Electromagnetic relay

Abstract

The utility model provides an electromagnetic relay. The movable contact includes a movable yoke provided on the movable contact. The movable yoke includes: a base portion provided on a rear surface of the movable contact opposite to the front surface; a first extension portion extending from the base portion toward a surface of the movable contact; and a second extension portion provided at a position facing the first extension portion across the movable contact and extending from the base portion toward the surface of the movable contact, the container having two first protruding portions protruding toward the first extension portion and two second protruding portions protruding toward the second extension portion, the tip end portion of the first extension portion is located between the respective protruding apexes of the two first protruding portions in the arrangement direction in which the first fixed terminal and the second fixed terminal are arranged, and the tip end portion of the second extension portion is located between the respective protruding apexes of the two second protruding portions in the arrangement direction. As a result, it is possible to provide an electromagnetic relay capable of improving arc extinguishing performance.

Description

Technical Field

[0001] This utility model relates to an electromagnetic relay. Background Technology

[0002] In the prior art, there is an electromagnetic relay described in CN210182304U (Patent Document 1). This electromagnetic relay has a fixed terminal and a movable contact. The movable contact moves to make or separate its movable contact from the fixed contact of the fixed terminal. If current flows when the movable contact and the fixed contact are in contact, an electromagnetic repulsive force will act between the movable contact and the fixed contact.

[0003] Therefore, in Patent Document 1, by setting an upper magnetic yoke and a lower magnetic yoke (i.e., a movable magnetic yoke) to form a magnetic circuit surrounding the movable contact, an attractive force is generated by magnetic force, which restricts the movement of the movable contact and the fixed contact to separate due to electromagnetic repulsion, thereby increasing the contact pressure between the movable contact and the fixed contact.

[0004] However, in Patent Document 1, the arc generated when the movable contact is moved to separate the movable contact from the fixed contact tends to move toward the movable yoke, and is therefore not easily elongated and extinguished. Therefore, there is still room for improvement in enhancing arc-extinguishing performance. Utility Model Content

[0005] Problems to be solved by utility models

[0006] This invention was made in view of the above-mentioned situation, and its purpose is to provide an electromagnetic relay that can improve arc extinguishing performance.

[0007] Solution for solving the problem

[0008] One technical solution of this utility model provides an electromagnetic relay, comprising: a container; a first fixed terminal having a first fixed contact disposed within the container; a second fixed terminal having a second fixed contact disposed within the container; a movable contact capable of moving up and down between a first position and a second position, wherein in the first position, the movable contact is in contact with the first fixed contact and the second fixed contact, and in the second position, the movable contact is not in contact with the first fixed contact and the second fixed contact; and a movable magnetic yoke disposed on the movable contact and capable of moving up and down together with the movable contact, the movable magnetic yoke comprising: a base disposed on the back side of the movable contact located on the side opposite to the surface; the movable contact... The head has a surface that can contact the first fixed terminal and the second fixed terminal; a first extension that extends from the base toward the surface of the movable contact; and a second extension that is located opposite the first extension across the movable contact and extends from the base toward the surface of the movable contact. The container has two first protrusions protruding toward the first extension and two second protrusions protruding toward the second extension. The tip of the first extension is located between the respective protruding apexes of the two first protrusions in the arrangement direction of the first fixed terminal and the second fixed terminal, and the tip of the second extension is located between the respective protruding apexes of the two second protrusions in the arrangement direction.

[0009] According to this structure, since the top end of the first extension is located between the two first protrusions on the container in the arrangement direction of the first and second fixed terminals, and the top end of the second extension is located between the two second protrusions on the container in the arrangement direction of the first and second fixed terminals, the first and second extensions are far away from the movable contact and the fixed contact in the arrangement direction. Therefore, the electric arc generated when the movable contact separates from the fixed terminal is not easy to move towards the first and second extensions of the movable yoke. Furthermore, due to the obstruction of the first and second protrusions, the concentration of metal vapor generated by the electric arc within the area defined by the first and second protrusions in the container is lower than that outside the area defined by the first and second protrusions. The gas temperature within the area defined by the first and second protrusions is also lower than that outside the area defined by the first and second protrusions. As a result, the movement of the electric arc toward the movable magnetic yoke located within the area defined by the first and second protrusions can be further suppressed, which is beneficial to elongating the electric arc toward the side with a larger space and can improve the arc extinguishing performance.

