JPH0680966U - Backflow prevention device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a backflow prevention device that can be manufactured simply and at low cost. [Composition] A communicating hole is provided at both ends, a female screw is formed on an inner wall of the hole, and a valve box having a valve chamber is provided at a central portion, and a pipe is provided at one of the communicating holes. A screw is attached to the other end, and a pipe is attached to the other end, and a disc having a magnetic force having a diameter larger than the inner diameter of the pipe and close to the diameter of the valve chamber is movably disposed in the valve chamber, and A packing formed of a magnet attracting member was provided in one of the pipes with a valve seat interposed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a backflow prevention device that controls a fluid on a pipe.

[0002]

[Prior art]

 Conventionally, there are two types of check valves: a lift type in which the valve body fluctuates vertically and receives back pressure to prevent back flow, and a swing type in which a valve body pivotally supported by a pin prevents back flow. A non-return valve has been devised that does not require a valve, and has a valve that automatically closes the water channel when the water supply pressure decreases.

[0003]

[Problems to be solved by the device]

 The check valve, which is equipped with a valve that automatically closes the water channel in response to a decrease in water supply pressure, has a valve mechanism that is composed of a spring or magnetic force.The former has a water inlet and a water outlet at both ends. It was provided by inserting a socket that doubles as a valve seat and water passage into the box, and was constructed by incorporating a spring-loaded valve element into the socket, which had the drawback of being expensive.

In the latter, a permanent magnet is provided in a complicated arrangement in a valve box and a water blocking rod, and the water blocking valve moves in the valve box by receiving the magnetic attraction and the demagnetizing force of the mutually interrelated magnets. It was a profound one that made the rod function as a valve, which was also expensive.

Further, a check valve in which the inflow side and the outflow side are formed of special members (see, for example, Japanese Utility Model Laid-Open No. 60-180875), and a fluid passage in which a portion corresponding to the valve box is specially complicatedly worked Although there is an automatic emergency shutoff device (see Japanese Patent Publication No. 62-40594), all of them have complicated configurations and are expensive, and the present invention eliminates the above-mentioned drawbacks and is simple, and It is to provide a backflow prevention device that can be manufactured at low cost.

[0006]

[Means for Solving the Problems]

 Therefore, in order to eliminate the above-mentioned drawbacks, the present invention provides a valve box in which communication holes are provided at both ends, female threads are formed on the inner walls of the holes, and a valve chamber is formed at the center. A pipe is screwed into one of the communication holes and a pipe is screwed into the other of the communication holes, and the valve chamber has a magnetic force larger than the inner diameter of the pipe and close to the diameter of the valve chamber. (EN) A backflow prevention device characterized in that a disc is placed so as to be free to move, and a packing formed of a magnet attracting member is provided in one of the pipes at a valve seat.

[0007]

【Example】

 An embodiment of the present invention will now be described with reference to the drawings, in which communication holes are provided at both ends, female screws (1) and (2) are formed on the inner walls of the holes, respectively, and a valve chamber (3 ) Is formed, and a valve box (4) having a contact nut shape is provided, and a pipe (5) is screwed to one of the communication holes, and a pipe (6) is screwed to the other, In the valve chamber (3), a disc (7) having a magnetic force larger than the inner diameter of the pipes (5) and (6) and having a diameter close to the diameter of the valve chamber (3) is movably placed. In addition, the backflow prevention device is characterized in that a packing (9) formed of a magnet attraction member is provided in one of the pipes (5) and (6) so as to be interposed in the valve seat (8).

The pipe (5) also includes a fitting such as a nipple, and a groove, fins or ribs are provided on the wall surface of the disc (7) or the inner wall of the valve box (4) to provide the disc (7 ) May maintain the posture in which the opening of the pipe (6) is not blocked.

[0009]

[Action]

 Next, the operation of the present invention will be described. The disk (7) movably installed in the valve chamber (3) is a pipe for positioning the packing (9) formed by the magnet attraction member by its own magnetic force. It adsorbs to the (5) side and closes its opening, thereby preventing backflow from the pipe (6) direction. Further, when a water supply pressure equal to or greater than the attraction force of the magnet is applied from the direction of the pipe (5), the disc (7) closing the opening is pushed open and does not hinder the passage of fluid.

Since the disc (7) pushed open in this case has a magnetic force, it exerts a magnetic force on the valve seat (8) which is a magnetic attraction member through the packing (9) while being pushed open, so that the disc is pushed. Even a small part of (7) tries to adsorb to the valve seat (8), and the disc (7) that loses balance due to this action and the jet pressure of fluid tries to maintain its tilted posture by the water flow pressure. Thus, an orifice is formed to allow the fluid to pass from the pipe (5) to the pipe (6), and the opening of the pipe (6) is not accidentally covered to prevent the flow of the fluid.

When the water supply pressure is reduced to less than the magnetic attraction force by the water supply stopping operation, the disk (7) is packed by the magnetic force to the valve seat (8) to close the opening of the pipe (5). It is adsorbed via 9) and prevents the reverse flow of fluid.

Regarding the action to maintain the inclined posture by the water pressure, in addition to the above-mentioned action, the groove, fin or rib formed on the wall surface of the disc (7) or the inner wall of the valve box (4) is used. Therefore, it is possible to maintain the posture in which the disc (7) does not block the opening of the pipe (6).

[0013]

[Effect of device]

 According to this invention, the structure is extremely simple, and it can be installed in any of vertical and horizontal directions. Moreover, the water channel can be automatically closed and crimped by a spring or the like. Compared with conventional valves with high resistance, it can act more sensitively to water flow with low water pressure, and it is not only lightweight and inexpensive to manufacture from ultra-compact to large-scale check valves, but it is also extremely easy to disassemble and It has extremely beneficial effects such as cleaning and replacement.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a horizontal cross-sectional view of the same plan view.

FIG. 3 is a central vertical cross-sectional view of the same plan view.

[Explanation of symbols]

 1 screw 2 screw 3 valve chamber 4 valve box 5 piping 6 piping 7 disk 8 valve seat 9 packing

Claims (1)

[Scope of utility model registration request] 1. A communication hole is provided at each of both ends, and female screws (1) and (2) are formed on inner walls of the hole, respectively, and
A valve box (4) having a valve chamber (3) is provided in the central part, and a pipe (5) is screwed to one of the communication holes and a pipe (6) is screwed to the other, In the valve chamber (3), a disc (7) having a magnetic force larger than the inner diameter of the pipes (5) and (6) and having a diameter close to the diameter of the valve chamber (3) is movably placed. A backflow prevention device, characterized in that a packing (9) formed of a magnet attracting member is provided in one of the pipes (5) and (6) so as to be interposed in the valve seat (8).