Microswitch and switching device

Abstract

The utility model aims to provide a microswitch and a switching device. The microswitch is provided with a sealing structure which stably maintains the action of a working shaft and appropriately inhibits the invasion of foreign matters. A microswitch (1) is provided with: a housing (10); a micro operating shaft (30) inserted through an insertion hole (16a) of the housing; and a sealing member (40) covering the micro-working shaft about the axis. The sealing member (40) is provided with: a first cylindrical section (41) that rises from the housing; a second cylindrical section (42) that is disposed on the upper side (Z1) of the first cylindrical section (41) and that is connected to the micro-operating shaft; and at least one intersecting portion (43) extending in an intersecting direction intersecting the axial direction (Z). At least one of the intersection parts (43) constitutes a first intersection part (43a), a first corner part (45) is formed at the intersection of the first cylinder part (41) and the first intersection part (43a), and a second corner part (46) is formed at the intersection of the second cylinder part (42) and the first intersection part (43a).

Description

Technical Field

[0001] The utility model relates to a micro switch and a switch device. Background Art

[0002] In the past, a micro switch for a device or the like mounted on a device is known. The micro switch includes: a contact mechanism that opens and closes a circuit; a housing that accommodates the contact mechanism; and a micro-operating shaft that is inserted into the housing and extends to the inside and outside of the housing. When the micro-operating shaft is subjected to a predetermined pressing force from the outside of the housing toward the inside of the housing, it is displaced in a pressing direction, and the displacement acts on the contact mechanism to open and close the circuit. In such a micro switch, since there is a situation where foreign matter intrudes into the inside of the housing from the insertion hole through which the micro-operating shaft is inserted, a micro switch having a sealing structure around the micro-operating shaft is provided (for example, refer to patent document 1). In the micro switch described in patent document 1, the pressing member as the micro-operating shaft is connected to the rubber cap in a state where the pressing member is inserted into the top of the rubber cap formed into a dome shape, the pressing member is covered in the circumferential direction, and the insertion hole is covered at the opening periphery of the rubber cap, thereby shielding the insertion hole from foreign matter.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2019-160649 Utility Model Content

[0006] Issues to be Solved by Utility Models

[0007] However, the above-mentioned rubber cap is Figure 5 In the state before the pressing member shown in (a) is pressed, the whole is in a dome shape. Figure 5 When the pressing component shown in (b) is pressed, it becomes a partially concave shape constituting the top of the dome shape. That is, the rubber cap is deformed along with the displacement of the pressing component, from the primary mode of the overall dome shape to the secondary mode of the top concave, accompanied by the change of mode. Moreover, the deformation is, for example, a large deformation in which the direction of the tangent toward the top is reversed from upward to downward when a tangent is drawn along the curve of the wall surface of the rubber cap, so the rigidity of the rubber cap changes greatly. Therefore, even if a predetermined pressing force is applied to the pressing component, the deformation amount of the rubber cap will not reach the expected deformation amount, the pressing component may be actuated at an unexpected timing, and the action of the pressing component may be unstable.

[0008] The utility model aims to provide a micro switch and a switch device, which are provided with a sealing structure which can stably maintain the movement of an operating shaft and appropriately suppress the invasion of foreign matter.

[0009] Solutions to Solve Problems

[0010] In order to solve the above-mentioned problems and achieve the purpose, the micro switch of scheme 1 of the utility model is characterized in that it comprises: a housing; a working shaft, which is inserted into an insertion hole formed through the housing and displaced in the axial direction; and a cylindrical sealing component, which covers the working shaft around the axis and shields the insertion hole, the sealing component comprising: a first barrel, which stands up from the housing to one side of the axial direction; a second barrel, which has a central axis coaxial with the first barrel and an outer diameter smaller than the outer diameter of the first barrel, and is arranged on one side of the axial direction of the first barrel and connected to the working shaft; and at least one or more intersections, which extend in an intersection direction intersecting with the axial direction, at least one of the intersections constitutes a first intersection connecting the first barrel and the second barrel, a first corner portion facing a direction away from the working shaft in the intersection direction is formed at the intersection portion of the first barrel and the first intersection portion, and a second corner portion facing a direction close to the working shaft in the intersection direction is formed at the intersection portion of the second barrel and the first intersection portion.

