JP2556474Y2 - 3-operation type pressure switch - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention, according to the change of increasing or decreasing the pressure of the fluid,
The present invention relates to a three-operation type pressure switch in which an electric switch is operated three times.

[Conventional technology]

Such a three-operation type pressure switch is mounted, for example, on the high pressure side of a refrigeration cycle of a vehicle cooling system.

FIG. 7 shows a conventional three-operation type pressure switch described in, for example, Japanese Utility Model Laid-Open Publication No. 61-93954.

40 is the lower housing. Reference numeral 60 denotes an upper housing provided with a pressure inlet 60a.

Reference numeral 70 denotes a pressure receiving displacement mechanism that is displaced when the pressure of the fluid at the pressure inlet 60a changes, and is supported from below by a holder 57 biased by a spring 58.

Reference numerals 44 and 45 denote first and second operating bodies, which are displaced by the displacement of the pressure receiving displacement mechanism 70 to turn the first and second electric switches 46 and 54 on and off.

The first electric switch 46 is turned on and off when the two movable contacts 47 and 50 come into contact with and separate from each other.

Specifically, as shown in FIGS. 7 and 8, a leaf spring 49 is attached to the upper end of a fixing portion 48 fixed near the holder 57, and is provided near the lower side of the pressure receiving displacement mechanism 70. The first movable contact 47 is fixed to the end of the leaf spring 49 horizontally.

Then, a second movable contact 50 is attached to the tip of the leaf spring 53 so as to face the first movable contact 47. The leaf spring 53 is mounted substantially horizontally on a mounting portion 52 mounted on the upper end of a fixed portion 51 erected near the holder 57.

Such a conventional three-operation type pressure switch, when the pressure in the pressure inlet 60a of the upper housing 60 is low pressure,
Due to the displacement of the diaphragm 41 of the pressure receiving displacement mechanism 70, the first support wheel 42 and the second support wheel 43 are displaced, and the second support wheel 43 applies the first movable contact 47 to the urging force of the leaf spring 49. Press down against. Thereby, the first movable contact 47 comes into contact with the second movable contact 50, and the first electric switch 46 is turned on.

When the pressure in the pressure introduction port 60a is medium pressure, the first reversing disk 61 of the pressure receiving displacement mechanism 70 reverses downward and pushes down the second operating body 45. Thereby, the movable contact 56 contacts the fixed contact 55, and the second electric switch 54 is turned on.

When the pressure in the pressure introduction port 60a is high, the displacement of the first support wheel 42 of the pressure receiving displacement mechanism 70 causes the third reversing disk 62 to reverse downward, and the first operating body 44 to be pushed down. Then, the first operating body 44 pushes down the leaf spring 53 to separate the second movable contact 50 from the first movable contact 47,
The first electric switch 46 turns off.

Thus, the first electric switch 46 is operated by the two movable contacts 47 and 50 moving up and down, respectively.

[Problems to be solved by the invention]

However, the movable contact formed by fixing the contact to the tip of a leaf spring or the like is originally not easy to manufacture, and the cost of parts and assembly is high. Must be provided, the production cost becomes very high.

The present invention solves such conventional drawbacks, eliminates the need for providing a plurality of movable contacts in one electric switch, and reduces the cost of parts and assembly. The purpose is to provide.

[Means for solving the problem]

In order to achieve the above object, a three-operation type pressure switch of the present invention receives a fluid pressure and is displaced when the pressure changes, and the pressure receiving displacement mechanism moves when the pressure is low and high. A first operating body that is displaced by the displacement of the displacement mechanism, a second operating body that is displaced following the pressure receiving displacement mechanism when the pressure is an intermediate pressure between the low pressure and the high pressure, A first electrical switch that contacts and separates a pair of electrical contacts by turning on and off the actuator, turning on and off,
A three-operation pressure switch including a second electric switch that is turned on and off by the displacement of the second operating body;
When the pressure is low and when the pressure is high, reversing means for displacing the first operating body in the opposite direction to reciprocate is provided in the pressure receiving displacement mechanism, and the pair of electrical contacts of the first electrical switch are provided. The first electric switch is turned on and off by causing one of the electric contacts to follow the reciprocating motion of the first operating body to contact and separate from the other electric contact. And

[Action]

When the pressure is low and when the pressure is high, the first working body is displaced in the opposite direction and reciprocates.

