JP3067793B2 - pressure switch - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a pressure switch that operates in response to a change in applied pressure.

[Conventional technology]

Many conventional pressure switches have a structure in which a diaphragm and a movable contact are connected by a rod-shaped member.

[Problems to be solved by the invention]

For this reason, there is a problem that the entire pressure switch becomes large.

The present invention has been made in view of such circumstances, and one of the objects of the present invention is to provide a pressure switch that can be reduced in size.

Another object of the present invention is to provide a pressure switch that can reduce manufacturing costs.

Still another object of the present invention is to provide a pressure switch which has a mechanism for self-cleaning the contacts and can extend the life of the contacts.

[Means for solving the problem]

The pressure switch according to the present invention includes: a first leaf spring; a first contact provided on the first leaf spring; a second leaf spring opposed to the first leaf spring; A second contact provided on the leaf spring and opposed to the first contact; and an elastomer opposed to the first contact on a side opposite to the second contact with respect to the first contact. The first contact spring installation part of the first leaf spring is provided at the center side of the first leaf spring, and the first contact installation part and the first contact spring installation part The outer portion of the first leaf spring, provided on the first leaf spring, is continuous through a plurality of spiral-shaped portions extending outward around the first contact installation portion, The second contact spring installation portion of the second leaf spring is provided on the center side of the second leaf spring, The contact installation portion and the outer portion of the second leaf spring are provided on the second leaf spring via a plurality of spirally-shaped portions extending outward around the second contact installation portion. It is continuous, the spiral wire portion of the first leaf spring and the spiral wire portion of the second leaf spring are opposite to each other, and the pressure difference acting on both surfaces of the film body is If the pressure is smaller than a predetermined value, the first and second contacts are separated from each other. The first contact is brought into contact with the second contact by pressing the first contact installation portion of the first leaf spring.

[Action]

If the pressure difference acting on both sides of the membrane is smaller than a predetermined value, the first and second contacts are separated, and the pressure switch of the present invention is in the open state.

On the other hand, when the pressure difference acting on both surfaces of the film body becomes a predetermined value or more, the film body is displaced to the first contact side and pushes the first contact installation portion of the first leaf spring, and the first contact is moved. Since the second contact is brought into contact, the pressure switch of the present invention is closed.

Further, since the first and second leaf springs are provided with respective spirally wound portions that are opposite to each other with the respective contact installation portions as the center, the membrane pushes the first contact installation portion of the leaf spring, When bringing the first contact into contact with the second contact,
The first and second contacts are cleaned because the first and second contacts respectively perform rotational movements opposite to each other.

〔Example〕

Hereinafter, the present invention will be described based on embodiments shown in the drawings.

The switch body 1 includes a pressure introducing pipe 1a having an external thread provided on the outer periphery thereof, and a substantially square flange 1b provided at one end of the pressure introducing pipe 1a. The pressure introduction pipe section 1a forms a pressure introduction port 1c, and a pressure P for operating the pressure switch is guided to the pressure introduction port 1c.
Reference numeral 2 denotes a substantially square plate-shaped intermediate wall member,
A circular center hole 2a is provided in the center of the intermediate wall member 2 (see FIGS. 1 and 7).

A film body 3 made of an elastomer such as rubber is sandwiched between the flange portion 1b of the main body 1 and the intermediate wall member 2.
In the free state, the film body 3 has a substantially square flat sheet shape as shown in FIGS. 5 and 6, and has a short columnar shape projecting toward the intermediate wall member 2 at the center thereof. The protrusion 3a is provided integrally, and has a diameter slightly smaller than the center hole 2a of the intermediate wall member 2.
A circular recess 1d having a diameter sufficiently larger than the center hole 2a of the intermediate wall member 2 is formed on the surface of the flange portion 1b of the main body 1 on the film body 3 side (see FIGS. 1 and 4). This recess 1d
Is connected to the pressure inlet 1c. An annular non-slip groove 1e for preventing the film body 3 from sliding with respect to the flange part 1b is provided on a surface of the flange 1b of the main body 1 on the side of the film body 3 outside the recess 1d.

On the surface of the intermediate wall member 2 on the side opposite to the film body 3, a first leaf spring 4 made of a material having good electric conductivity and rich in spring properties is laminated. As shown in FIGS. 1 and 9, the first leaf spring 4 has a substantially square plate shape in a free state, and has a central portion that projects to the side opposite to the film body 3. One contact 4a is provided integrally. The first leaf spring 4 is provided with a plurality of arc-shaped holes 4b around the first contact 4a installation portion, so that a plurality of arc-shaped holes 4b extending outwardly around the first contact 4a installation portion are formed. A spiral contact portion 4c is formed, and the first contact 4a installation portion is connected to the first leaf spring 4c via the spiral contact portion 4c.
Is continuous with the outer portion 4d.

