An electromagnetic relay

Abstract

The invention discloses an electromagnetic relay, comprising a magnetic circuit part, a contact part, a push card and a base; the magnetic circuit part and the contact part are respectively mounted on the base; the contact part comprises a moving spring part and a static spring part; the push card is connected between the magnetic circuit part and the moving spring part; the static spring part comprises a static spring sheet and a static contact connected to one end of the static spring sheet; the moving spring part comprises a moving spring sheet, a moving contact connected to one end of the moving spring sheet and a moving spring lead-out sheet connected to the other end of the moving spring sheet; the moving contact and the static contact are in a matching position; in one end of the static spring sheet, at the peripheral position of the static spring sheet corresponding to the static contact, a sheet body made of soft magnetic material is also installed. The invention can improve the electrical life of the product without increasing the volume and cost of the relay product through structural improvement.

Description

Technical Field

[0001] The present invention relates to the technical field of relays, and in particular to an electromagnetic relay. Background Art

[0002] A relay is an electronic control device that has a control system (also known as an input circuit) and a controlled system (also known as an output circuit). It is usually used in automatic control circuits. It is actually an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays the role of automatic adjustment, safety protection, and circuit conversion in the circuit. Electromagnetic relays usually include a magnetic circuit part, a contact part, a driving mechanism, and a base. The magnetic circuit part is generally composed of two basically symmetrical magnetic circuits, including a static magnetic conductive part, a movable magnetic conductive part, and a coil. The contact part includes a moving spring part and a static spring part. The driving mechanism is generally played by a driving card. When the relay coil is connected to a positive pulse voltage, the magnetic circuit part works, and the driving block pushes the moving spring part to make the moving and static contacts contact, and the relay is activated. When the coil is connected to a reverse pulse voltage, the magnetic circuit part works, and the driving block pushes the moving spring part to disconnect the moving and static contacts, and the relay is reset. Electrical life is the main core performance indicator of electromagnetic relays. In the prior art, due to the increase in load voltage, in the absence of any arc extinguishing means, the direction of the arc in the relay is uncontrollable, and the arc continues to burn for a long time, which will increase the temperature of the contact part of the relay and cause the card to melt, thereby reducing the contact life and the service life of the relay. If the arc continues to burn, it will also carbonize the base plastic and affect the voltage resistance of the relay. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide an electromagnetic relay which, through structural improvement, can increase the electrical life of the product without increasing the volume and cost of the relay product.

[0004] The technical solution adopted by the present invention to solve the technical problem is: an electromagnetic relay, comprising a magnetic circuit part, a contact part, a push card and a base; the magnetic circuit part and the contact part are respectively installed on the base; the contact part comprises a moving spring part and a static spring part; the push card is connected between the magnetic circuit part and the moving spring part; the static spring part comprises a static spring sheet and a static contact connected to one end of the static spring sheet; the moving spring part comprises a moving spring sheet, a moving contact connected to one end of the moving spring sheet and a moving spring lead-out sheet connected to the other end of the moving spring sheet; the moving contact and the static contact are in a matching position; in one end of the static spring sheet, a sheet body made of soft magnetic material is also installed at a peripheral position of the static spring sheet corresponding to the static contact, so that the sheet body made of soft magnetic material is magnetized by using the annular magnetic field generated when the current of the moving and static contacts passes through, so that the sheet body made of soft magnetic material is magnetized to form a new magnetic field, and the magnetic field of the sheet body made of soft magnetic material is used to achieve arc initiation and arc extinguishing of the arc generated between the moving and static contacts.

[0005] There are two sheets made of soft magnetic material, which are respectively installed on two sides of the static contact point corresponding to the width or length of the static spring sheet.

[0006] The two sheets made of soft magnetic materials have the same size.

[0007] The two sheets made of soft magnetic material are symmetrically mounted on both sides of the static contact along the length or width direction of the static spring sheet.

[0008] The center lines of the two sheets made of soft magnetic material do not coincide with the center line of the static contact.

[0009] The length of the sheet made of the soft magnetic material is substantially the same as the diameter of the static contact.

[0010] The height dimension of the sheet body made of the soft magnetic material is substantially the same as the protruding dimension of the static contact on the static spring sheet.

