WO2001084027A1

WO2001084027A1 - Valve device and pipeline system

Info

Publication number: WO2001084027A1
Application number: PCT/JP2001/003762
Authority: WO
Inventors: Hiroshi Yokota; Mario Miura; Tetsuya Tanimoto; Masayuki Akiyama; Kunio Ogura
Original assignee: Kabushiki Kaisha Yokota Seisakusho
Priority date: 2000-04-28
Filing date: 2001-05-01
Publication date: 2001-11-08
Also published as: AU2001252664A1; JP4906215B2

Abstract

A valve device capable of automatically and surely performing such an opening and closing control that, when gas is forced to be passed after liquid is passed, a pipeline is cut out, providing excellent sealability at the time of valve closing and stable operation, and making difficult for a chattering, hunching, or water hammer to occur immediately before valve closing or the moment the valve starts to open, and automatically exhausting the residual gas inside the pipeline at the time of start of or during the feeding of the liquid; and a pipeline system capable of being controlled automatically by the use of the valve device; the valve device, characterized by comprising a valve having a valve disc interlocked with a float opening when the float rises and closing when the float lowers and an auxiliary valve closed when an acting force of a specified value or higher caused by a pressure inside a flow path is added thereto and opened when the added force is removed, the pipeline system, characterized in that the valve device is installed at the inlet of a terminal device in the pipeline system allowing the residual liquid inside the pipeline to be drained by the force-feeding of the gas into the pipeline after the liquid is fed to at least one terminal device through the pipeline.

Description

Valve device and pipeline system

Technical field

TECHNICAL FIELD The present invention relates to a valve device for shutting off a pipe line when gas is allowed to pass after passing a liquid, and a pipe line stem system using the valve device. It should be noted that in this specification

The word "water" is used to generically represent liquid, the word "air" is gas, and the word "fluid" is generic to liquid and gas.

Background art

Recent field irrigation covers not only plain farmland on flat lands, but also sloping lands, orchards and fields with elevations, and water is supplied by pumps, etc., and sprinklers, perforated pipes, nozzles, etc. Pipeline systems that spray from) are common. From the standpoint of labor saving and multi-purpose automation, in addition to watering, pesticides, liquid fertilizers, etc. (hereafter referred to collectively as “chemicals”) are mixed with mixing equipment and sprayed from the same sprayer. The method is widespread. In this case, it is costly to leave the chemical solution remaining in the pipeline as it is after the spraying operation as it is, which increases the cost.

Methods for treating the residual liquid include a recovery method, a water extrusion method, and a pneumatic method. The recovery method is to collect the residual liquid using a separate pipe, etc.If the natural fall of the residual liquid is to be used, it is likely to be restricted by topographical conditions, etc.The water extrusion method is to extrude and spray the residual liquid by sending water There is a danger that the chemical sprayed at the right angle may be washed away with water. On the other hand, the pneumatic method uses the compressed air to push out and spray the residual liquid, and the chemical liquid can be completely used. However, this is drawing attention as the most rational method.

The specific mechanism of this air pressure utilization method is as illustrated in FIG. 19, and the chemical solution from the liquid storage tank 52 is supplied in the middle of the pipeline 71 supplied by the water supply pump 51 and the like. A mixing device 53 for mixing is provided, and is further connected to a pipeline fed from a compressor 56 and a pressure tank 57, and then connected to each sprayer B. The inlet side of each sprayer B is provided. Is equipped with a valve A that allows liquid to pass through but not gas (hereinafter referred to as “liquid open / close valve”). 54 and 58 are on-off valves for switching between liquid supply and air supply, and 55 and 59 are check valves for preventing liquid and air supply from entering each other. Then, when the application of the chemical solution is completed, the supply source is switched from liquid supply to air supply, compressed air is sent into the pipeline 71, and the residual liquid is simultaneously ejected from each sprayer B. For sprayer B, which has finished jetting, the liquid opening / closing valve A is sequentially closed and the air jetting is automatically stopped to prevent loss of air pressure.

By the way, as the liquid open / close valve A conventionally used for this purpose, the one illustrated in FIG. 20 is known. The mechanism is as follows: In a valve box 1 equipped with an inlet flow path a and a valve seat 11 at the lower part, and a float chamber b and an outlet flow path f at the upper part, a float 12 also serving as a valve element rises and falls. Float 12 rises by buoyancy when liquid is injected from inlet channel a to open valve port c between valve seat 11 and float 12 when air is injected. It loses its buoyancy and descends, closing its valve port c by its own weight.

However, the conventional liquid open / close valve A has the following problems.

(1) Air leakage occurs when the valve is closed.

(2) Vibration and noise are likely to occur immediately before the valve closes or at the moment when the valve starts to open due to so-called “chattering” and “hunting” phenomena. (3) Due to the characteristic that the valve must be closed by the float's own weight when air is injected, residual air cannot escape at the start of water flow, which may hinder water flow. Therefore, a cumbersome operation such as manually evacuating separately is required.

Regarding the problems (1) and (2), it is considered that simply increasing or increasing the float 12 only increases the cost and does not solve the problem. Because, when the operation of the liquid open / close valve A is observed in detail, when the valve port c is open, the flow through the float chamber b depends on whether the liquid passing through the float chamber b is liquid or gas. Since a clear buoyancy difference that raises and lowers 1 2 is generated, it can operate by sensing that the liquid has been switched to gas, but once the valve port c is closed, the float chamber b enters the inlet. Since nothing is blocked by the flow path a and nothing comes in, there is no change in the buoyancy of the float 12, and it is clear even if the thing coming to the inlet side of the valve port c switches from liquid to gas. Can not be sensed. That is, the conventional liquid-opening / closing valve A lacks the ability to discriminate between liquid and gas when the valve is closed, and therefore can generate a valve-closing force that clearly blocks only gas. It is probable that air leakage occurs or chattering or hunting occurs immediately before the valve closes or at the moment when the valve starts to open due to the ambiguity of the valve closing force. The problem (3) is the reverse of the problems (1) and (2). If the problems (1) and (2) are solved and the gas is clearly shut off, If this is possible, the residual air in the pipeline 71 will not escape at the start of water flow immediately after installation of the valve device or at the time of re-water flow after a long time has elapsed, and water flow will not occur unless separate exhaust operations are performed. The inconsistency of not being able to be created.

