JPS642355Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a three-action pressure switch installed in a refrigerant passage on the high pressure side of an automobile cooling system.

``Prior art'' A switch that opens an electrical contact to stop a compressor when the pressure on the high pressure side of a refrigeration cycle drops or rises abnormally, and a switch that stops the compressor when the pressure on the high pressure side is under normal conditions.
For example, Japanese Utility Model Application No. 59-82936 is a pressure switch having a switch that can arbitrarily determine the pressure for switching the electrical contact between open and close.

``Problem that the invention seeks to solve'' However, conventional switches of this type incorporate the high voltage and low voltage electrical switching parts into the main body, then incorporate the high voltage reversing disc, and then incorporate the medium voltage electrical switching parts into the main body. Since the structure is such that the opening/closing part is incorporated and the reversing disc for medium voltage is incorporated, it is possible to reselect the reversing disc for high voltage, which has a different reversing timing, after installing the electrical switching part for medium voltage. First, in order to do so, it was necessary to disassemble it again, and it was not possible to easily reselect it, so it had the disadvantage of extremely low work efficiency.

"Means for Solving the Problems" In view of the drawbacks of the conventional art, the present invention provides a hole in the center of one of the reversing discs, thereby assembling two sets of first and second electrical switching parts in the main body. After loading, the two reversible disks can be folded in. Its structure is such that a diaphragm is fixed between the upper body and the lower body, and the diaphragm is used to create a pressure receiving chamber and an operating chamber. In a separate pressure switch, a first piston is equipped with a first reversing disk from the diaphragm side, a second piston is equipped with a second reversing disk that is engaged with the lower surface of the first piston, and a second piston is installed on the upper side. A pair of upright parts are locked to the lower surface of the second piston, and a holder is spring-loaded from below and movable up and down within a certain range. First and second electrical opening/closing parts each formed by a leaf spring are formed on the first, second, third, and fourth fixed terminal plates that are protruded and fixed to the lower body, and are operated by reversing the first reversing disk. The rod is passed through the center of each of the first piston, the second reversing disk, the second piston, and the third leaf spring and comes into contact with the first leaf spring, and the rod is operated by reversing the second reversing disk. The present invention is characterized in that a cylinder is inserted through the rod and through the centers of the second piston and the third leaf spring to abut on the second leaf spring.

"Function" After the first and second electric switching parts are installed in the operating chamber, two sets of reversing discs are installed above them.
The disks can be selected at the same time or easily replaced with other disks.

"Embodiment" To explain an embodiment of the present invention with reference to the drawings, a main body 6 is formed by fixing the peripheral edge of a diaphragm 4 and a packing 5 between an upper body 2 and a lower body 3 having a pressure introduction port 1. The interior of this main body is divided by a diaphragm 4 into a pressure receiving chamber 7 and an operating chamber 8, which communicate with the inlet. This lower body 3 is made of an insulating material, and has a locking step 9 formed on the upper peripheral surface of the operating chamber, a recessed chamber 10 formed in the center of the bottom surface, and an external A small hole 11 communicating with the recessed chamber is provided, and furthermore, holes 12 and 12 for penetrating and fixing a fixed terminal, which will be described later, are passed through the periphery of the recessed chamber. 15 is a holder housed in the recessed chamber 10 so as to be movable up and down;
A small diameter portion 17 is provided at the bottom via a stop step portion 16.
protrudes from the small hole 11 to the outside, and fits a stop ring that allows this holder to move up and down only within a certain range,
Moreover, a spring 19 is activated between the bottom surface of the recessed chamber 10 and an annular step 18 provided at the top of the holder, thereby constantly urging the holder upward. Furthermore, the upper surface of the holder 15 is provided with a pair of raised parts 21 having a space 20 therebetween.

Reference numerals 25 and 30 designate first and second pistons respectively housed in a large diameter chamber 13 formed from the upper part of the working chamber 8 to the locking step 9 so as to be able to move up and down. On the upper surface of this first piston 25 is a first reversing disk 23 with a slightly smaller diameter.
A first accommodating portion 26 for accommodating the is provided, a through hole 27 is formed in the center, and a protruding portion 28 is formed on the lower surface. A second accommodating portion 31 is formed on the upper surface of the second piston 30 to accommodate the second reversing disk 35 and the protruding portion 28 of the first piston, and a large diameter insertion hole 32 is formed in the center of the second piston. Form. Also the second
A through hole 36 having the same diameter as the through hole 27 is formed in the center of the reversing disk 35, and the upper part of the raised portion 21 of the holder is in contact with the bottom surface of the second piston 30.

Reference numerals 38 and 39 denote first and second members whose lower ends protrude outside the lower body 3 and are fixed by passing through the holes 12 and 12, respectively.
2 fixed terminal plates, a first plate spring 40 whose rear end is fixed to one terminal plate 38 passes through the space 20, and a first movable contact 41 is attached downward to the tip;
This and the first fixed contact 42 fixed to the other terminal plate 39 form a first electrical switching section 43 .

45 and 46 are third members whose lower ends protrude outside the lower body 3 and are fixed by passing through the holes 12 and 12, respectively.
4 fixed terminal board, and a second terminal board whose rear end is fixed to a semicircular mounting part 47 formed on the upper part of one terminal board 45.
A second movable contact 49 is attached upward to the tip of the leaf spring 48, and the tip piece 48a of the second leaf spring is positioned so as to be locked from the lower side of the mounting portion 47.
In addition, the through hole 27 is provided in the center of the second leaf spring 48.
A through hole 50 having the same diameter as the through hole 36 is formed. The third leaf spring 5 has one end fixed to the upper part of the fourth fixed terminal plate 46
A third movable contact 49 that is separated from the second movable contact 49 at the tip of the
A movable contact 52 is formed, and the third movable contact 52 and the second movable contact 49 form a second electrical switching section 53. At the center of this third plate spring 51, the second
An insertion hole 54 having the same diameter as the insertion hole 32 provided at the center of the piston is formed, and a cylindrical actuating cylinder 55 is inserted into the insertion holes 32 and 54 so that the lower part thereof is connected to the second plate spring 5.
It is in contact with 1. Here, the third leaf spring 51 has a resilient force for opening the second electrical opening/closing part 53, and can lift the unloaded second piston 30 upward. Further, the first leaf spring 40 has a return force that opens the first electrical switching section 43. In the figure, a rod 56 passes through the through hole 27, the through hole 36, the operating cylinder 55, and the through hole 50.

