JPH0342595Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a flow rate switch, and more particularly, to an improvement in a flow rate switch that includes a paddle that is raised in response to the flow rate of a fluid, and a switch that responds to the movement of this paddle.

<Prior Art> A conventional example of this type of flow rate switch is shown in FIG. The body of a conventional flow rate switch is composed of a main body a with an open upper part and a lid b that closes the open part, and a paddle c is attached to the lid b via a support arm f so that it can be swung up and rotated. It can be installed freely. In the figure, d indicates a permanent magnet attached to paddle c, and e indicates a proximity switch responsive to permanent magnet d.

The reason why the body is constructed of two members, the main body a and the lid b, is to allow the paddle c to be attached simply and accurately. In other words, in order for the paddle to move smoothly, it is necessary to keep the pivot axis h of the paddle horizontal, but it is extremely difficult to accurately position it within the flow path with an inner diameter of approximately 1.5 cm. It is. Therefore, a method has been adopted in which a paddle is attached to the lid b in advance and fixed to the main body a with screws g.

<Problem that the invention attempts to solve> However, in this way, the body is divided into main body a and lid body b.
Consisting of two members will not only lead to an increase in the number of parts and an increase in assembly time, but it will also be necessary to provide a seal i between both a and b. especially,
The open part of the main body a needs to be large enough to allow the paddle c to be inserted, and in order to maintain the watertightness of this large open part, great care must be taken in processing and installing the seal i. Become.

Therefore, when improving such a conventional paddle type flow rate switch, it is necessary to simultaneously solve the following three problems.

First, it is easy to assemble and disassemble. It must be easy to assemble during manufacturing, as well as be easy to disassemble and reassemble for repair or replacement of parts such as paddles. In particular, since the paddle is rotatably disposed within a narrow flow path, it is desired that its assembly be simple.

Second, accuracy. Ease of assembly and disassembly comes at the expense of accuracy, but this type of flow switch cannot operate accurately unless the paddle is pivoted horizontally. Therefore, in addition to ease of assembly and disassembly, it is essential to be able to horizontally support the paddle in an accurate position.

The third issue is watertightness. Even if the first and second requirements can be met, if a seal is required as in the past, there will still be a problem with watertightness, and the basic This does not actually solve the problem.

<Means for Solving the Problems> Therefore, the present invention provides a flow rate switch equipped with a paddle, in which the main body is composed of a single hollow cylindrical member having a flow passage inside, and the inner surface of the flow passage on the inlet side A convex portion is formed on the convex portion, and a concave line is formed further from the convex portion on the inlet side, and a support body that rotatably supports the paddle is inserted from the inlet side and unrotatably touches the convex portion. Provided is a flow rate switch characterized in that a locking member is fitted into the groove and a support is fixed by the locking member and the convex portion, and the above problem is solved. solve.

<Functions> The present invention has the following effects.

First, the paddle can be attached by simply inserting the support and fitting the locking member, and it can be easily disassembled for repair or replacement of parts such as the paddle, as well as assembly during manufacturing. , reassembly becomes easy.

Second, a support that rotatably supports the paddle is inserted from the inlet side and brought into unrotatable contact with the protrusion, and a locking member is fitted into the groove. Since the support body is fixed by the locking member and the convex part, the paddle can be placed in the correct position.
It can be supported horizontally.

Thirdly, because the body is composed of a single hollow cylindrical member with a flow path inside, there is no open part like in the past, and there is no need for a seal, which also solves the problem of watertightness. It is possible.

<Example> An example of the present invention will be described below based on the drawings.

As shown in the cross-sectional view of FIG. 1, this flow rate switch is composed of a single hollow cylindrical member in which a main body 1 has a flow passage 2 having a circular longitudinal section. If this body main body 1 is made of metal, it can be entirely formed by cutting. In the figure, the right end of the channel 2 is the inlet, and the left end is the outlet.

A paddle 3 is arranged within the flow path 2. The paddle has a flat plate shape and has supporting shaft insertion portions 4, 4 bent on both sides of the upper end, and a permanent magnet 5 is attached to the upper center surface. This permanent magnet 5 is placed on the paddle 3 via a magnet packing 61 and a magnetic reinforcing plate 62, and is attached to the paddle 3 by inserting both ends of the attachment cover 6 into the underside of the paddle and bending it. This is what is being done. The lower end of the paddle 3 is bent slightly downward. epic paddle 3
is disposed within the flow path 2 while being rotatably supported by the support body 8 .

As shown in FIGS. 3 and 4, this support body 8 includes a basic portion 82 having an opening 81 in its lower half;
It consists of a pair of support arm portions 83, 83 extending laterally from the upper end of the base portion 82, and leg portions 84 extending laterally from the lower end of the base portion 82.
A support shaft insertion hole 85 is formed in the support arm portion 83, and the support shaft insertion portions 4, 4 of the paddle are rotatably attached by a support shaft 86.

Next, the structure for fixing this support body 8 into the flow path 2 will be explained based on FIGS. 5 to 7. Convex portions 11, 12, and 13 are formed on the inner surface of the flow path 2 on the inlet side. These convex portions 11, 12, 13 are arranged on the same circumferential surface perpendicular to the axial direction of the flow path,
The upper notch portions 14 and 15 are between the convex portion 11 on the upper side of the flow path and the convex portions 12 and 13 on the side portions, and the lower notch portion 16 is between the convex portions 12 and 13 on both sides.
It is becoming.

