Micro switches and pressure response switches

Abstract

The object of the present invention is to provide a manual reset type micro switch and a pressure response switch with high reliability of operation. The micro switch (1) comprises a rod (16) that rotates in a forward direction (a) and a backward direction (b) around a rotation axis (15), a movable contact (42) that performs a reverse action as the rod (16) rotates, a fixed contact (41) and a reset component (70). The range of rotation of the rod (16) includes a first reverse position where a reverse action occurs when the rod (16) passes in the forward direction, and a second reverse position where a reverse action occurs when the rod (16) passes in the backward direction. The reset component (70) can be displaced to a limiting position (P1) between the first reverse position and the second reverse position to limit the rotation of the rod (16) in the backward direction after passing through the first reverse position in the forward direction, and a reset position (P2) where the rod (16) in the backward direction rotates to pass through the second reverse position.

Description

Technical Field

[0001] The invention relates to a micro switch and a pressure response switch. Background Art

[0002] In the past, a micro switch with a manual reset mechanism is known (for example, refer to Patent Document 1). In the micro switch (thermal relay) described in Patent Document 1, as shown in the first figure of Patent Document 1, a movable contact 5 is provided between the NO contact 9 and the NC contact 10 as fixed contacts, and the movable contact 5 is supported by a movable contact plate 14. The movable contact plate 14 is connected to the adjustment plate 12 via a reversing spring 13. An adjustment screw 11 that can press the adjustment plate 12 in the plate thickness direction by tightening is arranged near the adjustment plate 12. In this micro switch, by adjusting the tightening amount of the adjustment screw 11, the adjustment plate 12 is displaced, and the reversing force of the reversing spring 13 generated thereby is adjusted, thereby adjusting the reset position of the movable contact plate 14.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Utility Model Publication No. 53-149869 Summary of the invention

[0006] Problems to be solved by the invention

[0007] In the micro switch described above, the reset position is determined by the balance of the force of the adjustment plate 12 and the reversing force of the reversing spring 13. Therefore, it is considered that the state of the movable contact 5 cannot be determined according to the deviation of the size of the adjustment plate 12, the deviation of the size of the reversing spring 13, etc. In addition, it is also considered that the tightening amount of the adjustment plate 12 is offset due to the influence of vibrations acting on the micro switch. Therefore, an undesirable automatic reset or a failure to reset may occur, making it difficult to accurately operate the manual reset mechanism.

[0008] An object of the present invention is to provide a manual reset type micro switch and a pressure response switch with high operational reliability.

[0009] Solutions to Solve Problems

[0010] In order to solve the above-mentioned problems and achieve the purpose, the microswitch of the present invention comprises: a rod that rotates in the forward direction and the backward direction around the rotation axis; a movable contact that performs a reverse action as the above-mentioned rod rotates; a pair of fixed contacts that can be conductive with the above-mentioned movable contact; and a regulating part that regulates the position of the rotation direction of the above-mentioned rod. The microswitch is characterized in that the range of rotation of the above-mentioned rod includes a first reversal position where the above-mentioned reversal action occurs when the above-mentioned rod passes toward the above-mentioned forward direction and a second reversal position where the above-mentioned reversal action occurs when the above-mentioned rod passes toward the above-mentioned backward direction, and the above-mentioned regulating part is configured to be able to be displaced to a limiting position and a reset position, the above-mentioned limiting position is a position between the above-mentioned first reversal position and the above-mentioned second reversal position that limits the rotation of the above-mentioned rod toward the above-mentioned backward direction after passing through the above-mentioned first reversal position in the above-mentioned forward direction, and the above-mentioned reset position is a position where the above-mentioned rod toward the above-mentioned backward direction is rotated to a position passing through the above-mentioned second reversal position.

[0011] According to the present invention, the position of the rod in the direction of rotation can be specified by displacing the position of the specified part, and the position of the movable contact can be specified according to the position of the rod in the direction of rotation. Therefore, the limit position can be accurately determined according to the position of the specified part, and the state of limiting the rotation of the rod from the limit position to the backward direction can be accurately maintained, and the reversing action of the movable contact can be accurately managed. This is different from the structure of the existing micro switch shown in patent document 1, which relies on the balance of force to make the reset mechanism work. That is, this structure is different from the structure in which the state of the movable contact 5 cannot be determined due to the deviation of the size of the adjustment plate 12 and the reversing spring 13, and the fastening amount of the adjustment plate 12 is offset due to the influence of vibration, etc., and the reset mechanism can be accurately operated by managing the position of the specified part. Therefore, according to this structure, it is possible to prevent accidental automatic reset, and the reset work can be reliably performed when necessary. Therefore, it is possible to provide a manual reset type micro switch with high reliability of action.

[0012] In addition, it is preferred that the limiting portion comprises: a reset plate that defines the position of the rod in the rotation direction; and a reset shaft that moves the reset plate forward and backward in the axial direction, the reset position being located on one side of the axial direction, and the limiting position being located on the other side of the axial direction. According to such a structure, the reset plate can be easily displaced to the limiting position and the reset position by moving the reset shaft forward and backward in the axial direction.

