Pressure follow-up switch

Abstract

The purpose of the present invention is to provide a pressure follow-up switch in which wiring of an electric wire can be easily performed. A pressure follow-up switch (1) is provided with: a microswitch (A) provided with a lever (47); a terminal (60) that is connected to a contact that switches the conduction state in accordance with the displacement of the lever (47); and a housing (10) that houses the microswitch (A). The housing (10) is provided with a cover (15), a rear wall (13), a top wall (12), and a bottom wall (14). The rod (47) is arranged on the rear side (X1) in the housing (10). The terminal (60) is provided with a wiring part (a) to which the electric wire (70) is connected, and the wiring part (a) is disposed on the front side (X2) inside the housing (10). A cutout section (17) that opens in the vertical direction (Z) is formed on the end edge of the front side (X2) of the bottom wall (14), and the cutout section (17) and the wiring section (a) face each other in the vertical direction (Z).

Description

Technical Field

[0001] The invention relates to a pressure follow-up switch. Background Art

[0002] In the past, a pressure follower switch for detecting a pressure change of a refrigerant in a refrigeration cycle is known (for example, see Patent Document 1). The pressure follower switch described in Patent Document 1 includes a box-shaped support housing and a mechanical switch housed inside the support housing. The mechanical switch includes a terminal. A lower side plate formed in a plate shape is provided on the bottom surface of the support housing, and a circular hole penetrating in the plate thickness direction is formed in the center of the lower side plate. The wire connected to the terminal in the support housing is led out to the outside of the support housing through the hole of the lower side plate.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 10-334780 Summary of the invention

[0006] Problems to be solved by the invention

[0007] However, in the above-mentioned pressure follower switch, since it is necessary to ensure the working space of the rod (switch rod) installed on the mechanical switch, when the side of the mechanical switch provided with the rod is set as the rear side (back side) of the mechanical switch, the position of the terminal has to be arranged on the front side (front side) of the mechanical switch. Therefore, the connection part between the terminal and the wire is located on the front side of the lower side plate when the pressure follower switch is viewed from above. Due to the constraints of such a configuration, the connection part between the terminal and the wire and the hole of the lower side plate are staggered front and back, so when the wire is wired, the wire is easily interfered with other structures. Therefore, it is difficult to guide the wire to the outside, and the wiring of the wire becomes difficult.

[0008] An object of the present invention is to provide a pressure follower switch that can easily carry out wiring of electric wires.

[0009] Means for solving problems

[0010] In order to solve the above-mentioned problems and achieve the purpose, the pressure follower switch of the present invention comprises: a microswitch comprising a follower component which is displaced according to an external force; a terminal which is arranged on the microswitch and is connected to a contact which switches a conductive state as the follower component is displaced; and a shell which accommodates the microswitch. The pressure follower switch is characterized in that the shell comprises a front wall and a rear wall which are opposite to each other in the front-to-back direction, and a top wall and a bottom wall which are opposite to each other in the up-down direction which is orthogonal to the front-to-back direction, the follower component is arranged on one side of the front-to-back direction in the shell, the terminal comprises a wiring portion for connecting an electric wire, the wiring portion is arranged on the other side of the front-to-back direction in the shell, and a cutout portion which is open in the up-down direction is formed at the end edge of the bottom wall on the other side of the front-to-back direction, and the cutout portion and the wiring portion are opposite to each other in the up-down direction.

[0011] According to the present invention, the connection portion of the terminal and the cutout portion of the bottom wall of the housing are opposed to each other in the vertical direction, so that the position of the connection portion can be made consistent with the position of the cutout portion when the housing is viewed from above. Therefore, when wiring the wires, it is not necessary to bend the wires to avoid interference with other structures, and the wires can be easily led out from the inside of the housing to the outside by pulling the wires out in the vertical direction. Therefore, it is possible to provide a pressure-operated switch that can easily route the wires.

[0012] In addition, at this time, it is preferred that the terminal is provided in plurality on the micro switch, the wiring portion is arranged in plurality in the left-right direction orthogonal to the up-down direction, and the dimension of the cutout portion in the left-right direction is set larger than the dimension in the left-right direction from the end of the plurality of wiring portions on one side in the left-right direction to the end of the plurality of wiring portions on the other side in the left-right direction. According to such a structure, the dimension in the left-right direction of the cutout portion is larger than the dimension in the left-right direction from the end of the plurality of wiring portions on one side in the left-right direction to the end of the plurality of wiring portions on the other side in the left-right direction, so that even when the micro switch is provided with a plurality of terminals and the wiring portions are arranged in the left-right direction, the above-mentioned interference can be avoided and the wires can be easily routed.

