JPWO2019180931A1 - Electromagnetic contactor - Google Patents

Abstract

The electromagnetic contactor (1) is provided with a fixed contactor (40) provided with a fixed contact (40a) and a movable contact (30a), and the movable contact (30a) can be brought into contact with or not contacted with the fixed contact (40a). A movable contactor (30), and a housing having an exhaust passage (P) for exhausting hot gas generated when the movable contact (30a) and the fixed contact (40a) are opened to the outside. The casing is composed of the arc cover (11) and the grid case (80), and the hot gas is discharged to the exhaust passage P on the movable contact (30a) side in the contact direction of the movable contact (30a) and the fixed contact (40a). The hot gas introduced into the exhaust passage P is exhausted to the outside on the fixed contact (40a) side in the contact direction of the movable contact (30a) and the fixed contact (40a) while introducing the introduction ports (81b to 81d). It has an exhaust port (13) for

Description

  The present invention relates to an electromagnetic contactor including an exhaust passage that cools hot gas generated when a contact between a movable contact and a fixed contact is opened and exhausts the hot gas to the outside of the device.

  Conventionally, as this type of device, the electromagnetic contactor described in Patent Document 1 is known. This device has a fixed contact provided with a fixed contact inside the arc extinguishing chamber, a movable contact provided with a movable contact, and the movable contact capable of contacting and non-contacting with the fixed contact, and a plurality of arc extinguishing grids. A group of arc-extinguishing grids that are spaced apart from each other and arranged in the horizontal direction, and further include an exhaust passage that is disposed above the fixed contact and the movable contact and extends in the horizontal direction. Specifically, the exhaust passage is disposed above the arc extinguishing grid group of the fixed contact and the movable contact, is located on the lower side close to the two contactors, and extends in the horizontal direction. A second guide wall that is arranged above the arc extinguishing grid group of the contacts and that is farther from these contacts and extends in the horizontal direction, and a first guide wall that is provided at an end of the first guide wall on the fixed contact side. It is configured to have an opening and a second opening provided at an end of the second guide wall on the side of the movable contact.

  In the device configured as described above, when hot gas is generated between the movable contact and the fixed contact when the contacts are opened, the generated hot gas passes through the arc extinguishing grids forming the arc extinguishing grid group. And is introduced into the exhaust passage through the first opening provided at the fixed contact side end of the first guide wall, passes through the exhaust passage, and is provided at the movable contact side end of the second guide wall. The gas is exhausted from the opening to the outside of the device. Since the hot gas is cooled when it passes through the exhaust passage and its temperature becomes low, the volume thereof becomes small, and the amount of exhaust of the hot gas to the outside of the device can be reduced.

Japanese Patent Laid-Open No. 02-090422

  However, in the above-mentioned conventional technique, as described above, the first opening is provided at the fixed contact side end of the first guide wall, and the first opening is located at the position where hot gas generated when the contact opens. It has a close structure. Therefore, the length of the exhaust path inside the arc-extinguishing chamber traced by the hot gas from the fixed contact, which is the hot gas generation point, to the first opening is short, and the hot gas cannot be sufficiently cooled. There is a possibility that the amount of hot gas exhausted outside the device cannot be sufficiently suppressed.

  The present invention has been made in view of the above, and an object of the present invention is to provide an electromagnetic contactor capable of further suppressing the exhaust amount of hot gas to the outside of the device.

  In order to solve the above-mentioned problems and to achieve the object, in the electromagnetic contactor according to claim 1, a fixed contact provided with a fixed contact and a movable contact are provided so that the movable contact comes into contact with the fixed contact. The housing includes a movable contactor capable of contacting and a casing having an exhaust passage for discharging hot gas generated when the contact between the movable contact and the fixed contact is opened, and the casing has the movable contact and the fixed contact in contact with each other. Further, in the contact direction which is the non-contact direction, the movable contact side is provided with an introduction port for introducing hot gas into the exhaust passage.

  The electromagnetic contactor according to the present invention has the inlet for introducing the hot gas into the exhaust passage on the movable contact side, so that the exhaust path of the hot gas becomes longer and the cooling effect until the hot gas is exhausted can be improved. Therefore, the amount of hot gas discharged to the outside of the apparatus can be suppressed.