[0013] In addition, it is preferred that: a force applying unit is provided, which applies force to the reset shaft toward the other side of the axial direction, and by overcoming the force of the force applying unit to press the reset shaft toward one side of the axial direction, the specified portion can be displaced to the reset position, and when the reset shaft is not pressed in, the specified portion is located at the limit position. According to such a structure, by pressing the reset shaft toward one side of the axial direction, the reset plate can be displaced to the reset position, and by stopping the pressing of the reset shaft, the reset plate can be automatically displaced to the limit position and located at the limit position by the force of the force applying unit.

[0014] In addition, the pressure responsive switch of the present invention is characterized by being equipped with any of the micro switches described above. According to this structure, the pressure responsive switch can be constituted by using a manual reset type micro switch with high operational reliability.

[0015] Effects of the Invention

[0016] According to the present invention, it is possible to provide a manual reset type micro switch having high operational reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a bottom view of a pressure responsive switch equipped with a micro switch according to an embodiment of the present invention.

[0018] Figure 2 It is a three-dimensional diagram of a micro switch.

[0019] Figure 3 It is a top view of the micro switch.

[0020] Figure 4 is along Figure 2 A cross-sectional view of the micro switch when the manual reset mechanism is released, taken along line AA.

[0021] Figure 5 is along Figure 2 A cross-sectional view of the micro switch cut along the line AA in FIG. 1 shows a state where the manual reset mechanism is waiting to be released.

[0022] Figure 6 This is a bottom view of the micro switch.

[0023] Figure 7 This is a schematic diagram showing the operation of a micro switch having an automatic reset mechanism.

[0024] Figure 8 This is a schematic diagram showing the operation of a micro switch having a manual reset mechanism until the pressure drops.

[0025] Fig. 9 This is a schematic diagram showing the operation of a micro switch having a manual reset mechanism after pressure reduction.

[0026] Fig.10 It is a schematic diagram showing the adjustment operation of the manual reset mechanism.

[0027] In the figure:

[0028] a—forward direction, b—reverse direction, P1—limit position, P2—reset position, 1—micro switch, 15—rotation axis, 16—rod, 41—fixed contact, 42—movable contact, 70—reset component (specified portion). DETAILED DESCRIPTION

[0029] Hereinafter, an embodiment of the present invention will be described. The micro switch 1 of this embodiment is, for example, mounted on a pressure response switch 100 for detecting pressure changes of a fluid or temperature changes of a fluid, and for example, a working medium of a refrigeration cycle, an automobile, an actuator for various controls, etc. is used as a fluid to detect pressure changes and temperature changes of the fluid. In addition, in the following description, in the accompanying drawings, the axial direction of the working shaft 20 and the reset shaft 71 described later is indicated by an arrow Z, which is recorded as the "upper side Z1" and the other side is recorded as the "lower side Z2". In addition, the horizontal directions intersecting the upper and lower directions Z are indicated by arrows X and Y, which are recorded as the "front and rear direction X" and the "left and right direction Y" respectively. In addition, one side of the front and rear direction X is recorded as the "front side X1" and the other side is recorded as the "rear side X2", one side of the left and right direction Y is recorded as the "left side Y1" and the other side is recorded as the "right side Y2". The definitions of these directions are only for the convenience of explanation, and are not necessarily consistent with the directions of the micro switch 1 in the actual use state, and do not limit the directions of the micro switch 1 in the actual use state.

[0030] like Figure 1 As shown, the pressure response switch 100 includes a housing 110 that is generally rectangular in shape. The housing 110 is configured to include a C-shaped main frame 111 that opens to the lower side Z2 and a cover (not shown) that closes the opening of the main frame 111, and various components such as the micro switch 1 described later are stored inside. The main frame 111 is formed by bending a metal plate, etc., and includes a front wall 112, a top wall 113, and a rear wall 114. A pair of members 115 and a pair of joint pipes 116 that are respectively connected to the pair of members 115 are connected to the rear wall 114 of the housing 110. The member 115 includes a sensing component such as a bellows or a diaphragm (not shown) inside. The sensing component is deformed or displaced in the front-rear direction X according to the pressure change of the pressure fluid introduced through the joint pipe 116.

[0031] A pair of left and right transmission mechanisms 117 and a pair of left and right switch components 118 are housed inside the housing 110. The transmission mechanism 117 includes a reinforcing plate 119 formed into a C-shape opening to the upper side Z1 by bending a metal plate, and a transmission component 120 is housed inside the reinforcing plate 119. An example of the transmission component 120 is a working plate 121, which receives the force of deformation or displacement of the above-mentioned sensing component as an external force, rotates around the rotation axis 122, thereby converting the external force into an operating force, and transmitting the operating force to the pressing arm 17 or the rod 16 (response component) described later. The switch component 118 is configured to include a plurality of contacts 40 described later, and receives the above-mentioned operating force to change the conduction state of the contacts 40. A pair of switch components 118 are disposed adjacent to each other in the left-right direction Y, forming a double-type micro switch 1. The micro switch 1 is configured to include a manual reset mechanism 2 described later, and by operating a reset button 76 in the manual reset mechanism 2, the contact 40 in a predetermined conduction state can be manually switched to a different conduction state.

