JP5119179B2 - Flow sensor - Google Patents

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JP5119179B2
JP5119179B2 JP2009024496A JP2009024496A JP5119179B2 JP 5119179 B2 JP5119179 B2 JP 5119179B2 JP 2009024496 A JP2009024496 A JP 2009024496A JP 2009024496 A JP2009024496 A JP 2009024496A JP 5119179 B2 JP5119179 B2 JP 5119179B2
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impeller
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悠二郎 中島
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Rinnai Corp
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Description

本発明は、主として給湯器に用いられる、流体の流れで回転する羽根車を備える流量センサに関する。   The present invention relates to a flow rate sensor including an impeller that is rotated by a fluid flow, which is mainly used in a water heater.

一般に給湯器では、熱交換器に連なる給水路に流量センサを介設し、流量センサで検出される通水流量が所定の最小流量以上になったときに、熱交換器を加熱するバーナに着火させるようにしている。   In general, in a water heater, a flow sensor is installed in a water supply line connected to the heat exchanger, and when the water flow rate detected by the flow sensor exceeds a predetermined minimum flow rate, the burner that heats the heat exchanger is ignited. I try to let them.

従来、このような給湯器に用いられる流量センサとして、羽根車を収納するセンサケースと、センサケースの入口側及び出口側に設けられ、センサケース内に羽根車を回転自在に保持する一対の軸受部材と、筒状であって、出口側の軸受部材に設けられた放射状のスポーク部に軸方向に移動自在に係合するスリットを形成すると共に、羽根車に対向する端面に、羽根車の羽根部に係合して羽根車の回転を抑止する突起を突設して成る回転抑止部材とを備えるものは知られている(例えば、特許文献１参照)。   Conventionally, as a flow sensor used in such a water heater, a sensor case that houses an impeller, and a pair of bearings that are provided on the inlet side and the outlet side of the sensor case and rotatably hold the impeller in the sensor case A slit that engages with the member and a radial spoke portion provided in the bearing member on the outlet side so as to be movable in the axial direction is formed, and a blade of the impeller is formed on an end surface facing the impeller. It is known to include a rotation inhibiting member that is formed by projecting a protrusion that engages with a portion to inhibit rotation of the impeller (see, for example, Patent Document 1).

このものでは、センサケースの入口側から出口側に向う軸方向を順方向として、センサケース内に順方向に水(流体)が流れるときに、回転抑止部材が順方向に押し動かされて、突起による羽根車の回転抑止が解除され、羽根車が回転する。一方、水抜き等でセンサケース内に出口側から入口側に向けて水が逆流するときは、回転抑止部材が順方向とは反対方向、即ち、羽根車に接近する方向に押し動かされて、突起により羽根車の回転が抑止される。これにより、水の逆流時にバーナに着火することを防止できる。   In this case, when the axial direction from the inlet side to the outlet side of the sensor case is the forward direction, when water (fluid) flows in the forward direction in the sensor case, the rotation restraining member is pushed forward and the protrusion The rotation suppression of the impeller due to is released, and the impeller rotates. On the other hand, when water flows backward from the outlet side to the inlet side in the sensor case due to drainage or the like, the rotation suppression member is pushed in the direction opposite to the forward direction, that is, the direction approaching the impeller, The rotation of the impeller is suppressed by the protrusion. Thereby, it can prevent that a burner is ignited at the time of backflow of water.

また、従来、羽根車の羽根部を軸方向に平行とし、入口側軸受部材に、軸方向に対し傾斜した斜状案内羽根を設けて、センサケース内に流体が順方向に流れるときに、斜状案内羽根により流体の流れが旋回流となって羽根車に回転力が付与されるようにした流量センサも知られている(例えば、特許文献２参照)。このものでは、逆流時には出口側から流入する流体に旋回運動が与えられないため、羽根車は回転しないとしている。然し、実際には、斜状案内羽根における流体の旋回の影響が羽根車の配置部にまで及び、羽根車が正転方向や逆転方向に回転してしまうことがある。従って、このものでも、上記従来例のような回転抑止部材を付設して、逆流時の羽根車の回転を防止することが必要になる。   Conventionally, the blade portion of the impeller is parallel to the axial direction, and the inlet-side bearing member is provided with an oblique guide vane inclined with respect to the axial direction. When the fluid flows in the forward direction in the sensor case, There is also known a flow rate sensor in which a fluid flow is turned into a swirl flow by a guide blade and a rotational force is applied to the impeller (see, for example, Patent Document 2). In this case, since the swirling motion is not given to the fluid flowing in from the outlet side during the reverse flow, the impeller is not rotated. However, in reality, the influence of the swirling of the fluid on the oblique guide vane extends to the arrangement part of the impeller, and the impeller may rotate in the forward rotation direction or the reverse rotation direction. Therefore, it is necessary to prevent the rotation of the impeller at the time of backflow by providing a rotation inhibiting member as in the above-described conventional example.