Then, one of the electrical contacts follows and reciprocates with the first operating body, contacts and separates from the other electrical contact, and the first electrical switch turns on and off.

〔Example〕

 Embodiments will be described with reference to the drawings.

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

1 is a lower housing. 2 is a pressure inlet at the top center
2a is an upper housing formed with both housings 1,
Both 2 are molded with synthetic resin. Each component constituting the three-operation pressure switch is housed in both housings 1 and 2.

On the bottom of the lower housing 1, a first electric switch 3
And a second electric switch 4 are provided.

The second electric switch 4 includes a leaf spring 5 having a movable contact 6 attached to a tip.

The base of the leaf spring 5 is fixed to a terminal 7 fixed to the base 1a.

Below the movable contact 6, a fixed contact 8 is disposed to face and fixed to a terminal 9 fixed to the base 1 a.

Therefore, the terminals 7 and 9 are electrically disconnected and disconnected by the contact and separation of the movable contact 6 and the fixed contact 8, and the second electric switch 4 is turned on and off.

The first electric switch 3 is mounted on a mounting portion 10 formed on the bottom of the lower housing 1 by molding.

The mounting portion 10 is formed in a cylindrical body, and a groove 11 that symmetrically divides the mounting portion 10 into two parts is provided at a central portion thereof. At the upper end of the mounting portion 10, step portions 10a and 10b facing the groove 11 side are formed.

A terminal 12 of the first electric switch 3 is fixed on the step 10a, and a leaf spring 13 is attached to the terminal 12.

As shown in FIG. 2, the leaf spring 13 includes a vertical base 13c and a biasing portion 13d.

A wide portion is formed at the center of the biasing portion 13d,
A convex portion 13a projecting upward and a central hole 13b are provided in the wide portion. A movable contact 14 (one electrical contact) facing upward is attached to the tip of the urging portion 13d.

The urging portion 13d is arranged substantially horizontally in the groove 11, the base portion 13c is fixed to the terminal 12 by screwing, and the leaf spring 13 is attached to the terminal 12.

A terminal 15 is fixed on one of the steps 10b, and a fixed contact 16 (the other electrical contact) is fixed below the terminal 15 so as to face the movable contact 14.

Therefore, the contact 14 comes into contact with or separates from the contact 16 only by the vertical movement of the leaf spring 13. This allows both terminals
12, 15 are electrically connected and disconnected, and the first electric switch 3 is turned on and off.

17 is a first operating body. This first operating body 17 includes:
A step 17a is formed by narrowing the head side, and this step 1
With the 7a facing upward, the first operating body 17 is a leaf spring
It is in contact with the thirteen projections 13a. Therefore, the first operating body 17 pushes the leaf spring 13 against its urging force,
By moving down, the movable contact 14 comes into contact with and separates from the fixed contact 16. The first operating body 17 has a hole 17b penetrating along the central axis.

As described above, the first electric switch 3 is configured such that the leaf spring 13 having a simple shape is mounted on the mounting portion 10 and only the leaf spring 13 is moved up and down by the first operating body 17. It has a structure that comes in contact with and separates from 16. Therefore, unlike the conventional three-acting pressure switch shown in FIGS. 7 and 8, components such as the leaf spring 53 and the fixed portion 51 for moving the movable contact 50 up and down are not required.

Reference numeral 18 denotes a second operating body that turns on and off the second electric switch 4 against the urging force of the leaf spring 5.
The lower end of the second operating body 18 is a leaf spring 5
, And slidably fitted into the hole 17b of the first operating body 17 and the central hole 13b of the leaf spring 13.

Reference numeral 30 denotes a pressure receiving displacement mechanism that receives the pressure P at the pressure inlet 2a and displaces the first and second operating bodies 17 and 18. The pressure receiving displacement mechanism 30 includes a diaphragm 24 that is displaced by the pressure of the upper housing 2, an umbrella-shaped first reversing disk 19, and a second reversing disk 2 that perform reversing operations when a pressing force is applied to a peripheral portion.
0, a third inversion disk 21, and a first support wheel 22 and a second support wheel 23 interposed between the inversion disks 19, 20, 21.

