JPH0614642U - Air valve - Google Patents

Abstract

(57) [Summary] [Purpose] Even if the fluid in the fluid piping blows up into the valve box, it is difficult for the fluid to splash from the air chamber to the upper part. Even if the float bounces upward due to the blowing of fluid, the float is dropped to a predetermined position in a stable posture. To prevent sludge and dust contained in the fluid from adhering to or trapping in the valve chamber, ensure the sealing performance, and maintain good operation as an air valve. [Structure] At the lower end of the air chamber 7, upper and lower conical plates 23, 2 are provided.
Attach the splash stopper 21 formed by closing the outer periphery of 4.
Small holes 23a and 24a of the conical plates 23 and 24 and the intermediate space 2
Air is circulated in the float chamber 4 and the air chamber 7 by a labyrinth-shaped air passage 26 composed of A conical splash stopper 22 is attached to the wire rope 15 below the splash stopper 21, and when the float 9 rises, the distance from the conical plate 24 of the splash stopper 21 is reduced to allow more fluid to enter the air passage 26. Make it harder.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fluid pipe for transferring a fluid, particularly an air valve provided in a fluid pipe for transferring a fluid containing a foreign substance such as sewage, sludge or agricultural water and used for discharging and sucking air in the fluid pipe. .

[0002]

[Prior art]

 In order to discharge the air in the fluid piping or the gas generated from the fluid to the fluid piping that transfers fluid such as sewage, or to introduce the air into the fluid piping to smoothly discharge the fluid in the piping. For example, an air valve as shown in JP-A-2-125183 is attached.

In this air valve, an air chamber having a diameter smaller than that of the large-diameter body portion of the float chamber is formed between the float chamber in the lower portion of the valve box and the valve chamber in the upper portion of the valve box. By compressing this air in a small-diameter air chamber, the pressure inside the valve box is increased to maintain equilibrium with the pressure of the fluid overflowing into the float chamber, preventing the fluid from rising to the valve chamber and vent holes. I am trying to prevent it.

[0004]

[Problems to be solved by the device]

 However, when the fluid piping is filled with water or when the fluid in the fluid piping pulsates due to pressure fluctuations, etc., the fluid blows up into the valve box and is contained in the fluid between the valve body and the valve seat. There is a risk that foreign matter such as earth and sand will be caught or the sealing material will be damaged, impairing the sealing performance between the valve body and valve seat, and sewage will overflow to the outside of the air valve through the ventilation hole, polluting the surrounding area and giving off an odor. May be released.

Similarly, when the fluid is blown up, the float may jump upward and collide with the upper wall to be damaged or may not fall into a proper position properly, so that the function as a float can be sufficiently exerted. Sometimes there is not.

Therefore, an object of the present invention is to provide an air valve in which the behavior of the float due to the blowing of the fluid is suppressed as small as possible to eliminate the above-mentioned problems.

[0007]

[Means for Solving the Problems]

 According to the present invention, according to the above-mentioned object, a float chamber is provided under a valve box connected to a fluid pipe, and a float accommodated in the float chamber rises from the fluid pipe to the float chamber. The valve element provided in the valve chamber above the valve box is moved upwards by closing the vent hole connected to the upper portion of the valve chamber with the valve element, and An air valve having an air chamber having a smaller diameter than the float chamber and blocking the discharge of air from the air chamber, the float, the float, and the valve body. It is characterized in that a rope for connecting the above is provided with a splash stop for preventing the fluid from being blown up from the float chamber to the air chamber.

[0008]

[Action]

 According to this structure, the spray stopper narrows the space between the air chambers, ensures the flow of air, and makes it difficult for the fluid to move upward from the air chambers. Splash stops on floats or ropes are usually in the lower part, and when the fluid is blown up, they move upward while preventing the fluid from being blown up.