[0011] The static spring sheet is provided with an insertion hole for inserting the sheet body made of soft magnetic material. The bottom end of the sheet body made of soft magnetic material is integrally connected with a clamp head whose length and / or thickness is greater than that of the sheet body made of soft magnetic material. The clamp head is against the edge of the hole at one end of the insertion hole on the side of the static spring sheet facing away from the static contact point and is fixed to the static spring sheet by welding.

[0012] A sinking groove is also provided at the edge of the hole at one end of the jack, and the clamp head is adapted to fit in the sinking groove.

[0013] The static spring sheet is a copper sheet, and the sheet body made of soft magnetic material is an iron sheet.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. The present invention adopts a sheet body made of soft magnetic material installed in one end of the static spring sheet, at the peripheral position of the static spring sheet corresponding to the static contact, so that the sheet body made of soft magnetic material is magnetized by the annular magnetic field generated when the current passes through the dynamic and static contacts, so that the sheet body made of soft magnetic material is magnetized to form a new magnetic field, and the magnetic field of the sheet body made of soft magnetic material is used to start and extinguish the arc generated between the dynamic and static contacts. The structure of the present invention arranges a sheet body made of soft magnetic material around the static contact. When the contact is disconnected, the arc current generates a magnetic field around the contact, so that the sheet body made of soft magnetic material is magnetized and polarized. The polarity of the sheet body made of soft magnetic material is then used to achieve the effect of arc striking, thereby shortening the arc burning time of the arc during the electrical life and reducing the temperature rise of the contact head. At the same time, if the force generated by the sheet body made of soft magnetic material is large enough, the arc can be elongated when it is drawn to the sheet body made of soft magnetic material, thereby achieving the purpose of rapid extinguishing. If it is not large enough, the arc can be moved in the direction of the force, making the arc controllable from uncontrollable, thereby avoiding burning of the base or pushing the card, reducing the carbonization of the arc to the plastic part, and improving the pressure resistance after the life.

[0016] 2. The present invention adopts a sheet body made of soft magnetic material arranged around the static contact, and the height of the sheet body made of soft magnetic material is roughly the same as the protruding size of the static contact on the static spring sheet. The distance is short, and the arc is easier to move past, which means that the speed of arc movement is accelerated.

[0017] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments; however, the electromagnetic relay of the present invention is not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the exploded three-dimensional structure of an embodiment of the present invention;

[0019] Figure 2 is a structural cross-sectional view of an embodiment of the present invention;

[0020] Figure 3 It is a schematic diagram of the coordination of the static spring sheet and the sheet body made of soft magnetic material in an embodiment of the present invention;

[0021] Figure 4 It is a schematic diagram of magnetization of a sheet made of soft magnetic material according to an embodiment of the present invention (the direction of current is inward along the paper surface of the drawing);

[0022] Figure 5 It is a schematic diagram of arc initiation achieved by a sheet made of soft magnetic material in an embodiment of the present invention (the current direction is inward along the paper surface of the drawing);

[0023] Figure 6 It is a schematic diagram of magnetization of a sheet made of soft magnetic material according to an embodiment of the present invention (the direction of current is outward along the paper surface of the drawing);

[0024] Figure 7 It is a schematic diagram of arc initiation achieved by a sheet made of soft magnetic material according to an embodiment of the present invention (the direction of current is outward along the paper surface of the drawing). DETAILED DESCRIPTION

[0025] Example

[0026] See also Figures 1 to 3 As shown, an electromagnetic relay of the present invention comprises a magnetic circuit part 1, a contact part, a push card 4, a base 5 and a housing 7; the magnetic circuit part 1 and the contact part are respectively mounted on the base 5; the contact part comprises a moving spring part 2 and a static spring part 3; the push card 4 is connected between the magnetic circuit part 1 and the moving spring part 2; the static spring part 3 comprises a static spring piece 31 and a static contact 32 connected to one end of the static spring piece 31; the moving spring part 2 comprises a moving spring piece 21, a moving contact 22 connected to one end of the moving spring piece 21 and a moving contact 32 connected to the other end of the moving spring piece 21 The moving contact 22 and the static contact 32 are in matching positions; in one end of the static spring piece 31, at the peripheral position of the static spring piece 31 corresponding to the static contact 32, a sheet body 6 made of soft magnetic material is also installed, so as to utilize the annular magnetic field generated when the moving and static contact current passes through to magnetize the sheet body 6 made of soft magnetic material, so that the sheet body 6 made of soft magnetic material is magnetized to form a new magnetic field, and utilize the magnetic field of the sheet body 6 made of soft magnetic material to achieve arc initiation and arc extinguishing of the arc generated between the moving and static contacts.