[0032] Figure 2 is a three-dimensional diagram of a micro switch 1. Figure 3 is a top view of the micro switch 1. Figure 2 In the embodiment, the reset shaft 71 and reset plate 72, which constitute the manual reset mechanism 2, which are described later, are omitted. The micro switch 1 includes a box portion 10. The box portion 10 is formed into a substantially cubic shape by a material such as a resin, and a storage space 11 for storing various structures is formed inside the box portion 10. A connecting portion 13 protruding to the rear side X2 is formed on the rear wall 12 of the box portion 10. The connecting portion 13 is formed into a plate shape extending in the up-down direction Z and is fixed to the housing 110 of the pressure response switch 100 described above. A rectangular box-shaped fixing component 14 is installed on the upper wall of the box portion 10. In the present embodiment, a pair of fixing components 14 are arranged and installed in the left-right direction Y. A rotating shaft 15 extending in the left-right direction Y is fixed to the side wall of each fixing component 14, and a rod 16 is installed on the rotating shaft 15 so as to be rotatable around the axis. That is, a pair of rods 16 are provided. In addition, in the present embodiment, "rotation" refers to forward and reverse rotation around the rotating shaft 15 within a predetermined angle range.

[0033] The rod 16 is a plate-shaped working member made of a metal material, extends from the rotation axis 15 toward the front side X1, and is provided to be rotatable in the forward direction a and the backward direction b around the rotation axis 15. Figure 2In the initial state shown, the rod 16 is urged in the backward direction b by a force-applying unit (not shown) so as to be inclined in a manner that it is located on the upper side Z1 as it moves from the rear end portion supported by the rotating shaft 15 toward the front end portion. The rod 16 is rotated in the forward direction a around the rotating shaft 15 by receiving an external force. Examples of the external force include a force generated by a pressure change of the refrigerant in the above-mentioned refrigeration cycle. Such a force is applied to a sensing component (not shown) mounted on the pressure switch, and is then moved to the upper side Z1 via the external force. Figure 3 The pressing arm 17 shown transmits the force to the rod 16. The pressing arm 17 is formed into a substantially L-shape in a plan view by bending a metal plate or the like.

[0034] The tip of the pressing arm 17 is arranged on the upper side Z1 to overlap with the portion of the front end of the rod 16 other than the inner side portion in the left-right direction Y, and is displaced to the lower side Z2 according to the force applied to the sensing member, so that the rod 16 rotates in the forward direction a around the rotation axis 15. A receiving portion 18 is formed on the plate surface of the rod 16. Figure 4 As shown, the receiving portion 18 is formed by making the middle portion of the plate surface of the rod 16 in the front-back direction X protrude to the upper side Z1, and has a V-shaped cross-section surface opened to the lower side Z2. The receiving portion 18 supports a working shaft 20 with an axis extending in the up-down direction Z. The working shaft 20 is a shaft component that converts the rotational motion of the rod 16 into an advance and retreat motion in the up-down direction Z.

[0035] The working shaft 20 is connected to the box portion 10 so as to be movable forward and backward along the vertical direction Z when inserted into the through hole 19 that penetrates the upper wall of the box portion 10 along the vertical direction Z. The upper end of the working shaft 20 constitutes a pressed portion 21 pressed by the rod 16. In the present embodiment, the pressed portion 21 is in sliding contact with the V-shaped inner surface of the receiving portion 18 in the rod 16 and the lower side Z2 is pressed. On the other hand, the lower end of the working shaft 20 constitutes an engaging portion 22 engaged with a switching unit 30 described later. The switching unit 30 is a structure for switching the conduction state of the contact 40 arranged in the storage space 11, and is provided with a movable piece 31 engaged with the engaging portion 22 of the working shaft 20, a snap piece 32 abutting against the front end side of the movable piece 31, and a conduction piece 33 having a movable contact 42 described later that is applied force to the upper side Z1 or the lower side Z2 by the snap piece 32.

[0036] The snap-on piece 32 applies force to the movable contact 42 toward the upper side Z1 or the lower side Z2 according to the position of the engaging portion 22 of the working shaft 20. Specifically, in the above-mentioned initial state where the pressing arm 17 does not press the rod 16, the snap-on piece 32 applies force to the movable contact 42 toward the lower side Z2. Then, starting from this, the pressing arm 17 presses the rod 16, and the working shaft 20 descends. As the engaging portion 22 moves toward the lower side Z2, the snap-on piece 32 gradually deforms while maintaining the direction of the force applied toward the lower side Z2. Then, when the engaging portion 22 of the working shaft 20 exceeds the lower limit position (not shown) and moves toward the lower side Z2, the snap-on piece 32 cannot maintain the direction of the force applied toward the lower side Z2, and reverses toward the upper side Z1, as shown in FIG. Figure 5 As shown, the movable contact 42 is forced toward the upper side Z1. Then, from this state, the engaging portion 22 of the operating shaft 20 rises, and as the engaging portion 22 moves toward the upper side Z1, the snap-on piece 32 gradually deforms while maintaining the force direction toward the upper side Z1. Then, when the engaging portion 22 of the operating shaft 20 exceeds the upper limit position (a position closer to the upper side Z1 than the lower limit position described above) and moves toward the upper side Z1, the snap-on piece 32 cannot maintain the force direction toward the upper side Z1, and reverses toward the lower side Z2, as shown in FIG. Figure 4 As shown, movable contact 42 is urged toward downward side Z2.