Therefore, the present invention drastically solves these problems of the conventional technology, and is easy and compact in design, manufacture, and maintenance, and inexpensive. In addition to automatically and reliably performing opening / closing control to shut off the valve, the airtightness when the valve is closed is good, the operation is stable and chattering, hunting, water hammer etc. The purpose is to obtain a valve device that is unlikely to occur. In addition, a valve device that automatically exhausts gas remaining in the pipeline at the start of liquid supply and during liquid supply, and is capable of fully automatic operation throughout the entire operation process. The purpose is to gain. Another object of the present invention is to obtain a pipe system which can be easily and economically automatically controlled using the valve device. Disclosure of the invention

In order to achieve the above object, a configuration of the present invention comprises a valve which opens when a float rises and closes when the float descends, and a valve which closes when an operation force due to a pressure in a flow passage of a predetermined value or more is applied. However, it is characterized by having a sub-valve that opens when the addition is released.

Further, in the configuration of the present invention, the float is provided so as to be able to move up and down on the inlet side from the valve port provided between the inlet flow path and the outlet flow path of the valve box, and the valve body interlocking with the float is A valve configured to open the valve port when the float is raised, and to close the valve port when the float is lowered; And a sub-valve configured to be closed and open when the addition is released to communicate the inlet flow path with the outlet flow path or the outside of the flow path system.

For the auxiliary valve, the auxiliary float on the inlet side than the secondary valve port is provided vertically movable, in conjunction with the sub-valve fitness ⁵ ¾ sub float, to close the sub valve opening when the sub float rises It may be configured.

Further, the valve and the sub-valve may be formed integrally.

Further, a balance means for receiving a pressure of the fluid in a direction opposite to a direction in which the pressure of the fluid acts on the valve and canceling out at least a part of the acting pressure of the fluid related to the valve body may be provided.

Further, an auxiliary valve is interposed between the inlet flow path and the outlet flow path of the valve, and the auxiliary valve closes when a pressure difference before and after the valve exceeds a predetermined value, and when the pressure difference is released. It may be configured to open.

Further, a throttle means may be provided in the fluid passage. Further, a mechanism for spraying the liquid may be provided on the outlet side.

Still another embodiment of the present invention is a liquid crystal display device, wherein a liquid is supplied to at least one terminal device via a pipe, and then gas is injected into the pipe, whereby the liquid is supplied to the pipe. In a pipeline system in which residual liquid is removed, any one of the valve devices described above is interposed on the inlet side of the terminal device.

An on-off valve for opening to the atmosphere may be provided in the pipeline.

Also, at least one of the operation operations from the start and stop of liquid supply, the start and stop of gas injection and the return to the state before the start of liquid supply is automatically controlled. Is also good. .

With these configurations, in the present invention, the opening / closing control of shutting off the pipe line when gas is allowed to pass after passing the liquid is automatically and reliably performed, and the airtightness when the valve is closed is good, and the operation is good. A valve device that is stable and hard to cause chattering, hunting, water hammer, etc. immediately before the valve closes or at the moment when the valve starts to open is obtained. Also, at the start of or during liquid feeding, the residual gas in the pipeline is automatically exhausted, so that the operation can be fully automated over the entire stroke. Furthermore, a pipe system that can be easily and economically automatically controlled using this valve device can be obtained. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a longitudinal sectional view of a first embodiment of the valve device of the present invention.

FIG. 2 is a longitudinal sectional view of a second embodiment of the valve device of the present invention.

FIG. 3 is a longitudinal sectional view of a third embodiment of the valve device of the present invention.

FIG. 4 is a longitudinal sectional view of a fourth embodiment of the valve device of the present invention.

FIG. 5 is a longitudinal sectional view of a fifth embodiment of the valve device of the present invention.

FIG. 6 is a longitudinal sectional view of a sixth embodiment of the valve device of the present invention.

FIG. 7 is a longitudinal sectional view of a seventh embodiment of the valve device of the present invention. FIG. 8 is a longitudinal sectional view of an eighth embodiment of the valve device of the present invention.

FIG. 9 is a longitudinal sectional view of a ninth embodiment of the valve device of the present invention.

FIG. 10 is a longitudinal sectional view of a tenth embodiment of the valve device of the present invention.

FIG. 11 is a longitudinal sectional view of a eleventh embodiment of the valve device of the present invention.

FIG. 12 is a longitudinal sectional view of a 12th embodiment of the valve device of the present invention.

FIG. 13 is a longitudinal sectional view of a thirteenth embodiment of the valve device of the present invention.

FIG. 14 is a longitudinal sectional view of a 14th embodiment of the valve device of the present invention.

FIG. 15 is a longitudinal sectional view of a fifteenth embodiment of the valve device of the present invention.

FIG. 16 is a longitudinal sectional view of a 16th embodiment of the valve device of the present invention.

FIG. 17 is a longitudinal sectional view of a seventeenth embodiment of the valve device of the present invention.

FIG. 18 is an explanatory diagram of an embodiment of the pipeline system of the present invention.

FIG. 19 is an explanatory diagram showing an example of a conventional pipeline system using a pneumatic system.

FIG. 20 is a longitudinal sectional view showing an example of a conventional liquid open / close valve. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described in more detail with reference to the drawings showing examples. In the drawings, common parts are denoted by common reference numerals.

FIG. 1 shows a first embodiment of the valve device of the present invention. The inlet side of the valve box 1 of this device is connected to the supply source of liquid and gas through a pipeline, and the outlet side is connected to a sprayer. That is, this device is installed at a location corresponding to A in FIG. Inside the valve box 1, there are a flow path from the inlet flow path a to the outlet flow path f1 via the float chamber b and the valve port c, and a flow path from the inlet flow path a to the sub-float chamber d and the sub-valve port. An outlet flow path through e is provided: a flow path leading to f2.