The first reversing disk 19 is in contact with the mounting portion 10 in a state where the central portion protrudes downward, and the peripheral edge 19a is in contact with the bead 10c. The first reversing disk 19 is reversed when a predetermined pressing force is applied to the peripheral edge portion 19a, and the central portion is displaced upward.

The pressing force for reversing the first reversing disk 19 is a low pressure, for example, the pressure P ₁ for reversing the first reversing disk 19 upward is 2 kg / cm ² , The pressure P ₇ is 1 kg / cm ² .

A hole 19b is formed in the center of the first reversing disk 19, and the head of the first operating body 17 is fitted into the hole 19b, so that the step 17a and the first reversing disk 19 are in contact with each other. In contact.

Above the first reversing disk 19, a second support wheel 23 that is displaced by sliding up and down in the lower housing 1 is provided.

Specifically, the lower peripheral edge of the second support wheel 23 is in contact with the peripheral edge 19a of the first reversing disk 19.

At the center of the second support wheel 23, a hole 23a into which the head of the first operating body 17 is fitted is provided.

In addition, a third reversing disk 21 having a central portion projecting upward is in contact with a peripheral portion of the upper surface of the second support wheel 23.

The third reversing disk 21 is reversed when a predetermined pressing force is applied to the peripheral portion 21b, and the central portion is displaced downward.

Pressing force to reverse the third reversing disc 21 is a high pressure, for example, the pressing force P ₃ for inverting the third reversing disc 21 downward 27 kg / cm ^2, the pressure P ₅ for re-inverted upward 21kg
/ cm ² .

In the hole 21a formed in the center of the third reversing disk 21,
The second operating body 18 is fitted.

A first support wheel 22 that slides up and down and is displaced is in contact with the upper surface of the third reversing disk 21.

On the lower surface of the first support wheel 22, the periphery of the third reversing disk 21
A projection 22a for applying a pressing force to 21b is provided. Also,
A convex portion 22b is provided on a peripheral portion of the upper surface, and a step portion 22c is formed outside the convex portion 22b.

In the center of the first support wheel 22, a hole 22d into which the second operating body 18 is fitted is formed.

A diaphragm 24 is in contact with the first support wheel 22, and a peripheral portion of the diaphragm 24 is sandwiched between the housings 1 and 2 via an O-ring 25 for sealing.

Reference numeral 26 denotes a retaining ring which abuts on the step portion 22c of the first supporting wheel 22, and prevents the components below the first supporting wheel 22 from being lifted by the retaining ring 26 at the position of the upper end surface 1b of the lower housing. Have been.

The second reversing disk 20 is disposed on the back surface of the diaphragm 24 so as to be in close contact with the upper surface of the second reversing disk 18, and the upper end of the second operating body 18 is in contact with the central portion protruding upward.

As a result, when a predetermined pressure is applied to the diaphragm 24, the second reversing disk 20 is reversed, the central portion is displaced downward, and the second reversing disk 20 pushes down the second operating body 18.

The pressing force for reversing the second reversing disk 20 is a medium pressure, and for example, the pressure P ₂ for reversing downward is
14kg / cm ^2, the pressure P ₆ for re-inverted over is 11 kg / cm ^2.

Further, the periphery of the second reversing disk 20 is
22 is in contact with the convex portion 22b.

Therefore, the first support wheel 22 is displaced by being pressed by the force applied from the diaphragm 24 to the second reversing disk 20.

In this way, the pressure receiving displacement mechanism 30 is
The reversing operation of 19 allows the first operating body 17 to be displaced upward, and the reversing operation of the third reversing disk 21 pushes down the first operating body 17 to displace it.

Accordingly, the first operating body 17 reciprocates up and down at the time of low pressure and at the time of high pressure, and moves the leaf spring 13 of the first electric switch 3 up and down.

 Next, the operation of this embodiment will be described.

3 to 5 are front sectional views showing the operation of the embodiment. FIGS. 6A and 6B show the relationship between the pressure and the on / off operation of the first electric switch and the second electric switch. FIG.

