JPS6323464Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a water lock installed in a culvert drainage channel or the like.

This type of water lock is generally known to be equipped with a seal stopper that is placed in close contact with and spaced apart from a seat formed on a tube body to open and close an internal passage of the tube body, and improves the ability to completely close the internal passage. Various measures have been taken to improve the operability during opening and closing and the durability of the seal.

For example, there is a closure that is made of a solid cannonball-shaped elastic body and has many fin-like protrusions formed in the vertical direction on its outer surface. is easily elastically deformed when pressed against the seat surface, and is securely in close contact with the seat surface, so that the fully closing function of the internal passage is well maintained.
However, on the other hand, the fin-like protrusions are easily damaged by repeated opening and closing operations of the seal, which poses a problem in the durability of the seal. That is, the elastic restoring force of the fin-like protrusions is quickly weakened or missing, which causes a decrease in the durability of the seal and a decrease in the full closing function. Furthermore, the fin-like protrusions may rub strongly against the U-shaped seat surface, reducing operability.

The present invention was developed in view of the above circumstances, and consists of a sealing plug made of a hollow foam-like elastic body filled with fluid, and an operating shaft that presses the sealing plug to pressurize the fluid inside. It is an object of the present invention to provide a water lock that can improve the ability to completely close the internal passage of a pipe without impairing the operability during opening and closing or the durability of the seal.

Hereinafter, the water lock according to the present invention will be explained according to the illustrated embodiment.

The water lock A illustrated in FIG. 1 has a vertical riser pipe 2 connected to a joint-shaped pipe body 1 buried underground, and a seal plug 4 attached to the lower end of an operating shaft 3 inserted through the riser pipe 2. In addition, a handle 5 for operation is provided at the upper end of the operating shaft 3, and the upper end opening of the riser tube 2 is closed with a lid 6.
A cap 7 is placed over the top.

In this water lock A, a U-shaped seating surface 11 shown in FIG. It is configured to be closely spaced from the seat surface 11, and an internal passage 12 (see FIG. 1) of the tubular body 1 can be opened and closed.

Next, as is clear from FIG. 3, the above-mentioned seal plug 4 is constituted by a hollow bullet-shaped elastic body made of rubber or the like, and a liquid L such as water or oil is sealed inside thereof. In the illustrated example, the seal plug 4 includes a bellows-shaped hollow protrusion 42 integrally formed on the upper part of a cannonball-shaped plug main body 41, and a flange 42a formed on the protrusion 42.
is a holder 3 provided at the lower end of the operating shaft 3 described above.
1 is fitted and held. In addition, the protruding portion 42
A protection tube 8 is fitted onto the outside, and a lower end flange 81 of the protection tube 8 is screwed to a mounting plate 82 embedded in the plug body 41, and an upper guide portion 83 of the protection tube 8 slides onto the operating shaft 3. It is attached to the outside so that it can move freely.

In the above, as shown in FIG. 3, the seal plug 4 is moved downward by operating the handle 5 until the lower end surface of the plug body 41 of the seal plug 4 comes into contact with the lower end 11a of the seat surface 11, and then the handle 5 is further operated. When the operating shaft 3 is pushed down by the pusher, the protrusion 42 of the seal plug 4 held in the holder 31 is contracted by the pressing force, and the liquid L inside the seal plug 4 is pressurized accordingly. The stopper main body 41 bulges laterally and downwardly as shown by the imaginary line in the figure. Therefore, as shown in Fig. 2, the seal plug 4 is attached to the U-shaped seat surface 1.
1 to ensure that the internal passage 12 of the tube body 1 is closed. In this case, if the protrusion 42 has a smaller diameter than the stopper main body 41 as in the illustrated example, a large pressing force of the stopper main body 41 against the seat surface 11 can be exerted with a small pressing force against the operating shaft 3. From this state, when the pressing force by the operating shaft 3 is released by operating the handle 5, the liquid L inside the seal plug 4
Since the pressurized state is released, the stopper body 41 returns to its original state as shown by the solid line in FIG. 3 due to its own elastic restoring force, and separates from the seat surface 11 (see FIG. 2). Alternatively, the protrusion 42 may only lightly contact the seat surface 11 (see FIG. 2), and the protrusion 42 may extend upward due to its own elasticity and connect the operating shaft 3 via the holder 31. Push it up to its original position. When the operating shaft 3 is lifted by operating the handle 5, the seal plug 4 is also smoothly separated from the seat surface 11 (see FIG. 2), and the internal passage 12 of the tubular body 1 is opened.

