical shaft, a circulation pump for connecting the inlet and outlet of the tank to circulate a plating solution, and a fine particle recovery filter provided on the inlet side of the circulation pump.

.. A tank filled with the plating solution, a partition plate that divides this tank into an area filled with the reference plating solution and an area filled with the plating solution in which the reference plating solution contains fine particles, and the plating solutions in the plurality of areas are stirred. Stirring means, means for holding the plated component on the vertical axis, first rotating means for rotating the holding means around a horizontal axis passing through the holding means, and second rotating means for rotating the vertical axis. A fine particle composite plating apparatus comprising: a moving unit that moves a plurality of regions while the holding unit is immersed in a plating solution.

.. The fine particle composite plating apparatus in which the above tanks are arranged in a hot water tank.

.. A tank having an annular flow path for accommodating the plating solution, a reflux means for circulating the plating solution in the tank along the annular flow path, and at least one location of the annular flow path intersecting the flow path. Openable and closable partition plate, a filter that crosses the flow path on the downstream side of the partition plate and allows only the reference plating solution to pass, a means for holding the plated component, and a holding means for rotating while flowing in the plating solution. A fine particle composite plating apparatus having a moving means for moving along a path.

[0020]

When the electroless nickel-phosphorus plating is coated on the surface of either the orbiting scroll or the fixed scroll, even if both scrolls are made of aluminum, there is a plating film, and therefore aluminum does not adhere to each other. It is possible to provide a scroll compressor in which there is no sliding and there is no risk of seizure or the like on the sliding surface.

In addition, fine particles such as SiC are contained in the plating film.
Fine particles of a substance with high hardness such as are dispersed, and these fine particles exposed on the surface of the plating film are embedded and locked in the plating film, so these particles separate from the surface of the plating film and act as an abrasive. Wear resistance of both the plated sliding surface and the non-plated sliding surface is improved.

Fine particle composite electroless nickel according to the present invention
When forming a phosphorous plating film, first, electroless plating is performed in a plating solution in which fine particles are mixed. The plating film formed in this first step has a form in which fine particles mixed in the plating solution are embedded, but only a part of the surface of the fine particles exposed from the surface of the plating film is formed. Fine particles in various states are mixed up to fine particles in a state of adhering to the surface of the plating film. Next, the electroless plating process is performed on the plating film in this state in a plating solution in which no fine particles are mixed. In this second step, new fine particles do not adhere to the plating film but only the metal of the plating adheres. Therefore, the fine particles exposed on the surface of the plating film formed in the first step are Embedded. If the plating time in the second step is lengthened, the fine particles will be embedded in the plating film. If the plating time in the second stage is lengthened, the fine particles will be completely embedded in the plating film, and if the plating time is shortened, the fine particles will be in a state of being embedded, for example, about half.

The fine particles on the surface of the plating film obtained after finishing the plating treatment in the second stage are locked in the plating layer and are not easily peeled off. As a result, the amount of fine particles that peel from the surface of the plating film and act as an abrasive on the sliding surface is reduced, and the abrasion of the scroll surface is reduced.

If the layer containing fine particles having wear resistance is thinned and the layer not containing fine particles is thicker thereon, the layer not containing fine particles during familiar running after the orbiting scroll and the fixed scroll are assembled. Even if the parts that slide with each other wear, the aluminum does not wear, and a proper sealing effect can be obtained.

At this time, even if either one wears and reaches the fine particle composite layer, the other part wears thereafter and the aluminum surface is protected. The layer for obtaining the sealing effect of such sliding portions is a so-called "familiar layer".

Since the layer that is released by abrasion is a layer that does not combine fine particles, the fine particles do not separate and do not act as an abrasive. By thickening the familiar layer,
An appropriate shape having a sealing effect is formed by the layer coated on the surface of the scroll without processing the shape of the scroll with high accuracy.

The plating apparatus of the present invention is optimal for forming the above-mentioned plating layer.

By rotating the holding means for holding the scroll member about its own axis and rotating it about the vertical axis,
The plating solution is supplied to the entire area of the scroll member having a deep structure to form a uniform plating layer.

Further, since a fine particle composite plating solution and a plating solution which does not combine fine particles can be formed by providing a filter and a partition plate for removing fine particles of the plating solution containing fine particles, it is possible to easily form a plating layer having a two-layer structure. Can be formed.

