Under-voltage release

Abstract

The present invention relates to the field of low-voltage electrical appliances, and particularly relates to an under-voltage release, which comprises a coil assembly, a static iron core, a moving iron core and a spring. The static iron core, the spring and the moving iron core are sequentially arranged in the middle thereof along the axial direction of the coil assembly; the coil assembly comprises a coil skeleton and an exciting coil sleeved on the coil skeleton; the coil assembly further comprises a detection coil sleeved on the coil skeleton; the induced electromotive force of the detection coil changes with the movement of the moving iron core; the under-voltage release of the present invention can monitor its own working state in real time.

Description

Technical Field

[0001] The present invention relates to the field of low-voltage electrical appliances, and particularly to an under-voltage release. Background Art

[0002] The under-voltage release is an important control component of an air circuit breaker. When an under-voltage fault occurs in the system circuit where it is located, the under-voltage release operates to trip the circuit breaker.

[0003] Existing under-voltage releases do not have a status monitoring function. When the circuit breaker trips due to an under-voltage fault, users cannot know immediately that the circuit breaker trips due to an under-voltage fault. In addition, with the development of Internet of Things technology, the system circuit needs to monitor the real-time status and operating life of the circuit breaker and its accessories, and existing under-voltage releases cannot meet this requirement. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide an under-voltage release that can monitor its own working status in real time.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] An under-voltage release includes a coil assembly 4, a static iron core 2, a moving iron core 5 and a spring 3. The static iron core 2, the spring 3 and the moving iron core 5 are sequentially arranged axially in the middle of the coil assembly 4; the coil assembly 4 includes a coil skeleton 41 and an exciting coil 42 sleeved on the coil skeleton 41; the coil assembly 4 further includes a detection coil 43 sleeved on the coil skeleton 41; the induced electromotive force of the detection coil 43 changes with the movement of the moving iron core 5.

[0007] Preferably, both ends of the moving iron core 5 are respectively an inner end of the moving iron core and an outer end of the moving iron core;

[0008] When the voltage of the circuit where the under-voltage release is located is normal and the under-voltage release has no fault, the inner end of the moving iron core is attracted to the static iron core 2 and inserted in the middle of the detection coil 43; when the circuit where the under-voltage release is located is under-voltage or the under-voltage release has a fault, weakening or disappearing the magnetic field generated by the exciting coil 42, the spring 3 pushes the moving iron core 5 to move the inner end of the moving iron core towards the outside of the detection coil 43.

[0009] Preferably, when the circuit where the under-voltage release is located is under-voltage or the under-voltage release has a fault, weakening or disappearing the magnetic field generated by the exciting coil 42, the spring 3 pushes the moving iron core 5 to completely move the inner end of the moving iron core out of the detection coil 43.

[0010] Preferably, when the voltage of the circuit where the under-voltage release is located is normal and the under-voltage release is free of faults, the induced electromotive force of the detection coil 43 is U1; when the circuit where the under-voltage release is located is under-voltage or the under-voltage release has a fault, the induced electromotive force of the detection coil 43 is U2; the position of the moving iron core 5 can be judged based on U1 and U2.

[0011] Preferably, the coil bobbin 41 includes an installation cavity 40 provided in the middle thereof and extending along the axial direction of the coil bobbin 41. The static iron core 2, the spring 3 and the moving iron core 5 are all arranged in the installation cavity 40; the static iron core 2 is fixedly arranged at one end of the installation cavity 40, and the moving iron core 5 is slidably arranged at the other end of the installation cavity 40.

[0012] Preferably, both the static iron core 2 and the moving iron core 5 are made of high-permeability materials; the static iron core 2 is provided with a static iron core spring limiting groove, and the inner end of the moving iron core is provided with a moving iron core spring limiting groove. Both ends of the spring 3 are respectively arranged in the static iron core spring limiting groove and the moving iron core spring limiting groove.

[0013] Preferably, the detection coil 43 is sleeved on the axial middle part of the coil bobbin 41, and one end is arranged close to the static iron core 2.

[0014] Preferably, the detection coil 43 and the excitation coil 42 are sequentially sleeved outside the coil bobbin 41, and the detection coil 43 is located at one end of the excitation coil 42.

[0015] Preferably, the under-voltage release further includes a circuit board 6. The circuit board 6 is arranged on the radial side of the coil assembly 4, and the excitation coil 42 and the detection coil 43 are respectively connected to the circuit board 6.

[0016] Preferably, the coil assembly 4 further includes a fitting pin 7 arranged on the coil bobbin 41 and in plug-in fit with the circuit board 6. The excitation coil 42 and the detection coil 43 are respectively connected to the circuit board 6 through the fitting pin 7.

[0017] Preferably, the under-voltage release further includes a housing 1. The coil assembly 4 and the circuit board 6 are respectively fixedly arranged on the housing 1.

[0018] In the under-voltage release of the present invention, a detection coil 43 is provided. When the circuit where the under-voltage release is located is under-voltage or the under-voltage release has a fault, and the magnetic field generated by the excitation coil 42 weakens or disappears, the spring 3 pushes the moving iron core 5 to move the inner end of the moving iron core outside the detection coil 43, so that the induced electromotive force of the detection coil 43 changes significantly. Based on the change of the induced electromotive force of the detection coil 43, the position of the moving iron core 5 can be judged, realizing the real-time monitoring of the working state of the under-voltage release.

