JP2003059377A - Switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switch structure preventing falling of the welded part of a receiving member, a diaphragm and a stopper. SOLUTION: This switch opens and closes contacts 82, 83 by an operation bar 6 acting in accordance with a operation of a diaphragm 3 comprising a designated number of layers of thin metal plates. The diaphragm 3 is welded together with a receiving member 2 and a stopper member 4 in one body and the stopper member 4 is provided with a reinforcement plate 5 and an operation rod guide member 5A arranged on the stopper member 4. The reinforcement plate 5 and the operation rod guide member 5A are constructed as a guide member of the operation bar 6 and the reinforcement plate 5 together with the receiving member 2 is caulked and fixed by a main body 1.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to switches, and more particularly to pressure switches operating at high pressure.

[0002]

2. Description of the Related Art The structure of a pressure switch operated by pressure in a refrigerating cycle such as a refrigerating / cooling apparatus will be described with reference to FIG. FIG. 4 is a vertical cross-sectional view illustrating the structure of the pressure switch.

The pressure switch comprises a body 101, a receiving member 102, a diaphragm 103, a stopper 104,
It is composed of a guide 105, an actuation rod 106, a case 107, and a switch 108.

The receiving member 102 is formed in a disc shape having a pressure introducing opening 121 projecting downward at the center thereof.
A pipe 122 communicating with the pressure space is fixed to the opening 121 by brazing or the like. Diaphragm 103
Is formed by laminating a plurality of thin metal disks formed in a disk shape having a central portion bulging on one side. The stopper 104 is configured as a metal disc that withstands pressure. The receiving member 102, the diaphragm 103, and the stopper 104 are laminated, and the periphery thereof is welded 109 to be integrated, and the diaphragm 103 is inverted by the pressure of the fluid introduced from the pressure introducing opening 121.

On the stopper 104, a guide 105 having an actuating rod 106 penetrating through an inner hole 152 is mounted, and a case 107 in which a switch 108 is provided in the inner space is mounted on the guide 105.
Is mounted, and a step provided around the lower part of the case 107 is crimped by the main body 101 to be integrated with each other to form a switch.

In the switch having such a structure, the case 107 made of a plastic material is used, and the receiving member 102 is formed.
Since the diaphragm 103 and the stopper 104 are fixed by caulking and assembled, the welded portion 109 cannot be pressed with sufficient strength, and depending on the magnitude of the applied pressure,
There is a problem that fatigue damage may occur in the welded portion 109.

[0007]

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a switch structure having a structure in which a portion where a receiving member, a diaphragm and a stopper are integrally welded is hard to peel off in a pressure switch. To aim. Furthermore, the present invention improves the guiding accuracy of the operating rod in a pressure switch in which the receiving member, the diaphragm, and the stopper member, which are integrated in the welded portion, do not cause fatigue failure due to the magnitude of the applied pressure. , And waterproof structure.

[0008]

In order to solve the above-mentioned problems, the present invention relates to a switch for opening and closing contacts by an operating rod that operates in response to the operation of a diaphragm formed by laminating a predetermined number of thin metal plates. The diaphragm is integrally welded together with a receiving member and a stopper member, and a reinforcing plate and an operating rod guide member that serve as a guide member for the operating rod are provided on the stopper member. It has a structure to be fixed by crimping.

In the present invention, the welding for integrating the diaphragm, the receiving member and the stopper member is performed by plasma welding in two steps.

In the present invention, an outer case is covered on the outside of the switch, and a filler is filled between the switch and the outer case.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION [First Embodiment] A first embodiment of a pressure switch according to the present invention will be described below with reference to FIG. FIG. 1 is a vertical cross-sectional view illustrating the structure of a pressure switch according to the present invention.

The pressure switch according to the present invention comprises a pressure switch body 1, a receiving member 2, a diaphragm 3, a stopper member 4, a reinforcing plate 5, an operating rod 6, a case 7,
And a switch 8.