In the float chamber b on the inlet side of the valve port c, a float 12 is installed so as to be able to move up and down. It is supported to be able to. Between the float 12 and the inner wall of the valve box 1, a sufficient flow path through which a liquid or gas can pass is secured. A valve body 13 is attached to the float 12 (in the case of this embodiment, formed integrally with the float 12) so as to be separated from and connected to a valve seat 11 provided at a valve port c. The specific gravity of the float 12 is set smaller than the passing liquid, and the diameter of the valve port c is set to an appropriate size. 2, the valve port c is opened when it rises, and the valve port c is closed when it descends. The valve body 13 has a role of opening and closing control of shutting off a pipeline when gas passes through the liquid. .

On the other hand, in the sub-float chamber d on the inlet side of the sub-valve port e, a sub-float 22 is provided so as to be able to move up and down freely, and is supported by a suitable guide or a bearing (not shown) so that it can be moved up and down with little lateral vibration ing. A sufficient flow path through which gas can pass is secured between the sub-float 22 and the inner wall of the valve box 1. A sub-valve 23 is attached to the sub-float 22 (in the case of this embodiment, it is formed integrally with the sub-float 22) so that the sub-floor 22 is separated from and connected to the sub-valve seat 21 provided at the sub-valve port e. It has become. The specific gravity of the sub-float 22 is set smaller than that of the passing liquid, and the sub-valve e is set to an appropriate size, so that the sub-valve 23 linked with the sub-float 22 is formed. The secondary valve port e is closed when the upward acting force (buoyancy of the secondary float 22 or the internal pressure at the inlet flow path a side of the valve box 1) is increased by a predetermined value or more, and the secondary valve port e is lowered by releasing the addition. It is configured to sometimes open the sub-valve port e. The sub-valve 23 plays a role of automatically exhausting the residual gas at the start of the liquid sending.

In the present embodiment, the outlet flow path 1 is preferably formed at an upper portion of the valve box 1, for example, at a position above the upper operation limit of the sub-float 22. The outlet flow path f2 is preferably connected to the outside of the flow path system, for example, to the atmosphere. However, the outlet flow path f2 may be combined with the outlet flow path 1 to form a single outlet flow path. The operating mode of the present invention will be described with reference to FIG. 1. At the start of liquid feeding, since both the float 12 and the sub-float 22 are initially lowered, the valve port c is closed and the sub-valve is closed. The port e is in an open state, and the liquid flows into the valve box 1 while exhausting the residual gas in the pipe through the path of the inlet flow path a—sub valve port e—exit flow path f 2. As the liquid level in the valve box 1 rises, the float 12 rises to open the valve port c, and the liquid flows out of the inlet channel a, the valve port c, and the outlet channel f1. On the other hand, as the liquid level rises, the sub-float 22 also rises, and eventually closes the sub-valve port e to prevent the liquid from overflowing.

When the liquid supply is stopped, the outlet flow path f1 is formed at the upper part of the valve box 1, so that the liquid remains in the valve box 1, so that both the float 1 2 and the sub-float 22 remain elevated, The valve port c is kept open and the secondary valve port e is kept closed.

Next, when air supply is started to push out the residual liquid in the pipeline, the residual liquid displaced by the gas pressure flows out of the outlet flow path f1, and floats as the liquid level falls. Descends and eventually closes the valve port c, energizing the gas pressure in the valve box 1 in addition to the weight of the float 12, so that the airtightness is maintained tightly. At this time, the gas pressure in the valve box 1 is added upward while the sub valve port e is closed, so that the sub-float 22 drops even if the liquid level in the valve box 1 drops. And it remains closed by sticking to the sub-orifice e. Therefore, after the liquid is removed from the valve box 1, both the valve port c and the sub-valve port e are closed, thereby blocking the passage of gas.

Then, after the end of the air supply, when the gas supply source is released to the atmosphere and the gas pressure in the pipe is released, the inside of the valve box 1 also becomes the atmospheric pressure, so the sub-float 22 falls by its own weight, e opens and returns to the original state.

All of the above series of operations are performed automatically and reliably, and it is sufficient for the driver to operate at the liquid or air supply source. Is completely unnecessary, and the operation can be fully automated over the entire process. Also, since the float 12 is provided on the inlet flow path a side rather than the valve port c, the valve Regardless of whether the mouth c is open or closed, there is a clear difference in buoyancy between when there is a liquid at the inlet side and when there is a gas, and it may be possible to sufficiently distinguish between liquid and gas. Because of the good sealing performance when the valve port c is closed and no gas leakage, and because the valve closing force is not ambiguous, it is natural that chattering and hunting occur immediately before the valve closes and at the moment when the valve starts to open. Hateful. Since the gas remaining in the pipeline is automatically evacuated at the start of liquid feeding, there is no need to perform a separate evacuation operation, which is extremely convenient. In particular, in the case of the present embodiment, the valve closing force against the valve port c is not only the weight of the float 12 but also the gas pressure in the valve box 1, so that the flow is set every time the air pressure is set. —Because there is no need to adjust and set the weight of the gate 12, there is a special advantage that standardization is easy and it can be manufactured at low cost.

FIG. 2 shows a second embodiment of the present invention, in which the float 12 and the sub-float 22 in the first embodiment can be brought into contact with each other along a common guide 2. It is arranged. When the float 12 rises, the sub-float 2 2 is also pushed up in connection with the float 12. As for the inlet channel a, a guide channel (a deflector 1) for preventing the dynamic pressure of the flow from adversely affecting the operation of the floats 12 and 22 will be exemplified. is there. The outlet channel # 1 is illustrated as an example in which a replaceable fixed throttle means 31 (fixed orifice) for uniformizing the discharge pressure of each sprayer is inserted. Other configurations and operation modes are the same as those of the first embodiment, and thus detailed description is omitted.

