JP2019091613A - Switch and pressure switch - Google Patents

Abstract

To provide a switch and a pressure switch which can prevent chattering at a contact, thereby preventing deterioration and so forth of the contact caused by arc discharge which occurs at the time of chattering.SOLUTION: A pressure switch 100 comprises: a contact shaft 123 which is arranged to be movable in the vertical direction with respect to the displacement of a diaphragm 112; and two contact plates 127. The contact shaft 123 includes: a columnar insulator part 124 which comes into contact with the diaphragm 112 in a manner capable of moving in the vertical direction; and a conductor part 125 which is arranged on a side, of the insulator part 124, opposite to the diaphragm 112. The two contact plates 127 each have: one end connected to one of two connection terminals 128; and the other end coming into slidable contact with the contact shaft 123.SELECTED DRAWING: Figure 1

Description

  The present invention relates to switches and contact pressure switches used in the field of refrigeration and air conditioning.

  Pressure switches for safety used in the field of refrigeration and air conditioning are conventionally known. Such pressure switches may sense the pressure in the refrigeration air conditioning cycle and turn off the switch (high pressure cut) when the pressure exceeds a certain pressure or switch off (low pressure cut) when the pressure is less than a certain pressure it can. For this reason, the pressure switch serves as a control function for keeping the pressure in the refrigeration air conditioning cycle within a set range, and a protection function for stopping the system when the pressure in the refrigeration air conditioning cycle becomes abnormal.

  Switches are conventionally known to generate chattering (also called bouncing) due to an impact when the contacts are in contact with each other. Chattering is a vibration phenomenon generally derived from an elastic collision and a cantilever structure of a movable contact in a switch such as a relay, which causes electrical disconnection of the contact switch and causes a malfunction of an electronic circuit. There is. In addition, since a voltage is applied between the contacts, if chattering occurs, an arc is generated at every chattering, and the contacts may be deteriorated, consumed, or heated, and further, welding may be performed. There is also a possibility of

JP, 2014-38721, A Unexamined-Japanese-Patent No. 2006-164654

  As an invention having a common problem of suppressing chattering, for example, in Patent Document 1, an opposing contact switch for opening and closing an electric circuit is provided with an elastic contact portion such as a coil spring or a leaf spring to form a bypass circuit. Thus, an invention has been described that electrically prevents chattering that occurs when contacts make contact while minimizing cost increase.

  Further, Patent Document 2 discloses a switch for consuming kinetic energy at the time of contact closing at a position where a member having a natural frequency affecting chattering is not interposed between the power switch and the switch device. An invention is described in which chattering can be properly suppressed by arranging the original members of the device.

  However, the invention described in any of Patent Literatures 1 and 2 is also an invention that suppresses vibration due to chattering by using an elastic member, and is not an invention that eliminates chattering itself.

  Therefore, an object of the present invention is to provide a switch and a pressure switch that can prevent chattering between contacts and prevent deterioration of the contacts due to arc discharge at the time of chattering.

  In order to solve the above-mentioned subject, the switch of the present invention includes: a drive part movable according to a switch operation; an insulator part; and a conductor part disposed adjacent to the insulator part without steps. Contact point, a second contact point sliding linearly between the insulator portion of the first contact point and the conductor portion, and a drive of the first contact point or the second contact point by the drive portion, The conductor portion of the first contact and the second contact may be in contact / non-contact, thereby providing a connection terminal for transmitting an ON / OFF signal of a switch to the outside.

  In addition, the switch may be a pressure switch, and the drive unit may further include a diaphragm that changes in accordance with the operating pressure of the fluid supplied from the pipe.

  Further, in order to solve the above problems, a pressure switch according to the present invention includes a diaphragm that varies in accordance with an operating pressure of fluid supplied from a pipe, a connection terminal that sends an ON / OFF signal of the switch to the outside, In a pressure switch comprising a contact shaft disposed movably in the vertical direction with respect to the fluctuation of the diaphragm, and a contact switch, the contact shaft is an insulator portion vertically movably contacting the diaphragm; A conductor portion disposed on the side of the insulator portion facing the diaphragm and disposed adjacent to the insulator portion without a step, and one end portion of the contact plate of the contact plate is connected to the connection The other end of the contact plate is connected to a terminal, and the other end of the contact plate is linearly slidably contacted between the insulator portion and the conductor portion of the contact shaft. That.

  In addition, the insulator portion may be formed in a cylindrical shape or a polygonal prism shape.

  Further, the conductor portion may have a connection portion connected to the insulator portion, and the connection portion of the conductor portion may be formed to have a circular or polygonal cross section.

  Further, a bent contact portion may be formed at the other end of the contact plate so as to allow surface contact with the flange portion of the conductor portion of the contact shaft.

  In addition, a slit may be formed in the bent contact portion of the contact plate, and a multipoint contact portion may be formed.

  Further, a contact member formed of a material different from that of the contact plate may be attached to the other end of the contact plate.

  Further, a groove may be formed in the contact member, and a multipoint contact portion may be formed.

  Further, on the side of the contact shaft opposite to the diaphragm, an elastic member may be further provided to bias the contact shaft toward the diaphragm.

