Magnetic latching type tripping execution unit and switching electric appliance

Abstract

The invention relates to a magnetic latching type tripping execution unit and a switching device, the magnetic latching type tripping execution unit is used for triggering a tripping mechanism in the switching device and comprises a magnet yoke, an armature, a coil and magnetic steel, and the magnet yoke comprises a U-shaped yoke with an opening facing the armature; the magnetic steel is magnetically coupled to the magnetic yoke and transmits magnetic flux of the magnetic steel through a magnetic steel working magnetic loop formed by the magnetic yoke and the armature, the coil is wound on the magnetic yoke and transmits coil magnetic flux for reducing the magnetic flux of the magnetic steel through a tripping driving magnetic loop formed by the magnetic yoke and the armature, and two short-circuit magnetic loops for short-circuit connection of the magnetic steel are arranged on the outer side of the magnetic steel. When a magnetic gap is generated between the armature and the U-shaped yoke, more magnetic flux can be separated by a short-circuit magnetic loop, so that the magnetic flux at the pole face of the U-shaped yoke drops more quickly, the attraction force of magnetic steel on the armature is reduced more quickly, the armature can be disengaged only by a smaller current of the coil, and the coil is more convenient to use. Therefore, the magnetic flux in the magnetic steel working loop is more sensitive to the pole face gap, and the sensitivity of the tripping execution unit is improved.

Description

Technical Field

[0001] The present invention relates to the manufacturing technology of switching electrical appliances, and particularly to a magnetic latching tripping execution unit. Background Art

[0002] With the popularization of electrical equipment, people's opportunities to contact relevant equipment have gradually increased, and electrical safety has received more and more attention. In order to effectively prevent the harm of residual current to people and equipment, residual current devices (RCDs) are widely used in important occasions. The RCD has the characteristics of residual current protection action and is independent of the power supply voltage. Among the residual current devices, there is a type of electromagnetic RCD. Generally, when the residual current does not exceed 100 mA, the electromagnetic RCD can be tripped to disconnect the circuit, and it does not require an auxiliary power supply. The electromagnetic RCD uses a current transformer to convert the residual current to the secondary side, and the output of the secondary side is used to drive the tripping execution unit, which then pushes the RCD to trip and disconnect the circuit. In the case of no auxiliary power supply, since the input residual current of the current transformer is very small, the secondary side current is extremely small, and the driving power given to the tripping execution unit is very low. Therefore, the tripping execution unit is required to be very sensitive.

[0003] Currently, a structure of a magnetic latching tripping execution unit is as shown in Figure 1 、 2 , and it includes a first yoke 1, a second yoke 2, an armature 3, a permanent magnet 4, a coil 5, a tension spring 6, and a push rod 7. The first yoke 1 is of an L-shaped structure, and the second yoke 2 is of a Z-shaped structure. The first yoke 1 and the second yoke 2 are combined to form a U-shaped yoke 10 with an opening facing the armature 3, and the permanent magnet 4 is sandwiched between the first yoke 1 and the second yoke 2. The U-shaped yoke 10 includes a first pole face 101 on the first yoke 1 and a second pole face 102 on the second yoke 2. Under the influence of the permanent magnet 4, a working air-gap magnetic field is formed between the first pole face 101 and the second pole face 102. The armature 3 is a swingable lever mechanism, and one end of the tension spring 6 acts on the armature 3. As shown in Figure 1 , in the closed state, the armature 3 is magnetically adsorbed to the U-shaped yoke 10. At this time, the magnetic flux of the permanent magnet 4 passes through the working magnetic circuit φ1 of the permanent magnet, and the armature 3 is held on the first pole face 101 and the second pole face 102 of the U-shaped yoke 10. And the tension spring 6 is stretched and stores energy by the armature 3. The coil 5 is wound around the first yoke 1. When the coil 5 is energized, the magnetic flux generated by the coil 5 passes through the tripping drive magnetic circuit φ2 to reduce the magnetic flux of the permanent magnet 4 of the permanent magnet 4. Thus, the adsorption force of the U-shaped yoke 10 on the armature 3 is weakened. Under the elastic force of the tension spring 6, the armature 3 disengages (as shown in Figure 2 ). The push rod 7 is slidably arranged on the swing path after the armature 3 disengages. Once the armature 3 disengages, it can push the push rod 7 to eject the tripping execution unit to trigger the tripping action of the tripping mechanism.

[0004] In addition, one end 21 of the second yoke 2 is arranged to be parallel and close to the winding section 11 around which the coil 5 is wound on the first yoke 1, so that a short-circuit magnetic circuit φ3 of the permanent magnet 4 is formed on the side where the permanent magnet 4 is close to the winding section 11. Through the short-circuit magnetic circuit φ3, when a magnetic gap is generated between the armature 3 and the U-shaped yoke 10, more magnetic fluxes will pass through the short-circuit magnetic circuit φ3 (that is, the short-circuit magnetic circuit φ3 diverts part of the permanent magnet magnetic fluxes), so that the magnetic fluxes at the first pole face 101 and the second pole face 102 decrease faster. Therefore, the coil 5 only needs a smaller current to realize the disengagement of the armature 3.