[0030]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 10 and 12.

First, the pretreatment process for plating is shown in FIG.
The plating treatments described below were all performed after this pretreatment.
In addition, AD-68F, AD-101, AD-30 in the figure
1-3X are all reagents manufactured by Uemura Industry Co., Ltd.

Example 1 of the present invention is shown in FIG. The figure shows S coated on the surface of aluminum 3 forming a scroll.
The cross section of the iC composite electroless nickel-phosphorus plating film 1 is shown, and this plating film 1 is formed including the SiC fine particles 2, and the SiC fine particles 2 are uniformly dispersed in the plating film 1.

Further, the nickel-phosphorus plating layer 5 containing no SiC fine particles 2 is coated on the plating film 1. Such a plating layer 5 has an effect of compensating for errors in processing accuracy and assembling accuracy of the scroll member. That is, the performance of a scroll compressor generally depends on the size of the gap between the orbiting scroll and the fixed scroll. Higher performance requires precision machining and assembly to reduce the gap, which is extremely difficult. Therefore, an electroless nickel-phosphorus plating having a predetermined thickness, which lacks wear resistance, is now applied onto the SiC composite electroless nickel-phosphorus plating (hereinafter, all plating is electroless plating). The phosphorus-plated layer is worn and its thickness is reduced, and the clearance is kept constant. In other words, this plating layer is a so-called familiar layer, and serves as a sealing material. This makes it possible to absorb an error in processing accuracy or assembly accuracy.

Although FIG. 1 shows a state in which the SiC fine particles are completely covered with the nickel-phosphorus plating layer 5,
When the nickel-phosphorus plating layer that does not combine fine particles is thinned, the SiC fine particles 2 are partially exposed on the surface and are in a state of being locked by the plating layers 1 and 5.

FIG. 2 is a sectional view of an orbiting scroll provided with a plating layer in which SiC fine particles are compounded in this embodiment. The scroll member comprises an end plate 7 and a wrap 8 formed substantially perpendicular to the end plate 7 as shown in the figure. When viewed from above in FIG. 2, the wrap 8 has a spiral shape as shown in FIG. .. In the present embodiment, plating is applied to almost the entire area except a part below the end plate 7, but plating may be applied only to the sliding portion with the mating member.

The SiC composite nickel-phosphorus plating as described above can be treated by the method described below.

FIG. 3 shows a mechanism for rotating the object to be plated 14 in a solution. This mechanism includes a linear drive shaft 11 which is a moving means arranged above the bath 12 filled with the plating solution, a movable base 27 which is driven by the linear drive shaft 11 and moves in the horizontal direction, and a movable base 27. A hollow vertical rotary drive shaft 28 rotatably mounted, a rotary drive means 10 mounted on a moving table for rotating the vertical rotary drive shaft 28 around the shaft, and a vertical rotary drive shaft 28 inside the rotary rotary drive shaft 28. ,
A horizontal rotary drive shaft 29 inserted substantially parallel to the axis of the rotary drive shaft 28 and an opening 30 provided on the side surface of the vertical rotary drive shaft 28 connected to the horizontal rotary drive shaft 29 via a bevel gear. The horizontal rotary shaft 26 that projects substantially horizontally outside the drive shaft 28, the holding means 25 attached to the tip of the horizontal rotary shaft 26, and the horizontal rotary drive shaft 29 attached to the upper end of the vertical rotary drive shaft 28. Is connected to the rotation driving means 9 for rotating the upper end of the shaft around its axis. The vertical rotation drive shaft 28 is arranged such that its axial center is substantially vertical and the opening 30 on the lower side surface thereof is below the liquid level of the plating solution.

The above mechanism operates as follows. First, the holding means 25 holds the object to be plated 14 in the plating solution. When the rotary drive means 9 rotates the horizontal rotary drive shaft 29, the horizontal rotary shaft 26 is rotated via the bevel gear, and the plated object 14 held by the holding means 25 is rotated around the horizontal axis. The holding means 25 holds the object to be plated 14 such that the central axis of the object to be plated 14 substantially coincides with the axis of the horizontal rotary shaft 26, and the object to be plated 14 rotates around its own central axis. To do. When the rotary drive means 10 rotates the vertical rotary drive shaft 28, the horizontal rotary shaft 26 is rotated.
While rotating about its own axis, it rotates about the vertical axis as the opening 30 of the vertical rotation drive shaft 28 rotates.