  Furthermore, in order to solve the above problems, the pressure switch according to the present invention includes a diaphragm that changes in accordance with the operating pressure of the fluid supplied from the pipe, a connection terminal that sends an ON / OFF signal of the switch to the outside, In a pressure switch provided with one contact and a second contact having an elastic metal member in which a bent portion is formed at a central position in the longitudinal direction, the first contact does not have a step in the insulator portion and the insulator portion. The elastic metal member includes a conductor portion disposed adjacent to and connected to the connection terminal, and one end of the elastic metal member is supported in a cantilever shape, and the other end of the elastic metal member is supported. When the bent portion is pressed in accordance with the fluctuation of the diaphragm, it is linearly slid between the insulator portion and the conductor portion of the first contact.

  In addition, a movable shaft may be disposed so as to be movable in the vertical direction with respect to the fluctuation of the diaphragm, and be in pressure contact with the bent portion of the elastic metal member.

  Further, a contact member formed of a material different from that of the elastic metal member may be attached to the other end of the elastic metal member.

  Also, the diaphragm may perform snap action.

  According to the switch and the pressure switch of the present invention, chattering between contacts can be prevented, and deterioration of contacts due to arc discharge at the time of chattering can be prevented.

FIG. 1 (a) is a longitudinal cross-sectional view showing the switch closed state of the pressure switch according to the first embodiment of the present invention, and FIG. 1 (b) shows the contact state between the conductor portion of the contact shaft and the contact plate It is a top sectional view showing. Fig.2 (a) is a longitudinal cross-sectional view which shows the switch open state of the pressure switch shown to Fig.1 (a), and FIG.2 (b) shows the contact state of the insulator part and contact plate of a contact shaft. It is top sectional drawing. It is a perspective view which shows the contact state of a contact shaft and a contact plate. FIG. 4 (a) is a longitudinal cross-sectional view showing the switch closed state of the pressure switch according to the second embodiment of the present invention, and FIG. 4 (b) shows the contact state between the conductor portion of the contact shaft and the contact plate FIG. 4C is a perspective view showing a contact state between a contact shaft and a contact plate connected to a connection terminal. Fig.5 (a) is a longitudinal cross-sectional view which shows the switch open state of the pressure switch shown to Fig.4 (a), FIG.5 (b) shows the contact state of the insulator part and contact plate of a contact shaft. It is top sectional drawing. FIG. 6 (a) is a longitudinal cross-sectional view showing the switch closed state of the pressure switch according to the third embodiment of the present invention, and FIG. 6 (b) shows the contact state between the conductor portion of the contact shaft and the contact plate It is a top sectional view showing, and Drawing 6 (c) is a perspective view of a conductor part of a contact shaft. Fig.7 (a) is a longitudinal cross-sectional view which shows the switch open state of the pressure switch shown to Fig.6 (a), FIG.7 (b) shows the contact state of the insulator part and contact plate of a contact shaft. It is top sectional drawing. FIG. 8 (a) is a perspective view showing a contact state between a contact shaft and a contact plate connected to a connection terminal, and FIG. 8 (b) is a contact plate having an insulator portion of the contact shaft and a multipoint contact. FIG. 6 is an enlarged top cross-sectional view showing a state of contact with the above. FIG. 9 (a) is a longitudinal cross-sectional view showing the switch closed state of the pressure switch according to the fourth embodiment of the present invention, and FIG. 9 (b) shows the contact state between the conductor portion of the contact shaft and the contact plate It is a top sectional view showing. Fig.10 (a) is a longitudinal cross-sectional view which shows the switch open state of the pressure switch shown to Fig.9 (a), FIG.10 (b) shows the contact state of the insulator part and contact plate of a contact shaft. It is top sectional drawing. It is a perspective view which shows the contact state of the contact shaft and the contact plate connected to the connecting terminal. Fig.12 (a) is a longitudinal cross-sectional view which shows the switch closing state of the pressure switch by the 5th Embodiment of this invention, FIG.12 (b) is a switch opening state of the pressure switch shown to Fig.12 (a). It is a longitudinal cross-sectional view which shows. FIG. 13 (a) is a longitudinal cross-sectional view showing the switch open state of the pressure switch according to the sixth embodiment of the present invention, and FIG. 13 (b) is the switch closed state of the pressure switch shown in FIG. 13 (a) It is a longitudinal cross-sectional view which shows. FIG. 14 (a) is a perspective view showing a contact state between a contact shaft of a pressure switch according to a seventh embodiment of the present invention and a contact plate connected to a connection terminal, and FIG. 14 (b) is a perspective view 14 (c) is a schematic view showing a second contact state, and FIG. 14 (d) is a schematic view showing a third contact state.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The concept of the vertical direction or the horizontal direction in the following description corresponds to the vertical and horizontal directions in FIG. It does not indicate a relationship.

  First, a first embodiment of the present invention will be described.

