JPH0117785Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to two independent switches that are installed in the high-pressure side refrigerant passage of an automobile cooling system and detect the high-pressure side pressure of the refrigeration cycle. The present invention relates to a two-action operating switch that facilitates pressure adjustment inside.

Conventionally, this type of switch has had the following background. That is, when the high pressure side pressure is normal,
Depending on the size of the refrigeration load, etc., the condensing capacity of the condenser may be controlled to keep the high pressure side pressure within the normal range. For this purpose, when the pressure on the high pressure side becomes higher than a predetermined pressure, the electric contact is closed to increase the condensing capacity, and when the pressure on the high pressure side becomes lower than another pressure lower than said pressure,
A mechanism is required to open the contact and reduce the condensing capacity, and a pressure switch is required that has an operational difference in the pressure at which such a contact opens and closes.

The present invention was developed in view of the above drawbacks of the conventional technology, and its purpose is to maintain the pressure on the high pressure side at an appropriate level by installing a pressure switch in two stages to control the pressure on the high pressure side. is a pressure switch that has a pressure receiving chamber communicating with a pressure inlet on the upper surface of a diaphragm whose periphery is sandwiched between an upper body and a lower body. A second housing chamber with a small diameter is provided via a stop portion, and a tapered recess is formed in the bottom of the second housing chamber, and a piston is housed in the first housing chamber so as to be movable up and down and has a hole in the center. houses a second reversible disk having a snap function and protrudes upward;
On the first reversible disk having a snap function that is attached to the tapered recess of the second storage chamber and protrudes upward, a first space and a second space are provided in a cross shape on the top surface, and a guide hole is provided in the center. A first fixed contact provided on one of a pair of terminals having a lower end protruding outside the lower body, with the piston in contact with the upper surface of the holder, and the other A first electrical switching section consisting of a first movable contact provided on a first leaf spring attached to a terminal is housed in the first space of the holder, and a first electrical switching section is housed in the first space of the holder, and the lower end is also attached to one of the pair of terminals whose lower end protrudes outside the lower body. A second electrical switching section consisting of a second fixed contact provided and a second movable contact attached to a second leaf spring connected to the other terminal is accommodated in the second space of the holder and inserted into the guide hole of the holder. The first rod inserted into the piston locks the first reversing disc and the first leaf spring, and the second rod inserted through the hole in the piston locks the second leaf spring and the second reversing disc. That is.

An embodiment of the present invention will be described with reference to the drawings. The peripheral part of the diaphragm 4 and the packing 5 are airtightly sandwiched between an upper body 2 having a pressure introduction port 1 and a lower body 3 made of an insulating material. 6, and a pressure receiving chamber 7 communicating with the inlet 1 is formed in the upper body 2 above the diaphragm.

A locking step 9 is provided continuously at the lower part of the large-diameter first storage chamber 8 provided in the upper part of the lower body 3, and a small-diameter second storage chamber 10 is provided through the locking step 9 at the center of the bottom surface. A tapered portion 11 is provided in the second storage chamber 10, and the second storage chamber 10 communicates with the outside through a communication hole 12.

14 is a piston housed in the first storage chamber 8 so as to be able to move up and down, and has an upright portion 15 on the periphery of its upper surface;
A hole 16 is bored in the vertical direction at the center of a recess 13 formed inside the upright part 15.

A first space 18 and a second space 19 are provided in a cross shape on the upper surface of the holder 17 which is housed in the second storage chamber 10 so as to be vertically movable, and a vertical guide hole 20 is provided in the center of the holder 17. establish. Further, an annular protrusion 21 is provided on the periphery of the bottom surface of the holder 17, and the upper surface of the holder 17 is engaged with the lower surface of the piston 14.

22 is a second reversible disk located between the diaphragm 4 and the piston 14 and housed in the upright portion 15 of the piston 14, which has a snap function, and which normally protrudes upward and prevents the inside of the pressure receiving chamber 7. When the pressure becomes higher than the third set pressure P3, it reverses downward,
Further, when the pressure becomes lower than the fourth set pressure, the pressure returns upward and reverses.

An annular protrusion 21 provided on the lower surface of the holder 17
The first reversing disc 24 that is engaged with the pressure receiving chamber 7 has a snap function and is engaged with the tapered recess 11 and normally protrudes upward.
When the pressure becomes higher than the set pressure P1, it reverses downward and the first
When the pressure becomes lower than the second set pressure P2, which is smaller than the set pressure P1, the pressure returns upward. Note that the reversing operating pressure of the first reversing disk 24 is set lower than the reversing operating pressure of the second reversing disk 22.

Reference numerals 26 and 27 denote a pair of second terminals constituting the second electrical switching section 28, whose lower ends protrude outside the lower body 3, and whose upper parts are respectively bent inward to form folded pieces 26a and 27a. A second fixed contact 29 is provided on the piece 26a.
and the second terminal with the base attached to the other terminal 27.
The leaf spring 30 has an upward elastic force, and the second movable contact 31 attached to the lower surface of the tip and the second fixed contact 29 form a second electrical switching section 28 . It is accommodated in the second space 19 of the holder 17.

Reference numerals 33 and 34 designate a pair of first terminals, each of which has a bent piece 33 whose lower end protrudes outside the lower body 3 and is formed by bending the upper part inward so as to be shifted 90 degrees from the second terminal.
a, 34a are located in the first space 18, and the bent pieces 33a, 34a restrict upward movement of the holder 17.

