JP2020018234A - Intermittent water supply equipment - Google Patents

Abstract

To provide intermittent water supply equipment that can stably and accurately irrigate.SOLUTION: The intermittent water supply equipment of this application consists of an airtight case made of resin, a first floating portion made of resin which is provided outside the airtight case and opens and closes a vent of the airtight case, a second floating portion made of resin which is provided inside the airtight case and opens and closes a water supply port, the second floating portion being lowered when the water level decreases, resulting in supplying water, the first floating portion being raised when the water level rises, resulting in release of the sealing of the airtight case, and the second float being raised, resulting in stopping water supply.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an intermittent rehydrator for performing optimal automatic irrigation management according to indoor and outdoor environments.

Conventionally, environmental improvement by plant cultivation has been proposed, but in particular, rooftop or wall greening in harsh environments suppresses the temperature rise on the rooftop by the heat of vaporization due to the fixation and transpiration of the plant's original CO _2. It is receiving nationwide attention as a measure to mitigate the heat island phenomenon in urban areas. For this reason, various inventions of rooftop greening and wall greening have been proposed. In particular, various proposals have been made for watering the roof, walls and roof, which are easily dried by sunlight, and for a water retention medium.

  The conventional irrigation system electrically controls a water supply / collection pump and an opening / closing electromagnetic plug, and in particular, water supply is operated at predetermined time intervals.

  The growth environment of the plant greatly differs depending on the season and the weather of the day, and the amount of irrigation water greatly varies depending on the growth condition of the vegetated plant from the state of buds to the state of prosperity. Furthermore, on the rooftop of a building, the environment changes more greatly than the environment in contact with the ground. For this reason, in the rooftop greening, the conventional automatic water supply system at regular intervals causes excessive or insufficient water supply, and water supply suitable for plant growth has not been performed. For this reason, irrigation management has been an important issue in solving the problem of rooftop greening.

  Patent Document 1 proposed by the present inventors discloses a water level adjusting device capable of adjusting water supply to a growing pot of a plant or a planter, and a water receiver and a planter using the water level adjusting device.

  FIG. 7 is a cross-sectional view showing the structure of the water level adjusting device 1 of Patent Document 1. The water level adjusting device 1 has an air hole 17 in an upper wall of the case 10 having an open bottom surface, and a first float 20 which rises due to a rise in the water level opens and closes the air hole 17 with a ventilation plug 24 due to its up and down movement. And a second float 30 that rises and falls according to a change in water level in the case 10 is provided so as to open and close the water inlet 16 connected to the water supply pipe. When the water level adjustment device 1 reaches the irrigation start water level, the second float 30 tilts as shown by the slope line of the start of water injection, opens the water injection port 16 to inject water, and when the water level reaches the maximum water level, the water injection port 16a is closed. close. At this time, the second float 30 rises due to the water level and the water tap is closed, and when the water level drops as the irrigated plant draws up and consumes the water supply, the first float 20 drops and the air hole 17 is closed. The inside of the detached case 10 is in a reduced pressure state, and the second float 30 is prevented from falling with the water level. When the water level falls below the height of the ventilation groove 18 provided on the side wall of the case 10 (irrigation start water level), the pressure in the case 10 is released by the air flowing from the ventilation groove 18 and the second floating 30 is tilted to the tilt position at the start of water injection to start water injection.

  If this water level adjusting device 1 is provided at the bottom of the water receiver and is connected to the upper water storage tank, the power can be intermittently adjusted according to the water consumption of the plant without using power such as electric control or a pump. Irrigation can be performed. The plants in the flower pots placed in the water receiver consume water according to the season and weather, and can be completely consumed before watering. This repetition resulted in alternate supply of water and air to the planting soil, and the soil activation and plant growth conditions could be made ideal. For this reason, it has been desired to apply the present invention to irrigation management even on rooftops and wall greening.

  In applying the water level adjusting device 1 of the present invention, it is required that there is no failure in long-term operation on a roof or a place where maintenance of a wall is difficult, and it can be accommodated in a narrow planting container attached to a wall or the like. Therefore, a highly reliable intermittent rehydrator was required. However, there is a problem that it is difficult to reduce the size of the first float and the second float, which sense the water level, and that the operating water level varies due to fluctuations in temperature and atmospheric pressure because the bottom surface of the second float is open.