The pressure switch body 1 is made of aluminum and is formed in a shape similar to a cylinder having upper and lower openings. The pressure switch body 1 has a receiving surface 11 that is bent inward downward, a step portion 12 that extends outward in an intermediate portion, and a rising portion 13 that is thinly formed upward.

The receiving member 2 is made of metal such as stainless steel, and is formed in a disk shape having a bulged portion on the outside. A pipe 22 connected to the pressure space is inserted in the center of the receiving member 2 and has an opening 21 fixed by brazing or the like.
3 is formed.

The diaphragm 3 is made of a thin plate of metal, for example, stainless steel, and is formed in a disk shape having an outwardly bulged portion, and a plurality of diaphragms 3 are stacked to cope with high pressure. .

The stopper member 4 is made of metal such as stainless steel, and is formed in a flat disk shape having a sufficient thickness to withstand high pressure. An opening 43 through which the operating rod 6 penetrates is provided at the center of the stopper member 4.

The receiving member 2, the diaphragm 3 and the stopper member 4 are formed to have substantially the same outer diameter, and the peripheral upper surface of the receiving member 2 is located on the peripheral lower surface 31 of the diaphragm 3 and the peripheral upper surface 32 of the diaphragm 3 is located on the peripheral lower surface 31. The stopper member 4 is stacked so that the peripheral lower surface 41 is in contact,
6, 33, 44 are integrated by electric welding in the presence of an inert gas.

The reinforcing plate 5 is made of metal such as stainless steel, has a flat surface 51 on the lower surface, an annular receiving groove 55 is formed on the upper surface, and is thinly formed outside the annular groove 55. A rising portion 53 is provided. further,
A crimp receiving portion 54 is formed outside the rising portion 53 of the reinforcing plate 5, and a guide hole 52 for guiding the operating rod 6 is provided in the center portion.

The operating rod 6 is a rod-shaped body made of a rigid member, and is inserted into the guide hole 52 of the reinforcing plate 5.

The case 7 is made of a resin material such as unsaturated polyester resin or phenol resin, and is formed in a container shape having an internal space 74. A caulking receiving portion 71 is formed near the open end of the outer wall of the case 7, and an end surface 72 that fits into the annular groove 55 of the reinforcing plate 5 is formed at the open end, and the bottom of the case 7 is further formed. A terminal insertion hole 73 for inserting and penetrating the terminal is provided.

The switch 8 includes the upper surface of the reinforcing plate 5 and the case 7.
A movable spring 81 housed in an internal space 74 formed by a contact 82 provided at one end and fixed to the end of one terminal 84 at the other end; and a contact 83 fixed to the end of the other terminal. Composed of. The terminal 84 is inserted and fixed in a terminal insertion hole 73 provided in the case 7.

The receiving member 2, the diaphragm 3 and the stopper member 4 which are integrated by the welding 9 are integrated into the pressure switch body 1.
The reinforcing plate 5 is placed on the above, and the caulking receiving portion 54 of the reinforcing plate 5 is caulked and fixed by the rising portion 13 of the pressure switch main body 1 to form a mechanism for detecting pressure.

Reinforcing plate 5 with actuating rod 6 inserted in guide hole 52
The opening end 72 of the case 7 having the switch 8 formed thereon is placed in the annular groove 55, and the caulking receiving portion 71 of the case 7 is caulked and fixed by the rising portion 53 of the reinforcing plate 5 to form a pressure switch.

The lower surface 24 of the outer peripheral portion of the receiving member 2 is in close contact with the receiving surface 11 provided below the pressure switch body 1.
The upper surface 42 of the stopper member 4 is in close contact with the lower surface 51 of the reinforcing plate 5. Lower surface 51 of reinforcing plate 5 and pressure switch body 1
There is a minute gap between the step portion 12 and the step portion 12, and the caulking force by the rising portion 13 is transmitted to the first receiving surface 11 via the reinforcing plate 5-stopper member 4-diaphragm 3-receiving member 2.

