JP2017054780A - pressure switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure switch capable of suppressing cost by reducing the number of components in a pressure switch of a body ground structure using a metallic diaphragm.SOLUTION: A pressure switch 100 comprises: a conductive joint 111 including a duct 111a for supplying a pressure of an actuation medium; a diaphragm 200 which is displaced in response to the pressure of the actuation medium and has conductivity; a terminal 132 provided with a contact member fitting part 132a to fit a contact member which is brought into contact with the diaphragm 200, thereto when the diaphragm 200 is displaced to an atmospheric pressure side, and a signal transmission part 132b for transmitting an ON/OFF signal to an external circuit; and an insulative terminal block 131 for fixing the terminal 132. In the diaphragm 200, a bowl-shaped pressure reaction part 200a which is displaced in response to the pressure of the actuation medium is formed in a central part and a gear-shaped belleville spring part including a leaf spring 200b is formed in an outer peripheral part.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a pressure switch, and more particularly, to a body-structure pressure switch using a metal diaphragm.

  2. Description of the Related Art A diaphragm type pressure switch that detects a pressure of a working medium when controlling systems for air conditioning, air conditioning, automobiles, and industrial devices is known. In a diaphragm type pressure switch, a conductive path to a vehicle device or the like to which the pressure switch is attached is formed to form a body ground structure. In addition, a metal diaphragm that serves as one contact of the switch and a movable contact that is connected to the terminal and serves as the other contact of the switch are accommodated in a conductive body made of metal, and the diaphragm and the movable contact are in contact with each other. A contact-type pressure switch having a body earth structure is also known which is configured to take electrical continuity from the terminal to the body when the switch is turned on.

JP 2000-322966 A JP 2008-300311 A JP 2008-300312 A

  In Cited Document 1, a conductive disc spring is inserted into a joint on a conductive diaphragm component, a conductive internal terminal with an elastic arm fixed thereon is placed, and a connector is inserted from above. However, a pressure switch that is integrated by caulking at the caulking portion, in which the disc spring is always in elastic contact with the upper terminal and the outer joint, and forms a reliable body ground path is described. ing.

  Further, the cited document 2 is a pressure switch of a body earth structure having a disc spring, and the tip of the second projecting portion at the lower end of the cover is a flat portion, and is pressed against the plate portion of the disc spring, In addition, since the curved surface is formed on the inner side and the outer side of the flat portion of the second projecting portion, the inner spring portion and the outer spring portion of the disc spring are not plastically deformed, and the upper portion of the diaphragm structural member or the body A pressure switch is described that presses against the inner circumference with a stable contact pressure.

  Further, in Cited Document 3, the diaphragm structural member is integrated by sandwiching the metal diaphragm between the metal upper cover and the lower cover and laser welding the outer peripheral welded portion, and is generated by pressing the peripheral edge of the lower cover. The downward processing sag is housed in the burr housing recess formed at the peripheral edge of the bottom surface of the body housing hole, and the use of laser welding reduces the thermal distortion of the diaphragm and reduces the variation in spring characteristics. A pressure switch with stable switching characteristics is described.

  In the pressure switches described in the cited documents 1 to 3 as described above, the diaphragm assembly is arranged by welding the circumferences of the three parts of the diaphragm, the stopper, and the cap as the pressure receiving portion structure of the working medium. A disc spring is used to ensure reliability. For this reason, there exists a problem that the number of parts increases and cost increases.

  Accordingly, an object of the present invention is to provide a pressure switch having a body ground structure using a metal diaphragm, in which the number of components can be reduced and the cost can be reduced.

  In order to solve the above problems, a pressure switch of the present invention has a conductive working medium supply assembly having a conduit for supplying the pressure of the working medium, and is displaced in accordance with the pressure of the working medium and has conductivity. A diaphragm that is grounded through the working medium supply assembly, and a terminal that is provided on the atmospheric pressure side of the diaphragm, and the diaphragm is displaced at one end when the diaphragm is displaced to the atmospheric pressure side. When the diaphragm and the contact member are in contact with the contact member mounting portion to which the contact member that contacts the contact member is attached, and the other end opposite to the one end, the working medium supply assembly, the diaphragm, and the A contact member, a terminal provided with the signal sending part for sending an ON / OFF signal to an external circuit via the terminal, and the atmosphere of the diaphragm And an insulating terminal block for fixing the terminal. The diaphragm includes a bowl-shaped pressure responsive portion that is displaced in accordance with the pressure of the working medium at a central portion, and a leaf spring at an outer peripheral portion. And a tip of a leaf spring of the disc spring portion is brought into contact with the inner peripheral portion of the conductive working medium supply assembly in a springy manner.