  FIG. 1A is a longitudinal sectional view showing the switch closed state of the pressure switch 100 according to the first embodiment of the present invention, and FIG. 1B shows the conductor portion 125 of the contact shaft 123 and the contact plate 127 2 (a) is a longitudinal cross-sectional view showing the switch open state of the pressure switch 100 shown in FIG. 1 (a), and FIG. 2 (b) is a contact shaft 123. 18 is a top sectional view showing a state of contact between the insulator portion 124 and the contact plate 127 of FIG. FIG. 3 is a perspective view showing a contact state of the contact shaft 123 and the contact plate 127. As shown in FIG.

  In FIGS. 1A to 3, the pressure switch 100 according to the first embodiment of the present invention includes a pressure introducing unit 110, a switch unit 120, and a cover member 130. The pressure introducing unit 110 and the switch The parts 120 are fixed to one another by means of a cylindrical cover member 130, for example, made of metal, which is disposed on the outer periphery of these parts.

  As shown in FIGS. 1A and 2A, the pressure introducing unit 110 includes a joint 111, a diaphragm 112, a stopper 113, a cap 114, and a welding portion 115.

  The joint 111 is connected to a pipe through which a fluid such as a refrigerant used in the refrigeration air conditioning cycle is to be detected and which is to be detected, and made of, for example, a metal material, and is formed by press forming, cutting, die casting, forging or the like. The end of the joint 111 is connected to an opening 114 a provided at the center of the cap 114 by welding, for example.

  The diaphragm 112 defines a pressure receiving chamber 112A between the joint 111 and the cap 114. The diaphragm 112 fluctuates according to the operating pressure of the fluid supplied from the piping to the pressure receiving chamber 112A. In the present embodiment, the diaphragm 112 is made of a metal having a reverse action, ie, a snap action, in accordance with the pressure of the pressure receiving chamber 112A. That is, when the pressure of the pressure receiving chamber 112A is less than the set value, the pressure is expanded downward as shown in FIG. 1A, and when the pressure of the pressure receiving chamber 112A becomes equal to or more than the set value, FIG. As shown in a), it reversibly reverses to a shape that bulges upward. In the present embodiment, a snap action is used as the diaphragm 112. However, the present invention is not limited to this, and any shape may be used as long as the shape of the diaphragm 112 changes in accordance with the change in the pressure of the fluid in the pressure receiving chamber 112A.

  The stopper 113 and the cap 114 are members made of, for example, a metal material having openings 113 a and 114 a at the center, and are formed by press forming, cutting, die casting, forging, or the like. The stopper 113 is also referred to as an upper cover, and is disposed on the side of the diaphragm 112 facing the pressure receiving chamber 112A. The cap 114 is also referred to as a lower cover and is disposed on the pressure receiving chamber 112A side of the diaphragm 112. In the present embodiment, the stopper 113 and the cap 114 are fixed by the welding portion 115 around the entire outer periphery in a state where the diaphragm 112 is held therebetween.

  The stopper 113 and the cap 114 are not limited to the above-described example. For example, the outer peripheral edge of the diaphragm 112 may be supported by one support member in which the stopper 113 and the cap 114 are integrated. Also, for example, the stopper 113 and the cap 114 as a support member for supporting the outer peripheral edge of the diaphragm 112 may be configured as a part of the joint 111 or a part of another device (for example, a base). Alternatively, the cap 114 and the diaphragm 112 or only the stopper 113 and the diaphragm 112 may be used. In the present embodiment, the central opening 114a of the cap 114 is curved toward the joint 111, and the cap 114 forms the pressure receiving chamber 112A together with the joint 111. However, the present invention is not limited to this shape. Another bowl-shaped component may be fixed to the cap 114, or the shape of the joint 111 may be modified to form the pressure receiving chamber 112A.

  As shown in FIGS. 1A to 3, the switch unit 120 is connected to a terminal block 121, a guide plate 122, a contact shaft 123, a plate spring 126, two contact plates 127, and two connections. A terminal 128 and a sealing O-ring 129 are provided.

  The terminal block 121 is formed of an approximately insulating, electrically insulating synthetic resin or the like. At the top of the terminal block 121, one end of each of the two connection terminals 128 is held in a state of being drawn out. Further, an adhesive 129A is applied around the two connection terminals 128 on the surface of the terminal block 121, and performs a waterproof / dustproof function to the air side. As shown in FIG. 1A and FIG. 2A, inside the terminal block 121, conductive parts such as the contact shaft 123 and the contact plate 127 are accommodated inside, and the terminal block 121 is made of an adhesive 129A, And, together with a sealing O-ring 129 described later, the pressure switch 100 has a waterproof function.

  As shown in FIG. 1A and FIG. 2A, the guide plate 122 is made of synthetic resin or the like having electrical insulation, has a through hole 122a at the center, and is opposed to the pressure receiving chamber 112A. It is formed in a shape having a thick portion 122b that gradually protrudes toward the center. The guide plate 122 is disposed on the side opposite to the pressure receiving chamber 112A of the stopper 113, whereby the metal parts such as the diaphragm 112, the stopper 113 and the cap 114 and the conductive parts such as the contact shaft 123 and the contact plate 127 are It plays the function of keeping the insulation between.