[0005] However, when this existing magnetic latching release actuator is applied to some occasions that require extremely high sensitivity, its sensitivity is still insufficient. At present, the conventional means to improve the sensitivity of the release actuator is to increase the spring force of the tension spring 6 (such as replacing the tension spring with a larger spring constant), so that the pulling force of the tension spring 6 on the armature 3 is greater when the armature 3 is in the closed state, so that the tension spring 6 can pull the armature 3 faster when the armature 3 disengages. However, correspondingly, if the spring force of the tension spring 6 is increased, the magnetic holding force of the U-shaped yoke 10 on the armature 3 also needs to be increased accordingly to hold the armature 3 in the closed position. In this way, the total magnetic flux of the permanent magnet 4 has to be increased, and the magnetic flux in the working magnetic circuit φ1 of the permanent magnet also increases. Then, to make the release actuator operate, a greater power needs to be provided to the coil 5. Obviously, in the small-current occasions that require extremely high sensitivity, this scheme of increasing the spring force is self-contradictory and not applicable. Summary of the Invention

[0006] Therefore, in view of the above problems, the present invention proposes a more optimized magnetic latching release actuator, which can still maintain extremely high sensitivity in the application occasions with small input current, or make the driving current required by the coil smaller under the same magnetic holding force. Based on this magnetic latching release actuator, the present invention also proposes a switching electrical appliance with a magnetic latching release actuator.

[0007] The present invention is implemented by adopting the following technical solutions:

[0008] The present invention proposes a magnetic latching release actuator for triggering a tripping mechanism in a switching electrical appliance, including a magnetic yoke, an armature, a coil, and a permanent magnet. The magnetic yoke includes a U-shaped yoke with an opening facing the armature. The permanent magnet is magnetically coupled to the magnetic yoke and transmits the magnetic flux of the permanent magnet through the working magnetic circuit of the permanent magnet formed by the magnetic yoke and the armature. The coil is wound on the magnetic yoke and transmits the coil magnetic flux that reduces the magnetic flux of the permanent magnet through the tripping drive magnetic circuit formed by the magnetic yoke and the armature. Two short-circuit magnetic circuits for short-circuiting the permanent magnet are arranged outside the permanent magnet.

[0009] In one embodiment, preferably, the path of one of the short-circuit magnetic circuits does not overlap with the path of the tripping drive magnetic circuit.

[0010] In one embodiment, preferably, the yoke includes a first yoke iron and a second yoke iron. The first yoke iron and the second yoke iron are combined to form the U-shaped yoke. The first yoke iron and the second yoke iron sandwich the magnet steel. The first yoke iron and the second yoke iron enclose to form a frame structure that basically completely surrounds the magnet steel, so as to form two short-circuit magnetic circuits that short-circuit the magnet steel on the frame structure.

[0011] In one embodiment, preferably, the U-shaped yoke includes a first yoke arm and a second yoke arm that respectively form a first pole face and a second pole face. The first yoke arm is arranged on the first yoke iron as a winding segment around which the coil is wound. The second yoke arm is arranged on the second yoke iron. It is defined that the armature is located on the upper side of the yoke. The first yoke arm and the second yoke arm extend vertically upward and downward at intervals.

[0012] In one embodiment, preferably, the frame structure and the first yoke arm are spaced apart, so that there is a winding space for winding the coil in the circumferential direction of the entire first yoke arm.

[0013] In one embodiment, preferably, the first yoke iron is an "L" - shaped structure, including the first yoke arm and a first horizontal straight arm connected to the lower end of the first yoke arm. The second yoke iron is an "h" - shaped structure, including the second yoke arm, a second horizontal straight arm connected to the lower end of the second yoke arm, and a first vertical arm and a second vertical arm that are spaced apart and connected to the lower end of the second horizontal straight arm and extend downward. The first horizontal straight arm, the second horizontal straight arm, the first vertical arm and the first yoke arm enclose to form a frame structure that basically completely surrounds the magnet steel; or, the first yoke iron is a "U" - shaped structure, including the first yoke arm, a first horizontal straight arm connected to the lower end of the first yoke arm, and a third vertical arm connected to the end of the first horizontal straight arm far from the first yoke arm and extending upward. The second yoke iron is a "Z" - shaped structure, including the second yoke arm, a second horizontal straight arm connected to the lower end of the second yoke arm, and a fourth vertical arm connected to the end of the second horizontal straight arm far from the second yoke arm and extending downward. The first horizontal straight arm, the second horizontal straight arm, the third vertical arm and the fourth vertical arm enclose to form a frame structure that basically completely surrounds the magnet steel.

[0014] In one embodiment, preferably, the directions in which the two magnetic poles of the magnet steel face each other are along the vertical up - and - down direction, or along the horizontal direction perpendicular to the vertical up - and - down direction.

[0015] In one embodiment, preferably, the U-shaped yoke includes a first yoke arm and a second yoke arm respectively forming a first pole face and a second pole face, the first yoke arm is arranged on the first yoke as a winding segment wound with the coil, the second yoke arm is arranged on the second yoke, the first yoke arm and the second yoke arm are spaced apart and extend in the same direction, the tripping drive magnetic circuit is arranged within the interval span range of the first yoke arm and the second yoke arm, and the magnetic steel is arranged outside the interval span range of the first yoke arm and the second yoke arm, so that the path of one of the short-circuit magnetic circuits does not overlap with the path of the tripping drive magnetic circuit.

[0016] In one embodiment, preferably, the armature is defined as being located on the upper side of the yoke, the first yoke arm and the second yoke arm extend vertically up and down at intervals, the first yoke includes the first yoke arm, a first horizontal arm connected to the lower end of the first yoke arm, and a fifth vertical arm connected to the first horizontal arm and extending upward, the fifth vertical arm is close to the second yoke arm, the second yoke includes the second yoke arm, a second horizontal arm connected to the lower end of the second yoke arm, and a sixth vertical arm connected to the second horizontal arm away from one end of the second yoke arm and extending downward, the magnetic steel is arranged on a side of the fifth vertical arm away from the first yoke arm, the first yoke arm, the second yoke arm, the first horizontal arm, the fifth vertical arm and the armature constitute the tripping drive magnetic circuit, the first horizontal arm, the second horizontal arm, the fifth vertical arm and the sixth vertical arm are enclosed to form a frame structure that basically completely surrounds the magnetic steel.

