JP6096724B2 - Water flow switch - Google Patents

Description

  The present invention relates to a water flow switch that detects the presence or absence of a water flow that is used to ignite a burner when water is passed through a water heater or the like and extinguish the burner when water flow is stopped.

  Conventionally, as this type of water flow switch, there is a main body case having a water inlet, a water outlet, a water passage connecting the water inlet and the water outlet, a lever storage chamber in the middle of the water passage, and a water flow from the water inlet. A water flow responsive lever disposed in the lever storage chamber, which has a pressure receiving portion that hits, and swings upward against its own weight with the supporting shaft on the base end side as a fulcrum by the force of the water flow acting on the pressure receiving portion, and the water flow responsive lever It is known that includes a detection switch for detecting the upward swing of (see, for example, Patent Document 1).

  Here, in the thing of patent document 1, the plate for weights is attached to a water flow response lever, and the thing of an appropriate weight is used as this plate, and an actual operating flow rate (a detection switch makes rocking | fluctuation of a water flow response lever). The flow rate when detecting and turning on / off) is adjusted to the target flow rate.

  However, the operating flow rate may change due to variations in component dimensions, and may deviate from the target flow rate. In this case, in the above-described conventional example, it is necessary to disassemble the water flow switch and to replace another weight plate with the water flow responsive lever.

Japanese Utility Model Publication No. 6-78760

  In view of the above points, an object of the present invention is to provide a water flow switch that can easily adjust the operation flow rate without disassembling the switch.

In order to solve the above problems, the present invention provides a main body case having a water inlet, a water outlet, a water passage connecting the water inlet and the water outlet, a lever storage chamber in the middle of the water passage, and a water inlet. The water flow responsive lever disposed in the lever storage chamber and oscillating around the water flow responsive lever swinging around the base shaft on the fulcrum by the force of the water flow acting on the pressure receiving portion. A water flow switch including a detection switch for detecting includes a throttle member that changes a cross-sectional area of a water passage portion between the water inlet and the lever storage chamber, and the throttle member is provided between the water inlet and the lever storage chamber. It is configured to enter the water passage portion from the proximal end side of the water flow responsive lever, and the operation portion of the throttle member can be operated from the outside of the main body case.

  According to the present invention, by changing the partial cross-sectional area of the water passage by the throttle member, the flow velocity of the water flow is changed, and the force due to the water flow acting on the pressure receiving portion is changed. Change. Therefore, the operating flow rate can be easily adjusted without disassembling the water flow switch simply by operating the operation unit from the outside of the main body case.

Even if the cross-sectional area of the water passage between the lever storage chamber and the water outlet is changed by the throttle member, the operating flow rate can be changed somewhat. However, as in the present invention, the water inlet and the lever storage If the cross-sectional area of the portion of the water passage between the chamber and the chamber is made variable by the throttle member, the amount of working water can be changed more advantageously.

Furthermore, according to the present invention , in order to reduce the area of the water passage between the water inlet and the lever storage chamber, when the throttle member is advanced deeper into this part from the proximal end side of the water flow responsive lever, The water flow lever is apt to be pushed up by intensively hitting the portion of the water flow lever that is away from the support shaft, and the operating flow rate is effectively reduced. Therefore, the lower limit value of the adjustable operating flow rate can be lowered to adjust the operating flow rate over a wide range.

(a) The cut-off side view of the water flow switch of embodiment of this invention, (b) The cut-off side view of the water flow switch of embodiment in the state which narrowed the water passage cross-sectional area. The cut perspective view of the water flow switch of an embodiment. The cutaway side view of the water flow switch of other embodiment.

  Referring to FIGS. 1 and 2, reference numeral 1 denotes a main body case constituting a water flow switch according to an embodiment of the present invention. The main body case 1 has a water inlet 11 at the lower end, a water outlet 12 at the upper end, a water passage 13 connecting the water inlet 11 and the water outlet 12, and a lever storage chamber 14 in the middle of the water passage 13. The water flow responsive lever 2 is disposed in the storage chamber 14.

  The water flow responsive lever 2 has a pressure receiving portion 21 to which a water flow from the water inlet 11 hits, and can swing around a support shaft 22 fulcrum on the base end side which is the rear side (right side in FIG. 1) of the pressure receiving portion 21. . Then, the water flow responsive lever 2 swings upward against the weight of the support shaft 22 as a fulcrum as shown by the phantom line in FIG.

  In the present embodiment, an opening 15 that faces the lever storage chamber 14 is formed on the front surface of the main body case 1, and a lever holding frame 23 that can be inserted from the front into the lever storage chamber 14 through the opening 15 is provided. The lever holding frame 23 is open on both upper and lower sides, a front part is provided with a lid part 23a for closing the opening 15, and a rear part is provided with a support shaft 22. The water flow responsive lever 2 can be attached to and detached from the main body case 1 together with the holding frame 23.

  Further, the water flow switch includes a detection switch 3 that detects the upward swing of the water flow responsive lever 2. In the present embodiment, the magnet 24 is attached to the water flow responsive lever 2, and the detection switch 3 is constituted by a reed switch attached to the upper rear surface of the main body case 1, and the magnet 24 is detected by the upward swing of the water flow responsive lever 2. When approaching the switch 3, the detection switch 3 is turned on.