A second example of the first embodiment of the pressure switch according to the present invention will be described with reference to FIG. FIG. 2 is a vertical cross-sectional view for explaining the structure of a high-pressure cutoff type pressure switch in which the guiding accuracy of the operating rod is improved.

In FIG. 2, the pressure switch body 1, the receiving member 2, the diaphragm 3, the stopper member 4, the reinforcing plate 5, the operating rod guide member 5A, the operating rod 6, the case 7, and the switch 8 are provided. And an outer case 9A.

The pressure switch body 1 is made of iron and is formed in a shape similar to a cylinder having upper and lower openings. The pressure switch body 1 has a receiving surface 11 that is bent inward downward, a step portion 12 that extends outward in an intermediate portion, and a rising portion 13 that is thinly formed upward.

The receiving member 2 is made of metal such as stainless steel, and is formed in a disk shape having a bulged portion on the outside. A pipe 22 connected to the pressure space is inserted in the center of the receiving member 2 and has an opening 21 fixed by brazing or the like.
3 is formed.

The diaphragm 3 is made of a thin plate of metal such as stainless steel, and is formed in a disk shape having an outwardly bulged portion, and a plurality of diaphragms 3 are stacked to cope with high pressure. .

The stopper member 4 is made of metal such as stainless steel, and has a flat disk shape. An opening 43 is provided at the center of the stopper member 4 so that the operating rod 6 is guided and penetrates therethrough.

The receiving member 2, the diaphragm 3, and the stopper member 4 are formed to have substantially the same outer diameter, and the peripheral upper surface of the receiving member 2 is located on the peripheral lower surface 31 of the diaphragm 3 and the peripheral upper surface 32 of the diaphragm 3. The stopper member 4 is stacked so that the peripheral lower surface 41 is in contact,
6, 33 and 44 are integrated by plasma welding in the presence of an inert gas.

The reinforcing plate 5 is made of metal such as brass and has a flat surface 51 on the lower surface and a flat surface 55 on the upper surface.
A rising portion 53 thinly formed outside the flat surface 55 of the upper surface
Is provided. Further, a caulking receiving portion 54 is formed outside the rising portion 53 of the reinforcing plate 5, and a guide hole 52 for guiding the operating rod 6 is provided in the center portion.

The actuating rod guide member 5A is made of resin such as polyethylene, and is formed into a disc shape with its upper surface protruding upward and its lower surface being pulled inward. Actuating rod guide member 5
A is a guide hole 5 that vertically penetrates through the center and guides the operating rod 6.
A1 has guide projections 5A2 and 5A3 at the upper and lower ends of the guide hole 5A1, an annular bank 5A4 abutting the upper surface 55 of the reinforcing plate 5 at the lower peripheral portion, and a case 7 at the upper peripheral surface. Receiving portions 5A5 that come into contact with the stepped portions 75 are provided respectively.

The operating rod 6 is a rod-shaped body made of a member having rigidity, and is inserted into the guide hole 52 of the reinforcing plate 5 and the guide hole 5A1 of the operating rod guide member 5A.

The case 7 is made of a resin material such as unsaturated polyester resin or phenol resin, and is formed in a container shape having an internal space 74. A caulking receiving portion 71 is formed in the vicinity of the opening end of the outer wall of the case 7, and an end surface 72 to be placed on the upper flat surface 55 of the reinforcing plate 5 is formed at the opening end, and the bottom of the case 7 is further formed. Is provided with a terminal insertion hole 73 for inserting and penetrating the terminal.
Further, the case 7 is provided with a stepped portion 75 which is in contact with the receiving portion 5A5 of the actuating rod guide member 5A near the opening end of the inner peripheral wall.