  Moreover, the said disc spring part is formed in the gearwheel shape provided with a some leaf | plate spring in an outer peripheral part, The said some leaf | plate spring is bend | folded in an atmospheric pressure direction, and may produce the elastic force of a spring of a horizontal direction. .

  Further, the contact member is connected to a contact spring made of a conductive material attached to the contact member attachment portion of the terminal, and an end portion opposite to an end portion connected to the terminal of the contact spring, When the diaphragm is displaced to the atmospheric pressure side, a movable contact that contacts the diaphragm may be provided.

  Further, the working medium supply assembly may be a joint having a pipe line and caulking and fixing the diaphragm and the terminal block.

  Further, a stopper that restricts displacement of the diaphragm and enhances pressure resistance may be provided on the atmospheric pressure side of the diaphragm.

  According to the pressure switch of the present invention, by providing the diaphragm with a disc spring function, the conventional diaphragm, stopper, cap, and disc spring can be simplified into fewer parts and the cost can be reduced. Can do.

It is sectional drawing which shows the structure of the pressure switch of the body earth structure by a prior art. It is a figure which shows the diaphragm which has the disk spring function of the pressure switch of this invention. It is sectional drawing which shows the structure of the pressure switch which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the structure of the pressure switch which concerns on the 2nd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, a pressure switch having a body ground structure according to the prior art will be described.
FIG. 1 is a diagram showing a configuration of a pressure switch 100 having a body earth structure according to the prior art.

  In FIG. 1, a pressure switch 100 detects the pressure of a working medium for air conditioning, air conditioning, automobiles, and industrial equipment, and is connected via a conductive diaphragm assembly 120 and a conductive working medium supply assembly 110. It is a pressure switch having a body earth structure that provides electrical continuity to the bodies of air conditioners, air conditioners, automobiles, and industrial devices.

  The pressure switch 100 includes a working medium supply assembly 110 including a conductive joint 111 having a pipe line 111a for supplying the pressure of the working medium, a diaphragm assembly 120 having a diaphragm 121 that is displaced according to the pressure of the working medium, and a diaphragm. And an electrode fixing portion 130 for fixing a terminal 132 for sending an ON / OFF signal of an electrical switch in accordance with the displacement of 121.

  The working medium supply assembly 110 includes a joint 111, a working pressure side O-ring 112, and an atmospheric pressure side O-ring 113.

  The joint 111 includes a pipe line 111a that communicates with a pipe through which a working medium whose pressure is detected is guided, a pressure receiving chamber 111b that is formed conically expanding from one end of the pipe line 111a, and an outer peripheral portion of the pressure receiving chamber 111b. An annular groove, a groove portion 111c in which the ring-shaped operating pressure side O-ring 112 is disposed, and a concave portion formed in a columnar shape on the atmospheric pressure side of the pressure receiving chamber 111b, including a diaphragm assembly 120 and an electrode fixing portion 130d, and a caulking portion 111e for caulking and fixing the end of the electrode fixing portion 130. The joint 111 is formed of, for example, a metal material by press molding, cutting, die casting, forging, or the like. Here, the joint 111 is used, but instead, a conductive terminal of a pressure switch module on which a plurality of pressure switches can be mounted may be used.

  The working pressure side O-ring 112 is disposed in the groove 111c of the joint 111, is in close contact between the diaphragm assembly 120 and the joint 111, and seals the working medium from the pressure receiving chamber 111b.

  The atmospheric pressure side O-ring 113 is disposed in a groove 131b of the terminal block 131 of the electrode fixing unit 130, which will be described later. . The working pressure side O-ring 112 and the atmospheric pressure side O-ring 113 are annular elastic members, and are formed of a material having heat resistance.

  The diaphragm assembly 120 includes a diaphragm 121 that is displaced in accordance with a change in pressure of the working medium supplied from the pipe 111a, a stopper 122 that is disposed on the atmospheric pressure side of the diaphragm 121, and a cap that is disposed on the working medium side of the diaphragm 121. 123.

