JP3947262B2 - Water flow switch device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water flow switch device used for a water heater, a bath with a water heater, and the like, and more particularly, to a water flow switch device that operates a hot water supply device by detecting flowing water in a water passage using a reed switch.
[0002]
[Prior art]
In general, a hot water heater in a bath is provided with a water flow detector in its water passage, and a hot water supply device is operated after detecting the water flow. As disclosed in Japanese Utility Model Publication No. 63-35232, such a water flow switch has a flap that swings in response to a water flow. A magnet is fixed to the flap, and the flap swings. When the magnet approaches the reed switch mounted on the casing, the reed switch is connected by receiving the magnetic force (closed state), and when the magnet moves away, the switch is turned off (open state).
[0003]
Such a water flow switch device needs to have a reed switch attached to its casing at the time of manufacture (assembly). The casing is constructed by assembling a half case. In one half case, a flap chamber in which the flow channel and the flap swing is formed, and the flap is swingably attached to the other hearth case. And the other half case is fixed with a screw for assembling.
[0004]
On the other hand, a general-purpose reed switch is generally used. In the main body, the periphery of the glass tube that encloses the terminal is hardened with resin, and a screw hole is formed in the mounting piece extending from the main body. In general, a screw is inserted into a screw hole and fixed. On the other hand, the above-mentioned publication discloses a configuration in which an elastically deformable locking piece is provided on the reed switch, and is easily attached and removed.
[0005]
[Problems to be solved by the invention]
However, if a general-purpose reed switch is used and screwed into the screw hole of the reed switch as in the former case, a screw for the reed switch is required, which complicates the configuration and requires time for assembly work. There is a problem. Also, if the reed switch body is forced when tightening the screws, there is a problem that the reed switch is damaged.
[0006]
Further, the configuration in which the latch piece is provided on the reed switch as in the latter case has a problem that although the reed switch can be prevented from being damaged, the reed switch configuration is complicated and a general-purpose reed switch cannot be used.
[0007]
An object of the present invention is to provide a water flow switch device that can be easily assembled with a simple structure and that can use a general-purpose reed switch as it is.
[0008]
[Means for Solving the Problems]
The invention according to claim 1 is provided in a casing having an inlet portion for introducing a water flow and an outlet portion for leading out, a flap plate on which a magnet is fixed and swinging in response to the water flow in the casing, and the casing. In the water flow switch device that detects the water flow when the flap plate swings and the magnet approaches the reed switch, the casing is assembled by combining one half case and the other half case. The screw for tightening is fixed, and one half case is formed with a screw insertion hole to be inserted into the screw hole of the other half case, and a fitting recess for fitting the reed switch beside the screw insertion hole, the reed switch includes a mounting piece extending from the main body, the fitting recess at a position adjacent to the screw hole, cradle for receiving the attachment piece form Are, cradle is projected from the bottom surface of the portion reed switch body is positioned, a portion of the screw head for assembly inserted through the screw insertion hole protrudes into the mating recess, the fitting The mounting piece of the reed switch in the recess is pressed against and fixed to the receiving base of the fitting recess, and the main body of the reed switch has a gap between the bottom surface of the facing fitting recess . According to the first aspect of the present invention, since the reed switch is press-fitted and fixed with the screw head using the assembly screw of the casing, the reed switch screw is not required separately, The score can be reduced. Accordingly, the structure can be simplified, and the reed switch can be fixed at the same time when the casing is assembled, so that the assembling work is easy. In addition, since the reed switch is fixed by pressing a part of the mounting piece with the head of the assembly screw, the reed switch main body is less likely to be directly applied, so that the reed switch can be prevented from being damaged.
[0009]
The reed switch inserted into the recess is supported by a cradle that receives only the mounting piece, and the mounting piece is sandwiched only by the cradle and the head of the assembly screw, and the reed switch main body is opposed to the bottom surface facing it. Since there is a gap between them, no excessive force is applied to the reed switch body, and damage to the reed switch body is surely prevented.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 6 of the accompanying drawings.
