JPH0122094Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a flow rate detector that generates a pulse signal with a frequency proportional to the flow rate of a fluid to be measured.

A turbine-shaped rotor is provided in the center hole of the pipe-shaped main body so as to be rotatable about the same axis as the shaft center, and the rotor rotates in proportion to the flow rate of the fluid to be measured flowing through the center hole. A flow rate detector has already been proposed that detects the flow rate of the fluid to be measured by utilizing changes in the magnetic relationship between a permanent magnet attached to the body and a Hall IC provided on the main body side.

The Hall IC of the flow rate detector described above is held at a predetermined position in a case attached to the main body, and the lead wire is connected to a terminal provided in the case by soldering.

However, it is not easy to mold and solder the lead wires within a narrow case, and there is a problem in that work efficiency is poor.

This invention was made in order to solve the above-mentioned problems, and the purpose is to obtain a flow rate detector that allows easy attachment of a magnetic detector and connection of lead wires.

An embodiment of this invention will be described below with reference to FIGS. 1 to 4.

In FIG. 1, reference numeral 1 indicates that an inlet passage 2 and an outlet passage 3 are arranged so that their axes are perpendicular to each other;
Showing the formed body, an inlet passage 2 and an outlet passage 3
A rotor 4 is provided at the intersection of the two.
The rotor 4 has a spiral or turbine shape, and is disposed so that its axis coincides with the axis of the outlet passage 3, with a support shaft 5 protruding from both ends.
6 is pivotally supported by the main body 1 via bearings 7 and 8.

One of the bearings 7 has a blind hole into which the tip of the support shaft 5 enters so that the fluid to be measured (for example, water) that flows in from the inlet passage 2 and rotates the rotor 4 can flow out through the outlet passage 3. a central portion 7a having;
It is composed of a plurality of legs 7b extending radially from a central portion 7a, and the tips of the legs 7b are fixed in a predetermined position by fitting into a recess in the main body 1.
The other bearing 8 is a disc-shaped member having a through hole in the center through which the support shaft 6 passes, and is fixed in a predetermined position by fitting into a recess in the main body 1 at the peripheral edge. There is.

Further, at the tip of the support shaft 6, a ring-shaped permanent magnet 10 is housed in a plastic magnet case 9.
is installed.

The inlet passage 2 is provided at a position such that an extension of its axis intersects the axis of the rotor 4 at approximately the center in its length direction.

As shown in FIG. 2, a port 2a for directing the fluid to be measured flowing in from the inlet passage 2 toward a limited portion of the rotor 4 is located in the rotor 4 when viewed from the axial direction of the inlet passage 2. It is formed in a position where only about half of its surroundings can be seen.

Therefore, the fluid to be measured that has passed through the port 2a rotates the rotor 4 in one direction.

On the other hand, the plate 12 is attached to the main body 1 by bolts 13 so as to form a closed chamber 11 accommodating the permanent magnet 10 and the magnet case 9 between the plate 12 and the bearing 8.
fixed to the magnetic detector (e.g. Hall IC)
14. A case 16 for supporting the thermistor 15 in a predetermined position is fixed to the plate 12.

The case 16 of this embodiment includes a magnetic detector 14,
It consists of a holder 18 that supports the thermistor 15 and five terminals 17 whose surfaces facing the lead wires are flat, and a cover 19 that accommodates the holder 18, and the space inside the cover 19 is filled with a filler 20 such as epoxy resin. has been done.

Note that 19-1 is an injection hole for injecting resin into the cover 19, 19-2 is a deaeration hole, and a through hole through which the terminal 17 is inserted is provided.

As shown in detail in FIG. 3, the holder 18 has a flat portion 18-1 that supports the five terminals 17, and an upright portion 18-2 that stands up from the flat portion 18-1. Magnetic detector 14 on the top of 2
A recess 18-3 is formed for inserting from above.

A magnetic detector 1 is mounted on the flat portion 18-1.
two protrusions 18-4 located between the lead wires having rigidity of 4 and for regulating the position of the lead wires;
, the lead wire of the magnetic detector 14 and the thermistor 15
Two pairs of protrusions 18-5 are provided, which are located between the lead wire and the lead wire of the thermistor 15 to regulate the position of the lead wire.

The protrusion 18-4 has a conical shape with a tapered tip, and the conical surface aligns the magnetic detector 14 with the recess 18-3.
As shown in FIG. 4, the three lead wires bent into a predetermined rough shape come into contact with the three lead wires that move when inserted into the body, and are brought into a predetermined position, that is, the tips of each lead wire are moved as shown in FIG. Guide it so that it makes proper contact with the end (plane) of each terminal 17.

In the state shown in FIG. 4, the work of connecting the lead wire of the magnetic detector 14 to the terminal 17 can be easily done without being obstructed by other parts, and the soldering can be performed reliably.

The lead wire of the thermistor 15 is also connected to the terminal 17 in the same way.

After the holder assembly thus obtained is assembled with the cover 19, the filler 20 is injected through the injection hole 19-1 of the cover 19, so that these parts can be integrated.

Note that the holder assembly can be easily assembled by forming a small protrusion on the inner surface of the through hole provided in the cover 19 for inserting the terminal 17, or by slightly shifting the axial distance between the through holes from the spacing between the terminals 17. When combined with the cover 19, separation of the two can be prevented.

As described above, according to this invention, the holder that supports the magnetic detector and the terminal and the cover that houses the holder are separate, and the cover is provided with a through hole through which the terminal is inserted. Mounting the lead wire to the holder and soldering the lead wire to the terminal can be done easily and efficiently.

In addition, the magnetic detector and holder can be reliably positioned with respect to the cover through the through holes in the cover, and the positioning of the magnetic detector and holder with respect to the cover can be eliminated even when filling material is injected, so the characteristics are improved. This has the effect of providing stability and high reliability.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of a flow rate detector according to an embodiment of this invention, Fig. 2 is a side view of the main body, Fig. 3 is a perspective view of the holder, and Fig. 4 is a magnetic detector and thermistor attached to the holder. FIG. In the figure, 1 is the main body, 2 is an inlet passage, 3 is an outlet passage, 4 is a rotor, 10 is a permanent magnet, 12 is a plate, 14 is a magnetic detector, 15 is a thermistor,
16 is a case, 17 is a terminal, 18 is a holder, 18
-1 is the flat part, 18-2 is the upright part, 18-3
18-4, 18-5 are projections, 19 is a cover, and 20 is a filling material.

Claims (1)

[Scope of utility model registration request] a main body having an inlet passage and an outlet passage arranged so that their axes are substantially perpendicular to each other; a rotor supported rotatably about an axis parallel to the axis of the outlet passage; and a permanent body that rotates together with the rotor. a magnet; a plate attached to the main body so as to close one end of the exit passage; and a plate disposed opposite to the permanent magnet with the plate in between, which emits pulses with a frequency proportional to the rotational speed of the permanent magnet. A holder for supporting a generated magnetic detector, a terminal to which the magnetic detector and its lead wire are connected, and a through hole for holding the holder in a predetermined position on the plate and for inserting the terminal. Flow rate detector with a cover.