[0037] The contact 40 is a conducting component made of a conductive material, and includes a pair of fixed contacts 41 fixed in the storage space 11 and a movable contact 42 arranged between the pair of fixed contacts 41. The pair of fixed contacts 41 is composed of a first fixed contact 41A and a second fixed contact 41B. The first fixed contact 41A is fixed to the inner wall of the box portion 10 in a state facing the upper side Z1. The second fixed contact 41B is arranged on the upper side Z1 of the first fixed contact 41A, and is fixed to the inner wall of the box portion 10 in a state facing the lower side Z2 and facing the first fixed contact 41A. The movable contact 42 is fixed to the front end of the conducting piece 33, and can be conductive with the first fixed contact 41A or the second fixed contact 41B by displacing in the direction of the force applied by the snap piece 32, that is, the upper side Z1 or the lower side Z2, and abutting against the first fixed contact 41A or the second fixed contact 41B.

[0038] Moreover, as described above, the movable contact 42 can perform a reverse action and switch the conduction target by changing the direction of the applied force due to the reversal of the vertical direction Z of the buckle piece 32. Specifically, the movable contact 42 can be switched to the first conduction state (Z2) in which it is displaced to the lower side and is connected to the first fixed contact 41A. Figures 7 to 9 The second conducting state (“Working-Fixed A: ON” in the table of FIG. 1 ) and the second conducting state ( Figures 7 to 9In the following description, the “first conduction state” is sometimes referred to as the first conduction state (operating-fixed A: ON), and the “second conduction state” is sometimes referred to as the second conduction state (operating-fixed A: OFF).

[0039] In the present embodiment, in the above-mentioned initial state where the pressing arm 17 does not press the rod 16, the snap-on piece 32 applies force to the movable contact 42 toward the lower side Z2, whereby the movable contact 42 becomes the first conductive state. The contact 40 thus constructed is connected to a terminal 50. The terminal 50 is a component that connects the above-mentioned first fixed contact 41A, the second fixed contact 41B, and the movable contact 42 one-to-one, and is formed into a plate shape using a conductive material. In the present embodiment, a pair of rods 16 are provided in the box portion 10, so a pair of working shafts 20, switching units 30, and contacts 40 corresponding to each rod 16 are also provided. Thus, a total of six contacts 40 are provided. Therefore, as Figure 6 As shown, a total of six terminals 50 are provided. The terminal 50 is inserted into the insertion hole 10a formed in the lower wall of the box portion 10, and is fastened by the fastening member 123 (see Figure 1 ) The mounting portion 51 to which the lower end of the electric wire (not shown) is connected is bent so that the mounting portion 51 is fixed along the lower wall of the box portion 10.

[0040] Here, in this embodiment, the micro switch 1 has a snap piece 32. Therefore, in the case where there is no mechanism related to the manual reset mechanism 2 (described later), that is, in the case of a so-called automatic reset type micro switch, the following operation is performed with the rotation of the rod 16. That is, Figure 7 As shown in the "initial (0 MPa)" in the table, the rod 16 in the initial state is as follows Figure 7 As shown in "Pressure Rising" in the table, the pressure of the fluid rises and the rod 16 rotates in the forward direction a. As a result, the working shaft 20 descends. When the engaging portion 22 exceeds the lower limit position of the snap plate 32 and cannot maintain the force direction of the lower side Z2 and moves to the lower side Z2, the snap plate 32 reverses. As a result, the movable contact 42 reverses and the conduction state switches from the first conduction state (working-fixed A: ON) to the second conduction state (working-fixed A: OFF). The state of the rod 16 when the reverse action occurs is shown in Figure 7 In addition, the above-mentioned automatic reset type micro switch is sometimes also called an automatic recovery type micro switch.

[0041] In this embodiment, the position where the rod 16 is reversed when it passes in the forward direction a is set as the first reverse position (at the position of Figure 7 to Figure 9According to this structure, for example, by mounting the micro switch 1 on a pressure switch, a high-voltage cut-off switch can be configured that switches the conduction state from the first conduction state to the second conduction state when abnormal high pressure occurs. And, as described above, in the case of an automatic reset type (or automatic recovery type) micro switch, such as Figure 7 As shown in the "Pressure Dropping" in the table, after the above-mentioned reversal action (i.e. after cutting off), due to the decrease in the pressure of the fluid, the rod 16 rotates in the backward direction b, the working shaft 20 rises, and returns to the first conduction state before switching ( Figure 7 When the engaging portion 22 exceeds the upper limit position at which the snap-on piece 32 cannot maintain the force direction of the upper side Z1 and moves toward the upper side Z1, the snap-on piece 32 reverses, and the movable contact 42 reverses accordingly. As a result, the conduction state is switched from the second conduction state to the first conduction state.