[0017] In one embodiment, preferably, the armature is defined as being located on the upper side of the yoke, the first yoke arm and the second yoke arm extend vertically up and down at intervals, the first yoke is a "U"-shaped structure, including the first yoke arm, a first horizontal arm connected to the lower end of the first yoke arm, and a seventh vertical arm connected to the first horizontal arm away from one end of the first yoke arm and extending upward, the second yoke includes a second yoke arm and a second horizontal arm, wherein the second yoke arm extends downward to be close to the first horizontal arm, the second horizontal arm and the second yoke arm are crossed in a "T" shape, the magnetic steel is arranged on the side of the second yoke arm away from the first yoke arm, the first yoke arm, the second yoke arm, the first horizontal arm and the armature constitute the tripping drive magnetic circuit, the first horizontal arm, the second horizontal arm, the second yoke arm and the seventh vertical arm are enclosed to form a frame structure that basically completely surrounds the magnetic steel.

[0018] In one embodiment, preferably, one end of the second horizontal arm away from the second yoke arm is further connected to an eighth vertical arm extending upward, and the eighth vertical arm is close to the seventh vertical arm.

[0019] In one embodiment, preferably, the yoke is a single U-shaped yoke iron, the U-shaped opening of which faces the armature, the magnetic steel is in a strip structure, the magnetic steel is fixedly arranged outside the U-shaped surrounding area of the yoke, and a non-magnetic extreme end of the magnetic steel is closely arranged on the yoke, so as to form a short-circuit magnetic circuit that short-circuits the magnetic steel on the yoke. A magnetic conductor is further included, and the magnetic conductor is fixedly arranged outside the magnetic steel, so as to form another short-circuit magnetic circuit that short-circuits the magnetic steel.

[0020] In one embodiment, preferably, the magnetic conductor is fixedly arranged on the side of the magnetic steel away from the yoke.

[0021] In one embodiment, preferably, a magnetic isolation sheet is arranged between the magnetic conductor and the magnetic steel.

[0022] In one embodiment, preferably, the magnetic conductor is in a planar sheet structure or a U-shaped sheet structure that semi-surrounds the magnetic steel.

[0023] In one embodiment, preferably, one end of the yoke away from its opening includes two adjacent right-angle connecting parts, and the magnetic steel is closely arranged on one side where the two right-angle connecting parts are connected.

[0024] In one embodiment, preferably, one end of the yoke away from its opening includes an adjacent right-angle connecting part and an oblique-angle connecting part, and the magnetic steel is closely arranged on the oblique-angle connecting part.

[0025] Based on the above magnetic holding type tripping execution unit, the present invention further provides a switching electrical appliance, including a tripping mechanism and the above magnetic holding type tripping execution unit for triggering the tripping mechanism.

[0026] The present invention has the following beneficial effects:

[0027] 1. The magnetic holding type tripping execution unit of the present invention is provided with two short-circuit magnetic circuits that short-circuit the magnetic steel outside the magnetic steel. The magnetic flux generated by the magnetic steel is divided into three parts. When a magnetic gap is generated between the armature and the U-shaped yoke, more magnetic flux will be diverted by the short-circuit magnetic circuit, so that the magnetic flux at the pole face of the U-shaped yoke drops faster, and the suction force of the magnetic steel on the armature decreases faster. Therefore, the coil only needs a smaller current (or a lower coil power) to disengage the armature, making the magnetic flux in the working circuit of the magnetic steel more sensitive to the pole face gap, thereby improving the sensitivity of the tripping execution unit. On the other hand, if the present invention wants to increase the pulling force of the tension spring to improve the sensitivity of the tripping execution unit, the energy required to increase the magnetic flux of the magnetic steel to increase the magnetic holding force is also less than that of the prior art.

[0028] 2. The magnetic holding type tripping execution unit of the present invention can surround the magnetic steel with a magnetic conductor, and preferably shields the influence of the external magnetic field on the magnetic steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of a magnetic holding type tripping actuator in the prior art (first, the armature is in a closed state);

[0030] Figure 2 It is a schematic diagram of a magnetic holding type tripping execution unit in the prior art (secondly, the armature is in a disengaged state);

[0031] Figure 3 is a schematic diagram of the switch electrical appliance in Example 1;

[0032] Figure 4 is a schematic diagram of the magnetic holding type tripping actuator in Example 1 (first, the armature is in a closed state);

[0033] Figure 5 is a schematic diagram of the magnetic holding type tripping execution unit in Example 1 (second, the armature is in the disengaged state);

[0034] Figure 6 is a curve diagram of the magnetic steel attraction force at the pole surface of the magnetic steel in the magnetic holding tripping execution unit in Example 1 compared with the magnetic holding tripping execution unit in the prior art;

[0035] Figure 7 is a schematic diagram of a magnetically latched tripping execution unit in Example 2;

[0036] Figure 8 is a schematic diagram of a magnetically latched tripping execution unit in Example 3;

[0037] Figure 9 is a schematic diagram of a magnetically latched tripping execution unit in Embodiment 4;

[0038] Figure 10 is a schematic diagram of a magnetically latched tripping execution unit in Embodiment 5;

[0039] Figure 11 is a schematic diagram of a variation of Embodiment 5;

[0040] Figure 12 is a schematic diagram of a magnetically latched tripping execution unit in Example 6;

[0041] Figure 13 is a schematic diagram of a variation of Embodiment 6;

[0042] Figure 14 It is a schematic diagram of the magnetic holding type tripping execution unit in Example 7. DETAILED DESCRIPTION

[0043] To further illustrate the embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation manners and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0044] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation manners.