ところで、流量センサは、一般的に、センサケースの入口側を下方、出口側を上方に向けた起立姿勢で配置される。この場合、回転抑止部材をその重量に抗して押し上げるにはある程度の流量が必要になり、この流量以下では羽根車の回転が抑止されたままになって、感度が悪くなる。そこで、上記特許文献１記載のものでは、突起をその下端から逆転方向に向けて上方に傾斜してのびるカム部を有するものに形成している。これによれば、順方向(下方から上方)に流体が流れて羽根車に正転方向の回転力が付与されると、羽根車の羽根部がカム部に当接したところで、正転方向への回転力によりカム部を介して回転抑止部材に上方への推力が作用する。そして、この推力により回転抑止部材の押し上げがアシストされて、比較的小流量でも回転抑止部材による羽根車の回転抑止が解除され、感度が向上する。   By the way, the flow sensor is generally arranged in a standing posture with the inlet side of the sensor case facing downward and the outlet side facing upward. In this case, a certain amount of flow is required to push up the rotation suppression member against its weight, and below this flow rate, the rotation of the impeller remains suppressed and the sensitivity is deteriorated. Therefore, in the thing of the said patent document 1, the protrusion is formed in what has a cam part which inclines upwards toward the reverse rotation direction from the lower end. According to this, when the fluid flows in the forward direction (from the lower side to the upper side) and the rotational force in the forward direction is applied to the impeller, the forward direction is changed when the blade portion of the impeller contacts the cam portion. Due to this rotational force, an upward thrust acts on the rotation restraining member via the cam portion. The thrust assists the push-up of the rotation restraining member, and the rotation restraining of the impeller by the rotation restraining member is released even at a relatively small flow rate, thereby improving the sensitivity.

然し、突起にカム部を形成すると、止水時に、羽根車が慣性で正転することを抑止できなくなり、止水の検出応答性が悪くなる。その結果、流量センサを給湯器に使用した場合、止水時にバーナを応答性良く消火できなくなる。   However, if the cam portion is formed on the protrusion, it becomes impossible to prevent the impeller from rotating forward due to inertia during water stoppage, and the detection response of water stoppage becomes worse. As a result, when the flow sensor is used in a water heater, the burner cannot be extinguished with good responsiveness when the water stops.

実開平２−７９４２３号公報Japanese Utility Model Publication No. 2-79423 特開昭６４−２３１１８号公報JP-A-64-23118

本発明は、以上の点に鑑み、止水の検出応答性の悪化を生ずることなく、感度を向上できるようにした流量センサを提供することをその課題としている。   This invention makes it the subject to provide the flow sensor which enabled it to improve a sensitivity, without producing the deterioration of the stop response of water stop in view of the above point.

