JPS60104879A - Control device of water level - Google Patents

Abstract

PURPOSE:To surely hold a valve to be sealed when it is fully closed, by equipping the first seal member adapted to the upper surface in a peripheral edge part of a bottom through hole and the second seal member opposed to the internal surface of an upper through hole when the valve is placed under its fully closed condition. CONSTITUTION:A valve body 30 fixes onto its external surface an annular flange 34 which has on its bottom surface a seal ring 32 adapted to the upper end surface of a bottom guide bush 28 under the fully closed condition of a valve. While the valve body 30 forms on its external surface, oppositely faced to the internal surface of an upper guide bush 27 under the fully closed condition of the valve, an annular recessed groove 36, and an O ring 37 is mounted to this recessed groove. Under the condition when the valve is half opened, the valve body produces small resistance for its sliding because the seal ring 32 is separated from the bottom guide bush 28 and also the O ring 37 is detached from the upper guide bush 27.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water level control device capable of controlling the water level in an aquarium without power.

Conventionally, there is a device of this type shown in FIG. 1. In the drawing, there is a water tank 1, and the water tank 1 is provided with a water supply pipe 2 with its tip extending into the tank. The extending end of the water supply pipe 72 is closed, and an upper through hole 3 and a lower through hole 4 are bored in the pipe wall of the extending end, which penetrate in the vertical direction.

A hollow cylindrical valve body 5 having a single outer diameter with open upper and lower walls is fitted into the through holes 3 and 4 so as to be movable up and down. At the bottom of the side wall of the valve body 5, there is an inverted V that expands downward.
Water flow lowers having letter-shaped notch surfaces 6 are formed at two locations in the circumferential direction, and the water supply pipes 2 of these water flow lowers control the amount of water flowing into the water tank l through the inside of the valve body 5. It is designed to allow

8 is a rod 70 floating on the water surface of the water tank 1, and the lower end of a rod 9 is connected to the 7 funnel 8.

The upper end of the rod 9 is swingably attached to a support beam 10 fixed to the upper part of the water tank 1, and is pivoted to one end of the rod 11.1. Further, the upper end of a hanging rod 12 whose lower end is connected to the upper end of the valve body 5 via a support rod 13 is pivotally supported at the other end of the lever 11 .

14 is a drain port provided in the water tank 1 facing the water supply pipe 2.

In the above, since the valve body 5 is in contact with the water supply pressure only on its outer surface, it receives no force in the axial direction due to the water supply pressure. Therefore, the relationship between the valve body 5 and the float 8 is such that the moment M1 in the counterclockwise direction around the fulcrum 0' is determined by the difference between the self-weight of the valve body 5 and the buoyant force acting on the valve body, and the moment M1 in the counterclockwise direction is exactly the difference between the self-weight of the float 8 and the buoyant force. The clockwise moment M2 around the fulcrum 10' 9 due to
Moreover, this relationship holds regardless of the level of the water supply pressure acting on the valve body 5. Therefore, the valve body 5 moves up and down due to the rise and fall of the float 8 caused by changes in the water level of the water tank 1. 11 to automatically control the water level in the water tank 1 by increasing or decreasing the opening degree of the water passage lower.

However, in the above-mentioned method, the inner surfaces of the through holes 3 and 4 that are in contact with the outer surface of the valve body, or the outer surface of the valve body that faces the through hole 3.4 in the fully closed state where the water flow lower does not communicate the water supply pipe 2 and the water tank 1, Since there is no sealing member in either structure, water leaks from the gap required for sliding between the outer surface of the valve body 5 and the inner surface of the through holes 3 and 4 of the water supply pipe 2 when it is fully opened, causing the water level in the water tank to drop. The disadvantage is that it is impossible to prevent abnormal increases.

The object of the present invention is to eliminate the drawbacks of the above-mentioned conventional devices and provide a device that can securely seal when fully closed and prevent an abnormal rise in water level.

In order to achieve the above object, the water level control device according to the present invention has a water level control device in which the valve body occupies the lower limit position and the water inlet contacts the upper surface of the peripheral edge of the lower through hole in a fully closed state where the water supply pipe and the water tank are not communicated. An annular flange having a contacting first seal member on the lower surface is fixed to the outer surface of the valve body, and a 27th ring member is disposed on the outer surface of the valve body facing the inner surface of the upper through hole in the fully closed state. That is.

The present invention will be described in detail below.

In this embodiment, the same parts as in the conventional one are given the same reference numerals to simplify the explanation, and mainly the different parts will be explained.

In FIGS. 2 and 3, 21 is a valve box having a flange 22 on one side and being open and the other side closed.
Extends into the water tank 1 and has a tip 75; a flange 23, and a key is provided to communicate both openings with the flange 23 of the water supply pipe 24. 25 and 26 are upper and lower through holes of the same diameter bored in the upper and lower walls of the valve box 21, respectively. A hollow cylindrical valve body 30 with an open wall is fitted so as to be movable up and down. The lower part of the side wall of the valve body 30 has a curved notch surface 31a that widens downward and a notch surface 31b that horizontally connects the lower edge of the notch surface 31a. ko3
1 are formed in pairs facing each other in the circumferential direction. As shown in the left half of FIG. 2, the water inlet 31 of the valve body 30 is
An annular flange 34 is fixed to the outer surface of the valve body 30. The annular flange 34 has a seal ring 32 on its lower surface that contacts the upper end surface of the lower guide bushing 28 in a fully open state in which the inside of the valve body 1 and the water 1 are not communicated with each other. A part of the inner peripheral side of the seal 1 nong 32 is fitted into a circumferential groove 33 formed on the outer surface of the valve body. The annular flange 34 has a side wall 35 that is bent downward from the tip of the earthen wall in parallel with the axial direction of the valve body. It is designed so that it will not be displaced. On the other hand, an annular groove 36 is formed on the outer surface of the valve body 30 that faces the inner surface of the upper guide bushing 27 in the fully open state, and this groove has an outer diameter larger than the outer diameter of the valve body by the amount of the tightening margin. Q IJ Song 7 is installed. The upper guide bushing 27 is made of a low-friction material with a self-lubricating function, such as lubricant-impregnated resin or metal, or metal whose inner surface is coated with Teflon. This makes it possible to reduce frictional resistance. In addition, 38.39 is above.
The groove 40.41 formed on the upper surface of the hole of the lower guide bushing 27.28 is a gasket that maintains watertightness between the upper and lower guide bushings 27.28 and the valve body 21.