Further, when the splash stoppers are provided in both the air chamber and the float or rope, the splash stoppers are usually separated from each other, and if the float is lifted by blowing up the fluid, the float or The rope-side splash stopper approaches the air chamber-side splash stopper and closes the gap, making it difficult for the fluid to flow upward from the air chamber.

[0010]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

The air valve 1 is attached by connecting a flange 2 a provided at a lower end of the valve box 2 to an upper surface of a fluid pipe such as a sewer pipe (not shown), and an air communication hole provided at an upper end of the valve box 2. The air in the fluid pipe is exhausted or sucked from the outside through the No. 3. A float chamber 4 communicating with the fluid pipe is provided in the lower part of the valve box 2, and a valve chamber 5 and a float valve chamber 6 communicating with the atmosphere communication hole 3 are provided in the upper part of the float chamber 4, and further connected to the float chamber 4. An air chamber 7 having a small diameter is provided between the valve chamber 5 and the valve chamber 5.

The valve box 2 is divided into an appropriate number of parts so that the internal assembling work can be easily performed. The upper part of the float chamber 4 is a large-diameter body portion 4a, and in the small-diameter air chamber 7, a large amount of air in the large-diameter body portion 4a is compressed to increase the pressure in the valve box 2 and The pressure of the fluid overflowing from the pipe to the float chamber 4 is maintained in equilibrium to prevent the fluid from rising to the upper part of the valve box 2.

A plurality of guide ribs 8 are vertically provided in the float chamber 4 from the lower side of the air chamber 7, and a capsule-shaped float 9 accommodated in these guide ribs 8 is moved up and down as the fluid level rises and falls. The float chamber 4 can be smoothly moved up and down.

In the valve chamber 5, a valve body 11 is arranged in a cylindrical guide 10, and the valve body 11 includes a coil spring 12 that is contracted between the valve body 11 and a bottom wall 10 a of the cylindrical guide 10. It is urged toward the valve seat 13 provided at the upper part of the valve chamber 5 by elastic force. The valve element 11 is composed of a lower valve 16 connected to the float 9 via a link mechanism 14 and a wire rope 15, and an upper valve 17 which sits on the valve seat 13 and closes the large-diameter vent hole 13a when moving upward. It is divided so that each can move up and down individually in the cylindrical guide 10.

The link mechanism 14 balances the weight of the float 9 and the urging force of the coil spring 12 and presses the valve body 11 upward by the strong urging force of the coil spring 12, thereby causing the atmosphere communication hole 13a and the later-described communication hole 13a to be described. In addition to reliably blocking the small-diameter vent hole 28, the vertical stroke of the valve body 11 interlocking with the float 9 is also made smaller than the float 9 by a plurality of links. Further, the wire rope 15 has flexibility, and when the liquid level in the valve box 2 rises and the valve body 11 blocks the atmosphere communication hole 13a, the vertical movement of the float 9 is directly applied to the valve body 11. It acts as a buffer that does not transmit.

In the float valve chamber 6, a short cylindrical cone-shaped float valve body 19 is housed in the cylindrical guide 18, and when the liquid level of the fluid in the float chamber 4 rises to the float valve chamber 6. The float valve body 19 floats on the liquid surface and is seated on the valve seat 20 in the upper part of the float valve chamber, closing the atmosphere communication hole 3 and cutting off the communication between the inside of the valve box 2 and the outside.

A splash stopper 21 is fixedly installed at the lower end of the air chamber 7, and the wire rope 15 is also provided with a splash stopper 22 below the splash stopper 21. The splash stopper 21 on the side of the air chamber 7 is formed by closing the outer peripheries of the upper and lower conical plates 23, 24, and has a labyrinth-like shape composed of the small holes 23a, 24a of the conical plates 23, 24 and the intermediate space 25. The air passage 26 allows air to flow between the float chamber 4 and the air chamber 7, and when the fluid in the fluid pipe pulsates and blows up into the float chamber 4, the air passage 26 It is designed to prevent splashing into the chamber 7 and valve chamber 5. At the tops of the conical plates 23, 24, through holes 23b, 24c for inserting the wire ropes 15 are bored so that the ropes 15 can move up and down without interfering with the conical plates 23, 24. .