上記課題を解決するために、本発明は、流体の流れで回転する羽根車を備える流量センサであって、羽根車を収納するセンサケースと、センサケースの入口側及び出口側に設けられ、センサケース内に羽根車を回転自在に保持する一対の軸受部材と、筒状であって、出口側の軸受部材に設けられた放射状のスポーク部に軸方向に移動自在に係合するスリットを形成すると共に、羽根車に対向する端面に、羽根車の羽根部に係合して羽根車の回転を抑止する突起を突設して成る回転抑止部材とを備えるものにおいて、羽根車の羽根部は軸方向に平行であって、入口側の軸受部材に、入口側から流入する流体の流れを旋回流にする、軸方向に対し傾斜した斜状案内羽根が設けられ、突起は、羽根車の正逆何れの方向の回転も抑止できるように、周方向両側面が軸方向に平行に形成され、回転抑止部材の材質はＰＰＥ又はＰＰＯであって、回転抑止部材に、径方向に張出す張出し部が形成されていることを特徴とする。 In order to solve the above-described problems, the present invention is a flow rate sensor including an impeller that rotates with the flow of a fluid, the sensor case housing the impeller, the sensor case provided on the inlet side and the outlet side, A pair of bearing members that rotatably hold the impeller in the case and a cylindrical slit that engages radially with spoke portions provided on the bearing member on the outlet side so as to be movable in the axial direction are formed. And an anti-rotation member formed on the end surface facing the impeller by projecting a protrusion that engages with the impeller blade portion and inhibits the rotation of the impeller. Inclined guide blades that are parallel to the direction and inclined with respect to the axial direction are provided on the bearing member on the inlet side to make the flow of the fluid flowing in from the inlet side swirl. To prevent rotation in either direction, Direction both side surfaces are formed parallel to the axial direction, the material of the rotation inhibiting member is a PPE or PPO, the rotation inhibiting member, wherein the overhang out radially Zhang is formed.

本発明によれば、突起が羽根車の正転も抑止できるように形成されているため、止水時に羽根車が慣性で正転することを抑止できる。従って、止水の検出応答性が良くなる。また、張出し部が流体圧を受ける受圧部となって、順方向に流体が流れるときや逆流時に回転抑止部材に作用する順方向や反対方向への押圧力が張出し部の面積分増強され、比較的小流量であっても、流体の流れ方向に応じて回転抑止部材が動く。従って、順方向に流体が流れるときは、比較的小流量から羽根車が回転して、感度が向上し、また、逆流時に羽根車が回転することを確実に防止できる。   According to the present invention, since the projection is formed so as to prevent forward rotation of the impeller, it is possible to prevent the impeller from rotating forward due to inertia when the water stops. Accordingly, the detection response of water stoppage is improved. In addition, the overhanging part becomes a pressure receiving part that receives fluid pressure, and the forward and reverse pressing force acting on the rotation suppression member when the fluid flows in the forward direction or in the reverse flow is increased by the area of the overhanging part. Even if the flow rate is small, the rotation restraining member moves according to the fluid flow direction. Therefore, when the fluid flows in the forward direction, the impeller rotates from a relatively small flow rate to improve the sensitivity, and it is possible to reliably prevent the impeller from rotating during reverse flow.

ところで、流量センサは、一般的に、センサケースの入口側を下方、出口側を上方に向けた起立姿勢で配置される。この場合、張出し部は、回転抑止部材の下部に形成されていることが望ましい。これによれば、回転抑止部材の重心位置が低くなって、回転抑止部材が安定する。その結果、流体が下方から上方に向けて順方向に流れたとき、回転抑止部材が傾くことなく押し上げられ、突起による羽根車の回転抑止が確実に解除される。   By the way, the flow sensor is generally arranged in a standing posture with the inlet side of the sensor case facing downward and the outlet side facing upward. In this case, it is desirable that the overhang portion is formed at the lower portion of the rotation restraining member. According to this, the position of the center of gravity of the rotation suppression member is lowered, and the rotation suppression member is stabilized. As a result, when the fluid flows in the forward direction from the lower side to the upper side, the rotation suppression member is pushed up without tilting, and the rotation suppression of the impeller by the protrusion is reliably released.

本発明の実施形態の流量センサの切断側面図。The cut | disconnection side view of the flow sensor of embodiment of this invention. 実施形態の流量センサの分解斜視図。The disassembled perspective view of the flow sensor of an embodiment. 実施形態の流量センサの回転抑止部材の下端部の展開図。The expanded view of the lower end part of the rotation suppression member of the flow sensor of the embodiment.

図１は本発明の実施形態の流量センサを示している。この流量センサは、給湯器の熱交換器に連なる給水路に介設されるものであり、流量センサで検出した通水流量が所定の最低流量以上になったときに、熱交換器を加熱するバーナに着火される。   FIG. 1 shows a flow sensor according to an embodiment of the present invention. This flow sensor is provided in a water supply channel connected to the heat exchanger of the water heater, and heats the heat exchanger when the water flow rate detected by the flow sensor exceeds a predetermined minimum flow rate. The burner is ignited.