FIG. 3 shows a third embodiment of the present invention, in which the fixed diaphragm means 31 in the second embodiment is replaced by a variable diaphragm means, and the diaphragm adjuster 32 is used. It was made adjustable. Thus, not only can the discharge pressure of each sprayer be made uniform, but also by adjusting the acting force of the throttle means 31 so that the liquid is not discharged until the liquid pressure reaches a predetermined value. Discharger discharge start timing can also be adjusted. Other configurations and operation modes are the same as those of the second embodiment, and thus detailed description is omitted. FIG. 4 shows a fourth embodiment of the present invention, in which the vertical arrangement of the floats 12 and the sub-floats 22 in the third embodiment is replaced by a horizontal arrangement. It is. An example of a guide channel (a deflector) is shown near the inlet channel a. Also, when the liquid supply is stopped, the throttle means 31 biased by the throttle adjusting unit 32 automatically closes the valve port c and the liquid remains in the valve box 1. It is also shown that there is no need to consider such as disposing it on the upper part of the valve box 1, and it is optional. Other configurations and operation modes are the same as those of the third embodiment, and thus detailed description is omitted.

FIG. 5 shows a fifth embodiment of the present invention. In the fourth embodiment, the valve element 13 is formed integrally with the sub-valve element 23 by also having the function of the sub-valve element 23. Things. More specifically, the urging means 4 3 (in this embodiment, the compression means in this embodiment, which applies the urging force in the valve opening direction of the valve 13 at the same time as being integrated with the secondary valve 23 A spring) is provided, and this biasing force can be adjusted by a biasing force adjusting section 44. By adjusting this biasing force in addition to the setting of the buoyancy and the weight of the float 12, the valve 13 is slightly lifted from the valve seat 11 before operation of the device, and there is a gap. That is, the valve port c is set to be slightly opened. The mode of operation will be described with reference to FIG. 5.At the start of liquid feeding, the valve port c, which is slightly open, will not close because the pressure of residual gas in the pipeline is not so high. Therefore, the liquid flows into the valve box 1 while exhausting the residual gas through the path from the inlet channel 3 to the valve port C—the outlet channel f. As the liquid level in the valve box 1 rises, the float 1 2 ′ rises to fully open the valve port c, and the liquid flows out through the path of the inlet channel a—the valve port c—the outlet channel f.

When the liquid supply is stopped, not only when the liquid remains in the valve box 1 but also when the liquid falls out without retaining, the valve port c is open because the urging force of the urging means 43 is applied. Is maintained.

Next, when air supply is started to push out the residual liquid in the pipeline, the gas pressure Residual liquid displaced by this flows out of the outlet channel ί, and the float 1 2 descends as the liquid level falls.At this time, the gas pressure in the valve box 1 in addition to the weight of the float 12 The valve port c is closed by overcoming the urging force of the urging means 43 as it is, and the airtightness is firmly maintained. Therefore, after the liquid is removed from the valve box 1, the valve port c is closed, and the passage of gas is shut off.

Then, after the end of the air supply, when the gas pressure in the pipe is released by opening the air supply source to the atmosphere and the inside of the valve box 1 also becomes the atmospheric pressure, the valve body 13 is biased by the biasing means 4 3 The valve port c is slightly opened, that is, returns to the initial state. As described above, the provision of the urging means 43 plays a role of automatically exhausting the residual gas at the start of the liquid feeding, similarly to the configuration around the sub-valve 23 of the fourth embodiment. It can be fully automated throughout the entire operation. Also, by applying such a biasing means 43 to the technical means of offsetting the weight of the float 12, the float 12 is made of a rather heavy material to increase the amount of inertia, thereby increasing its inertia. The vibration near the valve closure can be further suppressed by the resistance. Other configurations and operation modes are the same as those of the fourth embodiment, and thus detailed description is omitted.

FIG. 6 shows a sixth embodiment of the present invention, in which the structure is further simplified while applying the principles of the fifth embodiment. A tension spring is used as the urging means 43 instead of the compression spring of the fifth embodiment, and the urging force can be adjusted by the urging force adjusting unit 44. Other configurations and operation modes are the same as those of the fifth embodiment, and thus detailed description is omitted.

FIG. 7 shows a seventh embodiment of the present invention. While applying the principle of the fifth embodiment, the pressure of the fluid in the direction opposite to the pressure acting direction of the fluid on the valve body 13 is increased. A balance means is provided for receiving the force and canceling out at least a part of the working pressure of the fluid related to the valve body 13. That is, the urging means 43 on the outlet flow path f1 side of the valve port c is further provided with a pressure receiving plate 41, and the pressure receiving plate 41 is provided with a seal. The bag chamber g, which is attached to the valve box 1 so as to be able to move up and down via the member 41s, and is hermetically enclosed between the pressure receiving plate 41 and the valve box 1, is connected to the float chamber b by the communication passage 42. It is communicated. In the present embodiment, the pressure receiving area of the pressure receiving plate 41 is set substantially equal to the pressure receiving area of the valve body 13.

The valve body 13 is connected to the pressure receiving plate 41 in the vicinity of the valve closing. At this time, the internal pressure of the float chamber b for pushing down the valve body 13 and the internal pressure of the bag chamber g for pushing up the pressure receiving plate 41 are the same. Therefore, the partial pressures before and after the valve element 13 are canceled and balanced. Therefore, the acting force for opening and closing the valve 13 is independent of the pressure of the liquid supply and the air supply, and the own weight of the movable parts such as the float 12, the valve 13, the pressure receiving plate 41, and the float 12 Since it is determined only by the relationship between the buoyancy and the urging force of the urging means 43, the operation of the valve 13 does not become unstable even if it is installed in a pipe with unstable pressure. It operates accurately in response to the change in the liquid level in the valve box 1. Since the pressure balance means is not affected by the uneven pressure around the valve body 13, the diameter of the valve port c can be made relatively large, and the float 12 can be made compact.