The seal plug 4 explained in FIGS. 1 to 3 is attached to the operating shaft 3.
It may be made of an elastic body that contracts to the extent that it completely separates from the seat surface 11 due to its elastic restoring force as the pressing force is released, but it should not have that much elastic restoring force. It may also be made of an elastic body. In either case, when the liquid L inside the sealing stopper 4 is pressurized by the pressing force of the operating shaft 3, the stopper body 41 is backed up by the liquid pressure.
is firmly attached to the seat surface 11. However, the former is more preferable than the latter in terms of easy operation of the handle 5 and improvement in the durability of the seal plug 4. That is,
In the former case, the stopper body 41 does not rub against the seat surface 11 at all when the stopper 4 is moved up and down, whereas in the latter case, the stopper body 41 lightly rubs against the seat surface 11 when the stopper 4 is moved up and down. be. Note that for water locks used in cold regions, it is desirable to use antifreeze as the liquid L. It goes without saying that air may be filled in instead of the liquid L, but in order to increase the pressing force of the seal plug 4 against the seat surface 11, it is preferable to fill in air instead of the liquid L. It is more advantageous to use

Further, in the water lock A equipped with the seal plug 4 described in FIGS. 1 to 3, it is possible to increase or decrease the pressing force of the seal plug 4 against the seat surface 11. That is, the pressing force can be adjusted by increasing or decreasing the amount (H) by which the operating shaft 3 is pressed down when the internal passage 12 of the tubular body 1 is fully closed (see FIG. 3). In this case, as shown in Fig. 4, for example, the operating shaft 3
A plurality of locking grooves 91 are formed in the upper end portion in several stages up and down, and these locking grooves 91 are connected by a vertical groove 92, and a claw piece 93 is provided protruding from the lid body 6, and the claw piece It is convenient if the locking groove 93 can be locked in any one of the locking grooves 91. That is, in this case, when the claw piece 93 is locked in the upper locking groove 91, the pressing force increases more than when the claw piece 93 is locked in the lower locking groove 91. When changing the locking groove 91 in which the claw piece 93 is to be locked, operate the handle 5 to rotate the operating shaft 3 by a predetermined angle so that the vertical groove 92 corresponds to the claw piece 93. is moved up and down so that the desired locking groove 91 faces the claw piece 93, and finally the operation shaft 3 is rotated in the opposite direction by a predetermined angle. Note that when such a pressing force adjustment mechanism 9 is adopted, the operation shaft 3 is adjusted as shown in FIG.
If a scale (M) is displayed on the screen, usability will be further improved.

As is clear from the above explanation, the water lock according to the present invention increases the pressure of the fluid sealed in the seal to obtain the pressing force of the seal against the seat surface, so the pressing force becomes strong and the pipe body The sealing function of the internal passage can be maintained reliably at all times. Also,
When opening and closing the internal passage, the pressurized state of the fluid sealed in the seal plug is released, so the seal can be smoothly moved toward and away from the seat surface, improving operability and durability of the seal. Improved together. Furthermore, since the seal plug is shaped like a cannonball, it is advantageous in that there is no directionality when opening and closing.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a water lock according to an embodiment of the present invention.
Figure 2 is a cross-sectional view taken along the line E-A in Figure 1, Figure 3 is an enlarged longitudinal cross-sectional view of the main part of the lock in Figure 1, and Figure 4
The figure is an enlarged vertical cross-sectional view of a part of the water lock shown in FIG. 1. 1...Pipe body, 3...Operation shaft, 4...Tight plug, 41
...Bung body.

Claims (1)

[Scope of utility model registration request] In a water lock equipped with a seal that is closely spaced from a seat formed in a tube body to open and close an internal passage of the tube, the seal is made of a hollow bullet-shaped elastic body filled with fluid, and the seal is pressed. A water lock characterized by being equipped with an operating shaft that pressurizes the fluid inside.