JP2575627Y2 - Liquid level detector - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid level detecting apparatus mounted on a vehicle and used for detecting the level of cooling water or the like.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional apparatus of this type. In the figure, the float 1 is displaced in accordance with the change of the liquid level. A magnet 2 is built in the float 1 and its magnetic force
Reed switch 4 housed in switch case 3
Operates. As a result, the circuit between the external lead wires 5a and 5b is opened or short-circuited. That is, the change in the liquid level is converted into the opening and closing of the electric circuit, and an alarm device (not shown) is operated.

Reference numeral 6 denotes a switch holder for holding the reed switch 4 via external lead wires 5a and 5b connected to the lead terminals thereof. Positioning is performed. 7 is a conducting wire for connecting one lead terminal of the reed switch 4 to a lead wire, and 8 is a switch holder 6
Is filled between the switch holder 6 and the case 3 to fix the resin in a predetermined position in the case 3, 9 is packing for preventing the filled resin from reaching the reed switch 4, and 10 is a float 1 is a stopper that regulates the amount of downward movement.

[0004]

The mounting level of this type of liquid level detecting device has been diversified in recent years, and a structure capable of withstanding even under considerable vibration is required. The above-described liquid level detecting device employs a cantilever support structure in which one end of a reed switch 4 is supported by a packing 8 attached to a portion between lead terminals or conductive wires and external lead wires 5a and 5b. Susceptible to vibration. In other words, the vibration may cause the reed switch 4 to collide with the inner wall of the switch case 3, causing a shift in the impressed value, the open value, and the like, and the glass tube of the reed switch 4 to be broken, thereby causing a switch inoperative state.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a liquid level detecting device which protects a reed switch from external vibrations and performs a stable detecting function in view of the above-mentioned conventional problems.

[0006]

In order to achieve the above object, a liquid level detecting device according to the present invention is provided with a magnet which moves together with a float which moves up and down in accordance with the level of the liquid level through a switch holder inside a case. Glass mounted
In a liquid level detecting device for detecting a liquid level by opening and closing a reed switch which is a tube unit, the switch holder is integrally formed at one end and an insertion hole is provided at a central portion.
Insulating material with column-shaped protrusions to house and hold external lead wires
Holder body consisting of
And one end is attached to the projection and the cushion
A tube of insulating material acting as
U-shaped cross section fitted by crimping over the tube
Of the reed switch housed in the tube
U-shaped holding section to accommodate, formed upright at the tip
First terminal locking portion, second end bent at rear end
Formed integrally with conductive material so as to have a child locking part
And a holding member, which is inserted through the insertion hole of the projection.
The reed switch at one end of the reed switch
The lead switch is electrically connected to and supported by external lead wires.
The lead terminal at the other end of the switch is electrically connected to the first terminal locking portion.
Connected to and supported by the second terminal locking portion.
It is characterized in that external lead wires are electrically connected .

[0007]

According to the above construction, the holder body made of an insulating material is
It holds and holds the external lead wire, and one end has a columnar protrusion.
The tube is made of an insulating material
At one end and crimp it over the tube.
The retaining portion of the U-shaped cross section of the holding member is fitted.
The tube and holding member are integrated with the holder body.
Have been. The lead terminal at one end of the reed switch
Through the insertion hole at the center of the
Is connected and supported, and the lead terminal at the other end is
Since it is electrically connected to and supported by the terminal locking portion 1,
For reed switches, the lead terminals
It is stably held by the holding structure. Note that the other
The external lead wire is connected to the second terminal locking portion of the holding member,
Part, the other of the reed switch via the first terminal locking part
It is electrically connected to the lead terminals. In addition, glass tube uni
Reed switch acts as a cushion
A U-shaped cross section of the holding member housed inside the tube
Jo of Runode is housed in the holding portion, the total of the reed switch
The body becomes covered with the tube,
Even if the reed switch collides with the switch case, the tube
The shock is relieved. The tube is
If the refill switch is filled with
It is also a protective material.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a liquid level detecting device, FIG. 2 is an exploded perspective view of a reed switch holding portion, and FIG. 3 is a cross-sectional view of a reed switch holding portion.

As shown in FIG. 1, the liquid level detecting device comprises a float 1, a magnet 2 (not shown), a switch case 3, and a switch holder 6 as in the prior art, and a glass tube unit held by the switch holder 6. The reed switch 4 is accommodated and fixed in the switch case 3.

The switch holder 6 is, as shown in FIG.
A holder body 6a for housing and holding the external lead wires 5a and 5b and formed of a synthetic resin as an insulating material; a holding member 6b having a substantially U-shaped cross section and press-forming a conductive metal piece; Made as a cushion made of synthetic resin
And a tube 6c to be used.