By the above-described two-direction rotation in the plating solution, the relative relationship between the direction of movement of the plating solution and the fine particles floating in the plating solution and the surface of the object to be plated 14 does not remain constant. There is no difference between the upper and lower sides of the amount of plating adhered on the object to be plated 14 and the difference between the front and back sides, and the plating and fine particles are uniformly adhered to the entire surface. In addition, the linear drive shaft 11
Thus, the object to be plated 14 can be moved to the left and right, and the difference due to the location of the tank can be eliminated. Next, by moving to a plating solution in which SiC fine particles are not mixed and performing plating, Si in various states mixed on the surface of the plating film is mixed.
C fine particles are embedded in the nickel-phosphorus plating film.

With the mechanism as described above, it is possible to obtain a composite plating in which SiC particles are uniformly dispersed even in a complicated shape such as a scroll.

The second embodiment will be described with reference to FIG. Figure 4
FIG. 3 is a partial cross-sectional view including an electroless nickel-phosphorus plating layer 1 in which SiC fine particles are compounded on the surface of aluminum 3 forming a scroll, and a surface layer of the scroll on which an electroless nickel-phosphorus plating layer 5 is applied. The part excluding the surface layer is the same as that of the first embodiment. In this embodiment, S
The electroless nickel-phosphorus plating layer 1 including the iC fine particles 2 was formed with a thickness of 2 μm and the electroless nickel-phosphorus plating layer 5 was formed with a thickness of 15 μm.

The SiC fine particles 2 used in this embodiment are
Since the plating layer 1 including the SiC fine particles 2 is thin, the particle size is 0.1 μm so as to be uniformly dispersed in the plating layer 1.
The following ultrafine particles were used. In this embodiment, since the electroless nickel-phosphorus plating layer 5 serving as the familiar layer is thickened, the effect of absorbing the error in the working accuracy and assembling accuracy of the scroll is greater than that in the first embodiment.

Example 3 is shown in FIG. The plating apparatus shown in the figure includes a bath 17 and a bath 12 arranged in the bath 17.
A movable partition plate 20 for partitioning the tank 12 into two regions, a first and a second region, and a plated object moving / rotating mechanism mounted above the tank 12 (a mechanism similar to that described in FIG. 18), a stirrer 19 and a hot magnetic stirrer 13 respectively arranged in the two regions.
It is configured to include and. In the first region, the nickel-phosphorus plating solution 15 in which SiC particles are not mixed,
The second region is filled with the nickel-phosphorus plating solution 16 in which the SiC fine particles are not mixed. The particle size of the SiC particles mixed in this example is 0.1.
Although it is about μm, it is desirable that the maximum is about 1 μm.

First, the object to be plated 14 is placed in the first region on the right side containing the plating solution 15 in which SiC particles are mixed, and the composite plating of SiC is performed. At this time, the object to be plated 14 is rotated in the liquid by the object to be plated rotation moving mechanism 18. On the other hand, the plating solution is stirred by the hot magnetic stirrer 13 and the stirring bar 19. At this stage, a plating film in which the SiC fine particles are uniformly dispersed and embedded in the nickel-phosphorus plating film is formed. After a predetermined time, the movable partition plate 20 is opened, and the object to be plated 14 is quickly moved to the second area on the left side, which is filled with the plating solution 16 in which the SiC fine particles are not mixed, and the plating process is performed again. Done. At the stage of moving from the first region to the second region, the entire surface of the formed plating film is exposed by only adhering to the plating film surface from the fine particles partially exposed from the plating film surface. The fine SiC particles of various exposed states are mixed. In the second region, since the SiC fine particles are not mixed in the plating solution, a nickel-phosphorus plating film containing no SiC fine particles is formed.
The SiC fine particles in various states, which were mixed on the surface of the plating film when moved to the region, are gradually embedded in the nickel-phosphorus plating film. The plating is electroless plating in both the first and second regions.