In the above, the valve body 3o is connected to the float 8 via the connecting members 9-13.

Next, the action will be explained.

In the fully open state shown in the left half of FIG. 2, water from the water supply pipe 24 enters the valve box 21, passes through the water inlet 31, is introduced into the valve body 3o, and from here passes through the upper and lower openings of the valve body. 4'i
N l is supplied. At this time, the seal ring 32 is located near the lower end of the upper guide bush 27, and the OIJ song 7 is located in the water tank away from the upper guide bush 27. The water level in tank 1 gradually rises and float 8
As the water rises accordingly, the valve body 3o moves downward to gradually reduce the opening degree of the water inlet 31 to control the amount of water from the water supply 11♀24 introduced from the water inlet 31. When the fully closed state is reached, the seal ring 32 comes into contact with the upper end surface of the lower guide bush 28, and the O-ring 37 is drawn into the inner surface of the upper guide bush 27 through the groove 38 and comes into pressure contact therewith. (left half of Figure 2). In this case, when the flange 34 is nearly fully opened, the water supply pressure P is reached. Since the sealing ring 32 is greatly influenced by the sealing ring 32 and acts to press the sealing ring 32 downward, the sealing performance in the fully closed state is good.

As mentioned above, the water inlet 31 of the valve body 3o is normally in a half-open state, that is, the inside of the water supply pipe 2 and the valve body 3° is the water inlet 31.
In this state, the seal ring 32 is separated from the lower guide bush 28 and the O-ring 37 is also connected to the upper guide bush as the valve body 3o descends. Since the upper guide bushing 27 is separated from the upper guide bushing 27 until it is pulled into the inner surface of the bushing 27, the lifting and lowering of the valve body 30 is not hindered by the frictional resistance between the O-ring 37, seal ring 32, and both bushings 27, 28. During normal water level control, the valve body 30 moves up and down smoothly in response to changes in the water level of the water tank 1, and therefore the water level control accuracy is improved.

Note that the seal between the valve body 30 and the upper guide bushing 27 is not limited to the above-mentioned thick O-ring, but may also be an elastic packing 37' with a U half cross section as shown in FIG. 4, for example. It goes without saying that the design of other details can be changed in various ways.

This invention is as described above, and the valve body includes an annular flange having a first sealing member on the lower surface that comes into contact with the upper surface of the peripheral edge of the lower through hole when the water inlet of the valve body is fully open and does not communicate between the water supply pipe and the water tank. Since the second seal member is fixed to the outer surface of the valve body and is disposed at the outer corner j of the valve body that faces the inner surface of the upper through hole in the fully open state, the outer surface of the valve body and the inner surface of both of the through holes of the water supply pipe when fully opened Furthermore, since the first sealing member is pressed by the annular flange that receives high water supply pressure from the water supply pipe side, there is no water leakage phenomenon and an abnormal rise in the water level in the water tank can be prevented. It has an excellent effect.

[Brief explanation of the drawing]

Fig. 1 is a schematic front view of a conventional water level control device to which the present invention is applicable, and Fig. 2 is an enlarged longitudinal sectional front view of the valve section, with the right half showing the fully open state and the left half showing the fully closed state. FIG. 3 is a plan view of the valve body, and FIG. 4 is a partially enlarged longitudinal sectional front view showing another embodiment of the valve portion. 1...Water tank 8...Float 9.12...Rondo 10 mountain support beam 11...Lever 14 mountain drain port 21...Valve box 22, 23...Flange 24...
・Water supply pipe 25...Upper through hole 26・P lower through hole
27... Upper guide bush 28... Lower guide bush 3o... Valve body 31... Water inlet 32... Seal ring 33... Circumferential groove 34... Annular flange 35... Side wall 36...Annular groove 37...0 ring 3 figure 4 figure

Claims (1)

[Claims] 1. A water supply pipe is provided in a water tank having a drain port with its tip extending into the tank, and the extending tip is closed.
An upper through hole and a lower through hole are formed in the pipe wall at the extending end of the water supply pipe, and a hollow cylindrical valve body having upper and lower walls opened in both through holes is vertically movable. A water passage opening having a cutout surface that widens downward toward the bottom is provided in the lower part of the side wall of the valve body, and the valve body is floated on the water surface of the water tank via the connecting member, and the water level in the tank is lowered. In a water level control device connected to a float that moves up and down in response to changes, the valve body occupies the lower limit position and its water inlet hits the upper surface of the peripheral edge of the lower through hole in a fully closed state where the water supply pipe and the water tank are not communicated. An annular flange having a contacting first seal member on the lower surface is fixed to the outer surface of the valve body, and a second seal member is disposed on the outer surface of the valve body facing the inner surface of the upper through hole in the fully closed state. Characteristic water level control device.