[0011]
The water flow switch 1 according to the present embodiment is provided in a water passage that leads from the bath to the combustor, and detects the water flowing in the water passage and operates the combustor.
[0012]
As shown in FIGS. 1 and 2, the water flow switch 1 includes a lower case (half case) 7 in which an inlet portion 3 into which a water flow is introduced, an outlet portion 5 through which the water flow is introduced and a flap chamber 13 are formed. And an upper case (half case) 9 in which the flap plate 11 is suspended in the flap chamber 13, and the lower case 7 and the upper case 9 are fastened with screws 10a, 10b, 10c and 10d for assembly. It is fixed together. The flap chamber 13 forms a space in which a flap plate 11 (described later) inserted therein swings. In this embodiment, the upper case 9 is up and the lower case 7 is down, and the inlet portion 3 and the outlet portion 5 are installed in a horizontal position. You may equip | install in the position which turns the part 5 up.
[0013]
The lower case 7 is provided with flange portions 15 for assembling the upper case 9 on top of each other. As shown in FIG. 5, assembly screws 10a, 10b are provided at the four corners of the flange portion 15. Screw holes 12a, 12b, 12c, and 12d that are screwed into 10c and 10d are formed. A thermistor 17 is inserted in the flap chamber 13 at the bottom of the lower case 7 to detect the temperature of the water flowing through the water passage.
[0014]
The flange portion 15 is formed with a seal piece 19 protruding upward at the periphery of the upper opening 18. When the upper case 9 is assembled to the seal piece 19, an O-ring 21 is pressed to form a seal structure 20. The outer peripheral surface of the seal piece 19 is inclined from the outer side to the inner side from the base end to the front end, and an O-ring 21 is fitted on the outer peripheral surface. The seal piece 19 is configured to press-fit an O-ring 21 between a groove 51 (described later) formed in the upper case 9 described later.
[0015]
As shown in FIG. 2, the upper case 9 is formed with screw holes 25a, 25b, 25c, and 25d through which the assembly screws 10a, 10b, 10c, and 10d are passed, respectively. The screws 10a, 10b, 10c, and 10d are screwed together so as to match the screw holes 12a, 12b, 12c, and 12d.
[0016]
A fitting recess 29 for fitting the reed switch 27 is formed on the upper surface of the upper case 9, so that the reed switch 27 does not protrude from the case. The reed switch 27 mounted here is provided with a glass tube in which a pair of terminals that closes a circuit by contacting with a magnetic force is enclosed in a main body 31, and the glass tube is embedded with a resin. A mounting piece 33 is extended from the main body 31, and screw holes F and F for fixing are formed on the mounting piece 33 because they are commercially available. It is not used in this embodiment. That is, even if a slight deviation occurs in the pitch of the mounting screws, the resin is deformed, and a force is applied to the glass tube in the reed switch. Therefore, in the present embodiment, the corners of the mounting piece 33 are pressed and fixed to the upper case 9 by the heads 35 and 37 of the mounting screws 10a and 10b described above. On the other hand, a pair of pedestals 39 and 41 are formed on the bottom surface of the fitting recess 29 at positions close to the screw holes 25 a and 25 b of the upper case 9. The corners of the mounting piece 33 are placed on the pedestals 39 and 41, respectively. That is, as shown in FIG. 3, since only a part of the mounting piece 33 is sandwiched and fixed by the receiving bases 39, 41 and the screw heads 35, 37, the main body 31 can be fixed securely. As shown in FIG. 1, since there is a gap X between the upper case 9 and the reed switch 27, an excessive force is not applied, and the reed switch 27 can be prevented from being damaged.