Next, a fourth embodiment is shown in FIG. The plating apparatus shown in the figure includes a hot water tank 17 and a hot water tank 12 arranged in the hot water tank 17.
An object moving and rotating mechanism (a mechanism similar to that described in FIG. 3 and description thereof is omitted) 18 mounted above the tank 12, and an agitator 19 arranged at the bottom of the tank 12.
And a hot magnetic stirrer 13 arranged outside the bottom of the tank 12. In the plating solution 15 in which SiC particles are mixed, the object 14 to be plated contains Si.
C composite plating is performed. During plating, the object to be plated 14 is rotated by the object moving and rotating mechanism (a mechanism similar to that described in FIG. 3, description is omitted) 18, and the plating solution is also stirred. After a predetermined time, the rotation of the object to be plated 14 and the stirring of the plating solution 15 are stopped.
When the stirring of the plating solution 15 is stopped, Si in the plating solution 15
Since the C particles are heavy, they settle. Utilizing this, the second-stage plating (plating for embedding SiC particles) is performed where there is no upper SiC particle in the plating solution.

According to this method, the plating process can be performed in the same plating solution, and the operation is easy with a very simple device.

Example 5 is shown in FIG. The plating apparatus shown in the figure includes a hot water tank 17, a tank 12 arranged in the hot water tank 17 and filled with a SiC composite nickel-phosphorus plating solution 15, a stirrer 19 as a stirring means for stirring the plating solution, and a hot magnetic stirrer. 13, a plated object moving / rotating mechanism (a mechanism similar to that described in FIG. 3, description thereof is omitted) 18 for storing and rotating the plated object 14 in a plating solution, and a tank 12 It includes a circulation pump 22 connected to the inlet / outlet to circulate the plating solution, and a filter 21 mounted on the inlet side of the circulation pump to collect the SiC fine particles contained in the SiC composite nickel-phosphorus plating solution 15. It is configured.

According to the present embodiment, the object to be plated 14 is first subjected to the first stage plating (plating containing SiC particles) in the liquid 15 in which SiC fine particles are mixed. When the treatment of the first stage plating is completed, the liquid 15 mixed with SiC particles is pumped out from the bottom of the tank by the pump 22, the SiC particles are removed through the filter 21, and only the plating solution is returned to the tank. Be done. After the SiC particles are removed from the plating solution, the second stage plating (plating not containing SiC particles) is performed. This method is an improved version of Example 4. Although the plating treatment is performed in the same solution as in Example 4, as described above, since the SiC particles are completely removed from the solution, the SiC particles should be more reliably embedded in the plating layer. You can

As another example, Embodiment 6 is shown in FIG.
The plating apparatus shown in the drawing is a running water pool type tank 12 that forms a ring-shaped flow path and stores a plating solution, and a circulation means (not shown) that circulates the plating solution in the tank along the ring-shaped flow path. An openable and closable partition plate 20 is installed in three places in the annular flow path at predetermined intervals, and a partition plate 20 is arranged at a predetermined interval with the partition plate 20 on the downstream side of one of the partition plates 20. A filter 21 that forms an SiC composite nickel-phosphorus plating solution region between the plate 20 and the plate 20, and the object to be plated 14 is rotated while being immersed in the plating solution, and is moved along the flow path in the direction opposite to the flow of the plating solution. Plated object moving and rotating mechanism 2
4 is included. The plated object moving / rotating mechanism 24 is provided with the same holding means and rotating means as the plated object moving / rotating mechanism 18, and is configured to move the plated object along the annular flow path.

In this embodiment, the plating tank is shaped like a running water pool, and the object to be plated 14 is rotated while rotating in the direction opposite to the flow of the solution. Further, the plating tank is provided with a movable partition plate 20, and the object to be plated 14 is subjected to the first stage plating treatment while passing through a tank containing a nickel-phosphorus plating solution 15 in which SiC particles are mixed. , And then moved to the tank containing the solution 16 in which the SiC particles were not mixed,
Perform the plating treatment at the stage. By adjusting the moving speed of the object to be plated 14, the film thickness of the plating to be processed can be set to a desired film thickness. This is a plating processing device that can be mass-produced.

Using the method as described above, the SiC composite plating is plated with no SiC particles to embed the SiC particles on the plating surface in the plating layer.

Further, FIG. 9 shows a SiC particle composite electroless nickel-phosphorus plating formed by a conventional method (plating in which fine particles are present on the surface of the plated film by the conventional method).
And the result of the sliding test of the SiC composite electroless nickel-phosphorus plating (having the shape shown in FIG. 1) formed by the apparatus shown in Example 3. The fixed test pieces were plated.