[0011] According to the utility model, when the working shaft is displaced from one side to the other side in the axial direction in the housing, first, a load is applied to the second barrel of the sealing component connected to the working shaft in the displacement direction of the working shaft, and then the load is transmitted to the connecting part of the second barrel and the intersection, that is, the second corner. Through the transmission of the load, the second corner is deformed in the displacement direction of the working shaft, and the deformation of the first intersection and the second corner is deformed accordingly. Among them, the second barrel is configured to have a diameter smaller than the diameter of the first barrel, so the first intersection is deformed in a manner inclined in the displacement direction of the working shaft with the first corner that is farther away from the working shaft than the second corner in the intersection direction as a fulcrum. In this way, the main deformation of the sealing component becomes a deformation of the degree of inclination of the first intersection with the first corner as a fulcrum, and the directions of the first corner in the intersection direction facing away from the working shaft and the second corner in the intersection direction facing the direction close to the working shaft are not reversed. That is, it is possible to suppress the deformation of the sealing component accompanied by the mode change, such as the deformation of the dome-shaped rubber cap of the above-mentioned conventional micro switch. Therefore, for example, when a tangent line is drawn along the curve of the wall surface of the sealing component, it is possible to prevent the direction of the tangent line toward the working axis from being reversed from upward to downward, etc. As a result, the rigidity of the sealing component can be stabilized, so that the deformation amount of the sealing component relative to a predetermined force can be set to a target deformation amount, and the movement of the working axis can be set to a target movement. Therefore, it is possible to provide a micro switch having a sealing structure that stably maintains the movement of the working axis and appropriately suppresses the intrusion of foreign matter.

[0012] In addition, at this time, Scheme 2 is preferably that, in addition to the first intersection portion, the intersection portion also has a second intersection portion connecting the second cylinder portion and the working axis, and a third triangle portion is formed at the intersection portion of the second intersection portion and the second cylinder portion facing in the direction away from the working axis in the intersection direction.

[0013] According to such a structure, when the sealing member is deformed with the displacement of the working shaft, the second intersection portion can be tilted with the third corner portion as a fulcrum, and the first intersection portion can be tilted with the first corner portion as a fulcrum, so that the deformed portion can be dispersed to multiple portions. Therefore, the deformation of the sealing member caused by the above-mentioned mode change can be suppressed, the rigidity of the sealing member can be made more stable, and the deformation amount of the sealing member with respect to the predetermined force and the movement of the working shaft can be realized.

[0014] In addition, in scheme 3, it is preferred that a plurality of the operating shafts are provided, and the sealing member is provided so as to cover the plurality of the operating shafts collectively.

[0015] According to such a structure, the structure of the sealing member of the present invention can be applied also to a so-called double-type micro switch including a plurality of switches in a housing.

[0016] In scheme 4, preferably, the first cylinder portion is provided with a flange seal portion along a wall surface around the insertion hole of the housing, and a fixing member is further provided for pressing the flange seal portion in a thickness direction to fix it to the housing.

[0017] According to such a configuration, the sealing member can be securely fixed to the housing in close contact with the fixing member while pressing the flange sealing portion, thereby stably maintaining the sealing performance of the sealing member.

[0018] Furthermore, a switch device according to a fifth aspect of the present invention is characterized in that any of the above-mentioned micro switches is mounted thereon.

[0019] According to such a structure, a micro switch having a sealing structure that stably maintains the movement of the working shaft and appropriately inhibits the intrusion of foreign matter can be used to form a switch device. In addition, as a switch device, for example, a pressure switch for detecting the pressure of the refrigerant in the refrigeration cycle, a temperature switch for detecting the temperature of the refrigerant, etc. are included.

[0020] Utility Model Effect

[0021] According to the present invention, a micro switch and a switch device can be provided, which have a sealing structure that stably maintains the movement of an operating shaft and appropriately suppresses the intrusion of foreign matter. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a perspective view of a micro switch according to one embodiment of the present invention.

[0023] Figure 2 yes Figure 1 Section view along line AA.

[0024] Figure 3 It is an enlarged cross-sectional view of the micro operating shaft and sealing components of the micro switch.

[0025] Figure 4 It is an enlarged cross-sectional view of the sealing component.

[0026] Figure 5 This is an enlarged cross-sectional view of the micro working shaft and sealing components in the installed state.

[0027] Figure 6 It is an enlarged cross-sectional view of the micro working shaft and the sealing component in the initial state.

[0028] Figure 7 This is an enlarged cross-sectional view of the micro-operating shaft and the sealing component in the maximum pressed state.

[0029] In the figure:

[0030] Z—axial direction; Z1—upper side (one side); 1—micro switch; 10—housing (shell); 16a—through hole; 30—micro working shaft (working shaft); 40—sealing component; 41—first barrel; 42—second barrel; 43—intersection; 43a—first intersection; 45—first corner; 46—second corner. DETAILED DESCRIPTION

[0031] The following is based on Figure 1 to Figure 7 An embodiment of the utility model is described. The micro switch 1 of the present embodiment is mounted on a switch device such as a pressure switch for detecting the pressure of the refrigerant in a compressor of a refrigeration cycle, a temperature switch for detecting the temperature of the refrigerant, and constitutes a part of the switch device. The micro switch 1 comprises: a box-shaped housing 10 (shell); an operating part 20, which is arranged on the upper part of the housing 10; a micro working shaft 30 (working shaft), which moves forward and backward in the axial direction through the operating part 20; a sealing member 40 (sealing member), which covers the micro working shaft 30 around the axis; a switching unit 50, which acts on the force when the micro working shaft 30 is displaced in the axial direction; and a contact 60, which switches the conduction target through the switching unit 50.