1 is a perspective view showing an overall external structure of a first embodiment of an electromagnetic contactor according to the present invention. It is a perspective view showing the perspective structure about the contact part which constitutes Embodiment 1 of the electromagnetic contactor concerning the present invention. It is a perspective view which shows the internal structure about the arc-extinguishing chamber which comprises Embodiment 1 of the electromagnetic contactor which concerns on this invention. It is sectional drawing which shows the internal structure about the arc-extinguishing chamber which comprises Embodiment 1 of the electromagnetic contactor which concerns on this invention. It is a perspective view which shows the structure about the grid case which comprises Embodiment 1 of the electromagnetic contactor which concerns on this invention. It is sectional drawing for demonstrating operation | movement about Embodiment 1 of the electromagnetic contactor which concerns on this invention. It is a perspective view which shows the structure about the grid case which comprises Embodiment 2 of the electromagnetic contactor which concerns on this invention.

  Hereinafter, embodiments of the electromagnetic contactor according to the present invention will be described in detail with reference to FIGS. 1 to 7. The present invention is not limited to the embodiments described below.

Embodiment 1.
FIG. 1 is a perspective view showing the external structure of the entire electromagnetic contactor of the first embodiment. FIG. 2 is a perspective view showing a perspective structure of a contact portion that constitutes the electromagnetic contactor of the first embodiment. 3 and 4 are a perspective view and a cross-sectional view showing the internal structure of the arc-extinguishing chamber that constitutes the electromagnetic contactor of the first embodiment. FIG. 5: is a perspective view which shows the structure of the grid case which comprises the electromagnetic contactor of Embodiment 1. As shown in FIG. FIG. 6 is a sectional view for explaining the operation of the electromagnetic contactor of the first embodiment. Note that the vertical direction, the depth direction, and the width direction are defined as directions orthogonal to each other, as shown in FIGS. That is, the direction in which the movable contact and the fixed contact, which will be described later, come into contact with and out of contact with each other is the up-down direction, the direction crossing the up-down direction and the direction along the longitudinal direction of the movable contact is the width direction, and the direction crossing the up-down direction. Therefore, the direction along the lateral direction of the movable contact is defined as the depth direction.

  The configuration and function of the electromagnetic contactor 1 will be described. As shown in FIG. 1, the electromagnetic contactor 1 basically includes a plurality of contact portions 10 that form an arc extinguishing chamber that houses a movable contact 30 and a fixed contact 40 (not shown in FIG. 1) described later. And a drive unit 20 for accommodating an electromagnet or the like (not shown) that vertically drives the movable contactor 30 accommodated in these contact portions 10 by an electromagnetic force. The electromagnetic contactor 1 of the present embodiment has three contact portions 10, but the number can be changed as appropriate. Further, in the following, since the plurality of contact portions 10 have the same configuration, they will be described without distinction.

  As shown in FIG. 2, the contact portion 10 has a rectangular parallelepiped arc cover 11 and a plate-shaped terminal 12 protruding outward at the lower end of the arc cover 11 in the vertical direction. The terminal 12 is for a user to wire when a current is applied to a main open circuit of a contactor (not shown), and is made of, for example, a copper-based metal, and is fixed contact 40 (not shown in FIG. 2) in the arc cover 11. Is placed on the terminal 12 and electrically connected thereto. In the arc cover 11, a plurality of hot gas generated when the movable contact 30a and the fixed contact 40a (both of which are not shown in FIG. 2) are opened to the outside of the arc cover 11, that is, to the outside of the device 1, are provided. The exhaust port 13 is formed. In the present embodiment, five exhaust ports 13 are formed on each of the surfaces facing each other in the width direction, but the number of exhaust ports 13 can be changed as appropriate. Further, the arc cover 11 and the grid case 80 described later correspond to the case in the claims.

  As shown in FIGS. 3 and 4, a movable contact 30, a fixed contact 40, an arc runner 50, which will be described later, are provided in the arc extinguishing chamber formed inside the arc cover 11 of the contact portion 10. An arc horn 60 and a grid case 80 that supports the arc extinguishing grid group 70 are housed. In the present embodiment, except for the movable contact 30 and the arc horn 60, one set of fixed contact 40, one set of arc runner 50, and one set centering on the axis of symmetry AA shown by the alternate long and short dash line in FIG. The arc extinguishing grid group 60 and a set of grid cases 70 are symmetrically arranged in the width direction. Hereinafter, the direction toward the target axis AA in the width direction will be referred to as the width direction inward, and the direction away from the target axis AA in the width direction will be referred to as the width direction outward.

