JPH07127747A - O-ring - Google Patents

Abstract

PURPOSE:To increase chemical resistance, insulation resistance, thermal resistance, abrasion resistance, and mechanical strength, etc., of O-rings by chemically vapor-depositing(CVD) a polyparaxylene resin on the surface of the O-rings. CONSTITUTION:O-rings 1, 2, and 3 are arranged around the projected part 10' of a columnar member 10 at specified intervals, and a cylindrical member 20 is closely fitted slidably and rotatably on the O-rings. Also gas circuits 11 and 21 are connected to each other through an area A between the O-rings 1 and 2, and gas circuits 12 and 22 are connected to each other through an area W between the O-rings 2 and 3. Then a polyparaxylene resin is applied by chemical vapor deposition on the surface of the O-rings 1 to 3. Thus various properties such as chemical, electrical, thermal, and mechanical ones are increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an O-ring, more specifically to chemical resistance, abrasion resistance, insulation, heat resistance, slidability, and mechanical strength. In other words, it relates to an O-ring having a wide range of application, which is excellent in various chemical, electrical, thermal, and mechanical properties.

[0002]

O-rings are well known, for example,
A gap between the cylindrical body and the columnar body, which is interposed between the cylindrical body and a columnar member that is slidably or rotatably accommodated in the cylindrical body relative to the cylindrical body. It is used for preventing (sealing) the flow of air, liquid, etc.

Thus, as described above, the O-ring is interposed between the two objects that slide or rotate relative to each other to seal the gap between the objects, and the gas or gas is passed through the gap. It is intended to prevent the liquid from flowing, but when a chemical is mixed in the gas or liquid, for example, when the liquid contains alcohol or a sterilizing liquid,
The O-ring is required to have chemical resistance, moisture resistance, corrosion resistance and the like.

Further, in general, the outer peripheral surface of the O-ring is in contact with the inner peripheral surface of the cylindrical body and is also slid or rotated with the inner peripheral surface to be in contact with the wear resistance. , Mechanical strength (durability), slidability, etc. are required.

[0005]

The O-ring as described above is also used in various dental treatment instruments, for example, a joint of a multi-joint turbine, a joint of a syringe or the like, It is used in various places such as attachment joints of vacuum nozzles and requires chemical resistance, wear resistance, life resistance, slidability, etc. There was no such O-ring.

[0006]

In order to solve the above-mentioned problems, the present invention is characterized in that a polyparaxylylene resin is chemically vapor-deposited (CVD) on the surface of an O-ring.

[0007]

Function: Polyparaxylene resin is chemically vapor-deposited (CVD) on the surface of the O-ring to improve various chemical, electrical, thermal and mechanical properties of the O-ring.

[0008]

1 is a sectional view of an essential part for explaining an example of use of an O-ring according to the present invention. FIG. 1 shows a gas between two relatively rotatable members 10 and 20. FIG. 3 is a view showing an example of use of an O-ring that enables the flow of liquid, and in the drawing, reference numerals 1, 2 and 3 are O-rings arranged around the protrusion 10 ′ of the columnar member 10 at a predetermined interval. . 1
Reference numeral 1 is a gas flow channel provided in the member 10, 12 is a liquid flow channel, the gas flow channel 11 is open in a region A partitioned by the O-rings 1 and 2, and the liquid flow channel 12 is the O-rings 2 and 3. It has an opening in a region W partitioned by.

Reference numeral 20 denotes a protrusion 10 'of the columnar member 10.
A tubular member that is slidably and rotatably coupled to the inside of the tubular member 20. The tubular member 20 has a gas flow path 21 that opens to the region A when coupled to the protrusion 10 ', and It has a liquid channel 22 that opens to the region W.

Therefore, when the members 10 and 20 are connected as shown in the drawing, the gas flow passage 11 of the member 10 and the gas flow passage 21 of the member 20 are intervened by the region A surrounded by the O-rings 1 and 2. And at the same time, the liquid flow path 12 of the member 10 and the liquid flow path 22 of the member 20 are connected via the region W surrounded by the O-rings 2 and 3, and these members 10 and 20 are connected.
Even if the and are rotated relatively, gas or liquid may leak to the outside,
There is no mixing of gas and liquid.

FIG. 1 shows only one usage example of the O-ring, and there are various ways of using the O-ring other than the above. For example, in the illustrated usage example, the O-ring is used in the gas or liquid. If a chemical or the like is mixed, the O-ring may be attacked by the chemical and the gas and the liquid may be mixed or leaked to the outside. Further, since the outer peripheral surface of the O-ring is slidably and rotatably in contact with the inner peripheral surface of the member 20, the outer peripheral surface of the O-ring is worn out and the gas or liquid is not exposed to the outside after long use. There is a risk that the gas may leak into the air, or the gas and liquid may mix. Further, there is a problem that it is damaged by a mechanical shock or the like, and the O-ring absorbs water to swell and deteriorates slidability.

The present invention provides an O-ring which simultaneously solves the problems of the conventional O-ring as described above, and a polyparaxylylene resin is chemically vapor-deposited (CVD) on the surface of the O-ring which has been conventionally known. ) Is coated with.

Chemical vapor deposition of parylene resin not only enables uniform coating without pinholes, which is difficult with conventional liquid coating or powder coating, but is also excellent in preventing permeation of water vapor and various gases and is resistant to chemicals. It is possible to perform a coating that is excellent in wear resistance, heat resistance, insulation and the like.

[0014]

As is apparent from the above description, according to the present invention, moisture resistance, corrosion resistance, slidability, chemical resistance, abrasion resistance, long life, etc. are excellent, and further insulation against metal surfaces is achieved. It is possible to provide an O-ring that has excellent properties and has a very wide range of applications.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part for explaining an example of use of an O-ring to which the present invention is applied.

[Explanation of symbols]

1, 2, 3 ... O-ring, 10 ... Columnar member, 20 ... Cylindrical member, 11, 21 ... Gas circuit, 12, 22 ... Liquid circuit.

Claims (1)

[Claims] 1. An O-ring having a surface on which polyparaxylylene resin is chemically vapor deposited (CVD).