JPH08190844A - pressure switch - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a pressure switch that operates reliably even in a usage state where the rate of pressure increase and decrease is extremely slow. A diaphragm 3 that is displaced by pressure from a pressure inlet, an electrical contact portion, a quick disconnect mechanism that opens and closes the electrical contact portion, and a rod 5 that transmits the displacement of the diaphragm 3 to the rapid disconnect mechanism. In the pressure switch,
The lever (A) 11 for converting the linear movement of the rod 5 into a rotational displacement via the push spring 9 and the lever (B) 12 for opening and closing the electric contact via the movable contact piece 14 are provided. The (A) 11 and the lever (B) 12 are supported by the base member 10 so as to be rotatable on the side opposite to the side supporting the symmetrical torsion coil spring 13, and the vertical portion of the symmetrical torsion coil spring 13 is supported. Due to the force (restoring force), they are always urged to rotate in opposite directions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure switch, and more particularly to a pressure switch which is mounted on, for example, a domestic well pump and which operates reliably even in a use condition in which the rate of pressure increase and decrease is extremely slow. Regarding switches.

[0002]

2. Description of the Related Art Conventionally, this type of technique uses a cylindrical drive magnet (permanent magnet) to perform a quick action, as described in, for example, Japanese Patent Publication No. 51-49310. Was configured as.

[0003]

However, in the case of the conventional example in which two driving magnets having cylindrical upper and lower poles are concentrically arranged, where the centers of the two driving magnets coincide,
A deadline occurs because the acting force (repulsive force of two driving magnets) is only in the radial direction. Further, if one of the inter-electrode distances (the total length of the cylinder) is larger than the other of the inter-electrode distances, a deadline is more likely to occur. And this drawback is
This occurs when the pressure increase / decrease speed is extremely slow, and when the phenomenon is extreme, a contact failure occurs.

It is an object of the present invention to provide a pressure switch which operates reliably even in a use state in which the pressure increasing / decreasing speed is extremely slow.

[0005]

In the present invention, as a quick disconnect mechanism, a single symmetrical portion having a straight portion in the center portion, symmetrically having torsion coil spring portions on both sides thereof, and further having a straight portion outside thereof. Shaped torsion coil spring, one push spring,
The quick-break mechanism is composed of the restoring force of two movable contact pieces (leaf springs) and two levers and their base members.

One of the two levers, one end of which is engaged with the rotary shaft provided on the base member, is designed to rotate by sensing a pressure change through a pressing spring. The other one of the two levers is engaged with a movable contact piece having a movable contact at its tip with an arbitrary gap. A symmetrical torsion coil spring is rotatably supported between two levers. The vertical component force generated by the restoring force of the symmetric torsion coil spring urges the two levers to rotate in opposite directions. When no pressure is applied from the outside, the lever (A) biased by the vertical component force is rotated to the pressure inlet side, and by the base member,
Its rotation is restricted. The other lever (B) is provided with U-shaped openings on both sides, and the movable contact piece is pressed by the bottom of the opening. When the lever (B) is rotated, the movable contact provided at the tip of the movable contact piece comes into contact with the fixed contact facing the movable contact piece.
The rotation angle is limited. The vertical component becomes a pressing force between contacts (contact pressure). As for the pressing force between the contacts, the shape of the movable contact piece is determined in advance so that the contact piece is brought into contact with an arbitrary pressure even when there is no vertical component force of the symmetrical torsion coil spring.

The deadline in the above structure is generated at a position where the fulcrum points for supporting the symmetrical torsion coil springs of the two levers are aligned on the horizontal plane. At this time, the restoring force of the symmetrical torsion coil spring is generated only in the direction in which the two levers are separated from each other on the horizontal plane. A vertical force is required to rotate the two levers in a non-coincident manner on a horizontal plane, but in the present invention, the extension force of the push spring and the restoring force of the contact piece are used for this purpose. .

[0008]

When the pressure from the pressure inlet increases, the lever (A) is rotated via the push spring in the direction to reduce the opening angle of the symmetrical torsion coil spring, and the lever (B) is moved vertically. Press with force. The vertical component force gradually increases as the rotation of the lever (A) progresses. Since the vertical component force is set to be larger than the extension force of the push spring, the push spring transmits the pressure to the lever (A) in the compressed state. However, the vertical component force suddenly becomes smaller near the dead line. At the moment when the vertical component force becomes smaller than the extension force of the push spring, the push spring suddenly extends, causing the lever A to rapidly rotate. During the sudden rotation, the supporting point of the lever A supporting the central straight portion of the symmetrical torsion coil spring passes the supporting point of the lever B supporting the linear portions at both ends of the symmetrical torsion coil spring. The vertical component force of the symmetric torsion coil spring immediately reverses its direction. Therefore, the positions of the lever (A) and the lever (B) are exchanged. At this time, the lever B displaces the engaged movable contact piece to open the electric circuit. Lever (B) as described above
Since the engagement between the movable contact piece and the movable contact piece is maintained with an arbitrary gap, the displacement of the movable contact piece is not started immediately after the rotation of the lever (B) is started, and the lever (B) is not started. After reaching the stable rotation, the displacement of the movable contact piece is started only when the movable contact piece is pushed down at the upper portions of the U-shaped openings on both sides. In other words, a gap is provided between the upper portion of the opening and the movable contact piece so that the movable contact piece does not come into contact with the upper portion of the U-shaped opening until the rotation of the lever (B) reaches a stable rotation. I will leave it. If the movable contact piece is displaced and the contact is disengaged after the stable rotation of the lever (B), the dead line of the quick disconnect mechanism has already been exceeded, so that the quick disconnect operation is surely performed. The shape of the movable contact piece is determined in advance so that the contact points facing each other come into contact with each other at an arbitrary pressure, so that when the lever (B) is rotated, the bottom of the U-shaped opening is separated from the movable contact piece. However, the contact is kept stable.