  Here, the diaphragm 121 is made of a metal having a reversing action, that is, a spring property for snap action. However, the diaphragm 121 is not limited to this, and may be a metal diaphragm without performing a snap action. When the diaphragm 121 that performs snap action is used, if the pressure of the working medium from the pipe line 111a is less than the set value, the shape of the working medium swells downward, and the pressure of the working medium from the pipe line 111a is reduced. When the value exceeds the set value, the shape swelled downward by the pressure of the working medium is reversibly reversed from the shape swelled upward.

  The stopper 122 is provided to increase the pressure resistance so as to limit the stroke of the diaphragm 121 and prevent the diaphragm 121 from being deformed by an excessive pressure and changing the pressure characteristics. In addition, an opening for moving up and down a movable contact 134 described later is provided at the center of the stopper 122. The cap 123 is a member having an opening communicating with the pressure receiving chamber 111 b at the center, and is provided to hold the diaphragm 121 together with the stopper 122. The stopper 122 and the cap 123 are formed of, for example, a metal material by press molding, cutting, die casting, forging, or the like, and are integrated by laser welding or the like while holding the diaphragm 121.

  In addition, the stopper 122 and the cap 123 are not limited to the above-mentioned example, For example, even if the outer periphery of the diaphragm 121 is supported by one support member in which the stopper 122 and the cap 123 are integrally formed. Good. Further, for example, the stopper 122 and the cap 123 as support members that support the outer periphery of the diaphragm 121 may be configured as a part of the joint 111 or a part of another device. Alternatively, the stopper 122 and the diaphragm 121 alone or the cap 123 and the diaphragm 121 alone may be used.

  The electrode fixing portion 130 is provided on the atmospheric pressure side of the diaphragm assembly 120 and has an L shape extending from a terminal block 131 for fixing the terminal 132 and a terminal receiving portion 131c, which will be described later, provided on the terminal block 131 to the contact member receiving portion 131a. A terminal 132 which is a metal part extending to the contact member, and a contact spring 133 which is attached to a contact member attaching portion 132a of the L-shaped terminal 132 and made of a U-shaped conductive material, and a U-shaped conductive material A movable contact 134 attached to an end of the contact spring 133 on the diaphragm assembly 120 side, and a disc spring 135 disposed between the diaphragm assembly 120 and the terminal block 131 are provided.

  The terminal block 131 is made of, for example, resin or the like in order to ensure insulation of the terminal 132. The terminal block 131 has a substantially cylindrical recess in the vicinity of the center on the diaphragm assembly 120 side, a contact member accommodating portion 131a for accommodating a contact member of the contact spring 133 and the movable contact 134, and a accommodating portion for the joint 111. It is a recess provided in the vicinity of the middle stage of the cylindrical shape that contacts 111d, a groove portion 131b in which the atmospheric pressure side O-ring 113 is disposed, and further to the atmospheric pressure side from the cylindrical shape that is accommodated in the accommodating portion 111d of the joint 111. A thin and substantially cylindrical shape is formed therein with a terminal accommodating portion 131c that accommodates a signal transmission portion 132b of a terminal 132 described later. The terminal block 131 can be changed in accordance with the shape of the terminal, and other shapes may be used.

  The terminal 132 has a contact member attachment portion 132a to which a contact spring 133 and a movable contact 134 that are contact members that come into contact with the diaphragm 121 when the diaphragm 121 is displaced to the atmospheric pressure side are attached to the diaphragm assembly 120 side. When the diaphragm 121 and the movable contact 134 come into contact with the end opposite to the member mounting portion 132a, an external circuit (not shown) is connected via the working medium supply assembly 110, the diaphragm assembly 120, the movable contact 134, the contact spring 133, and the terminal 132. And a signal sending unit 132b for sending an ON / OFF signal. In addition, although the shape of the terminal 132 was L-shaped here, it can be changed according to other components such as a contact member, and other shapes may be used.

  The contact spring 133 is attached to the contact member attachment portion 132a of the terminal 132 so that the U-shape is horizontally oriented in the vertical direction, and has the elastic force of the spring in the vertical direction. For this reason, when the diaphragm 121 and the movable contact 134 contact, it has a contact pressure of an up-down direction and can ensure reliable contact. In addition, although the shape of the contact spring 133 is a U-shape here, it can be changed according to other components, and other shapes may be used.

