CN111868869A

CN111868869A - Electromagnetic contactor

Info

Publication number: CN111868869A
Application number: CN201880005454.4A
Authority: CN
Inventors: 五十岚胜俊; 堀田克辉; 小林笃志
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2018-03-23
Filing date: 2018-03-23
Publication date: 2020-10-30
Anticipated expiration: 2038-03-23
Also published as: KR102194812B1; JPWO2019180931A1; KR20200032027A; CN111868869B; TW201941238A; JP6455652B1; WO2019180931A1; TWI691993B

Abstract

An electromagnetic contactor (1) is provided with: a fixed contact (40) provided with a fixed contact (40 a); a movable contact (30) which is provided with a movable contact (30a) and can bring the movable contact (30a) into and out of contact with a fixed contact (40 a); and a housing having an exhaust passage (P) for exhausting hot air generated when the movable contact (30a) and the fixed contact (40a) are disconnected to the outside. The frame body is composed of an arc cover (11) and a grid shell (80), wherein the side of the movable contact (30a) in the contact direction of the movable contact (30a) and the fixed contact (40a) is provided with leading-in ports (81 b-81 d) for leading hot air into the exhaust passage P, and the side of the fixed contact (40a) in the contact direction of the movable contact (30a) and the fixed contact (40a) is provided with an exhaust port (13) for exhausting the hot air led into the exhaust passage P to the outside.

Description

Electromagnetic contactor

Technical Field

The present invention relates to an electromagnetic contactor including an exhaust passage for cooling hot air generated when contacts between a movable contact and a fixed contact are opened and exhausting the hot air to the outside of the electromagnetic contactor.

Background

Conventionally, as such a device, an electromagnetic contactor described in patent document 1 is known. The device is configured to be provided with: a fixed contact provided with a fixed contact; a movable contact provided with a movable contact that can be brought into contact with and out of contact with the fixed contact; and an arc-extinguishing grid group in which a plurality of arc-extinguishing grids are arranged in a horizontal direction so as to be separated from each other, and further comprising an exhaust passage disposed above the fixed contact and the movable contact and extending in the horizontal direction. Specifically, the exhaust passage is configured to include: a 1 st guide wall which is disposed above the arc-extinguishing grid group of the fixed contact and the movable contact, is disposed below the fixed contact and the movable contact, and extends in a horizontal direction; a 2 nd guide wall which is disposed above the arc-extinguishing grid group of the fixed contact and the movable contact, is located above the fixed contact and the movable contact, is spaced apart from the fixed contact and the movable contact, and extends in a horizontal direction; a 1 st opening provided at an end of the 1 st guide wall on the fixed contact side; and a 2 nd opening provided at an end portion of the 2 nd guide wall on the movable contact side.

In the device configured as described above, if hot gas is generated between the two contacts when the contacts of the movable contact and the fixed contact are opened, the generated hot gas passes through a plurality of arc-extinguishing grids constituting the arc-extinguishing grid group, is introduced into the exhaust passage from the 1 st opening provided at the fixed contact side end portion of the 1 st guide wall, and is exhausted to the outside of the device through the exhaust passage from the 2 nd opening provided at the movable contact side end portion of the 2 nd guide wall. Since the hot gas is cooled and has a low temperature when passing through the exhaust passage, the volume is reduced, and the amount of exhaust of the hot gas to the outside of the apparatus can be reduced.

Patent document 1: japanese laid-open patent publication No. H02-090422

Disclosure of Invention

However, in the above-described conventional technique, as described above, the 1 st opening is provided at the end portion of the 1 st guide wall on the fixed contact side, and the 1 st opening is close to the position of generation of hot gas generated when the contact is opened. Therefore, the length of the exhaust path from the fixed contact point, which is the location where the hot gas is generated, to the 1 st opening, inside the arc extinguishing chamber through which the hot gas passes is short, and therefore the hot gas cannot be sufficiently cooled, and the amount of exhaust of the hot gas to the outside of the device may not be sufficiently suppressed.