[0032] In the following description, in the drawings, arrows X, Y, and Z are set to be mutually orthogonal. In addition, the axial direction of the micro-operating shaft 30 described later is indicated by arrow Z, which is recorded as "axial direction Z". In addition, one side of the axial direction Z is recorded as "upper side Z1", and the other side is recorded as "lower side Z2". In addition, arrows X and Y are used to indicate horizontal directions, which are recorded as "front-rear direction X" and "width direction Y", respectively. In addition, one side of the front-rear direction X is recorded as "front side X1", and the other side is recorded as "rear side X2". In addition, the front-rear direction X and the width direction Y are sometimes also used to indicate the radial direction of the insertion hole 16a and the micro-operating shaft 30 described later in the drawings. This is just for the convenience of explanation, and does not necessarily coincide with the direction in the actual use state of the micro switch 1, and does not limit the directions in the actual use state of the micro switch 1.

[0033] The housing 10 includes a box portion 11 having a substantially rectangular box shape, and a cover portion 12 provided on an upper side Z1 of the box portion 11. Figure 2 As shown, the box portion 11 has a storage space 13 inside. The storage space 13 stores components such as the switching unit 50 and the contact 60. A protrusion 14 that protrudes toward the rear side X2 is formed on the side wall of the box portion 11 on the rear side X2. The protrusion 14 is a portion for fixing the box portion 11 to a device (such as the above-mentioned pressure switch) equipped with the micro switch 1, and together with the base portion 15 described later, constitutes a connecting portion that connects the box portion 11 to the device. The cover portion 12 includes: a base portion 15, which is arranged on the upper side Z1 of the protrusion 14 and extends to the upper side Z1; and a cover body 16, which is continuous with the base portion 15 and extends in the front-to-back direction X orthogonal to the base portion 15. The base portion 15 is formed in a thick plate shape, and together with the above-mentioned protrusion 14, constitutes a connecting portion that connects the box portion 11 to the device.

[0034] On the surface of the base portion 15 facing the front side X1, a total of two sets of a pair of protrusions 15a are formed in a manner arranged in the width direction Y, and each protrudes toward the front side X1 at a distance in the width direction Y. A rectangular parallelepiped base 17 is formed between the pair of protrusions 15a, which protrudes toward the front side X1 from the surface of the base portion 15 facing the front side X1. A fixing portion 18 fixing a rod 22 described later is fixed to the base 17 by a fastening member 19. The fixing portion 18 is formed by bending a metal plate, etc., covers the surface of the upper side Z1 and both side surfaces in the width direction Y of the base 17, and protrudes toward the front side X1 beyond the end of the front side X1 of the base 17. The cover body 16 is formed in a rectangular plate shape extending in the front-rear direction X and the width direction Y, and a through hole 16a is formed in the central portion thereof and penetrates in the axial direction Z.

[0035] The insertion hole 16a is formed in a circular shape when viewed from the axial direction. Figure 3As shown, in the cover body 16, a first step portion 16b is formed around the opening edge portion of the upper side Z1 of the insertion hole 16a, which is composed of a first transverse surface 16b1 (a wall surface around the insertion hole 16a) extending radially outward of the insertion hole 16a, and a first longitudinal surface 16b2 rising from the first transverse surface 16b1 to the upper side Z1. In addition, a second step portion 16c is formed in the cover body 16, which is continuous with the end of the upper side Z1 of the first step portion 16b and extends radially outward of the insertion hole 16a, and a second longitudinal surface 16c2 rising from the second transverse surface 16c1 to the upper side Z1. A fixing member 70 for fixing the sealing member 40 described later is provided in the portion where the first step portion 16b and the second step portion 16c are formed. The fixing member 70 includes a locking portion 71 rising upward from a wall surface on the upper side Z1 of the cover body 16 and a main body 73 locked and supported by a hole 72 formed in the locking portion 71 and penetrating in the horizontal direction.

[0036] The main body 73 includes a first L-shaped portion 74 extending from a portion engaged with the hole 72 to a wall surface on the upper side Z1 of the cover body 16 and a second step portion 16c. Figure 3 and a second L-shaped portion 75, which is continuous with the first L-shaped portion 74 and extends from the second step portion 16c to the first step portion 16b, in Figure 3 The first L-shaped portion 74 and the second L-shaped portion 75 extend over the entire circumference of the insertion hole 16a. An anti-detachment protrusion 76 protruding toward the lower side Z2 is formed on the end surface of the lower side Z2 of the second L-shaped portion 75. The anti-detachment protrusion 76 is a portion that is pressed along the axial direction Z to fix the flange sealing portion 44 of the sealing member 40 described later to the cover body 16. The anti-detachment protrusion 76 is formed over the entire circumference of the insertion hole 16a.