流量センサは、筒状のセンサケース１と、センサケース１内に収納される羽根車２と、センサケース１の入口側と出口側に設けられ、羽根車２をセンサケース１内で回転自在に保持する一対の軸受部材３，４と、出口側軸受部材４に装着される回転抑止部材５とを主要部材として構成されている。尚、流量センサは、センサケース１の入口側を下方、出口側を上方に向けた起立姿勢で設置される。   The flow rate sensor is provided on the cylindrical sensor case 1, the impeller 2 accommodated in the sensor case 1, and the inlet side and the outlet side of the sensor case 1, so that the impeller 2 can rotate freely in the sensor case 1. A pair of bearing members 3 and 4 to be held and a rotation restraining member 5 mounted on the outlet side bearing member 4 are configured as main members. The flow rate sensor is installed in an upright posture with the inlet side of the sensor case 1 facing downward and the outlet side facing upward.

羽根車２は、軸方向(上下方向)に長手の筒状の胴体部２１と、胴体部２１に貫通させた回転軸２２と、胴体部２１の外周面に放射状に配置した、磁気を帯びた複数の羽根部２３とを有している。図示しないが、センサケース１の外面にはホール素子等から成る磁気センサが設置されており、各羽根部２３が磁気センサに対向する位置を通過する度に磁気センサからパルスが出力される。そして、単位時間当たりの出力パルス数をカウントして、通水流量を検出する。   The impeller 2 is magnetized with a cylindrical body portion 21 that is long in the axial direction (vertical direction), a rotating shaft 22 that penetrates the body portion 21, and a radially disposed outer peripheral surface of the body portion 21. And a plurality of blade portions 23. Although not shown, a magnetic sensor composed of a Hall element or the like is installed on the outer surface of the sensor case 1, and a pulse is output from the magnetic sensor every time each blade 23 passes a position facing the magnetic sensor. Then, the number of output pulses per unit time is counted to detect the water flow rate.

入口側軸受部材３は、センサケース１に一体成形されるもので、羽根車２の回転軸２２の下端部を挿入保持する筒状の軸受部３１と、図２に示す如く、軸受部３１から外方に放射状にのびる、軸方向に対し傾斜した複数の斜状案内羽根３２とを有している。この斜状案内羽根３２により、センサケース１内に入口側から流入する水(流体)の流れが旋回流となる。ここで、羽根車２の羽根部２３は軸方向に平行であるが、旋回流によって羽根車２に回転力が付与される。   The inlet-side bearing member 3 is formed integrally with the sensor case 1, and includes a cylindrical bearing portion 31 for inserting and holding the lower end portion of the rotating shaft 22 of the impeller 2, and a bearing portion 31 as shown in FIG. A plurality of oblique guide vanes 32 extending radially outward and inclined with respect to the axial direction are provided. By the inclined guide vanes 32, the flow of water (fluid) flowing into the sensor case 1 from the inlet side becomes a swirling flow. Here, the blade portion 23 of the impeller 2 is parallel to the axial direction, but rotational force is applied to the impeller 2 by the swirling flow.

出口側軸受部材４は、羽根車２の回転軸２２の上端部を挿入保持する筒状の軸受部４１と、センサケース１の上端部に嵌合固定される環状のリム部４２と、軸受部４１とリム部４２との間に放射状に配置した複数のスポーク部４３とを有している。   The outlet side bearing member 4 includes a cylindrical bearing portion 41 that inserts and holds the upper end portion of the rotating shaft 22 of the impeller 2, an annular rim portion 42 that is fitted and fixed to the upper end portion of the sensor case 1, and a bearing portion. 41 and a plurality of spoke portions 43 arranged radially between the rim portion 42.

回転抑止部材５は、筒状であって、その上半部には、出口側軸受部材４の複数のスポーク部４３に夫々軸方向に移動自在に係合する複数のスリット５１が形成されている。また、回転抑止部材５の羽根車２に対向する下端面には、羽根車２の羽根部２３に係合して羽根車２の回転を抑止する突起５２が複数突設されている。   The rotation suppression member 5 has a cylindrical shape, and a plurality of slits 51 are formed in the upper half of the rotation suppression member 5 so as to engage with the plurality of spoke portions 43 of the outlet side bearing member 4 movably in the axial direction. . In addition, a plurality of protrusions 52 that engage with the blade portion 23 of the impeller 2 and inhibit the rotation of the impeller 2 are provided on the lower end surface of the rotation inhibiting member 5 facing the impeller 2.