[0013] In addition, it is preferred that the cutout portion is formed into a rectangular shape when the housing is viewed from above. According to such a structure, by forming the cutout portion into a rectangular shape when the housing is viewed from above, the left-right dimension of the opening portion for guiding the electric wire to the outside is less likely to change in the front-back direction compared to a conventional circular hole (i.e., an arc having the same radius). Therefore, even if the position of the wiring portion is slightly offset in the front-back direction due to tolerance, etc., it is possible to suppress the position of the wiring portion from being offset from the position of the cutout portion when the housing is viewed from above.

[0014] In addition, it is preferred that the micro switch is provided with a plurality of terminals, and the wiring parts are arranged in a plurality in a staggered manner in the up-down direction and the front-back direction. According to such a structure, even if the micro switch is provided with a plurality of terminals, the wiring parts are arranged in a staggered manner in the up-down direction Z and the front-back direction X, so that the wires respectively connected to the wiring parts can be prevented from overlapping and interfering with each other in the up-down direction and the front-back direction. As a result, the wiring of the wires can be performed more easily.

[0015] Effects of the Invention

[0016] According to the present invention, it is possible to provide a pressure follower switch that can easily route electric wires. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of a pressure follower switch according to one embodiment of the present invention.

[0018] Figure 2 This is the front view of the pressure follower switch with the cover removed.

[0019] Figure 3 This is a perspective view of switch parts housed in a housing of a pressure follower switch.

[0020] Figure 4 This is a perspective view of the switch parts as seen from the terminal block side.

[0021] Figure 5 This is a bottom view of the pressure follower switch.

[0022] Figure 6 yes Figure 5 Section view along line AA.

[0023] Explanation of symbols

[0024] X: front-to-back direction; Z: up-down direction; A: micro switch; a: wiring part; 1: pressure follower switch; 10: housing; 12: top wall; 13: rear wall; 14: bottom wall; 15: cover (front wall); 17: cutout; 47: rod (follower component); 60: terminal; 70: wire. DETAILED DESCRIPTION

[0025] The following is based on Figure 1 to Figure 6The embodiment of the present invention is described. In the following description, the direction in which the surface and the back of the housing 10 described later are opposite to each other is set as the "front-back direction X", one side of the front-back direction X is recorded as the "rear side X1", and the other side is recorded as the "front side X2". In addition, the width direction of the housing 10 is recorded as the "left-right direction Y", one side of the left-right direction Y is recorded as the "left side Y1", and the other side is recorded as the "right side Y2". In addition, the height direction of the housing 10 is recorded as the "upper-lower direction Z", one side of the upper-lower direction Z is recorded as the "upper side Z1", and the other side is recorded as the "lower side Z2". In addition, these definitions are only for the convenience of explanation, and are not necessarily consistent with the front-back direction, left-right direction, and upper-lower direction in the actual use state of the pressure follower switch 1, and do not limit the directions in the actual use state of the pressure follower switch 1.

[0026] The pressure follower switch 1 of the present embodiment is used as a switch for detecting changes in the pressure of the refrigerant in the compressor of the refrigeration cycle, changes in the temperature of a fluid such as the refrigerant, etc. Figure 1 As shown, the pressure follower switch 1 includes a housing 10 that is generally rectangular in shape. The housing 10 is configured to include a C-shaped main frame 11 that opens at the front side X2 and a cover 15 (front wall) that closes the opening of the main frame 11, and various components such as a micro switch A described later are stored inside. The main frame 11 is formed by bending a metal plate, etc., and includes a top wall 12, a rear wall 13, and a bottom wall 14. The top wall 12 is formed in a rectangular plate shape extending in the front-to-back direction X and the left-to-right direction Y. The rear wall 13 is formed in a rectangular plate shape, extending from the end edge of the rear side X1 of the top wall 12 to the lower side Z2. The bottom wall 14 is formed in a rectangular plate shape, extending from the lower end edge of the rear wall 13 to the front side X2, and facing the top wall 12 in the up-down direction Z. The cover 15 is formed in a rectangular plate shape, closing the opening of the main frame 11, and facing the rear wall 13 in the front-to-back direction X. A pair of left and right windows 16 penetrating in the front-rear direction X are formed on the plate surface of the cover 15 , and the interior of the housing 10 can be observed through the windows 16 .

