JP3643415B2 - Water meter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to improvements in water meters.
[0002]
[Prior art]
A dry water meter in which tap water is prevented from entering a register box that constitutes an instruction unit for instructing the amount of water used has a structure shown in FIG.
[0003]
In the figure, 1 is a lower case, 2 is an inlet for tap water, 3 is an outlet, 4 is a rotatable impeller provided in the flow path, and 5 is a pivot that supports the impeller 4 to be rotatable. 1 is erected.
[0004]
Reference numeral 6 denotes a ring-shaped magnet attached to the upper end of the impeller 4, which drives and rotates a tooth train in a register box, which will be described later, with a magnetic force.
Reference numeral 7 denotes a bottomed cylindrical register box, which is made of a plastic molded product from the viewpoint of productivity such as cost and delivery date.
[0005]
In the register box 7, a direct-reading display wheel 8, a tooth wheel train 9 that drives the display wheel, a drive gear 10 that constitutes the tooth wheel train 9, a magnet 11 attached to the drive gear 10, and the like are housed. An inorganic glass 12 is attached to the top as a lid via an O-ring 13.
[0006]
Reference numeral 14 denotes an upper case, which is attached and fixed to the lower case 1 through an O-ring 15 in a watertight manner.
Reference numeral 16 denotes a plastic lid, which is attached to the upper case 14 so as to be opened and closed. Reference numeral 17 denotes an adjuster attached to the lower surface of the register box 7.
[0007]
Tap water enters the lower case 1 from the inlet 2, rotates the impeller 4, and flows out from the outlet 3. The rotation of the impeller 4 is transmitted to the drive gear 10 by the magnetic force of the magnets 6 and 11, and the display wheel 8 is rotated to indicate the amount of water used.
[0008]
[Problems to be solved by the invention]
In the above conventional technique, since the channel around the impeller 4 is filled with tap water, the bottom of the plastic register box 7 is affected by the water vapor pressure P ₁ of the channel. The water vapor pressure P ₂ in the register box increases to the saturated water vapor pressure.
[0009]
And especially in winter, the temperature t _{2 on} the upper surface of the inorganic glass 12 becomes lower than the tap water in the lower case, and becomes lower than the internal temperature of the indicator, that is, the internal temperature t ₁ of the register box 7.
[0010]
Therefore, water vapor in the register box, in particular, water vapor in a portion in contact with the lower surface of the inorganic glass 12 is cooled and condensed on the inner surface (lower surface) of the glass. In the register box, the convection in which the water vapor rises is generated, and the dew condensation phenomenon further progresses, and the glass 12 becomes cloudy, which hinders the interpretation of the amount of water used.
[0011]
In particular, in a dry water meter, since the thickness of the inorganic glass 12 is smaller than that of a wet water meter, the condensation is likely to occur in winter. Incidentally, although the thickness of the inorganic glass 12 is 20 mm in the wet water meter, since the water pressure is not applied in the dry water meter, cloudiness in winter is likely to occur because the inorganic glass having a thickness of 10 mm is used.
[0012]
Therefore, an object of the present invention is to provide a dry water meter that makes it difficult to cause such fogging due to condensation and does not hinder the reading of water usage.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, the invention of claim 1 is a dry-type water meter in which tap water is prevented from entering a register box that constitutes an instruction unit that indicates the amount of water used.
An organic glass (12A) for seeing through the amount of water used displayed on the instruction section is watertightly fitted to the upper portion of the register box (7) through the O-ring (13).
The thickness of the organic glass (12A) is determined to be greater than the thickness of the bottom of the register box (7),
An upper base plate (18) and a lower base plate (19) having side walls (18a) and (19a) fitted over the inner peripheral side wall of the register box (7) constituting the indicating section,
A positioning hole (21) in the lower base plate (19), a hole (30) in the upper base plate (18) through which the pilot (8A) and the pointers (8B to 8G) pass, a pilot (8A) and a pointer ( 8B to 8G) and a hole (30) between the hole (30) of the upper base plate (18), and the positioning hole (21) opened in the lower base plate (19) is a pilot (8A) or a pointer. (8B-8G) is provided at a position away from the hole (30) of the upper base plate (18) through which it penetrates without being directly opposed in the vertical direction,
The dry water meter is characterized in that the lower peripheral edge of the gap (31) is surrounded by a protrusion (32) formed integrally with the upper base plate (18) .