[0037] The working part 20 is a part that is displaced by an external force, so that the micro-working shaft 30 moves forward and backward in the axial direction. Examples of external force include, when the micro-switch 1 is used as a pressure switch for detecting the pressure of the refrigerant or a temperature switch for detecting the temperature of the refrigerant, a force generated and transmitted when the bellows, which is a sensing component, is displaced according to the pressure and temperature changes of the refrigerant. In this case, the working part 20 functions as a displacement transmission component that transmits the displacement of the bellows, etc. to the micro-working shaft 30. Figure 1 , Figure 2 As shown in FIG. 1 , the working part 20 includes a rotating shaft 21 that penetrates both side walls of the fixing part 18 in the width direction Y and is fixed, and a rod 22 that is rotatably supported on the rotating shaft 21. The rod 22 is provided so as to rotate around the rotating shaft 21 (in this embodiment, from the rotating shaft 21 to the rotating shaft 22) based on the force generated and transmitted by the displacement of the bellows as described above. Figure 2The rod 22 has a plate-like portion 23 extending in the front-rear direction X, and a conical bearing portion 24 protruding toward the upper side Z1 is formed on the plate-like portion 23. The inner peripheral surface of the bearing portion 24 constitutes a sliding contact surface that slides with one end portion 31 of the micro-operating shaft 30 described later.

[0038] The micro-operating shaft 30 is a shaft member that moves forward and backward along the axial direction Z following the rotational movement of the rod 22 in the operating part 20, is inserted into the insertion hole 16a of the cover body 16, is formed to extend along the axial direction Z, and is fixed to the housing 10 in a manner that allows displacement along the axial direction Z. Figure 2 , Figure 3 As shown in FIG. 1 , the micro-operating shaft 30 includes: an end portion 31, which is located outside the housing 10 and constitutes an end portion on the upper side Z1; a fastening groove 32, which is adjacent to the end portion 31; and an engaging portion 33, which is located inside the housing 10 and constitutes an end portion on the lower side Z2. The end portion 31 is a portion that is in sliding contact with the inner peripheral surface of the bearing portion 24 of the rod 22, and its outer surface is formed in a hemispherical shape. The fastening groove 32 is a groove that connects the shaft seal portion 49 of the opening end edge of the mounting hole 48, which constitutes the sealing member 40 and is described later, and is formed to be recessed toward the radial inner side of the micro-operating shaft 30. The bottom of the fastening groove 32 constitutes a small diameter portion 32a that can abut against the shaft seal portion 49. The engaging portion 33 is a portion that engages with the switching unit 50. When the engaging portion 33 engages with the switching unit 50, a force in the axial direction Z (axial direction) acts on the switching unit 50 when the micro-operating shaft 30 moves forward and backward.

[0039] The sealing member 40 is a member that covers the micro-operating shaft 30 around the axis and shields the insertion hole 16a, and is formed of a flexible resin material or the like. Figure 3 As shown, the sealing member 40 includes: a first cylindrical portion 41 which stands up from the first step portion 16b of the housing 10; a second cylindrical portion 42 which is arranged on the upper side Z1 of the first cylindrical portion 41; and a cross portion 43 which extends in a cross direction (in this embodiment, a radial direction (horizontal direction) of the insertion hole 16a and the micro-operating shaft 30) that crosses the axial direction Z. The first cylindrical portion 41 has a central axis coaxial with the micro-operating shaft 30 and is formed in a cylindrical shape extending in the axial direction Z. The inner diameter dimension of the first cylindrical portion 41 is set to be substantially the same as the inner diameter dimension of the insertion hole 16a described above. A flange sealing portion 44 protruding radially outward of the insertion hole 16a is formed at the end portion on the lower side Z2 of the first cylindrical portion 41. The flange sealing portion 44 extends along the first transverse surface 16b1 (the wall surface around the insertion hole 16a) of the first step portion 16b, and is pressed in the axial direction Z (thickness direction) by the anti-detachment protrusion 76 of the fixing member 70 to be tightly fixed to the housing 10.