各突起５２の周方向両側面５２ａ，５２ｂは、図３に示す如く、軸方向(上下方向)に平行に形成されている。そのため、回転抑止部材５が下降している状態では、羽根車２の正転方向の回転が突起５２の周方向一側面５２ａへの羽根部２３の係合で抑止されると共に、羽根車２の逆転方向への回転が突起５２の周方向他側面５２ｂへの羽根部２３の係合で抑止される。   As shown in FIG. 3, both circumferential side surfaces 52a and 52b of each protrusion 52 are formed in parallel to the axial direction (vertical direction). Therefore, in the state where the rotation suppression member 5 is lowered, the rotation of the impeller 2 in the forward rotation direction is suppressed by the engagement of the blade portion 23 with the circumferential side surface 52a of the protrusion 52, and the impeller 2 The rotation in the reverse direction is suppressed by the engagement of the blade portion 23 with the other circumferential side surface 52 b of the protrusion 52.

ここで、センサケース１の入口側から出口側に向う軸方向を順方向として、センサケース１内に水が順方向に流れるときは、回転抑止部材５が、図１に示す如く、その下端面に作用する水圧により順方向、即ち、上方に押し動かされ、突起５２による羽根車２の回転抑止が解除されて、羽根車２が正転する。また、止水時には、羽根車２に当接する位置まで回転抑止部材５が下降する。そして、突起５２が羽根車２の正転も抑止できるように形成されているため、止水時に羽根車２が慣性で正転することを抑止できる。従って、止水の検出応答性が良くなり、止水時にバーナを応答性良く消火できる。   Here, when water flows in the sensor case 1 in the forward direction with the axial direction from the inlet side to the outlet side of the sensor case 1 as the forward direction, the rotation restraining member 5 has its lower end surface as shown in FIG. The forward pressure, that is, the upward movement of the impeller 2 is canceled by the water pressure acting on the impeller 2, so that the rotation of the impeller 2 by the protrusion 52 is released, and the impeller 2 rotates forward. Further, at the time of water stoppage, the rotation suppression member 5 is lowered to a position where it abuts on the impeller 2. And since the protrusion 52 is formed so that forward rotation of the impeller 2 can also be suppressed, it is possible to prevent the impeller 2 from rotating forward due to inertia when the water stops. Therefore, the detection response of the water stop is improved, and the burner can be extinguished with a high response when the water stops.

水抜き等でセンサケース１内に出口側から入口側に向けて水が逆流するときは、回転抑止部材５がその上端面に作用する水圧で下方に押され、突起５２が羽根部２３に係合して、羽根車２の回転が抑止される。これにより、水の逆流時にバーナに着火することを防止できる。尚、水の逆流時には、羽根車２に然程大きな回転力は付与されないが、斜状案内羽根３２における水の旋回の影響が斜状案内羽根３２の配置部よりも上方部分に及び、羽根車２に回転力が付与されてしまう。従って、水の逆流時に突起５２によって羽根車２の回転を抑止することが必要になる。   When water flows backward from the outlet side to the inlet side in the sensor case 1 due to draining or the like, the rotation inhibiting member 5 is pushed downward by the water pressure acting on the upper end surface thereof, and the protrusion 52 is engaged with the blade portion 23. In combination, the rotation of the impeller 2 is suppressed. Thereby, it can prevent that a burner is ignited at the time of backflow of water. In addition, at the time of reverse flow of water, the impeller 2 is not applied with such a large rotational force, but the influence of the swirling of the water on the oblique guide vane 32 extends to the upper part of the arrangement portion of the oblique guide vane 32 and the impeller. A rotational force is applied to 2. Therefore, it is necessary to suppress the rotation of the impeller 2 by the protrusion 52 at the time of reverse flow of water.

ところで、水が順方向に流れるときに、回転抑止部材５の下端面に作用する水圧だけでは、回転抑止部材５をその重量に抗して押し上げるのに必要な流量が比較的大きくなり、この流量以下では回転抑止部材５を押し上げることができず、羽根車２の回転が抑止されたままになって、感度が悪くなる。そこで、本実施形態では、回転抑止部材５の下部に径方向外方に張出すフランジ状の張出し部５３を形成している。   By the way, when water flows in the forward direction, only the water pressure acting on the lower end surface of the rotation suppression member 5 causes a relatively large flow rate to push the rotation suppression member 5 against its weight. In the following, the rotation suppression member 5 cannot be pushed up, and the rotation of the impeller 2 remains suppressed, resulting in poor sensitivity. Therefore, in the present embodiment, a flange-like projecting portion 53 projecting outward in the radial direction is formed in the lower portion of the rotation restraining member 5.