[0042] In the present embodiment, the position where the rod 16 undergoes a reverse motion when it passes in the backward direction b is defined as the second reverse position (at Figure 7 to Figure 9 According to this structure, the range of rotation of the rod 16 includes a first reversal position (rising point) where a reversal action occurs when the rod 16 passes in the forward direction a, and a second reversal position (falling point) where a reversal action occurs when the rod 16 passes in the backward direction b. Thus, in this way, the micro switch 1 of the present embodiment is configured as a switch in which the first reversal position and the second reversal position are different positions, the first reversal position being a setting value of a trigger for performing a high-voltage cutoff, and the second reversal position being a setting value of a trigger for returning to the original state. In addition, in the following description, the "first reversal position" is sometimes referred to as the first reversal position (rising point), and the "second reversal position" is sometimes referred to as the second reversal position (falling point).

[0043] The micro switch 1 thus constructed has a manual reset mechanism 2. The manual reset mechanism 2 is used, for example, in the following situations, that is, when the above-mentioned high voltage cut-off occurs, the second conduction state is maintained for the purpose of subsequent maintenance work by the operator, and after the maintenance work is completed, the maintenance of the second conduction state is cancelled and the first conduction state is restored. Figure 4 As shown, the manual reset mechanism 2 has a mounting hole 60 formed through the box portion 10. The mounting hole 60 has: a shaft support portion 61, which extends in the up-down direction Z and opens on the upper wall of the box portion 10; a spring receiving portion 62, which is continuous with the lower end of the shaft support portion 61, has an inner diameter larger than that of the shaft support portion 61 and extends to the lower side Z2; and a button supporting portion 63, which is continuous with the lower end of the spring receiving portion 62, has an inner diameter larger than that of the spring receiving portion 62 and opens on the lower wall of the box portion 10.

[0044] A reset member 70 (specified portion) is inserted into the mounting hole 60 at a position that specifies the rotation direction of the rod 16. The reset member 70 includes a cylindrical reset shaft 71 extending in the vertical direction Z. A threaded portion (not shown) is formed on the upper end side of the reset shaft 71, and a reset plate 72 protruding toward the rear side X2 is threadedly engaged with the threaded portion. Figure 3 As shown, the reset plate 72 includes: a main body 72a in a substantially rectangular plate shape, the four corners of which are cut off; and a pressing portion 72b, which protrudes outward in the left-right direction Y from the outer edge of the main body 72a in the left-right direction Y. The lower surface of the pressing portion 72b is set to be able to press the upper surface of the inner part of the front end of the rod 16 in the left-right direction Y, and when the reset plate 72 is displaced in the up-down direction Z according to the displacement of the reset shaft 71 in the up-down direction Z, the rod 16 is pressed to the lower side Z2, so that the position of the rod 16 in the rotation direction can be determined. That is, the reset shaft 71 causes the reset plate 72 to move forward and backward in the up-down direction Z, and the reset plate 72 determines the position of the rod 16 in the rotation direction through this forward and backward movement.

[0045] In addition, the reset plate 72 can be displaced in the vertical direction Z relative to the reset shaft 71 by performing thread feeding at the above-mentioned threaded engagement portion. A first E-shaped ring 73 is installed on the lower side Z2 of the reset plate 72 (between the reset plate 72 and the opening of the reset plate 72 side of the mounting hole 60). The first E-shaped ring 73 is provided to protrude radially outward from the reset shaft 71, and its lower surface can abut against the upper wall of the box portion 10. Thus, as Figure 5 As shown, the reset shaft 71 is restricted from being displaced to the lower side Z2 from the position where the lower surface of the first E-shaped ring 73 abuts against the upper wall of the box portion 10. That is, the first E-shaped ring 73 defines the lower end position L of the reset shaft 71. On the other hand, a second E-shaped ring 74 is installed on the lower end side of the reset shaft 71. The second E-shaped ring 74 is arranged to protrude radially outward from the reset shaft 71, and its upper surface can abut against the step portion at the boundary between the spring receiving portion 62 and the button supporting portion 63. Thus, as Figure 4 As shown, the reset shaft 71 is restricted from displacing upward Z1 from the position where the upper surface of the second E-shaped ring 74 abuts against the step portion at the boundary between the spring receiving portion 62 and the button supporting portion 63. That is, the second E-shaped ring 74 defines the upper end position H of the reset shaft 71.

[0046] A return spring 75 (force applying unit) is accommodated between the second E-shaped ring 74 and the upper end of the spring receiving portion 62. That is, the second E-shaped ring 74 also functions as a spring seat. The return spring 75 applies force to the return shaft 71 toward the lower side Z2 via the second E-shaped ring 74. A return button 76 is installed at the lower end of the return shaft 71. The return button 76 is an operating part when the operator displaces the return shaft 71 in the vertical direction Z, and Figure 6As shown, it is formed into an oblong shape when viewed from above. The reset button 76 is supported by the button support portion 63, and can be pressed into the step portion of the boundary with the spring receiving portion 62 in the button support portion 63 toward the upper side Z1. Moreover, by pressing the reset button 76, the reset shaft 71 overcomes the force of the reset spring 75 and moves to the upper side Z1. In addition, the force of the reset spring 75 and the pressing amount of the reset button 76 can be appropriately adjusted, but in this embodiment, when the reset button 76 is pressed to the limit, the reset shaft 71 moves to the upper end position H. On the other hand, when the reset button 76 is not pressed, the reset shaft 71 is automatically located at the lower end position L by the force of the reset spring 75.

