JPS624780Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a liquid level control valve.

Conventionally, in order to control the liquid level position of a water storage tank, tank, etc., a liquid level control valve is attached near the tip opening of a liquid supply pipe for supplying liquid to the water storage tank, tank, etc. A structure in which a float that utilizes buoyancy is housed in a cage-shaped valve box has been widely used, but since the float is directly affected by the flow of the liquid supply pipe, the accuracy of controlling the liquid level position has been reduced. It was also bad. Furthermore, many failures occur, such as when the float does not move up and down easily within the cage-type valve box, and repair work by disassembling the cage-type valve box to remove dust and the like is troublesome. In addition, since the float moves up and down, the cage-shaped valve box must be oriented vertically, which poses problems such as restrictions on the piping of the liquid supply pipe.

The present invention solves these conventional problems and is suitable for use as a liquid level control valve installed in water storage tanks, tanks, etc., which has high accuracy in liquid level control position, has few failures, is easy to repair, and is The purpose of this product is to make it possible to easily install it in the middle of a liquid supply pipe in a liquid storage container such as a water storage tank or tank with a common component structure that can be installed both vertically and horizontally. The features of the present invention include a butterfly-shaped valve body that is pivotably supported by a valve stem in a valve body through which fluid flows, and controls the flow rate; The mounting position can be changed freely,
a small gear detachably attached to the outer end of the valve stem; having teeth with a pitch diameter larger than the small gear; attached to the valve box so as to be able to be turned over; and a mounting position of the small gear; By changing the gear, the meshing range of the small gear with the teeth can be changed, and by turning it over,
a fan-shaped gear whose meshing range with the small gear of the teeth can be changed; a float that rises and falls with the liquid level;
It is composed of a swinging arm that interlocks and connects with the sector-shaped gear.

Hereinafter, the present invention will be explained in detail based on the illustrated embodiments.

In Figures 1 and 2, 1 is a short pipe, 2 is a valve box, and the short pipe 1 has flanges 3, 3 protruding from both end faces, and is connected between the pair of upper and lower short pipes 1, 1. The valve box 2 is held in the shape of a sandwich and fastened with bolt-nut connections 4, and a flow path 5 with a circular cross section through which the liquid flows is formed continuously by the short pipes 1, 1 and the valve box 2. For example, the case of vertical orientation will be exemplified. In a liquid storage container such as a water storage tank or a tank, these are attached to the middle or tip of a liquid supply pipe that supplies liquid into the container. Specifically, the flange portion 3 and a flange portion of the liquid supply pipe (not shown) are connected by bolts or the like.

The butterfly valve body 6 is pivotally supported by a valve rod 7 in the valve box 2 so as to be able to swing freely, and the valve seat 8 is made of an elastic member and the butterfly valve body 6 abuts against it as shown by the broken line in Fig. 1 to control the flow rate to zero, i.e., to stop the flow. The butterfly valve body 6 is fixed to the middle of the valve rod 7 by a fixing member 9, and the valve rod 7 is fixed to the middle of the valve rod 7 by a fixing member 9.
Both ends of the valve stem 7 are pivotally attached to the hole of the valve box 2 via bushings 10, 10 so as to be able to swing freely, one end is covered with a cover 11, and the other end projects outward from the valve box 2, and a small gear 13 is detachably attached to the protruding outer end 12 of the valve stem 7 by means of an attachment/detachment mechanism 14. Reference numeral 15 denotes a sector gear having a larger pitch circle diameter than the small gear 13 and always meshing with the small gear 13. Reference numeral 16 denotes a float which rises and falls with the liquid level 17, and the lower end of a float shaft 18 which passes vertically through the float 16, the right end of a swing arm 19 and a connector 2 are connected to the float shaft 18.
0, and the left end of the swing arm 19 is connected to a bolt 21
The float 16 and the sector gear 15 are ultimately linked together by a swing arm 19.

4 and 5 show detailed examples, and 22 is a flange provided on the valve body 2, through which the valve stem 7 is inserted and protrudes outward, and the flange 22 has a support plate. 2
3, and also attach the sector gear 1 to the support plate 23.
A support shaft 24, on which the swing arm 19 and the swing arm 19 are pivotally supported integrally, is fixed. Reference numeral 25 denotes a stopper board, which has a recessed notch 27 through which a stopper pin 26 protruding from the support plate 23 moves, and the swinging angle of the valve stem 7 is regulated by the stopper board 25 and the stopper pin 26. The valve body 6 is regulated to swing open and close within the range from the closed state of the valve body 6 as shown in FIG. 1 to the fully open state of FIG. 2. A key 28 is fixed to the valve stem 7 and fixes the position of the stopper board 25 with respect to the valve stem 7.

Therefore, the small gear 13 is arranged adjacent to the outside of the stopper board 25, and the fitting hole 2 of the small gear 13 is
9 is recessed with four key grooves 30, which are shared by making the key 28 longer and share the key grooves 30...
The small gear 13 is fitted into one of the valve stems 7 from the outer end surface of the valve stem 7 using a retaining ring 31 and a bolt 32 to prevent the small gear 13 from coming off. In this way, the above-mentioned attachment/detachment mechanism 14 is
It consists of a key 28 and a plurality of keyways 30. Further, the fan-shaped gear 15 is removably pivoted to the support shaft 24, and is prevented from coming off by a retaining ring 33 and a bolt 34, and the fan-shaped gear 15 has a front surface 35 and a back surface 36 of the same shape. As such, it can be turned inside out.

