JP2007100842A - Automatic water supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic water supply device with a selector valve which maintains high sealing performance in a condition where a transmission flow path is switched by the selector valve and which has little influence of fluid resistance on the transmission flow path. <P>SOLUTION: A rotary valve element 22 as part of the selector valve 19 has slide contact with a first flat surface 33 of a valve body 20 via a seal packing 32 and a sliding member 21. In this case, strip grooves 42, 43 are formed in a second flat surface 38 of the rotary valve element 22 to encircle groove flow paths 39, 40, respectively. Seal rings 44, 45 are fitted into the strip grooves 42, 43, respectively. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an automatic water supply device for irrigating a field or the like, and more specifically, maintains a high sealing performance of a switching valve in a state where the transmission channel is switched by the switching valve, and fluid resistance to the transmission channel. The present invention relates to an automatic water supply apparatus having a change-over valve that is less affected by.

  Conventionally, various automatic water supply devices have been used to irrigate fields, etc., and a water supply device that supplies irrigation water, a sensor device that takes in water level information, and a water supply device that opens and closes automatically. Some switching devices change control methods such as manual opening and closing. Some of these water supply devices use the fluid pressure of the inflowing fluid to drive the opening and closing of the water supply device, and the switching of the fluid pressure transmission path is performed by a switching valve that is a switching device, thereby driving the opening and closing of the water supply device. There is one that can select an automatic control state that automatically opens and closes according to the water level in conjunction with the sensor device, a manual closed state, and a manual open state. At this time, if the operation of the switching valve is uncertain, the operation of the water supply device is also uncertain, so the switching valve used in the automatic water supply device has a smooth switching of the transmission path and high sealing performance in each control state. It was sought after.

  Conventional switching valves include multi-way valves as shown in FIGS. 9 and 10 (see, for example, Patent Document 1). This configuration includes a casing 102 provided with a large number of ports 101, a spacer 103 that is fixedly disposed on the inner bottom surface of the casing 102, a fixed disk 104 that is stacked on the spacer 103, and a fixed disk 104. A multi-way valve that switches the communication flow path for each stop phase of the rotary disk 105, and is in close contact with the inner bottom surface of the casing 102, and the switching flow between the casing 102 and the spacer 103. A lower surface side packing 106 that seals the passage 107 is provided on the lower surface of the spacer 103, and an upper surface side packing 108 that closely contacts the lower surface of the fixed disk 105 and seals the switching flow path 107 between the fixed disk 105 and the spacer 103. It was the structure provided in the upper surface. The sealing of the multi-way valve at this time is performed by the upper surface side packing 108 and the lower surface side packing 106, and the upper surface side packing 108 and the lower surface side packing 106 are integrally formed. For example, the lower surface side packing 106 is shown in FIG. Such a shape is formed so as to surround the opening of each switching channel 107 and is attached to a packing groove 109 provided on the lower surface of the spacer 103. The effect is that the spacer 103 is disposed between the fixed disk 105 and the casing 102 to simplify the planar shape or the planar arrangement of the packing that holds the disk sealing surface, thereby reducing the sliding torque generated on the rotating disk 105. It was something that could be made.

  However, in the conventional multi-way valve packing, when the cross-sectional shape is square, the packing is likely to be deformed, so that stable sealing performance may not be maintained. There is a problem that the area becomes large and the effect of reducing the sliding torque cannot be obtained so much. In addition, when the cross-sectional shape is circular, the packing is formed so as to surround the opening of each switching channel 107, and therefore the lower surface side packing 106 (the same applies to the upper surface side packing 108). In the portion 110, since the seal area is extremely small at the base, the sealing performance of the branch portion 110 is lower than other portions, and there is a possibility that water leakage may occur. Further, when the lower surface side packing 106 is deformed due to fluid pressure or the like, stress is applied to the portion of the branching portion 110 to cause distortion and the sealing performance is further deteriorated. Therefore, the lower surface side packing 106 is particularly used as a sliding surface seal. When used, there is a problem that the lower surface packing 106 is deformed by sliding and water leakage occurs.

  As a solution to this problem, there is a rotary valve as shown in FIG. 11 (see, for example, Patent Document 2). In this configuration, the first valve half body 111 and the second valve half body 112 are arranged side by side so as to be relatively rotatable in a state where the first valve half body 111 and the second valve half body 112 are slidably facing each other. , 118 having one end at each end, and the other ends of the channels 114, 117 are opened on the flat surface, and the flow paths 114, 117 are formed by relative rotation of both valve halves 111, 112. Further, a groove 115 surrounding the open end of the flow path 117 is formed on the flat surface of the one valve half 112, and the groove 115 slides on the flat surface of the other valve half 111. The seal ring 116 which can be contacted was fitted. At this time, the first valve half body 111 is provided with a port 113 communicating with the flow path 114 opened on the flat surface and communicating with the outside, and the second valve half body 112 has a flow path opened on the flat surface. A port 118 that communicates with 117 and communicates with the outside is provided on the upper surface. The effect is that an unnecessary deformation force is not applied to the seal ring 116, and the seal ring 116 is slidably contacted with the flat surface of the other valve half 111 with an even adhesion force, thereby improving the airtightness of the seal ring 116. It was to be done.