[0017]
As shown in FIG. 5, a flap plate 11 hangs down inside the upper case 9 in a swingable manner. A magnet 43 is fixed to the flap plate 11, and when the flap plate 11 is swung up by a water flow and moves up, the reed switch 27 is approached. As shown in FIG. 4, the upper end portion of the flap plate 11 is supported by a shaft 45, and both end portions of the shaft are placed on bearings 47 a formed on the upper case 9. A bearing 47b for mounting the central portion of the shaft 45 is also formed, and the shaft 45 is pivotally supported at a total of four locations. FIG. 4 shows a state in which the upper case 9 shown in FIG. 5 is turned upside down.
[0018]
The shaft 45 is held by bearings 47 a and 47 b by an O-ring 21, and the O-ring 21 is fitted in the groove 51 of the upper case 9. Therefore, when assembling, as shown in FIG. 4, the shaft 45 is placed on the bearings 47 a and 47 b with the upper case 9 facing upward (lower side), and then the O-ring 21 is press-fitted into the groove 51. The flap plate is not dropped from the upper case 9 even if the flap plate 11 is directed downward by the holding force of the O-ring 21. Further, the upper case 9 is formed with a guide wall 53 that guides the shaft 45 to the bearings 47a and 47b so that the flap plate 11 is inserted obliquely, and the shaft 45 can be easily disposed on the bearings 47a and 47b when assembled. It has become.
[0019]
Next, with reference to FIG. 6, the seal structure by the O-ring 21 will be described.
[0020]
When the lower case 7 and the upper case 9 are assembled, the O-ring 21 is formed by the inclined outer surface 19a of the seal piece 19 described above, and the peripheral wall 55 and the bottom wall 59 that form the L-shaped cross section of the upper case 9. The configuration is such that the three points S, T, and Y are in pressure contact. Thus, since the O-ring 21 is in pressure contact at the three points S, T, and Y, a reliable seal can be achieved. Moreover, since the inclined outer surface 29a is inclined obliquely with respect to the tightening direction W of the assembly screw 10a, the tightening of the assembly screw 10a increases the tightening of the lower case 7 with respect to the upper case 9. In particular, in the screw holes 25a, 25b, 25c, 25d, 12a, 12b, 12c, and 12d formed in the upper case 9 and the lower case 7, the screw holes are centered (the center is Each screw hole and screw can be manufactured roughly. Furthermore, since the screw hole of the case 9 can be enlarged, screwing can be facilitated and workability is good.
[0021]
Next, the assembly method of the water flow switch concerning this Embodiment is demonstrated. First, as shown in FIG. 4, the upper case 9 is attached with the upper surface down and the inner side up, and the flap plate 11 is attached. In this case, the shaft 45 can be easily fitted into the bearings 47a and 47b by inserting the shaft 45 obliquely along the guide surface 53. And after arrange | positioning the axis | shaft 45 to the bearings 47a and 47b, the O-ring 21 is press-fitted in the groove | channel 51, and it mounts on the axis | shaft 45. FIG. Thereby, since the shaft 45 is supported by the O-ring 21, even if the upper case 9 is turned over and the flap plate 11 is turned down, the flap plate 11 is held by the O-ring 21 and does not fall .
[0022]
That is, as shown in FIG. 5, the flap plate 11 is directed downward, the upper case 9 is covered on the lower case 7, and the O-ring is interposed, so that the flap plate 11 is passed through the upper opening 18 of the lower case 7. Then, it is inserted into the flap chamber 13 from above.
[0023]
Next, as shown in FIG. 2, a reed switch 29 is installed in the fitting recess 29 on the upper surface of the upper case 9, and the assembly screws 10a, 10b, 10c, 10d are inserted into the screw holes 25a, 25b, 25c, 25d. The upper case 9 is fixed to the lower case 7 by being inserted and screwed into the screw holes 12 a, 12 b, 12 c, 12 d of the lower case 7. At this time, since the screw hole can be enlarged by the above-described seal structure by the O-ring 21, the assembling work by screws is easy.