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

In order to solve the above problems and achieve the object, an electromagnetic contactor according to claim 1 includes: a fixed contact provided with a fixed contact; a movable contact provided with a movable contact and capable of contacting and not contacting the fixed contact; and a housing having an exhaust duct for exhausting hot air generated when the movable contact and the fixed contact are disconnected to the outside, wherein the housing has an introduction port for introducing the hot air into the exhaust duct on the movable contact side in a contact direction, which is a direction in which the movable contact and the fixed contact are in and out of contact with each other.

ADVANTAGEOUS EFFECTS OF INVENTION

The electromagnetic contactor according to the present invention has the inlet port for introducing the hot gas into the exhaust duct on the movable contact side, so that the exhaust path of the hot gas becomes long, and the cooling effect of the hot gas until the hot gas is exhausted can be improved.

Drawings

Fig. 1 is a perspective view showing an overall external structure of an electromagnetic contactor according to embodiment 1 of the present invention.

Fig. 2 is a perspective view showing a contact portion constituting an electromagnetic contactor according to embodiment 1 of the present invention, and shows a perspective structure thereof.

Fig. 3 is a perspective view showing an internal structure of an arc extinguishing chamber of embodiment 1 constituting the electromagnetic contactor according to the present invention.

Fig. 4 is a cross-sectional view showing an internal structure of an arc extinguishing chamber of embodiment 1 constituting the electromagnetic contactor according to the present invention.

Fig. 5 is a perspective view showing the structure of the grid housing constituting embodiment 1 of the electromagnetic contactor according to the present invention.

Fig. 6 is a cross-sectional view for explaining the operation of embodiment 1 of the electromagnetic contactor according to the present invention.

Fig. 7 is a perspective view showing the structure of the grid housing constituting embodiment 2 of the electromagnetic contactor according to the present invention.

Detailed Description

Embodiments of an electromagnetic contactor according to the present invention will be described in detail below with reference to fig. 1 to 7. The present invention is not limited to the following embodiments.

Embodiment mode 1

Fig. 1 is a perspective view showing an external appearance structure of an electromagnetic contactor according to embodiment 1 as a whole. Fig. 2 is a perspective view showing a contact portion constituting an electromagnetic contactor according to embodiment 1. Fig. 3 and 4 are a perspective view and a sectional view showing an internal structure of an arc extinguishing chamber constituting the electromagnetic contactor according to embodiment 1. Fig. 5 is a perspective view showing the structure of a grid housing constituting an electromagnetic contactor according to embodiment 1. Fig. 6 is a sectional view for explaining the operation of the electromagnetic contactor according to embodiment 1. The vertical direction, the depth direction, and the width direction are defined as mutually orthogonal directions as illustrated in fig. 1 to 6. That is, a direction in which a movable contact and a fixed contact are brought into and out of contact, which will be described later, is defined as a vertical direction, a direction crossing the vertical direction and extending in a longitudinal direction of the movable contact is defined as a width direction, and a direction crossing the vertical direction and extending in a short-side direction of the movable contact is defined as a depth direction.

The structure 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 constitute an arc extinguishing chamber for accommodating a movable contact 30, a fixed contact 40, and the like (not shown in fig. 1) described later; and a driving unit 20 that houses an electromagnet, not shown, and the like that drives the movable contact 30 housed in the contact portions 10 in the vertical direction by electromagnetic force. The electromagnetic contactor 1 of the present embodiment includes 3 contact portions 10, but the number can be changed as appropriate. 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 includes: a rectangular parallelepiped arc cover 11; and a plate-shaped terminal 12 protruding outward at a lower end in the vertical direction of the arc cover 11. The terminal 12 is formed of a user wiring, for example, a copper-based metal, and is used for electrically connecting the terminal 12 with a contact 40 (not shown in fig. 2) fixed in the arc cover 11 placed on the terminal 12 when a current flows through a main open circuit of a contactor (not shown). The arc cover 11 is provided with a plurality of exhaust ports 13 for exhausting hot air generated when the contacts of the movable contact 30a and the fixed contact 40a (not shown in fig. 2) are opened to the outside of the arc cover 11, that is, the outside of the apparatus 1. In the present embodiment, the number of the exhaust ports 13 is 5 on each of the surfaces facing in the width direction, but the number of the exhaust ports can be changed as appropriate. The arc cover 11 and the later-described grill case 80 correspond to the frame body of the claims.