Japanese Patent Laid-Open No. 2004-76869 Japanese Unexamined Patent Publication No. Heisei 2-203086

  However, the conventional rotary valve is provided with ports 113 and 118 in each of the first valve half 111 and the second valve half 112, and the first valve half 111 and the second valve half 112 are different from each other. Since the first valve half 111 is fixed and the second valve half 112 is rotated, the flow paths 114 and 117 are switched, so that the second valve half 112 is rotated. A pipe leading to the outside is connected to the provided port 118 (not shown), and this moves according to the rotation of the second valve half 112, so that the pipe connected to the port 118 is connected to the second valve half. The second valve half 112 cannot be rotated unless it is formed so as to move in accordance with the rotation of the body 112, and the connected piping is not rotated. Or a problem that hinders the connecting portion of the pipe by rotation of the second valve half 112 has a problem that there is a risk that water leakage from the connection portion easily loosened occurs. In addition, since the conventional rotary valve is not assumed to be used in an automatic water supply apparatus, the configuration of the ports 113 and 118 to which the pipes are connected and the transmission flow path thereof are suitable for switching the transmission flow path in the automatic water supply apparatus. There was a problem that it cannot be used as it is for the automatic water supply apparatus. The seal ring 116 fitted into the groove 115 is usually a circular shape such as an O-ring. On the other hand, the shape of the groove 115 is an elliptical shape due to the structure for switching the fluid, or the ellipse is bent. Therefore, in order to fit a circular seal ring, the seal ring 116 tries to be restored to a circular shape, making it difficult to assemble, and the circular seal ring 116 has an elliptical shape or a shape obtained by bending the elliptical shape. If the groove 115 is fitted into the groove 115, an extra stress is applied to the seal ring 116, which causes a problem that the seal ring 116 is easily deformed or damaged.

  The present invention has been made to solve the above-described problems, and maintains a high sealing performance of the switching valve in a state where the transmission flow path is switched by the switching valve, and is less affected by fluid resistance in the transmission flow path. An object of the present invention is to provide an automatic water supply apparatus having a switching valve.

  The configuration of the present invention made to solve the above problems will be described with reference to the drawings. A plurality of openings 34, 35, 36, and 37 communicating with the plurality of water inlets 24, 26, 28, and 30 are respectively first. The second flat surface 38 includes a valve body 20 provided on one flat surface 33, a groove flow path 39, 40 that communicates at least two openings 34, 35, 36, 37 and an air communication portion 41 that communicates with the air. The first flat surface 33 of the valve body 20 and the second flat surface 38 of the rotary valve body 22 are in sliding contact with each other, and the rotary valve body 22 is rotatably provided. The switching valve 19, the water level sensor 60 that senses fluctuations in the water level, and the flow of the fluid is changed by switching the switching valve 19, thereby manually opening and closing the valve and automatically opening and closing the valve that is driven according to the operation of the water level sensor 60. Automatic water supply apparatus comprising a main body 1 In this case, grooves 42 and 43 surrounding the groove flow paths 39 and 40 are formed on the second flat surface 38 of the rotary valve body 22 constituting the switching valve 19, respectively, and the first flat surface 33 is formed on the grooves 42 and 43. The first feature is that seal rings 44 and 45 slidably contactable with each other are fitted.

  Further, the switching valve 19 provided in the automatic water supply device includes a first water inlet 24, a second water inlet 26 and a third water inlet 28 on a side surface, and a fourth water inlet 30 on a side surface or a lower surface, The first flat surface 33, the first opening 34 communicating with the first water inlet 24, the second opening 35 communicating with the second water inlet 26, the third opening 36 communicating with the third water inlet 28, the first In the valve body 20 in which the fourth opening 37 communicating with the four water inlets 30 is opened on the same circumferential line, and the automatic water supply device is in the automatic opening / closing state, the first opening 34 and the second opening are formed on the second flat surface 38. A first groove channel 39 having a shape of an ellipse curved in communication with the two openings 35 is provided along the circumferential line, and communicated with the third opening 36 and the fourth opening 37 to bend the ellipse. A second groove channel 40 having a shape is provided along the circumferential line, and in the atmosphere opening hole 71 provided on the side surface. A rotary valve body 22 having an air communication portion 41 therethrough, and a switching knob 23 fixed to the upper portion of the rotary valve body 22 so that the rotary valve body 22 and the knob portion 46 rotate together. Is the second feature.

  Further, the valve body 20 of the switching valve 19 has openings 34a, 35a, 36a, 37a communicating with the openings 34, 35, 36, 37 formed in the first flat surface 33, and the rotary valve A third feature is that the sliding member 21 that is in sliding contact with the second flat surface 38 of the body 22 is fixed.

  The fourth feature is that the seal rings 44 and 45 fitted into the grooves 42 and 43 surrounding the groove channels 39 and 40 are formed in substantially the same shape as the grooves 42 and 43, respectively. To do.