  As shown in FIGS. 1A and 2A, the contact shaft 123 is movably disposed in the opening 113a of the stopper 113 and the through hole 122a of the guide plate 122, and the snap action of the diaphragm 112, etc. And the biasing force of a plate spring 126, which will be described later, move in the vertical direction with respect to the diaphragm 112. As shown in FIG. 3, the contact shaft 123 is disposed on the side of the cylindrical insulator portion 124 that is in movable contact with the diaphragm 112 in the vertical direction, and the insulator portion 124 on the side facing the diaphragm 112. A cross section connected to 124 has a square-shaped connecting portion 125a, and a conductor portion 125 having a T-shaped cross section that is symmetrical with respect to the connecting portion 125a.

  In the present embodiment, as shown in FIG. 3, the conductor portion 125 has a T shape in which a rectangular parallelepiped is disposed on the side facing the insulator portion 124 of the connection portion 125a. There is no limitation, and a disk-shaped flange may be provided instead of the rectangular parallelepiped. Further, in the present embodiment, as shown in FIG. 1B, the cross section of the connection portion 125a of the T-shaped conductor portion 125 is made into a square shape, and as shown in FIG. Although the cylindrical shape is used, the present invention is not limited to this, and both the conductor portion 125 and the insulator portion 124 may have a circular cross section or a polygonal shape such as a square, or may have another shape. However, since the surfaces of the insulator portion 124 and the conductor portion 125 need to contact the two contact plates 127 slidably as described later, the contact plate of the insulator portion 124 and the conductor portion 125 The sliding portion with 127 needs to be disposed adjacent to each other without any step. In addition, as a method of connecting the insulator portion 124 of the contact shaft 123 and the conductor portion 125, methods such as insert molding, press fitting, welding, screwing, etc. can be considered, but if there is no change in relative position, they are in contact It does not matter even if it is fitting etc.

  The leaf spring 126 is disposed on the upper portion of the conductor portion 125 of the contact shaft 123 as shown in FIGS. 1A and 2A, contacts the upper surface of the inner wall of the terminal block 121, and lowers the contact shaft 123. It generates a force to In the present embodiment, the leaf spring 126 is, for example, a metal leaf spring having elasticity, but the present invention is not limited to this and may use springs of other shapes that generate a biasing force downward. I do not care. Further, in the plate spring 126, when the pressure in the pressure receiving chamber 112A decreases and the diaphragm 112 expands downward, the contact shaft 123 and the contact plate 127 contact each other in a slidable manner, thereby reliably contacting the contact shaft 123 It is provided to move downward. Therefore, when the contact force between the contact shaft 123 and the contact plate 127 is set low, or when the contact shaft 123 is fixed to the diaphragm 112, the plate spring 126 may not be provided.

  The contact plate 127 is, as shown in FIG. 1A and FIG. 2A, two rectangular metal plate springs, and one end of each contact plate is used as two connection terminals 128. Connected and fixed. Furthermore, the other end of each of the two contact plates 127 slidably contacts the contact shaft 123 disposed therebetween, and faces the pressure receiving chamber 112A so that the contact shaft 123 can move in this state. It is arranged in the shape of a cantilever in the state where it is inclined toward the center on the

  Further, in the present embodiment, as shown in FIGS. 1A and 2A, the T-shaped conductor portion 125 of the contact shaft 123 is provided at the other end of each of the two contact plates 127. The contact portions 127a are formed to be able to make surface contact with the flange portion. As a result, when the contact shaft 123 moves downward, the two contact plates 127 and the conductor portion 125 of the contact shaft 123 can be reliably in contact, and the electrical conduction in the switch closed state can be ensured. it can.

  The two connection terminals 128 are external output terminals of the pressure switch 100 and, as described above, the contact shaft 123 of the contact shaft 123 adjusted to the fluctuation of the diaphragm 112 according to the working pressure of the fluid supplied from the piping to the pressure receiving chamber 112A. The switch operation performed by the movement is sent to the outside as an open / close signal of the electric switch.

  As shown in FIGS. 1A and 2A, the sealing O-ring 129 is disposed between the guide plate 122 and the terminal block 121 above the stopper 113, and is waterproof to the atmosphere side. / Plays a dustproof function. The contact shaft 123 constitutes a first contact, and the contact plate 127 constitutes a second contact.

  As described above, according to the pressure switch 100 according to the first embodiment of the present invention, the contact shaft 123 having the insulator portion 124 and the conductor portion 125 disposed adjacent to the step without any step is a variation of the diaphragm 112 The two contact plates 127 slide and contact linearly with the contact shaft 123 while performing switch opening / closing operation with the conductor portion 125 at this time, thereby making a pressure switch with contacts. Can prevent chattering that is a problem and eliminate problems due to this.

  Next, a second embodiment of the present invention will be described.

  FIG. 4 (a) is a longitudinal cross-sectional view showing the switch closed state of the pressure switch 200 according to the second embodiment of the present invention, and FIG. 4 (b) shows the conductor portion 125 of the contact shaft 123 and the contact plate 227A. 4 (c) is a perspective view showing the contact state between the contact shaft 123 and the contact plate 227A connected to the connection terminal 128, and FIG. 5 (a) is FIG. 5B is a top cross-sectional view showing the contact state between the insulator portion 124 of the contact shaft 123 and the contact plate 227A. FIG. 5B is a vertical cross-sectional view showing the switch open state of the pressure switch 200 shown in FIG. It is.