これによれば、張出し部５３が水圧を受ける受圧部となって、順方向に水が流れるときや逆流時に回転抑止部材５に作用する上方や下方への押圧力が張出し部５３の面積分増強され、比較的小流量であっても、水の流れ方向に応じて回転抑止部材５が動く。従って、順方向に水が流れるときは、比較的小流量から羽根車２が回転して、感度が向上し、また、逆流時に羽根車２が回転することを確実に防止できる。   According to this, the overhanging portion 53 becomes a pressure receiving portion that receives water pressure, and the upward or downward pressing force that acts on the rotation suppression member 5 when water flows in the forward direction or in the reverse flow is increased by the area of the overhanging portion 53. Even if the flow rate is relatively small, the rotation restraining member 5 moves according to the flow direction of water. Therefore, when water flows in the forward direction, the impeller 2 rotates from a relatively small flow rate to improve sensitivity, and it is possible to reliably prevent the impeller 2 from rotating during backflow.

尚、張出し部５３を回転抑止部材５の上部に形成することも可能である。然し、この場合には、回転抑止部材５の重心位置が高くなって、回転抑止部材５が不安定になり、押し上げ時に回転抑止部材５が傾き易くなる。そして、回転抑止部材５の傾きにより、スリット５１の側縁とスポーク部４３とのこじりを生じ、回転抑止部材５の押し上げが妨げられることがある。これに対し、張出し部５３を本実施形態のように回転抑止部材５の下部に形成すれば、回転抑止部材５の重心位置が低くなって、回転抑止部材５が安定する。その結果、水が順方向に流れたとき、回転抑止部材５が傾くことなくスムーズに押し上げられ、羽根車２の回転抑止が確実に解除される。   It is also possible to form the overhang portion 53 on the upper portion of the rotation restraining member 5. However, in this case, the position of the center of gravity of the rotation suppression member 5 becomes high, the rotation suppression member 5 becomes unstable, and the rotation suppression member 5 is easily inclined when pushed up. Then, the inclination of the rotation suppression member 5 may cause a side edge of the slit 51 and the spoke portion 43 to be twisted, thereby preventing the rotation suppression member 5 from being pushed up. On the other hand, if the overhang | projection part 53 is formed in the lower part of the rotation suppression member 5 like this embodiment, the gravity center position of the rotation suppression member 5 will become low, and the rotation suppression member 5 will be stabilized. As a result, when water flows in the forward direction, the rotation suppression member 5 is pushed up smoothly without tilting, and the rotation suppression of the impeller 2 is reliably released.

また、本実施形態では、回転抑止部材５の材質を比重が水に近いもの、例えば、ＰＰＥやＰＰＯ(比重約１．０９)としている。これによれば、張出し部５３の張出し量を小さくしても、小流量で回転抑止部材５が押し上げられる。そして、張出し部５３の張出し量を小さくすることで、圧損を低減することができる。   In this embodiment, the material of the rotation suppression member 5 is a material having a specific gravity close to that of water, for example, PPE or PPO (specific gravity is about 1.09). According to this, even if the overhang amount of the overhang portion 53 is reduced, the rotation suppression member 5 is pushed up with a small flow rate. The pressure loss can be reduced by reducing the overhang amount of the overhang portion 53.