[0014]
The invention of claim 2 is a dry-type water meter that prevents tap water from entering a register box that constitutes an instruction unit that indicates the amount of water used.
An organic glass (12A) for seeing through the amount of water used displayed on the instruction section is watertightly fitted to the upper portion of the register box (7) through the O-ring (13).
A concave portion (12a) is provided in the center upper portion of the organic glass (12A), and a transmitter (22) having a plastic case is placed in the concave portion (12a), and a magnet (20) for operating the transmitter (22) is provided. A portion which is disposed close to the lower surface of the organic glass (12A) and does not have the concave portion (12a) and the sum of the thickness of the concave portion (12a) of the organic glass (12A) and the bottom portion of the transmitter (22). The thickness of the organic glass (12A) is set larger than the thickness of the bottom of the register box (7),
An upper base plate (18) and a lower base plate (19) having side walls (18a) and (19a) fitted over the inner peripheral side wall of the register box (7) constituting the indicating section,
A positioning hole (21) in the lower base plate (19), a hole (30) in the upper base plate (18) through which the pilot (8A) and the pointers (8B to 8G) pass, a pilot (8A) and a pointer ( 8B to 8G) and a hole (30) between the hole (30) of the upper base plate (18), and the positioning hole (21) opened in the lower base plate (19) is a pilot (8A) or a pointer. (8B-8G) is provided at a position away from the hole (30) of the upper base plate (18) through which it penetrates without being directly opposed in the vertical direction,
The dry water meter is characterized in that the lower peripheral edge of the gap (31) is surrounded by a protrusion (32) formed integrally with the upper base plate (18) .
[0018]
DETAILED DESCRIPTION OF THE INVENTION
1 to 3 show an embodiment of the present invention. Reference numeral 1 denotes a lower case provided with an inlet 2 and an outlet 3 for tap water. An impeller 4 is rotatably supported by a pivot 5 standing on the bottom thereof. Yes.
[0019]
Reference numeral 6 denotes a ring-shaped magnet attached to the upper end of the impeller 4.
7 is a plastic shaped bottomed cylindrical register box, 8A is a well-known pilot that rotates when water is used, and 8B to 8G are pointers that display liters to 100 cubic meters, respectively. Then rotate.
[0020]
The first drive gear 10 which constitutes the toothed ring column 9, 11 in the ring-shaped magnet mounted on the drive teeth wheel 10 constitutes a magnetic coupling attached at the magnet 6 and the magnetic force, the rotation of the impeller 4 Is transmitted to the tooth ring train 9.
[0021]
Reference numeral 12A denotes an organic glass formed of an acrylic resin or the like, and is watertightly fitted to the upper portion of the register box 7 through an O-ring 13.
Reference numeral 18 denotes an upper base plate, and 19 denotes a lower base plate. Most of the tooth train 9 is rotatably supported by a pivot projecting upward from the lower base plate 19. A pinion of one gear 9a constituting the tooth train 9 penetrates the upper base plate 12 and protrudes upward, and drives the driven gear 9c via the intermediate gear 9b.
[0022]
The driven gear 9c has a ring-shaped metal magnet 20 attached to its upper end.
The upper base plate 18 and the lower base plate 19 are provided with side walls 18 a and 19 a that are fitted to the inner peripheral side wall of the register box 7 over the entire circumference, respectively, and these side walls 18 a and 19 a are transmitted from the bottom of the register box 7. It is possible to prevent the water vapor from reaching the lower surface of the organic glass 12A through the gap between the outer periphery of the lower base plate 19 and the upper base plate 18 and the inner peripheral side wall of the register box 7.