  In order to solve this problem, in Patent Document 2 proposed by the present inventors, the second floating portion is a buoyant body made of a foamed synthetic resin. However, although rare, water may enter the foamed portion of the foamed synthetic resin, and the buoyancy of the second floating portion may be reduced.

Patent No. 3421848 Patent No. 4644877

  The present invention solves the above-mentioned technical problem, and an object of the present invention is to provide an intermittent rehydrator that can perform stable and accurate irrigation.

  According to the embodiment of the present invention, an airtight case, a first floating portion provided outside the airtight case to open and close a ventilation hole of the airtight case, and a second floating portion provided inside the airtight case to open and close a water supply port. A floating portion, and an intermittent water refill comprising the airtight case, wherein the lower surface of the rectangular parallelepiped is open, the upper surface and the side surfaces are airtightly closed, the inside of which has a large-volume floating chamber, and a small-volume air chamber. The airtight case is partitioned by a partition, and the outer side wall on one side of the floating chamber of the airtight case is shorter than the lower surface by a predetermined length, and a second ventilation groove is formed on the lower surface. A ventilation groove is formed on the lower surface slightly shorter, wherein the lower surface of the second ventilation groove is located higher than the upper surface of the first ventilation groove, and the opening area of the first ventilation groove is equal to the second ventilation groove. Is formed wider than the opening area of the The horizontal plate is provided with a water supply pipe connecting portion provided downward, a fitting shaft for rotatably holding the second floating portion at the tip of the horizontal plate, and the first floating portion rotating above the air chamber on the opposite side. A fitting shaft for holding freely, and further comprising the ventilation hole opened on the upper surface of the partition wall of the partition so as to straddle two chambers, a floating chamber and an air chamber, wherein the first floating part is located above the air chamber. A first connecting portion rotatably supported by the fitting shaft of the first connecting portion, a ventilation plug provided at a position facing the air hole of a bridging portion connecting the first connecting portion, It is characterized by comprising two first box parts provided downward on the left and right of the tip part, and a first lid fixed to the first box part.

  The second floating portion pivots when lifted by buoyancy, closes the water supply port with the water supply plug, and the first floating portion rotates when lifted by buoyancy, closing the vent from the vent hole. The plug is formed to be separated.

  The water supply plug and the ventilation plug are formed by fitting a cylindrical plug made of an elastic member having weather resistance into a mounting hole provided in the inner rod portion or the bridge portion, and the first box portion and the first cover are fitted. 2. The intermittent rehydration device according to claim 1, wherein the fixing of the second box portion and the second lid is performed by any of an adhesive, a welding, and a water-resistant double-sided tape.

  ADVANTAGE OF THE INVENTION According to the intermittent rehydration device of this invention, it becomes possible to perform watering stably and accurately.

It is a figure which shows the intermittent rehydration device of this invention, (a) is a front view, (b) is a top view. The structure of an airtight case is shown, (a) is a front view, (b) is a top view. The structure of the 1st floating part is shown, (a) is a front view, (b) is a side view. It is a top view showing the structure of the 2nd floating part. It is a figure which shows the operation state of the intermittent water supply device 50 of this invention, (a) is sectional drawing which shows operation | movement of the water supply start state, (b) is sectional drawing which shows operation | movement of water supply stop state. FIG. 3A is a front view and FIG. 3B is a plan view of the intermittent water refill according to the present invention housed in a dustproof case. It is sectional drawing which shows the structure of the conventional water level adjustment apparatus.

An embodiment of an intermittent rehydrator according to the present invention will be described in detail with reference to the drawings. In the drawings, the relative size of each element is exaggerated for clarity.
1A and 1B are diagrams showing an intermittent water refill according to the present invention, wherein FIG. 1A is a front view and FIG. 1B is a plan view.

  The intermittent water refill 50 shown in FIG. 1A includes a resin-made airtight case 60, a resin-made first floating portion 70 provided outside the airtight case 60, and opening and closing a ventilation hole 66 of the airtight case 60. A second floating portion 80 made of resin is provided inside the airtight case 60 and opens and closes the water supply port 62a.

  The airtight case 60 is open at the lower surface of the rectangular parallelepiped, airtightly closed at the upper surface and side surfaces, and is internally partitioned by a partition 64 into two large-volume floating chambers 60a and small-volume air chambers 60b.