  4 (a) -5 (b), the pressure switch 200 according to the second embodiment of the present invention has two contact plates compared to the pressure switch 100 shown in FIGS. 1 (a) -3. The other configuration is the same as that of the pressure switch 100 except that a contact member 227B formed of a material different from that of the two contact plates 227A is attached to the other end of the 227A. The same components are denoted by the same reference symbols and the description thereof is omitted.

  By providing the contact member 227B at the other end of the contact plate 227A, a heat-resistant material can be selected as the material of the contact member 227B. As a material of the contact member 227B, for example, a silver alloy or the like used in the contact member of the pressure switch of the cooling system may be used.

  As described above, according to the pressure switch 200 of the second embodiment of the present invention, the same effect as that of the first embodiment can be obtained, and the contact member 227B formed of a heat-resistant material is used. Thus, the durability of the pressure switch 200 can be improved.

  Next, a third embodiment of the present invention will be described.

  FIG. 6 (a) is a longitudinal cross-sectional view showing the switch closed state of the pressure switch 300 according to the third embodiment of the present invention, and FIG. 6 (b) shows the conductor portion 325 of the contact shaft 323 and the contact plate 327. 6 (c) is a perspective view of the conductor portion 325 of the contact shaft 323, and FIG. 7 (a) is a switch of the pressure switch 300 shown in FIG. 6 (a). FIG. 7B is a top cross-sectional view showing a contact state between the insulator portion 324 of the contact shaft 323 and the contact plate 327. FIG. 8A is a contact shaft FIG. 8B is a perspective view showing a contact state between H.323 and the contact plate 327 connected to the connection terminal 128. FIG. 8B is a contact plate 327 having an insulator portion 324 of the contact shaft 323 and a multipoint contact portion 327b. Top cross section showing the contact state of It is.

  6 (a) to 8 (b), the pressure switch 300 according to the third embodiment of the present invention is different from the pressure switch 100 shown in FIG. 1 (a) to FIG. The difference is that the cross section of the connection portion 325a of the V-shaped conductor portion 325 is circular and that the slit 327a is formed at the other end of the two contact plates 327 and the multipoint contact portion 327b is formed. The other configurations are the same as the pressure switch 100. The same components are denoted by the same reference symbols and the description thereof is omitted.

  As shown in FIG. 8A, in the present embodiment, contact portions bent in the same manner as the two contact plates 127 of the first embodiment are formed on the two contact plates 327, and this contact portion is further formed. A slit 327a is formed in the bent contact portion, and a multipoint contact portion 327b in which the contact portion is divided into two is formed. By providing the multipoint contact portion 327b, the possibility of contact failure due to biting is reduced, and the reliability is improved.

  In the present invention, in order to prevent chattering, it is necessary for the two contact plates 327 to slide and perform the switch opening / closing operation with the conductor portion 325. Therefore, the insulator portion 324 and the conductor portion 325 of the contact shaft 323 Should be arranged adjacent to each other without any step. At this time, as in the pressure switch 100 of the first embodiment, the multipoint contact portion 327b is provided, and the cross section of the connection portion 125a of the conductor portion 125 is made square and the insulator portion 124 is made cylindrical. You need to change the diameter of the cylinder. This point will be described using FIG. 8 (b).

  As shown in FIG. 8B, when slits 327a are provided in the two contact plates 327 and the multipoint contact portion 327b is formed, the conductor portion 125 has a cylindrical shape from the connecting portion 125a having a square cross section. When moving to contact with the insulator portion 124, the contact position is inward and a step is generated, which may cause the chattering of the contact plate 327. In order to prevent this, it is necessary to increase the radius of the cylindrical insulator portion 324 as shown by the solid line in FIG. 8B. The conditions of the radius of the cylindrical shape at this time are as follows. The following equation is for the case where the cross section of the connection portion 125 a of the conductor portion 125 is a square shape, and in the case of any other shape, a separate equation is required. In addition, when the slit width is narrow, the step itself becomes small, so there is no need to change the radius.

Ａ：接続部１２５ａの幅、Ｂ：スリット３２７ａの幅、Ｃ：絶縁体部３２４の半径

A: Width of connection portion 125a, B: Width of slit 327a, C: Radius of insulator portion 324

  As described above, when the multipoint contact portion 327b is provided, the insulator portion 324 needs to be changed to a radius in consideration of the width of the slit 327a, so the shapes of the insulator portion 324 and the conductor portion 325 are , Cylinders, or polygonal columns such as square columns are preferable. In the present embodiment, as shown in FIG. 6B, the cross section of the connection portion 325a of the T-shaped conductor portion 325 is circular, and as shown in FIG. 7B, the insulator portion 324 is It has a cylindrical shape.

  As in the pressure switch 200 of the second embodiment, contact members made of a heat-resistant material may be attached to each of the multipoint contact portions 327b of the contact plate 327 of the pressure switch 300 to provide multipoint contact. .

