JP3106204B2 - Sliding surface structure of gas stopper and molding method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas stopper and a method of adjusting a sliding surface thereof, and more particularly to a method of forming a gas stopper made of brass and a sliding surface of a stopper or a gas stopper body in the gas stopper. .

[0002]

2. Description of the Related Art A gas stopper comprises a stopper and a gas stopper body which slidably accommodates the stopper. Recently, a method of securing airtightness between the stopper and the gas stopper body by using a synthetic resin coating layer formed on at least one of these sliding surfaces and a lubricating sealing aid such as silicone oil is used. Things are widespread. In this case, the combination of the coating layer and the sealing aid prevents leakage from the gas stopper main body to the outside of the circuit and exhibits a circuit shut-off function in a valve closed state. In addition, when the amount of the sealing aid decreases, the coating layer exhibits the sealing property and the lubricating property, and the sealing property of the sliding surface is maintained for a long time.

However, if the coating layer peels off or is damaged from the base material of the sliding surface, the above-mentioned sealing function is impaired and the function as a gas stopper is impaired. Similar inconveniences occur if the coating layer forming surface is damaged. Therefore, the underlayer on which the coating layer is formed is replaced with a porous layer (including the case of an uneven surface in the claims and the following description).
In order to improve the bonding force between the coating layer and the underlayer, a proposal has been made.

[0004] For example, in the case of forming a metal porous layer as disclosed in Japanese Patent Publication No. 1-55831, although the bonding force between the coating layer and the porous layer is improved, this porous layer is formed. Since this is another layer bonded and formed on the surface of the brass, which is the base material of the sliding surface, the problem of separation between the surface of the brass and the porous layer remains. In order to solve such a problem, a configuration in which irregularities are provided by shot peening or shot blasting on the surface of a metal stopper is also proposed in JP-A-63-43070. Since the cross-sectional shape of the recess gradually increases from the bottom wall toward the open end, the mechanical bonding force between the coating layer and the uneven surface becomes insufficient. When viewed in this manner, it can be said that the coating layer itself is harmful. Therefore, a configuration in which the sealing agent is directly held on the uneven surface is also conceivable. However, in the case of the above configuration, since the concave portion of the porous layer has a shape that is shallow and wide, the sealing aid is easily lost, and the sealing property is prolonged. Cannot be stabilized over time.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is intended to stabilize the sealing performance of a sliding surface for a long term in a "gas stopper in which a stopper is slidably housed in a gas stopper body". The first problem is to make sure that the sealing aid is securely held on the sliding surface even when the coating layer is not formed. It is an object of the present invention to provide a substrate having sufficient mechanical strength and preventing peeling from an underlayer.

[Invention of claim 1]

[0007]

[Technical Means] The technical means of the present invention for solving the above-mentioned problem is that the gas plug body (1) or the plug body (2) is made of an alloy made of a plurality of metals having different melting points or boiling points, The surface of the alloy was a porous surface from which metal components having a low melting point or a low boiling point were removed, and a sealing aid penetrated and held in the concave portions of the surface of the porous layer. "

[0008]

The above technical means operates as follows. A porous layer is formed on at least one sliding surface of the gas plug body (1) or the plug (2), and a sealing aid is intruded and held in a concave portion on the surface of the porous layer. In this case, the sealing aid exerts a sealing function.

Since the porous layer is formed by removing a metal component having a low melting point or a low boiling point from the underlying alloy in which the porous layer is formed, the porous layer and the underlying layer have an integrated structure in terms of organization. ing. In addition, since the porous layer has a metal component having a low melting point or a low boiling point removed from the metal components constituting the base layer, the removed portion becomes a concave portion having a complicated shape. The sealing aid that has been intruded and held in the filled state exhibits sealing performance. And even if the sealing aid layer formed on the boundary between the sliding surfaces of the gas stopper body (1) and the stopper (2) is partially lost due to long-term use,
The sealing aid in the recess is supplied to the boundary layer, and the sealing aid is stably interposed between the sliding surfaces for a long period of time.

[0010]

[Effect] Since the sealing aid is stably interposed between the sliding surfaces for a long period, the sealing performance is stabilized for a long period. Since the porous layer and the underlayer have a structurally integrated structure, the mechanical strength of the porous layer is improved, and the effect is further improved in this respect.

[Invention of Claim 2] This invention solves the same problems as those of the invention of Claim 1 described above, in which a coating layer is provided.