  Further, the outer surface wall 63 on one side of the floating chamber 60a of the airtight case 60 is shorter than the lower surface by a predetermined length, the first ventilation groove 60c is formed on the lower surface, and the outer surface wall 65 on one side of the air chamber 60b is separated from the partition wall 64. A short second ventilation groove 60d is formed on the lower surface.

  In this embodiment, the upper surface of the first ventilation groove 60c is formed to be lower than the lower surface of the second ventilation groove 60d, and the opening area of the first ventilation groove 60c is wider than the opening area of the second ventilation groove 60d. It is formed. Thus, the air in and out of the airtight case 60 can be smoothly taken in and out.

  At the lower end of the outer side wall 63 of the floating chamber 60a, a horizontal plate 61 extending to the outside is provided, and the horizontal plate 61 is provided with a water supply pipe connecting portion 62 provided downward.

  The water supply pipe connection part 62 is a member that receives water supplied from a watering tank (not shown) at a constant water pressure due to a head drop by connecting a water supply pipe, has a pipe receiving port, and has an inverted L-shape. It is formed so as to be bent and rise from the horizontal plate 61. The lower end of the water supply pipe connection portion is a water supply port 62 a opened at the bottom of the horizontal plate 61.

  Further, a fitting shaft 67 that rotatably holds the second floating portion 80 is provided at a distal end portion of the horizontal plate 61. The second connecting hole 81a of the second connecting portion 81 of the second floating portion 80 is fitted to the fitting shaft 67, and the second floating portion 80 turns up and down around the fitting shaft 67 as the water level rises and falls. .

  On the other hand, on the upper surface of the air chamber 60b opposite to the airtight case 60, left and right fitting shafts 68 that rotatably hold the first floating portion 70 are provided on the left and right. The first connecting hole 71a of the first connecting portion 71 of the first floating portion 70 is fitted to the fitting shaft 68, and the first floating portion 70 rotates up and down around the fitting shaft 68 as the water level rises and falls. .

  On the upper surface (ceiling portion) of the airtight case 60, a vent hole 66 is provided at a position corresponding to the upper surface of the partition wall 64 so as to extend over the floating chamber 60 a and the air chamber 60 b. In other words, the center of the ventilation hole 66 is set on the center line of the partition wall 64, the diameter of the hole is formed to be larger than the width of the partition wall 64, and the structure communicates with both the floating chamber 60a and the air chamber 60b. ing.

  Next, the first floating portion 70 will be described.

  The first floating portion 70 is a bridge connecting the left and right first connection portions 71 rotatably supported by a fitting shaft 68 provided at a location extending from the upper surface of the air chamber, and the left and right first connection portions 71. And a unit 72.

  The bridge portion 72 is provided with a ventilation plug 73 at a position facing the ventilation hole 66, and further, two left and right first box portions 74 are provided on the left and right of the distal end portion of the first connection portion 71. The first lid 74 ′ is fixed to the one box part 74 to form a buoyant body 75. The ventilation plug 73 is formed by fitting a cylindrical plug made of a weather-resistant elastic member into a mounting hole provided in the outer rod portion 72.

  The first box portion 74 and the first lid 74 'are fixed by any one of adhesive, welding, and water-resistant double-sided tape to keep the inside tight.

  When the irrigation starts and the bottom water level of the planting vessel in which the intermittent rehydration device 50 is installed rises, the first floating portion 70 causes the first connecting portion 71 to float due to the buoyancy of the buoyant body 75 floating in the water. The vent plug 73 is lifted up, pivots upward about the fitting shaft 68, and is provided at a position facing the vent 66, and the vent plug 73 closing the vent 66 moves upward, opening the vent 66, The air in the floating chamber 60a and the air chamber 60b of the airtight case 60 can be discharged upward (outside).

  This movement depends on the balance between the weight of the first floating portion 70 and the buoyant body 75 in the water. While the ventilation hole 66 is closed, the second floating portion 80 is hindered by the air pressure in the floating chamber 60a, and the rise due to buoyancy is restricted.

  Next, the second floating portion 80 will be described.

  The second floating portion 80 includes a second connecting portion 81 rotatably supported by a fitting shaft 67 at a distal end of a horizontal plate 61 extending forward of the airtight case 60, and a floating chamber 60 a of the airtight case 60. The inner rod portion 82 is provided with a water supply plug 83 at a position facing the water supply port 62 a provided on the bottom surface of the horizontal plate 61. The water supply plug 83 is formed by fitting a cylindrical plug made of an elastic member having weather resistance into a mounting hole provided in the inner rod portion 82.

