JP4435384B2 - Liquid storage tank - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a water level detection means such as a float switch in a liquid storage tank provided in an automatic tea dispenser or the like.
[0002]
[Prior art]
The conventional liquid storage tank float switch includes a liquid storage tank 2 below the top 4 of the automatic tea machine 1 shown in FIG. 5, and the liquid storage tank 2 has a lid 11 as shown in FIG. The guide pipe 31 is provided in a hanging shape, and a float switch 30 is attached to the lower end of the guide pipe 31.
[0003]
Further, the lid 11 of the liquid storage tank 2 is formed in a disc shape, and a circular concave portion 26 is formed in the central portion thereof, and the outer peripheral portion 12 of the lid 11 can come into contact with the flange 18 of the tank body 10. It has become.
[0004]
[Problems to be solved by the invention]
However, the conventional liquid storage tank 2 does not provide positioning for the attachment of the cover 11 of the liquid storage tank, and is structured to be detachable so that it can be easily attached and detached. A float switch provided below the cover 11 30 and the mounting plate 27 of the temperature sensor 25 may be in any position in the liquid storage tank.
[0005]
Accordingly, when the liquid storage tank lid 11 freely rotates at the time of desorption, a water level detection means may come near the discharge port 19 of the water supply pipe. In that case, when water was supplied to the liquid storage tank 2, the water hit the float switch 30, the float 32 sank, and an accurate water level could not be detected. Therefore, there was a problem that water supply continued and overflowed even at a water level where water supply was originally detected and water supply stopped.
[0006]
An object of the present invention is to prevent the water level detection means from malfunctioning by installing the water level detection means in a desired position without attaching it to the vicinity of the discharge port when the cover of the liquid storage tank is attached. .
[0007]
[Means for Solving the Problems]
As means for solving the above-mentioned problems, the invention of claim 1 is directed to a cylindrical liquid storage tank, a disc-shaped lid that covers an opening on the upper surface, and a liquid storage tank that penetrates the liquid storage tank. which a water supply pipe projecting horizontally, by the water level detecting means mounted by the mounting member to the lower surface side of the lid of the reservoir tank, and controls the water supply to the reservoir tank from the discharge port of the feed water pipes within in, to the mounting member, the abutment was suspended to reach the height of the water supply pipe plate is provided, as well as arranged in a central portion in the width direction of the abutment plate of the water level sensing unit, wherein It is characterized in that it is arranged so that the end in the width direction of the abutting plate comes into contact with the water supply pipe when the lid is rotated .
[0008]
Operation and effect of the invention
According to the first aspect of the present invention , when the lid is attached by the abutment plate provided on the attachment member for fixing the water level detecting means to the lid, the attachment position varies and the water supply pipe is provided at the position. When it is provided, the water supply pipe is in the way, so that the lid body does not fit into the liquid storage tank.
[0009]
Even when the lid is fitted in the liquid storage tank, the end of the abutting plate is provided even if the position of the lid varies, by providing a water level detecting means at the center of the abutting plate provided on the mounting member. Does not come into contact with the water supply pipe, and the water level detection means does not approach the discharge outlet of the water supply pipe.
[0010]
Therefore, the water level detection means can always detect the predetermined water level accurately without being affected by the water supplied from the discharge port of the water supply pipe.
[0011]
In addition, by attaching the water level detection means to the center of the abutting plate provided on the mounting member , the end of the abutting plate abuts the water supply pipe regardless of which direction the tank lid rotates. It was possible to produce the same effect that it was not affected by water.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected and demonstrated about the same part as the past.
In this embodiment, a liquid storage tank that is equipped in an automatic tea dispenser and stores hot water to pour tea is illustrated. As shown in FIG. 1, this liquid storage tank is composed of a tank body 10 having a bottomed cylindrical shape and a disc-shaped lid 11 that covers an opening on the upper surface thereof. At the upper end of the peripheral wall of the tank body 10, a mounting cylinder 13 is provided in a laterally penetrating manner, and a joint pipe 14 is fitted to the mounting cylinder 13.
[0013]
The joint pipe 14 has a double structure in which an overflow pipe 15 is disposed on the outer side and a water supply pipe 16 is disposed on the inner side. The joint pipe 14 is watertightly attached via a seal ring 17 attached to the outer periphery of the overflow pipe 15. The water supply pipe 16 is formed in an L shape, and a bent portion thereof is integrally coupled to a part of the inner bottom surface of the overflow pipe 15. The discharge port 19 at one end of the water supply pipe 16 projects through the center of the opening inside the overflow pipe 15 into the tank body 10 in a horizontal posture. The connection port 20 at the other end penetrates the lower surface of the overflow pipe 15 and protrudes downward, and this connection port 20 is connected to a water supply cassette serving as a water supply source by a water supply path 22 provided with a pump 21. .
[0014]
A hose 24 is connected to an opening outside the overflow pipe 15, and this hose 24 is connected to the water supply cassette in a reflux manner.
