JP2000263336A - Manufacture of piston and refrigirator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a piston stably usable for a long period at a good yield by roughing a slide surface of a piston substrate by a chemical treatment and making a piston substrate surface suitable for an adhesion by an adhesive. SOLUTION: A chemical treatment for roughing a surface is carried out for a compression piston substrate 34a. Two cylindrical resin members 34b are fixed to the compression piston substrate 34a which has been subjected to chemical treatment at a predetermined distance by an adhesive. The surface of the piston 34a to which the resin member 34b is fixed is polished to form a compression piston 34. Accordingly, according to the manufacture order, a piston to which a piston seal is strongly fixed and formed on the surface is obtained at an extremely high yield.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a piston having a piston seal made of resin on a sliding surface, for example, used for a compressor of a small refrigerator, and a compressor using such a piston. The present invention relates to a refrigerator including:

[0002]

2. Description of the Related Art Some pistons are provided with a piston seal made of resin on a sliding surface thereof. For example, in a compressor for a small refrigerator, a compression piston having a resin piston seal provided on a sliding surface thereof is used in order to improve a seal between the compressor and a cylinder portion.

Heretofore, this kind of compression piston has been manufactured in the following procedure. First, the sliding surface of the compression piston base is subjected to blast cleaning using glass beads or the like, and then to organic solvent cleaning. Then, a cylindrical resin member serving as a piston seal is fitted to the sliding surface of the compressed piston base body after cleaning, and is fixed with an adhesive. Thereafter, the compression piston is obtained by polishing the surface of the resin member so as to have a predetermined outer diameter.

[0004]

In the above-mentioned manufacturing procedure, the blast cleaning is performed because the anchor effect of the adhesive is expected. However, when manufactured by the above manufacturing procedure, the resin member often cannot be bonded well. Also, at the time of manufacture,
Even if it appears that the adhesive is adhered in a good condition, the piston seal may peel off during continuous operation, and the overall yield of the conventional manufacturing procedure is about 60%. .

It is an object of the present invention to provide a piston manufacturing method capable of manufacturing a piston which can be used stably for a long period with a high yield.

[0006]

In order to solve the above-mentioned problems, according to the present invention, a piston provided with a piston seal made of resin on its sliding surface is roughened by chemical treatment on a sliding surface of a piston base. A surface roughening step, a fixing step of fixing a cylindrical resin member to the biston substrate treated by the surface roughening step with an adhesive, and an outer diameter having a predetermined value. A polishing step of polishing the surface of the resin member fixed to the piston base in the fixing step.

That is, in the present invention, when manufacturing the piston, the sliding surface of the piston base is roughened by chemical treatment instead of blast cleaning. According to this manufacturing method, the surface of the piston base can always be made suitable for bonding with an adhesive, so that a piston that can be used stably for a long time can be manufactured with high yield.

[0008] The chemical treatment used in the roughening step may be any treatment that can roughen the sliding surface of the piston base. What roughens by processing can be adopted. In the case where a surface roughening step of performing such an acid treatment is employed, a treatment using an acid obtained by diluting sulfuric acid with water can be used as the acid treatment.

[0009] The refrigerator of the present invention is configured using a compressor using a piston manufactured by the above manufacturing method. Therefore, the refrigerator of the present invention functions as a refrigerator having a long life (it is unlikely that a failure related to the piston seal of the compression piston occurs).

[0010]

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

First, the configuration of a compressor using a piston manufactured by the manufacturing method according to the present invention will be described with reference to FIG.

The present manufacturing method is a method for manufacturing a piston having a piston seal made of resin on its sliding surface, and for example, for manufacturing a compression piston 34 of the compressor 11 for a small refrigerator as shown in the figure. Used for

The compressor 11 has a left-right symmetric structure, and is fixed to the center portion 31, the cylinder portion 32 fixed to each surface of the center portion 31, the pressure-resistant casing 40, and the pressure-resistant casing 40. Hermetic Connector 41
Is provided. The center portion 31 is a member provided with a cavity portion 56 and the like that connects the compression space 52 (the space defined by the cylinder portion 32 and the compression piston 34) to the space inside the expander (not shown) via the capillary tube 12. It is.