  The movable contact 134 is attached to the end of the U-shaped contact spring 133 on the diaphragm assembly 120 side, and becomes a contact that contacts when the diaphragm 121 is displaced to the atmospheric pressure side. In addition, the shape of the movable contact 134 can be changed according to other components, and other shapes may be used. Moreover, the contact spring 133 and the movable contact 134 constitute a contact member.

  The disc spring 135 is formed with a gear-shaped outer spring having a plurality of leaf springs bent in the atmospheric pressure direction on the outer peripheral portion, and is made of a metal material so as to have the elastic force of the horizontal spring. For this reason, the front-end | tip of a some leaf | plate spring is always contacted with the accommodating part 111d of the electroconductive coupling 111 with the elastic force of a spring, and forms a reliable body earth path | route. In addition, the disc spring 135 has a circular opening on the inside, and a plurality of notches are formed on the inner periphery of the opening, and the convex portion between the notches is bent toward the inner periphery. A spring may be formed. When the inner spring is formed, the elastic force of the vertical spring is generated, and the contact between the diaphragm assembly 120 and the terminal block 131 becomes strong.

  As a method of attaching the pressure switch 100, first, the diaphragm assembly 120 is assembled by welding or the like. Next, the electrode assembly 130 having the diaphragm assembly 120 and the terminal block 131 having the terminal 132 and the like fixed to the atmospheric pressure side is disposed in the housing portion 111d of the joint 111 of the working medium supply assembly 110. It is fixed by caulking by the caulking portion 111e. This attachment method is not limited, and various methods can be applied depending on the shape of the working medium supply assembly 110 and the like.

  In the conventional pressure switch 100 as described above, the diaphragm assembly 120 is configured by welding the circumferences of the three parts of the diaphragm 121, the stopper 122, and the cap 123 as the pressure receiving portion structure. A disc spring 135 is used to ensure conductive reliability. For this reason, there exists a problem that the number of parts increases too much and cost increases. Therefore, the pressure switch of the present invention simplifies the four parts of the conventional diaphragm 121, stopper 122, cap 123, and disk spring 135 by making the diaphragm have a disk spring function, thereby reducing the cost. can do.

  Next, the diaphragm 200 having a disc spring function used in the pressure switch of the present invention will be described.

FIG. 2 is a diagram showing a diaphragm 200 having a disc spring function of the pressure switch of the present invention.
In FIG. 2, the diaphragm 200 is a gear-shaped dish having a bowl-shaped pressure responsive portion 200 a that is displaced according to the pressure of the working medium at the center, and a plurality of leaf springs 200 b that are bent in the atmospheric pressure direction at the outer periphery. The spring portion is formed, and is formed of a metal material so as to have the elastic force of the spring in the horizontal direction. Therefore, in the diaphragm 200, the tips of the plurality of leaf springs 200b are always brought into contact with the inner peripheral portion of the conductive working medium supply assembly 110 by the elastic force of the springs, thereby forming a reliable body ground path. In addition, although the plate spring 200b of the disc spring part is provided with eight here, it is not limited to this, One may be sufficient. However, since it is necessary to stably contact the inner peripheral portion of the cylindrical working medium supply assembly 110, it is preferable to provide a certain number of leaf springs 200b. When one leaf spring 200b is provided, a copper member may be sandwiched between the inner periphery of the working medium supply assembly 110 and the diaphragm 200 to improve contact reliability.

  Next, a first embodiment of the present invention using the diaphragm 200 having the disc spring function shown in FIG. 2 will be described.

FIG. 3 is a cross-sectional view showing the structure of the pressure switch 300 according to the first embodiment of the present invention.
In FIG. 3, the pressure switch 300 mainly uses the diaphragm 200 having the disc spring function shown in FIG. 2 instead of the diaphragm assembly 120 as compared with the pressure switch 100 of the prior art shown in FIG. 1. Features. The same components as those of the pressure switch 100 shown in FIG.

  The pressure switch 300 includes a working medium supply assembly 110 including a conductive joint 111 having a pipe line 111a for supplying the pressure of the working medium, a diaphragm 200 that is displaced according to the pressure of the working medium and has a disc spring function, An electrode fixing unit 330 that fixes a terminal 132 that sends an ON / OFF signal of an electrical switch in accordance with the displacement of the diaphragm 200 is provided.