[0015]
A concave portion 26 is formed in the central portion of the lid 11, and a float switch 30 that detects the level of hot water stored in the liquid storage tank body 10 is provided on the lower surface side of the concave portion 26.
[0016]
The float switch 30 has a float 32 fitted with a magnet 33 mounted on a vertically oriented guide pipe 31 so as to freely move up and down, and in the vicinity of stoppers 34 provided at two locations above and below the guide pipe 31. Reed switches 35U and 35L are provided, and an upper limit water level and a lower limit water level are detected by ups and downs of the float 32. For example, the upper limit water level indicates the full water level, and the lower limit water level is used to indicate the water level that needs replenishment. A lead wire 36 connected to each of the reed switches 35U and 35L is drawn out from the upper end of the guide pipe 31.
[0017]
A structure for attaching the float switch 30 to the lid 11 will be described with reference to FIGS. A mounting groove 38 is provided on the outer periphery on the upper end side of the guide pipe 31, and a retaining ring 39 such as a C ring can be fitted therein. On the other hand, the above-described retaining ring is located at a predetermined position of the recessed portion 26 of the lid 11, specifically, at a position spaced from the center of the recessed portion 26 by a predetermined dimension in a direction intersecting the extension line of the discharge port 19 of the water supply pipe 16. An accommodating portion 41 capable of accommodating 39 is formed so as to protrude upward, and at the center of the ceiling surface of the accommodating portion 41, a steadying cylinder portion 42 into which the guide pipe 31 is inserted substantially tightly is formed by burring. Further, on the back side (right side in FIG. 1) of the accommodating portion 41, a cylindrical portion 43 protruding upward is similarly formed by burring, and a screw hole 44 is cut on the inner periphery thereof.
[0018]
On the other hand, the mounting member 50 is mounted on the lid. As shown in FIG. 3, the mounting member 50 has an angled shape, the horizontal surface is the pressing plate 51, and the vertical surface is the abutting plate 52 described later in detail. It has become. A U-groove 54 that can be inserted so as to sandwich the outer periphery of the guide pipe 31 is formed on one end side of the protruding edge of the presser plate 51, and an insertion hole 56 for a screw 55 is opened at the back. .
[0019]
Then, after the retaining ring 39 is fitted in the mounting groove 38, the upper end of the guide pipe 31 is inserted from the lower surface side into the steady tube part 42 of the lid 11, and the retaining ring 39 hits the ceiling of the housing part 41. The insertion is stopped. After that, as shown in FIG. 2, the mounting member 50 is arranged in a posture crossing the protruding direction of the water supply pipe 16 and in a posture in which the protruding edge of the holding plate 51 faces the water supply pipe 16 side. The U groove 54 is fitted on the outer periphery of the guide pipe 31. Then, since the insertion hole 56 of the pressing plate 51 and the screw hole 44 of the lid 11 are aligned, the pressing plate 51, that is, the attachment member 50 is fixed by screwing into the screw hole 44 through the screw 55 from the lower surface side. The Thereby, the guide pipe 31 of the float switch 30 is attached in a hanging manner from the lower surface of the recessed portion 26 of the lid 11.
[0020]
At this time, the abutting plate 52 provided on the mounting member 50 is in a state of hanging from the recessed portion 26 of the lid 11 by a predetermined dimension in a direction crossing the projecting direction of the discharge port 19 of the water supply pipe 16. The bottom end of 52 reaches substantially the height position of the discharge port 19 of the water supply pipe 16.
[0021]
A hot water outlet 58 provided with an electromagnetic valve is provided at the lower end of the peripheral wall of the tank body 10. Further, a heater 28 (see FIG. 1) for heating is mounted on the bottom of the tank body 10, and a temperature sensor (see 25 in FIG. 4) is used to detect the hot water temperature heated by the heater 28. However, the temperature sensor mounting member 29 having the same shape as that of the mounting member 50 is provided on the lid 11 so as to face the float switch 30 in a suspended manner, and the temperature sensor mounting member 29 is disposed perpendicular to the mounting member 50. .
[0022]
Then, the effect | action of this embodiment is demonstrated. When hot water is stored, by driving the pump 21, water is pumped from the water supply cassette, discharged from the discharge port 19 of the water supply pipe 16, and gradually stored in the tank body 10. When the float switch 30 (upper reed switch 35U) detects that the water level has risen and reached the upper limit water level (chain line in FIG. 1), the pump 21 is stopped and the supply of water is stopped. The heater 28 is activated when the float switch 30 (lower reed switch 35L) is detected, and thereafter, the heater 28 is turned on and off based on the hot water temperature detected by the temperature sensor 25 and is kept at a predetermined temperature for standby. To do.
