JPS6144055Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a float valve, and more specifically, the float valve is installed at a downward liquid supply port by vertical movement of a float that follows fluctuations in the liquid level of a liquid tank in which the float is floating. This invention relates to a float valve that shuts off and circulates liquid by pressing and separating a valve body vertically from below onto a valve seat.

Some float valves have a valve body mounted directly above the float so that the valve body presses against and separates from the valve seat as the float moves up and down. Since the pressing force is weak, a float is attached to the support rod as shown in Figure 1a, and a lever is used to press the valve body against the valve seat with a pressure many times greater than the lifting force of the float. There are many. In Fig. 1, 1 is a liquid supply port, 2 is a valve seat, 3 is a valve body, 3a is a valve stem, 4 is a support rod, 4a is a pivot shaft of the support rod, 5 is a float, 6 is a liquid tank, 7 is the drain port.

However, in a float valve as shown in Fig. 1a, in order to obtain a sufficiently large pressure force between the valve body and the valve seat, the support rod must be made long.
Furthermore, since the stroke of the valve body becomes small, there is a drawback that the resistance when opening the valve is large and the flow rate is small.

Furthermore, if such a float valve with a support rod cannot fully fit into the liquid tank as shown in FIG. 1b, the only option is to cut the support rod 4 to make it shorter. This results in a reduction in the pressure resistance of the valve. Further, when adjusting the water stop level as shown in FIG. 1c, there is a problem in that the support rod 4 must be forcibly bent.

The purpose of this invention is to eliminate the drawbacks of the prior art, and to increase the pressure resistance of the valve despite the short length of the float rod, and to reduce the flow rate of liquid when the valve is opened due to the large stroke of the valve body. It is an object of the present invention to provide a float valve which is large in size, whose branch rod can be oriented in any direction, and whose working liquid level can be easily adjusted.

The float valve according to the present invention presses and separates the valve body vertically from below onto the valve seat provided at the downward liquid supply port by vertical movement of the float that follows fluctuations in the liquid level of the liquid tank in which the float floats. In a float valve that shuts off and circulates liquid, the first pivot shaft can be set horizontally, and its direction can be selected, either below the line of movement of the valve body or below the line on the opposite side of the float. The base of a first support rod, which is fixedly installed and has a float fixed to its tip, is pivotally connected to the first pivot shaft, and the first support rod is composed of two members that are fixed by bolting to each other in a vertical plane. , a second pivot shaft is provided on the member pivotally connected to the first pivot shaft in parallel with the first pivot shaft, and the member is moved up and down along a vertical guide groove provided in a movement line of the valve body. The float valve is characterized in that a base of a second support rod having an arcuate tip for moving the valve body up and down is pivotally connected to the second pivot shaft.

In a preferred embodiment of the float valve of the present invention, the vertical surface where the two members of the first support rod are bolted to each other has a number of radially extending ridges centered on the bolt hole, and the ridges can fit together at any joining angle of the two members so that the second member can be fixed by bolting.

Hereinafter, the float valve according to the present invention will be described in detail based on the drawings of embodiments. Figures 2a, b and c are respectively a plan view, a side view and a longitudinal sectional view of an embodiment of the float valve of the present invention. In FIG. 2, the same reference numerals as in FIG. 1 indicate the same parts and parts.
This float valve also utilizes this principle in the same way as the float valve shown in FIG. That is, by vertically moving the float 5 attached to the first support rod 10, the valve body 3 is pressed against the valve seat 2 provided in the downward liquid supply port 1 from vertically downward and separated, thereby blocking and distributing the liquid. conduct.

In this float valve, a valve body guide plate 11 having a liquid passage hole is fitted to one end of the liquid supply port.
A male thread is formed on the outer end, and a retaining nut 13 is screwed onto the male thread to fix the valve body guide plate 11. A support 12 extending downward is biased against the valve body guide plate 11. The support 12 is provided with a vertical guide groove 12a in a region where the end of the valve stem 3a of the valve body 3 moves, and further on the line of movement of the valve stem 3a below the guide groove 12a or opposite to the float 5 from the line. biased to the side (the former in the embodiment), the first pivot shaft 14
is provided. Since the valve body guide plate 11 can be rotated about the valve stem 3a by loosening the retaining nut 13, the direction of the first pivot shaft 14 can be appropriately selected and fixed. A first support rod 10 having a float 5 fixed to its tip consists of two members 10a and 10b joined by bolts 18 in a vertical plane.

The vertical surfaces of the two members 10a and 10b to which the bolts are joined are provided with a large number of radial uneven stripes centered on the bolt holes. When the vertical surfaces of the two members 10a and 10b are pressed together with the bolt holes aligned, the uneven stripes fit together regardless of the joining angle, and the two members 1
0a and 10b are fixed by bolt connection. In this way, since the joining angle of the members 10a and 10b can be appropriately selected, the working liquid level can be easily adjusted.

The base of the first support rod 10, that is, the end of the member 10a to which the float 5 of the first support rod 10 is not fixed, opposite to the bolt 18 connection, is pivoted to the first pivot shaft 14. As mentioned above, since the direction of the first pivot shaft 14 can be selected as appropriate, the first support rod 10 can be oriented in any direction depending on the situation of the liquid tank and the like. The member 10a is widened upward near the first pivot shaft 14 and has a protruding portion 10c on the upper side. Projection part 10c
, a second pivot shaft 15 is provided parallel to the first pivot shaft 14. The protrusion 10c does not necessarily have to be provided, and the second pivot shaft 15 is connected to the first
It may be provided at a location separated from the pivot shaft 14 by an appropriate distance. This appropriate gap is determined from the required closing pressure and stroke length of the valve.