[0012]

[Technical Means] The technical means of the present invention for solving the above-mentioned problem is that the gas plug body (1) or the plug body (2) is made of an alloy made of a plurality of metals having different melting points or boiling points, The surface of the alloy was a porous surface from which metal components having a low melting point or a low boiling point had been removed, and a coating layer made of a synthetic resin was formed on the surface of the porous layer. "

[0013]

The above technical means operates as follows. A porous layer is formed on at least one sliding surface of the gas stopper main body (1) or the plug (2), and a coating layer is formed on the surface of the porous layer. The combination of auxiliaries exerts a sealing function.

Since the porous layer is obtained by removing a metal component having a low melting point or a low boiling point from the underlayer on which the porous layer is formed, the porous layer and the underlayer have a structurally integrated structure. ing. In addition, since the porous layer has a metal component having a low melting point or a low boiling point removed from the metal components constituting the base layer, the removed portion becomes a concave portion having a complicated shape. A part of the coating layer has penetrated into the full state. The intrusion causes the coating layer to mechanically engage with the surface of the porous layer in the peeling direction.

[0015]

[Effect] Since the porous layer is a metal layer similar to the base metal and the porous layer is compositionally integrated with the base metal, there is no fear that the porous layer is peeled off. . In addition, since the porous layer is a metal layer, the mechanical strength becomes sufficient. Further, the porous layer serving as the surface on which the coating layer is formed and the coating layer are mechanically engaged in the peeling direction of the coating layer, so that the bonding strength between the coating layer and the porous layer is sufficient. Therefore, the sealing performance is stabilized for a long period.

[Invention of claim 3] The invention of claim 3 relates to the method of forming the sliding surface of the gas plug according to the invention of claim 2 so that the sliding surface can be easily formed. Is what you do.

[0017]

[Technical Means] The technical means adopted for this purpose is described in "Method of forming a sliding surface of a gas stopper in which a stopper is slidably housed in a gas stopper body, wherein the stopper (2) is heated to the melting point. It is made of an alloy composed of a plurality of different metals, and from the surface of the alloy to a certain depth is heated to the melting temperature of the metal component having a low melting point and is melted and discharged to form a porous surface. To form a coating layer ”.

[0018]

[Function / Effect] In forming a porous layer, a metal component having a low melting point is heated to a certain depth from the surface of the alloy to be in a molten state, and this is melted and discharged.
Removal of low melting point metal is easy. Further, since the porous layer is formed on the sliding surface of the plug body as described above, the workability is simpler than the case where the porous layer is formed on the sliding surface of the gas stopper body. .

As a method of the melt outflow, a method of causing the melt to flow out by applying a centrifugal force under heating conditions,
After heating to the melting condition, a method of reducing the atmospheric pressure can be adopted. Thereafter, when a coating layer is formed on the porous surface by a method similar to the conventional method, a sliding surface is formed on the surface of the plug.

[Invention of Claim 4] The invention of Claim 4 solves the same problem as the invention of Claim 3, and focuses on the boiling point of the metal component constituting the alloy.

[0021]

[Technical Means] The technical means adopted for this purpose is described in "Method of forming a sliding surface of a gas stopper in which a stopper is slidably housed in a gas stopper main body. It is made of an alloy composed of a plurality of different metals, and a metal surface having a low boiling point is vaporized and escaped by maintaining vaporization conditions of a metal component having a low boiling point from the surface of the alloy to a certain depth to form a porous surface. A coating layer made of a synthetic resin is formed on the porous surface. "

When this means is employed, when heated to a predetermined temperature, a metal layer having a low boiling point vaporizes and escapes to form a porous layer, which has the same function and effect as the third aspect of the present invention. Becomes

[0023]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. In this embodiment, as shown in FIG. 1, the present invention is applied to a gas stopper in which a gas stopper body (1) is provided with a stopper (2) having a passage hole (21). The gas stopper main body (1) has a configuration in which a similar truncated cone-shaped plug (2) is rotatably housed in a truncated cone-shaped plug housing portion (11). Further, an upstream flow path (12) and a downstream flow path (13) inserted into the plug housing section (11) are formed in the gas plug body (1), and open ends of these flow paths are formed. They correspond to the openings at both ends of the passage hole (21) formed in the plug (2).

In this embodiment, a gas stopper body (1) and a stopper
(2) is composed of seventy-three brass, copper: 70
%, Zinc: 30% alloy. Then, a porous layer (3) is formed on the surface of the plug (2), and a coating layer is formed on this surface.
(G) is formed to form the sliding surface. This porous layer
As shown in FIG. 2 and FIG. 3- (b), (3) is set to a layer having a depth of about 1 to 3 μm from the surface of the plug (2), and most of the layer becomes a copper component. The underlayer is made of the brass. Therefore, the copper component of the porous layer (3) is integrally continuous with the alloy component (brass component) of the underlayer.