  As described above, according to the pressure switch 300 according to the third embodiment of the present invention, the same effect as that of the first embodiment can be obtained, and further, the two contact plates 327 are provided with the slits 327a. By forming 327 b, the possibility of contact failure due to biting is reduced, and reliability can be improved.

  Next, a fourth embodiment of the present invention will be described.

  FIG. 9 (a) is a longitudinal cross-sectional view showing the switch closed state of the pressure switch 400 according to the fourth embodiment of the present invention, and FIG. 9 (b) is a conductor portion 425 of the contact shaft 423 and the contact plate 427A. 10 (a) is a vertical cross-sectional view showing a switch open state of the pressure switch 400 shown in FIG. 9 (a), and FIG. 10 (b) is a contact shaft 423. FIG. 11 is a perspective view showing the contact state between the contact shaft 423 and the contact plate 427A connected to the connection terminal 128. As shown in FIG.

  In FIGS. 9 (a) to 11, the pressure switch 400 according to the fourth embodiment of the present invention has two contact plates compared to the pressure switch 200 shown in FIGS. 4 (a) to 5 (b). Grooves 427 Ba are formed in the two contact members 427 B respectively attached to the other end of the 427 A, and a multipoint contact portion 427 Bb is formed, and the insulator portion 424 of the contact shaft 423 is a conductor portion 425. The other configuration is the same as that of the pressure switch 200, except that the square connection portion 425a has a quadrangular prism shape. The same components are denoted by the same reference symbols and the description thereof is omitted.

  By providing the contact member 427B, a heat-resistant material can be used as the material of the contact member 427B, whereby the durability of the pressure switch 400 can be improved. Further, by providing the groove 427Ba in the contact member 427B and forming the multi-point contact portion 427Bb, the possibility of the contact failure due to the biting becomes low, and the reliability can be improved.

  As described above, also by the pressure switch 400 according to the fourth embodiment of the present invention, the same effect as the first embodiment can be obtained, and furthermore, the same effect as the second and third embodiments can be obtained. Can.

  Next, a fifth embodiment of the present invention will be described.

  Fig.12 (a) is a longitudinal cross-sectional view which shows the switch closing state of the pressure switch 500 by the 5th Embodiment of this invention, FIG.12 (b) is a switch of the pressure switch 500 shown to Fig.12 (a). It is a longitudinal cross-sectional view which shows an open state.

  12A and 12B, a pressure switch 500 according to a fifth embodiment of the present invention includes a pressure introducing unit 110, a switch unit 520, and a cover member 130. The pressure introducing portion 110 and the switch portion 520 are fixed to each other by a cylindrical cover member 130 made of, for example, a metal, which is disposed on an outer peripheral portion of the pressure introducing portion 110 and the switch portion 520. The pressure introducing portion 110 and the cover member 130 have the same configuration as the pressure switch 100, and thus the description thereof is omitted.

  As shown in FIGS. 12 (a) and 12 (b), the switch unit 520 includes a terminal block 521, a guide plate 522, a movable shaft 523, an elastic metal plate 526, a contact member 527, and two switches. A connection terminal 528 and a sealing O-ring 529 are provided.

  The terminal block 521 is formed of an electrically insulating synthetic resin or the like, and is disposed on the stopper 113. The terminal block 521, together with the guide plate 522 and the sealing O-ring 529, has a waterproof / dustproof function against the atmosphere. At the top of the terminal block 521, one end of each of the two connection terminals 528 is held in a state of being drawn out. One of the two connection terminals 528 extends to the center along the upper surface wall inside the terminal block 521 and is disposed adjacent to the upper surface wall of the terminal block 521 without any step.

  The upper surface wall inside the terminal block 521 constitutes an insulator portion of the first contact, and one of the two connection terminals 528 constitutes a conductor portion of the first contact. Further, in the present embodiment, the length of one of the two connection terminals 528 is extended, but another conductive component may be newly connected.

  As shown in FIGS. 12 (a) and 12 (b), the guide plate 522 is formed of synthetic resin or the like having electrical insulation, and has an opening 522a at the center and on the side facing the pressure receiving chamber 112A. It is formed in the shape which has a flat plane.

  As shown in FIGS. 12A and 12B, the movable shaft 523 is movably disposed in the opening 113a of the stopper 113 and the opening 522a of the guide plate 522, and the snap action of the diaphragm 112, etc. It is disposed to be movable in the vertical direction with respect to the fluctuation of the pressure sensor, and is pressably in contact with a bent portion 526a of an elastic metal plate 526 described later.

  The elastic metal plate 526 is a metal plate having a rectangular shape in which a bending portion 526a is formed at a central position in the longitudinal direction, and constitutes a second contact. One end of the elastic metal plate 526 is connected to the other of the two connection terminals 528 and supported in a cantilever manner. Further, the other end of the elastic metal plate 526 is pressed by the bent portion 526a in accordance with the fluctuation of the diaphragm 112, whereby the upper surface wall inside the terminal block 521 constituting the insulator portion of the first contact described above And a part of the connection terminal 528 which constitutes the conductor portion of the first contact point. Here, although a metal plate having a rectangular shape is used as the elastic metal plate 526, another elastic metal member such as a wire may be used.