Regarding the relationship between the pressure receiving area of the valve element 13 and the pressure receiving area of the pressure receiving plate 41, it may be possible to select to cancel only a part of the partial pressure before and after the valve element 13 without completely balancing them. Various settings can be made according to the operating conditions while adjusting the biasing force of 3 in the biasing force adjusting section 4 4. As the seal member 41 s of the pressure receiving plate 41, a diaphragm type is illustrated in this figure, but it is a matter of course that other types such as a bellows and a seal ring may be used. Regarding the communication path 42 that connects the bag chamber g and the float chamber b, it is possible to eliminate the fine flow path by taking a sufficient passage inner diameter, and the fluid passing therethrough is not a unidirectional flow. Since the flow is dead-end and reciprocating in the bag room g, clogging by foreign matter such as trash “sand grains” and dust is not likely to occur. In this embodiment, the configuration around the sub-valve 23 as in the first embodiment is provided in order to more reliably play the role of automatically exhausting the residual gas at the start of liquid feeding. Are illustrated. Other configurations and operation modes are the first implementation The detailed description is omitted because it is the same as the example and the fifth embodiment.

FIG. 8 shows an eighth embodiment of the present invention, wherein the arrangement of the float 12 and the valve body 13 is changed while applying the principle of the first embodiment. In this embodiment, there is no change in the configuration in which the float 12 is provided on the inlet flow path a side of the valve port c, but the valve body 13 has the outlet flow path ί side with the valve port c interposed therebetween. The float 12 and the valve body 13 are connected by a connecting member 14. The weight of the movable part such as the float 12, the valve 13 and the connecting member 14 is set so as to exceed the gas pressure at the time of the air supply so that the valve can be closed. In addition, an example is shown in which the sub-valve 23 is provided on the valve 13 in the form of a slave valve to make it compact. In this embodiment, the operation as a whole is the same as that of the first embodiment, but the difference is that the valve body 13 moves the valve port c in the flow direction as in the first embodiment. The point is not to close along but to close against the flow direction. For this reason, the valve closing force is only the weight of the movable part such as the float 12 and the like, and the internal pressure of the valve box 1 cannot be used. At certain times, there is a clear difference in buoyancy, and liquid and gas can be distinguished sufficiently, so that the valve closing force can fully utilize the weight of the movable part such as the float 12. Therefore, since the sealing property at the time of closing the valve is good and the valve closing force is not ambiguous, chattering and hunting near the valve closing are unlikely to occur.

In addition, as for the configuration around the sub-valve 23, there is also a method in which the sub-float 22 is not attached and the predetermined weight is kept. Looking at the operation in that case, before the operation, the sub-valve 23 was opened by its own weight, and at the start of liquid feeding, the sub-valve 23 was not so high because the pressure of the residual gas in the pipeline was not so high. The residual gas is exhausted while the valve 23 remains open, and when the liquid flows into the valve box 1, the sub-valve 23 closes due to the liquid pressure, and is then switched to air supply. The closed state is maintained by the gas pressure, and after the end of the air supply, if the air source is opened to the atmosphere and the gas pressure in the pipeline is released, the pressure inside the valve box 1 also becomes atmospheric pressure. Auxiliary valve The body 23 falls by its own weight and returns to the initial valve-open state. Therefore, even if the sub-float 22 is not provided, as long as the own weight of the sub-valve 23 is appropriately set, almost the same operation and effect as the case where the sub-float 22 is provided can be obtained. . Other configurations and operation modes are the same as those of the first embodiment, and thus detailed description is omitted.

FIG. 9 shows a ninth embodiment of the present invention, in which the configuration around the sub-valve 23 in the eighth embodiment is shown. It has been replaced by Other configurations and operation modes are the same as those of the fourth and eighth embodiments, and thus detailed description is omitted. '

FIG. 10 shows a tenth embodiment of the present invention, in which the float 12 and the sub-float 22 of the ninth embodiment are integrated, and the float chamber b and the sub-float chamber d are also integrated. It was integrated into the room. Since the float 12 needs its own weight to generate a valve closing force when the valve port c is closed, a weight 33 is particularly provided.Instead, an appropriate urging means is provided. Needless to say, it is good. Other configurations and operation modes are the same as those in the ninth embodiment, and thus detailed description is omitted.

FIG. 11 shows a first embodiment of the present invention, in which the configuration around the sub-valve 23 of the ninth embodiment is built in the float 12 to make it compact. It is. For this reason, in this embodiment, as the passage from the sub-float chamber d provided inside the float 12 and the sub-valve port e to the outlet flow path f, the communication passage in which the connecting member 14 is hollow is used. I'm using 24. In order to prevent the dynamic pressure of the flow from blowing up the sub-float 22 and adversely affecting the operation of the sub-float chamber d, a guide flow path is provided at a plurality of locations as appropriate, and the sub-float is introduced. The arrangement in which the flow entering chamber d is dispersed is shown. In addition, an example is shown in which an urging means 43 for the valve 13 and an urging force adjusting section 44 for adjusting the urging force are provided so that the valve closing force of the valve 13 can be appropriately adjusted.

Looking at the operation of the present embodiment, at the start of the liquid feeding, since both the float 12 and the sub-float 22 are initially lowered, the valve port c is closed, and the sub-valve port e is opened. The liquid flows into the valve box 1 while exhausting residual gas in the pipeline through the sub-valve port e—communication path 24. As the liquid level in the valve box 1 rises, the secondary float 2 2 rises, closes the secondary valve port e, and closes the secondary valve port e ^! Rises to open the valve port c, and the liquid flows out. Thereafter, when the mode is switched to the air supply, the float 12 descends and closes the valve port c while maintaining the state where the sub-valve element 23 is stuck to the sub-valve port e due to the gas pressure and is closed, and the valve port c is closed. Block the passage of gas. Then, after the end of the air supply, when the air supply source is opened to the atmosphere and the gas pressure in the pipe is released, the inside of the valve box 1 also becomes atmospheric pressure, so the sub-float 22 falls by its own weight, and the sub-valve opening e opens and returns to the original state. As described above, even when the configuration around the sub-valve 23 is built in the float 12, the same operation mode as in each of the above-described embodiments can be obtained. Other configurations and operation modes are the same as those in the ninth embodiment, and thus detailed description is omitted.