[0023]
21 is a hole for positioning which opened in lower base plate 19, the hole is not facing directly vertically with the holes 30 of the upper base plate 18 to which the pilot 8A and guidelines 8B~8G passes, away from one another as viewed in plan view It is arranged at the position. In this way, holes steam passes from below the lower base plate 19 through the (gap) 21 upward, further through a gap 31 between the top hole and the pilot 8A and guidelines 8B~8G bedplate 18 Passing above the upper base plate 18 is suppressed.
[0024]
2C, the lower peripheral edge of the gap 31 is surrounded by a protrusion 32 integrally formed with the upper base plate 18, and the presence of the protrusion 32 Moisture accumulated on the back surface of the upper base plate 18 is prevented from flowing into the gap 31.
[0025]
Therefore, even if the water vapor penetrates the bottom surface of the register box 7 and enters the indicating portion due to the vapor pressure of the tap water in the lower case 1, it further enters the space between the upper base plate 18 and the organic glass 12A. Effectively suppressed.
[0026]
Reference numeral 14 denotes an upper case, which is attached and fixed to the lower case 1 through an O-ring 15 in a watertight manner. At the same time, the upper case 14 accommodates and fixes the indicating unit in the lower case 1 through the organic glass 12A. The upper case is fixed by screwing the upper case 14 to the lower case 1.
[0027]
Reference numeral 17 denotes a known adjuster attached to the lower surface of the register box 7.
At the bottom of the register box 7, a plurality of rib-shaped protrusions 7a are formed to protrude upward, and the lower base plate 19 comes into contact with the upper end of the protrusion 7a when the indicating part is stored and fixed in the lower case. Positioning is performed, and the lower surface of the upper base plate 18 is in contact with the upper end of the side wall 19a of the lower base plate 19 for positioning.
[0028]
Reference numeral 22 denotes a transmitter having a built-in magnetic sensor that detects the rotation of the magnet 20 and converts it into an electrical signal. A case is formed in a bottomed cylindrical shape, and its base (lower end) is formed in the central recess 12a of the organic glass 12A. The magnetic sensor that is inserted and mounted and detects the rotating magnetic field of the magnet 20 through the central thin portion of the organic glass 12A.
[0029]
Reference numeral 23 denotes a fixing member for attaching the transmitter 22 to the upper case 14 and is fixed to the upper case 14 by a screw 24 and a washer 25. Reference numeral 26 denotes a sealing ball for preventing the transmitter 22 from being removed by mischief.
[0030]
27 is an electric wire for transmitting the electrical signal of the transmitter 22 to a remote place.
In the said Example, since the thickness in the recessed part 12a of 12A of organic glass is thinner than another part, it is easy to heat-transfer, but the case of the transmitter 22 is shape | molded with a plastic material with poor heat conduction, and the thickness of the bottom part of the transmitter 22 By making the sum of the thickness of the central recess portion 12a of the organic glass 12A larger than the thickness of the bottom portion of the register box 7, the temperature drop of the lower surface of the organic glass 12A in winter is suppressed, and the occurrence of condensation is suppressed.
[0031]
In addition, since the metal magnet 20 is disposed close to the lower surface of the organic glass 12A, if the temperature of the lower surface of the organic glass 12A decreases in winter, the temperature of the magnet 20 also decreases, and the inside of the indicating unit, that is, the register box 7 Before the water vapor rises and dew condensation on the lower surface of the organic glass 12A, dew condensation occurs on the surface of the magnet 20.
[0032]
By doing so, fogging of the organic glass 12A is positively prevented.
When the sum of the thickness of the central recess 12a of the organic glass 12A and the thickness of the bottom surface of the transmitter 22 is increased to prevent the temperature of the lower surface of the organic glass 12A from decreasing in winter, the magnet 20 It is not necessary to be made of a metal having good heat conduction, and a ferrite magnet may be used.