When the pressure from the pressure introducing port decreases contrary to the above, the lever (A) rotates in the opposite direction to the above, and the lever (B) is rotated by the vertical component force of the symmetrical torsion coil spring. )
Press. As the pressure decreases, the rotation of the lever A progresses, the vertical component force gradually increases, and the lever (B)
Is further pressed in the same direction as the rotating direction of the lever (A). When the rotation of the lever (A) progresses close to the deadline, the vertical component force suddenly decreases, and at the moment when the vertical component force becomes smaller than the restoring force of the movable contact piece, the lever (B) rapidly rotates. To do. When the supporting point of the lever (B) that supports the linear portions at both ends of the symmetrical torsion coil spring passes the supporting point of the lever (A) that supports the central linear portion of the symmetrical torsion coil spring during sudden rotation, The vertical component of the shaped torsion coil spring reverses its direction abruptly. Therefore, the positions of the lever (A) and the lever (B) are exchanged.

As described above, according to the present invention, the occurrence of the deadline of the quick disconnect mechanism can be completely eliminated by the magnitude of the restoring force of the three types of springs.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment of the drawings.

In the figure, reference numeral 1 is a base (A) having a pressure inlet at the bottom.

A rubber ring 2 is provided on the back side of the bottom of the base (A) 1 for keeping airtightness with the pressure take-out pipe protruding from the pump body.

Reference numeral 3 is a diaphragm, and the diaphragm 3
The bead portion located on the outer peripheral portion of the base (A) 1 is supported by the flange portion of the base (A) 1 and the bottom portion of the base (B) 4 so as to maintain airtightness. The flange portion of the base (A) 1 and the outer periphery of the bottom portion of the base (B) 4 are joined by means such as ultrasonic welding. A rod 5 and a main spring 6 are arranged on the upper surface of the diaphragm 3. The rod 5 has a medium diameter portion 5b on the upper portion of the large diameter portion 5a,
A screw portion 5c is provided on the upper portion thereof, and a small diameter portion 5d is provided on the upper portion thereof. Further, an eccentric projection 5e is arranged on the top of the small diameter portion 5d. In order to change the length of the main spring 6 and set the load for pressing the diaphragm 3 via the rod 5, the adjusting nut 7 is screwed into the hollow male screw portion protruding from the bottom of the base (B) 4. Then, when the screwing dimension of the adjusting nut 7 and the hollow male screw portion increases, the load applied to the diaphragm 3 increases.

Reference numeral 8 is a sleeve, which has a cylindrical shape with a collar 8a at one end. The medium-diameter portion 5b of the rod 5 penetrates the inside of the sleeve 8 in the cylinder, and one end of the sleeve 8 contacts the step formed by the large-diameter portion 5a and the middle-diameter portion 5b of the rod 5, A reset spring 9 having the other end locked to the lower surface of the collar portion 8a is arranged. When the pressure switch is assembled and no pressure is applied, the end portion on the opposite side of the sleeve flange portion 8a, the rod large diameter portion 5a, and the medium diameter portion 5 are
An arbitrary gap is provided between the step formed by b.

Reference numeral 10 is a base (C) which serves as a mounting member for the quick disconnect mechanism and the electric switching mechanism.

Reference numeral 11 denotes a lever (A) having an opening 11a at one end, and the opening 11a and a shaft 10a provided on the base (C) 10 are rotatably engaged with each other. A square hole 11b is arranged at the other end of the lever (A) 11, and L-shaped grooves 11c are arranged on both walls of the square hole 11b.

Reference numeral 12 is a lever (B) having a substantially C shape. The hook portion 1 is provided in the opening direction of the lever (B) 12.
2a is provided, and the hook portion 12a and the shaft 10b provided on the base (C) 10 are rotatably engaged with each other. On both side surfaces of the lever (B) 12, a groove 12b having a substantially U shape is provided. The dimensions of the upper surface 12c of the groove 12b and the top of the rib 12d protruding from the groove bottom are such that the movable contact 15
1.5 times or more the plate thickness of the movable contact piece 14 having Further, a small groove 12e is provided on the opposite side of the groove upper surface 12c.

