CN215869154U - Magnetic circuit part capable of improving initial electromagnetic attraction and high-voltage direct-current relay - Google Patents

Abstract

The utility model discloses a magnetic circuit part capable of improving initial electromagnetic attraction and a high-voltage direct-current relay, wherein the magnetic circuit part comprises a coil, a movable magnetizer and a static magnetizer; the coil, the movable magnetizer and the static magnetizer are respectively arranged at the matched positions, so that the magnetic pole surfaces of the movable magnetizer and the static magnetizer are in opposite positions; the magnetic circuit portion further includes a projection member slidably fitted at a position of one of the members corresponding to the magnetic pole face, and projecting from the magnetic pole face of the one of the members in a direction toward the magnetic pole face of the other of the members in a state where the movable magnetic conductor is not moved, and moving in a direction opposite to the projecting direction after the movable magnetic conductor is moved to abut the magnetic pole faces of the two members. The utility model can improve the initial electromagnetic attraction under the condition of the same coil volume and power consumption; or the coil volume and the coil power consumption are reduced under the same initial electromagnetic attraction.

Description

Magnetic circuit part capable of improving initial electromagnetic attraction and high-voltage direct-current relay

Technical Field

The utility model relates to the technical field of relays, in particular to a magnetic circuit part capable of improving initial electromagnetic attraction and a high-voltage direct-current relay.

Background

A relay is an electronic control device having a control system (also called an input loop) and a controlled system (also called an output loop), which is commonly used in automatic control circuits, and which is actually an "automatic switch" that uses a small current to control a large current. Therefore, the circuit plays the roles of automatic regulation, safety protection, circuit conversion and the like. The high-voltage direct-current relay is a relay with the capacity of processing high power, has the characteristics of incomparable reliability and long service life and the like of a conventional relay under the harsh conditions of high voltage, large current and the like, and is widely applied to various fields, such as the field of new energy automobiles and the like.

On one hand, as the endurance mileage of the new energy automobile is required to be increased, the battery capacity is higher, and the short-circuit current when the battery pack is in short circuit is also higher, so that the high-voltage direct-current relay is required to have stronger short-circuit resistance; on the other hand, the high-voltage direct-current relay is also required to have smaller and smaller power consumption so as to reduce energy loss; the requirement on the riding space of the new energy automobile is increasingly greater, and the requirement on the volume of the high-voltage direct-current relay is increasingly smaller. In general, the high-voltage direct-current relay applied to the fields of new energy automobiles and the like is required to have: strong electromagnetic attraction, low driving power consumption and small volume. However, in the prior art, the strong electromagnetic attraction force required for short circuit resistance requires a large coil winding space and coil driving power consumption of the relay, which are contradictory to the small size and low power consumption of the relay coil, and therefore, the application of the high-voltage direct-current relay in the prior art in the fields of new energy automobiles and the like is affected.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provides a magnetic circuit part and a high-voltage direct-current relay capable of improving initial electromagnetic attraction, and the initial electromagnetic attraction can be improved under the condition of the same coil volume and power consumption through structural improvement; or the coil volume and the coil power consumption are reduced under the same initial electromagnetic attraction.

The technical scheme adopted by the utility model for solving the technical problems is as follows: a magnetic circuit part capable of improving initial electromagnetic attraction force comprises a coil, a movable magnetizer and a static magnetizer; the coil, the movable magnetizer and the static magnetizer are respectively arranged at the matched positions so as to enable the magnetic pole surface of the movable magnetizer and the magnetic pole surface in the static magnetizer to be at opposite positions with preset magnetic gaps, and the movable magnetizer is attracted to the static magnetizer when the coil is electrified; the magnetic circuit portion further includes a projection member slidably fitted at a position corresponding to the magnetic pole surface of one of the movable magnetizer and the stationary magnetizer, and projecting from the magnetic pole surface of the one member toward the magnetic pole surface of the other member in a state where the movable magnetizer is not moved, so that a magnetic gap between the magnetic pole surfaces of the two members becomes smaller at the position of the projection member, thereby enabling to reduce the magnetic resistance, to promote an initial electromagnetic attraction force, and to move in a direction opposite to the projecting direction after the movable magnetizer is moved to make the projection member of the one member abut against the magnetic pole surface of the other member, thereby ensuring that the magnetic pole surfaces of the two members are attracted in place.