[0027] In this embodiment, there are two sheets 6 made of soft magnetic material, which are respectively installed on two sides of the static contact corresponding to the width of the static spring sheet 31.

[0028] In this embodiment, the magnetic circuit part 1 includes an iron core 11, a coil frame 12, a yoke 13 and an armature 14. The iron core 11 is inserted into the through hole of the winding shaft of the coil frame 12, and each side of the two L-shaped yokes 13 is respectively fixed to the corresponding end of the iron core 11; the armature 14 is an I-shaped structure and is respectively matched with the other sides of the two L-shaped yokes 13. The armature 14 is provided with a pushing arm 141, one end of the pushing card 4 is matched with the pushing arm 141 of the armature 14, and the other end of the pushing card 4 is matched with one end (i.e., the free end) of the moving spring 21.

[0029] In this embodiment, the two sheets 6 made of soft magnetic material have the same size.

[0030] In this embodiment, the two sheets 6 made of soft magnetic material are symmetrically mounted on both sides of the static contact 32 along the length direction of the static spring sheet 31 .

[0031] In this embodiment, the center lines of the two sheets 6 made of soft magnetic material do not coincide with the center line of the static contact 32 .

[0032] In this embodiment, the length of the sheet 6 made of soft magnetic material is substantially the same as the diameter of the static contact 32 .

[0033] In this embodiment, the height dimension of the sheet body 6 made of soft magnetic material is substantially the same as the protruding dimension of the static contact 32 on the static spring sheet 31 .

[0034] In this embodiment, the static spring 31 is provided with two insertion holes 311 for respectively inserting two sheets 6 made of soft magnetic material. The bottom end of the sheet 6 made of soft magnetic material is integrally connected with a clamp 61 whose length and / or thickness is greater than that of the sheet made of soft magnetic material. The clamp 61 is pressed against the edge of the hole at one end of the insertion hole 311 on the side of the static spring sheet 31 facing away from the static contact 32. A depression groove 312 is also provided at the edge of the hole at one end of the insertion hole 311. The clamp 61 is adapted in the depression groove 312 and is fixed to the static spring sheet 31 by welding.

[0035] In this embodiment, the static spring sheet 31 is a copper sheet, and the sheet body 6 made of soft magnetic material is an iron sheet.

[0036] See also Figures 4 to 7 As shown, an electromagnetic relay of the present invention generates a circular magnetic field M1 (such as Figure 4 As shown in FIG. 1 , the iron sheets (electrical pure iron) above and below the static contact 32 are magnetized under the action of the magnetic field, so that the two ends of the iron sheet 6 produce NS polarity, and the magnetic lines of force generated by the iron sheet are as shown in FIG. Figure 5 As shown in the figure; when the contacts are disconnected and an arc is generated, the force F1 of the magnetic field M2 generated by the two iron sheets is in the up and down directions respectively, and produces an arc-starting effect on the arc. Similarly, when the current direction is outward along the paper surface of the drawing, a circular magnetic field M2 (such as Figure 6 As shown in FIG. 1 , the iron sheets (electrical pure iron) above and below the static contact 32 are magnetized under the action of the magnetic field, so that the two ends of the iron sheet 6 produce NS polarity, and the magnetic lines of force generated by the iron sheet are as shown in FIG. Figure 7 As shown in the figure, when the contacts are disconnected and an arc is generated, the force F2 of the magnetic field M2 generated by the two iron sheets is also in the up and down directions, and has an arc-starting effect on the arc. Because the contacts will burn during the electrical life process and the arc shape is irregular, the force of the arc is roughly inclined upward and downward.

