JPH0119302Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a pressure switch, and provides a new structure that allows for easy assembly and adjustment of parts, stable and reliable operation, large current capacity, and excellent puncture resistance. It is.

That is, as an example of the conventional pressure switch is shown in FIG.
The switch 24 was opened and closed by driving a lever 28 pivoted against the adjustment spring 27.
Since the lever 28 performs an arcuate motion about the shaft 23, which is different from the axial motion of the entire pressure switch of the plunger 21, adjustment is difficult, the operation is unstable, and the durability is poor.

To explain the figure, 1 is placed on the rubber diaphragm 2 and extends from a cylindrical part 1B having a curved part 1A at the center of the bottom, to a pair of extension parts 1C, 1C having an arcuate cross section.
It is a plunger equipped with. Reference numeral 3 denotes a main adjustment screw which is loosely fitted into the center hole 4A of the upper surface of the lower base 4 and screwed onto the adjustment screw support plate 5 engaged with the recess 4B to adjust the spring presser 6; and the bottom curved portion 1A of the plunger 1.

8 has a hole 8A in the center, and has both sides 8B, 8B, a base 8C, and a free end 8D, and a free end 8D.
a movable plate provided with a pair of extended sides 8E, 8E;
is a leaf spring in which a pair of compression curved parts 9B, 9B are extended from a base part 9A, and the base parts 8C and 9A of the movable plate 8 and the leaf spring 9 are fixed to the upper base 11 together with the first terminal plate 10 by rivets. The tips 9C of the compression curved portions 9B of the leaf springs 9 are elastically engaged with the tips 8F of the extension pieces 8E of the movable plate 8 in a pivotable manner.

Reference numeral 12 denotes a sub-adjustment screw, which has a fixed contact 13 fixed to its tip and is threaded onto the second terminal plate 14 fixed to the upper base 11, and the movable contact 15 fixed to the free end 8D of the movable plate 8 is fixed. The contact 13 is connected and separated to open and close the current. Pair of extensions 1C of plunger 1
are loosely passed through the arc-shaped guide hole 4C of the lower base 4, respectively,
Its upper end 1D is brought into contact with the compression curved portion 9B of the leaf spring 9. The lower stand 4 has a free end 8D of the movable plate 8.
A hole 11A is provided in the center of the upper base 11 to allow rotation of the main adjustment screw 3 as desired.

16 is a nipple 17 equipped with a pressure receiving port 17A and a mounting screw 17B, and a bottom part 1 with a central hole 16A.
A two-stage cylindrical case welded with 6B holds the periphery of the diaphragm 2 together with the lower end of the lower stand 4,
After assembling the plunger 1, main adjustment screw 3, etc., the cut and raised tongue piece 16C of the case 16 is press-fitted into the tapered recess 4E on the periphery of the lower base 4 and fixed. Further, the upper base 11 incorporating the movable plate 8, the leaf spring 9, the sub-adjustment screw 12, etc. to which the fixed contact 13 is fixed is similarly fixed by the other tongue piece of the case 16.

Next, the main adjusting screw is moved back and forth as appropriate from the center hole 11A of the upper table 11, and the constant position of the fixed contact 13 is determined by the sub-adjusting screw 12 to set the operating pressure. For example, the main adjustment screw 3 is locked with adhesive, and the sub adjustment screw 12 is locked with solder.

Furthermore, if necessary, lead wires are connected to the first and second terminal boards, and after the center hole 11A of the upper base is sealed, the upper part of the upper base 11 is filled and completely sealed.

Next, to explain the operation, the flow normally flows from the first terminal plate 10 through the base 8C of the movable plate 8, and after branching to both sides 8B, 8B, the free end 8D, the movable contact 15, the fixed contact 13, and the sub-adjustment. Current flows through the screw 12 to the second terminal plate 14 .

