JPH0280876A - Safety valve - Google Patents

Abstract

PURPOSE:To instantaneously interrupt inflow in the case of water failure on large quantity fluid side by combining a float having a guide shaft with a taper pipe, and forming the lower end of the guide shaft as a valve structure to integrally provide a valve device. CONSTITUTION:A float 2 forming a rotor meter with a taper pipe 3 stops at a fixed place according to the flow velocity of a large quantity of a fluid A, and corresponding to the operation, a needle valve 7 at the lower end of a guide shaft 1 opens a valve seat 5 of a small quantity of a fluid B to add a small quantity of a fluid B to a large quantity of a fluid A. At this time, in case of a decrease in water pressure of the large quantity of a fluid A or water failure, the floating float 2 descends together with the guide shaft 1, and with the operation, the needle valve 7 closes the valve seat 5 to instantaneously decrease or interrupt inflow of a small quantity of a fluid B. Thus, damage due to excessive inflow of a small quantity of fluid can be prevented completely.

Description

[Detailed description of the invention] [Industrial application field]

The present invention provides a valve for directly reducing or stopping the inflow of another small amount of inflow fluid in response to a reduction or stop of the inflow amount of the large amount of inflow fluid that should simultaneously flow into a large amount of inflow fluid. Regarding equipment. That is, it relates to a safety device suitable for use when adding a small amount of p) (adjusting agent aqueous solution or suspending agent) to a large amount of water, such as when adding an alkaline aqueous solution to adjust the pH of tap water.

[Conventional technology] BACKGROUND OF THE INVENTION Conventionally, area-type flow rate measuring devices using floats for measuring flow rate are known. This technique used a float inside a tapered tube and read the position of the float electromagnetically or optically. In addition, when adding a small amount of fluid to a large amount of fluid, for example, a large amount of water, for example, adding an aqueous alkaline solution to adjust the pH of tap water, or adding chemicals such as disinfectants and disinfectants to various types of water. It may be added in the form of a liquid or suspension. For example, a small amount of other fluid is added to the inflow of a large amount of fluid, such as the addition of an alkaline aqueous solution for adjustment, but in the unlikely event that tap water, which is a large amount of fluid, In the event of a drop in water pressure or a water outage, even if conventional flow measurement is performed, the inflow of alkaline aqueous solution, which is a small amount of fluid, will not necessarily be immediately shut off; There was a possibility of being exposed to unexpected dangers due to the inflow of alkaline or excessive amounts of disinfectants, disinfectants, etc. [Problems to be solved by the invention]

The present invention is applicable to technologies for adding a small amount of fluid to a large amount of fluid, such as adding an alkaline aqueous solution to adjust the pH of tap water, or adding a disinfectant in liquid form to a large amount of fluid, for example, to a large amount of water. Preventing unforeseen hazards by providing a device that directly and immediately cuts off or reduces the inflow of small quantities of liquid or suspended additives in the event of an unforeseen reduction in inflow or water interruption on the bulk fluid side. It is intended for that purpose.

[Means to solve the problem]

