JPS6015228Y2 - pressure switch - Google Patents

Description

[Detailed description of the invention] The present invention provides a pressure switch configured to sense pressure fluctuations and control the off or on operation of the switch according to the set pressure, in which an upper limit set pressure and a lower limit set pressure are set,
A specific configuration that causes the switch to operate again when the lower limit set pressure is detected, without immediately operating the switch even if the pressure drops below the upper limit set pressure after the switch operates due to the upper limit set pressure. This is what I did.

Conventional pressure switches sense when the pressure rises or falls to a certain set pressure and reverse the switch, and when it senses that the pressure drops slightly below the above-mentioned constant pressure, the switch returns to its original state. Since the switch is configured to operate at a constant pressure, if the pressure pulsates around the set pressure, the switch will not only operate frequently, but it will also be extremely inconvenient if the switch is connected to open or close a circuit such as a motor. It has the disadvantage of becoming

The present invention has a structure that eliminates such drawbacks,
A slider that senses pressure fluctuations and moves back and forth is provided with pressing parts opposed to each other on both sides of the movement direction at a predetermined interval, and each of the pressing parts operates a reversing actuating plate that alternately reverses the contact part. By making it possible to set two types of set pressure, an upper limit and a lower limit, frequent polarity reversal operations of the switch are eliminated.

An embodiment of the present invention will be described with reference to the accompanying drawings.

In the figure, reference numeral 1 denotes a cup-shaped main body, in which a mounting screw 3 is provided on the inner periphery of a cylindrical projection 2, and a passage port 5 for pressurized oil or other pressure fluid is provided in the partition wall portion 4.

In addition, a flexible diaphragm 6 is stretched in the inner cavity of the main body, and a ridge 7 on the periphery of the flexible diaphragm 6 is pressed by a press ring 8, and an insulator 10 inserted through an opening in the main body 1 is caulked with the aid of the opening. 9, and the press ring 8 is pressed down by the inner end of the insulator 10.

A recess 11 is formed in the insulator 10 , and a pair of protrusions 12 protrude from the bottom of the recess 11 to form a space between the protrusions 12 and a through hole formed between the protrusions 12 on the bottom of the recess 11 . A sliding hole 13 having a rectangular cross section is formed by the hole, and a screw hole 14 is provided in communication at the other end of the through hole.

The insulator 10 also has a movable contact support piece 15 formed as shown in FIG. The fixed contact piece 19 is fixed to the insulating insulator 10 by an insert, the fixed contact 20 is further protruded into the recess 11, the terminal leg 21 is protruded to the outside, and the fixed contact piece 19 is slightly protruded into the recess 11. The insulator 10 is fixed with an insert, and a screw hole 22 is provided through the insulator 10.

A substantially horizontal V-shaped support notch 18 is formed in the column portion 16 on the surface corresponding to the fixed contact 20.

Reference numeral 23 denotes a slider with a rectangular cross section that is slidably fitted into the slide hole 13. A head 24 with a circular cross section is provided at the inner end of the slider, and a through hole in the radial direction is provided in the middle part in the longitudinal direction. 25 is formed into a shape in which two trapezoids are arranged in parallel, and protruding pressing parts 26 and 27 opposing each other in the direction of sliding movement are provided across the through hole, and a predetermined position is provided between the pressing parts 26 and 27. form an interval of

29 is a pressure adjustment screw hinged to the screw hole 14 for pressing the pressure setting spring 28 applied to the tail end of the slider 23;

30 is a cap-shaped plate placed over the head of the slider 23 and in contact with the inner surface of the flexible diaphragm 6; the local part forming the hem contacts the inner surface of the press ring 8; one end is engaged with the insulator 10 within the waist recess 11; It is held down by a coiled spring 31.

Reference numeral 32 denotes an inverted portion 33.3 which is formed into a roughly E-shape and whose ends are fitted into the support grooves 18 of the pillar portions 16 on both sides, as shown in FIG.
3 and a center pressure-receiving piece 34 forming an inversion part 35 are protruded, and a contact part 36 corresponding to the fixed contact 20 is provided at the intersection part, and the pressure-receiving piece 34 is pressed by the slider 23. One end of a tension spring 37 passed through the space between the parts 26 and 27 and hung on its protruding end is hinged to the screw hole 22 and hung on a spring folded piece 38 protruding into the recess 11.