[0027] A pair of elements 20 and a pair of joint pipes 21 connected to the pair of elements 20 are connected to the bottom wall 14 of the housing 10. The element 20 has a sensing component such as a bellows or a diaphragm (not shown) inside. The sensing component deforms or displaces in the vertical direction Z according to the pressure change of the pressure fluid introduced through the joint pipe 21. Figure 2As shown, a pair of left and right transmission mechanisms 30 and a pair of left and right switch parts 40 are accommodated inside the housing 10. The transmission mechanism 30 includes a reinforcing plate 31 formed into a C-shape with an opening at the rear side X1 by bending a metal plate, and a transmission member 32 is accommodated inside the reinforcing plate 31. An example of the transmission member 32 is a working plate 32a, which receives the force of deformation or displacement of the above-mentioned sensing member as an external force, rotates around the rotation axis 33, thereby converting the external force into a working force, and transmitting the working force to the rod 47 (following member) described later.

[0028] The switch component 40 is configured to have a plurality of contacts (not shown) inside, and the conduction state of the contacts changes when the above-mentioned working force is applied. A pair of switch components 40 are disposed adjacent to each other in the left-right direction Y to form a double-type micro switch A. Figure 3 As shown, the switch component 40 includes a box portion 41. The box portion 41 is formed into a roughly cubic shape by a material such as resin. A connecting portion 43 protruding toward the lower side Z2 is formed on the lower wall 42 of the box portion 41. The connecting portion 43 is formed in a plate shape extending in the front-rear direction X and the left-right direction Y, and is fixed to the bottom wall 14 of the above-mentioned housing 10. A rectangular box-shaped fixing component 45 is installed on the rear surface portion 44 of the box portion 41. A rotating shaft 46 extending in the left-right direction Y is fixed to the side wall of the fixing component 45, and a rod 47 (following component) is installed on the rotating shaft 46 in a manner that can rotate around the axis. That is, the rod 47 is arranged on the rear side X1 in the housing 10.

[0029] The rod 47 is formed in a plate shape and extends from the rotating shaft 46 to the upper side Z1, and is inclined in a manner that it is located at the rear side X1 as it moves from the lower end supported by the rotating shaft 46 toward the upper end. The rod 47 rotates around the rotating shaft 46 by receiving the above-mentioned working force. That is, it is displaced around the rotating shaft 46 in response to the above-mentioned external force. The rotational motion of the rod 47 is transmitted to the micro-motion shaft not shown in the figure, and is converted into an advance and retreat motion in the front-to-back direction X. In addition, the micro-motion shaft performs the advance and retreat motion, and the switching unit not shown in the figure provided in the box portion 41 is actuated, and the conduction destination of multiple contacts is switched by the switching unit. That is, the conduction destination of the contacts is switched along with the displacement of the rod 47.

[0030] like Figure 4As shown, a terminal block 50 is formed on the front side X2 portion of the box portion 41. The terminal block 50 is a portion where the terminal 60 is set and fixed. In the present embodiment, a total of six terminals are formed, including three upper terminal blocks 50a arranged in the left-right direction Y and three lower terminal blocks 50b adjacent to the lower side Z2 of the upper terminal block 50a and arranged in the left-right direction Y at a position closer to the rear side X1 than the upper terminal block 50a. The upper terminal block 50a includes: an upper setting surface 51 in a rectangular shape in a top view, which extends along the front surface 48 of the box portion 41; an upper wall rib 52, which extends from the edge of the upper side Z1 of the upper setting surface 51 to the front side X2; a pair of upper side wall ribs 53, which extend from the left side Y1 and the right side Y2 of the upper setting surface 51 to the front side X2; and an upper insertion hole 54, which penetrates the upper setting surface 51 and communicates with the inside of the box portion 41. The lower terminal block 50b comprises: a lower setting surface portion 55 of a rectangular shape when viewed from above, which extends along the front surface portion 48 of the box portion 41 at a position closer to the lower side Z2 and the rear side X1 than the upper setting surface portion 51; a connecting surface 56, which extends from the edge of the upper side Z1 of the lower setting surface portion 55 to the front side X2 and is connected to the upper setting surface portion 51 and faces the lower side Z2; a pair of lower side wall ribs 57, which extend from the left side Y1 and the right side Y2 of the lower setting surface portion 55 to the front side X2; and a lower insertion hole 58, which passes through the lower setting surface portion 55 and is connected to the inside of the box portion 41.