[0024]
At the same time, the reed switch 27 is fixed in such a way that the corners of the mounting pieces are pressed against the pedestals 39 and 41 of the upper case 9 by the heads 35 and 37 of the mounting screws 10a and 10b.
[0025]
On the other hand, when the assembly screws 10a, 10b, 10c, and 10d are tightened, as shown in FIG. 6, the O-ring 21 is disposed on the inclined outer surface 19a of the seal piece 19, and when tightened, the outer surface 19a and the peripheral wall are tightened. 55 and the bottom wall 59 are pressed against each other at three points S, T, and Y to ensure a reliable seal. Further, since the inclined outer surface 19a is inclined with respect to the tightening direction of the assembly screw 10a, the screw hole can be centered as the assembly screw 10a is tightened, and the assembly with the screw is easy. is there.
[0026]
As described above, according to the present embodiment, the assembly (manufacture) of the water flow switch device can be facilitated, and a reed switch screw is not required for mounting the reed switch 27, so the number of parts can be reduced. As a result, the assembly process can be simplified, and an excessive force is not applied to the main body of the reed switch, so that the damage can be prevented.
[0027]
The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. For example, the screw head is not limited to the corner of the mounting piece 33 for fixing the reed switch 27, and other parts, for example, as shown in FIG. The same effect can be obtained even if the head is pressed and fixed at the head.
[0028]
【The invention's effect】
According to the first aspect of the present invention, the reed switch is press-fitted and fixed at the screw head by using the assembly screw of the casing, so a separate reed switch screw is not required and the number of parts is reduced. Can be reduced. Accordingly, the structure can be simplified, and the reed switch can be fixed at the same time when the casing is assembled, so that the assembling work is easy. In addition, since the reed switch is fixed by pressing a part of the mounting piece with the head of the assembly screw, the reed switch main body is less likely to be directly applied, so that the reed switch can be prevented from being damaged.
[0029]
A structure is provided to receive a part of the mounting piece of the reed switch so that it is pressed by the head of the assembly screw, and there is a gap between the reed switch body and the bottom surface facing it. Make sure to prevent it.
[0030]
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a water flow switch device according to an embodiment of the present invention.
FIG. 2 is a perspective view showing an assembly structure of a reed switch.
FIG. 3 is a plan view of the water flow switch device shown in FIG. 1;
FIG. 4 is an exploded perspective view showing a structure for attaching a flap plate in the upper case.
FIG. 5 is an exploded perspective view showing an assembly structure of an upper case and a lower case.
FIG. 6 is a cross-sectional view showing a seal structure using an O-ring.
FIG. 7 is a plan view of a water flow switch device according to another embodiment.
[Explanation of symbols]
1 Water flow switch 7 Lower case (half case)
9 Upper case (half case)
10a, 10b Assembly screw 11 Flap plate 27 Reed switch 31 Main body 33 Mounting pieces 35, 37 Heads 39, 41 Receiving base

Claims (1)

A casing having an inlet for introducing a water flow and an outlet for discharging, a flap plate on which a magnet is fixed and swinging in response to the water flow in the casing, and a reed switch provided in the casing, In the water flow switch device that detects the water flow when the plate swings and the magnet approaches the reed switch,
The casing is combined with one half case and the other half case, and is tightened and fixed with an assembly screw, and in one half case, a screw insertion hole that is inserted into a screw hole of the other half case, and A fitting recess for fitting a reed switch is formed beside the screw insertion hole, and the reed switch includes a mounting piece extending from the main body, and the fitting recess has a position close to the screw hole. A cradle for receiving the mounting piece is formed. The cradle protrudes from the bottom surface of the part where the reed switch body is located, and a part of the head of the assembly screw inserted through the screw insertion hole is a fitting recess. The reed switch mounting piece in the mating recess is pressed against the receiving base of the mating recess, and the main body of the reed switch has a gap between the bottom surface of the mating recess facing it. It features that you are Water flow switch device to.

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