JP2022189309A - pressure switch - Google Patents

Abstract

To provide a pressure switch capable of suppressing breakage of a pressure responsive portion and preventing leakage of pressure medium by preventing an actuation plate from falling off and improving pressure resistance even when excessive pressure is applied to the pressure responsive portion.SOLUTION: A pressure switch 1 includes a shaft 7 provided coaxially with a fulcrum 2a in the vicinity of an actuation plate 4 in a main body 2, and a shift prevention stopper 9 provided at a position closer to the end of a horizontal side portion 4b than the shaft 7 of the actuation plate 4, and even when excessive pressure is applied to a bellows 3, the shift prevention stopper 9 abuts against the shaft 7 to restrict the movement of the actuation plate 4.SELECTED DRAWING: Figure 1

Description

The present invention relates to pressure switches.

Conventionally, a pressure switch has a bellows as a pressure-responsive part in a body, an L-shaped actuation plate that rotates around a fulcrum provided in the body by expansion and contraction of the bellows, and is connected to the vertical side of the actuation plate. It is known to have a spring that opposes the movement of the actuating plate, an actuating shaft that responds to the movement of the actuating plate, and a movable contact plate that controls the microswitch by the movement of the actuating shaft (for example, See Patent Documents 1 and 2).

In such a pressure switch, the operating shaft has one end engaged with the vertical side portion of the operating plate and the other end engaged with the movable contact plate constituting the microswitch. Also, the microswitch has, for example, two fixed contacts and a movable contact arranged between them. In microswitches, the movable contact to the fixed contact is provided at the free end of the movable contact plate. The movable contact plate has a quick reversal mechanism including a deformation spring.

In such a conventional pressure switch, when the pressure applied to the bellows increases or decreases and the operating plate rotates around the fulcrum, the movable contact plate operates via the operating shaft responding to the movement of the operating plate. . This causes the movable contact plate to alternatively connect the movable contact between one or two fixed contacts, reversing the microswitch.

Japanese Utility Model Laid-Open No. 50-9571 Japanese Utility Model Laid-Open No. 61-193647

By the way, in the conventional pressure switches described in Patent Documents 1 and 2, the main body has a pressure increase side stopper and a pressure decrease side stopper (only the latter in Patent Document 1) for restricting the rotational movement of the operating plate. They are provided at predetermined intervals in the vertical direction in the vicinity of the ends of the lateral sides of the actuating plate. When excessive pressure is applied to the bellows, the bellows is prevented from stretching by holding the operating plate with a fulcrum provided on the main body and a pressure-rising stopper provided on the upper side of the main body. ing.

However, in such a conventional pressure switch, when the pressure applied to the bellows becomes higher, the bellows tilts and stretches, which may tilt the operating plate of the main body. As a result, the actuating plate, which is no longer supported by the main body, is pushed up by the lower bellows with the end of the horizontal side tilted downward, so that the end of the horizontal side is pushed up from the pressure lowering side stopper. There was a possibility that it would come off and fall off in the direction of the bottom plate. In this case, the detachment of the actuating plate may not only damage the bellows, but also cause leakage of pressure medium such as refrigerant.

An object of the present invention is to prevent the pressure responsive portion from falling off and to improve pressure resistance even when excessive pressure is applied to the pressure responsive portion. To provide a pressure switch capable of

The pressure switch of the present invention includes a pressure responsive portion within a body, an operating plate that abuts against the pressure responsive portion and rotates about a fulcrum provided on the main body by expansion and contraction of the pressure responsive portion, and the operating plate. A pressure switch comprising: a spring that opposes movement; an operating shaft that responds to the movement of the operating plate; The actuating plate has a first side portion with which the pressure responsive portion abuts, and a second side portion continuous with one end side of the first side portion via a bent portion. A shaft is provided in the vicinity of the first side of the working plate in a direction coaxial with the fulcrum, and the working plate is provided with a deviation prevention stopper located on the other end side of the first side rather than the shaft, When an excessive pressure is applied to the pressure responsive portion, the movement of the actuating plate is restricted by the contact of the shift prevention stopper with the shaft.