The splash stopper 22 on the wire rope 15 side is formed by a single conical plate, and the valve element 11 passes from the lower limit position to a large diameter from the annular stopper 24b of the splash stopper 21 on the air chamber 7 side. It is attached with a space longer than the stroke until the pores 13a are closed. The splash stopper 22 prevents the effect of the splash together with the splash stopper 21 on the side of the air chamber 7, and also prevents the splash stopper 22 from moving to the annular stopper 24b when the float 9 rises rapidly while losing its posture due to the blowing up of the fluid. By abutting against, the behavior of the float 9 is suppressed and a stable posture can be secured as much as possible. Further, when the stroke of the float 9 is short, the annular stopper 24b may be extended downward more than in the embodiment so as to receive the float 9.

In the lower valve 16, a lower valve shaft 16b connected to the head 16a is guided by a collar 27, the above-described link mechanism 14 is connected to the valve shaft 16b, and the lower valve 16 is suspended from the link mechanism 14. The float 9 is suspended on the wire rope 15 thus obtained. This lower valve 16 is in a lower lower limit position against the elastic force of the coil spring 12 due to its own weight and the weight of the link mechanism 14, etc., in a state where the float 9 is not subject to buoyancy from the liquid surface. It is in. Further, when the float 9 receives a buoyancy force due to the rise of the fluid level and rises in the guide rib 8, the lower valve 16 moves upward in the valve chamber 5 by the elastic force of the coil spring 12.

On the other hand, the upper valve 17 is formed in a reverse bottomed cylindrical shape in which the upper portion of the cylindrical portion 17b is closed by a lid plate 17a, and the head portion 16a of the lower valve 16 is housed therein. A small-diameter vent hole 28 is formed through the cover plate 17a in the vertical direction so that a smaller amount of air than the large-diameter vent hole 13a can flow through the small-diameter vent hole 28. On the inner surface of the cylindrical portion 17b connected to the cover plate 17a, a plurality of engaging pins 29 are provided so as to project, and the head portion 16a of the lower valve 16 housed inside is retained. Further, the space between the engagement pin 29 and the cover plate 17a is set to be wider than the thickness of the head portion 16a of the lower valve 16, and this gap is independent of the other of the upper and lower valves 16 and 17, regardless of the other. It can move up and down.

Valve head seals 16c and 17c are embedded in the upper surface of the head portion 16a of the lower valve 16 and the lid plate 17a of the upper valve 17, respectively, and when these upper and lower valves 16 and 17 move upward, The valve seat seal 16c of the lower valve 16 is seated on the valve seat 17d of the upper valve 17, and the valve seat seal 17c of the upper valve 17 is seated on the upper valve seat 13 so that the large-diameter vent hole 13a and the small-diameter hole 13a communicate with each other. Each of the pores 28 is closed.

Next, the operation of the present embodiment configured as described above will be described.

1 and 2 show a state in which there is no fluid in the valve box 2, the float 9 is lowered below the float chamber 4, and the weight of the float 9 causes the lower valve 16 and the upper valve 17 to move. However, the small-diameter vent hole 28 is closed and the large-diameter vent hole 13a is opened. The float valve body 19 is also below the float valve chamber 6 seated on the bottom plate 18a of the cylindrical guide 18, and has an atmosphere communication hole 3 opened. The float chamber 4 communicates with the large diameter ventilation hole 13a and the atmosphere. It communicates with the outside through the hole 3. The fluid filling of the fluid piping is performed in this state, and a large amount of the air in the fluid piping that has replaced the fluid is discharged to the outside through the atmosphere communication hole 3.

