KR20000058367A - Method for coating of pistion for compressor and apparatus the same - Google Patents

Abstract

PURPOSE: A coating film formation of a compressor piston is provided, which reduces the number of the people required on work according to the formation of coating films; forms coating films evenly; reduces a great loss of paint to form coating films; prevents the pollution by paint. CONSTITUTION: A coating film formation of a compressor piston comprises the steps of; supporting a pivot of both ends of a piston (100) for a compressor by a support element (31)(32); rotating a piston (100) and injecting paint around a coating part (110) of a piston (100) using a nozzle (42); distributing the injected paint to be extended approaching a blade to a coating part (110) of a piston (100), thereby forming a coating film.

Description

Method for forming coating film of piston for compressor and apparatus therefor {Method for coating of pistion for compressor and apparatus the same}

The present invention relates to a compressor, and more particularly to a method and apparatus for forming a coating film on the outer peripheral surface of the piston in contact with the cylinder.

BACKGROUND ART A compressor used in an automobile air conditioner is continuously provided by a suction action of sucking vaporized heat exchange medium in an evaporator, a compression action of compressing the sucked heat exchange medium, and a pumping action of pumping the compressed heat exchange medium. Allow the refrigerant to circulate. Such compressors may be of various types, such as swash plate type, scroll type, rotary type, wobble plate type, etc., depending on the driving method.

1 shows an example of a swash plate type compressor among these compressors.

It is divided into two main bodies 11 and 11 ', and cylinders 12 and 12' are fixedly installed inside the main bodies 11 and 11 '. The swash plate 14 supported by the rotating shaft 13 is provided in between. In addition, a piston 21 is formed in each of the cylinders 12 and 12 'so that a piston 20 having an insertion portion 22 into which an edge of the swash plate 14 is inserted is slidably installed. do. In addition, a shoe (shoe) 16 is installed at the contact portion between the swash plate 14 and the piston 20 installed in the insertion portion 15b to reduce frictional force due to contact. And valve units 17 and 17 'are provided between the both sides of the cylinders 12 and 12' and the inner circumferential surfaces of the main bodies 11 and 11 '.

In the conventional compressor 10 configured as described above, as the rotating shaft 13 rotates, the swash plate 14 fixed to the rotating shaft 13 rotates, and thus, a plurality of pistons supported by the swash plate 14 ( 20 compresses the heat exchange medium while being reciprocated with respect to the cylinders 12 and 12 '.

In such a compressor, the outer peripheral surfaces of both ends of the piston 20 slide while being in contact with the inner surfaces of the cylinders 12 and 12 ', thereby requiring wear resistance and airtightness with the inner peripheral surfaces of the cylinders 12 and 12'.

A piston for improving such wear resistance and airtightness is disclosed in Japanese Patent Laid-Open No. 55-84880.

The disclosed configuration is made of a cylinder block and a piston made of an aluminum alloy material of the same metal material having the same thermal expansion coefficient, and the outer peripheral surface of the piston is made of ethylene fluoride such as 4-fluoroethylene or a copolymer of ethylene fluoride and a vinyl compound. A coating layer composed of a fluororesin is formed.

The formation of such a coating layer is obtained by shot blasting the outer circumferential surface of the piston and then covering the coating material by powder spraying or dipping and heating in a furnace at 250 to 350 for about 30 minutes.

Japanese Laid-Open Patent Publication No. 57-86580 discloses a swash plate compressor in which a ethylene fluoride or a copolymer of ethylene fluoride and a vinyl compound having a lower thermal conductivity than the base material is used on the surface of the piston to improve the airtightness and wear resistance of the piston and the cylinder. The structure which formed the coated coating film is disclosed.

In order to improve adhesion, the coating film removes the oxide film of the piston, and the coating film is applied to both ends of the piston. Coating of the coating film is made of spray coating or electrostatic coating. When the spray coating is made, it is baked for 30 minutes at 250 to 350 degrees.

In the above-described inventions, the coating film is formed on the outer circumferential surface of the piston because the powder is sprayed, sprayed, or electrostatic coated, so that the coating film thickness is severely distributed when the coating film is formed. In particular, the formation of the coating film using the spray preheats the piston at 75 to 80 degrees, and forms the primary spray coating at 22 ± 5 degrees as shown in FIG. Then, it is rapidly dried at 77 to 87 degrees, and after the second spray coating, low temperature drying (drying at 80 to 90 degrees) and high temperature drying (drying at 135 to 145 degrees). When the drying is completed as described above it is repeatedly fired.

As described above, spray coating is difficult in the coating process, and there is a problem in that the sprayed paint is scattered and coated to the area not to be coated. Accordingly, the consumption of the paint for forming the film is excessive. In addition, there is a problem that the surrounding is severely polluted by the paint splashing during spray coating.