[0010] Preferably, the movable contact is disposed below the first fixed contact and the second fixed contact, and the upper end face of the first extension and the upper end face of the second extension are located below the surface of the movable contact.

[0011] According to this structure, since the upper end face of the first extension and the upper end face of the second extension are located below the surface of the movable contact, it is possible to further suppress the movement of the arc generated when the surface of the movable contact separates from the first fixed terminal and the second fixed terminal toward the first extension and the second extension, which is beneficial to further improve the arc extinguishing performance.

[0012] Preferably, the electromagnetic relay further includes an upper magnetic yoke disposed above the movable contact and a retaining member for holding the upper magnetic yoke. When the movable contact is located in the second position, the width of the first extension in the arrangement direction is greater than the width of the portion of the retaining member overlapping the first extension in the arrangement direction, and the width of the second extension in the arrangement direction is greater than the width of the portion of the retaining member overlapping the second extension in the arrangement direction.

[0013] According to this structure, the upper yoke can be held in a simple manner, and a magnetic circuit can be reliably formed using the upper yoke and the movable yoke. Moreover, since the width of the first extension (and the second extension) is greater than the width of the portion of the retainer that overlaps with the first extension (and the second extension) in the direction of the arrangement of the first and second fixed terminals when the movable contact is in the second position, the magnetic field can be concentrated using the first and second extensions with higher permeability, and an attractive force that resists electromagnetic repulsion can be reliably formed, which is beneficial to increasing the contact pressure between the movable contact and the fixed contact.

[0014] Another technical solution of this utility model provides an electromagnetic relay, comprising: a container; a first fixed terminal having a first fixed contact disposed within the container; a second fixed terminal having a second fixed contact disposed within the container; a movable contact capable of moving up and down between a first position and a second position, wherein in the first position, the movable contact is in contact with the first fixed contact and the second fixed contact, and in the second position, the movable contact is not in contact with the first fixed contact and the second fixed contact; and a movable magnetic yoke disposed on the movable contact and capable of moving up and down together with the movable contact, the movable magnetic yoke comprising: a base disposed on the back side of the movable contact on the side opposite to the surface, the surface of the movable contact being capable of contacting the first fixed terminal... The container has a surface that contacts the second fixed terminal; a first extension that extends from the base toward the surface of the movable contact; and a second extension that is disposed at a position facing the first extension across the movable contact and extends from the base toward the surface of the movable contact. The container has two first protrusions protruding toward the first extension and two second protrusions protruding toward the second extension. The width of the top portion of the first extension in the arrangement direction of the first fixed terminal and the second fixed terminal is less than the distance between the protruding vertices of the two first protrusions in the arrangement direction. The width of the top portion of the second extension in the arrangement direction is less than the distance between the protruding vertices of the two second protrusions in the arrangement direction.

[0015] According to this structure, since the width of the top end of the first extension in the arrangement direction is less than the distance between the protruding vertices of the two first protrusions in the arrangement direction, and the width of the top end of the second extension in the arrangement direction is less than the distance between the protruding vertices of the two second protrusions in the arrangement direction, the top end of the first extension can be positioned between the protruding vertices of the two first protrusions in the arrangement direction, and the top end of the second extension can be positioned between the protruding vertices of the two second protrusions in the arrangement direction. Therefore, the first and second extensions can be positioned away from the movable and fixed contacts in the arrangement direction, which is advantageous for creating a structure where the arc generated when the movable contact separates from the fixed terminal is less likely to move towards the first and second extensions of the movable yoke.

[0016] Furthermore, due to the obstruction of the first and second protrusions, the concentration of metal vapor generated by the electric arc within the area defined by the first and second protrusions in the container is lower than that outside the area defined by the first and second protrusions. The gas temperature within the area defined by the first and second protrusions is also lower than that outside the area defined by the first and second protrusions. As a result, the movement of the electric arc toward the movable magnetic yoke located within the area defined by the first and second protrusions can be further suppressed, which is beneficial to elongating the electric arc toward the side with a larger space and can improve the arc extinguishing performance.

