JPH0434282Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] The present invention relates to a stopper that reduces the turning torque of a stopper. [Prior art] In the conventional kettle, the outer circumferential surface of the stopper 2 shown in FIGS. 3 and 4 matches the inner surface of the tapered opening of the main body.
The sliding surfaces are lapped to fit each other, and approximately 10μ of grease is inserted to ensure sealing performance.The main body is usually made of cast iron, and the plug is made of gunmetal, with a wall thickness of approximately 100 ml, which has good castability. 5mm
3, 4 or more
As shown in the figure, it is generally formed to have a solid cross section except for the flow path 31. [Problem that the invention aims to solve] Kotuku is usually used in the open or closed state,
For example, a stopcock installed just before the gas meter inlet in city gas piping is left open for long periods of time, and the valve is only closed when the gas meter is replaced or when the piping is inspected for leaks every few years. However, during this time, due to changes in the environmental temperature, etc., there is a difference in linear expansion coefficient between the main body and the stopper, so the stopper expands more than the main body, resulting in a thinner grease layer and a large turning torque of the stopper. In some cases, the stopper may become stuck to the main body and cannot be rotated. The object of the present invention is to solve the above-mentioned problems and provide a pot with a small turning torque of the stopper. [Means for solving the problem] The gist of the present invention is that the material of the plug is made of a copper-based alloy, the thickness of the sliding part of the plug is approximately 2 to 4 mm, and the thickness of the plug is approximately 2 to 4 mm. This kotuku is characterized by having a thick part protruding from the top. [Function] In this invention, the wall thickness of the sliding part of the stopper is approximately 2~
By making the wall as thin as 4 mm, the elasticity of the stopper itself increases and it can flexibly respond to sliding surfaces, contributing to improved sealing performance and handle opening/closing torque performance. Furthermore, a thick wall protruding from the inner surface of the plug near the flow path serves as a reinforcing rib, improving dimensional accuracy during processing, and also prevents movement when the inner surface of the plug is filled with a soft material. It can be stopped. [Embodiment] An embodiment of the present invention will be described with reference to FIGS. 1 and 2. The figure shows the plug 2 inside the main body 1 in an open state, and the plug 2
The protrusion 21 on the upper part of the stopper is passed through a through hole provided in the regulating plate 6, and the regulating plate 6 is fixed to the cast iron main body 1, and a spring 4 is inserted between the upper surface of the stopper 2
is inserted and pressed downwardly into the tapered opening 12 of the main body 1. The plug 2 is made of a copper alloy casting such as gun metal, and the wall thickness t of the rotating portion is approximately half that of a conventional general wall thickness, ie, 2 to 4 mm. Further, a thick wall portion 22 is formed around the inlet of the flow path 31 on the inner surface of the stopper 2 . The inside of this thin plug is filled with a soft member 3 such as resin or rubber, and the inner surface corresponding to the flow opening 11 of the main body 1 forms a uniform flow path. This soft member 3 does not move within the plug 2 due to the thick wall portion 22 formed on the inner surface of the plug 2. In the kettle of the present invention, it is possible to use rubber containing expanded graphite as the soft member 3, and in the event of a fire, the rubber containing expanded graphite inside the stopper 2 will expand rapidly, closing the channel 31 of the stopper 2 and preventing secondary Disasters can be prevented. A handle (not shown) is attached to the protrusion 21 on the top of the plug 2, and by rotating this handle by 90 degrees, the plug 2 rotates within the main body 1 and opens the flow path 31.
It is designed to be able to operate from open to closed and from closed to open. Table 1 shows the results of a comparison test with a conventional kettle regarding the number of opening/closing times and rotational torque of the stopper 2 of the kettle of the present invention, which has a nominal diameter of 50A. In addition, the wall thickness t of the stopper 2 of the present invention is 3 mm on average.
The inside is filled with polyethylene resin 3 by injection molding, and the wall thickness t of the conventional Kotuku stopper is the average
It is 5.5mm. Moreover, the entire shape is the same except for the wall thickness t, and the same grease is used.

[Effect of idea]

As mentioned above, as a result of the test, the Kotoku of this invention,
Compared to conventional thick-walled plugs, the rotational torque for the number of times the handle is opened and closed is reduced, and the sealing performance is excellent.The flow resistance of the internal fluid is also low, making the plug easy to manufacture. It is possible to manufacture a kettle with high dimensional accuracy and provide a high quality kettle with stable stopper rotation torque and sealing performance.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing an embodiment of the present invention, Fig. 2 is a transverse sectional view of Fig. 1, Fig. 3 is a longitudinal sectional view showing an example of a conventional stopper, and Fig. 4 is a sectional view of Fig. 3. 5 and 6 are cross-sectional views showing other embodiments of the present invention. 1... Main body, 2... Plug, 3... Soft member, 11
...Flow port, 12...Opening, 22...Thick walled part,
31...Flow path, t...Wall thickness.

Claims (1)

[Scope of utility model registration request] The main body has communication ports on both sides, and has a tapered opening in the center with an upper part perpendicular to the communication ports widening to a large diameter, and has an outer circumferential surface that matches the openings, and has an outer peripheral surface that matches the openings. In a kettle in which a plug having a flow path corresponding to the main body is rotatably mounted and the fluid is opened and closed by rotating the plug by 90 degrees with respect to the main body, the plug is formed of a copper-based alloy, and The plug is characterized in that the sliding part of the plug has a wall thickness of about 2 to 4 mm, and a thick part is formed protruding from the inner surface of the plug near the flow path.