Concave stripes 17 are formed on the inlet side of these convex portions 11, 12, 13. This groove 1
7 are arranged parallel to the convex portions 11, 12, 13 at intervals approximately equal to the thickness of the base portion 82 of the support body 8.

Then, the support body 8 to which the paddle 3 is attached is inserted from the inlet, and the base portion 82 is inserted into the convex portions 11 and 1.
2 and 13. At this time, the upper convex part 1
1 is set equal to the width m' between the support arm parts 83, 83 of the support body 8, and the width n of the lower notch part 16 is set equal to the width n' of the leg part 84 of the support body 8. As a result, rotation of the support body 8 is completely eliminated.

Note that the upper cutout portions 14 and 15 form a space into which the support arm portions 83 and 83 of the support body 8 and the support shaft 86 can be inserted.

Next, a ring-shaped locking member 9 (preferably a spring body expanding radially outward) is inserted from the inlet and fitted into the groove 17. As a result, the base portion 82 of the support body 8 is sandwiched between the convex portions 11, 12, 13 and the locking member 9, and movement in the axial direction of the flow path is eliminated.

As a result of the above, the support body 8 is fixed in a state where its rotation and axial movement are completely restricted.

As shown in FIGS. 1 and 2, a proximity switch 21 that responds to the permanent magnet 5 of the paddle 3 is attached to the upper surface of the main body. This proximity switch consists of a switch main body 22 and mounting legs 23, 23, and is attached to the main body 1 by fastening the mounting legs 23, 23 with screws 24, 24.

Lead wires 25, 25 are drawn out from the end of the switch body 22 on the inlet side. However,
For reasons such as wiring, it is often necessary to pull out the lead wires laterally. Therefore, in this flow rate switch, a substantially U-shaped guide 26 is arranged between the mounting legs 23, 23. This guide has substantially U-shaped ends 27, 27 bent laterally and is rotatably inserted into the mounting legs 23, 23, and lead wires 25, 25 are inserted into the substantially U-shaped portions. It has been inserted. Thereby, the drawing direction of the lead wires 25, 25 can be changed substantially to the lateral direction. Moreover, this guide is rotatable and can be easily adapted to the vertical direction. Moreover,
Even if the lead wires 25, 25 are strongly pulled during wiring, the guide 26 receives the tension, and no load is placed on the bases 28, 28 of the lead wires.

In this flow rate switch, a paddle 3 swings up in accordance with the flow rate in the flow path 2, and a proximity switch 21 responds to the permanent magnet 5 of the paddle to generate a signal in accordance with the flow rate.

Note that the paddle can be changed to one shown in FIG. 8. This paddle 31 is configured to have a permanent magnet 32 attached to its lower surface, and a weight 33 is attached to the tip of the paddle. This makes it possible to install the flow rate switch upright. In addition, the weight 33 is a bolt
Preferably, it is made of a nut or the like and is detachable so that its weight can be easily changed.

<Effects of the invention> As described above, in the present invention, since the body main body is composed of a single hollow cylindrical member having a flow path inside,
There is no open part like in the past, and there is no need for a seal. Furthermore, the number of parts can be reduced compared to conventional flow rate switches, which have a body made up of two parts: the main body and the lid.
It is possible to provide a flow rate switch that eliminates the need for sealing large openings and that allows accurate paddle positioning with simple installation. Further, the support body and paddle can be easily taken out by simply removing the locking member, and the weight can be easily replaced.

Therefore, the present invention can provide an ideal paddle-type flow rate switch that can solve the above three problems at the same time.

[Brief explanation of the drawing]

Fig. 1 is an axial center vertical cross-sectional view of a flow rate switch according to an embodiment, Fig. 2 is a plan view thereof, Fig. 3 is a front view of the support, Fig. 4 is a right side view of the same, and Fig. 5 is a flow rate switch. A front view of the switch, FIG. 6 is a front view of the main body, FIG. 7 is an enlarged view of the main part of FIG. 1 is an axial center vertical cross-sectional view of a conventional flow rate switch. DESCRIPTION OF SYMBOLS 1... Body main body, 2... Channel, 3... Paddle, 4... Support shaft insertion part, 5... Permanent magnet, 6...
...Attachment cover, 21...Proximity switch, 9...Locking member, 11...Top convex portion, 12, 13...Side convex portion, 14, 15...Top notch portion, 16...
... lower notch portion, 17 ... groove, 8 ... support body,
81... Opening, 82... Base portion, 83... Support arm portion, 84... Leg portion, 85... Support shaft insertion hole, 86... Support shaft.

Claims (1)

[Claims for Utility Model Registration] A paddle is installed in the flow path of the body body,
In a flow rate switch, a switch that responds to the movement of the paddle is attached to the body, and the paddle is swung up according to the fluid flow rate in the flow path, and the switch senses the movement of the paddle. It is composed of a single hollow cylindrical member with a flow path on the inside, and a convex part is formed on the inner surface of the flow passage on the inlet side, and a groove is formed further from this convex part on the inlet side, which rotates the paddle. A freely supporting support is inserted from the inlet side and unrotatably abuts on the convex portion, and a locking member is fitted in the groove, and the locking member and the convex portion A flow rate switch characterized by a fixed support.