[0031] In this way, the terminal block 50 is located on the front side X2 in the shell 10, and is formed into a step-like shape with staggered positions in the up-down direction Z and the front-to-back direction X by the upper terminal block 50a and the lower terminal block 50b, and a plurality of terminals are arranged in the left-right direction Y. In addition, terminals 60 are inserted into the upper insertion hole 54 and the lower insertion hole 58. The terminal 60 is a component that is connected one-to-one with respect to the above-mentioned contacts, and is formed into a plate shape using a conductive material, and a plurality of terminals 60 are respectively fixed to the terminal block 50. The terminal 60 comprises: a main body 61, which is inserted into the upper insertion hole 54 or the lower insertion hole 58 and extends in the front-to-back direction X; and a connecting portion 62, which is continuous with the main body 61, is bent in the left-right direction Y and is fixed to the upper setting surface portion 51 or the lower setting surface portion 55. An internal thread portion 63 that passes through the plate thickness direction is formed in the central portion of the connecting portion 62. As Figure 5 As shown, the fastening member 64 is screwed with the internal thread portion 63, and the contact portion 73 of the wire 70 described later is connected and fixed to the connecting portion 62 of the terminal 60 via the fastening member 64. In this embodiment, the portion of the connecting portion 62 that contacts the contact portion 73 of the wire 70 is set as the connecting portion a.

[0032] The connection portion 62 is respectively provided on either the upper terminal block 50a or the lower terminal block 50b. Therefore, in this embodiment, the connection portion a is composed of an upper connection portion a1 provided on the upper terminal block 50a side and a lower connection portion a2 provided on the lower terminal block 50b side. Figure 5 , Figure 6 As shown, the upper connecting portion a1 and the lower connecting portion a2 are arranged on the front side X2 (the other side in the front-to-back direction) in the shell 10, and a plurality of them are arranged in the left-right direction Y. The position of the lower connecting portion a2 is arranged in a stepped manner relative to the position of the upper connecting portion a1, which is staggered toward the lower side Z2 and the rear side X1.

[0033] like Figure 6 As shown, the electric wire 70 includes an electric wire portion 71 composed of a core wire and a coating layer, and a terminal portion 72 provided at the end of the electric wire portion 71. A plate-shaped contact portion 73 is formed at the distal end of the terminal portion 72. The electric wire portion 71 of the electric wire 70 connected to the terminal 60 passes through a cutout portion 17 formed in the bottom wall 14 of the housing 10 and is led out to the outside. The cutout portion 17 is a portion for leading the electric wire 70 connected and fixed to the wiring portion a from the inside of the housing 10 to the outside, and is formed at the end edge of the front side X2 of the bottom wall 14 of the housing 10. As shown in FIG. Figure 5 As shown, the cutout portion 17 includes a first edge 17a extending along the left-right direction Y and a second edge 17b extending from the left and right ends of the first edge 17a toward the front side X2. When viewed from above from the shell 10, it is formed into a roughly rectangular shape and is open to the front side X2 and the up-down direction Z.

[0034] In the cutout portion 17, a dimension S1 from the second edge portion 17b on one side to the second edge portion 17b on the other side (hereinafter referred to as the dimension S1 of the cutout portion 17 in the left-right direction Y) is set larger than a dimension S2 in the left-right direction Y from the left end portion (the end portion on one side in the left-right direction Y) to the right end portion (the end portion on the other side in the left-right direction Y) of the plurality of connecting portions a. Figure 6 As shown, the position of the first edge 17a is substantially consistent with the position of the upper surface of the lower setting surface 55 of the lower terminal block 50b in the vertical direction Z, and thus the depth dimension S3 (the dimension in the front-to-back direction X) of the cutout 17 is substantially the same as the sum S4 of the dimensions of the upper wall rib 52 of the upper terminal block 50a and the connecting surface 56 of the lower terminal block 50b in the front-to-back direction X. In addition, this is only an example, and the position of the first edge 17a may be set to be closer to the rear side X1 than the connecting surface 56, so that the depth dimension S3 of the cutout 17 is larger than that in the present embodiment.

[0035] Through such a structure, Figure 6 As shown, the cutout portion 17 and the connecting portion a are opposed to each other in the vertical direction Z, and the positions of the connecting portion a and the cutout portion 17 coincide with each other in the vertical direction Z. Therefore, when wiring the electric wire 70, the electric wire portion 71 is pulled out from the connecting portion a to the lower side Z2 without being bent, so that the electric wire 70 is led out from the inside of the housing 10 to the outside.

[0036] As described above, according to the above-mentioned embodiment, the connection portion a of the terminal 60 and the cutout portion 17 of the bottom wall 14 of the housing 10 are opposed to each other in the vertical direction Z, so that the position of the connection portion a can be made consistent with the position of the cutout portion 17 when the housing 10 is viewed from above. Therefore, when wiring the electric wire 70, it is not necessary to bend the electric wire 70 to avoid interference with other structures, and the electric wire portion 71 can be easily led out from the inside of the housing 10 to the outside by pulling the electric wire 70 out in the vertical direction Z. Therefore, it is possible to provide a pressure follower switch 1 that can easily wire the electric wire 70.