The porous layer (3) is formed by removing the zinc crystals from a mixed layer of copper and zinc crystals, and the zinc crystal-removed portion becomes a recess or a cavity. Becomes the holding function part (31), and has a complicated sectional shape corresponding to the shape of the zinc crystal. A coating layer (G) made of a synthetic resin is formed on the porous layer (3) configured as described above, and a plug is inserted with a sealing aid such as silicone oil interposed therebetween.
When (2) is accommodated in the plug housing section (11), the plug housing section (11)
The seal between the inner peripheral surface of the plug and the outer peripheral surface of the plug (2) is secured by the coating layer (G) and the sealing aid.

The following method can be used to form the porous layer (3). In the case of Shichisan brass, in the range of 930 ° C to 950 ° C, molten zinc and a solid solution of copper and zinc coexist. Therefore, as shown in FIG.
(2) is accommodated in a rotating drum (41) in a heating furnace (4). Then, hot air at a certain level higher than the above temperature (about 1000 ° C.) is supplied into the heating furnace for several minutes to 20 minutes. As a result, a layer in a certain range from the surface of the plug (2) is heated to the above-mentioned temperature, and a molten layer (22) is formed as shown in FIG.
Then, when the rotating drum (41) is rotated for a certain period of time from the end of the hot air supply, the zinc component in a molten state flows out due to centrifugal force, and a small concave portion is continuously formed on the surface of the plug (2). The material layer (3) is formed.

A coating layer is formed on the surface of the body of the plug (2).
Forming (G) and incorporating it into the plug housing (11) of the gas plug body (1), it becomes a gas plug, and the flow path in the gas plug body (1) depends on the turning posture of the plug (2). Is opened and closed. Various materials can be used as the coating layer (G). When the coating layer (G) is a polyparaxylylene resin layer, the following method can be used. When a large number of plugs (2) and (2) on which the porous layer (3) was formed as described above were accommodated in a low-vacuum paraxylylene vapor deposition tank and chemically vapor-deposited under predetermined conditions, FIG. The coating layer (G) made of the polyparaxylylene resin shown can be formed. In the case of this coating layer (G), as shown in the figure, the surface also has irregularities following the irregularities of the porous layer (3), and these irregularities serve as a holding portion for the sealing aid.

In the above porous layer forming method, molten zinc is removed by hot air and centrifugal force. However, as shown in FIG. 7, a large number of brass plugs (2) are placed in a heating furnace (4). (2) is accommodated, and the inside of the heating furnace (4) is heated to a predetermined degree of vacuum by a vacuum pump (P) and heated by a heater (H).
When the temperature is maintained at 450 ° C. and 1/100 torr for about 3 hours, zinc having a low boiling point is vaporized, and the metal component having a low boiling point is vaporized and escaped to form the porous layer (3).

In this case, by increasing the degree of vacuum as described above, zinc can escape even when the heating temperature is lowered as compared with the method of the above embodiment shown in FIG. Therefore, the dimensional accuracy does not easily decrease due to the processing. By the way, due to the formation of the porous layer (3), the surface state measured by the surface roughness measuring device changed from the state of FIG. 3- (a) as shown in FIG. 3 (b). From this, it is clear that the porosity was promoted by the vaporization escape of a part of the metal component.

According to this method, the porous layer (3) can be formed on the sliding surface of the gas stopper body (1). In the above embodiment, the case where the coating layer (G) is formed on the porous layer (3) has been described, but the porous grease (3) formed as described above is provided with a seal grease as a sealing aid.
(S) is applied so as to fill the holding function part (31) formed of a concave portion or a cavity formed in the porous layer (3), and the sliding surface of the gas stopper body (1) and the stopper are (2) The seal between the sliding surfaces may be ensured. (See FIG. 8) In this case, after the seal grease (S) was applied to the porous layer (3) to fill the seal grease (S) in the holding function part (31), the surplus was removed. The plug housing portion (11) in the state and the plug (2) may be combined. In this case, the seal grease (S) adhered and left on the surface of each sliding surface secures the seal and lubrication of the boundary surface between the sliding surfaces, and the sealing function is maintained when the seal grease (S) in this portion is consumed. The seal grease (S) in the section (31) is supplied.