  As shown in FIGS. 3 and 4, the movable contact 30 is formed in, for example, a plate shape, and at both ends in the longitudinal direction (that is, the width direction) of the lower surface 31 which is the lower surface in the vertical direction, For example, each of the movable contacts 30a formed in a plate shape with a copper-based metal material is provided. The movable contact 30 is driven by an electromagnetic force generated by the drive unit 20, and is configured to be in contact with or not in contact with the fixed contact 40a of the fixed contact 40 in the vertical direction. Further, the fixed contactor 40 has a flat plate-shaped connecting portion 41 placed on the plate-shaped terminal 12 and a fixed contact 40a extending upward in the vertical direction from an end portion of the connecting portion 41 inward in the width direction. It has the supporting part 42 which supports. A fixed contact 40a, which is formed in a plate shape from, for example, a copper-based metal material, is provided on an upper surface 43, which is a vertically upper surface of the support portion 42 that constitutes the fixed contact 40. The shapes of the movable contact 30 and the fixed contact 40 are not limited to the shapes of the present embodiment, and can be changed as appropriate.

  The arc runner 50 includes a plate-shaped lower bottom portion 51 placed on the upper surface which is an upper surface in the vertical direction of the connecting portion 41 of the fixed contact 40, and an upper end in the width direction from the end of the lower bottom portion 51 inward in the width direction. The standing portion 52 extends toward the upper end of the rising portion 52 in the up-down direction, and the tip portion 53 extends outward in the width direction from a position close to the fixed contact 40a. With this configuration, the arc runner 50 is formed in a U-shape in cross section when viewed from the depth direction. Further, the pair of tip portions 53 is formed to extend outward in the width direction from a position close to opposite sides of the fixed contact 40a that face each other in the depth direction so as to narrow the distance in the depth direction. By being formed in this way, the arc runner 50 is formed in a substantially U shape in a plan view when viewed from above in the vertical direction. In addition, although the operation will be described later, when the arc runner 50 generates an arc when the movable contact 30a and the fixed contact 40a are opened, the arc runner 50 drives the generated arc outward in the width direction to extend the arc, and the arc extinguishing grid group described later. The arc is cooled by reaching 70 (particularly, the arc extinguishing grids 70a to 70c arranged below in the vertical direction). The shape of the arc runner 50 is not limited to the shape of this embodiment, and can be changed as appropriate.

  As shown in FIGS. 3 and 4, the arc horn 60 includes an enclosing portion 61 that encloses the movable contact 30, an opposing portion 62 that vertically opposes the tip portion 53 of the arc runner 50, and a width direction outer side. And a tip portion 63 that vertically extends and faces the arc extinguishing grid group 70 (specifically, the arc extinguishing grid 70f). Among these, the enclosing portion 61 includes a plate portion 61a formed in a plate shape, an arm portion 61b extending vertically downward from two sides facing each other in the width direction of the plate portion 61a, and connected to the facing portion 62, and a plate portion. 61a has two arms facing each other in the depth direction and has arms 61c extending downward in the vertical direction and connected to each other. The arc horn 60 is formed so that the surrounding portion 61 includes the plate portion 61a, the arm portion 61b, and the arm portion 61c, so that the arc horn 60 includes a substantially U-shape shown by a symbol U. Although the operation will be described later, when the arc horn 60 generates an arc when the movable contact 30a and the fixed contact 40a are opened, the arc horn 60 drives the generated arc upward and upward to extend the arc extinguishing grid group described later. The arc is cooled by reaching 70 (particularly, the arc extinguishing grids 70d to 70f arranged above and below in the vertical direction). The shape of the arc horn 60 is not limited to the shape of this embodiment, and can be changed as appropriate.