As shown in fig. 3 and 4, in the arc extinguishing chamber formed inside the arc cover 11 of the contact portion 10, a movable contact 30, a fixed contact 40, an arc runner 50, an arc striking angle 60, and a grid housing 80 supporting an arc extinguishing grid group 70, which will be described later, are housed. In the present embodiment, except for the movable contact 30 and the

arcing horn

60, 1 set of

fixed contacts

40, 1 set of

arc runners

50, 1 set of arc-

extinguishing grid sets

60, and 1 set of grid cases 70 are arranged symmetrically in the width direction around the axis of symmetry a-a shown by a chain line in fig. 4. Hereinafter, a direction toward the target axis a-a in the width direction is referred to as a width direction inner side, and a direction away from the target axis a-a in the width direction is referred to as a width direction outer side.

As shown in fig. 3 and 4, the movable contact 30 is formed in a plate shape, for example, and movable contacts 30a formed in a plate shape by a copper-based metal material, for example, are provided at both ends in the longitudinal direction (i.e., the width direction) of the lower surface 31 which is a surface on the upper, lower, and lower sides, respectively. The movable contactor 30 is configured to be driven by an electromagnetic force generated by the driving portion 20 and to be in contact with or not in contact with the fixed contact 40a of the fixed contactor 40 in the vertical direction. Further, the fixed contact 40 is configured to include: a connection portion 41 that is placed on the plate-shaped terminal 12 and has a flat plate shape; and a support portion 42 extending upward in the vertical direction from an end portion on the inner side in the width direction of the connection portion 41 to support the fixed contact 40 a. A fixed contact 40a formed in a plate shape by, for example, a copper-based metal material is provided on an upper surface 43 which is an upper surface in the vertical direction of the support portion 42 constituting the fixed contact 40. The shapes of the movable contact 30 and the fixed contact 40 are not limited to those of the present embodiment, and can be appropriately changed.

The arc runner 50 is configured to have: a lower bottom portion 51 that is placed on an upper surface that is a vertically upper surface of the connecting portion 41 of the fixed contact 40 and has a plate shape; a rising portion 52 extending upward in the vertical direction from an end portion on the inner side in the width direction of the lower bottom portion 51; and a tip end portion 53 extending outward in the width direction from an upper end portion in the vertical direction of the rising portion 52 and a position close to the fixed contact 40 a. With this configuration, the arc runner 50 is formed in a cross-sectional shape of "コ" as viewed from the depth direction. The pair of distal end portions 53 are formed to narrow the distance in the depth direction from positions close to opposite sides of the fixed contact 40a facing each other in the depth direction and extend outward in the width direction. By this formation, the arc runner 50 is formed in a substantially U shape in a plan view from the top to the bottom. In addition, as described later with respect to the operation, if an arc is generated when the contact between the movable contact 30a and the fixed contact 40a is opened, the arc runner 50 drives and stretches the generated arc outward in the width direction so as to reach an arc-extinguishing grid group 70 (in particular, arc-extinguishing grids 70a to 70c arranged vertically downward) described later, and cools the arc. The shape of the arc runner 50 is not limited to the shape of the present embodiment, and can be appropriately changed.

As shown in fig. 3 and 4, the arcing horn 60 includes: an enclosing portion 61 that encloses the movable contact 30; a facing portion 62 facing the front end portion 53 of the arc runner 50 in the vertical direction; and a tip end portion 63 extending outward in the width direction and facing the arc-extinguishing grid group 70 (specifically, the arc-extinguishing grid 70f) in the vertical direction. The surrounding portion 61 includes: a plate portion 61a formed in a plate shape; a wrist portion 61b extending downward from the upper and lower sides of the plate portion 61a in the width direction and connected to the opposing portion 62; and arm portions 61c extending downward from both sides facing each other in the depth direction of the plate portion 61a and connected to each other. The surrounding portion 61 includes a plate portion 61a, a wrist portion 61b, and a wrist portion 61c, and the arcing horn 60 is formed to include a substantially U-shape indicated by a reference numeral U. In addition, as described later, if an arc is generated when the contacts of the movable contact 30a and the fixed contact 40a are opened, the arc striking angle 60 drives and stretches the generated arc upward in the vertical direction to reach an arc extinguishing grid group 70 (in particular, arc extinguishing grids 70d to 70f arranged upward in the vertical direction) described later, and cools the arc. The shape of the arcing horn 60 is not limited to the shape of the present embodiment, and can be changed as appropriate.