When fluid pressure is applied from the pressure receiving port 16A of the nipple 16, the adjustment spring 7 is applied via the diaphragm 2.
While resisting the pressure of , the plunger 1 rises, and the tips 1D of the pair of extensions 1C push up the compression curved portions 9B of the leaf spring 9, respectively. As soon as the pressure increases further and exceeds the critical position where the extension piece 8E of the movable plate 8 becomes flush with the side edge 8B, the acting force of the compression curved portion 9C of the leaf spring 9 decreases, as shown by the broken line in FIG. The direction of is reversed, and the movable plate 8 is rapidly rotated clockwise to open both contacts 13 and 15, and the free end 8D of the movable plate 8 is connected to the critical line by the convex portion 4D of the lower table 4. It is stopped at a slightly lower position.

Next, when the pressure from nipple 17 decreases,
The diaphragm 2 and the plunger 1 are successively lowered by the action of the adjustment spring 7, and the pressing force of the leaf spring 9 on the compression curved portion 9B is reduced. At the moment when the plunger 1 descends to the predetermined position, the plunger 1 is rapidly reversed to return to its original state and both contacts 13 and 15 are closed again.

The pressure switch of this invention uses a diaphragm,
Because pressure-responsive adjustment members such as plungers, adjustment springs, and main adjustment screws are arranged on the central axis of the switch,
Not only is the positioning during assembly easy and suitable for automatic assembly, but also the adjustment and operation are stable and reliable.
Furthermore, the actuating plate and the leaf spring are each provided with a pair of extended sides and a compression curved portion, so that they act symmetrically on both extended portions of the plunger, so that the movable plate can operate in a well-balanced manner, and local wear of the contacts can be prevented. ,
In addition to the fact that the current is divided into both sides of the actuating plate, these sides are located outside the switch where ventilation and heat dissipation can easily occur, making it possible to significantly improve current capacity and durability. Further, by press-fitting the cut and raised tongue pieces of the case into the tapered recesses of the upper and lower bases and fixing them to each other, the fixing work is easy and reliable.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view of the present invention, Fig. 2 is a front view taken along arrows X _{1 -} It is a front view. 1; Plunger, 1A; Bent part, 1C; Extension part,
2; Diaphragm, 3; Main adjustment screw, 4; Lower stand, 4A; Center hole, 4C; Guide hole, 4D; Tapered recess, 6; Spring holder, 7; Adjustment spring, 8; Movable plate, 8A; Center hole , 8B; side, 8C; base;
8D; Free end, 8E; Extension side, 9; Leaf spring, 9
A; Base, 9B; Compression curved part, 10; First terminal board, 11; Upper stand, 11A; Center hole, 12; Sub-adjustment screw, 13; Fixed contact, 14; Second terminal board, 1
5; Movable contact, 16; Case, 16C; Cut and raised tongue piece, 17; Nipple.

Claims (1)

[Scope of utility model registration request] A cylindrical plunger with a pair of extensions and a curved part in the center of the bottom is placed on the diaphragm, and one end is attached to the main adjustment screw loosely fitted into the center hole on the top of the lower base that holds the periphery of the diaphragm. A movable plate in which an adjusting spring is elastically installed between the spring holder to be adjusted and the curved part of the bottom of the plunger, and a hole is provided in the center, and a pair of extension sides are provided from the free end to both sides and the base, and a free end. , and a leaf spring with a pair of compression curved parts extending from the base, and the bases of the movable plate and the leaf spring are fixed to an upper base having a hole in the center, and each movable plate is movable at the tip of the compression curved part of the leaf spring. The end of the extended side of the plate is elastically engaged so that it can pivot, and the movable contact fixed to the free end of the movable plate is brought into contact with and separated from the fixed contact that is adjustable on the upper base, and the plunger The pair of extension parts are passed through the guide holes of the lower base, and their upper ends are brought into contact with the compression curved part of the leaf spring, and the cut and bent tongue pieces of the cylindrical case are press-fitted into the tapered recesses on the periphery of the upper and lower bases. Fixed pressure switch.