  The electrode fixing portion 330 is provided on the atmospheric pressure side of the diaphragm 200, and is formed in an L shape from a terminal block 331 for fixing the terminal 132 and a terminal receiving portion 331c (described later) provided on the terminal block 331 to the contact member receiving portion 331a. A terminal 132 that is an extended metal part, a contact spring 133 that is attached to a contact member attachment portion 132a of the L-shaped terminal 132 and is made of a U-shaped conductive material, and a contact point of the U-shaped conductive material And a movable contact 334 attached to the end of the spring 133 on the diaphragm 200 side.

  The terminal block 331 is made of, for example, resin or the like in order to ensure insulation of the terminal 132. The terminal block 331 is a substantially cylindrical recess near the center on the diaphragm 200 side, and includes a contact member accommodating portion 331a for accommodating a contact member of the contact spring 133 and the movable contact 334, and a accommodating portion for the joint 111. It is a recess provided near the middle of the columnar shape that contacts 111d, a groove portion 331b in which the atmospheric pressure side O-ring 113 is disposed, and further to the atmospheric pressure side from the columnar shape accommodated in the accommodating portion 111d of the joint 111, A thin and substantially cylindrical shape is formed therein with a terminal accommodating portion 331c that accommodates a signal transmission portion 132b of a terminal 132 described later.

  In the pressure switch 300 according to the first embodiment, the diaphragm 200 is used instead of the diaphragm assembly 120 as compared with the prior art. Therefore, the terminal block 331 and the contact member accommodating portion 331a are the conventional terminal block. The height is higher than 131 and the contact member accommodating portion 131a. The shape of the movable contact 334 is also adjusted according to the displacement of the diaphragm 200.

  In the pressure switch 300 of the first embodiment, since the diaphragm 200 having a disc spring function is used, the elastic force of the spring in the horizontal direction by the gear-shaped disc spring portion provided with the plate spring 200b causes the plurality of leaf springs 200b to move. The tip is always brought into contact with the accommodating portion 111d of the conductive joint 111 by the elastic force of the spring to form a reliable body ground path. In addition, the vertical fixing is strong because it is sandwiched between the accommodating portion 111d of the joint 111 and the terminal block 131 and is fixed by caulking by the caulking portion 111e of the joint 111.

  As described above, according to the pressure switch according to the first embodiment of the present invention, by using the diaphragm having the disc spring function, the conventional diaphragm, stopper, cap, and disc spring can be divided into four parts. It can be simplified to one part of the diaphragm, and the cost can be suppressed.

  Next, a second embodiment of the present invention using the diaphragm 200 having the disc spring function shown in FIG. 2 will be described.

FIG. 4 is a cross-sectional view showing the structure of a pressure switch 400 according to the second embodiment of the present invention.
In FIG. 4, the pressure switch 400 mainly uses a diaphragm assembly 420 further having a stopper 422 instead of the diaphragm 200 as compared with the pressure switch 300 according to the first embodiment of the present invention shown in FIG. 3. It is characterized by doing. The same components as those of the pressure switch 300 of the first embodiment shown in FIG.

  The pressure switch 400 includes a working medium supply assembly 110 including a conductive joint 111 having a pipe line 111a that supplies the pressure of the working medium, and a diaphragm 200 that is displaced according to the pressure of the working medium and has a disc spring function. A diaphragm assembly 420 and an electrode fixing portion 430 for fixing a terminal 132 for sending an ON / OFF signal of an electrical switch in accordance with the displacement of the diaphragm 200 are provided.

  The diaphragm assembly 420 includes a diaphragm 200 that is displaced according to a change in pressure of the working medium supplied from the pipe 111a and has a disc spring function, and a stopper 422 that is disposed on the atmospheric pressure side of the diaphragm 200.

  The stopper 422 is provided to increase the pressure resistance so as to limit the stroke of the diaphragm 200 and suppress the deformation of the diaphragm 200 due to excessive pressure and the change in pressure characteristics. In addition, an opening for moving the movable contact 434 up and down is provided at the center of the stopper 422. The stopper 422 is formed of, for example, a metal material by press molding, cutting, die casting, forging, or the like. The stopper 422 may be integrated with the diaphragm 200 by laser welding or the like, or may not be integrated.

  In the pressure switch 400 of the second embodiment, since the stopper 422 is provided on the atmospheric pressure side of the diaphragm 200 as the diaphragm assembly 420, it is possible to suppress the deformation of the diaphragm 200 due to excessive pressure and the change in pressure characteristics. As compared with the pressure switch 300 of the first embodiment, the pressure resistance can be increased.