[0045] Embodiment 1:

[0046] Referring to Figure 3 shown, as a preferred embodiment of the present invention, a switching electrical appliance is provided, more specifically a circuit breaker, including a tripping mechanism 200 and a tripping execution unit 100 for triggering the tripping mechanism 200. The tripping execution unit 100 is a magnetic latching tripping execution unit, and its structure is as Figure 4 、 5 shown, including a magnetic yoke, an armature 3, a permanent magnet 4, a coil 5, a tension spring 6 and a push rod 7. The magnetic yoke is a double yoke iron structure, including a first yoke iron 1 and a second yoke iron 2. The first yoke iron 1 and the second yoke iron 2 are combined to form a U-shaped yoke 10 with an opening facing the armature 3. The permanent magnet 4 is sandwiched between the first yoke iron 1 and the second yoke iron 2. The U-shaped yoke 10 includes a first magnetic yoke arm 11 and a second magnetic yoke arm 21 that respectively form a first pole face 101 and a second pole face 102. The first magnetic yoke arm 11 is provided on the first yoke iron 1 as a winding segment around which the coil 5 is wound, and the second magnetic yoke arm 21 is provided on the second yoke iron 2. For ease of description, it is defined that the armature 3 is located above the magnetic yoke, then the first magnetic yoke arm 11 and the second magnetic yoke arm 21 are spaced apart and extend vertically up and down.

[0047] Under the influence of the permanent magnet 4, a working air-gap magnetic field is formed between the first pole face 101 and the second pole face 102. The armature 3 is a swingable lever mechanism, and one end of the tension spring 6 acts on the armature 3. As Figure 4 shown, in the closed state, the armature 3 is magnetically adsorbed on the U-shaped yoke 10. At this time, the magnetic flux of the permanent magnet 4 passes through the working magnetic circuit φ1 of the permanent magnet, and the armature 3 is held on the first pole face 101 and the second pole face 102 of the U-shaped yoke 10. And the tension spring 6 is stretched and stored energy by the armature 3. When the coil 5 is energized, the magnetic flux generated by the coil 5 passes through the tripping drive magnetic circuit φ2 to reduce the magnetic flux of the permanent magnet 4 of the permanent magnet 4. Thus, the adsorption force of the U-shaped yoke 10 on the armature 3 is weakened. Under the elastic force of the tension spring 6, the armature 3 disengages (as Figure 5 shown). The push rod 7 is slidably provided on the swing path after the armature 3 disengages. Once the armature 3 disengages, it can push the push rod 7 to eject the tripping execution unit to trigger the tripping action of the tripping mechanism.

[0048] It should be noted that the "U-shaped yoke 10" refers to a structure formed by the combination of the first yoke iron 1 and the second yoke iron 2, which is generally a magnetic yoke with a U-shaped opening. The opening end of the U-shaped yoke 10 is a U-shaped opening structure, but the structure of the closed end of the U-shaped yoke 10 far from its opening end can vary according to actual applications and does not necessarily form a standard U-shaped shape.

[0049] For example Figure 5 , specifically, in this embodiment, the first yoke iron 1 and the second yoke iron 2 enclose each other to form a frame structure S that substantially completely surrounds the magnet 4, thereby forming two short-circuit magnetic circuits φ3 and φ4 that short-circuit the magnet 4 on the frame structure S. Specifically, in this embodiment, the first yoke iron 1 has an "L" shape and includes a first magnetic yoke arm 11 and a first horizontal straight arm 12 connected to the lower end of the first magnetic yoke arm 11. The second yoke iron 2 has an "h" shape and includes a second magnetic yoke arm 21, a second horizontal straight arm 22 connected to the lower end of the second magnetic yoke arm 21, and a first vertical arm 23 and a second vertical arm 24 that are spaced apart and connected to the lower end of the second horizontal straight arm 22 and extend downward. The first horizontal straight arm 12, the second horizontal straight arm 22, the first vertical arm 23, and the first magnetic yoke arm 11 enclose the frame structure S, and the second vertical arm 24 can increase the magnetic transmission area and efficiency between the frame structure S and the first yoke iron 1.

[0050] The frame structure S of this embodiment is composed of several straight arm structures to form a roughly rectangular shape. In other embodiments, the frame structure can also be composed of curved arms or irregularly shaped arms, that is, as long as it can form a frame structure that surrounds the magnet 4, it is feasible. Since magnetic transmission can be achieved even when there is a small gap between the first yoke iron 1 and the second yoke iron 2, there can be a gap between the first yoke iron 1 and the second yoke iron 2. In other words, the frame structure S only needs to substantially completely surround the magnet 4, rather than completely and tightly surround the magnet 4.

[0051] The frame structure S of this embodiment can surround the magnet 4 and preferably shield the influence of the external magnetic field on the magnet 4. More importantly, in this embodiment, by providing two short-circuit magnetic circuits φ3 and φ4 that short-circuit the magnet 4 outside the magnet 4, the magnetic flux generated by the magnet 4 is divided into three parts. When a magnetic gap is generated between the armature 3 and the U-shaped yoke 10, more magnetic flux will pass through the short-circuit magnetic circuits φ3 and φ4, so that the magnetic flux at the first pole face 101 and the second pole face 102 decreases faster, making the suction force of the magnet 4 on the armature 3 decrease faster. Therefore, the coil 5 only needs a smaller current (or a lower coil power) to achieve the disengagement of the armature 3, making the magnetic flux in the working circuit of the magnet more sensitive to the pole face gap, thereby improving the sensitivity of the tripping execution unit.