  Further, the automatic water supply device is positioned opposite to the inlet channel 3 and the opening 6 of the inlet channel 3 and holds the valve body 11 held by the diaphragm 12 or the piston, the diaphragm 12 or the piston, and the diaphragm 12. Or the bonnet 14 which has the communication hole 31 which forms the primary pressure chamber 18 in the upper part of the piston and communicates with the primary pressure chamber 18 and the fourth water inlet 30 of the switching valve 19 and the inlet flow located on the upstream side of the opening 6. A first water conduit 25 that opens at one end of the passage 3 and communicates the other end with the first water conduit 24 of the switching valve 19, a second water conduit 27 and a third conduit that communicates with the second water inlet 26 of the switching valve 19. The second conduit 27 and the third conduit 29 are opened to the atmosphere when the valve is opened, and the second conduit 27 and the third conduit are closed when the valve is closed. 29 open air An air release valve 66 that is turned off, and a water level sensor 60 that closes the air release valve 66 at the upper limit water level of the controlled water and opens the air release valve 66 at the lower limit water level in conjunction with fluctuations in the controlled water level. This is the fifth feature.

  In the automatic water supply apparatus of the present invention, the switching valve 19 is formed with grooves 42 and 43 surrounding the groove flow paths 39 and 40 on the second flat surface 38 of the rotary valve body 22, respectively. Since the seal rings 44 and 45 that can be brought into sliding contact with the first flat surface 33 of the main body 20 are fitted, the seal rings 44 and 45 do not have a branching portion, and the entire circumference of the groove grooves 42 and 43 is the first. Since the flat surface 33 can be contacted uniformly, the sealing performance of the switching valve 19 can be maintained higher than that of the conventional product. The seal rings 44 and 45 preferably have a circular cross section. Since the seal rings 44 and 45 are used in sliding portions, the seal rings 44 and 45 have a linear contact with the first flat surface 33 if they are circular. It is preferable because torque is reduced, the seal rings 44 and 45 are not easily deformed by sliding, and a high sealing performance is obtained even when the fluid pressure is high, and a high sealing performance is maintained for a long period of time. The relationship between the groove depth of the grooves 42 and 43 and the seal rings 44 and 45 may be set in the same manner as in the case of the O-ring as long as the cross section is circular.

  The sliding contact in the present invention is not limited to only between the first flat surface 33 of the valve body 20 and the second flat surface 38 of the rotary valve body 22, and has the same shape as the first flat surface 33 therebetween. The sliding member 21 is interposed, and sliding contact between the sliding member 21 and the second flat surface 38 is also included.

  The switching valve 19 of the automatic water supply apparatus of the present invention includes a first water inlet 24, a second water inlet 26, and a third water inlet 28 on a side surface of the valve body 20, and a fourth water inlet 30 on a side surface or a lower surface. That is, the point is that the rotary valve body 22 is not provided with a water inlet. By forming in this way, since the water conduit connected to the water inlet is connected to the valve body 20 that does not rotate, the water conduit does not prevent the rotation valve body 22 from rotating or obstructs rotation. Rotation of the rotary valve body 22 does not cause looseness at the connecting portion of the water conduit and water leakage does not occur.

  In the present invention, the first flat surface 33 of the valve body 20 is connected to the first opening 34 communicating with the first water inlet 24, the second opening 35 communicating with the second water inlet 26, and the third water inlet 28. The second flat surface of the rotary valve body 22 is formed when the third opening 36 that communicates with the fourth opening 37 that communicates with the fourth water inlet 30 is opened on the same circumferential line, and the automatic water supply device is in the automatic opening / closing state. 38 is provided with a first groove channel 39 which is communicated with the first opening 34 and the second opening 35 and has a curved ellipse shape along the circumferential line, and the third opening 36 and the fourth opening. The second groove channel 40 having a curved shape that communicates with the ellipse 37 is provided along the circumferential line, and the atmosphere communication portion 41 that communicates with the atmosphere opening hole 71 provided on the side surface is provided. Therefore, the automatic water supply device can be operated in the automatic opening / closing mode. Moreover, since each opening part 34,35,36,37, the groove flow paths 39 and 40, and the air | atmosphere communication part 41 are formed on the same circumference line, when the rotary valve body 22 of the switching valve 19 is rotated, Each opening 34, 35, 36, 37, each groove channel 39, 40, and the communication channel of the atmosphere communication unit 41 can be switched. This is an automatic water supply device in an automatic open / close mode, a manual close mode, and a manual It is possible to switch between the open mode and the automatic water supply device smoothly in each mode.

  The switching valve 19 of the present invention is a sliding member provided with openings 34a, 35a, 36a, 37a communicating with the openings 34, 35, 36, 37 provided on the first flat surface 33 of the valve body 20. 21 may be configured to be fixed to the valve body 20 (see FIG. 4). As described above, when the sliding member 21 is not provided, the number of components is reduced, which is preferable. When the sliding member 21 is provided, the surface roughness of the sliding member 21 is reduced by secondary processing. At the same time, it is easy to process when obtaining a good smoothness, the processing time can be reduced, and the sliding member 21 is formed of a member having a low friction coefficient and good sliding characteristics, so This is preferable because the slidability of the moving member 21 can be improved. The material of the sliding member 21 is not particularly limited as long as it has a low friction coefficient and good sliding characteristics. Polyvinylidene fluoride (hereinafter referred to as PVDF), polytetrafluoroethylene (hereinafter referred to as PTFE). ), Tetrafluoroethylene / perfluoroalkyl vinyl ether copolymers (hereinafter referred to as PFA), fluororesins such as PCTFE, polypropylene (hereinafter referred to as PP), polyethylene (hereinafter referred to as PE), high density polyethylene Suitable examples include olefin-based resins such as polyacetal (hereinafter referred to as POM) and polystyrene (hereinafter referred to as PS).