  The electrode fixing portion 430 is provided on the atmospheric pressure side of the diaphragm assembly 420 and extends in an L shape from the terminal block 431 for fixing the terminal 132 and the terminal receiving portion 431c provided on the terminal block 431 to the contact member receiving portion 431a. A terminal 132 that is an existing metal part; a contact spring 133 that is attached to a contact member attaching portion 132a of the L-shaped terminal 132 and is made of a U-shaped conductive material; and a contact spring made of a U-shaped conductive material 133 and a movable contact 434 attached to the end of the diaphragm assembly 420 side of 133.

  The pressure switch 400 according to the second embodiment uses a diaphragm assembly 420 having a stopper 422 instead of the diaphragm 200 as compared with the pressure switch 300 according to the first embodiment shown in FIG. The base 431 and the contact member accommodating portion 431a are formed in a shape different from the terminal base 331 and the contact member accommodating portion 331a of the pressure switch 300 of the first embodiment. The shape of the movable contact 434 is also adjusted according to the displacement of the diaphragm 200. The other configuration of the electrode fixing portion 430 is the same as the configuration of the electrode fixing portion 330 of the pressure switch 300 of the first embodiment.

  As described above, according to the pressure switch according to the second embodiment of the present invention, by using a diaphragm having a disc spring function, the conventional diaphragm, stopper, cap, and disc spring can be divided into four parts. It can be simplified to two parts, a diaphragm and a stopper, and the cost can be reduced.

  As described above, in the first embodiment and the second embodiment, only the diaphragm having the disc spring function or the configuration further provided with the stopper has been described. Since it is not necessary to use a spring, the effects of the present invention can be obtained that parts can be simplified and costs can be reduced.

  As described above, according to the pressure switch according to the present invention, by using a diaphragm having a disc spring function, the conventional diaphragm, stopper, cap, and disc spring can be reduced to a smaller number of parts. And cost can be reduced.

100, 300, 400 Pressure switch 110 Working medium supply assembly 111 Joint 112 Operating pressure side O-ring 113 Atmospheric pressure side O-ring 120, 420 Diaphragm assembly 121, 200 Diaphragm 122, 422 Stopper 123 Cap 130, 330, 430 Electrode fixing part 131, 331, 431 Terminal block 132 Terminal 133 Contact spring 134, 334, 434 Movable contact 125 Belleville spring 201a Belleville spring part 201b Pressure responsive part

Claims (5)

An electrically conductive working medium supply assembly having a conduit for supplying working medium pressure;
A diaphragm that is displaced in accordance with the pressure of the working medium and is electrically conductive and body-grounded through the working medium supply assembly;
A terminal provided on the atmospheric pressure side of the diaphragm, and a contact member attaching portion to which a contact member that contacts the diaphragm when the diaphragm is displaced to the atmospheric pressure side is attached to one end; When the diaphragm and the contact member come into contact with the other end opposite to the end, an ON / OFF signal is sent to an external circuit via the working medium supply assembly, the diaphragm, the contact member, and the terminal. A terminal provided with the signal sending section to send;
An insulating terminal block provided on the atmospheric pressure side of the diaphragm and fixing the terminal;
The diaphragm is formed with a bowl-shaped pressure responsive portion that is displaced according to the pressure of the working medium at a central portion, and a disc spring portion having a leaf spring on the outer peripheral portion, and the tip of the leaf spring of the disc spring portion The pressure switch is spring-contacted with the inner periphery of the conductive working medium supply assembly.   The disc spring portion is formed in a gear shape having a plurality of leaf springs on an outer peripheral portion, and the plurality of leaf springs are bent in an atmospheric pressure direction to generate an elastic force of a horizontal spring. Item 2. The pressure switch according to Item 1.   The contact member is connected to a contact spring made of a conductive material attached to the contact member attachment portion of the terminal, and an end of the contact spring opposite to an end connected to the terminal, and the diaphragm The pressure switch according to claim 1, further comprising a movable contact that contacts the diaphragm when the is displaced to the atmospheric pressure side.   4. The pressure switch according to claim 1, wherein the working medium supply assembly has a pipe line and is a joint for caulking and fixing the diaphragm and the terminal block. 5.   The pressure switch according to any one of claims 1 to 4, wherein a stopper is provided on the atmospheric pressure side of the diaphragm to limit the displacement of the diaphragm and enhance pressure resistance.