Reference numeral 13 has a central linear portion 13a at the central portion,
It is a bilaterally symmetric torsion coil spring having torsion coil spring portions 13b on both sides thereof and linear portions 13c outside thereof. An exploded perspective view of this portion is shown in FIG. The central linear portion 13a of the torsion coil spring 13 is rotatably supported at the deepest portion of the L-shaped groove 11c of the lever (A) 11, and the linear portion 13c is rotatably supported by the small groove 12e of the lever (B). Has been done. That is, the torsion coil spring 13 in the state where the central linear portion 13a and the linear portion 13c are supported as described above is in a state in which it is displaced by an arbitrary angle from the free state. Then, the horizontal component force of the restoring force is obtained by adjusting the opening 11a of the lever (A) 11 to the shaft 10 of the base (C) 11.
At the same time as it acts to press against a, the reaction force is applied to the engaging portion between the hook portion 12a of the lever (B) 12 and the shaft 10b of the base (C) 10, resulting in the lever (A) 1
1 and the lever (B) 12 receive a force that keeps them away from each other in the horizontal plane. Further, the vertical component force of the torsion coil spring 13 provides a force for moving the levers (A) 11 and (B) 12 apart from each other in the vertical direction, similarly to the horizontal component force.

Reference numeral 16 is a fixed contact piece having a fixed contact 17 at its tip. The electric circuit is opened and closed by separating and contacting the movable contact 15 and the fixed contact 17. Then, an electric switching mechanism is constituted by the levers, the contact pieces, and the contacts, and in this embodiment,
An electrical switching mechanism is composed of one pair of levers and two pairs of contact pieces and contacts symmetrically arranged. Both the movable contact piece 14 and the fixed contact piece 16 are L-shaped, and the linear portion of one of the L-shapes is press-fitted and fixed to the base (C) 10. The middle of the other straight part of the movable contact piece 14 is engaged with the lever (B) 12, is displaced by the rotation of the lever (B) 12, and is disposed at the tip of the movable contact piece 14. The contact 15 is moved.

Reference numeral 18 is an adjusting screw screwed into the threaded portion 5c of the rod 5. When the adjusting screw 18 is tightened, its bottom portion 18a comes into contact with the top portion of the small projection 11d provided on the lever (A) 11, and when the adjusting screw 18 is rotated in the direction opposite to the tightening direction, the bottom portion 18a thereof is (A) 11 moves in a direction away from the small protrusion 11d. Inside the upper part of the adjusting screw 18, a polygonal hole 18b as shown in FIG. 5 is provided.

A slide button 19 has a rectangular shape having an opening on one side. Two operation pieces 19a project from the bottom of the slide button 19, and the tips of the operation pieces 19a are bifurcated to form a wall 19b and a wall 19c. In the assembled state of the pressure switch, the both walls 19b and 19c are located on both sides of the torsion coil spring portion 13b of the torsion coil spring 13, respectively. A square hole 19d is provided in the middle of the operation piece 19a of the slide button 19. Further, on the inner wall in the longitudinal direction of the slide button 19, a round protrusion 19e having a round tip is arranged. Reference numeral 20 is a return spring of the slide button 19, one end of which is the slide button 1
9 is in contact with the inner wall 19f and the other end is in contact with the wall 24a of the case 24. Reference numeral 24b is a positioning wall provided on the case 24 for positioning the return spring 20.

The case 24 has a cylindrical shape having an opening on one side, and a concave hole 24g having a rising portion is provided on the bottom of the case 24. Three round protrusions 24c, 24d, 24 are provided on the rising portion on the outer side in the longitudinal direction of the concave hole 24g.
Place e. Further, an engaging protrusion 24f that engages with the square hole 19d of the slide button 19 is provided at the rising portion on the inner side in the longitudinal direction of the concave hole 24g. This exploded perspective view is shown in FIG.
Insert the slide button 19 operation piece 19a into the concave hole 2 of the case 24.
When inserted into 4g, the square hole 19d and the engaging projection 24f are elastically engaged. At this time, as described above, the return spring 20
Is compressed with one end in contact with the inner wall 19f and the other end in contact with the wall 24a, the restoring force of the circular projection 19e presses the central side wall of the circular projection 24c. When the slide button 19 is pressed against the restoring force of the return spring 20, the round protrusion 19e abuts the round protrusion 24e, and the operation piece 19a cannot move any further since it abuts the inner wall of the concave hole 24g. When the pressing force on the slide button 19 is removed, the slide button 1
9 is moved in the opposite direction by the restoring force of the return spring 20, and the circular protrusion 19e is pressed against the circular protrusion 24c and stopped. On the other hand, when a pressing force in the opposite direction to the above is applied to the slide button 19, the round protrusion 19e rides over the round protrusion 24c and moves between the round protrusion 24c and the round protrusion 24d. Since 19a contacts the inner wall of the concave hole 24g, it cannot move. When the round protrusion 19e rides over the round protrusion 24c, it cannot be overridden unless the longitudinal wall of the slide button 19 is displaced. In other words, a large pressing force is required until the round protrusion 19e rides over the round protrusion 24c, but the pushing force suddenly decreases from the moment when the round protrusion 24e rides over, giving a feeling of moderation to the operator. At this time, by setting the free length so that the restoring force of the return spring 20 is not already present even if the pushing force is removed, the slide button 19 does not move to the original position, and the slide button 19 does not move to the original position. In order to move it to the position, a pressing force in the opposite direction to the above is applied to the slide button 19 so that the round protrusion 19e moves to the round protrusion 24e.
It is necessary to get over c.