The convex part is of a block structure with a convex part, and a sliding groove is arranged at the position, corresponding to the magnetic pole surface, of one of the movable magnetizer and the static magnetizer; the convex part of the block structure is slidably matched in the sliding groove of one of the movable magnetizer and the static magnetizer, and the convex part of the convex part protrudes from the magnetic pole surface of the one part to the magnetic pole surface of the other part.

The block structure with the protruding portion and the sliding groove are provided with first step structures which are matched with each other, the protruding portion of the protruding portion component is limited to move towards the direction of the magnetic pole face of the other component by the first step structures, and therefore a certain gap is formed between the protruding portion of the protruding portion component of one component and the magnetic pole face of the other component when the movable magnetizer is not moved.

The block structure with the protruding part is one or more than two, and the sliding groove of one of the two parts of the movable magnetizer and the static magnetizer is one or more than two corresponding to the sliding groove.

The protruding part is an annular part which is slidably matched with the outer periphery of one of the movable magnetizer and the static magnetizer, and one end of the annular part protrudes from the magnetic pole surface of the one part to the magnetic pole surface of the other part.

And a convex edge structure which is matched with each other is arranged between the other end of the annular piece and the outer periphery of one of the movable magnetizer and the static magnetizer, and the convex edge structure limits one end of the annular piece to move towards the magnetic pole surface of the other part so as to ensure that a certain gap is formed between one end of the annular piece and the magnetic pole surface of the other part when the movable magnetizer is not moved.

One of the two parts of the movable magnetizer and the static magnetizer is the movable magnetizer, the convex part can be matched on the movable magnetizer in a sliding way, and the movable magnetizer is a movable iron core.

One of the two parts of the movable magnetizer and the static magnetizer is the static magnetizer, the convex part can be matched on the static magnetizer in a sliding way, and the static magnetizer is a yoke iron plate.

One of the two parts of the movable magnetizer and the static magnetizer is the static magnetizer, the convex part can be matched on the static magnetizer in a sliding way, and the static magnetizer is a static iron core.

A high-voltage direct-current relay comprises the magnetic circuit part capable of improving initial electromagnetic attraction.

Compared with the prior art, the utility model has the beneficial effects that:

the utility model adopts the magnetic circuit part and is also provided with a convex part which is matched at the position of one part of the movable magnetizer and the static magnetizer corresponding to the magnetic pole surface in a sliding way, the convex part protrudes from the magnetic pole surface of the one part to the magnetic pole surface of the other part when the movable magnetizer is not moved, and the convex part moves to the opposite direction after the movable magnetizer moves to ensure that the convex part of the one part is abutted against the magnetic pole surface of the other part. According to the structure, in the first aspect, the protruding part protrudes from the magnetic pole surface of one part to the magnetic pole surface of the other part, so that the magnetic gap between the magnetic pole surfaces of the two parts is reduced at the position of the protruding part, and therefore the magnetic resistance can be reduced, the initial electromagnetic attraction force can be improved, or the coil volume can be reduced and the coil power consumption can be reduced under the same initial electromagnetic attraction force; the utility model can ensure that the magnetic pole surfaces of the two parts are attracted in place by utilizing the fact that the protruding part can move in the opposite direction of the protruding part. In the second aspect, the receding space is not required to be arranged in the suction process of the movable magnetizer and the static magnetizer, and the receding space can be arranged in the gap direction of the movable magnetizer and the static magnetizer to generate the suction force from the movable magnetizer to the static magnetizer. In the third aspect, according to the matching of the suction counterforce, when the protruding height of the convex part is required to be designed, the convex part is movable, so that the whole movable magnetizer (movable iron core) or the whole static magnetizer (static iron core or yoke iron plate) is not required to be replaced in the design stage, and the design cost and the process are reduced.

The utility model is further explained in detail with the accompanying drawings and the embodiments; however, the magnetic circuit portion and the high-voltage direct-current relay according to the present invention, which can improve the initial electromagnetic attraction force, are not limited to the embodiments.