The arc-extinguishing grid group 70 is supported by the grid housing 80 and is arranged outside the movable contact 30a and the fixed contact 40a in the width direction, so that the same plate-like arc-extinguishing grids 70a to 70f made of a plurality of (for example, 6) magnets are arranged in an overlapping manner with a predetermined interval L1 therebetween in the order from the bottom to the top in the vertical direction. Specifically, the arc-extinguishing grid 70a disposed at the lowermost position in the vertical direction in the arc-extinguishing grid group 70 is supported by the grid housing 80 such that the lower surface 70ad, which is the lower surface in the vertical direction of the arc-extinguishing grid 70a, faces the upper surface 53a, which is the upper surface in the vertical direction of the front end portion 53 of the arc runner 50, at the same interval as the predetermined interval L1. Further, the arc-extinguishing grid 70f disposed uppermost in the vertical direction in the arc-extinguishing grid group 70 is supported by the grid case 80 such that an upper surface 70fa, which is a vertically upper surface of the arc-extinguishing grid 70f, faces a lower surface 63a, which is a vertically lower surface of the distal end portion 63 of the arcing angle 60, at the same interval as the predetermined interval L1.

As shown in fig. 5, a plurality of (e.g., 6 sets of) housing grooves 82a to 82f are formed in the inner surface, which is the inner surface of the side wall portion 82 of the grid case 80, at predetermined intervals L2 in the vertical direction from below to above, and arc-extinguishing grids 70a to 70f are housed in these housing grooves 82a to 82f, whereby the arc-extinguishing grids 70a to 70f are supported as described above. The predetermined interval L2 is substantially the same as the thickness of the arc-extinguishing grids 70a to 70f constituting the arc-extinguishing grid group 70. The insertion hole 83a is formed in the inner surface of the upper wall 83 of the grill case 80, and the front end 63 of the arcing horn 60 is inserted into the insertion hole 83a, whereby the arcing horn 60 is supported as described above.

In addition, as described later with respect to the operation, if an arc generated when the contact between the movable contact 30a and the fixed contact 40a is opened is driven and stretched by the arc runner 50, the arcing horn 60, and the like to contact the arc-extinguishing grid group 70, the arc-extinguishing grid group 70 interrupts the arc that has contacted the arc, and extinguishes the arc.

A plurality of (e.g., 4) slits 81a of a predetermined depth extending in the vertical direction are formed in the inner surface, which is the inner surface of the bottom wall 81 of the grid case 80, at positions spaced apart from each other by a predetermined distance in the width direction. Even if the arc-extinguishing grids 70a to 70f are stored in the storage tanks 82a to 82f, the slits 81a are not closed by these arc-extinguishing grids 70a to 70f, and a hot gas described later can pass therethrough.

Further, introduction ports 81b to 81d for communicating the inner surface and the outer surface are formed at predetermined positions vertically above the slit 81a, that is, on the movable contact 30a side in the contact direction. The inlet 81b is formed at a position opposed to the gap in the vertical direction between the arc-extinguishing grid 70d and the arc-extinguishing grid 70e in the width direction, the inlet 81c is formed at a position opposed to the gap in the vertical direction between the arc-extinguishing grid 70e and the arc-extinguishing grid 70f in the width direction, and the inlet 81d is formed at a position opposed to the gap between the arc-extinguishing grid 70f and the front end 63 of the arcing horn 80 in the width direction.

As shown in fig. 3, a recess 81e is formed in the outer surface of the bottom wall 81 of the grid case 80. When the grid case 80 is housed in the arc case 11, as shown in fig. 4, the exhaust passage P, which is a gap, is formed by the concave portion 81e provided on the inner surface of the arc case 11 and the outer surface of the bottom wall portion 81 of the grid case 80. With this configuration, a passage extending in the vertical direction is formed.