  In the arc-extinguishing grid group 70, the same plate-shaped arc-extinguishing grids 70a to 70f made of a plurality of (for example, six) magnetic bodies are separated from each other by a predetermined distance L1 in this order from the bottom to the top in the vertical direction. It is supported by the grid case 80 so as to be arranged so as to be overlapped, and is arranged outward in the width direction with respect to the movable contact 30a and the fixed contact 40a. Specifically, in the arc-extinguishing grid group 70, which is arranged at the lowermost position in the vertical direction, the arc-extinguishing grid 70a has a lower surface 70ad that is a vertically lower surface of the arc-quenching grid 70a in the vertical direction of the tip portion 53 of the arc runner 50. It is supported by the grid case 80 so as to face the upper surface 53a, which is the upper surface, with the same distance as the predetermined distance L1. Further, in the arc extinguishing grid group 70 arranged in the uppermost position in the vertical direction of the arc extinguishing grid group 70, the upper surface 70fa, which is the upper surface in the vertical direction of the arc extinguishing grid 70f, is in the vertical direction of the tip 63 of the arc horn 60. It is supported by the grid case 80 so as to face the lower surface 63a, which is the lower surface of the, with a distance equal to the predetermined distance L1.

  As shown in FIG. 5, a plurality (for example, 6 sets) of housing grooves 82a to 82f are respectively formed on the inner surface, which is the inner surface of the side wall portion 82 of the grid case 80, in the vertical direction from the bottom to the top, respectively. The arc extinguishing grids 70a to 70f are formed so as to be separated from each other by a predetermined distance L2, and the arc extinguishing grids 70a to 70f are supported as described above by being housed in the housing grooves 82a to 82f. The predetermined distance L2 is substantially the same as the thickness of the arc extinguishing grids 70a to 70f that form the arc extinguishing grid group 70. An insertion hole 83a is formed on the inner surface of the upper wall portion 83 of the grid case 80, and the tip portion 63 of the arc horn 60 is inserted into the accommodation hole 83a, whereby the arc horn 60 is inserted. Are supported as described above.

  Although the operation will be described later, in the arc extinguishing grid group 70, the arc generated when the movable contact 30a and the fixed contact 40a are opened is driven and stretched by the arc runner 50, the arc horn 60 and the like. When it comes into contact with, the arc that has come into contact is divided and extinguished.

  In addition, on the inner surface, which is the inner surface of the bottom wall portion 81 of the grid case 80, a plurality of slits 81a having a predetermined depth extending in the vertical direction are provided at positions spaced apart from each other by a predetermined distance in the width direction. Has been formed. Even if the arc extinguishing grids 70a to 70f are accommodated in the accommodating grooves 82a to 82f, the slits 81a are not closed by these arc extinguishing grids 70a to 70f, and hot gas described later can pass therethrough.

  In addition, inlets 81b to 81d that communicate the inner surface and the outer surface are formed above the slit 81a in the vertical direction, that is, at predetermined positions on the movable contact 30a side in the contact direction. Of these, the introduction port 81b is formed at a position facing in the width direction with respect to the vertical gap between the arc extinguishing grid 70d and the arc extinguishing grid 70e, and the introduction port 81c is extinguished with the arc extinguishing grid 70e. The inlet 81d is formed at a position opposed to the vertical gap with the grid 70f in the width direction, and the introduction port 81d is opposed to the gap between the arc extinguishing grid 70f and the tip 63 of the arc horn 80 in the width direction. It is formed at the position where

  Further, as shown in FIG. 3, a concave portion 81e is formed on the outer surface of the bottom wall portion 81 of the grid case 80. When the grid case 80 is housed in the arc case 11, as shown in FIG. 4, a gap, that is, an exhaust passage, is formed by the recesses 81e provided on the inner surface of the arc case 11 and the outer surface of the bottom wall 81 of the grid case 80. P is constructed. With this structure, the passage is a vertically extending passage.

  In addition, as shown in FIG. 4, the upper end 81f of the recess 81e is located vertically above the position where the upper end 81f of the recess 81e opposes in the widthwise direction with respect to the vertical gap between the tip 63 of the arc horn 60 and the arc extinguishing grid 70f. It is formed so as to be located. In other words, the introduction ports 81b to 81d are located closer to the fixed contact 40a than the upper end 81f, which is the tip of the exhaust path P on the side of the movable contact 30a. Although the operation will be described later, the hot gas generated at the time of contact opening of the movable contact 30a and the fixed contact 40a and introduced into the exhaust passage P from the introduction ports 81b to 81d by the above-mentioned formation is introduced. It stays above 81d in the vertical direction. Then, the hot gas introduced and accumulated first collides with the hot gas introduced later, so that the energy of the hot gas is reduced, and as a result, the exhaust amount of the hot gas outside the device is reduced. To do.