[0047] Next, the operation of the micro switch 1 will be described. Figure 8 This is a schematic diagram showing the operation of the micro switch 1 including the manual reset mechanism 2 until the pressure drops. Fig. 9 2 is a schematic diagram showing the operation of the micro switch 1 having the manual reset mechanism 2 after the "pressure is reduced". Figure 8 , 9 ( Fig.10 ), in order to avoid complication of the figure, the rotating shaft 15, the rod 16 and the reset plate 72 are shown in schematic shapes rather than actual shapes. First, when the reset button 76 is not operated, as shown in FIG. Figure 8 As shown in "Initial (0 MPa)" in the table, the rod 16 is located between the first reversal position and the second reversal position in a state of contact with the reset plate 72. In this state, the movable contact 42 is conductively connected to the first fixed contact 41A, which is the first conductive state (operating-fixed A: ON).

[0048] From this state, Figure 8 As shown in "Pressure Rising" in the table, the pressure of the fluid rises. When the pressure of the fluid rises further from this state and becomes abnormally high pressure exceeding the assumption, as shown in Figure 8 As shown in the "Above rising working value" in the table, the rod 16 moves in the forward direction a and exceeds the first reversal position (rising point). As a result, the movable contact 42 reverses and moves upward Z1 to conduct with the second fixed contact 41B, switching to the second conduction state (working-fixed A: OFF). And, when the pressure of the fluid drops from this state, as shown in Figure 8 As shown in the "pressure decreasing" in the table, the rod 16 rotates in the backward direction b. Fig. 9 As shown in “below descending operation value = waiting for release” in the table, the rotation is restricted by the rod 16 abutting against the reset plate 72 .

[0049] Thus, the position where the rod 16 is limited in rotation toward the backward direction b after passing through the first reversal position (ascending point) in the forward direction a is defined as the “limited position P1” between the first reversal position (ascending point) and the second reversal position (descending point). Figure 5 As shown, the contact position between the reset plate 72 and the rod 16 when the reset shaft 71 is at the lower end position L is the limit position P1. In addition, as described above, the micro switch 1 of the present invention is configured as a switch in which the first reversal position (ascending point) and the second reversal position (descending point) are different positions, and the first reversal position is a setting value of a trigger for performing high-voltage cutoff, and the second reversal position is a setting value of a trigger for returning to the original state. Therefore, in a state where the rotation of the rod 16 in the retreat direction b is restricted at the limit position P1, the position of the rotation direction of the rod 16 is different from that of the rod 16 in the reverse direction b. Figure 8 The position of the rotation direction shown by "initial 0 MPa" in the table is equally between the first reversal position (rising point) and the second reversal position (falling point), but the reversal action of the movable contact 42 does not occur, and the second conductive state is maintained.

[0050] Thus, for example, when a design is made to sound an alarm in the second conduction state, even if some abnormality occurs and the abnormality is automatically improved, the operator can be notified of the abnormality. Therefore, it is useful for the operator to perform maintenance work, etc. And, after completing the maintenance work, etc., in order to return the movable contact 42 from the second conduction state to the first conduction state and reset it, it is necessary to move the reset plate 72 to a position where the rod 16 can rotate in the backward direction b and pass through the second reversal position (drop point). Therefore, if Figure 4 As shown, the reset button 76 is pushed upward to Z1, so that the reset shaft 71 and the reset plate 72 are displaced upward to Z1. Fig. 9 As shown in the table "Release (button pressed)", the rod 16 can rotate in the backward direction b and pass the second reversal position in the same direction. At this time, a reversal action occurs, and the movable contact 42 switches from the second conduction state (operation-fixed A: OFF) to the first conduction state (operation-fixed A: ON).

[0051] The position where the rod 16 is rotated in the backward direction b to pass through the second reversal position (the descending point) is defined as the "reset position P2". Figure 4As shown, the contact position between the reset plate 72 and the rod 16 when the reset shaft 71 is at the upper end position H is the reset position P2. With such a structure, in the up-down direction Z of the reset shaft 71, the reset position P2 is located at the upper side Z1 (one side in the axial direction), and the limit position P1 is located at the lower side Z2 (the other side in the axial direction), and the reset plate 72 (reset component 70) is supported to be able to move to the reset position P2 and the limit position P1. And, finally, when the reset button 76 is released from being pressed, the reset shaft 71 automatically moves to the lower side Z2 by the force of the reset spring 75, and the reset plate 72 returns to the original position (limit position P1), and the action of the manual reset mechanism 2 is completed.