[0037] In addition, according to the above structure, the dimension S1 of the cutout portion 17 in the left-right direction Y is larger than the dimension S2 in the left-right direction Y from the left end portion (the end on one side of the left-right direction Y) to the right end portion (the end on the other side of the left-right direction Y) of the plurality of wiring portions a. Therefore, even when the microswitch A is provided with a plurality of terminals 60 and the wiring portions a are arranged along the left-right direction Y, the above-mentioned interference can be avoided and the wires 70 can be easily routed.

[0038] In addition, according to the above-mentioned structure, by forming the cutout portion 17 into a rectangular shape when viewed from above the housing 10, the dimension of the opening portion in the left-right direction Y for guiding the electric wire 70 to the outside is less likely to change in the front-back direction X compared to a conventional circular hole. Therefore, even if the position of the connecting portion a is slightly offset in the front-back direction X due to tolerance, etc., the position of the connecting portion a and the position of the cutout portion 17 can be suppressed from being offset when viewed from above the housing 10.

[0039] Furthermore, according to the above embodiment, even if a plurality of terminals 60 are provided in the micro switch A, the connecting portion a is arranged in a step-like shape with positions shifted in the vertical direction Z and the front-rear direction X, so that the wires 70 respectively connected to the connecting portion a can be prevented from overlapping and interfering with each other in the vertical direction Z and the front-rear direction X. Thus, the wiring of the wires 70 can be performed more easily.

[0040] 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 without departing from the main purpose of the present invention. Through this deformation, as long as the structure of the pressure follower switch 1 of the present invention is possessed, it is of course also included in the scope of the present invention. For example, in the present embodiment, the cutout portion 17 is formed in a rectangular shape, but the shape of the cutout portion 17 is not necessarily rectangular, and the cutout portion 17 can be formed in various shapes such as circular, oblong, and elliptical. In addition, the number and configuration of the above-mentioned terminal block 50, terminal 60, and wiring portion a are merely examples, and their number can be appropriately changed. That is, the wiring portion a does not have to be arranged in a plurality in the left-right direction Y, and can also be arranged in a plurality in a staggered manner in the up-down direction Z and the front-back direction X.

[0041] In addition, in the pressure follower switch 1 of the present embodiment, the use as a pressure switch is mainly described, but the pressure follower switch 1 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 a fluid (here, a refrigerant circulating in a refrigeration cycle) to be detected is introduced through the joint pipe 21 and the pressure of the detected object is directly applied to a sensing component such as a bellows or a diaphragm to detect a pressure change, but the use of the pressure follower switch 1 is not limited to this. That is, the temperature sensing tube is connected to the element 20 in the pressure follower switch 1 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. In this way, in the temperature switch using the pressure follower switch 1 of the present embodiment, the sensing component is deformed or displaced in the vertical direction Z according to the pressure inside the closed space that changes according to the temperature change detected by the temperature sensing tube, and the conductive state of the contact is changed by transmitting the force at this time to the rod 47 (the following component).

Claims

1. A pressure follower switch, comprising: a micro switch having a follower member that is displaced according to an external force; a terminal that is provided on the micro switch and is connected to a contact that switches a conductive state according to the displacement of the follower member; and a housing that accommodates the micro switch. The pressure follower switch is characterized in that: The housing includes a front wall and a rear wall facing each other in a front-rear direction, and a top wall and a bottom wall facing each other in a top-bottom direction orthogonal to the front-rear direction. The follower member is arranged in the housing at one side in the front-rear direction. The terminal has a connection portion for connecting an electric wire. The connection portion is arranged in the housing at the other side in the front-rear direction. A cutout portion opening in the up-down direction is formed at the end edge of the other side in the front-back direction of the bottom wall. The cutout portion and the connecting portion are opposed to each other in the up-down direction.

2. The pressure follower switch according to claim 1, characterized in that: The terminal is provided in plurality on the micro switch, The connecting parts are arranged in a plurality in a left-right direction orthogonal to the up-down direction. The dimension of the cutout portion in the left-right direction is set to be larger than the dimension of the plurality of connecting portions from the end portion on one side in the left-right direction to the end portion on the other side in the left-right direction.

3. The pressure follower switch according to claim 2, characterized in that: The cutout portion is formed in a rectangular shape when the housing is viewed from below.

4. The pressure follower switch according to any one of claims 1 to 3, characterized in that: The terminal is provided in plurality on the micro switch, A plurality of the connecting portions are arranged in a stepped manner with positions being staggered in the up-down direction and the front-rear direction.

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