[0052] Figure 6The figure shows a graph of the magnetic pole face attraction force of the permanent magnet at the pole face of the magnetic latching release actuator unit of this embodiment compared with that of the prior art. It can be seen that this embodiment is provided with two short-circuit magnetic circuits. Since more magnetic flux of the permanent magnet is diverted by the short-circuit magnetic circuits, the magnetic flux at the first pole face 101 and the second pole face 102 decreases faster, causing the suction force of the permanent magnet 4 on the armature 3 to decrease faster. On the other hand, if this embodiment wants to increase the spring force of the tension spring 6 to improve the sensitivity of the release actuator unit, the energy required to correspondingly increase the magnetic flux of the permanent magnet to increase the magnetic latching force is also less than that of the prior art.

[0053] In this embodiment, there are opposite permanent magnet short-circuit surfaces between the parts of the first yoke 1 and the second yoke 2 that form the frame structure S. Preferably, the gap between the two permanent magnet short-circuit surfaces is not greater than 0.2 mm. Further, a magnetic isolation sheet can be provided between the parts of the first yoke 1 and the second yoke 2 that are close to each other, such as the magnetic isolation sheet 8 provided between the second vertical arm 24 and the first magnetic yoke arm 11. Preferably, the magnetic isolation sheet 8 makes the gap between the permanent magnet short-circuit surfaces between the first yoke 1 and the second yoke 2 not greater than 0.2 mm. By controlling the thickness of the magnetic isolation sheet, the matching effect of the short-circuit magnetic circuits φ3, φ4 and the permanent magnet working magnetic circuit φ1 can be better.

[0054] The magnetic latching release actuator unit of this embodiment has extremely high sensitivity and can be applied to small current occasions that require extremely high sensitivity.

[0055] Embodiment 2:

[0056] As Figure 7 , this embodiment provides a magnetic latching release actuator unit, whose structure is basically similar to that of the magnetic latching release actuator unit in Embodiment 1 and has the same technical effects with the same structure. The difference between this embodiment and the magnetic latching release actuator unit in Embodiment 1 lies in the different structures of the first yoke and the second yoke. In this embodiment, the first yoke 1A is a "U" - shaped structure, including a first magnetic yoke arm 11A, a first horizontal straight arm 12A connected to the lower end of the first magnetic yoke arm 11A, and a third vertical arm 13A connected to the end of the first horizontal straight arm 12A away from the first magnetic yoke arm 11A and extending upward. The second yoke 2A is a "Z" - shaped structure, including a second magnetic yoke arm 21A, a second horizontal straight arm 22A connected to the lower end of the second magnetic yoke arm 21A, and a fourth vertical arm 23A connected to the end of the second horizontal straight arm 22A away from the second magnetic yoke arm 21A and extending downward. The first horizontal straight arm 12A, the second horizontal straight arm 22A, the third vertical arm 13A and the fourth vertical arm 23A enclose to form a frame structure that basically completely surrounds the permanent magnet 4A, thus forming two short - circuit magnetic circuits φ3A, φ4A for short - circuiting the permanent magnet 4A. The figure also marks the permanent magnet working magnetic circuit φ1A and the release drive magnetic circuit φ2A for understanding.

[0057] In addition, in this embodiment, the frame structure formed by the first horizontal and vertical arm 12A, the second horizontal and vertical arm 22A, the third vertical arm 13A, and the fourth vertical arm 23A is spaced apart from the first yoke arm 11A, so that there is a winding space for winding the coil 5A in the circumferential direction of the entire first yoke arm 11A. By using this winding space, the axial length of the coil 5A in this embodiment is substantially equal to the length of the first yoke arm 11A, thereby increasing the number of turns of the coil 5A, reducing the inductance of the coil 5A, and improving the coil efficiency of the coil 5A.

[0058] Embodiment 3:

[0059] As Figure 8 , this embodiment provides a magnetic holding type tripping actuator unit, whose structure is basically similar to that of Embodiment 2. The only difference is the orientation of the magnetic poles of the permanent magnet. In Embodiment 2, the direction in which the two magnetic poles of the permanent magnet 4A face each other is along the vertical up and down direction. In this embodiment, the direction in which the two magnetic poles of the permanent magnet 4B face each other is along the horizontal direction perpendicular to the vertical up and down direction. The working magnetic circuit φ1B, the tripping drive magnetic circuit φ2B, and the two short-circuit magnetic circuits φ3B, φ4B are also marked in the figure for understanding. Of course, in other embodiments, the orientation of the permanent magnet does not necessarily have to be along the vertical or horizontal direction, and even an orientation with some inclination angles is feasible.

[0060] Embodiment 4:

[0061] As Figure 9, this embodiment provides a magnetic holding type tripping execution unit, and its structure is basically similar to the magnetic holding tripping execution unit in Example 1, and has the same technical effect as the same structure. The difference between this embodiment and the magnetic holding tripping execution unit in Example 1 is that the structures of the first yoke and the second yoke are different. In this embodiment, the first yoke 1C includes a first magnetic yoke arm 11C, a first horizontal arm 12C connected to the lower end of the first magnetic yoke arm 11C, and a fifth vertical arm 13C connected to the first horizontal arm 12C and extending upward, the fifth vertical arm 13C is close to the second magnetic yoke arm 21C, the second yoke 2C includes a second magnetic yoke arm 21C, a second horizontal arm 22C connected to the lower end of the second magnetic yoke arm 21C, and a sixth vertical arm 23C connected to the second horizontal arm 22C away from one end of the second magnetic yoke arm 21C and extending downward, and the magnetic steel 4C is arranged The fifth vertical arm 13C is away from the side of the first yoke arm 11C, and the first yoke arm 11C is still used as the winding section of the winding coil 5C. The first yoke arm 11C, the second yoke arm 21C, the first horizontal arm 12C, the fifth vertical arm 13C and the armature 3C form a release drive magnetic circuit φ2C. The first horizontal arm 12C, the second horizontal arm 22C, the fifth vertical arm 13C and the sixth vertical arm 23C are enclosed to form a frame structure that basically fully surrounds the magnetic steel 4C, thereby forming two short-circuited magnetic circuits φ3C and φ4C of the short-circuited magnetic steel 4C. The magnetic steel working magnetic circuit φ1C is also marked in the figure for understanding.