  The first groove flow path 39 and the second groove flow path 40 of the rotary valve body 22 in the present invention are provided in a curved shape of an ellipse, so that the fluid flowing in from the openings 34, 35, 36, and 37 is smooth. This is preferable because it can flow, reduce fluid resistance, and prevent fluid retention.

  The seal rings 44 and 45 fitted into the grooves 42 and 43 surrounding the groove flow paths 39 and 40 of the rotary valve body 22 are preferably formed in substantially the same shape as the grooves 42 and 43. This is because when the seal rings 44 and 45 are fitted into the grooves 42 and 43, the seal rings 44 and 45 can be fitted with almost no deformation, so that the assembly becomes easy and the stress applied to the seal rings 44 and 45 is increased. It is possible to reduce the deformation of the seal rings 44 and 45 and to extend the life of the seal rings 44 and 45.

  The water level sensor 60 used in the automatic water supply apparatus of the present invention is not particularly limited as long as it is configured to be able to sense the water level of the fluid and to open and close the atmosphere release valve 66 according to the sensed water level. Alternatively, a method of detecting the water level by contact with a laser, a switch, water, or the like, or a structure in which a float 62 is provided and mechanically driven according to the height of the water level may be used. In particular, if the water level sensor 60 is driven according to the height of the float 62 using the float 62 as in the present invention, it is necessary to prepare power such as electricity separately for driving the water level sensor 60. In addition, the simple configuration is preferable because malfunctions and failures are unlikely to occur.

  In the embodiment of the present invention, the valve body 11 has a structure connected to the diaphragm 12. However, the present invention is not limited thereto, and the valve body 11 is connected to the piston, and the primary pressure chamber 18 is formed in the cylinder that houses the piston. It is good also as a structure to do. Moreover, in this embodiment, although the main body 1 is formed in the angle valve type | mold, you may comprise in the type which water-feeds radially around the valve seat 7 like the conventional automatic water supply apparatus, and is specifically limited. It is not a thing.

  Further, in the embodiment of the present invention, one end of the first conduit pipe 25 is configured to open to the inlet flow path 3 via the filter element 54. However, when the controlled water does not include dust, foreign matter, or the like. There is no need to provide the filter element 54, and one end of the first water conduit 25 may be provided so as to open directly to the inlet channel 3.

  The material of the main body 1 of the present invention, the valve main body 20 of the switching valve 19 and the rotary valve body 22 is not particularly limited as long as it has the necessary physical strength. Vinyl chloride resin, ABS resin, POM, PS, olefin type Thermoplastic resins such as resins (PP, PE), fluororesins (PVDF, PTFE, PFA, PCTFE), phenol resins, urea resins, epoxy resins, unsaturated polyester resins, cast iron, carbon steel And metals such as iron alloy, copper alloy, aluminum alloy, and magnesium alloy.

  The material of the seal rings 44 and 45 is not particularly limited as long as it is generally used as a seal material, but preferably has a low compression set as a mechanical property, such as an ethylene / propylene / butadiene copolymer, fluorine Based elastomers and the like.

The automatic water supply apparatus of the present invention configured as described above has the following special effects.
(1) A groove that surrounds the groove flow path is formed on the second flat surface of the rotary valve body of the switching valve of the automatic water supply apparatus, and a seal ring that can slide in contact with the first flat surface is fitted into the groove. Thereby, the automatic water supply apparatus which maintained the high sealing performance of the switching valve can be obtained.
(2) The valve body of the switching valve includes a first water inlet, a second water inlet, a third water inlet, and a fourth water inlet, and a first opening that communicates with each water inlet on the first flat surface, When the two openings, the third opening, and the fourth opening are opened on the same circumferential line, and the automatic water supply device is in the automatic opening / closing state, the first opening and the second opening are formed on the second flat surface of the rotary valve body. A first groove channel communicating with the opening, a second groove channel communicating with the third opening and the fourth opening, and an air communication portion communicating with the air opening hole provided on the side surface are provided. Thus, the transmission flow path of the automatic water supply apparatus can be switched to the automatic open / close mode, the manual close mode, and the manual open mode, and the automatic water supply apparatus can be smoothly operated in each mode.
(3) By making the groove flow path of the switching valve into an elliptical shape, the fluid flowing in from each opening can flow smoothly, reducing fluid resistance and preventing fluid retention. .
(4) Since the seal ring fitted in the groove surrounding the groove flow path of the switching valve is formed in substantially the same shape as the groove, the seal ring can be fitted with almost no deformation. The stress applied to the seal ring can be reduced, and the life of the seal ring can be extended.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings, but it goes without saying that the present invention is not limited to these embodiments.