Next, when the fluid piping is started to be filled with water and the fluid flows into the float chamber 4, the float 9 rises due to the rise of the liquid level, and the lower valve 16 of the valve body 11 The urging force of the coil spring 12 causes the head 16a to move upward with the upper valve 17 placed thereon. Then, when the fluid pipe is filled with water and the float chamber 4 reaches a predetermined liquid level, the valve seat seal 17c of the upper valve 17 is seated on the valve seat 13 to block the large-diameter vent hole 13a and to close the air flow. Stop the discharge (Figs. 3 and 4).

The air in the fluid flowing through the fluid pipe is continuously discharged to the valve box 2 through the fluid in the float chamber 4 even after the discharge from the air valve body 1 is stopped in this way. Therefore, the liquid is gradually accumulated in the valve chamber 5, the air chamber 7, and the large-diameter body portion 4a of the float chamber 4, which are defined between the large-diameter vent hole 13a and the liquid surface of the float chamber 4. To descend. At the same time, the float 9 descends and the lower valve 16 connected by the link mechanism 14 and the wire rope 15 moves downward.

On the other hand, the upper valve 17 is continuously urged upward by the pressure on the upper surface of the liquid surface and stays at the upper limit position for closing the large-diameter vent hole 13a. It is suspended at an intermediate position where it abuts on the engagement pin 29 (FIG. 5). As a result, the valve seat seal 16c of the lower valve 16 is separated from the valve seat 17d of the upper valve 17, and the small-diameter vent hole 28 is opened, so that the air compressed on the upper part of the liquid surface is reduced to the outside through the small-diameter vent hole 28. The amount is discharged.

Due to this discharge, the pressure above the liquid surface gradually decreases, and the upper valve 17 that has been biased upward moves downward together with the lower valve 16 and returns to the lower limit position in FIGS. 1 and 2. Then, the large-diameter vent hole 13a opens. Alternatively, even when the liquid level in the float chamber 4 drops and the float 9 and the lower valve 16 move downward, the head 16a of the lower valve 16 contacts the engaging pin 29 and the upper valve 17 is forced. Lower. When draining the fluid in the fluid pipe, the valve body 11 becomes the state of FIGS. 1 and 2, and as the fluid decreases, a large amount of air is introduced into the fluid pipe through the large-diameter vent hole 13a. Go.

When the fluid in the fluid pipe pulsates due to pressure fluctuation, the fluid is blown up into the valve box 2, and the fluid flows between the valve seat seals 16c and 17d of the lower valve 16 and the valve seat seal of the upper valve 17. When foreign matter such as earth and sand contained in the fluid is caught between the valve seat seal 17c and the valve seat 13 or the valve seat seals 16c, 17c are damaged, the valve seat seals 16c, 17c and the valve seats 17d, 13 However, the blown-up fluid rises to the float valve chamber 6 through the large-diameter vent hole 13a, and the float valve body 19 floats on the liquid surface of the fluid to seal the valve seat 20 liquid-tightly. Therefore, the fluid does not overflow to the outside of the air valve 1 (Fig. 6).

In the splash stoppers 21 and 22 provided in the air chamber 7 and the wire rope 15, while the air flow path between the float chamber 4 and the air chamber 7 is secured, the blow-up due to the pulsation of the fluid is prevented. The large-diameter body portion 4a of the chamber 4 is prevented from going to the upper air chamber 7 as much as possible. That is, the spray stoppers 21 and 22 themselves have a conical shape which is effective in preventing the fluid from being blown up, and in the spray stopper 21 on the air chamber 7 side, the fluid is moved upward by the labyrinth-like air passage 26. Even if the fluid may rise above the spray stopper 21, the tapered shape of the conical plates 23 and 24 and the internal air passage 26 facilitate drainage into the float chamber 4. There is.