Drawings

Fig. 1 is a structural sectional view of a first embodiment of a magnetic circuit portion of the present invention;

fig. 2 is an exploded perspective view of a first embodiment of a magnetic circuit portion according to the present invention;

FIG. 3 is an enlarged schematic view of section A of FIG. 1;

FIG. 4 is a schematic diagram of the correspondence between magnetic gap and attraction/reaction force;

fig. 5 is a structural sectional view of a second embodiment of a magnetic circuit portion of the present invention;

fig. 6 is an exploded perspective view of a second embodiment of a magnetic circuit portion according to the present invention;

fig. 7 is a structural sectional view of a third embodiment of a magnetic circuit portion of the present invention;

fig. 8 is an exploded perspective view of a third embodiment of a magnetic circuit portion according to the present invention;

fig. 9 is a structural sectional view of a fourth embodiment of a magnetic circuit portion of the present invention;

fig. 10 is an exploded perspective view of a fourth embodiment of a magnetic circuit portion of the present invention;

fig. 11 is a structural sectional view of a fifth embodiment of a magnetic circuit portion of the present invention;

fig. 12 is an exploded perspective view of a fifth embodiment of a magnetic circuit portion of the present invention;

FIG. 13 is an enlarged schematic view of section B of FIG. 11;

fig. 14 is a structural sectional view of a sixth embodiment of a magnetic circuit portion of the present invention;

fig. 15 is an exploded perspective view of a magnetic circuit portion according to a sixth embodiment of the present invention.

Detailed Description

Example one

Referring to fig. 1 to 4, a magnetic circuit portion capable of enhancing an initial electromagnetic attraction force according to the present invention includes a coil 1, a movable magnetizer 2, and a stationary magnetizer 3; the coil 1, the movable magnetizer 2 and the static magnetizer 3 are respectively installed at the matched positions, so that the magnetic pole surface 21 of the movable magnetizer 2 and the magnetic pole surface 31 in the static magnetizer 3 are at opposite positions with preset magnetic gaps, and the movable magnetizer 2 is attracted to the static magnetizer 3 when the coil 1 is electrified; in this embodiment, the movable magnetizer 2 is a movable iron core, the stationary magnetizer 3 is a yoke plate, the magnetic circuit portion further includes a spring 41, a magnetic cylinder 42 and a U-shaped yoke 43, the coil 1 is fitted in a U-shaped opening of the U-shaped yoke 43, the magnetic cylinder 42 is fitted in a central through hole of the coil 1, a bottom end of the magnetic cylinder 42 is connected with the U-shaped yoke 43, the movable iron core 2 is movably fitted in the central through hole of the coil 1 and the central through hole of the magnetic cylinder 42, an upper end surface of the movable iron core 2 is set as a magnetic pole surface 21, the yoke plate 3 is mounted at an upper end of the U-shaped yoke 43 and is located above the coil 1 and the movable iron core 2, the spring 41 is fitted between the movable iron core 2 and the yoke plate 3 to reset the movable iron core 2, a lower end surface of the yoke plate 3 is set as a magnetic pole surface 31, and the movable iron core 2 moves upward and is attracted to the yoke plate 3 when the coil 1 is energized; the magnetic circuit portion further includes a projection member 5, the projection member 5 is slidably fitted at a position corresponding to the magnetic pole surface of one of the two members, i.e., the movable magnetic conductor and the stationary magnetic conductor, in this embodiment, one of the two members is the stationary magnetic conductor, i.e., the yoke plate 3, and the other member is the movable iron core 2, the projection member 5 is slidably fitted at a position corresponding to the magnetic pole surface 31 of the yoke plate 3, and in a state where the movable iron core 2 is not moved upward, the projection member 5 projects from the magnetic pole surface 31 of the yoke plate 3 toward the magnetic pole surface 21 of the movable iron core 2 so that a magnetic gap between the magnetic pole surface 21 of the movable iron core 2 and the magnetic pole surface 31 of the yoke plate 3 becomes small at the position of the projection member 5, thereby making it possible to reduce the magnetic resistance and raise the initial electromagnetic attraction force, and after the movable iron core 2 moves to make the convex part 5 of the yoke iron plate 3 contact with the magnetic pole surface 21 of the movable iron core 2, the convex part 5 moves towards the opposite direction of the protrusion, thereby ensuring that the magnetic pole surface 21 of the movable iron core 2 and the magnetic pole surface 31 of the yoke iron plate 3 are attracted in place.