The hermetic connector 41 is a member that forms a closed space in which the cylinder portion 32 and the like are housed together with the pressure-resistant casing 40. Hermetic connector 41
Is provided with a spring seat 42 having a spiral groove formed on the surface thereof and two current introduction terminals 43. Cylinder part 3
2 has a columnar cavity 58 connected to the cavity 56 of the center section 31 and a groove 59 concentric with the cavity 58. An annular magnet 33 is attached to the cylinder portion 32 so as to form an inner wall outside the groove 59.

The compressor 13 fixes the compression piston 34 inserted into the cylindrical cavity 58 of the cylinder portion 32, the annular movable coil 36 inserted in the annular groove 59, and the compression piston 34 and the coil 36. A member 35 is provided. Note that a cylindrical spring seat 37 having a spiral groove formed on the outer periphery thereof is attached to the compression piston 34 so as to be coaxial with the spring seat 42. Further, the compressor 13 connects a coil spring 38 having both ends to a spring seat 37 fixed to a compression piston 34 and a spring seat 42 fixed to a hermetic connector 41, a movable coil 36, and a current introduction terminal 43. And a lead wire 39.

The compression piston 34 is manufactured according to the procedure shown in FIG. That is, first, a chemical treatment for roughening the surface is performed on the compression piston base 34a. In this embodiment, a treatment using an acid obtained by mixing sulfuric acid and water at a ratio of 3: 1 is performed as the chemical treatment.

Next, the compression piston substrate 3 after the chemical treatment
4a, two columnar resin members 34b are fixed with an adhesive at a predetermined distance. The compression piston 3 to which the resin member 34b is fixed so as to have a predetermined outer diameter.
The surface of 4a is polished to form the compression piston 34.

After employing this manufacturing procedure, the formation of the piston seal has never been unsuccessful. Therefore, it can be said that according to the present manufacturing procedure, a formed piston in which the piston seal is firmly fixed to the surface thereof can be obtained with a very high yield as compared with the conventional manufacturing procedure.

In the above-mentioned manufacturing procedure, a treatment solution used for the chemical treatment is prepared by diluting sulfuric acid with water. It has been confirmed that other processing solutions can be used. In the above-described compression piston described as the embodiment, two resin members are attached. However, when this manufacturing procedure is adopted, the number of resin members fixed to the piston is not limited to two. That is natural.

[0020]

According to the manufacturing method of the present invention, a piston having a piston seal firmly fixed on its surface can be manufactured at an extremely high yield.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a compressor included in a refrigerator according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a manufacturing procedure of a compression piston used in the compressor according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Compressor 12 Capillary tube 27 Seal member 31 Center part 32 Cylinder part 34 Compression piston 34a Compression piston base 34b Resin member 36 Coil 38 Coil spring 39 Lead wire 40 Pressure-resistant casing 41 Hermetic connector 42 Spring seat 43 Current introduction terminal

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yoshitaka Ikuta 63-30 Yuyugaoka, Hiratsuka-shi, Kanagawa Prefecture Sumitomo Heavy Industries Machinery Co., Ltd. No. 30 Sumitomo Heavy Industries Machinery Co., Ltd. Hiratsuka Plant F-term (reference) 3J044 AA18 BB37 BC01 CA40 DA10 EA02

Claims (4)

[Claims] 1. A method of manufacturing a piston having a piston seal made of resin on its sliding surface, comprising: a roughening step of roughening a sliding surface of a piston base by a chemical treatment; A fixing step of fixing a cylindrical resin member to the piston base processed by the step with an adhesive, and the fixing step fixed to the piston base by the fixing step so that an outer diameter becomes a predetermined value. A polishing step of polishing a surface of a resin member. 2. The method according to claim 1, wherein the chemical treatment in the roughening step is an acid treatment. 3. The method according to claim 1, wherein the acid treatment is a treatment using an acid obtained by diluting sulfuric acid with water. 4. A refrigerator comprising a compressor using the piston according to any one of claims 1 to 3.