  The contact member 527 is attached to the other end of the elastic metal plate 526, and is formed of a material different from that of the elastic metal plate 526. As a material of the contact member 527, a heat-resistant material, for example, a silver alloy or the like used in the contact member of a pressure switch of a cold heat system may be used. Further, as in the fourth embodiment, a groove may be formed in the contact member 527 to form a multipoint contact portion.

  As described above, also by the pressure switch 500 according to the fifth embodiment of the present invention, the same effects as in the first to fourth embodiments can be obtained, and further, compared with the first to fourth embodiments. The advantage is that the overall length can be shortened, leading to miniaturization.

  Although the embodiments having two connection terminals have been described above with reference to the pressure switches 100 to 500 according to the first to fifth embodiments of the present invention, the present invention is not limited thereto. It may be one or more than one. Hereinafter, an embodiment having two connection terminals will be described.

  Next, a sixth embodiment of the present invention will be described.

  FIG. 13 (a) is a longitudinal cross-sectional view showing a switch open state of a pressure switch 600 according to a sixth embodiment of the present invention, and FIG. 13 (b) is a switch of the pressure switch 600 shown in FIG. 13 (a). It is a longitudinal cross-sectional view which shows a closed state.

  13 (a) and 13 (b), one pressure switch 600 according to the sixth embodiment of the present invention is compared with the pressure switch 500 shown in FIGS. 12 (a) and 12 (b). The other configuration is the same as that of the pressure switch 500, except that it is a body earth type having a connection terminal 628 of The same components are denoted by the same reference symbols and the description thereof is omitted.

  As shown in FIG. 13B, in the switch closed state of the body earth type pressure switch 600, the conduction path is the connection terminal 628, the contact member 627, the elastic metal plate 626, the guide plate 622, a metal diaphragm assembly, It becomes an external ground such as the joint 111. For this reason, in the present embodiment, the guide plate 622 needs to be formed of a conductive material such as metal. The diaphragm assembly of the present embodiment is composed of a diaphragm 112, a stopper 113, a cap 114, and a welding portion 115. In addition, since it is necessary to ensure electrical continuity between the guide plate 622 and the metal diaphragm assembly or an external ground such as the joint 111, the space between the guide plate 622 and the metal diaphragm assembly is A metal disc spring may be arranged.

  As described above, the pressure switch 600 according to the sixth embodiment of the present invention can also achieve the same effect as that of the fifth embodiment.

  Next, a seventh embodiment of the present invention will be described.

  FIG. 14 (a) is a perspective view showing a contact state between the contact shaft 723 of the pressure switch 700 and the contact plate 727 connected to the connection terminal 728 according to the seventh embodiment of the present invention, and FIG. 14 (c) is a schematic view showing a second contact state, and FIG. 14 (d) is a schematic view showing a third contact state. is there.

  14 (a) to 14 (d), the pressure switch 700 according to the seventh embodiment of the present invention has three connection terminals as compared with the pressure switch 100 shown in FIGS. 1 (a) to 3). The configuration is the same as that of the pressure switch 100, except that it has 728 and a contact shaft 723 for three contacts. The same components are denoted by the same reference symbols and the description thereof is omitted. Here, the contact shaft 723 for three contacts has a cylindrical shape, and the conductor portion 725A, the insulator portion 724, and the conductor portion 725B are adjacent in the longitudinal direction in the longitudinal direction from the upper side of FIG. The conductor portion 725A and the conductor portion 725B are electrically connected by the connection portion 725C disposed inside the insulator portion 724.

  As shown in FIGS. 14 (b) to 14 (d), when the contact shaft 723 is moved in the vertical direction shown in FIG. 14 (a), the electrical connection state of the three connection terminals 728 changes. Do. That is, in the first contact state shown in FIG. 14 (b), the connection terminals 728L, 728C are electrically connected, and in the second contact state shown in FIG. 14 (c), the connection terminals 728H, 728L are In the third contact state shown in FIG. 14D, the connection terminals 728H and 728C are electrically connected. The state shown in FIG. 14 (a) corresponds to the third contact state shown in FIG. 14 (d).

  Also, for example, in the case of the pressure switch 700 driven by the diaphragm in which the contact shaft 723 snaps, since the stroke of the contact shaft 723 can not be made longer, the first state shown in FIG. Transition is made between the second state shown in FIG. 14 or between the second contact state shown in FIG. 14 (c) and the third contact state shown in FIG. 14 (d). In addition, when the drive unit is other than a diaphragm, it is also possible to make a transition between all of the first to third states. Further, in the present embodiment, the three connection terminals 728H, 728C, and 728L are provided. However, the present invention is not limited to this, and may be provided with more connection terminals.

  As described above, the pressure switch 700 according to the seventh embodiment of the present invention can also achieve the same effect as that of the first embodiment.

  Although the switch and the pressure switch of the present invention have been described using the pressure switches according to the first to seventh embodiments as described above, these embodiments are illustrative and not limitative. For example, although a metal snap action is used as the diaphragm 112, the present invention is not limited to this, and the drive unit for moving the contact shaft or the movable shaft may be another one.