  The inner rod portion 82 extending into the floating chamber 60a is provided with a second box portion 84 and a second lid 84 'of the second box portion 84, and the second box portion 84 is fixed with a second lid 84'. , The buoyancy body 85 is formed.

  The second box portion 84 and the second lid 84 'are fixed by any one of adhesive, welding, and water-resistant double-sided tape to keep the inside tight.

  As shown in FIG. 1A, when the buoyant body 85 is on the bottom surface, the buoyant body 85 of the inner rod portion 82 of the second floating portion 80 faces downward with the second connecting portion 81 as an axis. The water supply stopper plug 83 at a position facing the water supply port 62a is formed so as to be separated from the water supply port 62a downward, so that the water supply port 62a is opened. When the irrigation water level rises, the upper surface of the buoyant body 85 rotates until it reaches the ceiling of the floating chamber 60a.

  FIG. 1B is a plan view of the intermittent rehydrator 50. In this figure, the first floating portion 70 is disposed above the airtight case 60, and the airtight case 60 is composed of a horizontal plate 61 provided at the front, a water supply pipe connecting portion 62 rising from the horizontal plate 61, and a horizontal plate. 6 shows a fitting shaft 67 provided on the left and right of the tip of 61.

  The first floating portion 70 includes a first connecting portion 71 connected to the fitting shaft 68, two hollow first box portions 74 provided downward on the left and right of the distal end of the first connecting portion 71, It has a buoyant body 75 composed of a first lid 74 ′ fixed to the box 74.

  Next, the airtight case 60 will be described in more detail with reference to FIG. 2A and 2B show the structure of the airtight case 60, wherein FIG. 2A is a front view and FIG. 2B is a plan view.

  The same structures and functions as those described with reference to FIG.

  As shown in FIG. 2A, the horizontal plate 61 is provided so as to extend horizontally from the lower end of the outer side wall 63 of the airtight case 60, that is, the upper part of the first ventilation groove 60c.

  As shown in FIG. 2A, the horizontal plate 61 is provided so as to extend horizontally from the lower end of the outer side wall 63 of the airtight case 60, that is, the upper part of the first ventilation groove 60c.

  The upper surface of the horizontal plate 61 is provided with a reinforcing wall 61b extending between the outer side wall 63 of the airtight case 60 and the water supply pipe connection portion 62, and reinforcing walls 61a provided at both ends of the horizontal plate 61, for connection of the water supply pipe. , So that the second floating portion 80 can be supported reliably.

  The left and right side walls 69 of the airtight case 60 extend to the bottom surface, but the front outer side wall 63 from which the horizontal plate 61 extends is formed short, and the first ventilation groove 60c is opened between the left and right side walls 69 and the bottom surface. ing.

  On the other hand, the outer side wall 65 outside the air chamber 60b is slightly shorter, and is formed higher in distance from the bottom surface than the first ventilation groove 60c.

  In this embodiment, when the water level raised by irrigation by water supply is consumed by the plants and the water level decreases, first the water trapped in the air chamber 60b is discharged from the opening of the second ventilation groove 60d to the outside, When the water level is lowered from the opening of the first ventilation groove 60c after being exchanged with the outside air, the water trapped in the floating chamber 60a is discharged to the outside and exchanged with the outside air, and the water level in the floating chamber 60a is intermittent. It descends to the same position as the water level of the water receiver (not shown) arranged under the water supplement.

  The ventilation hole 66 opened on the upper surface (the ceiling portion) of the airtight case 60 has the center on the center line of the partition wall 64, the diameter of the hole is larger than the width of the partition wall 64, and the air hole 66a Since the structure communicates with both of the chambers 60b, the outside air flowing into the air chamber 60a from the second ventilation groove 60d flows through the gap in the ventilation hole 66 into the floating chamber 60a. Since the trapped water is not discharged smoothly, the operation of starting the water supply (the lowering of the second float) is not delayed.

  FIG. 2B is a plan view of the airtight case 60. This shows that the ventilation hole 66 is formed on the center line of the partition wall 64 and communicates with both the floating chamber 60a and the air chamber 60b.

  3A and 3B are views showing the first floating portion 70, wherein FIG. 3A is a front view and FIG. 3B is a side view.