On the surface of the first leaf spring 4 opposite to the film body 3, a substantially square plate-like spacer 5 having a circular center hole 5a having a diameter sufficiently larger than the first contact point 4a (FIG. 1) And the eighth
The second leaf spring 6 is overlapped with the first leaf spring 6 via the same (see the figure). The second leaf spring 6 is made of a material having good electrical conductivity and high spring properties, like the first leaf spring 4, and has the same shape as that of the first leaf spring 4. That is, the first
As shown in FIG. 10 and FIG. 10, when it is in a free state, it has a substantially square plate shape, and a second contact 6a facing the first contact 4a is provided integrally at the center. In the second leaf spring 6, a plurality of arc-shaped holes 6b are formed around the second contact 6a installation portion, so that a plurality of arc-shaped holes 6b extending outward around the second contact 6a installation portion are formed. A spiral contact portion 6c is formed, and the second contact 6a setting portion is connected to the second leaf spring 6c via the spiral contact portion 6c.
Is continuous with the outer portion 6d. Here, the direction of the spiral wire portion 6c of the second leaf spring 6 is opposite to the direction of the spiral wire portion 4c of the first leaf spring 4. Further, the first and second leaf springs 4, 6 have terminal portions 4e, 6e protruding outward.
Are provided respectively.

On the surface of the second leaf spring 6 on the side opposite to the film body 3, a lid member 7 having a substantially square plate shape is overlapped, and the surface of the lid member 7 on the side of the second leaf spring 6 is arranged. A circular recess 7a having the same diameter as the center hole 5a of the spacer 5 is provided at the center (see FIGS. 1 and 11). An operating pressure adjusting screw 8 is screwed to the center of the lid member 7 in a direction perpendicular to the second leaf spring 6.

As shown in FIGS. 4, 5, 7 to 10, near the four corners of the main body 1, the intermediate wall member 2, the membrane 3, the first leaf spring 4, the spacer 5, and the second leaf spring 6. Are screw insertion holes 1f, 2b, 3
b, 4f, 5b, and 6f are provided, respectively. As shown in FIG. 11, screw holes 7b are provided near the four corners of the lid member 7. A set screw 9 is inserted into the screw insertion holes 1f, 2b, 3b, 4f, 5b, 6f of the main body 1, the intermediate wall, the membrane 3, the first leaf spring 4, the spacer 5, and the second leaf spring 6. The leading ends of these set screws 9 are screwed into the screw holes 7b of the lid member 7, so that the main body 1, the intermediate wall member 2, the membrane 3, the first leaf spring 4, the spacer 5, The second leaf spring 6 and the lid member 7 are fastened in a state where they are overlapped with each other. The first leaf spring 4 has its outer portion 4d sandwiched between the intermediate wall member 2 and the spacer 5, and the second leaf spring 6 has its outer portion 6d sandwiched between the spacer 5 and the lid member 7. It is pinched.

 Next, the operation of the present embodiment will be described.

FIG. 1 shows a state in which no pressure is applied to the pressure inlet 1c. In this state, the portion of the film body 3 sandwiched between the main body 1 and the intermediate wall member 2 protrudes toward the concave portion 1d, so that the central portion of the film body 3 moves away from the first leaf spring 4. Due to the deformation in the direction, the protrusion 4 a is separated from the first leaf spring 4. Therefore, this pressure switch is open.

On the other hand, when a pressure P (positive pressure) equal to or more than a certain pressure is applied to the pressure inlet 1c, the film P is pushed toward the lid member 7 by this pressure P, and the projection 4a Of the second leaf spring 6 by pressing the vicinity of the contact 4a installation portion of the second leaf spring 6
, The pressure switch is closed.

In addition, the vicinity of the first contact 4a installation part is a spiral wire part 4c.
As described above, when the vicinity of the first contact point 4a installation portion of the first leaf spring 4 is pushed toward the second leaf spring 6 as described above, The vicinity of the contact 4a installation portion rotates clockwise as shown by the arrow in FIG. 9 when viewed from above in FIG. Further, when the second contact 6a is pressed by the first contact 4a, the vicinity of the second contact 6a installation portion of the second leaf spring 6 is also displaced toward the lid member 7, but the second contact 6a The vicinity of the installation part is the spiral wire part of the first spring plate 4
Outer part via spiral wire part 6c opposite to 4c
6d, the vicinity of the second contact point 6a installation portion is:
When viewed from above in FIG. 2, it rotates counterclockwise as indicated by the arrow in FIG. Therefore, in this pressure switch, the first and second contacts 4a and 6a are brought into contact with each other while rotating in opposite directions, so that cleaning is performed each time the contact is made, resulting in a longer life.