[0017] Effects of the utility model

[0018] According to this invention, an electromagnetic relay capable of improving arc extinguishing performance can be provided. Attached Figure Description

[0019] The accompanying drawings, which are included in and form part of this specification, illustrate exemplary embodiments, features, and aspects of the present invention together with the specification and serve to explain the principles of the present invention.

[0020] Figure 1 This is a perspective view of an electromagnetic relay according to one embodiment of the present invention.

[0021] Figure 2 It is a three-dimensional view showing the assembled state of some components such as the movable contact, the retainer, the upper yoke, and the movable yoke.

[0022] Figure 3 yes Figure 2 A top view showing the assembled state of some of the components.

[0023] Figure 4 Viewed from the right side Figure 2 The three-dimensional diagram obtained from the assembly state of some of the components shown.

[0024] Figure 5 It is a three-dimensional diagram representing a movable magnetic yoke.

[0025] Figure 6 It is a three-dimensional view showing the assembled state of the movable contact, the upper yoke, and the movable yoke.

[0026] Figure 7 yes Figure 1 The front view of the electromagnetic relay.

[0027] Figure 8 yes Figure 1 A top view of an electromagnetic relay.

[0028] Figure 9 yes Figure 7 A cross-sectional view of the electromagnetic relay.

[0029] Figure 10 yes Figure 8 BB cross-sectional view of the electromagnetic relay.

[0030] Figure 11 yes Figure 8 A cross-sectional view of an electromagnetic relay.

[0031] Explanation of reference numerals in the attached figures

[0032] 1: Electromagnetic relay; 1a: Contact device; 1b: Electromagnetic device; 10: Coil; 11: Movable iron core; 12: Shaft; 13: Return spring; 14: Coil frame; 15: Connector; 16: Spring seat; 17: Press spring; 18: Lower yoke; 19: Upper yoke; 2: Fixed terminal; 21: First fixed terminal; 211: First fixed contact; 22: Second fixed terminal; 221: Second fixed contact; 3: Movable contact; 30: Movable contact Main body; 31: First movable contact; 32: Second movable contact; 34: First protrusion; 35: Second protrusion; 4: Movable magnetic yoke; 40: Base; 41: First extension; 42: Second extension; 44, 45: Fitting holes; 5: Container; 51: First protrusion; 52: Second protrusion; 6: Upper magnetic yoke; 7: Retainer; 70: Bottom; 71: First side plate; 72: Second side plate; 8: Housing; 81: First component; 82: Second component. Detailed Implementation

[0033] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Common elements in the embodiments described below are labeled with the same reference numerals, and repeated descriptions of common elements are omitted. The following embodiments are merely one of various embodiments of the present invention. Various modifications can be made to the embodiments, depending on the design, etc., as long as the purpose of the present invention is achieved. The figures described in this invention are schematic, and the size ratios of the constituent elements in each figure are not necessarily intended to reflect actual size ratios. Furthermore, the arrows indicating directions are examples and are not intended to limit the direction of use of the electromagnetic relay 1.

[0034] (1. Summary)

[0035] This utility model relates to an electromagnetic relay, such as Figures 1 to 11As shown, the electromagnetic relay 1 includes: a container 5; a first fixed terminal 21 having a first fixed contact 211 disposed within the container 5; a second fixed terminal 22 having a second fixed contact 221 disposed within the container 5; a movable contact 3 capable of moving up and down between a first position and a second position, wherein in the first position the movable contact 3 is in contact with the first fixed contact 211 and the second fixed contact 221, and in the second position the movable contact 3 is not in contact with the first fixed contact 211 and the second fixed contact 221; and a movable magnetic yoke 4 disposed on the movable contact 3 and capable of moving up and down together with the movable contact 3. The movable magnetic yoke 4 includes: a base 40 disposed on the back side of the movable contact 3 opposite to the surface, the surface of the movable contact 3 being a surface capable of contacting the first fixed terminal 21 and the second fixed terminal 22; a first extension 41 extending from the base 40 toward the surface of the movable contact 3; and a second extension 42 disposed at a position facing the first extension 41 across the movable contact 3, extending from the base 40 toward the surface of the movable contact 3. The container 5 has two first protrusions 51 protruding toward the first extension 41 and two second protrusions 52 protruding toward the second extension 42. The tip of the first extension 41 is located between the respective protruding apexes of the two first protrusions 51 in the arrangement direction of the first fixed terminal 21 and the second fixed terminal 22, and the tip of the second extension 42 is located between the respective protruding apexes of the two second protrusions 52 in the arrangement direction.