FIG. 12 shows a 12th embodiment of the present invention. Instead of incorporating the structure around the sub-valve 23 of the 11th embodiment in the float 12, The float 12 is separated from the connecting member 14 and is formed integrally with the sub-float 22. In this case, the weight of the float 1 2 does not contribute to the valve closing force of the valve 13, and instead, the biasing force of the biasing means 4 3 for biasing the valve 13 in the closing direction is reduced by the air supply. It is adjusted and set by the biasing force adjusting section 44 so that the valve can be closed by overcoming the gas pressure at the time.

In the present embodiment, the float 1 2 (and the secondary float 2 2

) Rises, the sub-valve e is closed first, and in that state, it rises further to open the valve c, and the same operation as in the first embodiment is performed.

The outlet flow path f is shown as being discharged and sprayed without being connected to a sprayer. In this way, the valve device itself may be provided with a mechanism for spraying liquid, and may be integrated with the sprayer.The type may be a simple open discharge type as shown in this figure, a sprinkler type, or a nozzle. Design as appropriate May be. Other configurations and operation modes are the same as those of the eleventh embodiment, and a detailed description thereof will be omitted. FIG. 13 shows a thirteenth embodiment of the present invention. The configuration around the body 13 is obtained by adding balance means for canceling the partial pressure as in the seventh embodiment. That is, the urging means 43 is attached to the valve body 13 and a pressure receiving plate 41 is further attached. The pressure receiving plate 41 can be moved up and down to the valve box 1 via the sealing member 41 s. A bag chamber g is hermetically sealed and formed between the pressure receiving plate 41 and the valve box 1 and is communicated with the float chamber b by the communication passage 42. In the present embodiment, the pressure receiving area of the pressure receiving plate 41 is set to be substantially equal to the pressure receiving area of the valve body 13, and the partial pressure before and after the valve body 13 cancels out and balances. As in the case of the example, the operation of the valve 13 does not become unstable even if it is installed in an unstable pipe with a pressure force of ⁵ ', and it accurately responds to changes in the liquid level in the valve box 1 In addition to the operation, the diameter of the valve port c can be made relatively large, and the float 12 can be made compact. As for the relationship between the pressure receiving area of the valve 13 and the pressure receiving area of the pressure receiving plate 41, it may be possible to select to cancel only a part of the partial pressure before and after the valve 13 without completely balancing them. Other configurations and operation modes are the same as those of the seventh embodiment and the 12th embodiment, and thus the detailed description is omitted.

FIG. 14 shows a fourteenth embodiment of the present invention. The sub-float 22 of the ninth embodiment is moved upward from the side-by-side position with the float 12 and arranged. The configuration around the valve body 13 is provided with a balancing means for canceling out the partial pressure as in the thirteenth embodiment. In the present embodiment, the sub-float chamber d is also used as the bag chamber g, and when the sub-valve e is closed by liquid supply or air supply, the sub-float chamber d also functions as the bag chamber g. It has a simple structure. In this figure, a bellows is applied to the sealing member 41 s of the pressure receiving plate 4 JL, the communication passage 42 is integrally formed in the valve box 1, and the float 12 is provided with the valve element 1. With a replaceable weight 3 3 for adjusting and setting the own weight that generates the valve closing force when closing 3 Was exemplified. In addition, an example is shown in which a strainer 145 is provided to prevent foreign substances such as trash 'sand grains' and dust from entering the valve box 1. Other configurations and operation modes are the same as those of the ninth embodiment and the thirteenth embodiment, and thus detailed description is omitted.

By the way, during the liquid feeding of the present apparatus, gas or generated bubbles remaining in various places in the pipeline may enter the valve box 1. Of the above-exemplified embodiments, in the eighth to the 14th embodiments, since the valve port c is provided at the upper part of the valve box 1, the mixed gas lighter than the liquid feed is generated during the liquid transfer. Since the air is automatically exhausted from the open valve port c toward the outlet flow path, it does not adversely affect the operation of the present apparatus, but in the first to seventh embodiments, the valve port c Since the mixed gas gradually accumulates and fills the valve box 1 because it is provided at the bottom of the valve box 1, when the capacity of the valve box 1 is small, the float 12 gradually descends and the valve port c may close and cause malfunction. As a countermeasure, there is a method to make the volume of the valve box 1 large enough.However, if you want to make this device compact, open and exhaust a small amount of mixed gas in the liquid, It is preferable to provide an auxiliary valve that closes a large amount of pressurized gas at the time of air supply.

Therefore, FIG. 15 shows a fifteenth embodiment of the present invention. By adding such an auxiliary valve to the one of the first embodiment, further miniaturization is enabled. It is. In this embodiment, a flow path from the inlet flow path a to the outlet flow path f 3 via the auxiliary valve port h is provided inside the valve box 1, and the outlet flow path f 3 is provided at the outlet flow path f 3. It is in communication with road f1. On the inlet side of the auxiliary valve port h, an auxiliary valve body 47 is provided so as to be able to move up and down so as to be separated from and connected to the auxiliary valve seat 46 provided on the auxiliary valve port h. By appropriately setting the specific gravity of the auxiliary valve element 47 and the diameter of the auxiliary valve port h, when the auxiliary valve element 47 rises due to the action force of gas inflow exceeding a predetermined amount (at the time of air supply), The auxiliary valve port h is closed, and at other times, it is lowered by its own weight to open the auxiliary valve port h. This auxiliary valve element 47 opens and automatically exhausts a small amount of mixed gas during liquid feeding, Has the role of closing and blocking the passage of gas.

The shape and weight of the auxiliary valve element 47 and the shape and diameter of the auxiliary valve port h may be appropriately designed according to the operating conditions of the present apparatus. 4 It is preferable that the specific gravity of 7 is larger than the passing liquid, and the diameter of the auxiliary valve port]! Is smaller than the diameter of the valve port c. It is preferable to form it on the upper part.