  Similarly, the lower end portion 81g of the recess 81e is formed so as to be located below the exhaust port 13 formed in the arc cover 11 in the vertical direction. In other words, the exhaust port 13 is located closer to the movable contact 30a than the lower end portion 81g, which is the tip of the exhaust passage P on the fixed contact 40a side. Although the operation will be described later, the hot gas generated at the time of contact opening of the movable contact 30a and the fixed contact 40a and introduced into the exhaust passage P from the introduction ports 81b to 81d is formed in this way. It stays below 13 in the vertical direction. Then, the hot gas introduced and accumulated first collides with the hot gas introduced later, so that the energy of the hot gas is reduced, and as a result, the exhaust amount of the hot gas outside the device is reduced. To do.

  Although the operation will be described later, “between a plurality of arc extinguishing grids 70a to 70f forming the arc extinguishing grid group 70 → the slit 81a formed in the grid case 80 → the introduction port 81b formed in the grid case 80 And 81c-> the exhaust passage P formed by the arc cover 11 and the grid case 80-> the exhaust port 13 formed in the arc cover 11 '', and "a plurality of arc-extinguishing grids 70f and arcs forming the arc-extinguishing grid group 70". Between the tip portion 63 of the horn 60-> the inlet 81d formed in the grid case 80-> the exhaust path P formed by the arc cover 11 and the grid case 80-> the exhaust port 13 formed in the arc cover 11 ' Serves as an exhaust path for hot gas generated when the movable contact 30a and the fixed contact 40a are opened. In the present embodiment, the casing is composed of a plurality of members of the arc cover 11 and the grid case 80, but the present invention is not limited to this configuration, and the casing of the arc cover 11 and the grid case 80 is a single member. May be configured.

  The operation and effect of the electromagnetic contactor 1 configured as above will be described with reference to FIG. When the movable contact 30a and the fixed contact 40a are separated from each other (when the contact is opened) while the movable contact 30a and the fixed contact 40a are in contact with each other and are energized, an arc Arc1 is generated between the movable contact 30a and the fixed contact 40a. Specifically, when the movable contact 30a separates from the fixed contact 40a, the contact area decreases, and the electric resistance value increases. Since the electric resistance value becomes large, heat is generated at the contact, and part of the contact is melted due to the generated heat, and metal vapor (that is, hot gas) is generated. Then, the hot gas is cooled and a part thereof becomes an arc. In this way, arc and hot gas are generated when the contacts are opened.

  As described above, in the present embodiment, the electromagnetic contactor 1 is provided with the arc runner 50, and since the arc runner 50 is formed in a substantially U shape in a plan view as described above, it is based on the known principle of Der ion. Generates a driving force outward in the width direction. Due to this driving force, the generated arc Arc1 is driven outwardly in the width direction like the arc Arc2 to be stretched, and the arc extinguishing grid group 70 (in particular, the arc extinguishing grids 70a to 70c arranged vertically below). Is reached, divided, and extinguished.

  Further, as described above, in the present embodiment, the electromagnetic contactor 1 is provided with the arc horn 60, and the arc horn 60 includes the substantially U-shaped shape shown by the symbol U in FIG. 3 as described above. Therefore, the driving force is generated upward in the vertical direction based on the well-known principle of deer ions. Due to this driving force, the generated arc Arc1 is driven upward in the vertical direction to be stretched, reaches the arc extinguishing grid group 70 (in particular, the arc extinguishing grids 70d to 70f arranged in the vertical upward direction), and is divided. It is extinguished.