[0036] In other words, the width W1 of the top end of the first extension 41 in the arrangement direction of the first fixed terminal 21 and the second fixed terminal 22 is less than the distance L1 between the protruding vertices of the two first protrusions 51 in the arrangement direction, and the width W2 of the top end of the second extension 42 in the arrangement direction is less than the distance L2 between the protruding vertices of the two second protrusions 52 in the arrangement direction.

[0037] In addition, the movable contact 3 is disposed below the first fixed contact 211 and the second fixed contact 221, and the upper end surface of the first extension 41 and the upper end surface of the second extension 42 are located below the surface of the movable contact 3.

[0038] In addition, the electromagnetic relay 1 also includes an upper magnetic yoke 6 disposed above the movable contact 3 and a retaining member 7 for holding the upper magnetic yoke 6. When the movable contact 3 is in the second position, the width of the first extension 41 in the arrangement direction is greater than the width of the portion of the retaining member 7 that overlaps with the first extension 41 in the arrangement direction, and the width of the second extension 42 in the arrangement direction is greater than the width of the portion of the retaining member 7 that overlaps with the second extension 42 in the arrangement direction.

[0039] (2. Detailed Structure)

[0040] Figure 1 The electromagnetic relay 1 shown is, for example, equipped in an electric vehicle. The electromagnetic relay 1, for example, switches whether current is supplied to the motor from the power source of the electric vehicle.

[0041] (2-1. Overall)

[0042] like Figures 1-2 , Figures 10-11 As shown, the electromagnetic relay 1 of this embodiment includes a contact device 1a and an electromagnet device 1b. The electromagnetic relay 1 has a housing 8, which houses the contact device 1a and the electromagnet device 1b. The contact device 1a includes a fixed terminal 2, a movable contact 3, a movable yoke 4, a container 5, an upper yoke 6, and a retaining member 7. The electromagnet device 1b causes the movable contact 3 to contact and separate from the fixed terminal 2. Specifically, the electromagnet device 1b includes a coil 10, a movable iron core 11, a shaft 12, a return spring 13, and a coil frame 14. The movable iron core 11 is connected to the shaft 12, and the shaft 12 is directly or indirectly connected to the movable contact 3. The return spring 13 applies force to the movable iron core 11 to separate the movable contact 3 from the fixed terminal 2 when the coil 10 is not energized. When the coil 10 is energized, the movable iron core 11 drives the shaft 12 to overcome the force of the return spring 13 under the electromagnetic action of the coil 10, so that the movable contact 3 contacts the fixed terminal 2.

[0043] (2-2. Shell)

[0044] like Figure 1 As shown, the housing 8 is generally rectangular in shape, forming the outer outline of the electromagnetic relay 1. The housing 8 can be formed of, for example, an insulating material such as resin. The housing 8 has a first member 81 and a second member 82. Figure 1 and Figure 10 As shown, the first component 81 is a generally rectangular tube with an opening facing downwards, covering the container 5. A through hole is provided on the upper wall of the first component 81 for the fixed terminal 2 to pass through. Near the lower ends of the plurality of sides of the first component 81, a thin-walled portion is formed with a thickness thinner than the thickness of the rest of the plurality of sides, and this thin-walled portion is inserted into the second component 82.

[0045] Furthermore, the second component 82 is a generally square-tube shape with an upward opening, and is positioned below the first component 81, with the coil 10 disposed inside the second component 82. Near the upper ends of the plurality of sides of the second component 82, a thin-walled portion is formed, thinner than the remaining thickness of the sides of the second component 82, to facilitate the insertion of the lower ends of the plurality of sides of the first component 81 into the second component 82. The first component 81 and the second component 82 can be connected by a structure such as a snap-fit, or by means of adhesive, welding, etc.

[0046] (2-3. Contact device)

[0047] The specific structure of the contact device 1a will now be described with reference to the accompanying drawings.