[0052] In addition, as described above, in the present embodiment, the contact position between the reset plate 72 and the rod 16 when the reset shaft 71 is located at the lower end position L is the limit position P1, and the contact position between the reset plate 72 and the rod 16 when the reset shaft 71 is located at the upper end position H is the reset position P2. However, this is only an example, and any position can be set as the limit position P1 as long as it is a position that meets the definition of the above-mentioned limit position P1 and is a position that can be moved to the reset position P2. In addition, any position can be set as the reset position P2 as long as it is a position that meets the definition of the above-mentioned reset position P2 and is a position that can be moved to the limit position P1. Next, the adjustment action of the manual reset mechanism 2 is described. Fig.10 Schematic diagram showing the action of adjusting the manual reset mechanism 2. As described above, in the micro switch 1 of the present embodiment, when the movable contact 42 changes from the first conduction state to the second conduction state, the second conduction state is maintained. This is important in order to notify the operator, etc. of the abnormality, especially when the micro switch 1 detects an abnormality and changes from the first conduction state to the second conduction state. In other words, it is necessary to change from the second conduction state to the first conduction state only when the reset button 76 is pressed. Therefore, it is necessary that the rod 16 is accurately located at the limit position P1 and maintained in this state when the reset button 76 is not operated, and when the reset button 76 is operated, the rod 16 toward the retreat direction b reliably passes through the reset position P2, and therefore, it is necessary to accurately calculate the first reversal position (rising point) and the second reversal position (falling point).

[0053] Therefore, the manual reset mechanism 2 is adjusted. First, Fig.10 As shown in the "Initial" and "Forced Operation" in the table, the reset plate 72 is used to force the rod 16 in the initial state to rotate in the forward direction a, so that it is located at the position where the first conductive state changes to the second conductive state, that is, the first reversal position (rising point). At this time, as described above, when the reset plate 72 is threadedly fed to move the reset plate 72 to the lower side Z2 relative to the reset shaft 71, the position of the reset plate 72 can be finely adjusted, which is useful. Next, as Fig.10As shown in "Searching for the descending point" in the table, for example, the reset plate 72 rotates the rod 16 in the backward direction b so that it is located at a position where the rod 16 changes from the second conductive state to the first conductive state, that is, the second reversal position (descending point).

[0054] At this time, if the reset plate 72 is moved to the upper side Z1 relative to the reset shaft 71 by threading the reset plate 72, the position of the reset plate 72 can be fine-tuned, which is useful. Through these actions, the first reversal position (rising point) and the second reversal position (falling point) can be accurately calculated. In this way, the reset position P2 can be accurately known, and the limit position P1 can be accurately determined. And finally, as Fig.10 As shown in "Adjustment" in the table, the rod 16 is rotated in the forward direction a by the reset plate 72, so that the rod 16 is located between the first reversal position (upward point) and the second reversal position (downward point), and this position is set as the limit position P1. Thus, the adjustment action of the manual reset mechanism 2 is completed.

[0055] In addition, it is also considered that, in contrast to the above-mentioned adjustment action, after the rod 16 is located at the second reversal position (descending point), it is located at the first reversal position (ascending point), and then the above-mentioned final adjustment is performed toward the second reversal position (descending point) side to define the limit position P1. However, according to the present embodiment, by performing the final adjustment from the second reversal position (descending point) toward the first reversal position (ascending point), the rod 16 can be reliably located closer to the first reversal position (ascending point) than the second reversal position (descending point), so that an unexpected automatic reset can be more reliably prevented.

[0056] According to the above-mentioned embodiment, the position of the rod 16 in the rotation direction can be specified by displacing the position of the reset member 70 (specifying portion), and the position of the movable contact 42 can be specified according to the position of the rod 16 in the rotation direction. Therefore, the limit position P1 can be accurately determined according to the position of the reset member 70, and the state of limiting the rotation of the rod 16 from the limit position P1 to the retreat direction b can be accurately maintained, and the reversing action of the movable contact 42 can be accurately managed. This is different from the structure of the existing micro switch shown in Patent Document 1, which relies on the balance of forces to make the reset mechanism operate. That is, this structure is different from the structure in which the state of the movable contact (5) cannot be determined due to the deviation of the size of the adjustment plate (12) and the reversing spring (13), and the tightening amount of the adjustment plate (12) is offset due to the influence of vibration, etc., and the manual reset mechanism 2 (reset mechanism) can be accurately operated by managing the position of the reset member 70. Therefore, according to this structure, it is possible to prevent accidental automatic reset, and the reset action can be reliably performed when necessary. Therefore, it is possible to provide a micro switch 1 (manual reset type micro switch) with high reliability of operation.

[0057] According to the present embodiment, the reset member 70 includes the reset shaft 71 and the reset plate 72. Therefore, by moving the reset shaft 71 forward and backward in the vertical direction Z (axial direction), the reset plate 72 can be easily displaced to the restriction position P1 and the reset position P2.

[0058] In addition, according to the present embodiment, by pressing the reset shaft 71 toward the upper side Z1, the reset plate 72 can be displaced to the reset position P2, and by stopping the pressing of the reset shaft 71, the reset plate 72 can be automatically displaced to the limit position P1 by the force of the reset spring 75 (biasing unit) and located at the limit position P1.

