JP3136098B2 - Flow sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow sensor of the type for detecting the flow rate of a liquid such as water using a rotor, which is rotated by a fixed guide blade provided on a body and a blade plate provided on the rotor. The present invention relates to an improvement in a flow sensor configured to rotate a child.

[0002]

2. Description of the Related Art A flow sensor, which detects a flow rate by rotating a rotor in accordance with a flow rate of a liquid by a blade receiving a flow of the liquid, detects liquid flowing straight from an upstream side. A method in which the rotor is rotated by hitting the blade plate of a twisting blade provided in the rotor, and a liquid that travels straight, is swirled by fixed guide blades that are fixedly provided in the body, There is a method in which a rotor is rotated by obliquely contacting a blade provided on the rotor.

[0003]

Among the flow rate sensors using the rotor of the above-described type, a flow rate sensor having a fixed guide blade provided on the body and a blade plate provided on the rotor has been conventionally used. It is necessary to form guide blades fixed to the body on the twist blade so that liquid such as water coming straight from the upstream side may obliquely collide with the blade plate provided on the rotor. Therefore, there is a problem that the processing of the guide vanes is troublesome, and the production of a mold for molding the guide vanes becomes expensive.

SUMMARY OF THE INVENTION The present invention has been made to solve this problem which has occurred in the conventional means, and the guide vanes fixed to the body and the vanes provided on the peripheral surface of the rotor are formed in a straight plate shape. Meanwhile, a flow of liquid such as water coming straight from the upstream side is obliquely applied to the rotor slats, so that a new flow sensor using the above-described rotor can be manufactured at low cost. It is intended to provide a means.

[0005]

According to the present invention, as a means for achieving the above-mentioned object, a reduced diameter portion 10 is formed in the middle of a body 1 formed in a cylindrical shape, and the reduced diameter portion is formed. A dam plate 7 having a diameter substantially corresponding to the inner diameter of the reduced-diameter portion 10 is disposed at a central portion on the upstream side, which is on the rear end side from 10, and the dam plate 7 and the upstream portion of the reduced-diameter portion 10 are arranged. An annular flow path W that radially expands the upstream flow path Y in the body 1 is formed between the end face and the end face. Inside the annular flow path W, a straight plate-shaped radially protruding peripheral surface is formed. Rotor 3 provided with blades 31.
Are axially supported along the axial direction of the body 1, and a plurality of straight guide vanes 24... And fixedly mounted on the body 1, and the guide vanes 24.
Guide vane 24 in the rotation direction of the rotor 3
And a water inlet a that connects the annular flow path W to the peripheral surface of the rotor 3 is formed between the rotor and the rear guide vane 24. A reduced diameter portion 10 is formed at an intermediate portion in the axial direction of the formed body 1, and a cylindrical case 2 is formed on the inner peripheral side of the reduced diameter portion 10.
The rear half of the upstream side of the body 1 is the reduced diameter portion 10.
Is provided so as to protrude rearward, and a straight plate-like blade plate 3 protruding radially on the peripheral surface is provided at a portion approaching rearward in the case 2.
The storage shaft is mounted on the rotor 3 provided with 1... With the axial direction along the axial direction of the body 1, and the rear end of the case 2 has a diameter substantially corresponding to the inner diameter of the reduced diameter portion 10. An annular flow path W surrounding the outer periphery of the rotor 3 is provided between the weir plate 7 and the rear surface of the reduced-diameter portion 10 by mounting the weir plate 7,
A plurality of straight guide vanes 24 are formed in the annular flow passage W so as to be connected to the front end of the flow passage Y on the upstream side in the body 1. Then, it is fixedly mounted on the body 1 and the plurality of guide vanes 24.
Are formed between the front guide vane 24 and the rear guide vane 24 in the rotation direction of the rotor 3 in order to allow the annular flow path W to communicate with the peripheral surface of the rotor 3. It is intended to provide a flow sensor characterized by the above.