  1 is a longitudinal sectional view showing an automatic water supply apparatus according to the present invention, FIG. 2 is an exploded perspective view showing a switching valve of FIG. 1, and FIG. 3 shows an embodiment of a valve body with a sliding member fixed thereto. FIG. 4 is an exploded perspective view showing an embodiment of a valve body in a state where a sliding member is fixed, FIG. 5 is a bottom view showing an embodiment of a rotary valve body, and FIG. FIG. 7 is an explanatory diagram schematically showing a state in which the switching valve is in the “manual closing mode”, and FIG. 8 is a state in which the switching valve is in the “manual opening mode”. It is explanatory drawing which shows this typically.

  1 to 5, reference numeral 1 denotes an angle valve type main body, which has an inlet channel 3 and an outlet channel 4 partitioned by a partition wall 2 provided therein, and is located between the two channels. And a valve chamber 5 arranged to communicate with the inlet channel 3. The partition wall 2 is provided with an opening 6 for communicating the inlet channel 3 and the valve chamber 5, and the partition wall 2 around the opening 6 on the valve chamber 5 side is provided with a valve seat 7. Furthermore, an L-shaped joint 8 is rotatably mounted on the outlet channel 4 by screwing a cap nut 10 onto the main body 1 via a stopper 9. Reference numeral 11 denotes a valve body, which is opposed to the opening 6 and is fixed to a lower end portion of the valve shaft 13 held by the diaphragm 12 with a nut or the like so as to be movable up and down in the valve chamber 5. 14 is a bonnet, and the diaphragm 12 is clamped and fixed to the flange portion 16 at the upper part of the main body 1 via a support 15 that is located above the valve chamber 5 and holds the valve shaft 13. A stroke limiter 17 slidably holding 13 is penetrated and screwed, and a primary pressure chamber 18 is formed between the diaphragm 12 and the diaphragm 12.

  Reference numeral 19 denotes a switching valve that switches the automatic water supply apparatus to an automatic operation mode, a manual close mode, or a manual open mode by switching the flow of fluid. The switching valve 19 is formed of a valve body 20, a sliding member 21, a rotary valve body 22, and a switching knob 23, each of which has the following configuration.

  Reference numeral 20 denotes a valve body having a plurality of water inlets. On the side surface of the valve body 20, a first water inlet 24 communicated with a filter element 54, which will be described later, via a first water conduit 25, and a second, which is communicated with an atmosphere release valve 66, described later, via a second water conduit 27. A water inlet 26 and a third water inlet 28 communicated via a third water conduit 29 are provided. A fourth water inlet 30 is provided on the lower surface of the valve body 20, and the fourth water inlet 30 communicates with a communication hole 31 that communicates with the primary pressure chamber 18 formed in the bonnet 14. A sliding member 21, which will be described later, is formed on the upper part of the valve main body 20 with seal packings 32 formed therein with openings that communicate with the water inlets.

  Reference numeral 21 denotes a sliding member fixed to the valve body 20. A flat surface 72 is formed on the upper surface of the sliding member 21, and the flat surface 72 has openings 34 a communicating with the openings 34, 35, 36, and 37 provided in the first flat surface 33 of the valve body 20. , 35a, 36a, and 37a are located on the same circumference line. The opening 37a is opened at a position that is axially symmetric with the opening 35a on the same circumference.

  Reference numeral 22 denotes a rotary valve body. The lower surface of the rotary valve body 22 is a second flat surface 38 that is in sliding contact with the flat surface 72 of the sliding member 21, and the second flat surface 38 has an angular width of 120 ° in the circumferential direction. A first groove channel 39 having an elliptical shape along the circumference, a second groove channel 40 having an elliptical shape along the circumferential line at an angular width of 60 ° in the circumferential direction, and a rotary valve An atmosphere communicating portion 41 communicating with the atmosphere opening hole 71 provided on the side surface of the body 22 is provided so as to be positioned on the circumferential line. The groove channels 39, 40 communicate with the opening 34a and the opening 35a when the automatic water supply device is in an automatic open / close state, and the second groove channel 40 includes the opening 36a and the opening 37a. (See FIG. 6). In addition, a groove 42 surrounding the first groove channel 39 and a groove 43 surrounding the second groove channel 40 are formed on the second flat surface 38, respectively. The groove 42 is substantially the same as the groove 42. A seal ring 44 formed in a shape is fitted, and a seal ring 45 formed in substantially the same shape as the groove 43 is fitted in the groove 43.

  Reference numeral 23 denotes a switching knob. A knob portion 46 is provided on the upper portion of the switching knob 23, and a convex portion 48 that is fitted in a concave portion 47 provided on the upper portion of the rotary valve body 22 is provided. When the knob portion 46 is rotated, a rotary valve is provided. The body 22 is fixed so as to co-rotate.

  In the switching valve 19 described above, first, the sliding member 21 is fixed to the valve body 20 so as not to rotate, and the rotary valve body 22 slides on the flat surface 72 and the second flat surface 38 of the sliding member 21. It is installed so as to be rotatable, and then formed by fixing the switching knob 23 to the rotary valve body 22 so as to rotate together. This switching valve 19 has a switching function of an automatic operation mode, a manual closing mode, and a manual opening mode.

