JPS61130674A - Adherence preventing screw cock - Google Patents

Abstract

PURPOSE:To prevent mutual biting of sliding surfaces by fixing a cock holder to the sliding surface of a main body, supporting a cock body through a ring, and uniformalizing a grease film on the sliding surface. CONSTITUTION:A cock is divided into a cock body 11 and a cock holder 12, which are laid one over the other to be subjected to machining or lapping. After the completion of machining, the cock holder 12 is installed at the sliding surface 9 of the main body. Further, a metallic or synthetic resin ring 13 is installed thereon, grease is applied to the sliding surface of the cock holder 11, and the cock holder is assembled to the main body. The relation ship between the grease layer A and the thickness of the ring 13 is that when a taper is 1/N, B=AX2N.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] Screw cocks used as main valves for city gas piping, gas meters, and various gas appliances can be left unattended for long periods of time in the event of an emergency such as a fire or unexpected disaster. The invention relates to a highly safe cock that can be operated reliably and prevents sticking.

[Prior art]

Conventional screw cocks are JIs B compliant as city gas valves.
2120 (Screw cock) K1 cock Each part and each food performance are specified. However, with the rapid urbanization of city gas, there are changes in the environment and harsh usage conditions, and in reality, gas companies are demanding even higher quality screw cocks.

Even if the quality of conventional cocks is JIS compliant, not only will the opening/closing torque increase if left unused for a long period of time, but the main body and sliding surface may become stuck in places where they are exposed to heat. However, it has the disadvantage that it cannot be opened or closed.

[The problem that the invention attempts to solve]

The cause of the sticking of such conventional cocks is the quality of the metal touch accuracy of the main body and the sliding surface of the taper.

When assembling the cock, special grease is applied to the sliding surface to form a grease film, and the sliding surface f pressure is generally 1.
, 0 kff/, ~1゛, 5 degrees of pressure to maintain sealing performance and operability. For this reason, if left for a long period of time, the sliding surface is tapered, so the physical properties of the grease film and the grease film change, and the main body sliding surface and shear sliding surface will change.
The body is generally made of cast iron or malleable cast iron, and the tile is made of copper-based material, and in the extreme, boundary contact occurs, causing galling and sticking. For this reason, it is currently necessary to improve the roundness, roughness, waviness, and taper of the sliding surface, but this is extremely difficult from both a technical and cost standpoint. Therefore, the present invention provides a screw cock that uniformly stabilizes the grease film on the sliding surface and prevents the sliding surface from becoming barred.

[Effect]

Technical means for preventing scuffing on the taper sliding surface of the screw cock and making the grease film uniform will be explained with reference to FIG. 1, a partially enlarged view of the taper sliding surface of the screw cock.

The nine sliding surfaces of the main body fit into the plug sliding surface 10 in a tapered shape, and a dedicated grease layer is formed between these sliding surfaces, and the plug is pressurized from above, so that the sliding surface pressure is 1. o proboscis ~1. l~ is held. If this state is maintained for a long period of time, the grease layer will escape in the vertical direction, causing boundary contact between the main body sliding surface 9 and the plug sliding surface 10 at a localized part of the sliding surface, causing the plug to close. As it rotates, it causes a galling phenomenon, increases the rotational torque, and eventually becomes stuck. In order to prevent this phenomenon, it is necessary to improve the accuracy of the sliding surface, but perfecting it requires high costs and is not suitable for actual circumstances. For this reason, the present application stabilizes the above-mentioned grease layer, and the principle thereof is shown in Fig. 2, a state diagram during machine rod processing or lapping processing, Fig. 83, a state diagram during the sliding surface assembly of the present application, and Fig. 4, the grease layer. This will be explained using a state diagram of No. 1.

In the present application, as is clear from Fig. f$2, a stopper divided into a shell body 11 and a stopper receiver 12 is machined or wrapped. After this processing is completed, the main body is divided into parts, and as shown in FIG. Furthermore, a ring 13 made of gold JrE or synthetic resin is attached, and grease is applied to the sliding surface of the body 11 for assembly.

In this structure, the thickness B of the grease layer A and the ring 13 is
As is clear from FIG. 4, in the case of Tebayu, the relationship B=AX2N holds true.
/8, if the grease layer A is 6 μ, the ring thickness B = 5 μ x 16 = 48 μ, and the thickness should be about 0°05. A ring with this thickness can be made of stainless steel, copper,
It can be easily manufactured from aluminum or other resin such as Teflon.