In the embodiment described above, the flexible diaphragm 6 enters through the passage port 5.
Pressure oil or other fluid pressure acting on the coil spring 31 and pressure setting spring 28 overcomes the elasticity of the coil spring 31 and the pressure setting spring 28 and pushes the slider 23, and as shown in FIG. In this case, the reversal operation plate 32 does not reverse, and the slider 23
continues to move downward in FIG. 1 due to the pressure distortion of the flexible diaphragm 6, and reaches the upper limit setting pressure, and the pressure setting spring 28 and the coil spring 31 are compressed as shown in FIG. 3, and the pressing part 26 receives the pressure. When the piece 34 is pressed sufficiently, the reversing portions 33,33 of the reversing actuating plate 32 are reversed from the reversing portion 35 as shown in FIG. 3 to press the contact 36 against the contact portion 20.

Accordingly, the pressure acting on the flexible diaphragm 6 gradually decreases,
Even if the slider 23 moves upward together with the cap-shaped plate 30 due to the elasticity of the pressure setting spring 28 and the pressing part 27 comes into contact with the pressure receiving piece 34, the reversing operation plate 32 does not immediately re-invert, and the upper limit set pressure is reached. When the slider 23 rises until it reaches the lower limit setting pressure, the positional change of the pressure receiving piece 34 pushed by the pressing part 27 causes the reversing part 33.
Turn it over again as shown in the figure to separate the contact portion 36 from the fixed contact 20.

The contact and separation operations between the contact portion 36 and the fixed contact 20 can be performed in the exact opposite manner to the above.

In this case, the fixed contact 20 may be placed on the upper side of FIG. 1 to correspond to the reversing actuating plate 32, or the like.

As is clear from the above steps, the present invention directly controls the opening and closing of contacts by changing the position of a flexible diaphragm that senses pressure and performs strain operation, or a slider that moves back and forth in conjunction with the diaphragm. Rather, a through hole 25 is provided in the slider 23, and pressing portions are provided on both sides of the through hole 25 to maintain a constant interval in the moving direction of the slider 23 and to oppose each other on both sides of the through hole 25. 2
6 and 27, the reversing operation plate 32 is reversed or re-inverted to control the contact and separation of the contacts, and the pressure at the time of reversal operation is the upper limit set pressure, and the pressure at the time of hip-folding reversal operation is set at the lower limit. The set pressure is the pressure width of both stages of constant pressure.
This can be easily done by adjusting the opposing spacing of 6 and 27.

Therefore, unlike conventional pressure switches, the present invention has an inventive step in that it can prevent the switch operation from flapping due to slight fluctuations in pressure.

[Brief explanation of the drawing]

The attached drawings show one embodiment of the present invention, FIG. 1 is a vertical sectional side view of the center part, FIG. 2 is a plan view taken along line A--A in FIG. 1, and FIG. 3 shows the reversing operation of the reversing operation plate 32. A longitudinal side view of a part of the
FIG. 4 is a perspective view of the fixed contact piece 17 and the reverse operation plate 32. 1->main body, 5-inlet, 6-flexible diaphragm, 10->insulator, 13-sliding hole, 15->movable contact support piece, 16->pillar section, 20->fixed contact, 23-slider, 26, 27->pressing part, 28->pressure setting spring, 32->reversing operation plate, 33->reversing leg, 34-pressure receiving piece, 36->contact part.

Claims (1)

[Scope of utility model registration request] A nearly E-shaped reversing operation plate 3 provided with a reversing operation contact portion 36
2, reversing legs 33 protruding from both sides of the contact portion 36;
and a pressure receiving part 34 protruding between the reversing legs, and each end of the reversing legs 33 is provided on the terminal leg 17.
A pair of pressing parts opposing each other with a through hole 25 forming a fixed interval on the sliding direction side of the slider 32 which reciprocates while compensating pressure fluctuations and is swingably engaged with the slider 6. 26,2
7, and in order to cause the point portion 36 of the reversal actuating plate 32 to invert toward and away from the fixed contact 20, the pressure receiving piece 34 of the plate 32 is inserted into the through hole 25 between the pressing portions 26 and 27. A pressure switch characterized in that, depending on the movement position of the slider 23, the pressure receiving part 34 is pushed by the pressing part 26 or 27 to cause the contact part 36 to be reversed.