The present invention is to solve the above problems, it is possible to reduce the work maneuver according to the formation of the coating film of the piston, it is an object of the present invention to provide a coating film forming method and apparatus of the piston for the compressor to form a uniform coating film. .

Another object of the present invention to reduce the excessive loss of the paint for the formation of the coating film, to provide a coating film forming method and apparatus for forming a piston for the compressor that can prevent the contamination of the surroundings by the paint.

1 is a cross-sectional view of a typical compressor,

2 is a block diagram showing a conventional coating method;

Figure 3 is a block diagram showing a coating film forming method of a piston for a compressor according to the present invention,

4 is a perspective view showing a coating film forming apparatus of a piston for a compressor according to the present invention;

FIG. 5 is a side view of the coating film forming apparatus shown in FIG. 4, illustrating a state in which paint is applied to a coating part of a piston.

<Explanation of symbols for main parts of drawing>

31, 32; Support member

40; Nozzle unit 41; Discharge

42; Nozzle 50; Paint spreading means

100; piston 110; Coating part

Method for forming a coating film of the piston for a compressor of the present invention to achieve the above object,

A support step for rotatably supporting the compressor piston;

Injecting paint into the coating of the piston while rotating the piston;

It characterized in that it comprises the step of forming a coating film on the coating by expanding the paint introduced into the coating of the piston in the fixed paint is injected.

In the present invention, the spacing between the braid and the outer peripheral surface of the piston coating is substantially the same of the coating film. And a drying step of drying the coating film of the piston after forming the coating film of the piston, and a firing step of baking the dried coating film.

In order to achieve the above object, the present invention provides a coating film forming apparatus for a piston for a compressor, including: a support member for supporting the center of rotation of both end sides of the piston; a drive unit for rotating the piston supported by the support; and the coating of the piston. And a braid unit installed in close proximity to the unit and lifting up and down by a predetermined lifting means, and installed to correspond to the coating part of the piston and forward and backward to the coating part of the piston by a predetermined forward and backward means. do.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram of a method for coating a Teflon heat-resistant synthetic resin of Teflon fluorine resin system on the outer circumferential surface of both ends of the piston of the swash plate compressor according to the present invention, ie, a coating portion that is in close contact with the cylinder of the compressor. Showed.

As shown in the drawing, in order to form a coating film using the material on the coating part of the piston, the center of rotation of both ends of the piston is supported to rotate the piston at a predetermined rotational speed, and the paint is applied from the row of the upper part of the rotating piston. Discharging to attach to the outer circumferential surface of the coating part. Here, the paint contains 35 to 37% solids, and the viscosity is relatively high.

As described above, before the paint is applied to the coating part of the piston, a blade is brought close to the coating part of the piston to expand the paint applied to the coating part to form a coating film on the coating part. Here, the distance between the end of the braid and the end of the coating portion is substantially the same as the thickness of the coating film to be formed in consideration of the baking process described later. The spreading of the paint may be spread by using a plurality of nozzles, or by spreading the paint by applying a coating to the coating portion by rotating the nozzle at a high speed. Spray coating of the paint on a bridge connecting both ends of the compressor piston. It further comprises a coating step.

When the formation of the coating film is completed by the forming step of the coating film, the coating film is dried at 80 to 140 degrees for 40 to 50 minutes. And the piston of the drying of the coating film is first baked for 30 minutes to 60 minutes at 160 to 180 degrees, the second firing for 30 minutes at 230 degrees or more to complete the formation of the coating film in the piston coating.

As described above, the thickness of the coating part may be changed when the piston is separated from the coating part of the piston in the process of forming a coating film on the coating part of the piston, so that no trace occurs when the blade is separated from the adjacent part of the coating part. It is desirable to retract while raising the braid upwards. On the other hand, it is preferable to rotate the rotation speed at a low speed when spraying the coating on the coating part and to rotate at a high speed in order to reduce the overlapped portion during leveling of the paint and detachment of the braid after one revolution. In the case of overlapping traces during coating, the polishing step may further include a polishing step of polishing the same.

4 shows a coating film forming apparatus of a piston for a compressor for forming the coating film.

As shown, the coating film forming apparatus rotates the support members 31 and 32 supporting the center of rotation of both end sides of the piston 100 and the piston 100 supported by the support members 31 and 32. It includes a drive unit (not shown). The support member 31 is supported by the frame 34 and is sharply formed to support the piston 100 by being coupled to the center groove 101 formed at the center of both end sides of the piston 100. In addition, the driving unit rotates the piston 100, and a motor for driving rotation of at least one of the supporting members 31 and 32 of the supporting members 31 and 32 supported by the frame 34. Not included).