[0062] Most importantly, the tripping driving magnetic circuit φ2C is arranged within the interval span range of the first yoke arm 11C and the second yoke arm 21C, while the magnetic steel 4C is arranged outside the interval span range of the first yoke arm 11C and the second yoke arm 21C, so that the path of the short-circuit magnetic circuit φ3C and the path of the tripping driving magnetic circuit φ2C do not overlap at any part. With such an arrangement, when the coil 5C is energized, the short-circuit magnetic circuit φ3C can more effectively short-circuit the magnetic flux generated by the magnetic steel 4C, and at the same time, the magnetic flux generated by the coil 5C becomes more efficient due to the reduction of the obstruction caused by the magnetic steel magnetic flux, so the coil power required for the tripping execution unit to operate becomes smaller, thereby improving the sensitivity of the tripping execution unit.

[0063] Embodiment 5:

[0064] like Figure 10, This embodiment provides a magnetically held tripping execution unit, and its structure is basically similar to that of the magnetically held tripping execution unit in Embodiment 1, and has the same technical effect as that of the magnetically held tripping execution unit in Embodiment 1. The difference between this embodiment and the magnetically held tripping execution unit in Embodiment 1 is that the structures of the first yoke and the second yoke are different. In this embodiment, the first yoke 1D is a "U"-shaped structure, including a first magnetic yoke arm 11D, a first horizontal arm 12D connected to the lower end of the first magnetic yoke arm 11D, and a seventh vertical arm 13D connected to the first horizontal arm 12D away from one end of the first magnetic yoke arm 11D and extending upward, the second yoke 2D includes a second magnetic yoke arm 21D and a second horizontal arm 22D, wherein the second magnetic yoke arm 21D extends downward to be close to the first horizontal arm 12D, and the second horizontal arm 22D and the second magnetic yoke arm 21D are crossed in a "T" shape, and the magnetic steel 4D The second yoke arm 21D is arranged on the side away from the first yoke arm 11D. The first yoke arm 11D is still used as the winding section of the winding coil 5D. The first yoke arm 11D, the second yoke arm 21D, the first horizontal arm 12D and the armature 3D form a release drive magnetic circuit φ2D. The first horizontal arm 12D, the second horizontal arm 22D, the second yoke arm 21D and the seventh vertical arm 13D are enclosed to form a frame structure that basically fully surrounds the magnetic steel 4D, thereby forming two short-circuited magnetic circuits φ3D and φ4D that short-circuit the magnetic steel 4D. The magnetic steel working magnetic circuit φ1D is also marked in the figure for understanding.

[0065] Most importantly, the tripping driving magnetic circuit φ2D is arranged within the interval span range of the first yoke arm 11D and the second yoke arm 21D, while the magnetic steel 4D is arranged outside the interval span range of the first yoke arm 11D and the second yoke arm 21D, so that the path of the short-circuit magnetic circuit φ3D does not overlap with the path of the tripping driving magnetic circuit φ2D. With such an arrangement, when the coil 5D is energized, the short-circuit magnetic circuit φ3D can more effectively short-circuit the magnetic flux generated by the magnetic steel 4D, and at the same time, the magnetic flux generated by the coil 5D becomes more efficient due to the reduction of the obstruction caused by the magnetic steel magnetic flux, so the coil power required when the tripping execution unit is actuated becomes smaller, thereby improving the sensitivity of the tripping execution unit.

[0066] Figure 11 A variation of this embodiment is shown, in which an end of the second horizontal arm 22D away from the second yoke arm 21D is also connected to an eighth vertical arm 23D extending upward, and the eighth vertical arm 23D and the seventh vertical arm 13D are close to each other to improve the magnetic conductivity. A magnetic isolation sheet is also provided between the eighth vertical arm 23D and the seventh vertical arm 13D, and the thickness of the magnetic isolation sheet can be controlled to make the matching effect of the short-circuit magnetic circuit φ3D, φ4D and the magnetic steel working magnetic circuit φ1D better.

[0067] Embodiment 6:

[0068] This embodiment provides a magnetic latching trip execution unit, which has the same structures as the magnetic latching trip execution unit in Embodiment 1, such as armature 63, tension spring, push rod, etc. In this embodiment, the yoke 60 is a single U-shaped yoke iron, and its U-shaped opening faces the armature 63. The magnet 64 is in a strip structure, and the magnet 64 is fixedly arranged outside the U-shaped surrounding area of the yoke 60. One non-magnetic end of the magnet 64 is closely arranged on the yoke 60, so as to form a short-circuit magnetic circuit φ3E that short-circuits the magnet 64 on the yoke 60. In the closed state, the armature 63 is magnetically adsorbed on the yoke 60. At this time, the magnetic flux of the magnet 64 passes through the working magnetic circuit φ1E of the magnet, and the armature 63 is held at the opening end of the yoke 60. And the tension spring is stretched and stored energy by the armature 63. The coil 61 is wound around the yoke 60. When the coil 61 is energized, the magnetic flux generated by the coil 61 passes through the trip drive magnetic circuit φ2E to reduce the magnetic flux of the magnet 64 of the magnet, so that the adsorption force of the yoke 60 on the armature 63 is weakened. Under the action of the elastic force of the tension spring, the armature 63 disengages.