In the present embodiment, the protruding part 5 is a block structure with a protruding part 51, and the yoke plate 3 is provided with a sliding groove 32 at a position corresponding to the magnetic pole surface 31; the boss member 5 of the block structure is slidably fitted in the slide groove 32 of the yoke iron plate 3, and the protrusion 51 of the boss member 5 protrudes from the magnetic pole surface 31 of the yoke iron plate 3 toward the magnetic pole surface 21 of the movable core 2, and the top surface 511 of the protrusion 51 of the boss member 5 is a flat surface.

In this embodiment, a first step structure is provided between the block structure 5 with the protrusion 51 and the chute 32 of the yoke plate 3, the first step structure includes a step 52 provided in the boss 5 and a step 33 provided in the chute 32 of the yoke plate 3, and the step 52 of the boss 5 and the step 33 of the yoke plate 3 cooperate with each other to limit the protrusion 51 of the boss 5 from moving toward the magnetic pole surface 21 of the movable core 2, so as to ensure a certain gap between the protrusion 51 of the boss 5 and the magnetic pole surface 21 of the movable core 2 when the movable core 2 is not moving. That is, the outer dimension of the magnetic pole face 31 of the boss part 5 protruding out of the yoke plate 3 should be smaller than the preset magnetic gap between the magnetic pole face 21 of the plunger 2 and the magnetic pole face 31 of the yoke plate 3.

In this embodiment, there are two block structures 5 with the protruding portion 51, and there are two corresponding sliding grooves 32 of the yoke plate 3.

The high-voltage direct-current relay comprises the magnetic circuit part capable of improving the initial electromagnetic attraction.

Referring to fig. 4, in the magnetic circuit portion and the high-voltage direct-current relay capable of improving the initial electromagnetic attraction, in the graph, curve 1 is a reaction force curve of relay movement, curve 2 is an attraction force curve of the prior art of the relay, curve 3 is an attraction force curve of the present invention, at the moment of relay startup, a magnetic gap is maximum, as shown in the right side position (i.e., 1.45mm position) of fig. 4, a driving voltage is applied to a coil at this time, and assuming that 7V is given, at this time, an electromagnetic attraction force is generated by the prior art (as shown in the right side of curve 2 of fig. 4); according to the utility model, the magnetic gap is drawn by arranging the convex part 5, the initial magnetic resistance is reduced, the initial attraction force is improved, and the starting power consumption is reduced, at the moment, the driving voltage is still 7V, but a new electromagnetic attraction force is generated and is larger (as shown in the right side of a curve 3 of a figure 4), as can be seen from the figure 4, at the position of 0.35mm of the magnetic gap, a curve 2 is intersected with the curve 3, and at the position of 1.45mm to 0.35mm of the magnetic gap, the electromagnetic attraction force of the utility model is larger than that of the electromagnetic attraction force in the prior art. If the same electromagnetic attraction force as in the prior art is generated, a smaller driving voltage is required, thereby reducing driving power consumption. When the convex part 5 contacts with the magnetic pole surface 21 of the movable iron core 2, the lifting attraction effect of the convex part 5 disappears, because the two magnetic pole surfaces 21 and 31 are close to each other, the electromagnetic attraction force is large at the moment, and the convex part 5 can move reversely, so that the convex part 5 can not block the magnetic pole to continue moving until the iron core is completely closed, namely the magnetic pole surface 21 of the movable iron core 2 and the magnetic pole surface 31 of the yoke plate 3 are attracted together.

The utility model relates to a magnetic circuit part and a high-voltage direct-current relay capable of improving initial electromagnetic attraction, wherein a magnetic circuit part is further provided with a convex part component 5, the convex part component 5 is slidably matched at the position of a yoke plate 3 corresponding to a magnetic pole surface 31, the convex part component 5 protrudes from the magnetic pole surface 31 of the yoke plate 3 to the direction of the magnetic pole surface 21 of a movable iron core 2 when the movable iron core 2 is not moved, and the convex part component 5 moves to the opposite direction after the movable iron core 2 moves to enable the convex part component 5 of the yoke plate 3 to be abutted against the magnetic pole surface 21 of the movable iron core 2. With the structure of the present invention, in the first aspect, the protruding part 5 protrudes from the magnetic pole surface 31 of the yoke iron plate 3 to the magnetic pole surface 21 of the movable iron core 2, so that the magnetic gap between the two magnetic pole surfaces 21 and 31 is reduced at the position of the protruding part 5, thereby reducing the magnetic resistance, improving the initial electromagnetic attraction force, or reducing the coil volume and reducing the coil power consumption under the same initial electromagnetic attraction force; the utility model makes use of the fact that the projection part 5 can move in the opposite direction of the projection, thereby ensuring that the two magnetic pole faces 21, 31 are attracted in place. The utility model also has the characteristic of simple structure. In the second aspect, no abdicating space is required to be arranged in the suction process of the movable iron core 2 and the yoke plate 3, and the abdicating space can be arranged in the gap direction of the movable iron core 2 and the yoke plate 3 to generate the suction force of the movable iron core 2 to the yoke plate 3. In the third aspect, according to the matching of the suction reaction force, when the protruding height of the convex part is required to be designed, the convex part is movable, so that the whole movable magnetizer (movable iron core) or the whole static magnetizer (yoke iron plate) is not required to be replaced in the design stage, and the design cost and the process are reduced.

Example two

Referring to fig. 5 to 6, a magnetic circuit portion and a high voltage dc relay according to the present invention capable of improving an initial electromagnetic attraction force, the difference from the first embodiment is that two static magnetizers are provided, and besides the yoke plate 3, the static iron core 6 is provided, the static iron core 6 and the yoke plate 3 are assembled together, the lower end surface of the static iron core 6 is matched with the magnetic pole surface 21 of the movable iron core 2, namely, the lower end surface of the static iron core 6 is set as the magnetic pole surface 61 matched with the magnetic pole surface 21 of the movable iron core 2, further, the boss member 5 is slidably fitted at a position of the stationary core 6 corresponding to the magnetic pole face 61, the boss member 5 is not mounted at the yoke iron plate 3, the stationary core 6 is provided with the runner 62 and the step 63, the yoke iron plate 3 is not provided with the runner and the step, the boss member 5 is fitted with the runner 62 of the stationary core 6, and the step 52 of the boss member 5 is fitted with the step 63 of the stationary core 6.

EXAMPLE III

Referring to fig. 7 to 8, a magnetic circuit portion and a high-voltage direct-current relay capable of improving an initial electromagnetic attraction force according to the present invention are different from the second embodiment in that a protrusion member 5 is slidably fitted to a position of a movable iron core 2 corresponding to a magnetic pole surface 21, instead of being mounted on a stationary iron core 6, the movable iron core 2 is provided with a chute 22 and a step 23, the stationary iron core 6 is not provided with a chute and a step, the protrusion member 5 is fitted to the chute 22 of the movable iron core 2, and the step 52 of the protrusion member 5 is fitted to the step 23 of the movable iron core 2.

In the embodiment, the movable iron core 2 is arranged at the lower part, the static iron core 6 is arranged at the upper part, and in order to prevent the convex part component 5 from freely falling in the sliding chute 22 of the movable iron core 2, a supporting spring 24 is also arranged at the bottom end of the convex part component 5, and a chock 25 for supporting the supporting spring 24 is also arranged below the supporting spring 24.

Example four

Referring to fig. 9 to 10, a magnetic circuit portion and a high-voltage dc relay according to the present invention capable of improving an initial electromagnetic attraction force are different from those of the first embodiment in that a protrusion member 5 is slidably fitted to a position of a movable iron core 2 corresponding to a magnetic pole surface 21, instead of being mounted to a yoke plate 3, the movable iron core 2 is provided with a chute 22 and a step 23, the yoke plate 3 is not provided with a chute and a step, the protrusion member 5 is fitted to the chute 22 of the movable iron core 2, and the step 52 of the protrusion member 5 is fitted to the step 23 of the movable iron core 2.