Since the stopper receiver 12 is fixed to the main body sliding surface 9, even if the orange is pressurized, the fitting position will not change and the grease layer will not be pushed out. Furthermore, the main body sliding surface 9 and the shear sliding surface 10 do not come into contact with each other in a metal-touch manner. Since the sliding surfaces of the main body and the stopper are machined so that the stoppers are integrated, the sliding surfaces of each stopcock are uniform and there is no variation in accuracy. [Effects of the Invention] This invention has the following advantages. It has a unique effect.

t A grease film on the tapered sliding surface, which was unimaginable with conventional screw cocks, has the necessary thickness, is uniform, and is stable for a long period of time.

2. Due to the above, it is also possible to increase the working pressure depending on the physical properties of the grease.

3. Also, since the sliding surface is stable, the closing performance and durability of the cock can be greatly improved.

4. The cock of the present invention does not require special production techniques and is manufactured by conventional methods, so it is suitable for mass production.

5. Conventional cocks may become unable to open or close if left unattended for a long period of time, and city gas piping requires an emergency shutoff function for safety reasons, making them extremely unsafe. , it is possible to prevent these from sticking, making it a highly safe cock.

6. The cock of the present invention is an extremely economical cock because only a part of the plug structure of the conventional cock needs to be changed.

〔Example〕

Figure 5 is a cross-sectional view of the screw cock according to the embodiment of the present application.The main body 1 is generally made of cast iron, malleable cast iron, bronze, etc., and pipe threads 2 are provided at both ends between the faces, and in the center. is bulkhead 3,
6. A flow port 4 is provided, and a tapered stopper 5 is attached. The plug 5 is provided with a passage port 6, and the main body passage port 4
, and rotation of the stopper 5 through 90 degrees will, in particular, cause fluid closure or passage.

The handle 7 is joined to the main body 1 and further engages the stopper 5,
The handle rotation (90) is transmitted to the stopper 5 to open and close the stopcock.

A spring 8 is installed between the handle 7 and the stopper 5 to maintain a surface pressure of 1 kpf on the main body sliding surface 9 and the stopper sliding surface 10.
A special grease is applied to each of the two sliding surfaces to form a grease film.

In contrast to the basic structure described above, the structure of the cock of the present invention is, as is clear from the drawings, that the stopper 5 consists of a stopper body 11, a holder 12, and a ring 13.

The effect of the present application is as explained in the previous section, but the actual operation will be explained.

Figure f$6 shows the structure during machining or lapping work on the sliding surface 10 of the plug. As is clear from the figure (in advance, the joint 14 between the stopper 11 and the stopper receiver 12 is machined perpendicular to the stopper axis, is tightened with a nut 15 and screwed K, and is integrated into one body with the sliding surface 9 of the main body and the taper). The degree and passage holes 4 and 6 are matched to ensure an accurate fit.

When assembling, the stopper 11 and the stopper receiver 12 are separated, the stopper 11 is first securely fitted to the lower part of the sliding surface of the main body, the ring 13 having a specified thickness is attached, and then the stopper 11 is attached. This structure is assembled by applying grease exclusively for KS on the sliding surface 10 of the plug. This ease of assembly satisfies the functions and effects of the present invention.

[Brief explanation of drawings]

! Figure s1 is a partially enlarged view of the sliding surface of a conventional screw cock taper, Figure 1fJ2 is a state diagram during machining or lapping processing, Figure 6 is a state diagram when the sliding surface is assembled, and Figure 4 is a diagram showing the state of the sliding surface of the present invention when assembled. The principle of the present application will be explained using a layer phase diagram. FIG. 5 is an example of a cross-sectional view of the screw cock according to the embodiment of the present application, and FIG. 6 is an example of a structural diagram during machining of the ore plug sliding surface. Main body: 1 Plug: 5 Main body sliding surface: 9 Orange sliding surface: 10 Plug body: 11 Plug receiver: 12 Ring = 1
3 Figure l Figure 2 Figure 3
Etc. 4 Figure K 〉 ＼ To 9 Ka ) N To (+ ~

Claims (1)

[Claims] In the body and taper sliding surface of the screw cock, the screw structure is divided into a screw body and a screw receiver, leaving an appropriate amount of sealing surface at the bottom end of the screw, and the sliding surface processing is done by integrating the divided parts. , the cock sliding surface configuration is made to match the main body sliding surface.
A ring made of a metal or synthetic resin material having an appropriate thickness is attached to the split portion, and the ring receiver is fixed to the sliding surface of the main body to support the thread body through the ring, and the ring thickness Due to this, when grease is applied to the main body and the sliding surface of the cylinder, a uniform layer of about 1 μm to 10 μm is formed with the grease film, which improves the closeability of the cock, improves operability, and prevents sticking when left unused for a long time. cock.