As shown in fig. 4, the upper end portion 81f of the concave portion 81e is formed to be located above the position facing the gap in the width direction between the front end portion 63 of the arcing horn 60 and the arc-extinguishing grid 70f in the vertical direction. In other words, the introduction ports 81b to 81d are located closer to the fixed contacts 40a than the upper end portion 81f, which is the front end of the exhaust duct P on the movable contact 30a side. In addition, as described later, the hot air generated when the contacts of the movable contact 30a and the fixed contact 40a are opened and introduced from the introduction ports 81b to 81d into the exhaust duct P is retained in the vertical direction above the introduction port 81 d. Thus, the hot air introduced and retained first collides with the hot air introduced later, thereby reducing the energy of the hot air, and as a result, the amount of exhaust of the hot air to the outside of the apparatus is reduced.

Similarly, the lower end 81g of the recess 81e is formed to be located vertically below the exhaust port 13 formed in the arc cover 11. In other words, the exhaust port 13 is located closer to the movable contact 30a than the lower end 81g, which is the front end of the exhaust passage P closer to the fixed contact 40 a. In addition, as described later, the hot air generated when the contacts of the movable contact 30a and the fixed contact 40a are opened and introduced from the introduction ports 81b to 81d into the exhaust duct P is retained below the exhaust port 13 in the vertical direction. Thus, the hot air introduced and retained first collides with the hot air introduced later, thereby reducing the energy of the hot air, and as a result, the amount of exhaust of the hot air to the outside of the apparatus is reduced.

In addition, the operation will be described later, "between the plurality of arc-extinguishing grids 70a to 70f constituting the arc-extinguishing grid group 70 → the slit 81a formed in the grid case 80 → the

introduction ports

81b and 81c formed in the grid case 80 → 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 "between the plurality of arc-extinguishing grids 70f constituting the arc-extinguishing grid group 70 and the leading end portion 63 of the arcing horn 60 → the introduction port 81d formed in the grid case 80 → 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" serve as an exhaust path for hot gas generated when the contact of the movable contact 30a and the fixed contact 40a is opened. In the present embodiment, the frame is constituted by a plurality of components of the arc cover 11 and the grid housing 80, but the present invention is not limited to this configuration, and the frame may be constituted by a single component of the arc cover 11 and the grid housing 80.

The operation and effect of the electromagnetic contactor 1 configured as described above will be described with reference to fig. 6. When the movable contact 30a and the fixed contact 40a are separated from each other (when the contacts are opened) in a state where the movable contact 30a and the fixed contact 40a are in contact with each other and energized, an Arc1 is generated between the movable contact 30a and the fixed contact 40 a. Specifically, when the movable contact 30a is separated from the fixed contact 40a, the contact area is small, and therefore the resistance value is large. Since the resistance value is increased, heat is generated in the contact, and a part of the contact is melted by the generated heat to generate metal vapor (i.e., hot gas). Then, a part of the hot gas cooled becomes an arc. Thus, when the contacts are opened, an arc and hot gas are generated.

As described above, in the present embodiment, the electromagnetic contactor 1 includes the arc runner 50, and the arc runner 50 is formed in a substantially U shape in a plan view as described above, and therefore, the driving force toward the outer side in the width direction is generated based on the well-known principle of ion elimination. Due to this driving force, the generated Arc1 is driven and stretched outward in the width direction like the Arc2, reaches the Arc-extinguishing grid group 70 (particularly, the Arc-extinguishing grids 70a to 70c arranged vertically below), is divided, and is extinguished.

As described above, in the present embodiment, the electromagnetic contactor 1 includes the arcing horn 60, and the arcing horn 60 is formed in a substantially U-shape including the reference numeral U in fig. 3 as described above, and therefore, the driving force in the vertical direction and the upward direction is generated based on the well-known principle of ion elimination. Due to this driving force, the generated Arc1 is driven and stretched upward in the vertical direction, reaches the Arc-extinguishing grid group 70 (particularly, the Arc-extinguishing grids 70d to 70f arranged upward in the vertical direction), is divided, and is extinguished.