[0023]
When a tea or white hot water pouring switch (not shown) provided on the front panel 3 (see FIG. 5) is operated, hot water is discharged from the hot water outlet 58 by a predetermined amount. When the float switch 30 (lower reed switch 35L) detects that the water level has dropped due to consumption of hot water and has reached the lower limit water level, the pump 21 is driven again to supply water to the upper limit water level, Hot water temperature is controlled, and hot water is stored while the above operations are repeated. As for the timing of water supply, if the float switch 30 (upper reed switch 35U) is not detected, the pump 21 is driven to supply water, and then the float switch 30 (the upper reed switch 35U is the upper limit water level). Alternatively, the pump 21 may be stopped when it is detected.
[0024]
When the lid 11 is assembled to the liquid storage tank or when the lid 11 is provided after cleaning the liquid storage tank 2, the float switch 30 is provided in the vicinity of the discharge port 19 of the water supply pipe 16, that is, in the water supply region supplied from the discharge port. When the water is supplied, when the water is supplied, it hits the float switch 30, the float sinks in the water by the water supply, the water supply continues even at the water level where the water supply is stopped by detecting the full water, and continues to overflow In addition, even if the heater 28 is operated at the lower limit water level, it may not be possible to increase the temperature to a predetermined temperature.
[0025]
In this respect, in this embodiment, since the lower end of the abutting plate 52 provided on the mounting member 50 almost reaches the height position of the discharge port 19 of the water supply pipe 16, the abutment plate 52 is in the vicinity of the discharge port 19. When trying to prepare for, the water supply pipe gets in the way and the lid does not fit in the normal position. Further, the lid 11 is accommodated in the liquid storage tank 2, and the lid 11 is provided at any position in the opening of the tank body 10, or the lid 11 is rotated to the left as shown in FIG. Even when the rotating plate rotates, the abutting plate 52 comes into contact with the water supply pipe 16, and is separated from the discharge port 19 by the width of the guide pipe 31 provided with the abutting plate 52 and the float switch 30. By providing outside the water supply area, the float switch 30 provided in the abutting plate 52 is not affected by the water supply from the discharge port 19.
[0026]
The rotational width of the lid 11 is the distance between the attachment member 50 of the float switch 30 and the temperature sensor attachment member 29 that come into contact with the water supply pipe 19 when the lid 11 is provided in the liquid storage tank 2.
[0027]
Further, since the abutting plate 52 is integrally formed with the mounting member 50 used for mounting the float switch 30, it does not substantially increase the number of parts and can be handled at low cost.
[0028]
<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
(1) In the above embodiment, the abutting plate 52 is formed in a flat plate shape, but may be formed in a bent plate shape along the inner periphery of the liquid storage tank.
(2) The present invention is not limited to the liquid storage tank equipped in the automatic tea dispenser, and can be widely applied to all liquid storage tanks for storing a fixed amount of liquid.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a liquid storage tank according to an embodiment of the present invention. FIG. 2 is a plan view illustrating an outline of an installation position of a mounting member. Fig. 4 is a plan view of the liquid storage tank when the lid is rotated. Fig. 5 is a cross-sectional view of the main part of an automatic tea machine equipped with a liquid storage tank. Fig. 6 is an exploded view of a conventional liquid storage tank. Perspective view [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Automatic tea machine 2 ... Liquid storage tank 3 ... Front panel 4 ... Top plate 10 ... Tank main body 11 ... Cover 12 ... Outer peripheral part 13 ... Mounting pipe 14 ... Joint pipe 15 ... Overflow pipe 16 ... Water supply pipe 17 ... Sealing 18 ... Flange 19 ... Discharge port 20 ... Connection port 21 ... Pump 22 ... Water supply channel 23 ... Water supply cassette 24 ... Hose 25 ... Temperature sensor 26 ... Recessed portion 27 ... Mounting plate 28 ... Heater 29 ... Temperature sensor mounting member 30 ... Float switch 31 ... guide pipe 32 ... float 33 ... magnet 34 ... stopper 35U, 35L ... reed switch 36 ... lead wire 38 ... mounting groove 39 ... retaining ring 41 ... accommodating part 42 ... rest cylinder part 43 ... cylinder part 44 ... screw hole 50 ... Mounting member 51: Presser plate 52 ... Abutting plate 54 ... U groove 55 ... Screw 56 ... Insertion hole 58 ... Hot water outlet

Claims (1)

A cylindrical liquid storage tank, a disc-shaped lid that covers the opening of the upper surface, and a water supply pipe that penetrates the liquid storage tank and projects in a horizontal posture into the liquid storage tank, the water level detection means mounted by the lower surface side to the mounting member of the lid, in which for controlling the water supply from the outlet of the feed water pipe to the liquid storage tank, the mounting member reaches a height of the water supply pipe is provided abutting plate was hung so, while disposed in the central portion in the width direction of the abutment plate of the water level sensing means, the end portion in the width direction of the plate abutting when the lid is rotated liquid storage tanks, characterized in that is disposed so as to contact the water supply pipe.

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