[0040] The second cylinder 42 has a central axis coaxial with the first cylinder 41 and is formed in a cylindrical shape. The outer diameter of the second cylinder 42 is formed to be smaller than the outer diameter of the first cylinder 41. The intersection 43 includes a first intersection 43a connecting the first cylinder 41 and the second cylinder 42, and a second intersection 43b connecting the second cylinder 42 and the micro-operating shaft 30. That is, at least one intersection 43 is formed in the sealing member 40. The first intersection 43a extends from the end on the upper side Z1 of the first cylinder 41 to the end on the lower side Z2 of the second cylinder 42. A first corner 45 is formed at the connection portion of the first intersection 43a and the first cylinder 41, that is, the intersection portion, which faces the direction away from the micro-operating shaft 30 in the intersection direction. A second corner 46 is formed at the connection portion of the first intersection 43a and the second cylinder 42, that is, the intersection portion, which faces the direction close to the micro-operating shaft 30 in the intersection direction.

[0041] The second intersection portion 43b extends from the end portion on the upper side Z1 of the second cylinder portion 42 to the fastening groove 32 of the micro-acting shaft 30. A third triangular portion 47 is formed at the connection portion between the second intersection portion 43b and the second cylinder portion 42, that is, the intersection portion, which faces the direction away from the micro-acting shaft 30 in the intersection direction. A mounting hole 48 is formed in the central portion of the second intersection portion 43b and penetrates in the axial direction Z, and the micro-acting shaft 30 is inserted into the mounting hole 48. The opening edge of the mounting hole 48 constitutes a shaft sealing portion 49 that is thicker than other portions of the sealing member 40. The shaft sealing portion 49 is a portion connected to the fastening groove 32. When connected, the fastening groove 32 and the shaft sealing portion 49 are in close contact with each other, thereby sealing the close contact portion. Among them, for example, the groove width of the fastening groove 32 can be set to be smaller than the dimension of the shaft sealing portion 49 in the thickness direction. Therefore, when the fastening groove 32 and the shaft seal portion 49 are connected, the shaft seal portion 49 is deformed in the axial direction Z while being embedded in the fastening groove 32. Therefore, the shaft seal portion 49 that is about to return to the state before deformation is in close contact with the inner surface of the fastening groove 32, thereby sealing in the axial direction Z.

[0042] In addition, the outer diameter of the small diameter portion 32a formed by the bottom of the above-mentioned fastening groove 32 can be set larger than the inner diameter of the mounting hole 48 of the sealing member 40. Therefore, when the fastening groove 32 and the shaft seal portion 49 are connected, after the micro-actuating shaft 30 is inserted into the mounting hole 48 in a state where the inner diameter of the mounting hole 48 is enlarged, the opening edge of the mounting hole 48 (i.e., the shaft seal portion 49) that is about to return to the state before the inner diameter is enlarged is in close contact with the outer peripheral surface of the small diameter portion 32a, thereby performing sealing in the radial direction.

[0043] In addition, as for the sealing based on the close contact between the fastening groove 32 and the shaft seal portion 49, as described above, it is also possible to perform sealing only in the axial direction Z by setting the groove width of the fastening groove 32 to be smaller than the dimension in the thickness direction of the shaft seal portion 49, or to perform sealing only in the radial direction by setting the outer diameter dimension of the small diameter portion 32a to be larger than the inner diameter dimension of the mounting hole 48 of the sealing component 40. In addition, it is also possible to perform both axial direction Z and radial direction sealing by setting the groove width of the fastening groove 32 to be smaller than the dimension in the thickness direction of the shaft seal portion 49, and setting the outer diameter dimension of the small diameter portion 32a to be larger than the inner diameter dimension of the mounting hole 48 of the sealing component 40. That is, it is possible to set the groove width of the fastening groove 32 to be smaller than the dimension in the thickness direction of the shaft seal portion 49, and to set the outer diameter dimension of the small diameter portion 32a to be larger than the inner diameter dimension of the mounting hole 48 of the sealing component 40. In this way, the micro-actuating shaft 30 and the sealing member 40 , and the sealing member 40 and the housing 10 are kept in close contact with each other, thereby maintaining the airtightness inside the sealing member 40 .

[0044] In addition, in the present embodiment, for example, it is sometimes necessary to configure the sealing member 40 to have airtightness so that flammable gas does not enter from the outside, and as a specification, the airtightness is set to have airtightness of several 10 kPa from the inside, but the airtightness can be appropriately changed. Figure 1 As shown, a plurality of the working parts 20 and the micro-operating shafts 30 may be provided in one housing 10. In this case, each micro-operating shaft 30 and the insertion hole 16a may be covered individually or collectively by the sealing member 40. In this case, for example, the sealing member 40 may be formed in an oblong shape, an elliptical shape, etc. when viewed from the axial direction.