In this embodiment, since the movable core 2 is located at the lower part and the yoke plate 3 is located at the upper part, in order to prevent the protrusion part 5 from freely falling in the sliding slot 22 of the movable core 2, a support spring 24 is further installed at the bottom end of the protrusion part 5, and a stopper 25 for supporting the support spring 24 is further provided below the support spring 24.

EXAMPLE five

Referring to fig. 11 to 13, a magnetic circuit portion and a high-voltage direct-current relay capable of improving initial electromagnetic attraction according to the present invention are different from the second embodiment in that a protruding part is not a block structure with a protrusion, a protruding part 7 is a ring member, the ring member 7 is slidably fitted to an outer periphery of the stationary core 6, and one end 71 of the ring member 7 protrudes from the magnetic pole surface 61 of the stationary core 6 in a direction of the magnetic pole surface 21 of the movable core 2, and the stationary core 6 is not provided with a slide groove and a step for fitting the block structure with the protrusion.

In this embodiment, a protruding edge structure that is matched with each other is arranged between the other end of the ring-shaped element 7 and the outer periphery of the stationary iron core 6, the protruding edge structure includes an inner protruding edge 72 that is arranged at the other end of the ring-shaped element 7 and an outer protruding edge 64 that is arranged at a position close to the magnetic pole surface 61 of the stationary iron core 6, and through the matching between the inner protruding edge 72 of the ring-shaped element 7 and the outer protruding edge 64 of the stationary iron core 6, the protruding edge structure limits the movement of one end 71 of the ring-shaped element 7 towards the magnetic pole surface 21 of the movable iron core 2, so that a certain gap is ensured between the one end 71 of the ring-shaped element 7 and the magnetic pole surface 21 of the movable iron core 2 in a state that the movable iron core 2 is not moved.

EXAMPLE six

Referring to fig. 14 to 15, a magnetic circuit portion and a high-voltage direct-current relay capable of improving initial electromagnetic attraction according to the present invention are different from the first embodiment in that a protrusion is not a block structure with a protrusion, the protrusion 7 is a ring member, the ring member 7 is slidably fitted to the outer periphery of the movable core 2, and one end 71 of the ring member 7 protrudes from the magnetic pole surface 21 of the movable core 2 in the direction of the magnetic pole surface 31 of the yoke plate 3, and the yoke plate 3 is not provided with a slide groove and a step for fitting the block structure with a protrusion.

In this embodiment, a protruding edge structure is provided between the other end of the ring 7 and the outer periphery of the movable iron core 6, the protruding edge structure includes an inner protruding edge 72 provided at the other end of the ring 7 and the periphery 27 of the bottom end of the movable iron core 2, and the protruding edge structure restricts the movement of one end 71 of the ring 7 toward the magnetic pole surface 31 of the yoke iron plate 3 by the cooperation of the inner protruding edge 72 of the ring 7 and the periphery 27 of the bottom end of the movable iron core 2, so as to ensure a certain gap between the one end 71 of the ring 7 and the magnetic pole surface 31 of the yoke iron plate 3 in the non-moving state of the movable iron core 2.

In the embodiment, because the movable iron core 2 is arranged at the lower part and the yoke plate 3 is arranged at the upper part, in order to prevent the annular part 7 from freely falling along the outer periphery of the movable iron core 2, a supporting spring 24 is also arranged at the bottom end of the annular part 7, and a metal shell 26 for supporting the supporting spring 24 is also arranged below the supporting spring 24.

The foregoing is considered as illustrative of the preferred embodiments of the utility model and is not to be construed as limiting the utility model in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or equivalent modifications, without departing from the scope of the disclosed embodiments. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.