[0006]

The means of the present invention constructed as described above provides a flow path W surrounding the outer circumference of the outer edge of the blades 31 of the rotor 3 in a ring shape at a portion surrounding the outer periphery of the rotor 3 in the body 1. , And fixed guide vanes 24... Formed in the shape of a straight plate inclined in the tangential direction with respect to the rotation locus of the outer edge of the blade plates 31. By arranging the rotor 32 in a tomical shape when viewed in the axial direction of 32, the flow of liquid such as water flowing in the body 1 from the upstream side along the axial direction of the body 1 supports the rotor 3. Of the rotor 3 of the rotor 3, flows into an annular flow path W formed on the outer peripheral side of the rotation trajectory of the outer edge of the blades 31. , And from there, it flows into the space between the blades 31 of the rotor 3, and flows through the space to the downstream side of the body 1. Comprising go way.

At this time, the rotor 3
When viewed in the axial direction of the rotary shaft 32, the liquid flowing into the flow path W is caused by the fixed guide blades 24... The blades 31 of the rotor 3 are guided in a direction along the tangential direction of the rotor 3 and formed obliquely with respect to the axis of the rotor 3 in a straight plate shape.
, And pushes the blades 31 in the direction in which the rotor 3 is rotated.

For this reason, the guide blades 24 fixed to the body 1 and the blade plate 31 of the rotor 3 are formed in a straight plate shape, and the flow flowing from the upstream side to the downstream side in the body 1 is controlled. , The blades 31 of the rotor 3 when viewed in the axial direction of the rotation shaft 32 of the rotor 3.
And the rotor 3 can be rotated.

[0009]

Next, an embodiment will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional side view of a flow sensor A embodying the present invention in a state before a downstream (left end side in the figure) joint pipe B is assembled. In FIG. , 2
Is a case fitted in the inner cavity of the body 1 in the form of an inner cylinder, 3 is a rotor supported on the inner cavity of the inner cylindrical case 2, 4 is a magnet attached to the rotor 3, 5 is a body 1 shows a magnetic sensor attached to the outer periphery of No. 1.

The body 1 is provided with a constricted portion 1a having a small diameter at an intermediate portion in the axial direction, and an inner peripheral side of the constricted portion 1a is formed in a shaft cylindrical shape formed in a reduced diameter portion 10. Are open on the upstream side (right end side in the figure) and on the downstream side (left end side in the figure) as opening ports 1b and 1c, respectively.

[0011] A joint pipe B having an outer diameter corresponding to the inner diameter of the body 1 is water-tightly connected via an O-ring 60 to each of the upstream and downstream open ports 1b and 1c. Mated. Each of the joint pipes B connected to and attached to the upstream side and the downstream side of the body 1 is formed in the same shape, and the axial direction thereof is reversed, and each is connected to the right end side in FIG. As shown, a flange 61 provided on the outer periphery on the base end side is provided with an opening 1b
By pressing it until it abuts on the opening edge of c, it is connected and fitted, and in this state, it is maintained in a state of being connected in a watertight manner by an O-ring 60 mounted on the outer periphery of a portion closer to the base end side than the flange portion 61. Is done.

The case 2, which is mounted in the inner cavity of the body 1 in the form of an inner cylinder, is formed of a synthetic resin material into a shape as shown in FIGS. The front half of the case 2 facing the downstream side of the body 1 is, as shown in FIG.
The cylindrical portion 20 is fitted to the inner peripheral surface of the reduced diameter portion 10 formed at the axially intermediate portion of the body 1 and has a front end portion shown in FIGS. As shown in the figure, harpoon-shaped engaging projections 21 are formed.

The cylindrical portion 20 which is the first half side of the case 2
Is inserted from the upstream side of the body 1 and pushed into the inside of the reduced diameter portion 10 so as to be fitted, so that the above-mentioned engagement protrusions 21 project to the front surface (downstream end surface) of the reduced diameter portion 10. As a result, the return to the upstream side is prevented by the engagement protrusions 21..., And the state is integrally fixed to the inner peripheral surface of the reduced diameter portion 10.