To explain these in more detail, the meshing range E of the small gear 13 and the meshing range G of the sector gear 15 shown by hatching in Fig. 6 are freely changeable.
Only the teeth 37...38... shown by thick lines mesh with each other and wear away, and the teeth 39...40... shown by thin lines
… is unused and remains up-to-date.
This is because it is sufficient for the valve body 6 to swing about 90 degrees. If the valve body 6 is used for a certain period of time in this state, the bolt 32 is removed and the valve stem 7 is pulled out, and another key groove 30 indicated by the symbol B is engaged with the key 28, and another meshing range E of the small gear 13 is reached as shown in the figure.
will mesh with the sector gear 15, and the teeth 37 in another meshing range E of about 90 degrees will wear away. If used for a certain period of time in this manner, the teeth 37 in a range of about 180 degrees including and will wear away. Therefore, as shown in the figure, the meshing range E is changed to fit another key groove 30 and key 28, as indicated by the symbol C. In addition, if the sector gear 15 is also turned over by removing the bolts 21 and 34 and the back surface 36 and front surface 35 are exchanged, the meshing range G will be changed.
In the first place, the unused tooth 40 becomes the meshing tooth 38, and the teeth 37, 38 in the meshing ranges E, G wear down. After a certain period of use, the key groove 30 and the key 2 indicated by the symbol D of the small gear 13 become worn down as shown in the figure.
By fitting the small gear 13 into the small gear 8, the small gear 13 is
The gear 13 and the sector gear 15 are used so that the teeth of the sector gear 15 are worn evenly.
The overall lifespan of the valve stem 7 can be extended by four times and twice, respectively. Although not shown, it is also preferable to form a spline shaft on the outer end 12 of the valve stem 7, make the hole of the small gear 13 a spline hole, and engage the two to form a spline connection, thereby forming the attachment/detachment mechanism 14. In this case, the angle can be changed to a smaller value, and the meshing range E can be changed little by little.

Next, as shown in FIG. 3, the flow path 5 is oriented horizontally,
It is also easy to attach it to the middle part or the opening at the tip of a liquid supply pipe in a liquid storage container such as a water storage tank or a tank, and the same reference numerals as in FIG.

The liquid level control valve according to the present invention can be used for any liquid, and the swing angle θ of the swing arm 19 has an upper limit horizontally and a lower limit diagonally downward, as shown in FIGS. 1 and 3. In addition to this, it is also possible to arrange the bisector of the swing angle θ horizontally, or to set the lower limit horizontally and the upper limit obliquely upward.

The present invention is constructed as described above, and only the small butterfly-shaped valve body 6 is contained in the valve box 2.
It is compact and easy to install, and can be installed in the most favorable position at the installation location, whether vertically as shown in FIG. 1 or horizontally as shown in FIG. Furthermore, the small gear 13 and the swinging arm 19
etc. are external and removable, making repairs easy.

In particular, since the sector gear 15 and the small gear 13 are meshed and the sector gear 15 has a pitch diameter larger than that of the small gear 13, the swing angle θ of the swing arm 19 connected to the sector gear 15 is amplified. For example, if the gear diameter ratio is 2:1, the swing angle θ is approximately 45
As a result, the difference in elevation of the float 16 can be significantly reduced. That is, even if the vertical amplitude of the liquid level 17 is small and the float 16 moves slightly up and down, the valve body 6 opens and closes at a large magnification, increasing or decreasing the amount of liquid supplied to the liquid container of the liquid supply pipe. Stopping could be controlled quickly and the accuracy of liquid level control could be improved. In addition, while sequentially changing the worn meshing range E of the small gear 13 with the sector gear 15,
If the worn meshing range G between the sector gear 15 and the small gear 13 is changed, the unused teeth of the small gear 13 and the sector gear 15 will mesh in sequence. That is, if the teeth of the attached small gear 13 and sector gear 15 become worn in their meshing ranges E and G, it is possible to change the meshing range and sequentially use the unused teeth. Therefore, if the teeth become worn and rattling occurs, a new meshing range can be formed by simply replacing the parts of the small gear 13 and sector gear 15 without replacing the entire parts. This makes it possible to extend the life of the small gear 13 and the fan-shaped gear 15, contributing to cost reduction. Furthermore, since the unused teeth can be changed to mesh sequentially, rattling between the teeth can be minimized over a long period of time, and the accuracy of liquid level control can be maintained at a good level.

[Brief explanation of the drawing]

Fig. 1 is a front view of one embodiment of the present invention, Fig. 2 is a sectional plan view of the valve in a fully open state, Fig. 3 is a front view of another embodiment, Fig. 4 is an enlarged front view of the main part, FIG. 5 is an enlarged cross-sectional plan view of the main part, and FIG. 6 is a simplified front view for explaining changes in the meshing range of the small gear. 2... Valve box, 6... Butterfly-shaped valve body, 7... Valve stem, 1
2...Outer end portion, 13...Small gear, 14...Detachable mechanism, 15...Sector gear, 16...Float, 17
...Liquid level, 19...Swinging arm, E...Matching range, G
...meshing range.

Claims (1)

[Claims for Utility Model Registration] A butterfly-shaped valve body 6 that is pivotably supported by a valve stem 7 in a valve body 2 through which fluid flows to control the flow rate, and a butterfly-shaped valve body 6 that controls the flow rate in the circumferential direction A small gear 13 is detachably attached to the outer end 12 of the valve stem 7 and the attachment position thereof can be changed along the valve stem 7; By changing the mounting position of the small gear 13, the meshing range E of the small gear 13 with the teeth can be changed, and by turning it over, A sector gear 15 whose meshing range G of the tooth portion with the small gear 13 can be changed; a float 16 that moves up and down with the liquid level 17; and a swinging arm 19 that interlocks and connects the sector gear 15. A liquid level control valve comprising: