JP2005292096A - City water meter, and measuring part unit therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a city water meter and a measuring part unit therefor, capable of storing a plurality of components for measuring a flow rate, without generating rattlings in a container or without receiving excessive forces. <P>SOLUTION: In this measuring part unit 13 provided in this city water meter 10, dispersion is absorbed by deformation of a cantilever 54, even if the vertical-directional dimension under the condition where a magnetic sensor 30, a circuit board 34, a display 35 and an inner housing 40 are assembled, and a clearance between a bottom face of the container 31 and a perspective member 33 are dispersed. The plurality of components in the container 31 are thereby precluded from rattling in the vertical direction as in prior art, and is precluded from receiving excessive forces. A manufacturing cost is also restrained thereby, because dimensional precision of the each component need not be highly precise. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention detects the rotation of a magnet disposed above an impeller that rotates according to the flow of tap water and is fixed to the impeller, and calculates and displays the flow rate of tap water based on the detection result. The present invention relates to a measurement unit and a water meter including the measurement unit.

Conventionally, as a measuring unit of this type of water meter, a container with a bottom end has a plurality of built-in parts such as a magnetic sensor, a flow rate calculation circuit, and a display for displaying the flow rate. What closed the upper surface opening with fluoroscopic glass is known (for example, refer to patent documents 1).
Japanese Patent No. 3340241 (paragraph [0029], FIG. 1)

  However, in the measuring unit unit of the conventional water meter described above, the built-in components may rattle in the container due to variations in the dimension between the bottom surface of the container and the see-through glass and the assembled dimensions of the plurality of built-in parts. On the contrary, the built-in parts could be damaged by receiving excessive force from above and below in the container.

  The present invention has been made in view of the above circumstances, and a water meter that can accommodate a plurality of components for measuring a flow rate without shaking in the container and without receiving excessive force, and a measuring unit thereof The purpose is to provide units.

  The measuring unit of the water meter according to the invention of claim 1 made to achieve the above object is disposed above the impeller that rotates according to the flow of tap water, and rotates a magnet fixed to the impeller. Is a measurement unit unit of a water meter that calculates and displays the flow rate of tap water based on the detection result, and a magnetic sensor for detecting the rotation of the magnet, and based on the detection result of the magnetic sensor A flow rate calculation circuit board for calculating the flow rate of tap water, an indicator for displaying the calculated flow rate of tap water, and an inner housing holding the magnetic sensor, the flow rate calculation circuit board and the display unit. The container is housed inside a container with a bottom and a bottom, and the top opening of the container is hermetically sealed with a see-through member. The inner housing holds a magnetic sensor and is pressed directly or indirectly against the bottom of the container. The sensor holding member positioned in position, the housing main body positioned by being directly or indirectly pressed against the fluoroscopic member, and the elastic deformation portion elastically deformed by the vertical force from the housing main body and the sensor holding member And is provided with features.

  According to a second aspect of the present invention, in the measuring unit of the water meter according to the first aspect, the sensor holding member and the housing main body are separate parts, and either the bottom wall of the housing main body or the sensor holding member is vertically A pair of vertical movement restricting walls opposed to each other in the direction, and an inner locking wall sandwiched between the pair of vertical movement restricting walls so as to be movable up and down. It is characterized in that it is formed of an elastic beam that is integrally formed with either the main body or the sensor holding member and is pressed against the other side to urge the sensor holding member toward the bottom surface of the container.

  According to a third aspect of the present invention, in the measuring unit of the water meter according to the second aspect, the bottom wall of the housing body has an assembly opening having a side insertion opening with one end opened to the side of the housing body. The inner holding wall is sandwiched between the pair of vertical movement restricting walls, and the sensor holding member is slid and inserted into the assembly opening from the side insertion port. It is characterized in that the elastic beam formed on any one of the holding members is configured to ride on the other and be elastically deformed.

  According to a fourth aspect of the present invention, in the measuring unit of the water meter according to the third aspect, side portions are inserted into a pair of side opening edges facing each other across the assembly opening in the bottom wall of the housing body. A thick wall portion disposed on the mouth side and a thin wall portion disposed on the far side away from the side portion insertion port are formed, and an inner locking wall is constituted by the thin wall portion. A sensor housing portion sandwiched between the pair of side opening edges and housing a magnetic sensor therein, and an upper projecting piece and a lower projecting piece projecting laterally from both side surfaces of the sensor housing portion and facing in the vertical direction A pair of vertical movement restricting walls is formed from the upper and lower protrusions, and when the sensor holding member is inserted into the assembly opening, the gap between the upper and lower protrusions is formed. When the thick part passes through and the sensor holding member is inserted to the proper position of the assembly opening, By Hatsuryoku, upper protrusion is fit into the stepped portion between the thick portion and the thin portion, having characterized in that the retaining.

  According to a fifth aspect of the present invention, in the measuring unit of the water meter according to the fourth aspect, the elastic beam is formed by a portion of the bottom wall of the housing body surrounded by the slit, and on both sides of the assembly opening. The elastic beam is provided with a pair of pressing projections projecting toward the lower projecting piece, and the lower projecting piece is projected to bend the elastic beam by climbing the pressing projection. It is characterized in that the part-sliding contact tapered surface is formed.

  According to a sixth aspect of the present invention, in the measuring unit of the water meter according to the fifth aspect, the pressing protrusions are arranged side by side in a direction obliquely intersecting with the direction in which the sensor holding member is inserted into the assembly opening. However, it has characteristics.

  A seventh aspect of the invention is the measuring unit of the water meter according to the sixth aspect, wherein one elastic beam is a cantilever having a tip on the side insertion port side of the assembly opening. The other elastic beam is a cantilever having a tip on the side opposite to the side insertion slot in the assembly opening, and a pressing projection is integrally formed at the tip of each cantilever. The tip portions of these cantilevers are characterized in that they are arranged side by side in a direction that obliquely intersects the direction in which the sensor holding member is inserted into the assembly opening.

  The invention of claim 8 is the measuring unit of the water meter according to any one of claims 5 to 7, wherein a tip projection is formed at the tip of the pressing projection, and the lower projection is It is characterized in that an engagement hole is formed in which the protrusion on the tip is engaged when the sensor holding member is inserted to the normal position of the assembly opening.

  According to a ninth aspect of the present invention, in the measuring unit of the water meter according to the eighth aspect of the present invention, the protrusion on which the tip protrusion slides is engaged with the lower protrusion in the process of inserting the sensor holding member into the assembly opening. The receiving groove is formed, and at the end of the protrusion receiving groove, the protrusion receiving groove is gradually shallowened, and a bottom surface of the extrusion taper for pushing the tip protrusion out of the protrusion receiving groove and guiding it to the opening edge of the engagement hole is provided. It is characterized by

  According to a tenth aspect of the present invention, in the measuring unit of the water meter according to any one of the first to ninth aspects, the inner housing includes a substrate holding member formed separately from the housing body, and the substrate holding member is a housing. The arithmetic circuit board is fixed to the substrate holding member and the display unit is fixed to the arithmetic circuit board, and the housing main body is connected to the arithmetic circuit board of the magnetic sensor. It is characterized in that a side electric wire receiving opening for receiving the housing main body from the side of the housing main body is formed.

  The invention of claim 11 is the measuring unit of the water meter according to any one of claims 1 to 10, wherein the container is made of metal, and the container is fitted in the state where the see-through member is fitted inside the upper surface opening of the container. It is characterized in that the entire circumference of the opening edge is curled so as to be engaged with the see-through member.

  A water meter according to a twelfth aspect of the present invention is characterized in that it includes the water meter measuring unit of any one of the first to eleventh aspects.

[Inventions of Claims 1 and 12]
In the measuring unit according to the present invention and the water meter provided with the measuring unit, the magnetic sensor, the flow rate calculation circuit board, the display, and the inner housing are all housed in the container, and between the bottom surface of the container and the fluoroscopic member. It is sandwiched between and fixed. At this time, even if the vertical dimension in the state in which the magnetic sensor, the flow rate calculation circuit board, the display unit, and the inner housing are assembled and the dimension between the bottom surface of the container and the see-through member vary, these variations are elastically deformed. It can be absorbed by deformation of the part. As a result, a plurality of parts for measuring the flow rate are accommodated in the container without rattling and receiving excessive force.

[Invention of claim 2]
According to the configuration of the second aspect, the sensor holding member moves up and down relative to the housing body within the range in which the inner locking wall can move up and down between the pair of up and down movement regulating walls. Variations in are absorbed. Further, the sensor holding member is pressed against the bottom surface of the container by the elastic force of the elastically deforming portion, and rattling is prevented.

[Invention of claim 3]
According to the configuration of the third aspect, the inner locking wall is sandwiched between the pair of vertical movement regulating walls by simply sliding the sensor holding member into the assembly opening formed in the bottom wall of the housing body. Since the elastic beam is elastically deformed, the assembling work is facilitated.

[Invention of claim 4]
According to the configuration of the fourth aspect, when the sensor holding member is inserted into the assembly opening, the side portion of the assembly opening of the housing body is provided between the upper projection piece and the lower projection piece provided in the sensor holding member. When the thick part provided at the opening edge passes and the sensor holding member is inserted to the proper position of the assembly opening, the upper projecting piece is separated from the thick part in the housing body by the elastic force of the elastic beam. It fits in the stepped part with the thin part and is prevented from coming off. Thereby, a sensor holding member can be easily hold | maintained in the regular position of the assembly opening.

[Invention of claim 5]
According to the fifth aspect of the present invention, when the sensor holding member is inserted into the assembly opening, the pressing protrusions provided on the elastic beams on both sides of the assembly opening are formed on the lower projecting piece of the sensor holding member. The protruding portion slides on the tapered surface and is elastically deformed, and the lower protruding side is pushed down by both elastic beams. Thereby, when the inner housing is assembled in the container, the sensor holding member can be pressed against the bottom surface of the container.

[Invention of claim 6]
According to the configuration of the sixth aspect, since the pressing protrusion is arranged side by side in a direction obliquely intersecting with the direction in which the sensor holding member is inserted into the assembly opening, the pressing projection is arranged in the sensor holding member to the assembly opening. The pressing protrusion can be pressed to both the front position and the rear position in the insertion direction.

[Invention of Claim 7]
According to the configuration of the seventh aspect, the pair of cantilever beams capable of pressing both the front position and the rear position of the sensor holding member in the insertion direction into the assembly opening are opposite to each other. Since it is extended, it becomes more compact than the case where the pair of cantilevers are extended in the same direction.

[Invention of Claim 8]
According to the configuration of the eighth aspect, when the sensor holding member is inserted to the normal position of the assembly opening, a click feeling is obtained because the tip protrusion engages with the engaging hole, and the sensor holding member The operator can recognize that the normal position has been reached, and can hold the sensor holding member in the normal position.

[Invention of claim 9]
According to the configuration of the ninth aspect, in the process of inserting the sensor holding member into the assembly opening, the tip protrusion is slidably engaged with the protrusion receiving groove, and the sensor holding member is guided to the normal position. Wear is prevented.

[Invention of Claim 10]
According to the configuration of the tenth aspect, when the magnetic sensor and the flow rate calculation circuit board are connected to each other by the electric wire, when the electric wire is assembled to the housing main body, the electric wire has the side electric wire receiving port provided in the housing main body. It is smoothly accommodated in the housing body.

[Invention of Claim 11]
According to the structure of Claim 11, the perimeter of a see-through member is latched by the opening edge of a container, and a latching member can be fixed reliably.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
The water meter 10 of the present embodiment is configured by assembling an impeller 12 and a measurement unit 13 inside a body 11. The body 11 is formed by assembling an intermediate lid 21, a retaining cylinder 26, and a screwing ring 27 to a body main body 25. The body body 25 has a structure in which a pair of connecting pipe portions 15 and 15 are formed so as to protrude in opposite directions from the side surface of the cylindrical housing portion 14 whose axis is directed in the vertical direction. And the water pipe which is not illustrated is connected with these connection pipe parts 15 and 15, and a tap water passes the inside of the cylindrical accommodating part 14. FIG.

  The impeller 12 is formed by projecting a plurality of blades 17 radially from a shaft portion 16 extending in the vertical direction. A bearing hole 16 </ b> A is formed in the shaft center portion of the shaft portion 16 from the lower end to the upper end position. Then, the needle 18 rising upward from the center of the bottom surface of the cylindrical housing portion 14 is inserted into the bearing hole 16A of the shaft portion 16, and the upper end portion of the needle 18 is abutted against the back surface on the upper end side of the bearing hole 16A. ing. In this state, the blade 17 is held in a state of floating from the bottom surface of the cylindrical housing portion 14, and the impeller 12 rotates around the needle 18 by tap water passing through the cylindrical housing portion 14.

  A magnet 20 is fixed to the upper end portion of the shaft portion 16. The magnet 20 is polarized to the N / S pole in a direction perpendicular to the axial direction of the shaft portion 16, whereby the direction of the magnetic flux around the magnet 20 changes according to the rotational position of the impeller 12.

  A tip cover 20 </ b> A is fixed to the upper surface of the magnet 20. The tip cover 20A has a hilly shape that is rounded as a whole and has a high central portion. As a result, when the impeller 12 is lifted upward, contact between the magnet 20 and the intermediate lid 21 described below is prevented, and sliding friction between the impeller 12 and the intermediate lid 21 is reduced.

  An intermediate lid 21 is assembled to the cylindrical housing portion 14 in a state where the impeller 12 is housed on the bottom side. The intermediate lid 21 has a cylindrical shape with a bottom at the bottom as a whole, and the outer diameter on the upper end side is increased stepwise. Then, the stepped portion on the outer peripheral surface of the intermediate lid 21 is positioned against the stepped portion on the upper end opening side of the cylindrical housing portion 14.

  The intermediate lid 21 is formed with a receiving portion 22 formed by sinking the lower surface of the bottom wall upward, and the shaft portion 16 of the impeller 12 enters into the intermediate lid 21. The tip cover 20 </ b> A is opposed to the ceiling surface of the receiving portion 22 with a slight gap therebetween to restrict the vertical movement of the impeller 12 and the magnet 20 is surrounded by the inner wall of the receiving portion 22. Covered and protected.

  The measuring unit 13 is fitted into the recess 23 provided in the intermediate lid 21 from above. The measuring unit 13 is covered with a container 31 on the outside. The container 31 is formed, for example, by forming a sheet metal into a cylindrical shape with a bottom end. Further, as shown in FIG. 2, the container 31 includes a step portion 31D near the upper end, and the diameter on the upper side of the step portion 31D is larger than the diameter on the lower side. Furthermore, the bottom wall of the container 31 is formed with a bottom recess 31 </ b> T whose center portion is slightly depressed downward.

  A plurality of components are assembled and accommodated in the inner housing 40 inside the container 31. As shown in FIG. 3, the inner housing 40 can be disassembled into a housing main body 41, a sensor holding member 42, and a substrate holding member 45.

  The housing main body 41 has a bottom wall 51 on the lower surface of the cylindrical wall 50 fitted to the container 31, and has a cylindrical shape with a bottom at the bottom as a whole.

  In the cylindrical wall 50, a side electric wire receiving port 52 is formed by cutting a part in the circumferential direction over the entire top and bottom. Also, an assembly opening 60 is formed in the bottom wall 51 so as to be continuous with the side electric wire accommodation port 52. Specifically, the assembly opening 60 includes a side insertion opening 60 </ b> A continuous with the side electric wire accommodation opening 52, and the back side is closed through the center of the bottom wall 51.

  As shown in FIG. 4, in the bottom wall 51 of the housing main body 41, a pair of side opening edges 60 </ b> B and 60 </ b> B facing each other with the assembly opening 60 interposed therebetween are arranged in the depth direction of the assembly opening 60. A pair of taper portions 59, 59 are provided symmetrically in the middle portion of the head, and the width of the assembly opening 60 is narrowed in the middle of the taper portion 59, 59 toward the back side.

  The thickness of each side opening edge 60B is stepped and thinned at a position on the back side by a predetermined length from the tapered portion 59, and the side insertion port 60A side is thicker according to the present invention than the stepped portion. The portion 58 is formed, and the back side from the step portion is the thin portion 57 according to the present invention. Further, as shown in FIG. 6, the thick portion 58 and the thin portion 57 are flush with each other on the lower surface side and have a stepped portion 57D on the upper surface side.

  A pair of cantilever beams 54, 54 are formed on both sides of the assembly opening 60 on the bottom wall 51 of the housing body 41. The cantilever 54 is formed by surrounding a part of the bottom wall 51 with a slit 53. The base ends of both cantilevers 54, 54 rise from the side opening edge 60 </ b> B to the side away from the assembly opening 60, bend at a right angle, and extend parallel to the depth direction of the assembly opening 60 as a whole. ing. The tip of one cantilever 54 is arranged to face the side insertion opening 60A side of the assembly opening 60, while the tip of the other cantilever 54 is attached to the assembly opening 60. It is arranged so as to face the back side. The two cantilevers 54 and 54 are point-symmetric with respect to the center point of the bottom wall 51.

  A semi-spherical pressing protrusion 55 protrudes downward from the tip of each cantilever 54. Further, from the tip of the cantilever 54, a semispherical tip protrusion 56 smaller than the cantilever 54 protrudes downward.

  As shown in FIG. 7, the sensor holding member 42 has side protrusions 71 and 71 (corresponding to the “lower protrusion” according to the present invention) on both sides from both side surfaces of the box-shaped sensor housing portion 70. It has an overhanging structure. The sensor housing portion 70 has a flat box shape that is crushed from the vertical direction, and a sensor insertion opening 70A is opened on the end surface of the sensor housing portion 70 facing the right side in FIG. As shown in FIG. 7, slits 77 </ b> S are formed on both sides of the upper surface of the sensor housing portion 70, whereby the end portion on the sensor insertion port 70 </ b> A side of the upper surface wall 77 of the sensor housing portion 70 can be elastically deformed. ing. As shown in FIG. 8, a locking projection 77A projects downward from the tip of the upper surface wall 77 on the sensor insertion port 70A side. A locking piece 78 extends from the inner surface of the sensor housing portion 70 toward the sensor insertion port 70A. A holding protrusion 78A protrudes downward from the tip of the locking piece 78.

  The magnetic sensor 30 is inserted and assembled in the sensor housing portion 70. The magnetic sensor 30 has a flat structure corresponding to the internal space of the sensor housing portion 70, and a flat electric wire 36 extends from the rear end portion. When the magnetic sensor 30 is inserted into the sensor housing portion 70 from the sensor insertion port 70A, the locking protrusion 77A and the pressing protrusion 78A ride on the magnetic sensor 30, so that the top wall 77 and the locking piece 78 is deflected upward. Further, when the magnetic sensor 30 is inserted to the back side of the sensor housing portion 70, the locking projection 77A is opposed to the end surface of the magnetic sensor 30 as shown in FIG. Is prevented from coming off, and the pressing projection 78A comes into contact with the upper surface of the magnetic sensor 30, so that the magnetic sensor 30 is pressed and rattling is prevented.

  In addition, as shown in FIG. 7, a die hole 78 </ b> N for molding the locking piece 78 is opened in the upper surface wall 77.

  As shown in FIG. 7, the side protrusion 71 provided in the sensor holding member 42 has a substantially rectangular shape, and is disposed on the lower edge portion of both side surfaces of the sensor housing portion 70. The lower surface of the side protrusion 71 is flush with the surface (see FIG. 10). Further, side protrusions 73 (corresponding to the “upper protrusions” according to the present invention) project from the upper edge portions of both side surfaces of the sensor housing part 70 so as to face the side protrusions 71.

  A protrusion sliding contact taper surface 72 is formed on the upper surface of the end of the side protrusion 71 on the sensor insertion port 70A side. The side protrusion 71 has a protrusion receiving groove 74 extending from the end on the side provided with the sensor insertion opening 70A toward the opposite end, and is slightly separated from the end of each protrusion receiving groove 74. An engagement hole 76 is formed at a position on the extended line. Further, an extrusion taper bottom surface 75 is formed at the end of the protrusion receiving groove 74 so that the protrusion receiving groove 74 becomes gradually shallower. Furthermore, the lengths of the two protrusion receiving grooves 74, 74 provided on the both side protrusions 71, 71 are different from each other, and therefore the positions of the engagement holes 76, 76 are also different. The positional relationship between the engagement holes 76 and 76 corresponds to the positional relationship between the tip protrusions 56 and 56 between the both cantilever beams 54 and 54 in the housing main body 41.

  As shown in FIG. 6, the sensor holding member 42 is inserted into the assembly opening 60 from the side portion insertion port 60 </ b> A. At this time, the sensor accommodating portion 70 in the sensor holding member 42 enters between the side opening edges 60B and 60B on both sides of the assembly opening 60, and the side protrusion 71 and the side protrusion 73 in the sensor holding member 42 are inserted. The side opening edge 60B is sandwiched in the thickness direction.

  In the middle of the movement of the sensor holding member 42 to the back side, the pressing protrusion 55 provided on the cantilever 54 of the housing body 41 is guided by the protrusion sliding contact taper surface 72 of the side protrusion 71 and the side protrusion. Get on top of 71. As a result, the cantilever 54 is elastically deformed upward. Then, as the sensor holding member 42 moves, the pressing projection 55 slides on the side projection 71. At this time, the thin portion 57 provided at the tip of the pressing protrusion 55 moves in the protrusion receiving groove 74 in the side protrusion 71. As a result, the sensor holding member 42 is guided and sliding wear of the tip protrusion 56 is prevented. When the sensor holding member 42 approaches the normal position in the assembly opening 60, the tip protrusion 56 is pushed out from the protrusion receiving groove 74 by the pushing taper bottom surface 75 provided in the protrusion receiving groove 74. When the sensor holding member 42 reaches the normal position, the tip protrusion 56 engages with the engaging hole 76 formed in the side protrusion 71. As a result, the sensor holding member 42 is held at the normal position, and the operator can recognize that the sensor holding member 42 has reached the normal position by the click feeling of the uneven engagement.

  When the sensor holding member 42 reaches the proper position, the side protrusion 73 passes through the thick portion 58 and faces the thin portion 57, and the sensor holding member 42 is moved downward by the elastic force of the cantilever 54. Pushed down. Thereby, the side protrusion 73 moves downward by the level difference between the thin part 57 and the thick part 58, and the end part of the side protrusion 73 is the step part 57D between the thin part 57 and the thick part 58. The sensor holding member 42 is prevented from coming off (see FIG. 11).

  Furthermore, in the measurement unit 13 of the present embodiment, the pressing protrusions 55 and 55 are arranged point-symmetrically (see FIG. 5), so that the sensor holding member 42 is inserted in the assembly opening 60 in the direction of insertion. Both the front and rear positions can be pressed. And since the pair of cantilever beams 54, 54 having these pressing projections 55, 55 at their tips are opposite to each other, compared to the case where the pair of cantilever beams are extended in the same direction. A compact configuration can be achieved.

  As shown in FIG. 9, the flat electric wire 36 of the magnetic sensor 30 led out from the sensor insertion port 70 </ b> A of the sensor holding member 42 extends upward. The upper end of the flat electric wire 36 is soldered to a position near the edge of the flow rate calculation circuit board 34 (hereinafter simply referred to as “circuit board 34”). The circuit board 34 has a circular shape corresponding to the upper end opening of the housing body 41, and an electric circuit including a display 35 is mounted on the upper surface of the circuit board 34.

  The indicator 35 is a liquid crystal indicator, for example, and can digitally display the flow rate of tap water.

  An upper surface housing 43 is attached to the upper surface of the circuit board 34 so as to cover an electric circuit other than the display 35. As shown in FIG. 12, the upper surface housing 43 and the upper surface sub-housing 44 constitute a substrate holding member 45. The substrate holding member 45 has a disk shape as a whole, and can be divided into an upper surface housing 43 and an upper surface sub-housing 44 with a dividing surface provided so as to cross a part of the disk as a boundary. .

  The upper surface housing 43 constitutes most of the disk, and the upper surface housing 43 is locked to the circuit board 34 by locking claws 62 that hang downward from the upper surface housing 43. Then, as shown in FIG. 9, the upper surface housing 43 is assembled in a state of covering the entire circuit board 34 except for the solder connection portion with the flat electric wire 36, and a plurality of the upper surface housing 43 is suspended downward from the upper surface housing 43. By locking the locking claw 62 to the lower surface of the circuit board 34, the upper housing 43 and the circuit board 34 are held in an assembled state. A display window 64 is formed on the upper surface housing 43 at a position near the upper surface sub-housing 44, and the display surface of the display 35 faces upward through the display window 64. The upper housing 43 includes a recess 43A (see FIG. 2) that is open on the lower surface, in which an electric circuit mounted on the circuit board 34 is stored. Further, a plurality of pin holes 63 are provided side by side at the end of the upper surface housing 43 opposite to the upper surface sub housing 44.

  As shown in FIG. 3, a pair of dovetail grooves 66, 66 are formed on the dividing surface between the upper surface sub-housing 44 and the upper surface housing 43. Then, as shown in FIG. 12, the pair of engaging protrusions 65, 65 provided on the upper surface housing 43 are slidably engaged with the dovetail grooves 66, 66 of the upper surface subhousing 44, so The housing 43 is coupled to each other. The upper surface sub-housing 44 is also provided with a recess 44A (see FIG. 2) opened to the lower surface, in which a solder connection portion between the circuit board 34 and the flat electric wire 36 is accommodated.

  As shown in FIG. 10, after assembling the upper assembly 49 assembled with the substrate holding member 45 and the circuit board 34 and the sensor holding member 42 connected by the flat electric wire 36, as described above. The sensor holding member 42 is locked to the bottom wall 51 of the housing body 41. At this time, the flat electric wire 36 passes through the side electric wire receiving port 52 of the housing main body 41 and is smoothly accommodated in the housing main body 41.

  In this state, for example, the upper assembly 49 is raised obliquely with respect to the upper surface opening of the housing body 41, and the battery 37 is set in the housing body 41 from the upper surface opening of the housing body 41. The battery 37 connected to the circuit board 34 with a lead wire is fixed in the housing main body 41 with its axial direction facing the radial direction of the housing main body 41. Then, when the upper assembly 49 is pressed against the opening in the direction of the housing main body 41, the locking claw 61 provided on the upper portion of the housing main body 41 is locked to the upper assembly 49 (see FIG. 11).

  In this state, as shown in FIG. 13, the decorative seal 69 is pasted on the entire upper surface of the substrate holding member 45 except for the vicinity of the pin holes 63 and the display window 64. Thereby, the boundary line portion between the upper surface sub-housing 44 and the upper surface housing 43 is obscured.

  Thus, the internal component assembly 48 (see FIG. 14) in which various components are assembled to the inner housing 40 is assembled to the container 31 together with the waterproof ring 32 and the see-through member 33.

  For example, the see-through member 33 is formed in a disk shape with transparent glass, and an annular protrusion 33A protrudes downward from an outer edge portion of the lower surface thereof. Then, the outer edge portion of the upper surface of the substrate holding member 45 is fitted inside the annular protrusion 33 </ b> A so as to be disposed on the upper surface of the internal component assembly 48. Further, the portion of the see-through member 33 that faces the display window 64 of the substrate holding member 45 has a raised portion 33B that is raised upward, and the display 35 can be seen from above through this raised portion 33B. Further, a plurality of conductive pins 39 penetrate vertically in the see-through member 33, and when the see-through member 33 is assembled to the substrate holding member 45, these conductive pins 39 are inserted into the pin holes 63 of the substrate holding member 45. It enters and is conductively connected to a predetermined location on the circuit board 34. Thereby, the signal processed by the electric circuit on the circuit board 34 can be taken out of the measuring unit 13.

  The waterproof ring 32 is laid on the step portion 31 </ b> D of the container 31. In this state, the internal component assembly 48 is fitted into the container 31. Then, the substrate holding member 45 in the internal component assembly 48 is fitted inside the waterproof ring 32, and the sensor holding member 42 positioned on the lower surface of the internal component assembly 48 contacts the bottom surface of the container 31. At this time, the side protrusions 71, 71 of the sensor holding member 42 abut on the outside of the bottom surface recess 31 </ b> T in the container 31, and the central part of the sensor holding member 42, that is, the part containing the magnetic sensor 30 is the container 31. And a slight gap is formed between the container 31 and the bottom surface of the container 31.

  In this state, the see-through member 33 is laid on the upper surface of the internal component assembly 48. Then, the annular protrusion 33A of the see-through member 33 comes into contact with the waterproof ring 32 from above. As shown in FIG. 14, the internal component assembly 48 may be inserted into the container 31 with the see-through member 33 pre-assembled on the upper surface of the internal component assembly 48.

  Then, in a state where the upper surface opening of the container 31 is closed by the see-through member 33, the upper edge portion of the container 31 is curled so as to be narrowed inward by a curling machine (not shown). Specifically, the upper edge of the container 31 is deformed into a rounded shape corresponding to the R shape of the upper edge of the see-through member 33. As a result, the entire circumference of the see-through member 33 is fixed to the container 31 and the waterproof ring 32 is pressed by the see-through member 33 to be compressed and deformed. As a result, the inside of the container 31 is sealed, and the see-through member 33 is pressed against the curling portion 31C of the container 31 by the elastic force of the waterproof ring 32, thereby preventing rattling.

  In this state, the internal component assembly 48 is sandwiched and fixed between the bottom surface of the container 31 and the bottom surface of the see-through member 33. Here, the dimension L1 (see FIG. 2) between the bottom surface of the container 31 and the lower surface of the see-through member 33 is the accuracy of curling processing of the container 31, the thickness of the waterproof ring 32 and the see-through member 33, and the depth of the container 31. It varies depending on the dimensional accuracy. Further, the height dimension of the internal component assembly 48, that is, the dimension L2 (see FIG. 11) between the upper surface of the substrate holding member 45 and the lower surface of the sensor holding member 42 is also the assembly accuracy of the internal component assembly 48 and the internal components. It varies depending on the dimensional accuracy of each part constituting the assembly 48.

  Here, in the measurement unit 13 of the present embodiment, the dimension L2 between the upper surface of the substrate holding member 45 and the lower surface of the sensor holding member 42 is equal to the bottom surface of the container 31 and the fluoroscopic member even if the above-described variations occur. It is set to be larger than the dimension L1 between the lower surface of 33. The sensor holding member 42 is held so as to be movable up and down with respect to the bottom wall 51 of the housing body 41, and the sensor holding member 42 is biased toward the bottom surface side of the container 31 by the elastic force of the cantilever 54. Therefore, the sensor holding member 42 moves upward by the difference between the dimensions L1 and L2, and the variations in the dimensions L1 and L2 can be absorbed. In addition, the sensor holding member 42 is pressed against the bottom surface of the container 31 by the elastic force of the cantilever 54, so that the sensor holding member 42 is always in contact with the bottom surface of the container 31. In addition to stabilization, rattling of the internal component assembly 48 in the container 31 is prevented.

  As described above, the measurement unit 13 configured as described above is fitted from above into a recess 23 provided in the intermediate lid 21 as shown in FIG. Then, the lower surface of the container 31 in the measuring unit 13 is positioned in contact with the bottom surface of the recess 23. In this state, the retaining cylinder 26 is fitted from above the measuring unit 13, and the screw ring 27 is fitted from the upper part of the retaining cylinder 26 to the outside of the retaining cylinder 26. A flange 26 </ b> F protrudes laterally from the lower end portion of the retaining cylinder 26, and an engaging portion 27 </ b> F protrudes inward from the upper end portion of the screwing ring 27. Then, the screwing ring 27 is screwed onto the upper outer peripheral surface of the body main body 25 in a state where the locking part 27F of the screwing ring 27 is locked to the flange 26F of the retaining cylinder 26. Thereby, the measurement unit 13 is held by the retaining cylinder 26, and the water meter 10 is completed.

  A rotation door 28 is provided on the upper surface of the retaining cylinder 26, and the rotation door 28 always closes the upper surface opening of the retaining cylinder 26 and raises the rotation door 28, thereby preventing the retaining cylinder 28 from standing. The upper surface opening 26 is opened, and the display 35 of the measuring unit 13 can be seen.

  In the water meter 10 according to the present embodiment configured as described above, the magnetic sensor 30 provided at the bottom of the measurement unit 13 is located above the magnet 20 provided in the impeller 12, and the magnetic flux generated by the magnet 20. Crosses the magnetic sensor 30 in the horizontal direction. Then, the magnetic sensor 30 outputs a voltage signal corresponding to the direction of the magnetic flux crossing the magnetic sensor 30. Therefore, when the magnet 20 rotates together with the impeller 12 according to the flow of tap water, the output voltage of the magnetic sensor 30 changes. Then, the circuit of the flow rate calculation circuit board 34 provided in the measurement unit 13 measures the rotation speed of the magnet 20 based on the change in the output voltage of the magnetic sensor 30 and calculates the flow rate of tap water. The calculated tap water flow rate is displayed on the display 35.

  As described above, according to the measurement unit 13 provided in the water meter 10 of the present embodiment, the vertical dimension in the state where the magnetic sensor 30, the circuit board 34, the display 35 and the inner housing 40 are assembled, Even if the distance between the bottom surface and the see-through member 33 varies, the variation can be absorbed by the deformation of the cantilever beam 54. As a result, the plurality of parts in the container 31 do not rattle in the vertical direction as in the prior art and do not receive excessive force. In addition, this eliminates the need for high dimensional accuracy of each component, and thus manufacturing costs can be reduced. Further, in the measurement unit 13, the sensor holding member 42 is simply slid into the assembly opening 60 from the side insertion port 60 </ b> A in the assembly opening 60 formed in the bottom wall 51 of the housing body 41. Thus, since the thin portion 57 is sandwiched between the side protrusion 71 and the side protrusion 73 and the cantilever 54 is elastically deformed, no skill is required for the assembly work of the sensor holding member 42 to the housing body 41. Assembling work can be performed quickly. In addition, by curling the opening edge of the container 31 with the see-through member 33 fitted inside the upper opening of the container 31, the entire periphery of the see-through member 33 is locked to the container 31 and the container 31 is securely attached. Can be sealed.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.
(1) In the above-described embodiment, the sensor holding member 42 and the housing main body 41 are separated from each other, but the elastic deformation portion that connects the sensor holding member, the housing main body, and the sensor holding member and the housing main body to the inner housing. And may be integrally formed.

  (2) Further, the substrate holding member 45 and the housing main body 41 may be integrally formed.

  (3) In the above-described embodiment, the sensor holding member 42 is assembled from the side with respect to the housing body 41. However, the sensor holding member 42 may be assembled from the vertical direction.

Side sectional view of a water meter according to an embodiment of the present invention. Side sectional view of the measuring unit Disassembled perspective view of measuring unit Disassembled perspective view of housing body Disassembled perspective view of housing body Side sectional view of housing body and sensor holding member Perspective view of sensor holding member Side sectional view of sensor holding member A perspective view of a state in which the circuit board and the sensor holding member are connected by an electric wire A perspective view of a state in which the circuit board and the sensor holding member are connected by an electric wire The perspective view of the state which assembled | attached the sensor holding member and the housing main body. The perspective view of the state which assembled | attached the sensor holding member and the housing main body. A perspective view of a state in which the sensor holding member and the housing body are assembled. The perspective view of the state which attached the see-through member of the internal component assembly Perspective view of measuring unit

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Water meter 12 Impeller 13 Measuring unit 20 Magnet 30 Magnetic sensor 31 Container 31C Curling part 31D Step part 33 Perspective member 34 Flow rate calculation circuit board 35 Display 36 Flat electric wire 40 Inner housing 41 Housing main body 42 Sensor holding member 43 Upper surface housing 44 Upper surface sub-housing 45 Substrate holding member 51 Bottom wall 52 Side wire receiving port 53 Slit 54 Cantilever 55 Pressing protrusion 56 Tip protrusion 57 Thin part 57D Step part 58 Thick part 59 Taper part 60 Assembly opening 60A side Part insertion port 60B Side opening edge 63 Pin hole 64 Display window 69 Decoration seal 70 Sensor housing part 71 Side protrusion 72 Projecting sliding contact taper surface 73 Side projecting protrusion 74 Projection receiving groove 75 Extrusion taper bottom surface 76 Engagement hole

Claims (12)

A water meter that is arranged above an impeller that rotates according to the flow of tap water, detects the rotation of a magnet fixed to the impeller, and calculates and displays the flow rate of tap water based on the detection result. A measuring unit,
A magnetic sensor for detecting the rotation of the magnet, a flow rate calculation circuit board for calculating the flow rate of the tap water based on the detection result of the magnetic sensor, and for displaying the calculated flow rate of the tap water The display and the inner housing holding the magnetic sensor, the flow rate calculation circuit board, and the display are accommodated in a bottom-bottomed container, and the top opening of the container is sealed with a transparent member. ,
The inner housing includes a sensor holding member that holds the magnetic sensor and is positioned by being pressed directly or indirectly against the bottom surface of the container, and a housing that is positioned by being pressed directly or indirectly on the fluoroscopic member. A measuring unit unit for a water meter, comprising: a main body; and an elastically deforming portion that is elastically deformed by receiving a vertical force from the housing main body and the sensor holding member. The sensor holding member and the housing body are separate parts,
One of the bottom wall of the housing body and the sensor holding member is formed with a pair of vertical movement restricting walls opposed in the vertical direction, and on the other side, the vertical movement between the pair of vertical movement restricting walls Forming an inner locking wall that is movably clamped;
The elastic deformation portion is formed of an elastic beam that is integrally formed with either the housing main body or the sensor holding member and is pressed against the other side to urge the sensor holding member toward the bottom surface of the container. The measuring part unit of the water meter according to claim 1 characterized by things. On the bottom wall of the housing body, an assembly opening having a side insertion opening with one end opened to the side of the housing body is formed,
The sensor holding member is slid into the assembly opening from the side insertion port, whereby the inner locking wall is sandwiched between the pair of vertical movement regulating walls, and the housing The measuring unit of a water meter according to claim 2, wherein the elastic beam formed on one of the main body and the sensor holding member rides on the other and is elastically deformed. On the bottom wall of the housing body, a pair of side opening edges facing each other across the assembly opening are separated from a thick wall portion disposed on the side insertion port side and away from the side insertion port. A thin portion disposed on the far side, and the inner locking wall is constituted by the thin portion,
The sensor holding member includes a sensor housing portion sandwiched between the pair of side opening edges and housing the magnetic sensor therein, and protrudes laterally from both side surfaces of the sensor housing portion in the vertical direction. Opposing upper and lower protrusions are formed, and the upper and lower protrusions constitute the pair of vertical movement restriction walls.
When the sensor holding member is inserted into the assembly opening, the thick portion passes between the upper projecting piece and the lower projecting piece, and the sensor holding member is properly connected to the assembly opening. When inserted to the position, the upper projecting piece is accommodated in a step portion between the thick portion and the thin portion and is prevented from coming off by the elastic force of the elastic beam. 3. The measuring unit of the water meter according to 3. The elastic beam is configured by a portion surrounded by a slit in the bottom wall of the housing body, and is provided in pairs on both sides of the assembly opening.
The elastic beam is provided with a pressing protrusion that protrudes toward the lower protrusion, and the lower protrusion has a protrusion slide for bending the elastic beam by climbing the pressing protrusion. The measuring unit unit of the water meter according to claim 4, wherein a contact taper surface is formed.   6. The measuring unit of a water meter according to claim 5, wherein the pressing protrusions are arranged side by side in a direction obliquely intersecting a direction in which the sensor holding member is inserted into the assembly opening.   The one elastic beam is a cantilever beam having a tip on the side insertion port side of the assembly opening, and the other elastic beam is inserted into the side portion of the assembly opening. The cantilever is provided with a tip on the side opposite to the mouth, and the pressing protrusion is integrally formed at the tip of each cantilever, and the tip of the cantilever is formed by the sensor holding member. The measuring unit of the water meter according to claim 6, wherein the measuring unit is arranged side by side in a direction obliquely intersecting with a direction of insertion into the assembly opening.   A tip projection is formed to project from the tip of the pressing projection, and the tip projection is inserted into the lower projecting piece when the sensor holding member is inserted to a proper position of the assembly opening. The water meter measuring unit according to any one of claims 5 to 7, characterized in that an engagement hole is formed to engage the projections and depressions. The lower projecting piece is formed with a projection receiving groove into which the tip projection slides and engages in the process of inserting the sensor holding member into the assembly opening,
The end portion of the protrusion receiving groove is provided with a bottom surface of the extrusion taper that gradually shallows the protrusion receiving groove and pushes the tip protrusion out of the protrusion receiving groove and guides it to the opening edge of the engagement hole. The measuring unit of the water meter according to claim 8, wherein the measuring unit is a water meter. The inner housing includes a substrate holding member formed separately from the housing body, and the substrate holding member is assembled to the upper surface of the housing body.
The arithmetic circuit board is fixed to the substrate holding member, and the display is fixed to the arithmetic circuit board,
The housing main body is formed with a side electric wire receiving port for receiving an electric wire connecting the magnetic sensor with the arithmetic circuit board in the housing main body from a side of the housing main body. A measuring unit of a water meter according to any one of claims 1 to 9.   The container is made of metal, and is curled so that the entire periphery of the opening edge of the container is locked to the see-through member in a state where the see-through member is fitted inside the upper surface opening of the container. The measuring unit of the water meter according to any one of claims 1 to 10. A water meter comprising the water meter measuring unit according to any one of claims 1 to 11.