Reference numeral 21 is a lead wire composed of a plurality of wires. One end of the lead wire 21 is electrically coupled to the end portion of each contact piece described above, and the other end is out of the device and coupled to other parts. When handling the pressure switch, the lead wire 21 is not subjected to an external force as much as possible, but a certain proof stress is required against the external force. Equipment such as well pumps that are often installed outdoors need to prevent invasion of insects and other small organisms, as well as dust.
It is not preferable that there is a gap around 1. In this embodiment, the wire stopper (A) 22 and the wire stopper (B) 23 are provided so as to prevent the problem due to the above-mentioned factors. The line stopper (A) 22 is provided with a plurality of semicircular grooves 22a. The radius of the semicircular groove 22a is close to the radius of the lead wire 21, and the number of the semicircular groove 22a is the same as that of the lead wire 21. Semicircular groove 2
A round hole 22b and a flat portion 22c are provided on both sides of 2a. Also, in the middle of the line stopper (A) 22, the recess 2
2d is provided. The line stopper (B) 23 is provided with a plurality of semicircular grooves 23a. The radius of the semicircular groove 23 a is close to the radius of the lead wire 21, and the number thereof is the same as that of the lead wire 21. A round protrusion 23b and a flat portion 23c are provided on both sides of the semicircular groove 23a. A rib portion 23d is provided in the middle of the line stopper (B) 23. The reason why the line stopper (A) 22 and the line stopper (B) 23 are provided with curved surfaces is that the pressure switch has a cylindrical shape. This exploded perspective view is shown in FIG.

In FIG. 1, 25 is a screw, one for fixing the base (C) 10 to the base (B) 4, and the other for fixing the case 24 to the base (B) 4. use.

Next, the operation of this embodiment will be described.

The pressure transmitted from a device such as a pump to the pressure switch in the non-applied pressure state pushes up the diaphragm 3 in the direction opposite to the base (A) 1 against the extension force of the main spring 6, and the rod 5 also. Move in the same direction.

The movement of the rod 5 compresses the reset spring 9, but the rotation of the lever (A) 11 is not started at this point. This is for the following reason. One is that the vertical component force of the symmetrical torsion coil spring 13 at this point is larger than the extension force of the reset spring 9, and the other is that the rod 5
This is because the sleeve 8 is not in contact with the step portion formed by the large diameter portion 5a and the medium diameter portion 5b.

When the displacement of the diaphragm 3 progresses and the stepped portion formed by the large diameter portion 5a and the medium diameter portion 5b of the rod 5 contacts the sleeve 8, the compression of the reset spring 9 stops and the lever (A) 11 moves. The rotation is started. The state diagrams before and after that are shown in FIGS. 8 and 9. Further, in FIG. 11 corresponding to FIG. 8 and FIG. 12 corresponding to FIG. 9, the lever (A) 1
The rotation state of No. 1 is illustrated for easy understanding. Further, in FIG. 14 corresponding to FIGS. 8 and 11, and FIG. 15 corresponding to FIGS. 9 and 11, each part is symbolized and shown. In addition,
Parts having the same part number in the symbolized drawings and part numbers in other drawings indicate the same part.

In the state shown in FIG. 9, the vertical component force of the symmetrical torsion coil spring 13 and the extension force of the reset spring 9 are extremely close to each other. If the displacement of the diaphragm 3 progresses even a little from this state, the vertical component force of the torsion coil spring 13 becomes smaller than the extension force of the reset spring 9, so that the reset spring 9 momentarily extends and the lever (A) 11 suddenly moves. Rotate. During sudden rotation of the lever (A) 11, the positions of the central straight line portion 13a and the straight line portion 13c of the symmetrical torsion coil spring 13 are exchanged, so that the vertical component force of the torsion coil spring 13 reverses its direction. By reversing the direction of the vertical component force, the lever (B) 12 rotates in the opposite direction to the lever (A) 11. The rotation of the lever (B) 12 is stopped because the movable contact 15 contacts the base (C) 10. Further, in the lever (A) 11, the small projection top portion 11 d is adjusted to the bottom portion 18 of the adjusting screw 18 by the vertical component force of the symmetrical torsion coil spring 13.
It contacts a and stops rotating. At this time, the movable contact 15 is separated from the fixed contact 17, the electric circuit is opened, the drive source (motor or the like) is stopped, and pressure is not supplied, so that the lever (A) 11 is not further rotated. Figure 1
0 is shown. Further, FIG. 13 corresponding to FIG. 10 is illustrated so that the turning state of the lever (A) 11 can be easily understood. Further, in FIG. 16 corresponding to FIGS. 10 and 13, each part is symbolized and shown.