[0059] Furthermore, according to the present embodiment, the pressure responsive switch 100 can be configured using the microswitch 1 (manual reset type microswitch) having high operational reliability.

[0060] In addition, the above-described embodiment is only a representative embodiment of the present invention, and the present invention is not limited thereto. That is, it can be implemented by various deformations within the scope of the main purpose of the present invention. Through this deformation, as long as the structure of the micro switch 1 of the present invention is provided, it is of course also included in the scope of the present invention. For example, in the description of the present embodiment, it is described that the micro switch 1 and the manual reset mechanism 2 are used to detect abnormal high pressure, but on the contrary, the micro switch 1 and the manual reset mechanism 2 can also be used when detecting abnormal low pressure. In addition, the rod 16 is inclined in the initial state in a manner that it is located on the upper side Z1 as it moves from the rear end portion supported by the rotating shaft 15 toward the front end portion, but it can also be opposite to this, and the state after rotation in the present embodiment is set as the initial state of the rod 16, and the retreat direction b in the present embodiment is set as the forward direction a, and the action direction of the working shaft 20, the switching unit 30, and the manual reset mechanism 2 is adjusted accordingly, so as to construct the micro switch 1 and the manual reset mechanism 2.

[0061] In addition, the micro switch 1 and the manual reset mechanism 2 can be mounted on various switches in which the rod 16 rotates when a certain external force is applied to the pressure switch. For example, in the pressure response switch 100 of the present embodiment, the use as a pressure switch is mainly described, but the pressure response switch 100 can also be used as a temperature switch. That is, in the present embodiment, the use as a pressure switch is described as an example in which the pressure change is detected by introducing the fluid of the detection object (here, the refrigerant circulating in the refrigeration cycle) through the joint pipe 116 so that the pressure of the detection object directly acts on the sensing component such as the bellows or the diaphragm, but the use of the pressure response switch 100 is not limited to this. That is, the temperature sensing tube is connected to the component 115 in the pressure response switch 100 of the present embodiment through a capillary tube, and the refrigerant is filled into the closed space formed by the sensing component, the capillary tube and the temperature sensing tube, so that a temperature switch can be formed. Thus, in the temperature switch using the pressure response switch 100 of the present embodiment, the sensing component is deformed or displaced in the up-down direction Z according to the pressure inside the closed space that changes due to the temperature change detected by the temperature sensing tube, and the conduction state of the contact is changed by transmitting the force at this time to the rod 16 (response component).

[0062] In addition, in the present embodiment, the micro switch 1 includes a pair of rods 16, a corresponding working shaft 20, a switching unit 30, a contact 40, and a terminal 50, etc., which constitute a so-called double-type micro switch, but it is not limited to the double-type micro switch, and the present invention can be applied to various micro switches. In addition, in the present embodiment, in the manual reset mechanism 2, when the reset button 76 is not pressed, the reset shaft 71 is automatically displaced to the position before pressing by the force of the reset spring 75, but it is not limited to this, and the reset spring 75 may not be provided, so that the reset button 76 is manually operated to displace the reset shaft 71 to the position before pressing. By keeping the reset button 76 pressed, the micro switch 1 can also be used as the above-mentioned automatic reset type (automatic recovery type) micro switch. In addition, by removing the reset shaft 71, the reset plate 72 and other reset components 70 from the micro switch 1, the micro switch 1 can also be used as the above-mentioned automatic reset type micro switch.

Claims

1. A micro switch, comprising: a rod that rotates in a forward direction and a backward direction around a rotation axis; a movable contact that performs a reverse motion as the rod rotates; a pair of fixed contacts that can be electrically connected to the movable contact; and a regulating portion that regulates the position of the rotation direction of the rod, The micro switch is characterized in that: The range of rotation of the rod includes a first reversal position where the reversal action occurs when the rod passes toward the forward direction and a second reversal position where the reversal action occurs when the rod passes toward the backward direction. The prescribed portion is configured to be able to shift to a limiting position and a reset position, wherein the limiting position is a position between the first reversal position and the second reversal position that limits the rotation of the rod toward the backward direction after passing through the first reversal position in the forward direction, and the reset position is a position in which the rod toward the backward direction is rotated to a position passing through the second reversal position.

2. The micro switch according to claim 1, characterized in that: The regulating portion includes: a reset plate regulating the position of the rod in the rotation direction; and a reset shaft causing the reset plate to move forward and backward in the axial direction. The reset position is located on one side of the axial direction, and the limit position is located on the other side of the axial direction.

3. The micro switch according to claim 2, characterized in that: A force applying unit is provided to apply force to the reset axis toward the other side of the axis, By overcoming the urging force of the urging unit and pushing the reset shaft inward to one side in the axial direction, the prescribed portion can be displaced to the reset position. When the reset shaft is not pushed in, the prescribed portion is located at the restricted position.

4. A pressure-responsive switch, characterized in that: The micro switch according to any one of claims 1 to 3 is mounted.

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