At the front end of the cylindrical portion 20 of the case 2,
As shown in FIG. 3 and FIG.
A bearing support member 22 for supporting a bearing that supports the rotary shaft 32 is provided, and is integrally connected to the cylindrical portion 20 by rectifying plates 23 radially protruding from the peripheral surface thereof. .

When the cylindrical portion 20 of the case 2 is fitted into the reduced diameter portion 10 of the body 1, the rear half of the case 2 projecting rearward from the reduced diameter portion 10 is shown in FIG. As described above, in a rear view, the five straight plate-shaped guide vanes 24 which are in a posture orthogonal to the virtual line Z extending in the radial direction from the axis of the cylindrical portion 20 are positioned from the position where the cylindrical portion 20 is equally distributed. Projecting in the outer peripheral direction along the tangential direction of the cylindrical portion 20, the outer end serving as the protruding end is provided so as to abut against the inner peripheral surface of the body 1, and the guide blades 24.
The front edge side of the inner end thereof is integrally continuous with the rear edge of the cylindrical portion 20, whereby the cylindrical portion 20 is fitted to the inner peripheral surface of the reduced diameter portion 10 of the body 1 and fixed to the body 1. As a result, the guide blades 24... Are fixed to the body 1 via the cylindrical portion 20.

The guide blades 24 are provided on the cylindrical portion 2.
0, except that an inner end portion that is continuous with the rear end edge is formed so that an outer end side facing the outer peripheral direction protrudes into free space therefrom. A passage that extends radially is formed between the guide vane 24 and the second guide vane 24, and the passage forms a water inlet a that faces the rotor 3 provided in the case 2.

As shown in FIGS. 3 and 4, the rear end of the guide blades 24... Has a front end projecting toward the axial center of the case 2 in rear view and a harpoon projecting rearward in side view. Engagement protrusions 25 are provided respectively.

The rear side of the guide blades 24 forming the rear half of the case 2 has an outer diameter substantially corresponding to the outer diameter of the cylindrical portion 20, and as shown in FIG. The pentagon-shaped weir plate 7 is brought into contact with the cylindrical portion 20 so as to close the rear portion thereof, and the harpoon-shaped engaging protrusions 25.
By this, it is assembled to the rear end side of the case 2.

Thus, an annular flow path W surrounding the rear half of the case 2 is formed in the inner cavity of the body 1 between the dam plate 7 and the rear surface of the reduced diameter portion 10 of the body 1. When the flow of the liquid flowing from the upstream side through the flow path Y in the body 1 formed by the lumen of the joint pipe B on the upstream side reaches the position where the liquid collides with the weir plate 7. As shown by the arrows in FIG. 1, the radially expanded portion flows into the annular flow passage W, flows into the inner cavity of the case 2 via the flow passage W, and flows into the downstream joint pipe B. It is going to pass.

The guide vanes 24 formed on the rear half side of the case 2 are located in the annular flow passage W as shown in FIG.
As shown by arrows in FIG. 8, the flow of water flowing into the annular flow path W is transmitted from a water inlet a formed by a space between guide vanes 24. To the lumen.

As shown in FIGS. 9 to 12, the rotor 3 which is pivotally supported in the case 2 is made of a synthetic resin material, and is formed of four straight plate-like blades from the peripheral surface of the shaft cylindrical boss portion 30. Are formed by forming a rotating body 3a projecting in a cross shape when viewed in the axial direction, and penetrating a rotating shaft 32 made of a metal material into a boss portion 30 of the rotating body 3a. At the front edges of the pair of blade plates 31, engagement protrusions 33 are provided for engaging with the magnet 4, and the rotation shaft 32 made of a metal material projects from the boss 30. A fall prevention claw 34 is attached to the front end side of the vehicle.