The movement of the electric switching mechanism will be described below with respect to the movement of the quick disconnect mechanism.

In the state shown in FIG. 8, the movable contact piece 14 is pushed midway by the top of the rib 12d of the lever (B) 12, and the movable contact 15 located at the tip of the movable contact piece 14 becomes the fixed contact 17. It is pressing.

When the lever (A) 11 rotates and the vertical component force increases, the pressing force on the movable contact 15 and the fixed contact 17 also increases.

However, when the lever (A) 11 further rotates and the vertical component force decreases, the pressing force also decreases, and finally the lever (A) 11 starts to rotate rapidly, and the lever (B) 12
Is rotated, and the movable contact piece 14 is moved to the rib 12 of the lever (B) 12.
The movable contact 15 is separated from the fixed contact 17 because it is separated from the apex of d and immediately after that, the reverse pressing force is applied from the upper surface 12c of the lever (B) 12 to the movable contact 15.

In the above-described structure, this embodiment has two important improvements for contact protection.

First, a large pressing force is applied to the movable contact 15 and the fixed contact 17 when the lever (A) 11 starts to rotate rapidly.

The pressing force is the symmetrical torsion coil spring 1
Since it is determined by the vertical component force of 3, the lever (A)
The opening angle with the lever (B) 12 may be increased at the start of the sudden rotation of the lever 11. That is, if the extension force of the reset spring 9 is made larger than the vertical component force of the torsion coil spring 13 at that time, a large pressing force between the movable contact 15 and the fixed contact 17 can be obtained.

The other one is that the top of the rib 12d of the lever (B) 12 is separated from the movable contact piece 14, and the lever (B) 1
Until the groove upper surface 12c of No. 2 contacts the movable contact piece 14, the minimum value of the pressing force (specifically about 0.98N)
In order to ensure the above, the movable contact piece 14 is provided with an appropriate displacement and assembled in a non-pressurized state from the outside, whereby unstable contact between the contacts is eliminated.

It has been described above that a gap of at least 1.5 times the plate thickness of the movable contact piece 14 is provided between the rib 12d of the lever (B) 12 and the groove upper surface 12c. This is the lever (A)
At the moment the sudden rotation of 11 starts, the symmetrical torsion coil spring 1
Since the vertical component force of 3 is also small, the turning force of the lever (B) 12 is also small and tends to be unstable. Displacement of the movable contact piece 14 in such a state easily causes trouble in the quick disconnect mechanism. . On the other hand, in the present embodiment, after the turning force of the lever (B) 12 reaches the stable region, the movable contact piece 14 as a load is brought into contact with the groove upper surface 12c of the lever (B) 12 in order to contact the lever. (B) A predetermined gap is provided in advance between the rib 12d of 12 and the groove upper surface 12c,
According to the experiment, this distance is 1. The thickness of the movable contact piece 14 is 1.
Good results were obtained in the case of 5 times or more.

When there is a pressure decrease and a voltage is applied to the drive source, each part rotates or displaces in the opposite direction.

The description will be given below.

13 and 16 show the state before or immediately after the pressure reduction starts. At this time, the small protrusion 11d of the lever (A) 11 is attached to the bottom portion 18 of the adjusting screw 18.
a, the reset spring 9 is fully extended, and the collar 8a of the sleeve 8 is not in contact with the lever (A) 11 (or the collar 8a of the sleeve 8 has a very small extension force). Abuts).

When the pressure from the pressure introducing port is reduced, the small protrusion 11d of the lever (A) 11 is fixed to the bottom portion 1 of the adjusting screw 18.
8a, the lever (A) 11 starts rotating in the opposite direction.

When the displacement of the diaphragm 3 progresses and the lever (A) 11 further rotates, the symmetrical torsion coil spring 1
The vertical component force of 3 and the restoring force of the movable contact piece 14 become very close. If the displacement of the diaphragm 3 progresses even a little from this state, the vertical component force of the symmetrical torsion coil spring 13 becomes smaller than the restoring force of the movable contact piece 14, so that the movable contact piece 14 is instantaneously restored and the lever (B ) Turn 12 rapidly.
During the sudden rotation of the lever (B) 12, the positions of the central straight line portion 13a and the straight line portion 13c of the symmetrical torsion coil spring 13 are exchanged, so that the vertical component force of the torsion coil spring 13 reverses its direction. By reversing the direction of the vertical component force, the lever (A) 11 rotates in the opposite direction to the lever (B) 12.
As described above, since the reset spring 9 is fully extended and the flange 8a is not in contact with the lever (A) 11, the rotation of the lever (A) 11 is prevented by the extension force of the reset spring 9. Absent. Since the vertical component of the symmetrical torsion coil spring 13 reverses its direction, the small protrusion 12d again presses the movable contact piece 14, and the movable contact 15 is instantaneously pressed by the fixed contact 17 to close the electric circuit. Figure 1
And shown in FIG.

The position where the lever (A) 11 rotates and stops due to the increase in pressure from the pressure introducing port is determined by the position of the bottom portion 18a of the adjusting screw 18. In addition, the bottom 1
The position of 8a is determined by the screwing depth of the rod 5.