According to the present invention as described above, even if excessive pressure is applied to the pressure responsive portion and the actuating plate loses the supporting relationship with the main body due to the breakage of the fulcrum, the end of the first side portion Since it is pushed up by the lower pressure responsive part in a state in which the part is tilted downward, the displacement prevention stopper comes into contact with the shaft, preventing the actuating plate from falling off in the direction of the bottom plate. Damage can be suppressed and pressure resistance can be improved.

In this case, the shaft is located on the opposite side of the first side portion of the working plate from the pressure responsive portion, and is positioned on the first side portion with respect to the fulcrum across the contact position of the pressure responsive portion. and at a position closer to the bent portion of the operating plate than the deviation prevention stopper.

According to this configuration, even if excessive pressure is applied to the pressure responsive portion and the actuating plate loses the supporting relationship with the main body due to the breakage of the fulcrum, the deviation prevention stopper can accurately contact the shaft. As a result, it is possible to reliably prevent the actuating plate from falling off as described above, to reliably suppress damage to the main body and the pressure-responsive portion, and to further improve pressure resistance.

Further, it is arranged along the surface of the operating plate opposite to the pressure responsive portion side, has a bent portion at the free end, and is crimped to the first side portion of the operating plate using a rivet. A reset plate may be further provided, and the rivet may function as the anti-slip stopper by engaging with the shaft.

According to this configuration, the rivet for fixing the reset plate can be used as a deviation prevention stopper, so that the trouble and cost of providing the stopper can be saved.

Further, the operation plate may have a cut-and-raised portion protruding toward the shaft arrangement side on the first side portion, and the cut-and-raised portion may function as the deviation prevention stopper.

According to this configuration, the deviation prevention stopper can be easily configured simply by forming the cut-and-raised portion projecting toward the shaft arrangement side on the first side portion of the operating plate. In addition, there is no need to provide a separate member for the anti-slip stopper, and the number of parts can be reduced.

In addition, for example, a screw for adjusting the reset position of the working plate may be further provided, and the range of the rotational movement of the working plate may be restricted by adjusting the reset position with the screw.

According to this configuration, the rotational motion of the operating plate is restricted by adjusting the reset position with the screw, and the inclination is reduced, so that the operating plate can be made more difficult to fall off in the direction of the bottom plate.

According to the pressure switch of the present invention, even when excessive pressure is applied to the pressure responsive portion, the actuating plate is prevented from falling off and the pressure resistance is improved. Leakage can be prevented.

It is a sectional view showing a compression switch of an embodiment. It is a sectional view showing an operation state of a compression switch of an embodiment. It is a sectional view showing a compression switch of a modification. It is a sectional view showing the operation state of the compression switch in a modification.

A pressure switch according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. As shown in FIGS. 1 and 2, the pressure switch 1 of this embodiment includes a box-shaped main body 2 forming an outer shell as a case, a bellows 3 as a pressure responsive portion arranged at the bottom of the main body 2, and an L-shaped operating plate 4 that rotates around a fulcrum 2a by expansion and contraction of the bellows 3.

The actuating plate 4 has one first side portion on which the bellows 3 abuts in a horizontal direction, and the other second side portion in a vertical direction to stand against the first side portion. , an L-shape having a vertical side portion 4a as a second side portion and a horizontal side portion 4b as a first side portion. That is, the actuating plate 4 is formed in an L shape in which the vertical side portion 4a and the horizontal side portion 4b are bent with the bending portion 4c as a starting point. The actuating plate 4 is arranged with the bellows 3 in contact with the lower portion of the horizontal side portion 4b. A spring 5 that opposes the movement of the operation plate 4 and an operation shaft 6 that responds to the movement of the operation plate 4 are engaged with the vertical side portion 4 a of the operation plate 4 . 2, the spring 5 and the operating shaft 6 are omitted for convenience.