  Reference numeral 49 denotes a cylindrical air vent valve mounted on the bonnet, which has an air inlet 50 at the lower portion and an air outlet 51 at the upper portion, and a cylindrical floating valve body having a specific gravity smaller than that of water therein. 52 is arranged. The air inlet 50 is communicated with the inside of the primary pressure chamber 18 through a communication hole 53 provided in the bonnet 14. As can be seen from FIG. 1, the inner upper surface of the bonnet 14 forming the primary pressure chamber 18 is inclined upward toward the communication hole 53 that communicates with the air vent valve 49. When the upper surface is inclined as described above, the air mixed in the bonnet 14 moves to the air vent valve 49 along the inclined upper surface of the bonnet 14 and is reliably exhausted. As a result, an effect of preventing malfunction caused by the air in the primary pressure chamber 18 flowing into the switching valve 19 can be obtained.

  Reference numeral 54 denotes a filter element, which is provided in the inlet channel 3 upstream of the opening 6 and includes an adapter 56 having a communication hole 55 for connecting the first conduit 25 and the inlet channel 3 therein, and an adapter A spring 57 that filters water through a gap between coils that are fitted and fixed to 56 and a cap 58 that closes an upstream opening of the spring 57, and is fixed to the main body 1 by a cap nut 59 via an adapter 56. Yes.

  One end of the first water conduit 25 is connected to a communication hole 55 provided in the adapter 56 and opens to the inlet channel 3, and the other end is connected to the communication hole 31 provided in the bonnet 14 and the fourth water inlet 30. It connects with the 1st water inlet 24 of the switching valve 19 made to be able to communicate through this.

  Reference numeral 60 denotes a water level sensor, which is engaged with a float 62 that is loosely fitted to the float guide 61, float stoppers 64 and 65 that are fixed to the float guide 61 positioned above and below the float 62, and an upper part of the float guide 61. A control valve 66 connected to the float guide 61 via the arm 63 (which is referred to as the “air release valve” in the present embodiment, since it is used as a control valve in the present embodiment) 66 is a main component. The float 62 is formed in a cylindrical shape with a material having a specific gravity smaller than that of water, and moves up and down along the float guide 61 according to the vertical movement of the water level. A float stopper 64 that defines an upper limit position of the float 62 and a float stopper 65 that defines a lower limit position are mounted on the float guide 61 so as to be movable and fixed by a thumbscrew or the like. When the interval between the float stoppers 64 and 65 is narrowed, the dead zone width of the water level becomes small. That is, the water level sensor 60 immediately follows the vertical movement of the water level and operates. On the other hand, when the interval is widened, the dead zone width becomes large, and it follows only a large water level fluctuation without following a minute water level fluctuation.

  The air release valve 66 has an inlet port 67 and an outlet port 68. The inlet port 67 is connected to the second conduit 27, the outlet port 68 is connected to the third conduit 29, the second conduit 27, the second conduit. The three water conduits 29 are connected to the switching valve 19, the second water inlet 26, and the third water inlet 28. An air release port 69 provided at the bottom of the air release valve 66 is configured to be opened and closed by a valve 70 engaged with the arm 63. When the valve 70 is open, the second conduit pipe is opened. 27, the water passing through the third water conduit 29 is opened to the atmosphere.

  Next, the operation of this embodiment will be described. In the present embodiment, the fourth water inlet 30 is provided on the lower surface of the switching valve 19, but the fourth water inlet 30 is a side surface in FIGS. 6, 7, and 8 for easy understanding of the switching state of the flow path. It is shown in a state in the state.

  FIG. 1 shows a case where the switching valve 19 is set to the automatic operation mode using the switching knob 23 (state shown in FIG. 6). In this state, the opening 34a communicating with the first opening 34 and the opening 35a communicating with the second opening 35 are communicated with each other through the first groove channel 39, and similarly, the opening 36a and the opening 37a are connected to the first opening 34a. The two-channel channel 40 communicates, and the atmosphere communication part 41 is not communicated with any opening. (Two groove channels 39 and 40 are not formed in the sliding member 21, but are illustrated for easy understanding.) Accordingly, the opening 34a, the first groove channel from the first water inlet 24. 39, communicated with the second water inlet 26 through the opening 35a, and communicated with the fourth water inlet 30 from the third water inlet 28 through the opening 36a, the second groove channel 40, and the opening 37a. It has become.

  In FIG. 1, the water surface of the paddy field is lowered, the float 62 is lowered, and the air release valve 66 is open. In the figure, the water that has reached the inlet channel 3 flows out of the joint 8 through the opening 6, the valve chamber 5, and the outlet channel 4. On the other hand, a part of the water reaching the inlet channel 3 flows through the minute gap of the spring 57 of the filter element 54 and flows into the first water conduit 25 through the communication hole 55 of the adapter 56 and is filtered. 24 flows from the second water inlet 26 to the second water conduit 27 through the switching valve 19, flows from the inlet port 67 of the atmosphere release valve 66 into the atmosphere release valve 66, and is discharged from the atmosphere release port 69 to the outside. . Accordingly, the pressure P ′ in the primary pressure chamber 18 is extremely reduced and becomes smaller than the pressure P upstream of the opening 6, and the valve body 11 is pushed upward by the action of the pressure P, so that the opening 6 Is opened and the automatic water supply device is open.