The switch holder 6 has a columnar projection 6d integrally formed at one end, and an insertion hole 6e for inserting and supporting a lead terminal at one end of the reed switch 4 is provided at the center of the projection 6d. Have been.

The holding member 6b is formed with a switch holding portion 6f having a low wall U-shaped cross section, a high locking portion 6g having a U-shaped cross section and fitted into the engagement portion 6d, and an upright end. No.
A terminal locking portion 6h as a first terminal locking portion and a terminal locking portion 6i as a second terminal locking portion bent at the rear end.
Are integrally provided.

[0013] As can be seen from FIG. 3, the reed switch 4 is a glass tube unit is coated on the entire surface tube 6c, is housed in a U-shaped cross section of the switch holding portion 6f, the lead terminals 4a said terminal retaining end supported connected to stopper portion 6h, the lead terminals 4b of the other end is connected to the external lead wire 5a through the insertion hole 6e of the projection 6d. As a result, the reed switch 4 is supported at both ends by the terminal locking portion 6h and the protrusion 6d.

One end of the tube 6c is attached to the protrusion 6d, and from above the tube 6c, the U
The character-shaped locking portion 6g is fitted on the protrusion 6d.

The other external lead wire 5b is connected to the terminal locking portion 6i of the holding member 6b.

First, the reed switch 4 is housed in the tube 6c, and the end of the tube 6c is inserted into the projection 6d while the lead terminal 4b at one end of the reed switch 4 is passed through the insertion hole 6e. To adhere. Next, the U-shaped locking portion 6g of the holding member 6b is fitted to the protrusion 6d from above the tube 6c by caulking, and the lead terminal 4a at the other end of the reed switch 4 is locked to the terminal locking portion 6h. Then, the reed switch 4 is accommodated in the holding member 6b in a double-supported state. Then, the lead terminal 4b of the reed switch 4 is connected to the external lead wire 5
subjected solder a, the other outside terminal locking portion 6i of the holding member 6b
The yellowtail lead wires 5b solder to fix.

The unitized switch holder 6 is inserted and fixed to the switch case 3 from the reed switch 4 side.

[0018]

According to the present invention as it has been described above devised], Li
The lead switch at one end of the
Is inserted through the insertion hole of the protrusion and connected to one external lead wire.
And the other lead terminal is the first terminal of the holding member.
A first terminal locking portion that is electrically connected to and supported by the locking portion;
A second terminal part whose part is electrically connected to the other external lead wire
Hold the reed switch through the stop and the tube.
Reed switch lead
Terminals are supported at both ends and connected to external lead wires
From, the reed switch is held without moving to the holder body
It is resistant to vibration and has a low risk of malfunction and damage.
The reed switch, which is a glass tube unit, is
Housed in a tube that acts as a
The case where the reed switch passes through the tube during vibration
If the tube collides with the
The protection of the mode switch is further enhanced.

Therefore, it is possible to obtain a liquid level detecting device capable of reliably outputting a signal under a severe environment.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a liquid level detecting device according to the present invention.

FIG. 2 is an exploded perspective view of a reed switch holding portion in FIG.

FIG. 3 is a sectional view of a reed switch holding portion in FIG.

FIG. 4 is a sectional view showing an example of a conventional liquid level detecting device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Float 2 Magnet 3 Switch case 4 Reed switch 4a, 4b Lead terminal 5a, 5b External lead wire 6 Switch holder 6a Holder body 6b Holding member 6c Tube 6d Projection 6e Insertion hole 6f Switch holding portion 6g Locking portion 6h First Terminal locking part 6i Second terminal locking part

Claims (1)

(57) [Scope of request for utility model registration] 1. A reed switch, which is a glass tube unit mounted inside a case via a switch holder , is opened and closed by a magnet that moves together with a float that moves up and down according to the level of the liquid level to detect the liquid level. In the liquid level detecting device, the switch holder is formed in one end integrally, and is formed in a column shape having an insertion hole provided in a center portion.
With a protrusion of
A holder body, and the reed switch is housed therein and one end is front.
From the insulating material attached to the projection and acting as a cushion
And the protrusion is fitted to the protrusion by caulking from above the tube.
Locking portion having a U-shaped cross section, and a lead housed in the tube.
Holding section with a U-shaped cross section
First terminal locking portion formed upright, bent at rear end
Member made of a conductive material having a terminal locking portion according to the second measure.
And the reed switch inserted into the insertion hole of the projection
Electrical connection of the lead terminal at one end to one external lead wire
And a lead terminal at the other end of the reed switch.
Is electrically connected to and supported by the first terminal locking portion, and
The other external lead wire is electrically connected to the second terminal locking portion.
Liquid level detecting apparatus characterized by and comprising.