[0045] like Figure 2As shown, the switching unit 50 includes: a movable piece 51, which is engaged with the engaging portion 33 of the micro-operating shaft 30; a buckle piece 52, which abuts against the front end of the movable piece 51 and applies force to the movable contact 63 described later toward the first fixed contact 61 or the second fixed contact 62; and a conductive piece 53, which includes a movable contact 63 at the end of the front side X1. The contact 60 is a conductive component connected to a plurality of terminals (not shown) provided on the housing 10, and includes a first fixed contact 61, a second fixed contact 62, and a movable contact 63 fixed to the end of the front side X1 of the conductive piece 53. The first fixed contact 61 is fixed to the housing 10 in the storage space 13 and connected to the first terminal (not shown). The second fixed contact 62 is arranged on the upper side Z1 of the first fixed contact 61, and is fixed to the housing 10 in the storage space 13 opposite to the first fixed contact 61 along the axial direction Z. The second fixed contact 62 is connected to the second terminal (not shown). The movable contact 63 is disposed between the first fixed contact 61 and the second fixed contact 62 , and is provided so as to be able to abut against the first fixed contact 61 and the second fixed contact 62 , respectively, so as to be able to switch the conduction target.

[0046] Next, the assembly of the micro-operating shaft 30 will be described. First, the micro-operating shaft 30 is inserted into the micro-operating shaft 30 from the side of the one end portion 31 along the axial direction Z. Figure 4 Then, the shaft seal portion 49 of the seal member 40 is inserted into the fastening groove 32 of the micro-operating shaft 30 to seal the micro-operating shaft 30 and the seal member 40. Next, the seal member 40 is arranged on the housing 10 in such a manner that the flange seal portion 44 of the seal member 40 abuts against the first step portion 16b of the housing 10. At this time, as shown in FIG. Figure 2 As shown, the engaging portion 33 of the micro-operating shaft 30 is engaged with the movable piece 51 of the switching unit 50. Then, the fixing member 70 is set on the housing 10, and the flange sealing portion 44 is pressed by the anti-detachment protrusion 76 of the second L-shaped portion 75 to fix the sealing member 40 tightly to the housing 10. Figure 5 As shown, the sealing member 40 is mounted on the housing 10 and is in the mounted state. Next, the micro-operating shaft 30 is displaced downward by a predetermined amount, so that the one end portion 31 abuts against the bearing portion 24 of the operating portion 20. In this state, as shown in FIG. Figure 6 As shown, the sealing member 40 is in an initial state in which the first intersection portion 43 a is inclined relative to the horizontal direction toward the axial direction Z. Thus, the assembly of the sealing member 40 is completed.

[0047] Next, the operation of the micro switch 1 is described. As an example, the micro switch 1 is mounted on the pressure switch for detecting the pressure of the refrigerant, and switches the conduction target of the contact 60 between a low pressure state where the pressure of the refrigerant is low and a high pressure state where the pressure of the refrigerant is a predetermined amount greater than the low pressure state. Figure 2The micro switch 1 shows a state in which the refrigerant is in a low-pressure state. In this state, the working part 20 does not press the micro working shaft 30 toward the lower side Z2, and the movable contact 63 that applies force toward the lower side Z2 through the snap piece 52 abuts against the first fixed contact 61 and conducts, thereby detecting that it is in a low-pressure state. In this state, the sealing component 40 maintains the shape of the initial state described above. Next, when the pressure of the refrigerant rises, the pressure acts on the bellows of the pressure switch, thereby displacing the bellows, and the displacement is transmitted to the working part 20 via a transmission component not shown, applying an external force toward the lower side Z2 to the working part 20. As a result, the rod 22 of the working part 20 rotates to the left around the rotation axis 21. As a result, the micro working shaft 30 follows the rotation of the rod 22 and displaces toward the lower side Z2.

[0048] When the micro-operating shaft 30 is displaced toward the downward side Z2, the shaft seal portion 49 of the sealing member 40 is pulled toward the downward side Z2. At this time, a downward load is first applied to the second intersection portion 43b. As a result, the second intersection portion 43b is tilted toward the downward side Z2 with the third corner portion 47 as a fulcrum. Next, the above load is applied to the second cylinder portion 42 via the second intersection portion 43b and the third corner portion 47, and the second cylinder portion 42 is displaced toward the downward side Z2. Then, a load is applied to the second corner portion 46 relative to the lower end of the second cylinder portion 42 toward the downward side Z2. As a result, the first intersection portion 43a is deformed. Among them, since the second cylinder portion 42 is configured to have a smaller diameter than the first cylinder portion 41, the first intersection portion 43a is deformed in a manner of tilting toward the downward side Z2 with the first corner portion 45 that is farther away from the radially outer side of the micro-operating shaft 30 than the second corner portion 46 as a fulcrum. And, along with the deformation of the first intersection portion 43a, the first cylinder portion 41 is deformed to tilt toward the radially outer side of the micro-operating shaft 30 with the boundary with the flange seal portion 44 as a fulcrum. Thus, the sealing member 40 becomes Figure 7 Shown is maximum compression.