And have up for Figure 1, when the pressure P of the pressure opening 2a of the upper housing 2 is smaller than the set pressure P _1, the so-called normal pressure, the reversal disc 19, 20, 21 of the pressure receiving displacement mechanism 30 is not inverted , The first and second actuators 17 and 18 are not displaced. Therefore, as shown in FIG. 6, the first and second electric switches 3, 4 are both in the off state.

When the pressure P at the pressure inlet 2a reaches the set pressure P ₁ (low pressure), the pressure is increased via the diaphragm 24 of the pressure receiving displacement mechanism 30, the first support wheel 22, and the third reversing disk 21 to the second pressure. The second support wheel 23 is displaced by being added to the support wheel 23. Due to the displacement of the second support wheel 23, the peripheral portion 19a of the first reversing disk 19
There is pressed by the pressing force of the pressure value P _1.

Therefore, the first reversing disk 19 is reversed upward with the bead 10c as a fulcrum, and the central portion thereof is displaced upward.

As a result, as shown in FIG. 3, the first operating body 17 is displaced upward by the urging portion 13d of the leaf spring 13, and the movable contact 14 contacts the fixed contact 16.

Thus, as shown in Figure 6A, the first electrical switch 3 turns to the ON state at P ₁ value. However, since the second operating body 18 is not displaced, the second electric switch 4
Maintain the off state as shown in FIG. 6B.

Then, the first and second electrical switches 3 and 4, while the pressure P of the pressure opening 2a is in the low pressure area of P ₂ from P ₁ maintains the state described above.

When the pressure P at the pressure inlet 2a reaches the set pressure P ₂ (medium pressure), the pressure is applied to the diaphragm 24 of the pressure receiving displacement mechanism 30.
Through the second reversing disk 20 and the second reversing disk 20
There is pressed by the pressure value P _2. This allows the second inverted disc 20
Is inverted, and the center thereof is displaced downward.

Therefore, the second reversing disk 20 presses the second working body 18 downward at the center thereof, so that the second working body 18 slides down the hole 17a of the first working body 17 and descends. The leaf spring 5 is pushed down at its lower end.

As a result, as shown in FIG. 4, the movable contact 6 comes into contact with the fixed contact 8, and the second electric switch 4 is turned on.

Thus, as shown in Figure 6B and Figure 6A, the second electrical switch 4 rises to the on state at P ₂ value, the first and second electrical switches 3 and 4 is both turned on.

Then, the first and second electrical switches 3 and 4, even if the pressure P of the pressure opening 2a rises from P _2, while from P ₂ to pressure area in the P _3, this state is maintained .

When the pressure P at the pressure inlet 2a reaches the set pressure P ₃ (high pressure), the pressure is changed to the diaphragm 24 of the pressure receiving displacement mechanism 30.
And joins the first support wheel 22 via the second reversing disk 20,
The first support wheel 22 is displaced. By the displacement of the first support wheel 22, to press the convex portion 22a is a peripheral portion 21b of the third reversing disk 21 by the pressing force of the pressure value P _3.

As a result, the third reversing disk 21 is reversed, and its central portion is displaced downward.

As a result, the head of the first operating body 17 lifted by the leaf spring 13 is pushed downward by the central portion of the third reversing disk 21 and descends. Then, the lower end pushes down the urging portion 13d of the leaf spring 13 of the first electric switch 3.

As a result, as shown in FIG. 5, the movable contact 14 separates from the fixed contact 16, and the first electric switch 3 is turned off.

Thus, the first electrical switch 3, as shown in Figure 6A, changes to the off state at P ₃ values. However, since the second operating body 18 does not displace, as shown in FIG.
The ON state of the second electric switch 4 is maintained.

Then, the first and second electrical switches 3 and 4, the pressure P of the pressure opening 2a is also increased from P _3, and this state is maintained.

Note that any pressure value P ₄ from the pressure P of the pressure opening 2a is P ₃
After rising, and decreasing, the third reversing disk 21, the second reversing disk 20, and the first reversing disk 19 of the pressure receiving displacement mechanism 30 are re-inverted in this order, and the reversing disks 19, 20 , 21 returns to its original state.