The generated hot gas is a metal vapor and is therefore a high-temperature gas having electrical conductivity. If the arc stays around the fixed contact 40a, the arc is difficult to cool and the arc extinction is delayed, so that an exhaust passage for separating the generated hot gas from the periphery of the contact is required. In the related art, an inlet of an exhaust duct for exhausting hot air to the outside of the device is configured to be close to a position (fixed contact) where the hot air is generated. Therefore, the length of the exhaust path that the hot gas passes through until the hot gas is exhausted outside the device is short, and there is a possibility that the hot gas cannot be sufficiently cooled, and the amount (volume) of exhaust of the hot gas to the outside of the device cannot be sufficiently suppressed. As shown in fig. 1, a plurality of such apparatuses are often arranged adjacent to the same apparatus. In a conventional device in which the amount (volume) of hot gas discharged cannot be sufficiently reduced, if a large amount of hot gas is discharged to the outside of the device, the hot gas discharged from the device and spreading is in contact with the hot gas discharged from a device disposed adjacent to the device, and a phenomenon (i.e., a phase short circuit) may occur in which the contact points of the device and the contact points of the device disposed adjacent to the device are electrically connected via the hot gas in contact. Conventionally, if the space is sufficient, such as when the size of the arc extinguishing chamber is increased or when adjacent apparatuses are installed separately from each other, even if the amount (volume) of exhaust gas of hot gas cannot be sufficiently suppressed, the apparatuses do not conduct each other. Therefore, it is impossible to miniaturize a machine device or a control panel, etc., in which the device is incorporated.

In this regard, in the present embodiment, the introduction ports 81b to 81d are provided not on the fixed contact 40a side in the vertical direction of the grid case 80 (corresponding to the conventional art), but on the movable contact 30a side in the vertical direction of the grid case 80. Accordingly, the length of the exhaust path in the arc extinguishing chamber through which the hot gas passes to the outside of the device can be made longer than in the prior art, and therefore, the energy consumption of the hot gas due to friction loss can be promoted, the hot gas can be sufficiently cooled, and the amount (volume) of exhaust of the hot gas to the outside of the device can be further suppressed. Further, since the amount of hot air discharged to the outside of the device can be suppressed, even if the hot air discharged from the device spreads, it is difficult to contact the hot air discharged from the device disposed adjacent to the device, and it is difficult to cause a phenomenon in which the contact of the device and the contact of the device disposed adjacent to the device are electrically connected. That is, the occurrence of an inter-phase short circuit can be suppressed. Therefore, the mechanical device and the control panel incorporating the device can be miniaturized.

Specifically, most of the generated hot gas passes through the gap in the vertical direction between the tip 53 of the arc runner 50 and the arc-extinguishing grid 70a, the gap in the vertical direction between the arc-extinguishing grid 70a and the arc-extinguishing grid 70b, and the gap in the vertical direction between the arc-extinguishing grid 70b and the arc-extinguishing grid 70c, and collides with the inner surface of the grid housing 80, as indicated by an arrow D1 in fig. 6. At this time, the pressure on the side of the arc-extinguishing grids 70a to 70c through which most of the generated hot gas passes becomes high, while the pressure on the side of the arc-extinguishing grids 70d to 70f through which only a part of the generated hot gas passes becomes low, and since the gas has a property of flowing from the high pressure side to the low pressure side, the hot gas spreads and diffuses to the low pressure side, and the hot gas also passes through the side of the arc-extinguishing grids 70d to 70 f. Since the passage of the hot gas to the Arc-extinguishing grids 70d to 70f is secured in this way, the Arc1 is easily driven by the arcing angle 60 and the passage, and the arcs can be driven by a plurality of Arc-extinguishing grids, thereby improving the current interruption performance.