[0048] (2-3-1. Fixed Terminal)

[0049] like Figure 1 and Figure 10 As shown, the fixing terminal 2 includes a first fixing terminal 21 and a second fixing terminal 22. The first fixing terminal 21 and the second fixing terminal 22 are arranged in a left-right direction, with the second fixing terminal 22 located to the right of the first fixing terminal 21. The first fixing terminal 21 and the second fixing terminal 22 are formed of a conductive material such as copper. The first fixing terminal 21 and the second fixing terminal 22 are disposed through the upper wall of the housing 8 and the container 5. The first fixing terminal 21 and the second fixing terminal 22 are joined to the container 5 by means of brazing or the like, with their upper ends protruding from the upper surface of the container 5 and the upper surface of the housing 8. The first fixing terminal 21 is cylindrical with a lower surface. A first fixing contact 211 is formed at the lower end of the first fixing terminal 21. Alternatively, the first fixing contact 211 may also be mounted at the lower end of the first fixing terminal 21. The second fixing terminal 22 is cylindrical with a lower surface. A second fixing contact 221 is formed at the lower end of the second fixing terminal 22. Alternatively, the second fixed contact 221 can also be installed at the lower end of the second fixed terminal 22.

[0050] (2-3-2. Movable contact)

[0051] The movable contact 3 is formed, for example, of a conductive material such as copper. Alternatively, the movable contact 3 can be formed of a non-magnetic material. Figure 2 and Figure 3 As shown, the movable contact 3 has a movable contact body 30, a first movable contact 31, and a second movable contact 32. The movable contact body 30 is formed in a flat plate shape. The thickness direction of the movable contact body 30 is vertical. The length direction of the movable contact body 30 is horizontal.

[0052] The first movable contact 31 is formed at the left end of the upper surface of the movable contact body 30 (also referred to as the surface of the movable contact 3). That is, in this embodiment, the first movable contact 31 is a portion of the upper surface of the movable contact body 30. Alternatively, the first movable contact 31 may also be mounted at the left end of the upper surface of the movable contact body 30. The first movable contact 31 is opposite to the first fixed contact 211 in the vertical direction. More specifically, as... Figure 10 As shown, the first movable contact 31 is located below the first fixed contact 211.

[0053] The second movable contact 32 is formed at the right end of the upper surface of the movable contact body 30. That is, in this embodiment, the second movable contact 32 is a portion of the upper surface of the movable contact body 30. Alternatively, the second movable contact 32 may also be mounted at the right end of the upper surface of the movable contact body 30. The second movable contact 32 is opposite to the second fixed contact 221 in the vertical direction. More specifically, as... Figure 10 As shown, the second movable contact 32 is located below the second fixed contact 221. That is, the movable contact 3 is positioned below the first fixed contact 211 and the second fixed contact 221. It can be understood that the positional relationship between the movable contact 3 and the fixed contacts is not limited to this.

[0054] The movable contact 3 can be in the first position (not shown) and the second position (see reference). Figure 10 The movable contact 3 moves up and down between the two positions. At the first position, the movable contact 3 is in contact with the first fixed contact 211 and the second fixed contact 221. At the second position, the movable contact 3 is not in contact with the first fixed contact 211 and the second fixed contact 221.

[0055] In addition, the movable contact 3 also has a first protrusion 34 and a second protrusion 35 protruding from the lower surface of the movable contact body 30 (also referred to as the back surface of the movable contact 3). Figure 10 As shown, the first protrusion 34 and the second protrusion 35 are arranged in a left-right direction, with the second protrusion 35 located to the right of the first protrusion 34.

[0056] (2-3-3. Movable magnetic yoke)

[0057] The movable magnetic yoke 4 is formed, for example, from a magnetic material such as electromagnetic soft iron or SPCC (Steel Plate Cold Commercial). The permeability of the movable magnetic yoke 4 is higher than that of the movable contact 3. Figure 5 As shown, the movable magnetic yoke 4 has a base 40, a first extension 41, and a second extension 42. Figure 5 and Figure 6 As shown, the base 40 is located below the movable contact 3. Specifically, the base 40 is provided on the lower surface of the movable contact 3 (i.e., the back surface of the movable contact 3), and the back surface of the movable contact 3 is located on the side opposite to the surface of the movable contact 3. The surface of the movable contact 3 (specifically, the first movable contact 31 and the second movable contact 32 provided on the surface of the movable contact 3) can contact the first fixed terminal 21 and the second fixed terminal 22.