When the pressure P is released or becomes smaller than a certain value, the force of the projection 4a pushing the first leaf spring 4 is lost or reduced, so that the first contact 4a and the second contact 6a are separated from each other, This pressure switch is open.

In addition, as shown in FIG. 12, the operating pressure adjusting screw 8 is rotated and the tip of the screw 8 pushes the second contact spring 6a installation portion of the second leaf spring 6, and the first and second contacts 4a, 4a, If the distance between 6a is reduced, the threshold value of the pressure at which this pressure switch opens and closes can be adjusted.

In this case, the second leaf spring 6 is restricted by the adjusting screw 8 and cannot be displaced toward the lid member 7, so that the first contact 4a
When the second contact 6a comes into contact with the second contact 6a, the second contact 6a performs little rotation (in this case, the second leaf spring 6 is elastically deformed while being in contact with the adjusting member 8). Only the second contact 6a makes a rotary movement). Therefore, when the second leaf spring 6 is pushed by the adjusting screw 8 to adjust the threshold value of the switch opening / closing pressure as described above, if it is desired to rotate the second contact 6a to some extent at the time of contact, the adjusting screw 8 An elastomer such as rubber may be interposed between the distal end of the second leaf spring 6 and the installation portion of the second contact 6a of the second leaf spring 6.

FIG. 13 shows another embodiment of the present invention. In this embodiment, the film body 3 is formed in a sheet shape as a whole, and the projections 3a in the above embodiment are not provided. A short cylindrical projection 9 corresponding to the projection 3a of the above-described embodiment is provided with the first leaf spring 4.
Of the first contact 4a. Other configurations are the same as those of the above embodiment.

In this embodiment, the same operation and effect as those of the above embodiment can be obtained.

Further, in the present invention, the leaf spring provided with the first contact point has clickability (a characteristic in which a repulsive force against displacement is rapidly reduced when passing through a certain displacement point in a process of being displaced toward the second contact point). (Effect of the Invention) As described above, the pressure switch of the present invention does not couple the first contact and the membrane provided on the leaf spring with something like a rod, Since the structure is simply opposed, it is possible to obtain an excellent effect that the size can be reduced, the manufacturing cost can be reduced, the contact has a self-cleaning function, and the contact can have a long life. .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a pressure switch according to the present invention in a state where a predetermined pressure or more is not applied. FIG. 2 is a longitudinal section showing the embodiment in a state where a predetermined pressure or more is applied. 3, FIG. 3 is a plan view showing the embodiment, FIG. 4 is a plan view showing the main body in the embodiment, FIG. 5 is a plan view showing the film body in the embodiment, and FIG. FIG. 7 is a plan view showing an intermediate wall member in the embodiment, FIG. 8 is a plan view showing a spacer in the embodiment, and FIG. 9 is a view showing a first leaf spring in the embodiment. FIG. 10 is a plan view showing a second leaf spring in the embodiment, FIG. 11 is a bottom view showing a lid member in the embodiment, and FIG. 12 is an operating pressure adjusting screw for the embodiment. The distance between the first and second contacts is narrowed by Longitudinal sectional view showing the state in which a force, FIG. 13 is a longitudinal sectional view showing a main part of another embodiment of the present invention. 3 ... film body, 4 ... first leaf spring, 4a ... first contact point,
4c: spiral wound portion, 4d: outer portion, 6: second leaf spring, 6a: second contact, 6c: spiral wound portion, 6d: outer portion.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01H 35/34 H01H 1/18 H01H 1/26 H01H 1/60

Claims (1)

(57) [Claims] A first leaf spring; a first contact provided on the first leaf spring; a second leaf spring opposed to the first leaf spring; and a second leaf spring. A second contact provided on a spring and opposed to the first contact; and an elastomer opposed to the first contact on a side opposite to the second contact with respect to the first contact. The first contact spring is provided on the center side of the first leaf spring, and the first contact spring and the first contact spring are provided. The outer part of the leaf spring is provided through the plurality of spiral-shaped parts provided on the first leaf spring and extending outward with the first contact installation part as a center. The second contact mounting portion of the second leaf spring is provided on the center side of the second leaf spring, and the second contact mounting portion is provided in front of the second leaf spring. The outer portion of the second leaf spring, provided on the second leaf spring, is continuous through a plurality of spiral-shaped portions extending outward around the second contact installation portion, The spiral wound portion of the first leaf spring and the spiral wound portion of the second leaf spring are opposite in direction to each other, and a pressure difference acting on both surfaces of the film body is smaller than a predetermined value. Although the first and second contacts are separated, when the pressure difference acting on both surfaces of the film body becomes a predetermined value or more, the film body is displaced to the first contact side and the first A pressure switch, wherein the first contact is brought into contact with the second contact by pressing the first contact installation portion of the leaf spring.