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 housing 80 changes its traveling direction as indicated by an arrow D2 in fig. 6, and moves along the slits 81a formed in the grid housing 80. When the hot air moving along the slit 81a reaches the

introduction ports

81b and 82c, the traveling direction is changed as shown by an arrow D3 in fig. 6, and the hot air is introduced into the exhaust passage P formed by the arc cover 11 and the grill housing 80. Similarly, the hot air passing through the arc-extinguishing grills 70d to 70f and the front end 63 of the arcing horn 60 is introduced from the inlet 81d into the exhaust passage P. The introduction ports 81b to 81d are located closer to the fixed contacts 40a than the upper end 81f, which is the front end of the exhaust passage P on the movable contact 30a side. Therefore, a part of the hot air introduced into the exhaust passage P flows upward in the vertical direction with respect to the introduction ports 81b to 81D as indicated by an arrow D31 in fig. 6, and collides with the upper end portion 81f to be accumulated. Thus, the hot air introduced first and thus retained collides with the hot air introduced later, thereby reducing the energy of the hot air, and as a result, the amount of exhaust of the hot air to the outside of the apparatus is reduced.

The entire hot air introduced into the exhaust passage P moves along the exhaust passage P while changing its traveling direction as indicated by an arrow D4 in fig. 6. The exhaust port 13 is located closer to the movable contact 30a than a lower end 81g, which is a front end of the exhaust passage P on the fixed contact 40a side. Therefore, a part of the hot air introduced into the exhaust passage P flows downward in the vertical direction of the exhaust port 13 as shown by an arrow D51 in fig. 6, and collides with the lower end portion 81g and is accumulated. Thus, the hot air introduced first and thus retained collides with the hot air introduced later, thereby reducing the energy of the hot air, and as a result, the amount of exhaust of the hot air to the outside of the apparatus is reduced.

Then, if the hot gas moving along the exhaust passage P reaches the exhaust port 13, the hot gas changes its traveling direction as shown by an arrow D5 in fig. 6, and is exhausted from the exhaust passage P.

Embodiment mode 2

The electromagnetic contactor according to the present invention is not limited to the configuration of embodiment 1. Fig. 7 shows a structure of a grid housing constituting embodiment 2 of an electromagnetic contactor according to the present invention. The grid case 80A has a similar configuration to the grid case 80 constituting the electromagnetic contactor shown in fig. 1 to 6, and is different in that the

route changing portions

81i and 81j are provided below and above the introduction ports 81b to 81d of the grid case 80A. Hereinafter, differences from the configuration of embodiment 1 will be mainly described, and the same components will be denoted by the same reference numerals. In the present embodiment, the components are disposed symmetrically in the depth direction around the axis of symmetry B-B shown by the dashed-dotted line in fig. 7, except for the introduction port 81d and the bottom wall portion 81. Hereinafter, a direction in which the depth direction is directed toward the target axis B-B is referred to as a depth direction inner side, and a direction in which the depth direction is separated from the target axis B-B is referred to as a depth direction outer side.

As shown in fig. 7, a recess 81e is formed in the outer surface of the bottom wall 81 of the grid case 80A, and the

route changing portions

81i and 81j are formed in the recess 81 e. More specifically, the course changing portion 81i is formed in a rectangular parallelepiped shape extending in the depth direction, and is disposed at a position spaced apart from the introduction port 81b by a predetermined distance in the vertical direction and downward and spaced apart from the side end portion 81h by a predetermined distance inward in the depth direction. The 2 travel route changing portions 81j are disposed at positions vertically spaced downward from the travel route changing portion 81i by a predetermined distance, and are formed in a rectangular parallelepiped shape extending from the side end portion 81h inward in the depth direction so that the front ends thereof face each other.

In the electromagnetic contactor including the grid case 80A configured as described above, if the hot air generated when the contact between the movable contact 30A and the fixed contact 40A is opened is introduced from the introduction ports 81b to 81D into the exhaust passage P as described above, the introduced hot air collides with the upper surface that is the vertically upper surface of the travel route changing portion 81i as indicated by an arrow D5 in fig. 7, changes the travel direction outward in the depth direction, and the hot air having changed the travel direction collides with the side end portion 81e, and changes the travel direction upward and downward. The hot air having changed the traveling direction in the upward and downward direction collides with the upper surface, which is the upper surface in the upward and downward direction of the travel route changing portion 81j, and changes the traveling direction inward in the depth direction to join, as shown by an arrow D6 in fig. 7, and the joined hot air travels in the upward and downward direction between the tip ends of the 2 travel route changing portions 81 j. Then, the air is discharged from an unillustrated air outlet 13 to the outside of the apparatus. In this way, by providing the

course changing portions

81i and 81j in the recess 80e of the grill case 80A, the exhaust path can be extended, and the amount of hot gas exhausted to the outside of the apparatus can be further reduced by the cooling effect. The

course changing sections

81i and 81j are not limited to the rectangular parallelepiped shape, and may be formed in a convex shape, for example. In short, the

route changing portions

81i and 81j may have any shape as long as they can extend the exhaust path of the hot gas inside the exhaust passage P, and correspond to the path extending member of the claims.