[0049] Next, due to the displacement of the micro-operating shaft 30 toward the lower side Z2, a load toward the lower side Z2 acts on the switching unit 50, the movable piece 51 is deformed, and the snap piece 52 is deformed in conjunction with the deformation of the movable piece 51. When the deformation amount of the snap piece 52 exceeds a constant amount, the force acting on the conductive piece 53 is reversed, and the conductive piece 53 is forced toward the upper side Z1, thereby releasing the conductive state between the movable contact 63 and the first fixed contact 61, and the movable contact 63 and the second fixed contact 62 are brought into contact and conductive. That is, the conductive target of the contact 60 is switched by the switching unit 50. As a result, it is detected that the micro switch 1 is switched from the low-voltage state to the high-voltage state.

[0050] Furthermore, in this embodiment, Figure 2 The micro switch 1 is shown when the refrigerant is in a low pressure state, but the opposite is also possible. Figure 2 FIG. 1 shows the micro switch 1 when the refrigerant is in a high pressure state. Figure 2In the state shown, the high pressure state is detected. In addition, when the pressure of the refrigerant drops from this state, the bellows is displaced, and the displacement is transmitted to the working part 20, the micro-working shaft 30 is displaced to the lower side Z2, the force of the snap piece 52 is reversed, the conductive state between the movable contact 63 and the first fixed contact 61 is released, and the movable contact 63 is conductive with the second fixed contact 62, and it is detected that the micro switch 1 is switched from the high pressure state to the low pressure state.

[0051] In addition, in this embodiment, the operation of the micro switch 1 is described as a case where the micro switch 1 is mounted on a pressure switch for detecting the pressure of the refrigerant, but this is merely illustrative, and for example, the micro switch 1 is mounted on a temperature switch for detecting the temperature of the refrigerant, and the conduction target of the contact 60 is switched between a low temperature state where the temperature of the refrigerant is low and a high temperature state where the temperature of the refrigerant is higher than the low temperature state by a predetermined amount. In this case, for example, Figure 2 The state is set as the state where the refrigerant is in a low-temperature state. When the temperature of the refrigerant rises from this point, the bellows expands and displaces, and the displacement is transmitted to the working part 20 via a transmission component not shown, and an external force toward the lower side Z2 is applied to the working part 20. As a result, the sealing component 40 is displaced and the micro-working shaft 30 is displaced toward the lower side Z2, as in the case of the pressure switch, and the load generated by the displacement acts on the switching unit 50, and the force based on the snap-on piece 52 is reversed, and the conductive state between the movable contact 63 and the first fixed contact 61 is released, and the movable contact 63 and the second fixed contact 62 are conductive. As a result, it is detected that the micro switch 1 is switched from the low-temperature state to the high-temperature state.

[0052] As described above, according to the above-mentioned embodiment, when the micro-acting shaft 30 is displaced from the upper side Z1 (one side) to the lower side Z2 (the other side) in the housing 10 (casing), first, a load is applied to the second cylindrical portion 42 of the sealing member 40 connected to the micro-acting shaft 30 in the displacement direction of the micro-acting shaft 30, and then the load is transmitted to the second corner portion 46 which is the connection portion between the second cylindrical portion 42 and the first intersection portion 43a (intersection portion 43). The first intersection portion 43a is deformed by the transmission of the load. Since the second cylindrical portion 42 is configured to have a smaller diameter than the first cylindrical portion 41, the first intersection portion 43a is deformed in a manner inclined in the displacement direction of the micro-acting shaft 30 with the first corner portion 45 which is farther from the micro-acting shaft 30 in the intersection direction than the second corner portion 46 as a fulcrum. In addition, along with this deformation, the first cylindrical portion 41 is deformed in a manner inclined toward the radial outer side of the micro-acting shaft 30 with the boundary with the flange seal portion 44 as a fulcrum.

[0053] Thus, the main deformation of the sealing member 40 is deformation such that the second intersection portion 43b is tilted with the third corner portion 47 as a fulcrum, the first intersection portion 43a is tilted with the first corner portion 45 as a fulcrum, and the first tube portion 41 is tilted with the boundary with the flange seal portion 44 as a fulcrum, and the directions of the first corner portion 45 in the direction away from the micro-actuating shaft 30 and the second corner portion 46 in the direction close to the micro-actuating shaft 30 in the intersection direction are not reversed. That is, it is possible to suppress the deformation of the sealing member 40 accompanying the mode change, such as the deformation of the dome-shaped rubber cap of the conventional micro switch described above. Therefore, for example, when a tangent line is drawn on the curve along the wall surface of the sealing member 40, it is possible to prevent the direction of the tangent line toward the micro-actuating shaft 30 from reversing from upward to downward, or from downward to upward. As a result, the rigidity of the sealing member 40 can be stabilized, so that the deformation amount of the sealing member with respect to a predetermined force can be made to be a target deformation amount, and the action of the micro-actuating shaft 30 can be made to be a target action. Therefore, it is possible to provide the micro switch 1 having the sealing structure that stably maintains the operation of the micro operating shaft 30 and appropriately suppresses the intrusion of foreign matter.