  Next, when water is supplied to the paddy field and the float 62 reaches the upper limit position of the set water surface, the valve 70 of the atmosphere release valve 66 closes the atmosphere release port 69. At this time, the water flowing into the atmosphere release valve 66 from the inlet port 67 through the second water conduit 27 flows from the outlet port 68 to the third water conduit 29 and passes through the switching valve 19 from the third water inlet 28 to the fourth conduit. The water flows from the water port 30 to the primary pressure chamber 18 through the communication hole 31 provided in the bonnet 14. When the primary pressure chamber 18 is filled with water, the water passes through the communication hole 53 provided in the bonnet 14 and flows into the air vent valve 49. When water flows into the air vent valve 49, the floating valve body 52 rises due to buoyancy, and when the air vent valve 49 is filled with water, the floating valve body 52 seals the air discharge port 51 to Prevent water leakage. When air is mixed into the primary pressure chamber 18, the air moves along the upper surface of the bonnet 14 with the inclination to the communication hole 53 and passes through the air inlet 50 below the air vent valve 49. And is discharged from the air discharge port 51. As indicated by a broken line in the drawing, when the valve 70 in the atmosphere release valve 66 closes the atmosphere release port 69, the pressure P directly acts on the primary pressure chamber 18, and therefore P '= P. Since the effective pressure receiving area of the diaphragm 12 is much larger than the pressure receiving area of the valve body 11, the valve body 11 moves downward and is pressed against the valve seat 7, and the automatic water supply device is closed.

  Next, when the switching valve 19 is in the manual close mode (the state shown in FIG. 7), the opening 34a and the opening 37a are communicated with each other through the second groove channel 40, and the opening 35a is communicated with the first groove channel 39. In addition, the atmosphere communication part 41 is in communication with the opening 36a. Thus, the first water inlet 24 communicates with the fourth water inlet 30 through the opening 34a, the groove channel 40, and the opening 37a, and the opening 35a communicates with the first groove channel from the second water inlet 26. However, water does not flow, and the third opening 36 from the third water inlet 28 communicates with the atmosphere opening hole 71 via the atmosphere communicating portion 41, but water does not flow.

  At this time, a part of the water reaching the inlet channel 3 flows through the minute gap of the spring 57 of the filter element 54 and flows into the first water conduit 25 through the communication hole 55 of the filtered adapter 56. 24 flows from the fourth water inlet 30 to the primary pressure chamber 18 through the communication hole 31 provided in the bonnet 14 through the switching valve 19. Therefore, the automatic water supply device operates in the same manner as when the valve 70 of the atmosphere release valve 66 is closed, and the automatic water supply device is closed.

  Next, when the switching valve 19 is set to the manual opening mode in the state (closed state) shown by the broken line in FIG. 1 (state shown in FIG. 8), the opening 34a communicates with the second groove channel 40 and the opening 35a. And the opening 36a are communicated with each other through the first groove channel 39, and the opening 37a is communicated with the atmosphere communicating portion 41. Thus, the opening 37a from the fourth water inlet 30 communicates with the atmosphere opening hole 71 via the atmosphere communication portion 41 and is released to the atmosphere, and the opening 34a communicates with the second groove channel 40 from the first water inlet 24. However, water is closed at the second groove channel 40 and communicates from the second water inlet 26 to the third water inlet 28 via the opening 35a, the first groove channel 39, and the opening 36a. The water does not flow.

  At this time, a part of the water reaching the inlet channel 3 flows through the minute gap of the spring 57 of the filter element 54 and flows into the first conduit 25 through the communication hole 55 of the filtered adapter 56, and the first conduit The water flowing to 25 is blocked by the switching valve 19. In the switching valve 19, the communication hole 31 provided in the bonnet 14 communicates with the atmosphere opening hole 71 provided in the switching valve, and the water reaching the inlet flow path 3 pushes up the valve body 11, thereby causing the primary pressure chamber 18. The water filling the inside is discharged to the outside air, and the automatic water supply device is opened.

  By the above operation, the transmission path is changed by the switching valve 19 to switch between the automatic opening / closing mode, the manual closing mode, and the manual opening mode. Further, in the switching valve 19, grooves 42 and 43 surrounding the groove flow paths 39 and 40 are formed on the second flat surface 38 of the rotary valve body 22, and the flat surfaces 72 of the sliding member 21 are formed in the grooves 42 and 43. Since the seal rings 44 and 45 that can be slidably contacted with each other are formed and fitted in substantially the same shape as the groove grooves 42 and 43, high sealing performance can be maintained in a state where the transmission path is changed, Even if the flat surface 72 and the second flat surface 38 of the sliding member 21 are slid by switching the switching valve 19, the seal rings 44 and 45 are not deformed and maintain a good sealing performance over a long period of time. be able to.