In the pressure switch 1, the operating shaft 6 has one end engaged with the vertical side portion 4a of the operating plate 4 and the other end engaged with the movable contact plate 11 constituting the microswitch 10. As shown in FIG. The microswitch 10 also has, for example, two fixed contacts 12A and 12B and a movable contact 13 arranged therebetween. In the microswitch 10, a movable contact 13 for the fixed contacts 12A and 12B is provided at the free end of the movable contact plate 11. As shown in FIG. Movable contact plate 11 has a quick reversing mechanism including deformation spring 14 . The movable contact plate 11 receives the operation of the operating plate 4 via the operating shaft 6, thereby causing the movable contact 13 to contact and separate from the fixed contacts 12A and 12B.

In such a pressure switch 1, when the pressure applied to the bellows 3 increases or decreases and the operating plate 4 rotates about the fulcrum 2a, the movable contact is moved through the operating shaft 6 responding to the movement of the operating plate 4. Plate 11 is activated. As a result, the movable contact plate 11 selectively connects the movable contact 13 between one or two fixed contacts 12A, 12B, and the microswitch 10 is reversed.

In the pressure switch 1, the main body 2 has a pressure rising side stopper 2b and a pressure falling side stopper 2c for restricting the rotational movement of the working plate 4, which are arranged vertically near the ends of the horizontal side portion 4b of the working plate 4. are provided at predetermined intervals in the direction. When excessive pressure is applied to the bellows 3, the operating plate 4 is held by the fulcrum 2a provided on the main body 2 and the pressure-increasing side stopper 2b provided on the upper side of the main body 2. Elongation of the bellows 3 is prevented.

Here, in the conventional pressure switch, when the pressure applied to the bellows becomes higher, the bellows tilts and stretches, which may cause the operating plate of the main body to tilt. Then, the actuating plate, which is no longer supported by the main body, is pushed up by the lower bellows in a state in which the end of the horizontal side is tilted downward, so that the end of the horizontal side is pushed up from the pressure lowering side stopper. There was a case where it came off and dropped in the direction of the bottom plate. In this case, the detachment of the actuating plate may not only damage the bellows, but also cause leakage of pressure medium such as refrigerant.

Therefore, the pressure switch 1 of this embodiment has a shaft 7 provided in the vicinity of the operating plate 4 in the main body 2 in the coaxial direction with the fulcrum 2a, and a position of the operating plate 4 closer to the end of the lateral side 4b than the shaft 7. and a misalignment prevention stopper 9 provided. As shown in FIG. 2, when excessive pressure is applied to the bellows 3 and the fulcrum 2a is destroyed, the stopper 9 is brought into contact with the shaft 7. As shown in FIG.

Specifically, the shaft 7 is located on the side opposite to the bellows 3 on the lateral side 4b of the operating plate 4 in the main body 2, and is located on the side of the lateral side 4b across the contact position of the bellows 3 with respect to the fulcrum 2a. It is provided on the other end side and at a position closer to the bent portion 4 c side of the operation plate 4 than the deviation prevention stopper 9 .

According to the present embodiment described above, even if excessive pressure is applied to the bellows 3 and the actuating plate 4 loses the supporting relationship with the main body 2 due to the breakage of the fulcrum 2a, the horizontal side portion 4b is Since it is pushed up by the lower bellows 3 in a state in which the end portion is tilted downward, the displacement prevention stopper 9 abuts on the shaft 7, thereby preventing the actuating plate 4 from falling off in the direction of the bottom plate. Damage to the bellows 3 can be suppressed, and pressure resistance can be improved.

Further, the shaft 7 is positioned opposite to the bellows 3 in the operating plate 4 inside the main body 2, and is diagonally to the fulcrum 2a and above the horizontal side portion 4b of the operating plate 4. Since it is provided at a position closer to the bending portion 4c of the working plate 4 than the bellows 3, an excessive pressure is applied to the bellows 3, and the bellows 3 extends while tilting. , the displacement prevention stopper 9 abuts the shaft 7 precisely to ensure that the actuating plate 4 does not come off as described above, thereby improving the pressure resistance, thereby surely suppressing the breakage of the bellows 3 and reducing the pressure medium. Leakage can be prevented.