A base portion of a second support rod 16 having an arcuate tip portion 17 is pivotally attached to the second pivot shaft 15 . Second
The tip end 17 of the support rod 16 is guided by the guide groove 12a.

When the liquid level on which the float 5 floats changes, the float 5 moves up and down, and the first support rod 10 moves toward the first pivot shaft 1.
4, and therefore the second pivot shaft 15
also swings about the first pivot shaft 14. The second support rod 16 moves together with the second pivot shaft 15, but its tip 17 is guided by the guide groove 12a, and movement in the left and right direction is suppressed, and only vertical movement is allowed. moves up and down, and the valve stem 3a of the valve body 3
is moved up and down, and the valve body 3 is pressed against and separated from the valve seat to cut off and circulate the liquid.

The operating mechanism of the valve body of the float valve of the present invention is characterized by the high pressure resistance of the valve, and the stroke of the valve body is relatively large compared to the stroke of the float, which reduces the flow rate of liquid when the valve is opened. This is something that can be made a big deal. In conventional lever-type float valves, in order to increase the valve's pressure resistance, it is necessary to lengthen the float's support rod or shorten the distance between the fulcrum and the valve actuation point. This causes various inconveniences. In addition, if the withstand pressure of the valve is increased using a lever type using either method, the stroke of the valve body becomes small, and when the valve is opened, there is a drawback that the flow rate decreases.

In the float valve of the present invention, the first pivot shaft 1
4 (the pivot shaft 14 is rotatable on the support 12, and the member 1
It is assumed that 0a is fixed to the pivot shaft 14. )
The rotational moment M ₁ of the float acting on the float is equal to the product of the buoyant force W of the float 5 and the distance L ₁ between the pivot shaft 14 and the center of the float 5 .

M ₁ = WL ₁ On the other hand, the force F that separates the valve body 3 from the valve seat 2 is transmitted to the tip 17 of the second support rod, the second support rod 16, and the second pivot shaft 15, and is further transmitted to the member 10a and the second pivot shaft 15. 1 pivot shaft 1
4 is transmitted. Now, the rotational moment M ₂ acting on the first pivot shaft 14 is expressed as the product of the force transmitted to the shaft and the distance L ₂ between the pivot shafts 14 and 15; Force moves valve body 3 to valve seat 2
A fraction or a fraction of 10 of the force F that causes more separation
Since _{it is only the component} force _of do not have. According to the numerical values used in the actual device, a sufficiently high valve closing pressure can be maintained at L ₂ /L ₁ =1/6 to 7.

Furthermore, since L ₂ /L ₁ is relatively large, the stroke of the second pivot shaft is also relatively large. In the float valve of the present invention, the stroke of the second pivot shaft is converted into a vertical stroke guided by a vertical guide groove at the tip of the second support rod whose base is pivoted to the second pivot shaft. If the position of the first pivot shaft is on the movement line of the valve body, the angle between the line connecting the first pivot shaft and the second pivot shaft and the horizontal plane should not exceed approximately 60 degrees. The length of the vertical movement stroke of the tips of the two support rods can be made larger than the stroke length of the second pivot shaft. In addition, if the first pivot shaft is located on the opposite side of the float from the movement line of the valve body, the line connecting the first pivot axis and the second pivot axis will be the line of movement of the valve body. The first pivot shaft and the second
The line connecting the pivot axes may be inclined to the horizontal plane.

Therefore, in the float valve of the present invention, the stroke of the valve body is large, and the flow rate is large when the valve is opened.

As described above, the float valve of the present invention can produce excellent effects. The summary is as follows.

(1) The valve has a high pressure resistance.

(2) The stroke of the valve body is large and the flow rate of liquid when the valve is opened is large.

(3) Depending on the shape of the liquid tank, the installation position of the liquid supply port, etc.
The float rod can be oriented in any direction.

(4) The height of the float can be easily changed and the working liquid level can be easily adjusted.

[Brief explanation of drawings]

Figures 1 a, b and c are side views of an example of a conventional float valve, a plan view and a side view showing how it is installed in a liquid tank, and Figures 2 a, b and c are examples of the float valve of the present invention. FIG. 2 is a plan view, a side view, and a longitudinal sectional view of 1...Liquid supply port, 2...Valve seat, 3...Valve body, 3a
...Valve stem, 4...branch, 4a...pivot shaft, 5...
Float, 6...Liquid tank, 7...Drain port, 10...
1st branch, 11...valve body guide plate, 12... branch,
12a...Guide groove, 13...Press nut, 14...
...first pivot shaft, 15...second pivot shaft, 16...second support rod, 17...tip, 18...bolt.

Claims (1)

[Scope of Claim for Utility Model Registration] (a) Due to the vertical movement of the float, which follows fluctuations in the liquid level in the liquid tank in which the float is floating, the vertical movement of the valve body into the valve seat provided at the downward liquid supply port. In a float valve that shuts off and circulates liquid by crimping and separating from below, the first pivot shaft is horizontally positioned below the movement line of the valve body, or biased downward from the line to the opposite side of the float. The base of a first support rod, which is fixed in a selectable direction and has a float fixed to its tip, is pivotally connected to the first pivot shaft, and the first support rods are fixed to each other by bolting in a vertical plane. The member is pivoted to the first pivot shaft, and a second pivot shaft is provided in parallel to the first pivot shaft, and the guide groove is perpendicular to the movement line of the valve body. 1. A float valve characterized in that a base of a second support rod having an arc-shaped tip that moves up and down along the valve body is pivoted to the second pivot shaft. (b) The vertical surfaces of the two members of the first support rod that are bolted to each other have a large number of radial uneven stripes centered on the bolt hole, and the uneven stripes are formed at any joining angle of the two members. The float valve according to claim 1, which is a registered utility model, is configured such that the two members fit into each other and can be fixed by bolting the two members together.