It is a longitudinal cross-sectional view which shows the automatic water supply apparatus which concerns on this invention. It is a disassembled perspective view which shows the switching valve of FIG. It is a top view which shows one Embodiment of the valve main body of the state to which the sliding member was fixed. It is a disassembled perspective view which shows one Embodiment of the valve main body of the state to which the sliding member was fixed. It is a bottom view which shows one Embodiment of a rotary valve body. It is explanatory drawing which shows typically the state which made the switching valve into "automatic operation mode." It is explanatory drawing which shows typically the state which set the switching valve to the "manual close mode." It is explanatory drawing which shows typically the state which set the switching valve to the "manual open mode". It is a longitudinal cross-sectional view which shows the conventional multi-way valve. It is a bottom view which shows the spacer of the conventional multi-way valve. It is a longitudinal cross-sectional view which shows the conventional rotary valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Main body 2 ... Partition 3 ... Inlet channel 4 ... Outlet channel 5 ... Valve chamber 6 ... Opening 7 ... Valve seat 8 ... Joint 9 ... Stopper 10 ... Cap nut 11 ... Valve body 12 ... Diaphragm 13 ... Valve shaft 14 ... Bonnet 15 ... Support 16 ... Flange 17 ... Stroke limiter 18 ... Primary pressure chamber 19 ... Switching valve 20 ... Valve body 21 ... Sliding member 22 ... Rotary valve element 23 ... Switching knob 24 ... First water inlet 25 ... First Water conduit 26 ... Second water conduit 27 ... Second water conduit 28 ... Third water conduit 29 ... Third water conduit 30 ... Fourth water conduit 31 ... Communication hole 32 ... Seal packing 33 ... First flat surface 34 ... First Opening 34a ... Opening 35 ... Second opening 35a ... Opening 36 ... Third opening 36a ... Opening 37 ... Fourth opening 37a ... Opening 38 ... Second flat surface 39 ... First groove channel 40 ... second groove channel 41 ... atmospheric communication part 42 ... slot 43 ... strip 44 ... Luling 45 ... Seal ring 46 ... Knob portion 47 ... Concave portion 48 ... Convex portion 49 ... Air vent valve 50 ... Air inlet 51 ... Air exhaust port 52 ... Floating valve body 53 ... Communication hole 54 ... Filter element 55 ... Communication hole 56 ... Adapter 57 ... Spring 58 ... Cap 59 ... Cap nut 60 ... Water level sensor 61 ... Float guide 62 ... Float 63 ... Arm 64 ... Float stopper 65 ... Float stopper 66 ... Atmospheric release valve 67 ... Inlet port 68 ... Outlet port 69 ... Atmospheric release Port 70 ... Valve 71 ... Air release hole 72 ... Flat surface

Claims (5)

A valve body in which a plurality of openings each communicating with a plurality of water inlets are formed on a first flat surface, a groove channel that communicates at least two of the openings, and an atmosphere communication portion that communicates with the atmosphere are second flat. A switching valve having a rotary valve body formed on the surface, wherein the first flat surface of the valve body and the second flat surface of the rotary valve body are in sliding contact, and the rotary valve body is rotatably provided A water level sensor that senses fluctuations in the water level, and a body that manually opens and closes the valve and automatically opens and closes the valve that is driven in response to the operation of the water level sensor by changing the flow of the fluid by switching the switching valve. In the automatic water supply apparatus provided, a groove surrounding the groove flow path is formed on the second flat surface of the rotary valve body constituting the switching valve, and the groove can slide on the first flat surface. Automatic water supply device, characterized in that a suitable seal ring is fitted . The switching valve provided in the automatic water supply device includes a first water inlet, a second water inlet and a third water inlet on a side surface, and a fourth water inlet on a side surface or a lower surface, on a first flat surface, A first opening communicating with the first water inlet, a second opening communicating with the second water inlet, a third opening communicating with the third water inlet, and a fourth opening communicating with the fourth water inlet. When the valve body is opened on the same circumferential line and the automatic water supply device is in an automatic open / close state, the second flat surface has a shape in which an ellipse is bent in communication with the first opening and the second opening. The first groove channel is provided along the circumferential line, communicates with the third opening and the fourth opening, and the second groove channel shaped like an ellipse is formed along the circumferential line. A rotary valve body provided with an air communication portion that communicates with an air release hole provided on the side surface, and an upper portion of the rotary valve body , Automatic water supply device of claim 1, wherein the having a knob switch and said rotary valve member and the knob portion is fixed so as to co-rotate. The valve body of the switching valve has an opening communicating with the opening formed in the first flat surface, and a sliding member that is in sliding contact with the second flat surface of the rotary valve body is fixed. The automatic water supply apparatus according to claim 1 or claim 2, characterized by the above. The automatic water supply according to any one of claims 1 to 3, wherein a seal ring fitted into each groove surrounding the groove channel is formed in substantially the same shape as the groove. apparatus. The automatic water supply device is positioned opposite to the inlet channel and the opening of the inlet channel, and is held by the diaphragm or the piston, and holds the diaphragm or the piston and is primary on the upper part of the diaphragm or the piston. A pressure chamber is formed, a bonnet having a communication hole communicating with the primary pressure chamber and the fourth water inlet of the switching valve, and one end is opened to the inlet channel located upstream of the opening and the other end A valve interposed between a first water conduit communicating with the first water inlet of the switching valve, a second water conduit communicating with the second water inlet of the switching valve, and a third water conduit communicating with the third water inlet. When the valve is opened, the second conduit and the third conduit are opened to the atmosphere, and when the valve is closed, the atmosphere release valve that shuts off the atmosphere of the second conduit and the third conduit, and the water level fluctuation of the controlled water At the upper limit water level of the controlled water. Wherein closing the air release valve, also automatic water supply device according to any one of claims 2 to 4, characterized by comprising a water level sensor for opening the atmosphere release valve at the lower limit level.

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