  As shown in FIG. 3A, a first connection hole 71 a is formed in the first connection portion 71 so as to be rotatably fitted to the fitting shaft 68 of the airtight case 60. When the buoyancy body 75 formed on the left and right of the part rises due to the rise of the water level, the ventilation plug 73 in the bridging part 72 is lifted upward to open the ventilation hole 66 of the airtight case 60. The air hole 66 is closed.

  The first floating portion 70 controls the operation of the second floating portion 80 provided in the airtight case 60 by opening and closing the air hole 66 of the airtight case 60, and while the air hole 66 is closed. The air inside the hermetic case 60 suppresses a rise in the water level inside the hermetic case 60, the water level outside the hermetic case 60 reaches a certain water level, the vent 66 is opened, and the air inside the hermetic case 60 is discharged, so that the air inside the hermetic case 60 is discharged. Rises, the second float 80 rises, and the water supply port 62a is closed.

  FIG. 4 is a plan view of the second floating portion 80. The second connecting portion 81 is formed with a second connecting hole 81a for rotatably fitting the fitting shaft 67 of the airtight case 60. When the buoyant body 85 rises due to the rise of the water level, the inner rod is formed. The water supply plug 82 provided upward at the base of the part 82 is moved upward to close the water supply port 62a provided in the airtight case 60, and the water supply is stopped.

  5A and 5B are diagrams showing an operation state of the intermittent water replenisher 50 of the present invention, in which FIG. 5A is a cross-sectional view showing an operation in a water supply start state, and FIG. 5B is a cross-sectional view showing an operation in a water supply stop state.

  FIG. 5A shows a case where the level of the irrigated water has dropped to the state of W3. That is, in a state where the water level W3 is the same height as the first ventilation groove 60c, at this time, the water trapped in the air chamber 60b is discharged from the second ventilation groove 60d, and the outside air flows in as indicated by the arrow A. Then, the water flows into the floating chamber 60a from the gap of the ventilation hole 66, and the water trapped in the floating chamber 60a is also discharged from the first ventilation groove 60c. For this reason, the water level in the floating chamber drops to W3, the second floating portion 80 drops, the water supply plug 83 separates from the water supply port 62a, and the water supply with water pressure flows from the water supply pipe connection part 62.

  FIG. 5B shows a case where the level of the irrigated water has risen to the state of W2. At this time, the buoyant body 75 of the first floating portion 70 rises to separate the ventilation plug 73 from the ventilation hole 66, and the air in the floating chamber 60a and the air chamber 60b flows out from the ventilation hole 66 to the outside as shown by the arrow B. The water blocked by the air flows into the floating chamber 60a and the air chamber 60b and fills up to the same level as the external water level W2. Therefore, the buoyant body 85 of the second floating portion 80 is lifted up, and a water supply plug 83 provided at the tip of the inner rod portion 82 closes the water supply port 62a, and is a cross-sectional view showing the structure of the adjusting device for stopping water supply. .

  FIGS. 6A and 6B show an intermittent water refill according to the present invention housed in a dustproof case, wherein FIG. 6A is a front view and FIG. However, the cross section of the dustproof case is shown.

  6, the dustproof case 51 has a pipe hole 51a through which a water supply pipe 52 passes. The intermittent water replenisher 50 is mounted on a planter, a pallet, a pot bottom, or the like, but is hardly moved or cleaned during cultivation. For this reason, it is desirable to cover the dust-proof case 51 for preventing invasion of dirt from the outside.

  According to the use of the intermittent rehydration device of the present invention, the type and size of the plant, water and air are alternately supplied in accordance with changes in weather conditions, and a single drop of water does not go outside. And the plant can be operated accurately for 24 hours, so that the plant grows without stress. Stress-free plants grow tremendously.

  In a place where rainwater does not hit, such as a veranda, water can be supplied from the bottom hole simply by placing all existing pots on the water supply stand for plant cultivation, and the bottom can be easily made into a water supply bowl. Moreover, if it is installed under the planting, it is possible to prevent death due to drying.

  In addition, by attaching to a hanging container using a space, labor for watering can be saved and water stress of the plant can be eliminated, so that the plant can be grown without replanting.

  Moreover, if it is used for a container for rooftop greening, it can be used as a plant cultivation table that repeats germination, growth and prosperity of all plants. It is lightweight without using soil, and can make a large amount of evapotranspiration from plant leaves and cultivation table.

  In addition, a variable plant cultivation pot according to the angle of the sloping roof can be realized by downsizing the intermittent rehydrator. According to this, a large amount of water can be evaporated through the leaves of all the plants, and a roof surface full of flowers can be realized without any wasteful discharge of water.