The switch 8 is housed in the internal space 74 formed by the upper surface of the actuating rod guide member 5A and the case 7, and has a movable contact 82 at one end and one terminal 8 at the other end.
The movable spring 81 fixed to the end of No. 4 and the fixed contact 83 fixed to the end of the other terminal. Terminal 8
4 is inserted and fixed in a terminal insertion hole 73 provided in the case 7. A lead wire 85 is connected and fixed to the terminal 84 by soldering.

The outer case 9A is a member that covers the upper outside of the pressure switch assembly, is made of a resin such as nylon 66, and has a substantially cylindrical shape, and has a lower end 9A1 and an internal space 9A2. . A resin 9B such as an epoxy resin is filled and solidified in the internal space 9A2, and airtightness and syrup are provided so that the terminal side of the pressure switch assembly does not directly contact the outside air, and the pressure switch has a waterproof structure. .

The receiving member 2, the diaphragm 3 and the stopper member 4 which are integrated by the welding 9 are integrated into the pressure switch body 1.
The reinforcing plate 5 is placed on this, and the caulking receiving portion 54 of the reinforcing plate 5 is caulked and fixed by the rising portion 13 of the pressure switch body 1 to provide a pressure sensing mechanism.

After mounting the operating rod guide member 5A on the flat upper surface 55 of the reinforcing plate 5 and inserting the operating rod 6 into the guide hole 52 and the guide hole 5A1, the opening end 72 of the case 7 having the switch 8 formed thereon is fixed. The receiving portion 5A5 of the actuation rod guide member 5A is fixed by the stepped portion 75, and the caulking receiving portion 71 of the case 7 is mounted.
Is caulked and fixed by the rising portion 53 of the reinforcing plate 5 to form a pressure switch assembly.

Thereafter, the lead wire 85 is soldered to the terminal 84, the outer case 9A is covered on the outer side thereof, and the epoxy resin 9B is filled and solidified in the inner space 9A2 formed between the assembly and the outer case 7. Complete the waterproof pressure switch.

This pressure switch works as a high pressure cutoff type pressure switch in which the operating rod 6 pushes up the spring 81 of the switch 8 to shut off the switch when the pressure exceeds a predetermined value and becomes high.

According to this structure, the receiving member 2, the diaphragm 3 and the stopper member 4 integrated by the welded portion 9 do not cause fatigue fracture due to the magnitude of the applied pressure. In addition, the operating rod 6 includes the reinforcing plate 5 and the operating rod guide member 5
Since it is guided by the guide holes 52 and 5A1 of A, the guide distance becomes long and the operating rod 6 can be guided with high accuracy. Furthermore, since the outer side of the pressure switch assembly is covered with the outer case 9A and the inner space 9A2 is filled with the filler 9B, a waterproof structure can be obtained.

A third example of the first embodiment of the pressure switch according to the present invention will be described with reference to the longitudinal sectional view shown in FIG. This pressure switch is a low pressure cutoff type pressure switch. The entire structure of this pressure switch is substantially the same as that of the pressure switch of FIG. 2 except for the switch 8 portion and the diaphragm 3, and the same portions as those of FIG. 2 are denoted by the same reference numerals.

The switch 8 portion is constructed as a low pressure cutoff type pressure switch which shuts off when the pressure becomes a predetermined value or less. Therefore, the fixed contact 83 is provided above and the movable contact 82 is provided below.

The diaphragm 3 is made of a thin plate of metal such as stainless steel, is formed in a disk shape having a bulged portion on the outer side, and a plurality of diaphragms 3 which are smaller than those in the example of FIG. 1 are laminated. It is designed to operate at low pressure.

[Second Embodiment of the Invention] A second embodiment of the pressure switch according to the present invention will be described with reference to FIG.
In this embodiment, the welding width of the welded portion is sufficiently secured and the weld penetration depth is made uniform. That is, according to the present invention, as shown in FIG. 5, the receiving member 2, the diaphragm 3 and the stopper member 4 which are formed to have substantially the same outer diameter are provided, and the peripheral upper surface of the receiving member 2 is located on the peripheral lower surface 31 of the diaphragm 3. It is characterized in that the peripheral upper surface 32 of the diaphragm 3 and the peripheral lower surface 41 of the stopper member 4 are stacked so as to be in contact with each other to form a stacked body, and the peripheries 26, 33, and 44 are welded in two steps. This welding is performed by first welding 91 the lower part of the periphery of the stack, then shifting the welding points and performing the second welding 92 of the upper part of the periphery of the stack. The first welding and the second welding are performed so that the welded portions partially overlap each other.