Test conditions (a) Shape of test piece (1) Fixed test piece (disk shape) Diameter 37 mm Thickness 12
mm (2) Rotating test piece (ring shape) Outer diameter 26 mm Inner diameter 1
6mm Thickness 12mm (b) Sliding condition (1) Speed 3.14m / s (2) Load 12.2kgf / cm ² (3) Lubricating oil Flare F56 (c) Specimen (1) Fixed test piece AHS ( 11% Si content A
1) (2) Rotation test piece AHS (A containing 11% Si
1) As is apparent from FIG. 9, in the case of the conventional method, the plated surface itself is hardly worn, but the other side is worn. However, in the case of the method of the present invention this time, only slight wear is observed in both cases.

In each of the above-mentioned embodiments, SiC fine particles are used as fine particles dispersed in the plating film. However, in addition to SiC, oxides such as SiO ₂ , Al ₂ O ₃ and ZiO ₂ , diamond, and high hardness are used. Fine particles that are easily dispersed in the plating solution, such as metal, may be used. Further, as the plating film for embedding these fine particles, in addition to the nickel-phosphorus plating film used in the embodiment, a plating film of copper, chromium, tin or the like may be used.

FIG. 12 is a view for explaining the seventh embodiment and is a sectional view showing the entire structure of the scroll compressor 70. The compression section includes a fixed scroll 40 having a spiral wrap on the end plate, a swivel scroll 8 also having a spiral wrap on the end plate, and an Oldham for preventing rotation of the swirl scroll 8. It is composed of a ring 42, and has a configuration in which the wraps of the fixed scroll 40 and the turning scroll 8 are meshed with each other. In this compression unit, the swirl scroll 8 swivels through the shaft 45, so that the suction port 50
The volume of the gas sucked from is reduced and compressed as the space (compression chamber) formed by the swirl scroll 6 and the fixed scroll 40 moves toward the center of the scroll. The compressed gas is discharged from the discharge port 52 provided at the center of the fixed scroll.

In this example, the aluminum alloy scroll member whose surface was coated according to Example 2 was used as both the swivel scroll member and the fixed scroll member. After operating under normal operating conditions (4 hours), the familiar layers of both scroll members were worn at several places, and some of them became Si.
The layer in which the C fine particles 2 were compounded was exposed, but the aluminum portion was not exposed, and the performance was also good.

On the surface of the aluminum alloy swirl scroll member, Si was applied by the method described in the first embodiment.
C fine particle composite nickel-phosphorus plating film (average thickness 7μ
m) and a film of nickel-phosphorus plating only (average thickness 3
The coating was applied to a scroll compressor and operated under normal operating conditions. Cast iron (FC25) was used for the fixed scroll member.

On the surface of the sliding portion of the orbiting scroll after the operation, the nickel-phosphorus plating layer was slightly worn, and a film composed of SiC was partially exposed. On the other hand, the sliding portion of the fixed scroll member was hardly worn and exhibited a good sliding surface.

In this embodiment, the surface film of the scroll member is applied to almost the entire surface of the scroll member. However, the wrap portion of the fixed scroll, the lap side of the end plate, and the wrap portion of the orbiting scroll are used. The same effect was obtained even when the plating was applied only to the lap side of the end plate and the sliding part such as the Oldham ring built-in part.

[0060]

According to the present invention, at least one of an orbiting scroll and a fixed scroll formed of an aluminum alloy, an electroless nickel-phosphorus plated layer having fine particles on the surface thereof and an electroless nickel-plated layer thereon. Fine particles of the plating layer do not fall off by forming with a phosphorus plating layer or by forming the surface of the electroless nickel-phosphorus plating layer that is a composite of fine particles with a layer containing only electroless nickel-phosphorus Therefore, the wear resistance of the scroll compressor is improved. Also, by increasing the thickness of the electroless nickel-phosphorus plating layer provided on the electroless nickel-phosphorus plating layer in which fine particles are combined, the electroless nickel-phosphorus plating layer becomes a familiar layer and has sealing property and wear resistance. Can be a scroll compressor. Further, by using the plating apparatus of the present invention, a surface coating consisting of two layers, a fine particle composite layer and a layer not containing fine particles, can be easily formed on the surface of the scroll member.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a plating situation of Example 1.

FIG. 2 is a cross-sectional view of a scroll member that has been plated according to the present invention.

FIG. 3 is a perspective view of a plating apparatus used in Example 1.

FIG. 4 is a cross-sectional view showing a plating situation of Example 2.