In each of the above embodiments (including the modifications), as shown in fig. 4, the introduction ports 81b to 81d are formed vertically above the movable contact 30a, but the formation positions are not limited to this. For example, the introduction ports 81b to 81d may be formed on the movable contact 30a side with respect to the center position in the state where the movable contact 30a and the fixed contact 40a are most separated from each other. In short, the same operational effects can be obtained by forming the introduction ports 81b to 81d on the movable contact 30a side in the contact direction.

Industrial applicability

According to the electromagnetic contactor according to the present invention, by improving the arc breaking performance at the time of contact opening, damage to the movable contact 30a and the fixed contact 40a can be reduced, and the amount of metal used in the contacts can be reduced. Further, since the amount of exhaust of hot air generated when the contacts are opened can be suppressed, the arc space of the grounding metal adjacent to the electromagnetic contactor can be reduced, and the size of the machine or control panel in which the product is incorporated can be reduced.

Description of the reference numerals

1 electromagnetic contactor, 10 contact portion, 11 arc cover, 12 terminal, 20 driving portion, 30 movable contact, 30A movable contact, 40 fixed contact, 40A fixed contact, 50 arc runner, 60 arc striking angle, 70 arc extinguishing grid group, 70A to 70f arc extinguishing grid, 80A grid housing, 81 bottom wall portion, 81a slit, 81b to 81d introduction port, 81e recess, 81f upper end portion, 81g lower end portion, 81h side end portion, 81i to 81j travel route changing portion (path extending member), 82 side wall portion, 82a to 82f housing groove, 83 upper wall portion, 83a insertion hole, P exhaust passage.

Claims

1. An electromagnetic contactor is characterized by comprising:

a fixed contact provided with a fixed contact;

a movable contact provided with a movable contact capable of contacting and not contacting the movable contact with the fixed contact; and

a housing having an exhaust passage for exhausting hot air generated when the movable contact and the fixed contact are disconnected to the outside,

the housing has an inlet port for introducing the hot air into the exhaust duct on the movable contact side in a contact direction, which is a direction in which the movable contact and the fixed contact are in contact with each other and are not in contact with each other.

2. The electromagnetic contactor according to claim 1,

the introduction port is located closer to the movable contact than a center position in a state where the movable contact and the fixed contact are most distant from each other.

3. The electromagnetic contactor according to claim 1 or 2,

the housing has an exhaust port for exhausting the hot air introduced into the exhaust passage to the outside, on the fixed contact side in the contact direction between the movable contact and the fixed contact.

4. The electromagnetic contactor according to claim 3,

The exhaust passage is a passage extending in the contact direction,

the introduction port is located closer to the fixed contact than a tip of the exhaust duct on the movable contact side.

5. The electromagnetic contactor according to claim 3 or 4,

the exhaust passage is a passage extending in the contact direction,

the exhaust port is located on the movable contact side of the exhaust passage with respect to a front end of the fixed contact side.

6. The electromagnetic contactor according to any one of claims 1 to 5,

the housing includes a grid housing that houses 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 houses the grid housing.

7. The electromagnetic contactor according to claim 6,

the grill case is provided with a slit for introducing the hot air into the inlet.

8. The electromagnetic contactor according to claim 6 or 7,

the exhaust passage is formed by a gap between an outer surface of the grid housing and an inner surface of the arc cover.

9. The electromagnetic contactor according to any one of claims 1 to 8,

The exhaust duct is provided with a path extension member that extends an exhaust path of the hot gas inside the exhaust duct.

10. The electromagnetic contactor according to claim 9,

the extension member is a route changing unit that changes a route of the hot gas.