  Further, since the generated hot gas is metal vapor, it is a high temperature gas having conductivity. If the arc continues to stay around the fixed contact 40a, it becomes difficult to cool the arc and the extinguishing of the arc is delayed. Therefore, an exhaust path is required to keep the generated hot gas away from the vicinity of the contact. In the prior art, the inlet to the exhaust passage for exhausting the hot gas to the outside of the device had a structure close to the hot gas generation position (fixed contact). Therefore, the length of the exhaust path that the hot gas follows until it is exhausted to the outside of the device is short, the hot gas cannot be cooled sufficiently, and the exhaust amount (volume) of the hot gas to the outside of the device is reduced. There was a possibility that it could not be suppressed sufficiently. Further, as shown in FIG. 1, a plurality of the devices are often arranged adjacent to the same device. In a conventional device that cannot sufficiently suppress the exhaust amount (volume) of hot gas, when a large amount is discharged to the outside of the device, the hot gas discharged and spread from the device and the device arranged adjacent to the device When the hot gas that has been discharged and spread comes into contact with each other, and the contact between the device and the device adjacent to the device becomes conductive (that is, an inter-phase short circuit) via the contacted hot gas. Can happen. Conventionally, even if the exhaust volume (volume) of hot gas cannot be sufficiently suppressed by taking sufficient space such as increasing the size of the arc-extinguishing chamber or installing adjacent devices so as to be separated from each other, I was trying to prevent a situation where the two were in conduction. For this reason, it has not been possible to reduce the size of the mechanical device, control panel, etc. in which the device is incorporated.

  In this respect, in the present embodiment, the inlets 81b to 81d are not provided on the fixed contact 40a side in the vertical direction of the grid case 80 (corresponding to the related art), but on the movable contact 30a side in the vertical direction of the grid case 80. The introduction ports 81b to 81d are provided. As a result, the length of the exhaust path in the arc-extinguishing chamber, which the hot gas follows until it is exhausted to the outside of the device, can be made longer than in the prior art, so that energy consumption of the hot gas due to friction loss is promoted and Can be sufficiently cooled, and by extension, the exhaust amount (volume) of the hot gas to the outside of the device can be further suppressed. Further, since the amount of hot gas exhausted to the outside of the device can be suppressed, even if the hot gas discharged from the device spreads, it does not come into contact with the hot gas discharged from the adjacent device. This makes it difficult to cause a situation in which the contact of the device and the contact of the device arranged adjacent to the device are electrically connected to each other. That is, it is possible to suppress the occurrence of an interphase short circuit. Therefore, it is possible to reduce the size of a mechanical device, a control panel, etc. in which the device is incorporated.

  Specifically, most of the generated hot gas is, as shown by an arrow D1 in FIG. 6, a vertical gap between the tip 53 of the arc runner 50 and the arc extinguishing grid 70a, the arc extinguishing grid 70a and the arc extinguishing grid 70b. Through the vertical gap between the arc extinguishing grid 70b and the arc extinguishing grid 70c, and collides with the inner surface of the grid case 80. At this time, the pressure on the arc extinguishing grids 70a to 70c side through which most of the generated hot gas passes increases, while the pressure on the arc extinguishing grids 70d to 70f side through which only part of the generated hot gas passes decreases. Since the gas has a property of flowing from the higher pressure side to the lower pressure side, the hot gas spreads so as to diffuse to the lower pressure side, and the hot gas also passes through the arc extinguishing grids 70d to 70f. As described above, since the flow path of the hot gas to the arc extinguishing grids 70d to 70f is secured, the arc Arc1 is easily driven by the arc horn 60 and the above flow path, and many arcs are driven by the arc extinguishing grids. Therefore, the current interruption performance is improved.

  The hot gas that has passed through the arc runner 50 and the arc extinguishing grids 70a to 70c and collided with the inner surface of the grid case 80 changes its traveling direction as shown by an arrow D2 in FIG. 6, and along the slit 81a formed in the grid case 80. To move. When the hot gas moved along the slit 81a reaches the introduction ports 81b and 82c, the hot gas changes its traveling direction as shown by an arrow D3 in FIG. 6 and is introduced into the exhaust passage P constituted by the arc cover 11 and the grid case 80. To be done. Similarly, the hot gas that has passed through the arc extinguishing grids 70d to 70f and the tip portion 63 of the arc horn 60 is introduced into the exhaust passage P from the introduction port 81d. The inlets 81b to 81d are located closer to the fixed contact 40a than the upper end 81f, which is the tip of the exhaust path P on the movable contact 30a side. Therefore, a part of the hot gas introduced into the exhaust passage P flows upward in the vertical direction from the inlets 81b to 81d and collides with the upper end portion 81f and stays there, as shown by an arrow D31 in FIG. Then, the hot gas introduced earlier and stayed in this way and the hot gas introduced later collide with each other, thereby reducing the energy of the hot gas, and as a result, exhausting the hot gas to the outside of the device. The amount is reduced.