以上、本発明の実施形態について図面を参照して説明したが、本発明はこれに限定されない。例えば、上記実施形態では、回転抑止部材５に径方向外方に張出す張出し部５３を形成したが、出口側軸受部材４の軸受部４１の下端と羽根車２の羽根部２３の上端との距離をある程度長くすれば、回転抑止部材５の下部に径方向内方に張出すように張出し部を形成することも可能である。また、上記実施形態では、入口側軸受部材３に斜状案内羽根３２を設けて、通水時に旋回流を生じさせるようにしたが、羽根車２の羽根部２３を軸方向に対し傾斜させれば、旋回流を生じさせなくても羽根車２は回転するから、斜状案内羽根３２は必要不可欠ではない。   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 above-described embodiment, the overhanging portion 53 that projects radially outward is formed on the rotation suppression member 5, but the lower end of the bearing portion 41 of the outlet side bearing member 4 and the upper end of the blade portion 23 of the impeller 2 are formed. If the distance is increased to some extent, it is also possible to form an overhanging portion so as to protrude radially inward at the lower part of the rotation inhibiting member 5. Moreover, in the said embodiment, although the inclined guide blade 32 was provided in the inlet side bearing member 3, and the swirl | vortex flow was produced at the time of water flow, the blade | wing part 23 of the impeller 2 can be inclined with respect to an axial direction. For example, since the impeller 2 rotates without generating a swirling flow, the oblique guide blade 32 is not indispensable.

また、上記実施形態は、流体として水を流す給湯器用の流量センサに本発明を適用したものであるが、給湯器以外の装置で使用する流量センサにも同様に本発明を適用できる。   Moreover, although the said embodiment applies this invention to the flow sensor for the hot water heater which flows water as a fluid, this invention is applicable similarly to the flow sensor used with apparatuses other than a water heater.

１…センサケース、２…羽根車、２３…羽根部、３…入口側軸受部材、４…出口側軸受部材、４３…スポーク部、５…回転抑止部材、５１…スリット、５２…突起、５３…張出し部。   DESCRIPTION OF SYMBOLS 1 ... Sensor case, 2 ... Impeller, 23 ... Blade | wing part, 3 ... Inlet side bearing member, 4 ... Outlet side bearing member, 43 ... Spoke part, 5 ... Rotation suppression member, 51 ... Slit, 52 ... Protrusion, 53 ... Overhang part.

Claims (2)

流体の流れで回転する羽根車を備える流量センサであって、
羽根車を収納するセンサケースと、センサケースの入口側及び出口側に設けられ、センサケース内に羽根車を回転自在に保持する一対の軸受部材と、筒状であって、出口側の軸受部材に設けられた放射状のスポーク部に軸方向に移動自在に係合するスリットを形成すると共に、羽根車に対向する端面に、羽根車の羽根部に係合して羽根車の回転を抑止する突起を突設して成る回転抑止部材とを備えるものにおいて、
羽根車の羽根部は軸方向に平行であって、入口側の軸受部材に、入口側から流入する流体の流れを旋回流にする、軸方向に対し傾斜した斜状案内羽根が設けられ、
突起は、羽根車の正逆何れの方向の回転も抑止できるように、周方向両側面が軸方向に平行に形成され、
回転抑止部材の材質はＰＰＥ又はＰＰＯであって、回転抑止部材に、径方向に張出す張出し部が形成されていることを特徴とする流量センサ。 A flow sensor comprising an impeller rotating with a fluid flow,
A sensor case that houses the impeller, a pair of bearing members that are provided on the inlet side and the outlet side of the sensor case and rotatably hold the impeller in the sensor case, and a cylindrical bearing member on the outlet side Protrusions that engage with the impeller blades and prevent rotation of the impeller on the end surface facing the impeller, while forming slits that engage with the radial spokes provided in the shaft so as to be movable in the axial direction. With a rotation inhibiting member formed by projecting
The blade portion of the impeller is parallel to the axial direction, and an inclined guide blade inclined with respect to the axial direction is provided in the bearing member on the inlet side to make the flow of fluid flowing from the inlet side swirl,
The protrusions are formed so that both sides in the circumferential direction are parallel to the axial direction so that rotation in either the forward or reverse direction of the impeller can be suppressed.
A material for the rotation restraining member is PPE or PPO, and an overhanging portion projecting in the radial direction is formed on the rotation restraining member. 請求項１記載の流量センサであって、前記センサケースの入口側を下方、出口側を上方に向けた起立姿勢で配置されるものにおいて、
前記張出し部は、前記回転抑止部材の下部に形成されていることを特徴とする請求項１記載の流量センサ。 The flow sensor according to claim 1, wherein the sensor case is arranged in a standing posture with the inlet side facing downward and the outlet side facing upward.
The flow sensor according to claim 1, wherein the projecting portion is formed at a lower portion of the rotation suppression member.
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