[0033]
In the above embodiment, in order to attach the transmitter 22, the recess 12a is formed in the center of the organic glass 12A. However, when the oscillator is not attached, the recess 12a is not formed. Condensation can be prevented by using a larger thickness.
[0034]
In addition, it is possible to prevent fogging of the organic glass by attaching a metal disk to the lower surface of the center of the organic glass and positively condensing the disk.
[0035]
【The invention's effect】
Since this invention is comprised as mentioned above, the cloudiness of the organic glass (12A) in winter can be prevented, and the visibility of water usage-amount can be improved.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.
FIGS. 2A and 2B are diagrams for explaining the structure of the tooth ring train of the embodiment of FIG. 1, wherein FIG. It is a partially expanded sectional view which shows the provided protrusion.
FIG. 3 is a plan view of the embodiment of FIG.
FIG. 4 is a longitudinal sectional view of the prior art.
[Explanation of symbols]
7 Register box
8A pilot
8B-8G pointer 12A Organic glass 12a Recess
13 O-ring 18 Upper base plate 19 Lower base plate 18a, 19a Side wall 20 Magnet
21 hole 22 transmitter
30 holes 31 Clearance 32 Projection

Claims (2)

In a dry-type water meter that prevents tap water from entering the register box that constitutes the indicator that indicates the amount of water used.
  An organic glass (12A) for seeing through the amount of water used displayed on the instruction section is watertightly fitted to the upper portion of the register box (7) through the O-ring (13).
  The thickness of the organic glass (12A) is determined to be greater than the thickness of the bottom of the register box (7), and
  An upper base plate (18) and a lower base plate (19) having side walls (18a) and (19a) fitted over the inner peripheral side wall of the register box (7) constituting the indicating section,
  A positioning hole (21) in the lower base plate (19), a hole (30) in the upper base plate (18) through which the pilot (8A) and the pointers (8B to 8G) pass, and a pilot (8A) and pointer ( 8B to 8G) and a hole (30) between the hole (30) of the upper base plate (18), and the positioning hole (21) opened in the lower base plate (19) is a pilot (8A) or a pointer. (8B-8G) is provided at a position apart from the hole (30) of the upper base plate (18) through which it penetrates without being directly opposed in the vertical direction,
  A dry water meter characterized in that the lower peripheral edge of the gap (31) is surrounded by a protrusion (32) formed integrally with the upper base plate (18). In a dry-type water meter that prevents tap water from entering the register box that constitutes the indicator that indicates the amount of water used.
  An organic glass (12A) for seeing through the amount of water used displayed on the instruction section is watertightly fitted to the upper portion of the register box (7) through the O-ring (13).
  A concave portion (12a) is provided in the center upper portion of the organic glass (12A), and a transmitter (22) having a plastic case is placed in the concave portion (12a), and a magnet (20) for operating the transmitter (22) is provided. A portion which is disposed close to the lower surface of the organic glass (12A) and does not have the concave portion (12a) and the sum of the thickness of the concave portion (12a) of the organic glass (12A) and the bottom portion of the transmitter (22) The thickness of the organic glass (12A) is set larger than the thickness of the bottom of the register box (7),
  An upper base plate (18) and a lower base plate (19) having side walls (18a) and (19a) fitted over the inner peripheral side wall of the register box (7) constituting the indicating section,
  A positioning hole (21) in the lower base plate (19), a hole (30) in the upper base plate (18) through which the pilot (8A) and the pointers (8B to 8G) pass, and a pilot (8A) and pointer ( 8B to 8G) and a hole (30) between the hole (30) of the upper base plate (18), and the positioning hole (21) opened in the lower base plate (19) is a pilot (8A) or a pointer. (8B-8G) is provided at a position apart from the hole (30) of the upper base plate (18) through which it penetrates without being directly opposed in the vertical direction,
  A dry water meter characterized in that the lower peripheral edge of the gap (31) is surrounded by a protrusion (32) formed integrally with the upper base plate (18).

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