  Further, the present invention is not limited to the pressure switch, and can be applied to other switches such as an electrical switch. That is, the first contact including the insulator portion and the conductor portion disposed adjacent to the insulator portion without a step, and driven by the drive portion, and a straight line between the insulator portion and the conductor portion of the first contact point The present invention is also applicable to other switches such as an electric switch which has a second contact sliding in the shape of a ring, and sends an ON / OFF signal of the switch to the outside by contact / noncontact of the first contact and the second contact. It is possible.

  As described above, according to the switch and the pressure switch of the present invention, it is possible to prevent chattering between the contacts, which is a problem with the contact type switch and the pressure switch, and to solve the problem due to this.

100, 200, 300, 400, 500, 600, 700 Pressure switch 110 Pressure introducing portion 111 Joint 112 Diaphragm 113 Stopper 113a, 114a, 522a Opening 114 Cap 115 Weld 120, 220, 320, 420, 520, 620 Switch 121, 521, 621 Terminal block 122, 522, 622 Guide plate 122a Through hole 122b Thick portion 123, 323, 423, 723 Contact shaft 124, 324, 424, 724 Insulator portion 125, 325, 425, 725A, 725B, 725C Conductor part 125a, 325a, 425a Connection part 126 Leaf spring 127, 227A, 327, 427A, 727 Contact plate 127a Contact part 128, 528, 628, 728 Connection terminal 129, 529 O ring for sealing 129A, 529A Adhesive 130 Cover member 227B, 427B, 527, 627 Contact member 327a Slit 327b, 427Bb Multi-point contact portion 427 Ba Groove 523 Movable shaft 526, 626 Elastic metal plate 526a, 626a Bending portion

Claims (14)

A drive unit movable according to the switch operation;
An insulator portion, and a first contact including a conductor portion disposed adjacent to the insulator portion without any step;
A second contact sliding in a straight line between the insulator portion and the conductor portion of the first contact;
The conductor portion of the first contact and the second contact are brought into contact / non-contact by the drive of the first contact or the second contact by the drive portion, whereby the ON / OFF signal of the switch is externally output. And a connection terminal for transmitting. The switch is a pressure switch, and
The switch according to claim 1, further comprising: a diaphragm that varies in accordance with an operating pressure of fluid supplied from a pipe as the driving unit. A diaphragm that varies in accordance with the operating pressure of the fluid supplied from the pipe;
A connection terminal for sending an ON / OFF signal of the switch to the outside,
A contact shaft which is arranged vertically displaceable with respect to the variation of the diaphragm;
A pressure switch comprising a contact plate
The contact shaft is
An insulator portion vertically movably in contact with the diaphragm;
And a conductor portion disposed on the side of the insulator portion facing the diaphragm and disposed adjacent to the insulator portion without a step.
The contact plate is
One end of the contact plate is connected to the connection terminal,
A pressure switch characterized in that the other end of the contact plate is linearly slidably contacted between the insulator portion and the conductor portion of the contact shaft.   The pressure switch according to claim 3, wherein the insulator portion is formed in a cylindrical shape or a polygonal prism shape. The conductor portion has a connection portion connected to the insulator portion,
The pressure switch according to claim 3, wherein the connection portion of the conductor portion is formed to have a circular or polygonal cross section.   The bent contact portion for enabling surface contact to the flange portion of the conductor portion of the contact shaft is formed at the other end of the contact plate. Pressure switch.   The pressure switch according to claim 6, wherein a slit is formed in the bent contact portion of the contact plate, and a multipoint contact portion is formed.   The pressure switch according to claim 3, wherein a contact member formed of a material different from that of the contact plate is attached to the other end of the contact plate.   The pressure switch according to claim 8, wherein a groove is formed in the contact member and a multipoint contact portion is formed.   The pressure switch according to claim 3, further comprising: an elastic member for biasing the contact shaft toward the diaphragm on a side of the contact shaft facing the diaphragm. A diaphragm that varies in accordance with the operating pressure of the fluid supplied from the pipe;
A connection terminal for sending an ON / OFF signal of the switch to the outside,
The first contact,
And a second contact having an elastic metal member having a bend at a central position in the longitudinal direction.
The first contact includes an insulator portion, and a conductor portion disposed adjacent to the insulator portion without a step and connected to the connection terminal,
In the elastic metal member, one end of the elastic metal member is supported in a cantilever shape, and the other end of the elastic metal member is pressed by the bent portion in accordance with the fluctuation of the diaphragm. A pressure switch characterized by linearly sliding between the insulator portion and the conductor portion of the first contact.   12. The apparatus according to claim 11, further comprising: a movable shaft disposed in movable contact in the vertical direction with respect to the variation of the diaphragm, and pressingly contacting the bent portion of the elastic metal member. Pressure switch.   The pressure switch according to claim 11, wherein a contact member made of a material different from the elastic metal member is attached to the other end of the elastic metal member.   The pressure switch according to any one of claims 3 to 13, wherein the diaphragm performs a snap action.

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