At this time, the pressure at which each of the reversing disks 19, 20, and 21 re-inverts,
6A and 6B, the pressures P ₅ , P ₆ , and P ₃ are lower than the pressures P ₃ , P ₂ , and P ₁ .
The P _7.

[Effect of the invention]

According to the three-action pressure switch of the present invention, the first operating body is caused to reciprocate between when the pressure is low and when the pressure is high by the pressure receiving displacement mechanism, and one of the electric contacts of the first electric switch is set to the first. In this case, only one movable contact must be provided for each electric switch, and a bead for supporting the central part of the surface of the reversing disk is provided at the bottom of the housing. By forming the bead and the housing integrally with each other by forming it at the protruding end of the cylindrical body molded into, it is possible to reduce component costs, component management costs and assembly costs, and to make the cylindrical body diametrical. The groove to be divided is formed, and the leaf spring is arranged in the groove so as to extend from one divided part of the bead to the other divided part. Secured, it is possible to obtain an excellent switch durability.

[Brief description of the drawings]

FIG. 1 is a front sectional view of an embodiment, FIG. 2 is a perspective view of a leaf spring used in a first electric switch of the embodiment, FIG. 3 is a front sectional view showing operation at low pressure, FIG. 4 is a front sectional view showing an operation at a medium pressure, FIG. 5 is a front sectional view showing an operation at a high pressure, and FIG. 6A shows a relationship between the pressure and the operation of the first electric switch. FIG. 6B is a diagram showing the relationship between the pressure and the operation of the second electric switch. FIG. 7 is a front sectional view of a conventional three-operation type pressure switch. FIG. FIG. 4 is an exploded perspective view of a movable contact portion of the electric switch of FIG. DESCRIPTION OF SYMBOLS 1 ... Lower housing, 2 ... Upper housing, 3 ... First electric switch, 4 ... Second electric switch, 5 ... Leaf spring, 6 ... Movable contact, 8 ... Fixed contact, 13 ... Leaf spring, 14 ... Movable contact (One electrical contact), 16 ... fixed contact (the other electrical contact), 17 ... first working body, 18 ... second working body, 19 ... first inverted disk, 20 ... second inverted disk,
Reference numeral 21 denotes a third inverted disc, 22 denotes a first support wheel, 23 denotes a second support wheel, 24 denotes a diaphragm, and 30 denotes a pressure receiving displacement mechanism.

Claims (1)

(57) [Scope of request for utility model registration] 1. A first reversing disk arranged to invert outward with a weak force, and a first reversing disk arranged to inward inward with a moderate force at a position receiving fluid pressure from an outer surface. A second inversion disk, a third inversion disk arranged in a direction between the first and second inversion disks with a strong force to inward inversion with a strong force, and an outer edge of the second inversion disk A first support wheel disposed between the second and third reversing disks in a state of receiving the intermediate portion of the surface portion of the third reversing disk, and an outer edge portion of the third reversing disk and the first A second support wheel disposed between the third and first reversing disks in a state of receiving the outer edge of the one reversing disk, and when the pressure of the fluid is low and high, A first working body that is displaced by a reversing operation of a third reversing disk, and when the pressure is an intermediate pressure between the low pressure and the high pressure, A second operating body that is displaced by the reversing operation of the second reversing disk, and a pair of electrical contacts that are urged by the first leaf spring and contact and separate by the displacement of the first operating body, A first electric switch that is turned on and off, and a second electric switch that is energized by a second leaf spring and that is turned on and off by the displacement of the second operating body, in a synthetic resin housing. In the three-operation type pressure switch provided, when the pressure is low and when the pressure is high, the first and third reversing disks displace the first operating body in the opposite direction to reciprocate, and Of the pair of electrical contacts of the switch,
The first electric switch is turned on and off by causing one electric contact to follow and reciprocate with the other electric contact by following the reciprocating motion of the first operating body, so as to turn on and off the first electric switch. A bead for supporting an intermediate portion of the surface portion of the reversing disk is formed at the protruding end of a cylindrical body molded at the bottom of the housing, and a groove is formed to divide the cylindrical body in a diametric direction. 3. A three-action pressure switch, wherein first and second leaf springs are arranged in the groove so as to extend from one divided portion of the bead to the other divided portion.