And the nozzle unit 40 for discharging the paint on the outer circumferential surface of the coating portion 110 is installed on the vertical upper portion corresponding to the coating portion 110 of the piston 100 supported by the support members 31, 32 do. The nozzle unit 40 includes a nozzle 42 having a plurality of discharge parts 41 for discharging the paint to the coating part 100 and connected to the paint supply means (for example, a pump for pumping the stirred paint). The declining discharge portion may be provided with a solenoid valve to individually control the discharged paint.

And the nozzle 42 is supported by the lifting means 43 of the piston 100 is elevated relative to the coating portion. The lifting means 43 is composed of an actuator such as a cylinder, a linear motor, a cylinder, or the like.

In addition, a paint spreading means 50 is provided on the front surface of the piston 100 to spread the paint discharged by the nozzle 42 and applied to the coating part. The paint spreading means 50 includes a cylinder, a ball screw, and the like. It includes a braid 52 that is advanced back and forth by the forward and backward means 51 such as. Here, the braid 52 may be formed to protrude only in a region corresponding to the coating portion of the piston, the end of the braid 52 in contact with the coating portion 110 of the piston 100 is formed to be curved desirable. And although it is shown in the drawing, the braid 52 may be further provided with a braid lifting means made of an actuator so as to move up and down as well as forward and backward.

Referring to the operation of the coating film forming apparatus and the coating method of the piston for the compressor configured as described above are as follows.

First, in order to form a coating film by applying a coating to the coating portion 110 of the piston 100 using the coating apparatus according to the present invention, first, the piston 100 is rotated to the support members 31 and 32 using the driving unit. Let's do it. The piston 100 may be rotated by rotating the support member 32 or 31 supported by the frame 24.

As shown in FIG. 5 in the state in which the piston 100 is rotated as described above, the nozzle 42 is lowered by the lifting means 41 of the nozzle unit 40 and the piston 100 is coated through the discharge hole of the nozzle. A high viscosity paint is discharged and applied to the outer circumferential surface of the part 110. In this case, when the width of the coating part is variable, it is preferable to use only the solenoid valve installed in the discharge part so that the coating material can be discharged only.

As described above, the coating material applied from the nozzle 42 advances the braid by the front and rear moving means 51 at the same time as before or after reaching the position corresponding to the braid or at the same time as the lowering of the nozzle. do. In this case, the coating material applied to the coating part 110 by the braid 52 is spread and applied to the coating part of the piston 100.

On the other hand, the amount of paint discharged from the nozzle 42 is sufficient to be sufficient to apply the coating. When this amount of paint is discharged, the nozzle 42 is raised by the elevating means. And the braid 52 for inventing the paint is close to the coating portion 110 while the piston 100 is rotated two to three to expand the paint.

When the spreading of the paint is completed as described above, the piston which retracted the braid by the forward and backward means is unloaded.

The coating film forming method and apparatus of the compressor according to the present invention configured as described above, in forming a coating film by coating the coating on the coating of the piston, the loss of the paint to 1/4 to 1/5 compared to the conventional spray method It can be reduced, it is possible to form a uniform coating film on the coating portion of the peace. In addition, since the coating film can be completed by one coating, there is an advantage of reducing the process and the labor required by the formation of the coating film.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom.

Claims (6)

A support step for rotatably supporting the compressor piston; Injecting paint by using a nozzle to the outer peripheral surface of the coating portion of the piston while rotating the piston, The method of forming a coating film of a piston for a compressor, comprising the step of forming a coating film on the coating by expanding the injected paint by braiding the coating to the coating of the piston in the process of injecting the coating liquid. The method of claim 1, Method of forming a coating film of the piston for the compressor, characterized in that it further comprises a drying step of drying the coating film of the piston after the expansion of the coating film of the piston, and a firing step of firing the dried coating film. The method of claim 1, Coating method for forming a coating film of the piston, characterized in that it further comprises a coating step of spray coating the coating on the bridge of the piston. A support member for supporting the center of rotation of both end sides of the piston, a drive unit for rotating the piston supported by the support member, a nozzle unit installed close to the coating part of the piston, and elevating a predetermined lifting means; Compression characterized in that it comprises a paint spreading means that is installed to correspond to the coating portion of the piston and forward and backward to the coating portion of the piston by a predetermined forward and backward means and comprises a braid to form a coating film of uniform thickness on the outer peripheral surface of the coating portion. Apparatus for forming a coating film for use. The method of claim 4, wherein The driving unit is a coating film forming apparatus for a compressor, characterized in that it comprises a motor for rotating at least one of the support members supported on the frame. The method of claim 4, wherein The nozzle unit is installed on top of the coating portion, the coating film forming apparatus for a compressor, characterized in that it comprises a nozzle having a plurality of paint outlets, and elevating means for elevating the nozzle.