In the present embodiment, the pressure applied is reduced and the pressure for closing the electric circuit again is adjusted by changing the position of the bottom portion 18a of the adjusting screw 18 as described above, which causes the lever (A) 11 to move. It is determined by adjusting the position of contact with the small protrusion 11d. In other words, the pressure for closing the electric circuit is adjusted by changing the opening angle between the lever (A) 11 and the lever (B) 12. As described above, when the electric circuit is closed, the vertical component force of the symmetrical torsion coil spring 13 needs to be smaller than the restoring force of the movable contact piece 14. When the opening angle is large, the vertical component force cannot be reduced unless the rotation angle of the lever (A) 11 is large. This indicates that the displacement of the diaphragm 3 must be large. Further, when the opening angle is small, the rotation of the lever (A) 11 is small and the vertical component force is small. This indicates that the displacement of the diaphragm 3 may be small. That is, the displacement of the diaphragm 3 can be controlled by changing the position of the bottom portion 18a of the adjusting screw 18, so that the pressure for closing the electric circuit can be set.

As described above, the small projection 11d of the lever (A) 11 presses the bottom portion 18a of the adjusting screw 18 (or is pressed by the bottom portion 18a). The pressing starts with a collision. When the collision is repeated many times, the adjusting screw 1
The screwing between the rod 8 and the rod 5 is loosened, and the pressure for closing the electric circuit is distorted. In the present embodiment, in order to prevent the above-mentioned deviation, a polygonal hole 18b is provided in the upper part of the inner diameter of the adjusting screw 18, and an eccentric projection 5e is provided on the small diameter portion 5d of the rod 5. With the pressure switch assembled, the center of the small diameter portion 5d of the rod 5 and the adjusting screw 1
It coincides with the center of the polygonal hole 18b of No. 8. Moreover, the top of the eccentric projection 5e of the rod 5 is engaged with the corner formed by the sides of the polygonal hole 18b. When the adjusting screw 18 is rotated from this state, the apex of the eccentric projection 5e of the rod 5 is disengaged from the corner portion formed by the sides of the polygonal hole 18b of the adjusting screw 18, and the polygonal shape is formed. It will be pressed against the side of the hole 18b. As a matter of course, since the distance between the center of the polygonal hole 18b and the corner formed by the sides is larger than that at the center of the side, the small diameter portion 5d of the rod 5 is The adjustment screw 18 cannot be rotated unless it is displaced by the difference. The assembled state is shown in FIG. When the adjusting screw 18 is manually rotated, the small-diameter portion 5d of the rod 5 is displaced so that the top of the eccentric projection 5e is engaged with the corner formed by the next side of the polygonal hole 18b. Although it is easy, the rod 5 is pressed by the collision pressing between the bottom portion 18a of the adjusting screw 18 and the small protrusion 11a of the lever (A) 11.
It is impossible to displace the small diameter portion 5d. That is, since the rotation of the adjusting screw 18 does not occur in the actual use state, the screwing of the adjusting screw 18 and the rod 5 does not become loose.

When the pump is installed on site, the movable contact 15 and the fixed contact 17 are forcibly disengaged to open the electric circuit, or the movable contact 15 and the fixed contact 17 are forcibly pressed to open the electric circuit. It needs to be closed.

The reason why the electric circuit is forcibly opened is mainly to prevent electric shock when working the charging section of other electric circuits or parts.

The reason for forcibly closing the electric circuit is mainly to know the capacity limit of the pump.

When the electric circuit is forcibly opened, it is necessary to maintain that state for a long time due to the nature of the work, and when it is closed, it is necessary to maintain the state within a certain time in order not to overload the motor. Need to return to.

In this embodiment, the symmetrical torsion coil spring 1
The torsion coil spring portion 13b of No. 3 is laterally pressed by either the wall 19b or the wall 19c provided on the slide button 19, and the round protrusion 19e provided on the slide button 19 and each round protrusion provided on the case 24. The combination of the protrusions 24c, 24d, and 24e made it possible to satisfy the above requirements.

First, the operation for forcibly opening the electric circuit will be described with reference to FIGS. 15 and 17.

FIG. 15 shows the movable contact 14 and the fixed contact 17 in contact with each other.

In FIG. 2, the slide button 19 is slid to "auto cut". Then, the wall 19b of the slide button 19 is symmetrical with respect to the arrow P direction shown in FIG.
The twisted coil spring portion 13b is pushed from the side. At this time, the lever (A) 11 is the base (C) 10,
Alternatively, since the rod 5 restricts the movement toward the diaphragm 3 side, the symmetrical torsion coil spring 13 rotates about the central straight portion 13a. Therefore, the lever (B) 12 is forcibly rotated in the direction of the lever (A) 11, so that the movable contact piece 14 is pushed down and the movable contact 1
5 is dissociated from the fixed contact 17. However, lever (A)
Since 11 is not rotated until the lever (B) 12 is moved over, the state is as shown in FIG. 17, and the purpose is to maintain the state when the electric circuit is opened. . Therefore, the round protrusion 1 of the slide button 19
When 9e gets over the round protrusion 24c, the return spring 20
Round protrusion 1 with minimal or no extension force
9e stands still between the round protrusions 24c and 24d. Holding the position of the round protrusion 19e means maintaining the open state of the electric circuit.