The magnet 4 attached to the rotor 3
As shown in FIGS. 13 to 16, when viewed in the axial direction, it is formed in a cross shape that overlaps with the rotating body 3 a made of the above-mentioned synthetic resin material, and a shaft fitting with the rotating shaft 32 A hole 40 is formed, and the rotating body 3 is provided on the rear side.
a, engaging recesses 41, 41 for fitting with the engaging projections 33, 33 of the pair of blade plates 31, 31, and engaging recesses 42, 42 for fitting the fall prevention claws 34 provided on the rotary shaft 32. It is shaped.

The magnet 4 has its shaft hole 40 inserted into the rotating shaft 32 from the front end thereof, and the engaging recesses 41... 42 are inserted into the engaging protrusions 33. By being firmly fitted, the rotor 3 is integrally assembled.

The polarity of the magnet 4 is such that an N pole, an N pole, an S pole and an S pole exist at four rod-shaped projecting portions as shown in FIG.

The rotor 3 to which the magnet 4 is attached is inserted into the case 2 from the rear side before the weir plate 7 is attached to the case 2 fitted in the body 1, and the rotating shaft 3
2 is supported by a bearing support member 22 provided on the front end side of the case 2 via a bearing, and a rear end of the rotary shaft 32 is provided at a shaft center portion of the weir plate 7. By assembling the cover plate 7 on the rear surface side of the case 2 while supporting the case 70 via a bearing, the cover plate 7 is rotatably supported in the case 2.

Thus, the flow of water (liquid) flowing from the upstream side of the body 1 flows into the annular flow path W, where the water (liquid) is fixed in a tubular shape when viewed in the axial direction. As shown in FIG. 17, the flow guided by the guide blades 24... Into the case 2 is displaced obliquely with respect to the rotation axis of the rotor 3 and flows in a vortex shape, so that the blade plates 31. , The rotor 3 rotates,
After passing through the rotor 3, the flow is straightened by the straightening plates 23 and flows into the joint pipe B on the downstream side.

The magnetic sensor 5 counts the rotation operation of the rotor 3 by detecting the movement of the poles of the magnet 4, and forms a constriction formed at an axially intermediate portion of the body 1. It is attached to the outer peripheral part of the part 1a,
The counter 50 is connected to the counter by a lead wire 50.

[0028]

As described above, the flow rate sensor A according to the present invention has its rotor 3 formed in a shape in which the straight plate-like blades 31 project radially from the peripheral surface thereof, and has a cylindrical shape. The body 1 is axially aligned with that of the body 1 and supported by a storage shaft, and an annular flow path W is formed in the body 1 at an outer peripheral portion surrounding the side surface of the rotor 3. The flow of liquid such as water flowing from the upstream side of the body 1 is guided to the side surface of the rotor 3 by the annular flow path W, and from there, the rotor 3
The blades 31 of the rotor 3 are arranged along a direction perpendicular to the axial direction of the rotor 3.
, And the flow of the liquid such as water is rotated by the straight plate-shaped fixed guide vanes 24 which are disposed in a toroidal shape in the annular flow path W in a rear view. Child 3
The blades 31 are guided in such a manner as to collide with the plate surface of the blade 31 in a swirl shape in a rear view.
The guide blades 24 provided on the rotor 3 and the blade plates 31 provided on the peripheral surface of the rotor 3 are both formed in a straight plate shape.
The rotor 3 can be rotated according to the flow rate of water or the like flowing through the rotor 3, so that the flow rate sensor can be formed at low cost.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of a flow rate sensor embodying the present invention.

FIG. 2 is a front view of the flow sensor according to the first embodiment;

FIG. 3 is a vertical sectional side view of a case assembled inside the body of the flow sensor of the above.

FIG. 4 is a side view of the same case of the flow sensor;

FIG. 5 is a rear view of the flow rate sensor according to the first embodiment;

FIG. 6 is a front view of the same case of the flow sensor;

FIG. 7 is a rear view of the flow rate sensor.