  In addition, the downsizing of the intermittent rehydrator makes it possible to provide a planting case that is thin and can be mounted on a wall surface, and enables greening of the wall surface even for a plant with a large amount of transpiration.

  When realizing a biotope that reproduces a natural ecosystem in the form of artificial ground, the intermittent rehydrator of the present invention can be easily realized.

  By using the intermittent rehydration device of the present invention, it is possible to irrigation the original plant that can respond to the weather that changes every moment, and to improve the environment such as rooftops, sloped roofs, wall surfaces, pedestrian bridges, street lights, pavement surfaces, and median strips. You will be able to select any plant, even in harsh conditions.

DESCRIPTION OF SYMBOLS 1 Water level adjustment device 10 Case 17 Air hole 18 Vent groove 20 First float 24 Air hole sealing plug 30 Second float 34 Injection tap 50 Intermittent rehydrator 51 Dustproof case 51a Pipe hole 52 Water supply pipe 60 Airtight case 60a Floating chamber 60b Air chamber 60c First ventilation groove 60d Second ventilation groove 61 Horizontal plate 62 Water supply pipe connection portion 62a Water supply port 63 Outer side wall 64 Partition partition 65 Outer side wall 66 Vent hole 67 Fitting shaft 68 Fitting shaft 69 Side wall 70 First float Part 71 First connecting part 71a First connecting hole 72 Outer rod part 73 Vent plug 74 First box part 74 'First lid 75 Floating body 80 Second floating part 81 Second connecting part 81a Second connecting hole 82 Inner rod Part 83 water supply plug 84 second box part 84 'second lid 85 buoyant body

Claims (4)

An airtight case made of resin; a first floating portion made of resin provided outside the airtight case to open and close a ventilation hole of the airtight case; and a second floating resin made inside the airtight case to open and close a water supply port. An intermittent water refill comprising a floating portion and
The airtight case has an opening at a lower surface of a rectangular parallelepiped, an upper surface and side surfaces closed in an airtight manner, and an interior partitioned by a partition into a large-volume floating chamber and a small-volume air chamber. A first ventilation groove is formed on the lower surface of the outer side wall on one side shorter than the lower surface by a predetermined dimension, an outer side wall on one side of the air chamber is shorter than the partition wall, and a second ventilation groove is formed on the lower surface;
Here, the lower surface of the second ventilation groove is located higher than the upper surface of the first ventilation groove, and the opening area of the first ventilation groove is formed wider than the opening area of the second ventilation groove. A water supply pipe connecting portion provided downward on a horizontal plate extending outward from the lower end of the outer side wall, and a fitting shaft for rotatably holding a second floating portion at a distal end portion of the horizontal plate; Further provided with a fitting shaft for rotatably holding the first floating portion, and further provided with the ventilation hole opened on the upper surface of the partition wall of the partition so as to straddle two floating chambers and an air chamber,
The first floating portion is provided at a position opposed to the vent hole of a first connecting portion rotatably supported by a fitting shaft above the air chamber and a bridging portion connecting the first connecting portion. And a first lid portion fixed to the first box portion, two first box portions provided downward on the left and right of the distal end portion of the first connection portion, and a first lid fixed to the first box portion,
A second connecting portion rotatably supported by a fitting shaft provided at a distal end portion of the horizontal plate; an inner rod portion extending into the floating chamber of the airtight case; A buoyancy member comprising a water supply plug provided at a position facing the water supply port, a second box provided at a tip of an inner rod extending into the floating chamber, and a second lid fixed to the second box. And an intermittent rehydration device characterized by comprising:   The second floating portion pivots when lifted by buoyancy, closes the water supply port with the water supply plug, and the first floating portion rotates when lifted by buoyancy, closing the vent from the vent hole. The intermittent rehydrator according to claim 1, wherein the stopper is formed so as to be separated.   2. The water supply plug and the ventilation plug according to claim 1, wherein a cylindrical plug made of a weather-resistant elastic member is fitted in a mounting hole provided in the inner rod portion or the bridge portion. The intermittent rehydrator described.   2. The intermittent operation according to claim 1, wherein the fixing of the first box portion and the first lid and the fixing of the second box portion and the second lid are performed by any one of adhesive, welding, and water-resistant double-sided tape. Type rehydrator.

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