The present invention is a safety valve that is integrally provided with a float device having a guide shaft and a valve device having a valve structure at the lower end of the guide shaft. Here, the term "float device having a guide shaft" means a device which is composed of a float having a tapered tube and a guide shaft, and which moves up and down depending on the magnitude of the liquid flow rate and uniquely maintains a fixed position. Furthermore, a float having a guide shaft is a device made by fixing, adhering, fitting, loosely fitting, etc. a float to a guide shaft. The present invention will be explained below by way of example based on the drawings. In FIG. 1, an inflow channel pipe 41 and an outflow channel pipe 4-2 each include a tapered pipe 3 in which a float 2 having a guide shaft 1 is disposed, and 4-1 is an inflow channel pipe 4 for a large amount of fluid A.
-1-1 and a small amount of fluid B inflow channel pipe 4-], -
2. Inflow channel pipe 4-1-2 for a small amount of fluid B
has a valve seat 5 and a stopper 6. Here, guide shaft 1
The lower end of the valve is molded to form a needle valve 7, which together with the flow path pipe 4-1-2 for the small amount of fluid B, the valve seat 5, and the stopper 6 forms the valve. The float 2 floats in the fluid, and a shallow diagonal groove is carved in the lower part of the float 2 (the shaded area in the figure), and as the fluid passes, the float 2 and guide shaft 1 rotate together, causing the outer wall to taper. It maintains its position stably by forming a rotameter with the tube. Here, the float 2 floats upward due to the inflow of a large amount of fluid and stops at a fixed location depending on the flow velocity. Furthermore, optical
A scale or sensor 8 may be provided and read by electromagnetic or other known means to determine the flow rate. Note that the tapered tube 3 can be made of glass or transparent resin, and in that case, the position of the rotor can be known from the outside. The guide shaft used in the present invention may be attached to the inflow channel 4-4 as shown in FIGS. 2 and 3 as necessary.
It is preferable to stabilize the guide shaft by providing ribs 9-1 and 9-2 in the guide shaft 1 and a rib 9-3 in the outflow channel pipe 4-2 as shown in FIG. The large amount of fluid A that can be used in the present invention includes:
Examples include water and sewage water, lake water, and seawater. In addition, small amounts of fluid B include, for example, slaked lime aqueous solution or suspension as a neutralizing alkali for pH adjustment of waterworks, caustic soda aqueous solution, etc., and various other sterilizing and disinfecting solutions, such as chlorine dissolved in hypochlorous acid solution. Suitable for use in adding liquids, etc. Here, the ratio of the large amount of fluid A to the small amount of fluid B used is generally approximately 1:100 to 1:1,000,000. Note that the outflow channel pipe 4-2 is an outlet for a mixed fluid C consisting of a large amount of fluid and a small amount of fluid. Here, a small amount of fluid and a large amount of fluid may be separated from each other through the outlet 10 without being directly mixed on the pipe. Another example of the invention is shown in FIG. FIG. 5 shows an example of a safety valve using a sleeve valve structure instead of the needle valve structure shown in FIG. In FIG. 5, an inflow channel pipe 4-1 and an outflow channel pipe 4-2 are provided with a tapered pipe 3 in which a float 2 having a guide shaft 1 is disposed, and 4-1 is an inflow channel pipe 4 for a large amount of fluid A. -1-1 and a small amount of fluid B inflow channel pipe 4-1-2
It has. The inflow channel pipe 4-1-2 for a small amount of fluid B has a valve seat 5. Further, a stop valve 11 and a sluice valve 12 are provided at the lower part of the guide shaft l. The rotor 2 responds to the inflow of a large amount of fluid A and a small amount of fluid B.
has risen to a certain point. Now, when the inflow of fluid A decreases or stops, the guide shaft 1, float 2, stop valve, and flow valve are made as one unit, so the weight and hydraulic pressure will cause the guide shaft 1 to
falls, the stop valve is activated, and the inflow of fluid B is reduced or stopped. The float used in the safety valve of the present invention may be spherical, and does not necessarily need to rotate, and a magnet for position measurement may be installed in the float or guide shaft. Furthermore, even if the inflow of fluid stops or decreases, the gap between the tapered tube and the float does not necessarily have to be closed. It is also possible that the lower valve opens only when the flow rate exceeds the amount that results in a large volume of fluid. That is, the lower valve may not open until a large quantity of water flows into the lower valve. The safety valve of the present invention may be manufactured by using synthetic resin in part or in whole, or by surface treatment such as synthetic resin coating or lining on the metal base in order to prevent scale adhesion. Can be done. It goes without saying that various other modifications and uses can be made within the scope of the idea of the present invention.