FIG. 5 is a sectional view of a plating apparatus showing an embodiment of the present invention.

FIG. 6 is a sectional view of a plating apparatus showing an embodiment of the present invention.

FIG. 7 is a sectional view of a plating apparatus showing an embodiment of the present invention.

FIG. 8 is an explanatory diagram of a plating apparatus of the present invention.

FIG. 9 is a graph showing a sliding test result.

FIG. 10 is a procedure diagram showing a pretreatment for plating.

FIG. 11 is a perspective view of a scroll member.

FIG. 12 is a cross-sectional view of a scroll compressor.

[Explanation of symbols]

1 ... SiC composite nickel-phosphorus plating film, 2 ... SiC
Particles, 3 ... Aluminum material, 5 ... Nickel-phosphorus plating layer, 6 ... Orbiting scroll, 7 ... End plate, 8 ... Wrap, 9 ... Rotation drive means, 10 ... Rotation drive means, 11
... moving means (linear drive shaft), 12 ... tank, 13 ... hot magnetic stirrer, 14 ... object to be plated, 15 ...
SiC mixed nickel-phosphorus plating solution, 16 ... Nickel-phosphorus plating solution, 17 ... Hot water tank, 18 ... Plating object moving / rotating mechanism, 19 ... Stirrer, 20 ... Movable partition plate,
21 ... Filter, 22 ... Circulation pump, 23 ... Liquid flow direction, 24 ... Plated object moving and rotating mechanism, 25 ... Holding means, 26 ... Horizontal rotating shaft, 27 ... Moving base, 28 ... Vertical rotating drive shaft, 29 ... horizontal rotation drive shaft, 30 ...
Opening, 40 ... Fixed scroll, 42 ... Oldham ring, 45 ... Shaft, 50 ... Suction port, 52 ... Discharge port, 60 ... Scroll member, 70 ... Scroll compressor.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toru Iizuka 800 Tomita, Ohira-cho, Shimotsuga-gun, Tochigi Prefecture Tochigi Plant, Hitachi, Ltd. (72) Nobuo Abe Oita-cho, Shimotsuga-gun, Tochigi 800 Address Tomita 800 Hitachi Co., Ltd.Tochigi Plant (72) Inventor Kazuo Ikeda 800 Tomita, Ohira-cho, Shimotsuga-gun, Tochigi Prefecture Hitachi Co., Ltd.Tochigi Plant (72) Inventor, Joji Okamoto 390 Muramatsu, Shimizu City, Hitachi Co., Ltd.Shimizu Plant, Hitachi Ltd.

Claims (15)