[0058] like Figure 6As shown, the first extension 41 extends from the base 40 (e.g., the front end of the base 40) toward the surface of the movable contact 3. The second extension 42 extends from the base 40 (e.g., the rear end of the base 40) toward the surface of the movable contact 3. The first extension 41 and the second extension 42 are opposite to each other in the front-rear direction and have length in the left-right direction. In other words, the second extension 42 is provided at a position facing the first extension 41 across the movable contact 3.

[0059] Preferably, the upper end face of the first extension 41 and the upper end face of the second extension 42 are located below the surface (i.e., the upper surface) of the movable contact 3.

[0060] like Figure 5 As shown, the base 40 has a fitting hole 44 and a fitting hole 45. By inserting the first protrusion 34 of the movable contact 3 into the fitting hole 44 and the second protrusion 35 of the movable contact 3 into the fitting hole 45, the movable magnetic yoke 4 is engaged with the movable contact 3. That is, the movable magnetic yoke 4 is fixed to the movable contact 3 and can move up and down together with the movable contact 3.

[0061] (2-3-4. Container)

[0062] The material of container 5 is a heat-resistant material such as ceramic. In other words, container 5 can be formed, for example, of insulating materials such as ceramic, glass, or resin, or metals such as stainless steel, or a combination of metals and insulating materials. Figure 10 As shown, the container 5 is box-shaped with an open lower surface, for example, a roughly rectangular tube opening downwards. The container 5 is disposed within the housing 8. A through hole for the fixed terminal 2 to pass through is also provided on the top surface of the container 5 at a position corresponding to the through hole provided in the first member 81. The first fixed contact 211, the second fixed contact 221, and the movable contact 3 are housed within the internal space of the container 5. That is, the first fixed contact 211, the second fixed contact 221, and the movable contact 3 are disposed within the container 5. An arc-quenching gas such as hydrogen is sealed within the internal space of the container 5. Alternatively, the internal space of the container 5 may not be sealed, for example, it may be connected to the external environment.

[0063] like Figure 9As shown, the container 5 has two first protrusions 51 protruding toward the first extension 41 and two second protrusions 52 protruding toward the second extension 42. Specifically, the two first protrusions 51 are arranged in the left-right direction near the center of the inner surface of the front sidewall of the container 5 and protrude toward the first extension 41 in the front-rear direction. The two second protrusions 52 are arranged in the left-right direction near the center of the inner surface of the rear sidewall of the container 5 and protrude toward the second extension 42 in the front-rear direction. The first protrusions 51 and the second protrusions 52 are used to limit undesirable rotational movements that occur when the movable contact 3 moves up and down.

[0064] like Figure 9 As shown, the protrusion height in the front-rear direction of the right first protrusion 51 is greater than that of the left first protrusion 51, and the protrusion height in the front-rear direction of the right second protrusion 52 is greater than that of the left second protrusion 52. Therefore, the right first protrusion 51 can be used to restrict rotation of the movable contact 3 in one direction (i.e., clockwise rotation when viewed from above), and the right second protrusion 52 can be used to restrict rotation of the movable contact 3 in the other direction (i.e., counterclockwise rotation when viewed from above). Of course, this is not a limitation. The protrusion height in the front-rear direction of the left first protrusion 51 can be greater than that of the right first protrusion 51, and the protrusion height in the front-rear direction of the left second protrusion 52 can be greater than that of the right second protrusion 52. Alternatively, the protrusion heights in the front-rear direction of the two first protrusions 51 can be the same, and the protrusion heights in the front-rear direction of the two second protrusions 52 can also be the same.

[0065] like Figure 9 As shown, the top end of the first extension 41 is located between the protruding vertices of the two first protrusions 51 in the left-right direction (i.e., the arrangement direction of the first fixed terminal 21 and the second fixed terminal 22), and the top end of the second extension 42 is located between the protruding vertices of the two second protrusions 52 in the left-right direction. In other words, the width W1 of the top end of the first extension 41 in the left-right direction is less than the distance L1 between the protruding vertices of the two first protrusions 51 in the left-right direction, and the width W2 of the top end of the second extension 42 in the left-right direction is less than the distance L2 between the protruding vertices of the two second protrusions 52 in the left-right direction.