According to this welding method, the bead width of one welding can be made smaller than the method of welding the entire periphery of the stack in one round, so that welding can be performed at a low current. . Therefore, since the heat input can be reduced, it is possible to reduce adverse effects such as hardness reduction due to the tempering effect of heating the diaphragm 3, and it is possible to provide a pressure switch with high operation accuracy.

Further, by performing the two weldings by the plasma welding having a high heat input efficiency, it is possible to obtain the penetration depth at a lower current and a higher speed as compared with the TIG welding.

[0049]

According to the pressure switch having such a structure, the receiving member 2, the diaphragm 3 and the stopper member 4 which are integrated by the welding portion 9, the reinforcing plate 5 and the pressure switch main body 1 are provided.
Since it is firmly sandwiched by and, the pressure switch can be made highly reliable without causing fatigue failure due to the magnitude of the applied pressure.

Further, since the operating rod 6 is guided by the reinforcing plate 5 and the guide holes 52, 5A1 of the operating rod guide member 5A, the guiding distance becomes longer than that of the switch shown in FIG. A switch capable of guiding the operating rod 6 can be provided. Further, since the outer side of the switch assembly is covered with the outer case 9A and the inner space 9A2 is filled with the filling material 9B, it is possible to provide a switch having a waterproof structure.

[Brief description of drawings]

FIG. 1 is a vertical sectional view illustrating an embodiment of a pressure switch according to the present invention.

FIG. 2 is a vertical cross-sectional view illustrating another embodiment of the pressure switch according to the present invention.

FIG. 3 is a vertical sectional view for explaining still another embodiment of the pressure switch according to the present invention.

FIG. 4 is a vertical cross-sectional view illustrating the structure of a conventional pressure switch.

FIG. 5 is a view for explaining a welding method of the receiving member, the diaphragm and the stopper member in the pressure switch according to the present invention.

[Explanation of symbols]

1 Pressure switch body 11 Receiving surface 12 steps 13 Rise 2 Receiving member 21 opening 22 pipes 23 Pressure space 24 Lower surface 3 diaphragm 4 Stopper member 41 Lower surface 42 upper surface 43 openings 5 Reinforcement plate 51 Lower surface 52 guide hole 53 Rise 54 Caulking part 55 Flat surface 5A actuation rod guide member 5A1 guide hole 5A2 guide protrusion 5A3 guide protrusion 5A4 levee 5A5 receiving part 6 working rod 7 cases 71 Caulking part 72 End face 73 Terminal insertion hole 74 Internal space 75 steps 8 switches 81 spring 82, 83 contacts 84 terminals 85 lead wire 9, 91, 92 Weld 9A outer case 9A1 lower end 9A2 internal space 9B filler

Claims (3)

[Claims] 1. A switch for opening and closing contacts by means of an operating rod that operates in response to the operation of a diaphragm formed by laminating a predetermined number of thin metal plates, wherein the diaphragm is welded together with a receiving member and a stopper member to be integrated. The stopper member comprises a reinforcing plate and an operating rod guide member provided thereon, the reinforcing plate and the operating rod guide member are configured as guide members for the operating rod, and the reinforcing plate is the receiving member. At the same time, the switch is characterized by being fixed by crimping by the main body. 2. The switch according to claim 1, wherein the welding that integrates the diaphragm, the receiving member, and the stopper member is performed twice by plasma welding. 3. A switch characterized in that an outer case is covered on the outside of the switch according to claim 1 or 2, and a filler is filled between the switch and the outer case.