[Claims] 1. An orbiting scroll having a spiral wrap formed on an end plate and a fixed scroll having a spiral wrap formed on the end plate are meshed with each other, and the orbiting scroll is prevented from rotating by a rotation preventing mechanism. The orbiting scroll and the fixed scroll are made to orbit, and the orbiting scroll and the fixed scroll are made of an aluminum alloy, and a scroll compressor formed by forming an electroless nickel-phosphorus plating layer on the surface of both or one of them, A scroll compressor characterized in that a composite electroless nickel-phosphorus plating layer encloses fine particles inside thereof and its surface is composed of a layer of nickel-phosphorus only. 2. An orbiting scroll having a spiral wrap formed on the end plate and a fixed scroll having a spiral wrap formed on the end plate are meshed with each other, and the orbiting scroll is prevented from rotating by a rotation preventing mechanism. The orbiting scroll and the fixed scroll are made to orbit, and the orbiting scroll and the fixed scroll are made of an aluminum alloy, and a scroll compressor formed by forming an electroless nickel-phosphorus plating layer on the surface of both or one of them, A scroll compressor having an electroless nickel-phosphorus plating layer formed on a composite electroless nickel-phosphorus plating layer. 3. An orbiting scroll in which a spiral wrap is formed on an end plate is meshed with a fixed scroll in which an end wrap is similarly formed in an end plate, and the orbiting scroll is prevented from rotating by a rotation preventing mechanism. In a scroll compressor for orbiting, the orbiting scroll and the fixed scroll are made of an aluminum alloy and are formed with an electroless nickel-phosphorus plated layer in which fine particles are compounded on both or one sliding surface of the aluminum alloy. A scroll compressor characterized in that the fine particle composite electroless nickel-phosphorus plating layer encloses fine particles inside thereof, and the surface thereof is composed of a layer of only nickel-phosphorus. 4. An orbiting scroll having a spiral wrap formed on an end plate and a fixed scroll having a spiral wrap similarly formed on the end plate are meshed with each other, and the orbiting scroll is prevented from rotating by a rotation preventing mechanism. In a scroll compressor for orbiting, the orbiting scroll and the fixed scroll are made of an aluminum alloy and are formed with an electroless nickel-phosphorus plated layer in which fine particles are compounded on both or one sliding surface of the aluminum alloy. The fine particle composite electroless nickel-electroless nickel-on the phosphorus plating layer
A scroll compressor in which a phosphorous plating layer is formed. 5. The scroll compressor according to claim 2, wherein the thickness of the electroless nickel-phosphorus plating layer is thicker than the thickness of the fine particle composite electroless nickel-phosphorus plating layer. 6. The scroll compressor according to claim 1, wherein the fine particles are made of any one of silicon carbide, silicon dioxide, alumina, zirconia dioxide and diamond. 7. A method of plating a scroll member, wherein a plating layer is formed on the surface of the scroll member, after plating in a bath filled with an electroless nickel-phosphorus plating solution containing fine particles, and then an electroless nickel-phosphorus plating solution. A method for plating a scroll member, characterized in that plating is performed again in a bath filled with water. 8. A method for plating a scroll member in which a plating layer is formed on the surface of the scroll member, wherein the fine particles are suspended in a plating solution in a bath filled with an electroless nickel-phosphorus plating solution containing fine particles. After the plating, the fine particles are settled in the lower part of the bath, and the plating solution is re-plated with a plating solution in the upper part of the bath. 9. A method of plating a scroll member, wherein a plating layer is formed on the surface of the scroll member, wherein the particles are suspended in a plating solution in a bath filled with an electroless nickel-phosphorus plating solution containing particles and plated. After that, the plating solution is circulated through a filter to remove the fine particles, and plating is performed again. 10. The scroll member is attached to and rotated by a rotary shaft passing through the scroll member and / or a rotary shaft deviating from the scroll member during a fixed period or the whole period during plating. Through 9
The method for plating a scroll member according to any one of 1. 11. A bath filled with a plating solution containing fine particles, stirring means for stirring the plating solution, holding means for holding a component to be plated in the plating solution and attached to a vertical shaft, and the holding means. A fine particle composite plating apparatus comprising: a first rotating means for rotating the holding means around a horizontal axis passing through and a second rotating means for rotating the vertical axis. 12. A tank filled with a plating solution containing fine particles, stirring means for stirring the plating solution, holding means for holding a member to be plated in the plating solution and attached to a vertical shaft, and the holding means. A first rotating means for rotating the holding means around a horizontal axis passing through, a second rotating means for rotating the vertical axis, and a circulation pump for circulating a plating solution with its inlet and outlet connected to the bath. A fine particle composite plating apparatus, comprising: a filter mounted on the inlet side of the circulation pump to collect the fine particles. 13. A tank filled with a plating solution, a partition plate partitioning the tank into at least a region filled with a reference plating solution and a region filled with a plating solution containing fine particles in the reference plating solution, and the partition plate. A stirring means disposed in the region for stirring the plating solution; a holding means for holding the component to be plated in the plating solution and attached to a vertical shaft; and a rotating means for rotating the holding means around a horizontal axis passing through the holding means. Fine particles comprising: a first rotating means, a second rotating means for rotating the vertical shaft, and a moving means for moving the plurality of regions while being immersed in the plating solution of the holding means. Complex plating equipment. 14. The fine particle composite plating apparatus according to claim 11, wherein the bath is arranged in a hot water bath. 15. A tank for forming a ring-shaped flow path for accommodating a plating solution, a reflux means for circulating the plating solution in the tank along the ring-shaped flow path, and at least one of the ring-shaped flow paths. A partition plate that can be opened and closed and that is disposed so as to intersect with the flow path at a location, and a partition plate that is disposed so as to intersect with the flow path at the downstream side of the partition plate and that is composed of fine particles in a standard plating solution A filter that passes only the reference plating solution in the plating solution that forms the fine particle composite plating solution region, a holding means that holds the plating component in the plating solution, and a flow path while rotating the holding means in the plating solution. A fine particle composite plating apparatus comprising: a moving unit that moves along the same.