[0069] This embodiment also provides a magnetic conductor 65, and the magnetic conductor 65 is fixedly arranged outside the magnet 64, so as to form another short-circuit magnetic circuit φ4E that short-circuits the magnet 64.

[0070] This embodiment adopts a single yoke iron structure, and its manufacturing is simpler. By adding the magnetic conductor 65, the design of the double short-circuit loop of the magnet 64 is formed, thereby improving the sensitivity of the trip execution unit. On the other hand, the magnetic conductor 65 and the yoke 60 sandwich the magnet 64 between the two, and can better shield the influence of the external magnetic field on the magnet 64.

[0071] There can be a gap between the magnetic conductor 65 and the yoke 60, and the gap between the opposite magnetic path short-circuit surfaces of the two is preferably not greater than 0.2 mm. In this embodiment, a magnetic isolation sheet 66 is provided between the magnetic conductor 65 and the yoke 60, and the gap between the magnetic isolation sheet 66 and the opposite magnet short-circuit surface is preferably not greater than 0.2 mm. By controlling the thickness of the magnetic isolation sheet, the matching effect of the short-circuit magnetic circuits φ3E, φ4E and the working magnetic circuit φ1E of the magnet can be better.

[0072] In this embodiment, the magnetic conductor 65 is in a planar sheet structure, and the magnetic conductor 65 is fixedly arranged on the side of the magnet 64 away from the yoke 60 to avoid interference between magnetic circuits as much as possible. Figure 13 A deformation example of this embodiment is shown. In this deformation example, the magnetic conductor 65A is a U-shaped sheet structure that semi-surrounds the magnet 64A, so that the magnetic conductor 65A and the yoke 60A can basically fully surround the magnet 64A, and can better shield the influence of the external magnetic field on the magnet 64A.

[0073] In this embodiment, one end of the yoke 60 away from its opening includes two adjacent right-angle connecting portions 67, 68. The magnet 64 is disposed close to one side where the two right-angle connecting portions 67, 68 are connected. The structure of the yoke 60 with this structure is simple and easy to manufacture.

[0074] Embodiment 7:

[0075] This embodiment provides a magnetic latching release actuator unit, which is basically similar to Embodiment 6. In this embodiment, a magnetic conductor is also provided outside the magnet 64B to form two short-circuit loops. Its structure and function are the same as those in Embodiment 6 and will not be described in detail. The difference between this embodiment and Embodiment 6 is that one end of the yoke 60B away from its opening includes an adjacent right-angle connecting portion 70 and an oblique-angle connecting portion 69. The magnet 64B is disposed close to the oblique-angle connecting portion 69. This structure can arrange the magnet 64B at an oblique-angle position of the frame-shaped yoke 60B, thereby reducing the volume of the entire magnetic latching release actuator unit.

[0076] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes in form and details made to the present invention without departing from the spirit and scope of the present invention defined by the appended claims all fall within the protection scope of the present invention.

Claims

1. A magnetic holding type tripping execution unit for triggering a tripping mechanism in a switching electrical appliance, comprising a yoke, an armature, a coil and a permanent magnet. The yoke includes a U-shaped yoke with an opening facing the armature. The permanent magnet is magnetically coupled to the yoke and transmits the permanent magnet magnetic flux through a permanent magnet working magnetic circuit formed by the yoke and the armature. The coil is wound around the yoke and transmits the coil magnetic flux that reduces the permanent magnet magnetic flux through a tripping drive magnetic circuit formed by the yoke and the armature, characterized in that: There are two short-circuit magnetic circuits that short-circuit the permanent magnet on the outside of the permanent magnet.

2. The magnetic latching trip actuator unit according to claim 1, wherein: The path of one of the short-circuit magnetic circuits does not overlap with the path of the tripping drive magnetic circuit.

3. The magnetic latching trip actuator unit according to claim 1, wherein: The yoke includes a first yoke iron and a second yoke iron. The first yoke iron and the second yoke iron are combined to form the U-shaped yoke. The first yoke iron and the second yoke iron sandwich the permanent magnet. The first yoke iron and the second yoke iron enclose to form a frame structure that basically completely surrounds the permanent magnet, so that two short-circuit magnetic circuits that short-circuit the permanent magnet are formed on the frame structure.

4. The magnetic latching trip actuator unit according to claim 3, wherein: The U-shaped yoke includes a first yoke arm and a second yoke arm that respectively form a first pole face and a second pole face. The first yoke arm is arranged on the first yoke iron as a winding segment around which the coil is wound. The second yoke arm is arranged on the second yoke iron. It is defined that the armature is located above the yoke. The first yoke arm and the second yoke arm extend vertically upward and downward at intervals.

5. The magnetic holding type tripping execution unit according to claim 4, wherein: The frame structure is spaced from the first yoke arm, so that there is a winding space for winding the coil in the circumferential direction of the entire first yoke arm.

6. The magnetic latching trip actuator unit according to claim 4, wherein: The first yoke iron is of an "L" shape and includes the first yoke arm and a first horizontal straight arm connected to the lower end of the first yoke arm. The second yoke iron is of an "h" shape and includes the second yoke arm, a second horizontal straight arm connected to the lower end of the second yoke arm, and a first vertical arm and a second vertical arm that are spaced and connected to the lower end of the second horizontal straight arm and extend downward. The first horizontal straight arm, the second horizontal straight arm, the first vertical arm and the first yoke arm enclose to form a frame structure that basically completely surrounds the permanent magnet; or, the first yoke iron is of a "U" shape and includes the first yoke arm, a first horizontal straight arm connected to the lower end of the first yoke arm, and a third vertical arm connected to the end of the first horizontal straight arm away from the first yoke arm and extending upward. The second yoke iron is of a "Z" shape and includes the second yoke arm, a second horizontal straight arm connected to the lower end of the second yoke arm, and a fourth vertical arm connected to the end of the second horizontal straight arm away from the second yoke arm and extending downward. The first horizontal straight arm, the second horizontal straight arm, the third vertical arm and the fourth vertical arm enclose to form a frame structure that basically completely surrounds the permanent magnet.