[0037] An electromagnetic relay of the present invention adopts an iron sheet 6 installed at one end of a static reed sheet 31, on both sides of the width of the static reed sheet 31 and at a position corresponding to a static contact 32, so as to magnetize the iron sheet 6 by utilizing the annular magnetic field generated when the current passes through the moving and static contacts, so that the iron sheet 6 is magnetized to form a new magnetic field, and the magnetic field of the iron sheet 6 is utilized to strike and extinguish the arc generated between the moving and static contacts. The structure of the present invention arranges iron sheets 6 on both sides of the static contact 32. When the contact is disconnected, the arc current generates a magnetic field around the contact, so that the iron sheet 6 is magnetized and polarized. The polarity of the iron sheet 6 is then used to achieve the arc-starting effect, thereby shortening the arc burning time of the arc during the electrical life and reducing the temperature rise of the contact head. At the same time, if the force generated by the sheet body made of soft magnetic material is large enough, the arc can be elongated when it is directed to the iron sheet 6, so as to achieve the purpose of rapid extinguishing. If it is not large enough, the arc can be moved in the direction of the force, so that the arc changes from uncontrollable to controllable, thereby avoiding the burning of the base or the push card, reducing the carbonization of the arc to the plastic parts, and improving the pressure resistance after the life.

[0038] An electromagnetic relay of the present invention adopts an iron sheet 6 arranged around the static contact 32, and the height of the iron sheet 6 is substantially the same as the protruding dimension of the static contact 32 on the static spring sheet 31. The short distance makes it easier for the arc to move past, which means that the speed of the arc movement is accelerated.

[0039] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above, or modify it into an equivalent equivalent embodiment without departing from the scope of the technical solution of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. An electromagnetic relay, comprising a magnetic circuit part, a contact part, a push card and a base; the magnetic circuit part and the contact part are respectively mounted on the base; the contact part comprises a movable spring part and a static spring part; the push card is connected between the magnetic circuit part and the movable spring part; the static spring part comprises a static spring sheet and a static contact connected to one end of the static spring sheet; the movable spring part comprises a movable spring sheet, a movable contact connected to one end of the movable spring sheet and a movable spring lead-out sheet connected to the other end of the movable spring sheet; the movable contact and the static contact are in a matching position; characterized in that: At one end of the static spring sheet connected to the static contact, a sheet body made of soft magnetic material is also installed at a peripheral position of the static spring sheet corresponding to the static contact, so that the annular magnetic field generated when the current passes through the moving and static contacts is used to magnetize the sheet body made of soft magnetic material, so that the sheet body made of soft magnetic material is magnetized to form a new magnetic field, and the magnetic field of the sheet body made of soft magnetic material generates a force toward the sheet body to achieve arc initiation and arc extinguishing of the arc generated between the moving and static contacts.

2. The electromagnetic relay according to claim 1, characterized in that: Two sheets made of soft magnetic material are respectively arranged on two sides of the static contact corresponding to the width or length of the static spring sheet.

3. The electromagnetic relay according to claim 2, characterized in that: The two sheets made of soft magnetic materials have the same size.

4. The electromagnetic relay according to claim 3, characterized in that: The two sheets made of soft magnetic material are symmetrically mounted on both sides of the static contact along the length or width direction of the static spring sheet.

5. The electromagnetic relay according to claim 3, characterized in that: The center lines of the two sheets made of soft magnetic material do not coincide with the center line of the static contact.

6. The electromagnetic relay according to claim 1, 2, 3 or 4, characterized in that: The length of the sheet made of the soft magnetic material is substantially the same as the diameter of the static contact.

7. The electromagnetic relay according to claim 1, 2, 3 or 4, characterized in that: The height dimension of the sheet body made of the soft magnetic material is substantially the same as the protruding dimension of the static contact on the static spring sheet.

8. The electromagnetic relay according to claim 1, characterized in that: The static spring sheet is provided with an insertion hole for inserting the sheet body made of soft magnetic material. The bottom end of the sheet body made of soft magnetic material is integrally connected with a clamp head whose length and / or thickness is greater than that of the sheet body made of soft magnetic material. The clamp head is against the edge of the hole at one end of the insertion hole on the side of the static spring sheet facing away from the static contact point and is fixed to the static spring sheet by welding.

9. The electromagnetic relay according to claim 8, characterized in that: A sinking groove is also provided at the edge of the hole at one end of the jack, and the clamp head is adapted to fit in the sinking groove.

10. The electromagnetic relay according to any one of claims 1 to 5, 8 to 9, characterized in that: The static spring sheet is a copper sheet, and the sheet body made of soft magnetic material is an iron sheet.

11. The electromagnetic relay according to claim 6, characterized in that: The static spring sheet is a copper sheet, and the sheet body made of soft magnetic material is an iron sheet.

12. The electromagnetic relay according to claim 7, characterized in that: The static spring sheet is a copper sheet, and the sheet body made of soft magnetic material is an iron sheet.

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