  The hot gas introduced into the exhaust passage P changes its traveling direction as a whole as indicated by an arrow D4 in FIG. 6, and moves along the exhaust passage P. The exhaust port 13 is located closer to the movable contact 30a than the lower end portion 81g, which is the tip of the exhaust passage P on the fixed contact 40a side. Therefore, a part of the hot gas introduced into the exhaust passage P flows downward in the vertical direction with respect to the exhaust port 13 and collides with the lower end portion 81g and stays there, as shown by an arrow D51 in FIG. Then, the hot gas introduced earlier and stayed in this way and the hot gas introduced later collide with each other, thereby reducing the energy of the hot gas, and as a result, exhausting the hot gas to the outside of the device. The amount is reduced.

  When the hot gas that has moved along the exhaust path P reaches the exhaust port 13, the hot gas changes its traveling direction as shown by an arrow D5 in FIG.

Embodiment 2
The electromagnetic contactor according to the present invention is not limited to the configuration of the first embodiment. FIG. 7 shows the configuration of a grid case that constitutes Embodiment 2 of the electromagnetic contactor according to the present invention. The grid case 80A has a configuration similar to that of the grid case 80 that configures the electromagnetic contactor shown in FIGS. 1 to 6, and the path changing portion 81i is vertically downward of the inlets 81b to 81d in the grid case 80A. And 81j. Hereinafter, differences from the configuration of the first embodiment will be mainly described, and the same configurations will be denoted by the same reference numerals. Further, in the present embodiment, except for the introduction port 81d and the bottom wall portion 81, the respective constituent elements are symmetrically arranged in the depth direction about the axis of symmetry BB shown by the alternate long and short dash line in FIG. . Hereinafter, the direction toward the target axis BB in the depth direction will be referred to as the depth direction inward, and the direction away from the target axis BB in the depth direction will be referred to as the depth direction outward.

  As shown in FIG. 7, a concave portion 81e is formed on the outer surface of the bottom wall portion 81 of the grid case 80A, and course changing portions 81i and 81j are formed in the concave portion 81e. Specifically, the course changing portion 81i is formed in a rectangular parallelepiped shape that extends in the depth direction, and is spaced downward from the introduction port 81b by a predetermined distance in the vertical direction and is spaced from the side end portion 81h by a predetermined distance in the depth direction. It is located in a position. Further, the two course changing portions 81j are arranged at positions vertically downwardly separated from the course changing portions 81i by a predetermined distance, and extend inward in the depth direction from the side end portions 81h so that their tips are opposed to each other. It is formed in a shape.

  In the electromagnetic contactor including the grid case 80A configured as described above, the hot gas generated when the contact between the movable contact 30a and the fixed contact 40a is opened is introduced into the exhaust passage P from the inlets 81b to 81d as described above. Then, the introduced hot gas collides with the upper surface, which is the upper surface in the vertical direction of the course changing portion 81i, as shown by an arrow D5 in FIG. The changed hot gas collides with the side end portion 81e and changes its traveling direction downward in the vertical direction. The hot gas whose traveling direction is changed downward in the up-down direction collides with the upper surface which is the upper surface in the up-down direction of the course changing portion 81j, changes its traveling direction inward in the depth direction, and joins, as shown by an arrow D6 in FIG. Then, the merged hot gas travels vertically downward between the opposing tips of the two course changing portions 81j. Then, it is exhausted to the outside of the apparatus through an exhaust port 13 (not shown). In this way, by providing the path changing portions 81i and 81j in the recess 80e of the grid case 80A, the exhaust path can be extended, and the amount of hot gas exhausted to the outside of the device can be further reduced by the cooling effect. The course changing portions 81i and 81j are not limited to the rectangular parallelepiped shape and the like, but may be formed in a protruding shape, for example. The point is that the route changing portions 81i and 81j have any shape as long as they can extend the exhaust path of the hot gas inside the exhaust path P, and correspond to the path extension member in the claims.