Contrary to the above, when the movable contact 15 and the fixed contact 17 are forcibly brought into contact with each other from the state where the electric circuit is open as shown in FIG. 16, the slide button 19 is “automatically turned on” in FIG. Slide to. Then, the wall 19c of the slide button 19 pushes the torsion coil spring portion 13b of the symmetrical torsion coil spring 13 from the side opposite to the above in the direction of arrow R shown in FIG. At this time, lever (A) 1
Since the movement of 1 toward the diaphragm 3 side is restricted by the rod 5, the symmetrical torsion coil spring 13 rotates about the central straight line portion 13a. Therefore, the lever (B) 12 is forcibly rotated in the direction of the lever (A) 11, so that the movable contact piece 14 is pushed up and the movable contact 15 is pressed against the fixed contact 17. However, lever (A) 11
Since it does not rotate until the lever (B) 12 is moved over, the state is as shown in FIG. 18, and there is nothing that hinders the movement of the round protrusion 19e except for pressing the slide button 19. The extension force of the return spring 20 returns the state of FIG. 16 again.

In this embodiment, the invasion of insects and dust from the vicinity of the external leader line where a gap is apt to occur is prevented, and the internal structure is not adversely affected even if external force is applied to the leader line. did.

The structure will be described below.

The lead wire 21 is fitted into the semicircular groove 22a of the wire stopper (A) 22. In this embodiment, the four lead wires 21 are fitted into the four semicircular grooves 22a. After that, the round protrusions 23b of the wire stopper (B) 23 are inserted into the round holes 22b of the wire stopper (A) 22, but they are pressed into the last portion of the insertion. At this time, the lead wire 21 is dressed in the semicircular groove 22a of the wire stopper (A) 22 and the semicircular groove 23a of the wire stopper (B) 23. However, the rib 23 of the line stopper (B) 23
Due to d, the flat portions 22c and 23c of the two parts do not come into close contact with each other. From this state, the wire stopper (A) 22 is fixed, and the wire stopper (A) 22 is pressed while applying ultrasonic waves to the wire stopper (B) 23. As a result, the round protrusions 23b and the round holes 22b are melted and are inserted until the flat portions 22c and 23c come into close contact with each other. Note that this is an ultrasonic welding operation that is generally performed. The flat portion 22c
And 23c are pressed until they come into close contact, the lead wire 21
The rib 23d of the wire stopper (B) 23 finally pushes and bends it into the recess 22d of the wire stopper (A) 22.

FIG. 1 is a vertical cross-sectional view showing a state in which the wire stopper (A) 22 and the wire stopper (B) 23 are assembled and attached to the pressure switch body.

The wire stopper (A) 22 and the wire stopper (B) 23 are attached to the pressure switch main body by the protrusion 1a provided on the base (A) 1 and the attachment provided below the back surface of the wire stopper (A) 22. This is done by engaging the holes 22e. 23e
Is a projection for fixing the case provided on the back of the wire stopper (B) 23, and by engaging with a hole 24f provided in the lower portion of the case 24, the case 24 is prevented from coming off. When the fixing force between the wire stopper (A) 22 and the wire stopper (B) 23 is insufficient, the flat portion 22c of the wire stopper (A) 22 and the flat portion 23c of the wire stopper (B) 23 are also excessive. The fixing force can be enhanced by sonic welding. As described above, the semicircular groove 22a of the wire stopper (A) 22 and the wire stopper (B)
The radius of the semi-circular groove 23a of 23 is approximately matched with the radius of the lead wire 21, so that when the two semi-circular grooves face each other, there is no gap on the outer circumference of the lead wire 21. Further, the lead wire 21 is the rib 2 of the wire stopper (B) 23.
Since it is pushed and bent by 3d, even if a tension or a pushing force is applied from the outside, the external force does not affect the inside.

[0062]

According to the present invention, the mechanical deadline generated in the quick disconnect mechanism of the pressure switch can be eliminated by replacing it with a physical force relationship. Further, when the pressure from the pressure introducing port is lowered, the pressure for closing the electric switching mechanism can be adjusted. Moreover, it is possible to prevent the adjustment point from changing due to a shock or the like when the pressure switch is operated. Furthermore, it is possible to provide a mechanism for forcibly opening the closed electric switching mechanism from the outside of the pressure switch and holding the state thereof, and conversely forcibly closing the opened electric switching mechanism.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

3 is a transverse sectional view of FIG. 1.

FIG. 4 is a perspective view of a first main part of the present invention.

FIG. 5 is a perspective view of a second main part of the present invention.

FIG. 6 is a perspective view of a third main part of the present invention.

FIG. 7 is a perspective view of a fourth main part of the present invention.

FIG. 8 is an operation explanatory diagram of the present invention.