The porous layer (3) of the plug body (2) allows seal grease (S) to penetrate therein, and the porous layer (3) of the other gas plug body (1) has a coating layer (3). It is also possible to set the configuration forming G) or the relationship opposite thereto. Further, a solid lubricant may be used instead of the seal grease (S). In this case, the solid lubricant is more likely to fill the inside of the holding function portions (31) (31) where the sealing aid is more complicated than a liquid or paste-like one.

As a constituent metal of the gas plug main body (1) or the plug body (2), it goes without saying that other alloys other than the above-mentioned 73-brass can be used as long as the melting temperatures of the components are different. No. In the above embodiment, the stopper (2) is a rotary stopper. However, it is needless to say that the stopper (2) can be a direct acting stopper.

[Brief description of the drawings]

FIG. 1 is a sectional view of a gas stopper according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the plug (2).

FIG. 3 is an explanatory diagram of a surface roughness before and after a porous treatment.

FIG. 4 is an explanatory view of a method for forming a porous chamber layer (3).

FIG. 5 is a cross-sectional view of the plug (2) during the processing of the porous layer (3).

FIG. 6: Coating layer made of polparaxylylene resin
(G) Enlarged sectional view of the sliding surface formed

FIG. 7 is an explanatory view of another example of the method for forming the porous layer (3).

FIG. 8 is an explanatory view of a main part when a porous layer (3) is filled with seal grease (S).

[Explanation of symbols]

 (1) ・ ・ ・ ・ Gas plug body (2) ・ ・ ・ ・ Plug body (3) ・ ・ ・ ・ Porous layer

Continuing from the front page (72) Inventor Masahiro Ogawa 18-1, Hanamikatoba, Minami-ku, Kyoto-shi Inside Fujii Alloy Co., Ltd. (72) Inventor Takayuki Nakanishi 4-1-2, Hiranocho, Chuo-ku, Osaka Osaka Within Gas Co., Ltd. (72) Nobuo Tanaka, Inventor 4-1-2, Hirano-cho, Chuo-ku, Osaka In-company (56) References JP-A-4-296262 (JP, A) JP-A-3-17685 (JP, A) JP-A-54-91735 (JP, U) JP-A-55-152863 (JP, U) ) JP-B-59-752 (JP, B2) JP-B-58-45626 (JP, B2) JP-B 63-7939 (JP, Y2) JP-B 4-34281 (JP, Y2) JP-B 61- 44036 (JP, Y2) Jikgyo 2-14702 (JP, Y2) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16K 3/00-5/22 F16K 11/00-11/24 F16K 25/00

Claims (6)

(57) [Claims] A gas plug of a type in which a plug is slidably housed in a gas plug main body, wherein the gas plug main body (1) or the plug (2) is made of an alloy made of a plurality of metals having different melting points or boiling points. And a sliding surface structure of a gas stopper in which the surface of the alloy is a porous surface from which a metal component having a low melting point or a low boiling point is removed, and a sealing aid is intruded and held in a concave portion of the surface of the porous layer. 2. A gas plug of a type in which a plug is slidably housed in a gas plug main body, wherein the gas plug main body (1) or the plug (2) is made of an alloy made of a plurality of metals having different melting points or boiling points. And a sliding surface structure of a gas stopper in which the surface of the alloy is a porous surface from which a metal component having a low melting point or a low boiling point is removed, and a coating layer made of a synthetic resin is formed on the surface of the porous layer. 3. A method of forming a sliding surface of a gas stopper in which a stopper is slidably housed in a gas stopper body, wherein the stopper (2) is made of an alloy made of a plurality of metals having different melting points. A gas stopper that is heated from the alloy surface to a certain depth to the melting temperature of the metal component having a low melting point and melted and flows out to form a porous surface, and a synthetic resin coating layer is formed on the porous surface. How to form the sliding surface. 4. A method for forming a sliding surface of a gas stopper in which a stopper is slidably housed in a gas stopper body, wherein the stopper (2) is made of an alloy made of a plurality of metals having different boiling points. By maintaining the vaporization conditions of the low-boiling metal component from the alloy surface to a certain depth, the low-boiling metal component is vaporized and escaped to form a porous surface, and the porous surface is made of synthetic resin for sealing. A method for forming a sliding surface of a gas stopper in which a coating layer is formed. 5. The sliding surface structure of a gas stopper according to claim 2, wherein the coating layer is a polyparaxylylene resin layer. 6. The gas plug according to claim 3, wherein the gas plug (2) is accommodated in a low-vacuum paraxylylene vapor deposition tank and subjected to chemical vapor deposition to form a coating layer (G). Molding method of the sliding surface.