Although not shown here, the actuating plate 4 is formed with a cut-and-raised portion protruding toward the arrangement side of the shaft 7 of the horizontal side portion 4b so that the cut-and-raised portion functions as a stopper to prevent displacement. good too. In this case, the slippage prevention stopper can be easily configured simply by forming an inwardly protruding cut-and-raised portion on the horizontal side portion 4b of the operating plate 4, and there is no need to provide the slippage prevention stopper as a separate member. has the advantage of reducing

Moreover, the pressure switch of the present invention is not limited to the embodiments described above. That is, as shown in FIGS. 3 and 4, in which parts corresponding to those in FIGS. 1 and 2 are denoted by the same reference numerals, the actuating plate 4 is arranged along the upper portion thereof, and has a bent portion 20a at its free end. A reset plate 20 crimped to the horizontal side portion 4b of the plate 4 using a rivet 21 may be further provided. For convenience, the spring 5 in FIG. 3 and the spring 5 and the operating shaft 6 in FIG. 4 are omitted.

In this case, the rivet 21 functions as a stopper to prevent displacement by engaging with the shaft 7 . Although not shown here, the operation plate 4 may have a cut-and-raised portion projecting inward from the horizontal side portion 4b, and the cut-and-raised portion may function as a stopper to prevent deviation.

According to the above modified example, the reset plate 20 crimped by using the rivets 21 is further provided on the horizontal side portion 4b of the operation plate 4, and the rivets 21 for fixing the reset plate 20 can be diverted as deviation prevention stoppers. In addition to the effects of the embodiment described above, it is possible to save the labor and cost of providing a stopper.

Although the embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments, and design modifications and the like are made within the scope of the present invention. is included in the present invention.

REFERENCE SIGNS LIST 1 pressure switch 2 main body 2a fulcrum 3 bellows (pressure-responsive part)
4 actuating plate 4a vertical side (second side)
4b Horizontal side (first side)
4c bent portion 4d cut-and-raised portion 5 spring 6 operating shaft 7 shaft 9 displacement prevention stopper 10 microswitch 11 movable contact plate 12A, 12B fixed contact 13 movable contact 14 deformation spring 20 reset plate 21 rivet 22 screw

Claims (4)

a pressure responsive part within the main body, an actuating plate that contacts the pressure responsive part and rotates around a fulcrum provided on the main body by expansion and contraction of the pressure responsive part, a spring that opposes the movement of the actuating plate; A pressure switch having an operating shaft that responds to movement of the operating plate, and a movable contact plate that brings the movable contact into contact with and separates from the fixed contact by the operation of the operating shaft,
the actuating plate has a first side portion with which the pressure responsive portion abuts, and a second side portion continuous with one end side of the first side portion via a bent portion;
A shaft is provided in the main body in a direction coaxial with the fulcrum in the vicinity of the first side portion of the working plate,
The actuating plate is provided with a deviation prevention stopper located on the other end side of the first side portion relative to the shaft,
A pressure switch according to claim 1, wherein when excessive pressure is applied to the pressure responsive portion, movement of the actuating plate is restricted by abutment of the shift prevention stopper against the shaft. The axis is
a position on the side opposite to the pressure responsive portion on the first side portion of the actuating plate, the other end side of the first side portion across the contact position of the pressure responsive portion with respect to the fulcrum; 2. The pressure switch according to claim 1, wherein the pressure switch is provided at a position closer to the bent portion of the operating plate than the deviation prevention stopper. A reset plate disposed along a surface of the operating plate opposite to the pressure responsive portion, having a bent portion at a free end, and crimped to the first side portion of the operating plate using a rivet. further comprising
3. The pressure switch according to claim 1, wherein the rivet functions as the deviation prevention stopper by engaging with the shaft. the actuating plate has a cut-and-raised portion protruding toward the shaft arrangement side on the first side;
4. The pressure switch according to claim 2, wherein the cut-and-raised portion functions as a stopper for preventing deviation.

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