FIG. 8 is a longitudinal sectional view of a main part of the flow sensor.

FIG. 9 is a front view of a rotor to be assembled in the body of the flow sensor.

FIG. 10 is a vertical sectional side view of the rotor of the flow rate sensor.

FIG. 11 is a plan view of the rotator of the flow rate sensor.

FIG. 12 is a front view of the rotator of the flow sensor.

FIG. 13 is a front view of a magnet assembled to the rotor of the flow rate sensor.

FIG. 14 is a vertical sectional side view of the magnet of the flow rate sensor.

FIG. 15 is a cross-sectional plan view of the magnet of the flow sensor;

FIG. 16 is a rear view of the magnet of the flow rate sensor;

FIG. 17 is an explanatory diagram of an operation of the flow rate sensor.

[Explanation of symbols]

A: flow rate sensor, B: joint pipe, W / Y: flow path, Z: virtual line, a: water inlet, 1 ... body, 1a ... constriction, 1b
1c: open port, 10: reduced diameter portion, 2: case, 20: cylindrical portion, 21: engagement projection, 22: bearing support member, 23: straightening plate, 24: guide blade, 25: engagement projection, 3 ... Rotor, 3
a: rotating body, 30: boss, 31: blade plate, 32: rotating shaft, 33: engaging projection, 34: drop prevention claw, 4: magnet, 40: shaft hole, 41, 42: engaging recess, 5 ... magnetic sensor, 50 ... lead wire, 60 ... O-ring, 61 ... flange, 7
... dam plate, 70 ... bearing support member.

Claims (3)

(57) [Claims] 1. A reduced diameter portion 10 is formed in the middle of a body 1 formed in the shape of a shaft cylinder, and an inner diameter of the reduced diameter portion 10 is formed at a central portion on an upstream side which is a rear end side of the reduced diameter portion 10. An annular ring in which an upstream channel Y in the body 1 is radially expanded between the dam plate 7 and the upstream end face of the reduced diameter portion 10 with a dam plate 7 having a substantially corresponding diameter. Is formed inside the annular flow path W, and a straight plate-shaped blade plate 3 radially protruding from the peripheral surface is formed inside the annular flow path W.
Are supported axially along the axial direction of the body 1, and the annular flow path W around the rotor 3 is provided.
A plurality of guide blades 24 formed in the shape of a straight plate are arranged in a tomical shape in a rear view and fixedly mounted on the body 1, and the front of the guide blades 24 in the rotation direction of the rotor 3 is mounted. A flow sensor characterized in that water inlets a for connecting an annular flow path W to the peripheral surface of the rotor 3 are formed between the lower guide vane 24 and the rear guide vane 24. 2. A reduced diameter portion 10 is formed at an intermediate portion in the axial direction of a body 1 formed in a cylindrical shape, and a case 2 formed in a cylindrical shape is mounted on an inner peripheral side of the reduced diameter portion 10 on an upstream side of the body 1. The latter half of which is provided so as to protrude rearward of the reduced diameter portion 10, and is provided with a straight plate-like blade plate 31. Child 3
Is mounted on the storage shaft so that the axial direction is along the axial direction of the body 1, and the reduced diameter portion 10 is provided at the rear end of the case 2.
A dam plate 7 having a diameter substantially corresponding to the inside diameter of the
An annular flow path W surrounding the outer peripheral side of the rotor 3 is formed between the front end of the flow path Y on the upstream side in the body 1 and the rear surface of the reduced diameter portion 10; In the annular flow path W, a plurality of guide vanes 24 formed in the shape of a straight plate are arranged in the shape of a tom in a rear view and fixedly mounted on the body 1. Water inlets a are formed between the front guide vane 24 and the rear guide vane 24 in the rotation direction of the rotor 3 to make the annular flow path W communicate with the peripheral surface of the rotor 3. A flow sensor. 3. The flow sensor according to claim 2, wherein the guide vanes are connected to the rear half of the case and mounted.