Next, to explain the operation of this embodiment, the pressure inside the pressure receiving chamber 7 is set to the first set pressure P ₁ shown in FIG.
In the following cases, the holder 1 is
5 is lifted upward by a spring 19 until the retaining ring 18 is engaged with the lower body 3, and the first and second pistons 25, 30 are lifted by the upright part 21 present in this holder.
are pushed upward, respectively, and the first and second
Electric switching parts 43 and 53 are each open. Furthermore, the first and second reversing disks 23 and 35 do not invert, but are convex upwardly, and as a result, no pressing force is applied to the rod 56 and the actuating cylinder 55.

In Figure 3, the pressure P in the pressure receiving chamber 7 is the first set pressure P ₁
is larger than the second set pressure P ₂ (P ₃ ), that is, P ₁ ≦P<P ₂ (P ₃ ), and the pressure P is applied via the diaphragm 4 to the elastic force of the spring 19. Push down the holder 15 against the
The pistons 25 and 30 are pushed down, and the bottom surface of the second piston 30 pushes down the third movable contact 52 attached to the third plate spring 51 to open the second electrical switching section 53.
close. In this case, the first and second inversion disks 25,
35 has not yet been reversed and the rod 56 is not activated, so the first electrical switching section 43 is open.

In Figure 4, the pressure P in the pressure receiving chamber 7 is the second set pressure P ₂
(P ₃ ) and smaller than the fourth set pressure P ₄ (P ₅ ), that is, P ₂ (P ₃ )≦P≦P ₄ (P ₅ ), and the first inversion disk 23 is reversed downward by the pressure P, pushing down the rod 56, and further pushing down the first leaf spring 40 to close the first electric opening/closing part 43. In this case, the second reversing disc 35 has not yet been reversed and the second electric switching section 53 is closed, but after the reversing, the first reversing disc 23 is moved upward again at a pressure lower than the third set pressure _P3 . The first electrical switching section 43 is opened by returning and reversing, and an operating difference is provided between opening and closing.

In Figure 5, the pressure P in the pressure receiving chamber 7 is the fourth set pressure P ₄
(P ₅ ), the second reversing disk 35 is also reversed downward and pushes down the second plate spring 48 via the actuating cylinder 55 to push down the second movable contact 49 and move the second electric switching section 53 down. Open. In this case, the first piston 2
5, the second reversing disc 35 reverses downward and moves downward, and the rod 56 also descends, but this is absorbed by the deflection of the first leaf spring 40, and the first electrical switching section 43 remains closed. It is.

"Effects of the invention" The present invention as described above has the following effects.

By providing a through hole in the center of the second reversing disk, the first and second reversing disks can be assembled into the main body after the first and second electrical switching parts are assembled into the main body, thereby increasing the strength of the reversing disk. By reselecting, the operating timing can be easily adjusted.

The first and second electric opening/closing parts use a reversal load, a return reversal load, and the elastic force of each leaf spring, so that the structure is simple and can be made smaller and lighter.

Since the second and fourth set pressures on the high pressure side utilize the reversing operation of the reversing disk, switching can be performed instantaneously.

2nd and 4th where the 1st and 2nd electric switching parts close and open
By providing a hysteresis in the set pressure, chattering of the switch can be prevented and the durability of the contact points can be increased.

Since this device can function as three pressure switches, it can be made smaller and lighter, and is extremely convenient to handle.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is an exploded perspective view of the whole, Figs. 2, 3, 4, and 5 are cross-sectional views showing each operating state, and Fig. 6 is an exploded perspective view of the entire device. FIG. 3 is a cross-sectional view of the opening/closing section in operation. 4...Diaphragm, 6...Main body, 7...Pressure receiving chamber, 8...Working chamber, 15...Holder, 19...
Spring, 21... Standing part, 23, 35... Inversion disk, 25, 30... Piston, 38, 39, 4
5, 46...Fixed terminal board, 43, 53...Electrical switch section, 55...Actuation cylinder, 56...Rod.

Claims (1)

[Scope of utility model registration request] In a pressure switch in which a body is formed by fixing a diaphragm between an upper body and a lower body and the inside of the body is divided into a pressure-receiving chamber and an operating chamber by the diaphragm, a first piston with a first reversing disk attached from the diaphragm side, a second piston with a second reversing disk attached to the underside of the first piston, and a holder with a pair of raised parts provided on the upper part engaged with the underside of the second piston and resilient from below by a spring to move up and down within a certain range are each housed in the operating chamber so as to be movable up and down, and first and second electric opening and closing parts formed of leaf springs are formed on first, second, third and fourth fixed terminal plates fixed to the lower body with their lower ends protruding outside the body, and a rod operated by the reversal of the first reversing disk is connected to the first piston, the second reversing disk,
A three-action pressure switch in which an actuating cylinder which penetrates the centers of the second piston and the third leaf spring and abuts against the first leaf spring and is operated by the reversal of the second reversal disk is inserted into the rod and penetrates the centers of the second piston and the third leaf spring and abuts against the second leaf spring.