[0054] In addition, when the sealing member 40 is deformed in accordance with the displacement of the micro-operating shaft 30, the second intersection portion 43b can be tilted with the third corner portion 47 as a fulcrum, and the first intersection portion 43a can be tilted with the first corner portion 45 as a fulcrum, so that the deformed portion can be dispersed in a plurality of portions. Therefore, the deformation of the sealing member 40 caused by the above-mentioned mode change can be suppressed, and the deformation amount of the sealing member 40 with respect to the predetermined force and the movement of the micro-operating shaft 30 can be made to be the target deformation amount and movement.

[0055] In addition, the sealing member 40 can also be formed in a manner to cover a plurality of micro-operating shafts 30, so the structure of the sealing member 40 of the present invention can also be applied to the so-called double-type micro switch 1 having a plurality of switches in the housing 10. In addition, the sealing member 40 can be formed so as to cover a plurality of micro-operating shafts 30 at once, or a plurality of sealing members 40 can be provided to cover a plurality of micro-operating shafts 30 respectively. In this case, the anti-detachment protrusion 76 of the fixing member 70 can press a plurality of sealing members 40 at once, and a plurality of sealing members 40 can be closely fixed to the cover body 16 by a single fixing member 70. According to this structure, the number of parts of the fixing member 70 can be reduced, and the fixing member 70 can be miniaturized.

[0056] In addition, by providing the fixing member 70, the sealing member 40 can be reliably and closely fixed to the housing 10 by the fixing member 70 while pressing the flange sealing portion 44, and the sealing performance of the sealing member 40 can be stably maintained. In addition, it is also possible to omit the fixing member 70 and press the opening edge of the first cylinder portion 41 of the sealing member 40 into the first step portion 16b. However, in this case, there is also a possibility that the sealing member 40 does not sufficiently seal the storage space 13, so it is preferred to use the fixing member 70.

[0057] Furthermore, according to the above-described embodiment, a switch device such as a pressure switch or a temperature switch can be configured using the micro switch 1 including the sealing member 40 that stably maintains the operation of the micro operating shaft 30 and appropriately suppresses the intrusion of foreign matter.

[0058] In addition, the above-described embodiments are merely representative embodiments of the present invention, and the present invention is not limited thereto. That is, various deformations can be made to implement the present invention 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 present embodiment, the second barrel 42 of the sealing component 40 is connected to the micro-working shaft 30 via the third corner 47 and the second intersection 43b, but it can also be omitted, and the second barrel 42 can be directly connected to the micro-working shaft 30. That is, the sealing component 40 can also be composed of the first barrel 41, the first intersection 43a, the first corner 45, the second barrel 42 and the second corner 46. In addition, on the contrary, the intersection 43 can be further increased and the corner can be newly provided.

Claims

1. A micro switch, characterized in that: have: case; an operating shaft inserted into an insertion hole formed through the housing and displaced in an axial direction; and a cylindrical sealing member which surrounds the working shaft and covers the insertion hole, The sealing component comprises: a first cylindrical portion, which stands from the housing to one side of the axial direction; a second cylindrical portion, which has a central axis coaxial with the first cylindrical portion and an outer diameter smaller than the outer diameter of the first cylindrical portion, and is arranged on one side of the axial direction of the first cylindrical portion and connected to the working shaft; and at least one intersecting portion, which extends in an intersecting direction intersecting the axial direction. At least one of the intersections constitutes a first intersection connecting the first barrel portion and the second barrel portion, A first corner portion is formed at an intersection of the first cylindrical portion and the first intersection portion, facing in a direction away from the working axis in the intersection direction. A second corner portion facing in a direction approaching the operating axis in the intersecting direction is formed at an intersecting portion of the second cylindrical portion and the first intersecting portion.

2. The micro switch according to claim 1, characterized in that: In addition to the first intersection portion, the intersection portion further includes a second intersection portion connecting the second cylinder portion and the operating shaft. A third triangular portion is formed at an intersection of the second intersection portion and the second cylindrical portion and faces in a direction away from the operating axis in the intersection direction.

3. The micro switch according to claim 1, characterized in that: There are multiple working axes. The sealing component is configured to cover the plurality of working shafts collectively.

4. The micro switch according to claim 1, characterized in that: The first cylinder portion is provided with a flange seal portion, the flange seal portion being along a wall surface around the insertion hole of the housing. A fixing member is further provided for pressing the flange seal portion in the thickness direction to fix it to the housing.

5. A switch device, characterized in that: The micro switch according to any one of claims 1 to 4 is mounted thereon.

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