On the other hand, in the spray stopper 22 on the wire rope 15 side, when the filling of water is completed (FIGS. 3 and 4) and when the air in the valve box 2 is exhausted under pressure where the air flows through the small-diameter vent hole 28 (FIG. 5). In addition, it moves upward in accordance with the movement of the float 9 and closes the distance between the spray stopper 21 and the conical plate 24, so that it becomes difficult for the fluid to enter the air passage 26. Further, when the fluid in the fluid pipe is blown up into the float chamber 4 and the float 9 jumps up, the wire rope 15 bends and the splash stopper 22 abuts against the annular stopper 24b, so that the jumping height of the float 9 is kept low. be able to. Furthermore, the float 9 is not caught on the upper wall and does not drop onto the liquid surface, nor is it hit and damaged, and can be dropped to a predetermined position in a stable posture.

According to the above-mentioned splash stoppers 21 and 22, it is difficult for the fluid in the float chamber 4 to move upward from the air chamber 7, so that the sludge and dust contained in the fluid adhere to the valve chamber 5 and become trapped. It will not cause malfunctions or overflow to the outside.

In the above-described embodiment, the air passage is formed inside the splash stopper on the air chamber side, but a gap may be set between the outside of the splash stopper and the air chamber to use this as the air passage. Yes. Further, the splash preventer of the present invention may be provided directly on the upper portion of the float, and further, any one of the air chamber, the float and the rope, or a combination of two or three may be used. It does not matter if the shape is other than the conical shape.

[0033]

[Effect of device]

 INDUSTRIAL APPLICABILITY As described above, the air valve of the present invention is provided with a small-diameter air chamber connected to the upper portion of the float chamber, and one or more of the float and the rope connecting the float and the valve body. By arranging a splash stop to prevent the fluid from blowing up into the chamber, even if the fluid in the fluid piping blows up into the valve box, it is difficult for the fluid to splash from the air chamber to the upper part. There is less risk that the will collide with the upper wall and be damaged, and the float can be dropped to a predetermined position in a stable posture.

Further, sludge and dust contained in the fluid do not adhere to or get caught in the valve chamber, resulting in poor sealing or malfunction, and further preventing the sludge and dust from overflowing outside the valve box. The function as can be stably exhibited.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a main part of FIG.

FIG. 2 is a sectional front view showing an air valve at the time of mass exhaust and mass intake.

FIG. 3 is a sectional front view showing the air valve in a closed state.

FIG. 4 is an enlarged view of a main part of FIG.

FIG. 5 is a sectional front view of the air valve showing an open state of the small-diameter vent hole.

FIG. 6 is an enlarged sectional view of an essential part of the air valve showing a state where the fluid has risen to the upper portion of the valve box.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Air valve 2 ... Valve box 3 ... Atmosphere communication hole 4 ... Float chamber 5 ... Valve chamber 6 ... Float valve chamber 7 ... Air chamber smaller than the large diameter body part 4a of the float chamber 9 ... Float 11 ... Valve body 12 ... Coil spring 13 ... Valve seat 13a ... Large diameter ventilation hole 14 ... Link mechanism 15 ... Wire rope 16 ... Lower valve 17 ... Upper valve 19 ... Float valve body 20 ... Valve seat 21, 22 ... Splash stop 23, 24 ... Cone Plate 23a, 24a ... Small hole 23b, 24c ... Through hole 24b ... Annular stopper 25 ... Intermediate space part 26 ... Air passage 28 ... Small diameter ventilation hole 29 ... Engagement pin

Claims (1)

[Scope of utility model registration request] 1. A float chamber is provided in a lower portion of a valve box connected to a fluid pipe, and a float accommodated in the float chamber is
By moving upward by raising the liquid level of the fluid overflowing from the fluid pipe to the float chamber, the valve element arranged in the valve chamber above the valve box is moved upward, and is continuously connected to the upper portion of the valve chamber. In the air valve, which closes the vent hole with a valve element, blocks the discharge of air in the fluid pipe, and provides an air chamber having a diameter smaller than that of the float chamber between the float chamber and the valve chamber, Any one or more of the ropes connecting the air chamber and the float and the rope connecting the float and the valve body is provided with a splash stopper for preventing the fluid from being blown up from the float chamber to the air chamber. And an air valve.