  In addition, in each of the above-described embodiments (including modified examples), as shown in FIG. 4, the introduction ports 81b to 81d are formed above the movable contact 30a in the vertical direction, but the formation position is not limited to this. I can't. Alternatively, for example, the introduction ports 81b to 81d may be formed closer to the movable contact 30a than the central position in the state where the movable contact 30a and the fixed contact 40a are most distant from each other. In short, if the introduction ports 81b to 81d are formed on the movable contact 30a side in the contact direction, the same operational effect can be achieved.

  According to the electromagnetic contactor of the present invention, the arc breaking performance at the time of contact opening is improved, so that damage to the movable contact 30a and the fixed contact 40a can be reduced, and the amount of metal used for the contact is reduced. can do. Further, since the exhaust amount of hot gas generated when the contact is opened can be suppressed, the arc space with the ground metal adjacent to the electromagnetic contactor can be reduced, and the mechanical device or control panel in which the product is incorporated can be reduced. Can be miniaturized.

DESCRIPTION OF SYMBOLS 1 Electromagnetic contactor, 10 contact part, 11 arc cover, 12 terminal, 20 drive part, 30 movable contactor, 30a movable contact, 40 fixed contactor, 40a fixed contact point, 50 arc runner, 60 arc horn, 70 arc extinguishing grid group , 70a-70f arc extinguishing grid, 80,80A grid case, 81 bottom wall part, 81a slit, 81b-81d inlet, 81e recessed part, 81f upper end part, 81g lower end part, 81h side end part, 81i-81j course change part (Route extension member), 82 Side wall portion, 82a to 82f accommodation groove, 83 Upper wall portion, 83a Insert hole, P Exhaust passage.

In order to solve the above-mentioned problems and to achieve the object, in the electromagnetic contactor according to claim 1, a fixed contact provided with a fixed contact and a movable contact are provided so that the movable contact comes into contact with the fixed contact. The housing includes a movable contactor capable of contacting and a casing having an exhaust passage for exhausting hot gas generated when the contact between the movable contact and the fixed contact is opened. The casing has a movable contact and a fixed contact. and the movable contact side in the touch direction is a contactless directions exhaust, as well as have the inlet for introducing a hot gas into the exhaust passage, the fixed contact side in the contact direction, the hot gas introduced into the exhaust passage to the outside It was decided to have an exhaust port that

Claims (10)

A fixed contact provided with a fixed contact,
A movable contact that is provided with a movable contact and is capable of contacting and non-contacting the movable contact with the fixed contact,
A casing having an exhaust passage for exhausting hot gas generated at the time of opening the contact between the movable contact and the fixed contact,
The casing has an inlet for introducing the hot gas into the exhaust passage on the side of the movable contact in a contact direction, which is a direction in which the movable contact and the fixed contact are in contact and non-contact with each other. Electromagnetic contactor. The electromagnetic contactor according to claim 1, wherein the introduction port is located closer to the movable contact than a central position in a state where the movable contact and the fixed contact are most separated from each other. The said housing | casing has an exhaust port which exhausts the hot gas introduce | transduced into the said exhaust path outside to the said fixed contact side in the said contact direction of the said movable contact and the said fixed contact. Electromagnetic contactor. The exhaust passage is a passage extending in the contact direction,
The electromagnetic contactor according to claim 3, wherein the introduction port is located on the fixed contact side with respect to the tip of the exhaust passage on the movable contact side. The exhaust passage is a passage extending in the contact direction,
The electromagnetic contactor according to claim 3, wherein the exhaust port is located closer to the movable contact than a tip of the exhaust passage on the fixed contact side. The casing is configured by a grid case that accommodates an arc-extinguishing grid that divides an arc generated when the contact between the movable contact and the fixed contact is opened, and an arc cover that accommodates the grid case. The electromagnetic contactor according to claim 5. The electromagnetic contactor according to claim 6, wherein a slit that guides the hot gas to the inlet is formed in the grid case. The electromagnetic contactor according to claim 6 or 7, wherein the exhaust passage is formed by a gap between an outer surface of the grid case and an inner surface of the arc cover. The electromagnetic contactor according to any one of claims 1 to 8, wherein the exhaust path includes a path extension member that extends the exhaust path of the hot gas inside the exhaust path. The electromagnetic contactor according to claim 9, wherein the extension member is a course changing unit that changes a course of the hot gas.

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