7. The magnetic latching trip actuator unit according to claim 6, characterized in that: The directions in which the two magnetic poles of the permanent magnet face each other are along the vertical up-and-down direction or along the horizontal direction perpendicular to the vertical up-and-down direction.

8. The magnetic holding type tripping execution unit according to claim 3, characterized in that: The path of one of the short-circuit magnetic circuits does not overlap with the path of the tripping drive magnetic circuit.

9. The magnetic holding type trip execution unit according to claim 8, characterized in that: The U-shaped yoke includes a first yoke arm and a second yoke arm that respectively form a first pole face and a second pole face. The first yoke arm is arranged on the first yoke iron as a winding segment around which the coil is wound. The second yoke arm is arranged on the second yoke iron. The first yoke arm and the second yoke arm extend in the same direction at intervals. The tripping drive magnetic circuit is arranged within the interval span range of the first yoke arm and the second yoke arm. The permanent magnet is arranged outside the interval span range of the first yoke arm and the second yoke arm, so that the path of one of the short-circuit magnetic circuits does not overlap with the path of the tripping drive magnetic circuit.

10. The magnetic holding type trip execution unit according to claim 9, wherein: The armature is defined as being located on the upper side of the yoke, the first yoke arm and the second yoke arm extending vertically up and down at intervals, the first yoke comprising the first yoke arm, a first horizontal arm connected to the lower end of the first yoke arm, and a fifth vertical arm connected to the first horizontal arm and extending upward, the fifth vertical arm being close to the second yoke arm, the second yoke comprising the second yoke arm, a second horizontal arm connected to the lower end of the second yoke arm, and a sixth vertical arm connected to the second horizontal arm away from one end of the second yoke arm and extending downward, the magnetic steel being arranged on a side of the fifth vertical arm away from the first yoke arm, the first yoke arm, the second yoke arm, the first horizontal arm, the fifth vertical arm and the armature forming the release drive magnetic circuit, the first horizontal arm, the second horizontal arm, the fifth vertical arm and the sixth vertical arm enclosing each other to form a frame structure that basically completely surrounds the magnetic steel.

11. The magnetic latching trip actuator unit according to claim 9, wherein: The armature is defined as being located on the upper side of the yoke, the first yoke arm and the second yoke arm extending vertically up and down at intervals, the first yoke being a "U"-shaped structure, comprising the first yoke arm, a first horizontal arm connected to the lower end of the first yoke arm, and a seventh vertical arm connected to the first horizontal arm away from one end of the first yoke arm and extending upward, the second yoke comprising a second yoke arm and a second horizontal arm, wherein the second yoke arm extends downward to be close to the first horizontal arm, the second horizontal arm and the second yoke arm are crossed in a "T" shape, the magnetic steel is arranged on the side of the second yoke arm away from the first yoke arm, the first yoke arm, the second yoke arm, the first horizontal arm and the armature constitute the tripping drive magnetic circuit, the first horizontal arm, the second horizontal arm, the second yoke arm and the seventh vertical arm are enclosed to form a frame structure that basically completely surrounds the magnetic steel.

12. The magnetic latching trip actuator unit according to claim 11, characterized in that: One end of the second horizontal arm away from the second yoke arm is also connected to an eighth vertical arm extending upward, and the eighth vertical arm is close to the seventh vertical arm.

13. The magnetic latching trip actuator unit according to claim 1, wherein: The magnetic yoke is a single yoke iron with a U-shaped structure, and its U-shaped opening faces the armature. The magnetic steel is a strip structure. The magnetic steel is fixedly arranged on the outside of the U-shaped enclosing area of ​​the magnetic yoke. A non-magnetic extreme end of the magnetic steel is arranged close to the magnetic yoke, thereby forming a short-circuited magnetic circuit on the magnetic yoke that short-circuits the magnetic steel. It also includes a magnetic conductor, which is fixedly arranged on the outside of the magnetic steel to form another short-circuited magnetic circuit that short-circuits the magnetic steel.

14. The magnetic holding type tripping execution unit according to claim 13, characterized in that: The magnetic conductor is fixedly arranged on a side of the magnetic steel away from the magnetic yoke.

15. The magnetic latching trip actuator unit according to claim 13, wherein: A magnetic isolation sheet is provided between the magnetic conductor and the magnetic steel.

16. The magnetic holding type trip execution unit according to claim 13, characterized in that: The magnetic conductor is in a planar sheet structure or a U-shaped sheet structure that half surrounds the magnetic steel.

17. The magnetic latching trip actuator unit according to claim 13, wherein: The end of the magnetic yoke away from the opening thereof includes two adjacent right-angle connecting parts, and the magnetic steel is arranged close to a side edge where the two right-angle connecting parts are connected.

18. The magnetic latching trip actuator unit according to claim 13, characterized in that: The end of the yoke away from the opening thereof comprises an adjacent right-angle connection portion and an oblique-angle connection portion, and the magnetic steel is arranged close to the oblique-angle connection portion.

19. A switching device, comprising a tripping mechanism and a tripping execution unit for triggering the tripping mechanism, characterized in that: The tripping execution unit is a magnetic holding type tripping execution unit as described in any one of claims 1-18.

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