[0066] (2-3-5. Upper Magnetic Yoke)

[0067] like Figures 2-4 , Figure 6 As shown, the upper magnetic yoke 6 is positioned above the movable contact 3. The upper magnetic yoke 6 is formed of a magnetic material. An example of a magnetic material is a soft iron magnet or SPCC (Steel Plate Cold Commercial). The shape of the upper magnetic yoke 6 is, for example, a cuboid.

[0068] (2-3-6. Retaining components)

[0069] like Figure 2 and Figure 4 As shown, the retainer 7 has a bottom 70, a first side plate 71, and a second side plate 72. The bottom 70 is a generally rectangular plate. The first side plate 71 protrudes upward from the left and right portions of the front end of the bottom 70, and the second side plate 72 protrudes upward from the left and right portions of the rear end of the bottom 70. The upper ends of the first side plate 71 and the second side plate 72 are located above the upper surface of the movable contact 3. The upper ends of the first side plate 71 and the second side plate 72 are connected to the upper yoke 6 by means of welding or the like. That is, the upper yoke 6 is held by the retainer 7.

[0070] The first side plate 71 is located in front of the first extension 41 of the movable magnetic yoke 4, and partially overlaps with the first extension 41 in the front-back direction. The second side plate 72 is located in rear of the second extension 42 of the movable magnetic yoke 4, and partially overlaps with the second extension 42 in the front-back direction.

[0071] Preferably, such as Figure 2 As shown, when the movable contact 3 is in the second position, the width of the first extension 41 in the left-right direction is greater than the width of the portion of the first side plate 71 that overlaps with the first extension 41 in the left-right direction, and the width of the second extension 42 in the left-right direction is greater than the width of the portion of the second side plate 72 that overlaps with the second extension 42 in the left-right direction.

[0072] The retainer 7 is formed, for example, of a non-magnetic metallic material. The retainer 7 is preferably formed from a single component; for example, the bottom 70, the first side plate 71, and the second side plate 72 are formed by bending a single sheet of non-magnetic metallic material. It is understood that the retainer 7 does not necessarily have to be formed from a single component. For example, the bottom 70 could be made of metal, and the first side plate 71 and the second side plate 72 could be made of resin.

[0073] (2-4. Electromagnetic Device)

[0074] The specific structure of the electromagnet device 1b will now be described with reference to the accompanying drawings.

[0075] like Figure 10As shown, the coil 10 is positioned inside the housing 8 but outside the container 5. Specifically, the coil 10 is wound in a cylindrical shape around the outer periphery of the hollow cylindrical portion of the coil holder 14. A movable iron core 11 capable of moving up and down is disposed on the inner periphery of the hollow cylindrical portion of the coil holder 14. An upwardly protruding shaft 12 is fixed at the center of the movable iron core 11.

[0076] Additionally, lower yokes 18 are arranged below and on both sides of the coil frame 14, and the lower yokes 18 are roughly C-shaped, opening upwards and to the front and rear sides. An upper yoke 19 is fixed to the upper end of the lower yoke 18, and the lower yokes 18 and the upper yoke 19 together form a magnetic circuit through which the magnetic field generated by the coil 10 passes. A connector 15 is fixed between the upper yoke 19 and the container 5 by means of soldering or the like, connecting the two. Furthermore, a return spring 13 is installed between the upper yoke 19 and the movable iron core 11 to push the movable iron core 11 downwards and reset the movable iron core 11.

[0077] The upper end of the shaft 12 extends into the container 5 through a through hole formed in the center of the upper yoke 19. A spring seat 16 is fixed to the upper end of the shaft 12, and the movable contact 3 is held in place by means of a retainer 7. Furthermore, a compression spring 17 is installed between the spring seat 16 and the movable contact 3 to ensure the contact pressure between the movable contact 3 and the first fixed contact 211 and the second fixed contact 221.