[Operation] By using the safety valve configured as described above, it is possible to prevent the addition of a small amount of other fluid to the inflow of a large amount of fluid, such as the addition of an alkaline aqueous solution to adjust the pH of tap water. However, in the event that the water pressure of tap water, which is a large amount of fluid, decreases or there is a water outage, the float, which had been floating until then, will descend together with the guide shaft.
At the same time, in the valve structure at the lower end of the guide shaft, that is, the needle valve structure shown in FIG.
2. The valve comprising the valve seat 5 and stopper 6 operates, and the stop valve and sluice valve shown in Fig. 5 also operate, and the inflow of other small amounts of fluid is immediately reduced or blocked. becomes. In the present invention, various types of valves other than these can be used, such as a stop valve and others.

【Example】

pH 6, as a large volume of fluid using the apparatus shown in Figure 1.
Using 10 m3/hr of tap water at pH 11.8 and a small amount of other fluid, a slaked lime aqueous solution at pH 11.8 at 2.0°C/hr.
An inflow of hr was used. Here, when the inflow of tap water was shut off, the inflow of the slaked lime aqueous solution was also blocked at once due to the blocking effect of the valve, and no sudden increase in the pH of the tap water was observed. On the other hand, in a test that did not use the safety valve of the present invention, when the inflow of tap water was shut off and the inflow of the slaked lime aqueous solution was stopped knowing the change in flow velocity due to the change in the float position, the pH of the tap water was temporarily 10. It rose to .5.

【Effect of the invention】

Since the present invention is configured as described above, it has the effects described below. The safety valve of the present invention is designed to prevent the inflow of a large amount of fluid from occurring when a small amount of another fluid is added to the inflow of a large amount of fluid, and if the pressure of the large amount of fluid drops or the inflow stops. Since the inflow of other small amounts of fluid is automatically and immediately reduced or blocked, damage caused by excessive inflow of other small amounts of fluid can be completely prevented. In order to adjust the addition of small amounts of other fluids, it is possible to prevent disadvantages due to malfunctions that may occur even when measuring the flow velocity of a large amount of fluid flowing in by optical or electromagnetic methods. Yes, the benefits of the present invention are significant. If the present invention is applied to a process for adjusting the pH of tap water, even if there is an abnormality in the inflow of tap water and the monitoring is neglected, the inflow of alkaline aqueous solution will be automatically reduced or blocked. As a result, this process can be carried out with peace of mind, without being exposed to unexpected sanitary dangers due to extreme increases in pH. In addition, it has a wide range of applications including disinfection and sterilization of river water, lake water, seawater, etc.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the safety valve device of the present invention, Fig. 2 is a section showing the installation of the rib 9-1 in the device shown in Fig. 1, and Fig. 3 is a section showing the installation of the rib 9-2 in the device shown in Fig. 1. Figure 4 shows a cross-sectional view of the attachment part of the rib 9-3 in the device shown in Figure 1. Fifth
The figure is a sectional view of another example of the present invention. 1 Guide shaft, 2: Float, 3: Tapered tube 4-1:
Inflow flow path pipe, 4-1-1: Inflow flow path pipe for a large amount of fluid A;
4-1-2: Inflow channel pipe for a small amount of fluid B, 4-2: Outflow channel pipe, 5. Valve seat, 6: Stopper 7: Needle valve, 8: Scale or sensor 9-1: Rib, 9 -2: Rib, 9-3
: Rib 10: Separation outlet for small amount of fluid B, 11 nist stop valve, 12: sluice valve, A: large amount of fluid, B: small amount of fluid, C: mixed fluid of fluids A and B. Applicant Manufactured by Kureha Co., Ltd. Agent Patent attorney Shibuya Draft procedure amendment (method) % formula % Display of the case 1986 Patent Application No. 231474 Person who amends the name of the invention Safety relationship with the case valve

Claims (1)

[Claims] 1. A safety valve, which is a combination of a float having a guide shaft and a tapered pipe, and is integrally provided with a valve device with the lower end of the guide shaft serving as a valve structure.