  The water flow switch further includes a throttle member 4 that varies the cross-sectional area of a part of the water passage 13. In the present embodiment, the throttle member 4 is disposed on the upstream side so that the cross-sectional area of the portion of the water passage 13 between the water inlet 11 and the lever storage chamber 14 (hereinafter referred to as the upstream water passage portion) 13a can be varied. The water passage 13 a is configured to enter from the rear side, which is the base end side of the water flow responsive lever 2. More specifically, a through hole 16 facing the upstream water passage portion 13a is formed in the lower rear surface of the main body case 1, and the columnar throttle member 4 is inserted into the through hole 16 so that the upstream water passage The throttle member 4 enters the portion 13a from the rear side through the through hole 16.

  In addition, a female screw 16 a is formed at the rear portion of the through hole 16, and a male screw that is screwed to the female screw 16 a is formed on the outer periphery of the rear portion of the throttle member 4. Then, the rear portion of the throttle member 4 formed with a male screw is used as an operation portion 41, and the operation portion 41 is rotated from the outside of the case main body 1 to rotate the throttle member 4 to be screwed back and forth in the front-rear direction. The cross-sectional area of the upstream water passage portion 13a is made variable by this advancement and retraction.

  Here, when the cross-sectional area of the upstream side water passage portion 13a is narrowed by the throttle member 4, the flow velocity of the water flow hitting the pressure receiving portion 21 of the water flow responsive lever 2 increases, and the force due to the water flow acting on the pressure receiving portion 21 increases. As a result, the operating flow rate decreases. Therefore, the operating flow rate can be easily adjusted without disassembling the water flow switch by simply operating the operating portion 4a of the throttle member 4 from the outside of the main body case 1.

  Further, in order to narrow the cross-sectional area of the upstream water passage portion 13a, as shown in FIG. 1 (b), when the throttle member 4 enters the upstream water passage portion 13a more deeply from the rear side, the water flow becomes the water flow responsive lever 2. The pressure-receiving portion 21 is concentrated on the portion away from the support shaft 22 and the water flow responsive lever 2 is easily pushed up, and the operating flow rate is effectively reduced. Therefore, the lower limit value of the adjustable operating flow rate can be lowered to adjust the operating flow rate over a wide range.

  Next, another embodiment shown in FIG. 3 will be described. In this embodiment, in addition to the first throttle member 4 similar to the above embodiment that varies the cross-sectional area of the upstream water passage portion 13a, the portion of the water passage between the lever storage chamber 14 and the water outlet 12 ( Hereinafter, a second throttle member 4 ′ that changes the cross-sectional area of the downstream water passage section 13b is provided. This throttle member 4 ′ is inserted into a through hole 17 facing the downstream water passage 13 b formed in the upper front portion of the main body case 1, and is screwed into a female screw 17 a formed in the front part of the through hole 17. A male screw is formed on the outer periphery of the front portion of the throttle member 4 ′. Then, the front portion of the throttle member 4 ′ is used as the operation portion 41 ′, and the operation portion 41 ′ is rotated from the outside of the case body 1, thereby rotating the throttle member 4 ′ and screwing back and forth in the front-rear direction. The cross-sectional area of the downstream water passage portion 13b is made variable by this advancement and retraction.

  As described above, even when the cross-sectional area of the downstream water passage portion 13b is changed, the flow velocity of the water hitting the pressure receiving portion 21 of the water flow responsive lever 2 changes somewhat. Therefore, after the operating flow rate is roughly adjusted by the change in the cross-sectional area of the upstream side water passage portion 13a by the first throttle member 4, the change in the cross-sectional area of the downstream side water passage portion 13b by the second throttle member 4 '. The working flow rate can be finely adjusted.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, in the embodiment of FIG. 3, the first throttle member 4 may be omitted, and only the cross-sectional area of the downstream water passage portion 13b may be changed by the second throttle member 4 ′. Moreover, in the said embodiment, although the aperture members 4 and 4 'are made into the column shape, it is good also as a plate-shaped thing. In this case, the operation unit can be constituted by a feed screw screwed into the main body case, which is operable from the outside of the main body case and is connected to the diaphragm member so as to be relatively rotatable.

  This also applies to the water flow switch in which the water flow lever is biased and held at a fixed position by the spring, and the water flow lever is swung against the spring force by the force of the water acting on the pressure receiving part. The invention can be applied. In this case, the swing direction of the water flow responsive lever can be set to an arbitrary direction.

  DESCRIPTION OF SYMBOLS 1 ... Main body case, 11 ... Water inlet, 12 ... Water outlet, 13 ... Water passage, 14 ... Lever storage chamber, 2 ... Water flow response lever, 21 ... Pressure-receiving part, 22 ... Support shaft, 3 ... Detection switch, 4, 4 '... diaphragm member, 41, 41' ... operation unit.

Claims (1)

A main body case having a water inlet, a water outlet, a water passage connecting the water inlet and the water outlet, and a lever storage chamber in the middle of the water passage, and a pressure receiving portion that receives a water flow from the water inlet. A water flow switch comprising a water flow responsive lever disposed in the lever storage chamber that swings about a pivot on the base end side by a force of water flow acting on the fulcrum, and a detection switch that detects the swing of the water flow responsive lever
A throttle member is provided for varying the cross-sectional area of the water passage between the water inlet and the lever storage chamber, and the throttle member is provided in the water passage between the water inlet and the lever storage chamber. A water flow switch configured to enter from an end side, wherein an operation portion of a throttle member can be operated from the outside of a main body case.

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