Looking at the operation, before the operation, the auxiliary valve element 47 is open due to its own weight, and during the liquid feeding, the outlet flow path ί3 of the auxiliary valve port h is connected to the outlet flow path f1. Is connected to the inside of the valve box 1 and there is almost no pressure difference before and after the auxiliary valve body 47.Therefore, the auxiliary valve body 47 is kept open by its own weight. The mixed gas flowing into the outlet is exhausted toward the outlet channel # 3. After that, it is switched to air supply, the residual liquid in the valve box 1 is discharged, and the valve port c is closed (the auxiliary valve port e is already closed). From that moment on, the air volume and pressure of the air supply are reduced. Since the auxiliary valve element 47 receives everything, the pressure difference before and after the auxiliary valve element 47 suddenly increases, and the auxiliary valve element 47 rises at a stretch to close the auxiliary valve port h. Block the passage of gas. Then, after the end of air supply, if the air supply is opened to the atmosphere to release the gas pressure in the pipeline, the pressure inside the valve box 1 will also be atmospheric pressure, and the pressure difference before and after the auxiliary valve element 47 will be released. However, the auxiliary valve element 47 falls by its own weight, the auxiliary valve port h is opened, and returns to the initial state.

As described above, the embodiment of the present invention has a special advantage that further stabilization of operation and compactness can be easily achieved by adding the function of automatically exhausting the mixed gas during the liquid sending. is there. If the pipeline conditions in which this valve device is installed are stable, the auxiliary valve function can also serve as the sub-valve described above, and the sub-valve can be omitted. is there. Other configurations and operation modes are the same as those of the first embodiment, and thus detailed description is omitted.

FIG. 16 shows a sixteenth embodiment of the present invention. In this case, the float 12, the auxiliary float 22, and the auxiliary valve body 47 are made spherical, and the outlet flow path f1 is housed in the float chamber to make it even more compact. FIG. 17 shows a seventeenth embodiment in which the vertical arrangement of the floats 12 and the sub-floats 22 is replaced by a horizontal arrangement. The other configurations and operation modes are the same as those of the fifteenth embodiment, and thus the detailed description is omitted.

FIG. 18 shows an example of a novel pipeline system incorporating the valve device of the present invention applied to upland irrigation. Among the specific mechanisms, the common parts with the pipeline system of the prior art illustrated in Fig. 19 are a water supply unit consisting of water supply pumps 51, a storage tank 52, a mixing device 53, etc. A gas mixing unit consisting of a compressor 56, a pressure tank 57, etc., and a liquid / air switching unit consisting of an on-off valve 54, 58; a check valve 55, 59, etc. And the sprayer B at each terminal of the pipe 71. On the other hand, in the present invention, an on-off valve 60 for opening the atmosphere is provided at a location near the air supply unit of the pipe 71, and a liquid-opening and closing valve of the prior art is provided at the inlet side of each sprayer B. The difference from the prior art is that a valve device A 'of the present invention is interposed in place of the valve A.

In the pipeline system according to the present invention, the on-off valves 54 and 58 for switching the liquid supply and the air supply and the on-off valve 60 for opening the atmosphere are provided intensively at the supply source of the liquid supply and the air supply. By operation and control, the valve devices A, at each end of the pipeline 71 automatically respond, so that a series of operations that lead to the complete distribution of the liquid feed and the residual liquid are performed at the supply source. It can be controlled only. The water supply unit, chemical mixture unit, air supply unit, etc. are naturally included in the operation and control targets, but the detailed description is omitted because the method is well known.

The operation procedure of the pipeline system of the present invention will be described by taking, as an example, a case in which the valve device of the fifteenth embodiment is attached to the inlet side of the sprayer B and the chemical solution is sprayed in the upland irrigation. The operating conditions in the case of the valve device according to the fifth embodiment will be described below. This indicates the operating status in the case of the valve device of the embodiment or the like. )

Initial condition (Valve c is closed, Secondary valve port e is open, Auxiliary valve port h is open.) — Spraying liquid (Exhaust liquid from the secondary valve port e. After liquid flow, valve port c is opened. Secondary valve port e is closed, auxiliary valve port h is open.)

—Stop feeding liquid (valve port c is opened by residual liquid, sub-valve port e is closed, auxiliary valve port h is open) —Complete spray of residual liquid by air supply (drain from valve port c. Valve after draining) (Port c is closed, secondary valve port e is closed, auxiliary valve port h is closed.)

—Air supply stop (Valve c closed, Secondary valve port e closed, Auxiliary valve port h closed.) —Air release valve opened (Valve c closed, Secondary valve port e opened, Auxiliary valve port h Is open.) —Close the air release valve (valve port c is closed, auxiliary valve port e is open, auxiliary valve port h is open, that is, the original ^! Dog state is restored.)

Tona

When spraying water, the same procedure may be repeated. By doing so, not only can the waste of the chemical solution be prevented, but also the water and the chemical solution can be clearly separated and sprayed, so that the adverse effects of mixing of the water and the chemical residue in the pipeline (both are mixed) Therefore, the effect can be prevented from being weakened, or one can wash out the other, etc.), which is extremely useful. Note that the above operation procedure is an example, and it is needless to say that it is not necessary to limit to this procedure.

In the valve device A at the line terminal, a series of operations are all performed automatically, so it is sufficient for the driver to operate at the supply source of liquid supply and air supply. That is, neither direct operation nor remote operation is required for the valve device A and the sprayer B of the pipeline terminal, and therefore no control pipeline and no control wiring are required for it, which is easy and economical. This is a very convenient pipeline system that allows centralized control.

Each of the on-off valves 54, 58, 60 can be automated by providing an actuator or the like instead of manual operation. In addition, the operation procedures such as liquid supply and air supply are automatically controlled by a controller 61 that performs timer control and sequence control. Can be fully automated.

Depending on the conditions of use, automatic adjustment valves for flow and pressure, exhaust valves, safety valves, check valves, strainers, various instruments and control devices may be provided in the middle of the pipeline. In addition, use of an engine as power for the water supply unit or air supply unit, or connection to the power of a vehicle such as an automobile or a tractor, or loading and transporting the entire unit on a vehicle Therefore, it is possible to perform a driving operation in a place where there is no power supply.

Next, technical matters common to the embodiments will be described.