FIG. 9 is also an explanatory diagram of the operation of the present invention.

FIG. 10 is likewise an operation explanatory diagram of the present invention.

FIG. 11 is a supplementary explanatory diagram of FIG.

FIG. 12 is a supplementary explanatory diagram of FIG. 9.

13 is a supplementary explanatory diagram of FIG.

FIG. 14 is an operation explanatory diagram in which the parts corresponding to FIG. 8 are symbolized.

FIG. 15 is an operation explanatory diagram in which the parts corresponding to FIG. 9 are symbolized.

16 is an operation explanatory diagram in which the parts corresponding to FIG. 10 are symbolized.

FIG. 17 is an operation explanatory diagram from the state of FIG. 15;

FIG. 18 is an operation explanatory diagram from the state of FIG. 16;

[Explanation of symbols]

3 ... diaphragm, 5 ... rod, 10 ... base (C),
11 ... Lever (A), 12 ... Lever (B), 13 ... Symmetrical torsion coil spring, 14 ... Movable contact piece, 15 ... Movable contact, 16 ... Fixed contact piece, 17 ... Fixed contact.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norio Masuko 1-1-1, Higashitaga-cho, Hitachi-shi, Ibaraki Living Company Division, Hitachi Ltd.

Claims (9)

[Claims] 1. A pressure having a diaphragm displaced by pressure from a pressure inlet, an electric contact portion, a quick disconnect mechanism for opening and closing the electric contact portion, and a rod for transmitting displacement of the diaphragm to the quick disconnect mechanism. In the switch, a lever (A) for converting the linear movement of the rod into a rotational displacement through a push spring, and a lever (B) for opening and closing an electric contact through a movable contact piece.
And a symmetric torsion coil spring having a straight portion in the central portion, a torsion coil spring portion on both sides thereof, and a straight portion outside thereof, and a central linear portion of the symmetric torsion coil spring. , The lever (A) is rotatably supported only in the moving direction of the rod, and both outer linear parts of the symmetrical torsion coil spring are supported by the lever (B) rotatably only in the moving direction of the rod, and The lever (A) and the lever (B) are supported by the base member so as to be rotatable on the side opposite to the side supporting the symmetrical torsion coil spring, and the vertical component force (restoring force) of the symmetrical torsion coil spring is restored. ), The pressure switch is configured so as to be always urged to rotate in mutually opposite directions. 2. At the initial stage of the pressure increase from the pressure inlet, the movement of the rod is converted into the displacement of the push spring, and after the arbitrary pressure is reached, the movement amount of the rod is directly rotated by the lever A. When the pressure is converted into a displacement and the applied pressure reaches an arbitrary pressure, the extension force of the push spring increases in the direction opposite to the direction of the vertical component force of the symmetrical torsion coil spring applied to the lever (A). A pressure switch characterized by being configured as described above. 3. The direction of action of the vertical component force of the symmetrical torsion coil spring applied to the lever (B) when the arbitrary pressure is reached when the pressure applied from the pressure introduction port is decreased, according to claim 1 or 2. A pressure switch characterized in that the restoring force of the movable contact piece is increased in the direction via the lever (B). 4. The method according to claim 1, wherein
After the pressure from the pressure inlet reaches an arbitrary pressure and the positions of the lever (A) and the lever (B) are reversed, the rotation of the lever (A) is regulated by an adjusting screw screwed to the rod top. The pressure switch is characterized in that the turning angle of the lever (A) is set by changing the screwing amount of the adjusting screw. 5. The polygonal hole according to claim 4, which is concentric with the threaded portion of the adjusting screw, has a small diameter portion at the upper portion of the rod threaded portion, and further has an eccentric projection portion at the top thereof. When the eccentric protrusion is engaged with the polygonal hole and the adjusting screw is rotated, when the top of the eccentric protrusion passes through the side of the polygonal hole, the adjustment screw is rotated. A pressure switch characterized by being configured to generate a rotation resistance. 6. The method according to any one of claims 1 to 5,
A U-shaped opening is formed on both sides of the lever (B), the U-shaped opening is engaged with the movable contact piece, and the movable contact piece is displaced by rotating the lever (B). A pressure switch characterized by being configured to open and close an electrical contact provided at the tip of the movable contact piece. 7. The pressure switch according to claim 6, wherein the opening width of the U-shaped opening of the lever (B) is made larger than the thickness of the movable contact piece by 1.5 times or more. 8. The movable contact piece according to claim 6 or 7, wherein the movable contact provided at the tip of the movable contact piece has an arbitrary contact pressure against the fixed contact in the assembled state where no external force acts on the movable contact piece. The pressure switch is characterized in that the shape of the movable contact piece is set. 9. The method according to claim 1, wherein
A slide button that slides in the radial direction of the torsion coil spring portion is provided in the upper part near the symmetrical torsion coil spring, and a wall protruding from the slide button to both sides of the torsion coil spring portion is provided to slide the slide button. A pressure switch characterized in that a protruding coil wall of a lever pushes a torsion coil spring portion to forcibly open a closed electric switching mechanism and close the opened electric switching mechanism.