Claims (10)

1. A magnetic circuit part capable of improving initial electromagnetic attraction force comprises a coil, a movable magnetizer and a static magnetizer; the coil, the movable magnetizer and the static magnetizer are respectively arranged at the matched positions so as to enable the magnetic pole surface of the movable magnetizer and the magnetic pole surface in the static magnetizer to be at opposite positions with preset magnetic gaps, and the movable magnetizer is attracted to the static magnetizer when the coil is electrified; the method is characterized in that: the magnetic circuit portion further includes a projection member slidably fitted at a position corresponding to the magnetic pole surface of one of the movable magnetizer and the stationary magnetizer, and projecting from the magnetic pole surface of the one member toward the magnetic pole surface of the other member in a state where the movable magnetizer is not moved, so that a magnetic gap between the magnetic pole surfaces of the two members becomes smaller at the position of the projection member, thereby enabling to reduce the magnetic resistance, to promote an initial electromagnetic attraction force, and to move in a direction opposite to the projecting direction after the movable magnetizer is moved to make the projection member of the one member abut against the magnetic pole surface of the other member, thereby ensuring that the magnetic pole surfaces of the two members are attracted in place.

2. The magnetic circuit portion capable of lifting an initial electromagnetic attraction force according to claim 1, characterized in that: the convex part is of a block structure with a convex part, and a sliding groove is arranged at the position, corresponding to the magnetic pole surface, of one of the movable magnetizer and the static magnetizer; the convex part of the block structure is slidably matched in the sliding groove of one of the movable magnetizer and the static magnetizer, and the convex part of the convex part protrudes from the magnetic pole surface of the one part to the magnetic pole surface of the other part.

3. The magnetic circuit portion capable of lifting an initial electromagnetic attraction force according to claim 2, characterized in that: the block structure with the protruding portion and the sliding groove are provided with first step structures which are matched with each other, the protruding portion of the protruding portion component is limited to move towards the direction of the magnetic pole face of the other component by the first step structures, and therefore a certain gap is formed between the protruding portion of the protruding portion component of one component and the magnetic pole face of the other component when the movable magnetizer is not moved.

4. The magnetic circuit portion capable of lifting an initial electromagnetic attraction force according to claim 2 or 3, characterized in that: the block structure with the protruding part is one or more than two, and the sliding groove of one of the two parts of the movable magnetizer and the static magnetizer is one or more than two corresponding to the sliding groove.

5. The magnetic circuit portion capable of lifting an initial electromagnetic attraction force according to claim 1, characterized in that: the protruding part is an annular part which is slidably matched with the outer periphery of one of the movable magnetizer and the static magnetizer, and one end of the annular part protrudes from the magnetic pole surface of the one part to the magnetic pole surface of the other part.

6. The magnetic circuit portion capable of lifting an initial electromagnetic attraction force according to claim 5, characterized in that: and a convex edge structure which is matched with each other is arranged between the other end of the annular piece and the outer periphery of one of the movable magnetizer and the static magnetizer, and the convex edge structure limits one end of the annular piece to move towards the magnetic pole surface of the other part so as to ensure that a certain gap is formed between one end of the annular piece and the magnetic pole surface of the other part when the movable magnetizer is not moved.

7. The magnetic circuit portion capable of lifting an initial electromagnetic attraction force according to claim 1, 2, 3, 5, or 6, characterized in that: one of the two parts of the movable magnetizer and the static magnetizer is the movable magnetizer, the convex part can be matched on the movable magnetizer in a sliding way, and the movable magnetizer is a movable iron core.

8. The magnetic circuit portion capable of lifting an initial electromagnetic attraction force according to claim 1, 2 or 3, characterized in that: one of the two parts of the movable magnetizer and the static magnetizer is the static magnetizer, the convex part can be matched on the static magnetizer in a sliding way, and the static magnetizer is a yoke iron plate.

9. The magnetic circuit portion capable of lifting an initial electromagnetic attraction force according to claim 1, 2, 3, 5, or 6, characterized in that: one of the two parts of the movable magnetizer and the static magnetizer is the static magnetizer, the convex part can be matched on the static magnetizer in a sliding way, and the static magnetizer is a static iron core.

10. A high-voltage direct-current relay is characterized in that: comprising a magnetic circuit portion capable of lifting an initial electromagnetic attraction force as claimed in any one of claims 1 to 9.

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