A first fixed contact 37 is attached to the bending piece 33a that is one terminal, and a first leaf spring 35 with a base attached to the other terminal 34 is bent to maintain upward elastic force, and the bottom surface of the tip is bent. The first movable contact 3 attached to
6 and the first fixed contact 37 form a first electrical switching section 38.

A second rod 42 is inserted into the hole 16 of the piston 14 and is engaged between the lower surface of the second reversing disk 22 and the upper surface of the second leaf spring 30. Insert into the guide hole 20,
It is locked between the lower surface of the first leaf spring 35 and the upper surface of the first reversing disk 24.

Next, to explain the operation of this embodiment, the second
The figure shows a state in which the pressure entering the pressure receiving chamber 7 from the pressure introduction port 1 is lower than the first set pressure P1, and the piston 14 does not descend, so the second reversing disk 22 does not operate and protrudes upward. As it is, the second electric opening/closing part 28 is open, and the holder 17 is not lowered and the first electric opening/closing part 38 is also open (Fig. 3), but the first leaf spring 35 is Since it is lifted upward, the first electrical switching section 38 will not close due to malfunction. Furthermore, the pressure receiving chamber 7
When the internal pressure becomes higher than the first set pressure P1, the second reversing disk 22 pushes down the piston 14 without reversing downward.

When the piston 14 is pushed down until it is locked with the locking step 9, the holder 17 that locks on the bottom surface of the piston 14 is also pushed down, and the first reversing disk 24 is moved downward by the protrusion 21 on the bottom surface of the holder. As a result, the first rod 40 further descends, and the first movable contact 36 of the first leaf spring 35, which has descended accordingly, contacts the first fixed contact 37 and closes the first electrical switching part 38. (Figure 5). In this case, the second inversion disk 22 has not yet been inverted downward, and the second electrical switch 28 is open (FIG. 4).

Then, the pressure in the pressure receiving chamber 7 reaches the third set pressure P3.
When it becomes larger, the second reversing disk 22 is reversed downward and the second rod 42 is pressed down, and the second leaf spring 30 is pressed down, closing the first electric opening/closing part 28 ( Figure 6). In this case, the first reversing disk 24 is pushed down and reversed by the protrusion 21 on the lower surface of the holder 17, so the first electrical switching section 38 remains closed (FIG. 7).

When the pressure in the pressure receiving chamber 7 becomes lower than the fourth set pressure P4 and higher than the first set pressure P1, the second reversing disk 22 returns upward and reverses, and the second electric switch section 28 opens. (Figure 4). Further, when the pressure within the pressure receiving chamber 7 becomes lower than the second set pressure P2, the first reversing disk 24 returns upward and reverses, thereby closing the first electric switching section 38.

The present invention has the following effects.

By using two reversing disks instead of springs, the switch can be made smaller.

Since the two electrical switching parts each have an operating hysteresis, it prevents contact chatter and noise, thereby reducing the number of switch opening and closing operations, and prevents wear on each contact to increase durability. can.

Because a reversible disk is used instead of a bulky spring to push up the holder and piston, the overall shape is smaller and lighter.

2 with first and second electrical opening/closing parts provided on the holder
It is easy to assemble because it can be housed in one space and assembled at one time, and since it does not have movable lead wires, it is easy to design electrical paths, and it is durable with few failures.

Since each set pressure is independent, the pressure of the first and second electrical switching parts can be adjusted even after the terminal is attached to the lower body.

Since the second and third set pressures utilize the reversing operation of the reversing disk, the switch can be changed instantaneously.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention. Figure 1 is an exploded perspective view of the entire lower body with the upper body omitted, and Figures 2, 3, 4, 5, 6, and 7 are cross-sectional views showing each operating state. 8 are explanatory diagrams showing the relationship between each set pressure and the first and second electrical switching parts. 1... Pressure introduction port, 2... Upper body, 3... Lower body, 4... Diaphragm, 7... Pressure receiving chamber, 14...
...Piston, 15...Rise part, 17...Holder, 21...Protrusion part, 26, 27, 33, 34...
...Terminal, 28...Second electrical switching section, 38...First
Electric switchgear.

Claims (1)

[Scope of utility model registration request] In a pressure switch that has a pressure receiving chamber communicating with a pressure introduction port on the upper surface of a diaphragm whose periphery is sandwiched between an upper body and a lower body, it is locked below a first storage chamber provided at the upper part of the lower body. A small-diameter second storage chamber is provided via a step, and a tapered recess is formed in the bottom of the second storage chamber, and a piston is housed in the first storage chamber so as to be movable up and down, and has a hole in the center. A second reversing disk having a snap function is housed in a manner that projects upward, and a first inversion disk having a snap function is installed in a tapered recessed portion of the second storage chamber to protrude upward.
On the inversion disk, a first space and a second space are provided in a cross shape on the top surface, and an annular protrusion provided on the bottom surface of the holder having a guide hole in the center is placed. A first electric contact comprising a first fixed contact provided on one of a pair of terminals that abut the piston and whose lower end protrudes outside the lower body, and a first movable contact attached to a first leaf spring connected to the other terminal. The opening/closing part is accommodated in the first space of the holder, and a second fixed contact is provided on one of a pair of terminals whose lower ends protrude outside the lower body, and a second fixed contact is provided on a second leaf spring connected to the other terminal. A second electrical opening/closing part consisting of two movable contacts is housed in the second space of the holder, the first rod inserted through the guide hole of the holder locks the first reversing disk and the first leaf spring, and A two-action operating switch in which a second leaf spring and a second reversing disk are engaged by a second rod inserted through a hole in a piston.