'The type of each of the floats 12 and 22 may be a conventionally known hollow type or solid type, and the shape, size, material and the like of these floats may be appropriately designed. Also, in each of the drawings, a structure in which the float and the valve body are integrated or directly connected and linked is illustrated. However, it is needless to say that the float and the valve body may be connected via an arm. . In order to prevent inaccurate operation of movable parts such as these floats due to the dynamic pressure of the liquid or gas flowing from the inlet flow path a, these floats may be formed in a shape with low fluid resistance, A guide channel, a deflector and the like may be provided as appropriate from the inlet channel a to each of the float chambers b and d. Also, a strainer may be appropriately provided in each flow path, or a mechanism for preventing the liquid from dropping off due to a siphon phenomenon at the time of stopping the liquid supply or various adjustment valves may be provided. . For each valve element 13; 23; 47, each figure shows a lift valve type, but other types of on-off valves (for example, notch valves, gate valves, ball valves, etc.) It is also possible to apply the following. In that case, a link mechanism with the float may be appropriately provided. In addition, depending on the operating conditions, a separate braking means (damper) may be additionally provided to more reliably prevent chattering, hunting, water hammer, etc. of the valve body, and also serves to prevent cavitation and the like. Conventional techniques such as providing comb-shaped, saw-tooth-shaped projections and rectifying grids on these valve bodies and corresponding valve seats, and making the shape of their abutting surfaces into a cone-shaped or curved surface, etc. May be.

The urging member used in the throttling means 31 and the urging means 43 is not limited to a compression spring or a tension spring, and may be any other type of spring or elastic member as long as it has the same function. Or may be linked to the weight. The mounting position does not need to be limited to the illustrated position.

Regarding the sealing member to be installed at the place where sealing is required, such as the sealing part of the pressure receiving plate 41 and the closed part of each valve port c; e; A ring, a diaphragm, a bellows, or the like may be applied, or other elastic members may be attached. If good sealing can be maintained by direct contact, the sealing member may be omitted.

The valve device of the present invention may be installed in the middle of a pipe, may be installed at the end of a pipe and used for discharge, or may be formed integrally with a sprayer. Sprinklers, perforated pipes, nozzles, etc. may be attached as sprayers. In particular, when spraying is performed uniformly over a wide range, an automatic sprinkler device that automatically changes the injection direction is installed. Alternatively, a plurality of sprinkler devices having different injection directions may be provided, or a device for automatically moving the injection position (such as an automatic elevating sprinkler device) may be provided.

In each of the above embodiments, each float or valve element mechanically senses the state in the flow path, such as the liquid level or pressure, and operates mechanically. It is of course conceivable to perform the operation via an electric signal (for example, by detecting an electric sensor and electrically driving each valve). Also, regarding the components of the valve device and the pipe system of the present invention, the materials of the components, the manufacturing method (integral molding, split molding, forging, cutting, etc.), combinations, arrangement relations, mounting positions, etc. In addition to the illustrated examples, various design changes can be made within the scope of the present invention, and the present invention is not limited to the above embodiments. Although the application of the present invention has been described as a typical application example of upland irrigation, it is also applicable to industrial, household and other fields. The present invention is not limited to the above application examples. Industrial applicability

The present invention thus has a simple and rational structure that is easy to design, manufacture, and maintain, is compact, inexpensive, and cuts off the pipeline when gas is allowed to pass after passing through a liquid. A valve device that automatically and reliably controls opening and closing, has good airtightness when the valve is closed, has stable operation, and is unlikely to cause chattering, hunting, water hammer, etc. just before the valve closes or at the moment when it starts to open It is a thing. In addition, at the start of or during liquid feeding, residual gas in the pipeline is automatically exhausted, and the operation can be fully automated over the entire process. Furthermore, a pipe system that can be easily and economically controlled automatically using this valve device has been obtained. Therefore, the present invention has a remarkable effect.

Claims

The scope of the claims

1. A valve that opens when the float rises and closes when the float descends, and a valve that closes when an action force due to a pressure in the flow passage of a predetermined value or more is applied and opens when the addition is released. A valve device comprising a valve.

2. Floater ^s is provided on the inlet side of the valve port provided between the inlet flow path and the outlet flow path of the valve box so as to be able to ascend and descend. A valve configured to open the valve port and to close the valve port when the float is lowered, and to close when an action force due to the pressure in the inlet channel that is equal to or more than a predetermined value is applied; And a sub-valve configured to open when the pressure is released and to communicate the inlet flow path with the outlet flow path or the outside of the flow path system.

3. With respect to the sub-valve, a sub-float is provided on the inlet side with respect to the sub-valve port so as to be movable up and down, and the sub-valve interlocks with the sub-float to close the sub-valve port when the sub-float rises. 3. The valve device according to claim 1, wherein the valve device is configured to perform the following operations.

4. The valve device according to claim 1 or 2, wherein the valve and the sub-valve are formed integrally.

5. A balance means for receiving a pressure of the fluid in a direction opposite to a direction in which the pressure of the fluid acts on the valve, and canceling at least a part of an acting pressure of the fluid related to the valve body. The valve device according to any one of claims 1 to 4.

6. An auxiliary valve is interposed between the inlet flow path and the outlet flow path of the valve, and the auxiliary valve is

-Any one of claims 1 to 5, characterized in that it is configured to close when a pressure difference before and after the pressure exceeds a predetermined value and to open when the pressure difference is released. The valve device as described.

7. The method according to claim 1, wherein a throttle means is provided in the fluid passage. Item 7. The valve device according to any one of Items 1 to 6.

8. The valve device according to any one of claims 1 to 7, wherein a mechanism for spraying the liquid is provided on the outlet side.

9. After the liquid has been fed through the pipeline to at least one terminal device, a gas is injected into the pipeline, thereby removing the residual liquid in the pipeline. A pipe system, characterized in that the valve device according to any one of claims 1 to 8 is interposed on an inlet side of the terminal device.

10. The pipeline system according to claim 9, wherein an on-off valve for opening to the atmosphere is provided in the pipeline.

11. Characteristically, at least one of the operation operations from the start and stop of liquid supply and the start and stop of gas injection to the return to the state before the start of liquid supply is automatically controlled. 10. The pipeline system according to claim 9 or 10.