[0078] When coil 10 is energized, the movable iron core 11, under the influence of the magnetic field generated by coil 10, drives shaft 12 and movable contact 3 to move upward. This causes movable contact 3 to contact the first fixed contact 211 and the second fixed contact 221, establishing electrical continuity between the first fixed terminal 21 and the second fixed terminal 22. After movable contact 3 contacts the first fixed contact 211 and the second fixed contact 221, movable iron core 11 drives shaft 12 to continue moving upward, further compressing the compression spring 17 and applying contact pressure to movable contact 3 towards the first fixed contact 211 and the second fixed contact 221. When the energizing of the coil 10 is stopped, the movable iron core 11 drives the shaft 12 and the movable contact 3 to move downward under the elastic restoring force of the return spring 13. As a result, the movable contact 3 separates from the first fixed contact 211 and the second fixed contact 221, so that the first fixed terminal 21 and the second fixed terminal 22 are in an open state.

[0079] It should be noted that, in Figures 1 to 11In this application, the direction orthogonal to both the left-right and up-down directions is defined as the front-back direction. However, "left-right direction" refers only to the arrangement direction of the first fixed terminal 21 and the second fixed terminal 22. "Up-down direction" refers only to the movement direction of the movable contact 3. "Front-back direction" refers only to the direction orthogonal to both the arrangement direction of the first fixed terminal 21 and the second fixed terminal 22 and the movement direction of the movable contact 3. The description of "left-right direction," "up-down direction," and "front-back direction" in this application is not intended to limit the direction of use of the electromagnetic relay 1.

Claims

1. An electromagnetic relay, characterized in that, The electromagnetic relay includes: container; The first fixed terminal has a first fixed contact disposed within the container; The second fixed terminal has a second fixed contact disposed within the container; A movable contact, capable of moving vertically between a first position and a second position, wherein in the first position, the movable contact is in contact with both the first and second fixed contacts, and in the second position, the movable contact is not in contact with either the first or second fixed contacts; and A movable magnetic yoke is disposed on the movable contact and can move up and down together with the movable contact. The movable magnetic yoke includes: The base is located on the back side of the movable contact opposite to the surface, and the surface of the movable contact is a surface that can contact the first fixed terminal and the second fixed terminal; A first extension portion, which extends from the base toward the surface of the movable contact; and The second extension is located at a position facing the first extension across the movable contact, and extends from the base toward the surface of the movable contact. The container has two first protrusions protruding toward the first extension and two second protrusions protruding toward the second extension. The top end of the first extension is located between the protruding apexes of the two first protrusions in the arrangement direction of the first fixed terminal and the second fixed terminal. The top end of the second extension is located between the respective protruding vertices of the two second protrusions in the arrangement direction.

2. The electromagnetic relay according to claim 1, characterized in that, The movable contact is positioned below the first fixed contact and the second fixed contact. The upper surfaces of the first extension and the second extension are located below the surface of the movable contact.

3. The electromagnetic relay according to claim 1 or 2, characterized in that, The electromagnetic relay further includes an upper magnetic yoke disposed above the movable contact, and a retaining member for holding the upper magnetic yoke. When the movable contact is in the second position The width of the first extension in the arrangement direction is greater than the width of the portion of the retainer that overlaps with the first extension in the arrangement direction. The width of the second extension in the arrangement direction is greater than the width of the portion of the retainer that overlaps with the second extension in the arrangement direction.

4. An electromagnetic relay, characterized in that, The electromagnetic relay includes: container; The first fixed terminal has a first fixed contact disposed within the container; The second fixed terminal has a second fixed contact disposed within the container; A movable contact, capable of moving vertically between a first position and a second position, wherein in the first position, the movable contact is in contact with both the first and second fixed contacts, and in the second position, the movable contact is not in contact with either the first or second fixed contacts; and A movable magnetic yoke is disposed on the movable contact and can move up and down together with the movable contact. The movable magnetic yoke includes: The base is located on the back side of the movable contact opposite to the surface, and the surface of the movable contact is a surface that can contact the first fixed terminal and the second fixed terminal; A first extension portion, which extends from the base toward the surface of the movable contact; and The second extension is located at a position facing the first extension across the movable contact, and extends from the base toward the surface of the movable contact. The container has two first protrusions protruding toward the first extension and two second protrusions protruding toward the second extension. The width of the top end of the first extension in the arrangement direction of the first fixed terminal and the second fixed terminal is less than the distance between the protruding vertices of the two first protrusions in the arrangement direction. The width of the top end of the second extension in the arrangement direction is less than the distance between the protruding vertices of the two second protrusions in the arrangement direction.

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