[0019] In addition, when the voltage of the circuit where the under-voltage release of the present invention is located is under-voltage or the under-voltage release fails, and the magnetic field generated by the exciting coil 42 weakens or disappears, the spring 3 pushes the moving iron core 5 to completely move the inner end of the moving iron core out of the detection coil 43, which is beneficial to increasing the magnetic field change in the detection coil 43 as much as possible and improving the accuracy of the judgment result of the position of the moving iron core 5 and the working state of the under-voltage release.. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the under-voltage release of the present invention, and its moving iron core assembly is in the attracted position;

[0021] Figure 2 is a schematic structural diagram of the under-voltage release of the present invention, and its moving iron core assembly is in the tripped position;

[0022] Figure 3 is a schematic structural diagram of the coil assembly of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0023] The following further describes the specific implementation manners of the under-voltage release of the present invention in conjunction with the Figures 1-3 embodiments given. The under-voltage release of the present invention is not limited to the descriptions of the following embodiments.

[0024] The under-voltage release of the present invention includes a coil assembly 4, a static iron core 2, a moving iron core 5 and a spring 3. The static iron core 2, the spring 3 and the moving iron core 5 are sequentially arranged in the middle of the coil assembly 4 along the axial direction; the coil assembly 4 includes a coil skeleton 41 and an exciting coil 42 sleeved on the coil skeleton 41; the coil assembly 4 further includes a detection coil 43 sleeved on the coil skeleton 4; the induced electromotive force of the detection coil 43 changes with the movement of the moving iron core 5.

[0025] The two ends of the moving iron core 5 are respectively the inner end and the outer end of the moving iron core; when the voltage of the circuit where the under-voltage release is located is normal and the under-voltage release has no fault, the inner end of the moving iron core is attracted to the static iron core 2 and inserted in the middle of the detection coil 43; when the voltage of the circuit where the under-voltage release is located is under-voltage or the under-voltage release fails, and the magnetic field generated by the exciting coil 42 weakens or disappears, the spring 3 pushes the moving iron core 5 to move the inner end of the moving iron core towards the outside of the detection coil 43. The induced electromotive force of the detection coil 43 changes with the movement of the moving iron core 5. According to the change of the induced electromotive force of the detection coil 43, the position of the moving iron core 5 can be judged, and the real-time monitoring of the working state of the under-voltage release is realized.

[0026] The under-voltage release of the present invention, when the circuit where the under-voltage release is located has an under-voltage or the under-voltage release fails, causing the magnetic field generated by the excitation coil 42 to weaken or disappear, the spring 3 pushes the moving iron core 5 to move the inner end of the moving iron core outside the detection coil 43, causing a significant change in the induced electromotive force of the detection coil 43. Based on the change in the induced electromotive force of the detection coil 43, the position of the moving iron core 5 can be judged, realizing the real-time monitoring of the working state of the under-voltage release.

[0027] Preferably, as Figure 2 shown, when the circuit where the under-voltage release of the present invention is located has an under-voltage or the under-voltage release fails, causing the magnetic field generated by the excitation coil 42 to weaken or disappear, the spring 3 pushes the moving iron core 5 to completely move the inner end of the moving iron core out of the detection coil 43, which is beneficial to increasing the magnetic field change in the detection coil 43 as much as possible and is beneficial to improving the accuracy of the judgment result of the position of the moving iron core 5 and the working state of the under-voltage release.

[0028] It should be noted that for the under-voltage release of the present invention, when the circuit where it is located has an under-voltage or the under-voltage release fails and the magnetic field of the excitation coil 42 weakens, the spring 3 does not necessarily push the moving iron core 5 to release the suction cooperation with the static iron core 2 and move the inner end of the moving iron core outside the detection coil 43. Instead, the above situation will occur only when the magnetic field generated by the excitation coil 42 is less than the magnetic field setting threshold; if the magnetic field generated by the excitation coil 42 disappears, the spring 3 will definitely push the moving iron core 5 to release the suction cooperation with the static iron core and move the inner end of the moving iron core outside the detection coil 43.

[0029] Preferably, when the voltage of the circuit where the under-voltage release of the present invention is located is normal and the under-voltage release has no fault, the induced electromotive force of the detection coil 43 is U1; when the circuit where the under-voltage release of the present invention is located has an under-voltage or the under-voltage release fails, the induced electromotive force of the detection coil 43 is U2; based on U1 and U2, the position of the moving iron core 5 can be judged. Further, as Figure 1 and 2As shown in the figure, the under-voltage release of the present invention further includes a circuit board 6. The circuit board 6 is respectively connected to the excitation coil 42 and the detection coil 43. The induced electromotive force U1 forms a loop through the circuit board 6 and obtains a loop current I1, and the induced electromotive force U2 forms a loop through the circuit board 6 and obtains a loop current I2. By comparing the difference between the loop current I1 and the loop current I2, the position of the moving iron core 5 can be judged, and thus the working state of the under-voltage release can be judged, that is: when the difference between the loop current I1 and the loop current I2 ≤ the set threshold, the moving iron core 5 still attracts and combines with the static iron core 2, and the under-voltage release is in a normal working state; when the difference between the loop current I1 and the loop current I2 > the set threshold, the moving iron core 5 is pushed by the spring 3 and separated from the static iron core 2, and the inner end of the moving iron core of the moving iron core 5 moves out of the detection coil 43, and the under-voltage release is in a tripping state. Further, the induced electromotive force U1 and the induced electromotive force U2 can be obtained through simulation or test.

[0030] As Figures 1-3 shown, it is an embodiment of the under-voltage release of the present invention.

[0031] As Figures 1-3 shown, the under-voltage release of the present invention includes a coil assembly 4, a static iron core 2, a moving iron core 5 and a spring 3. The static iron core 2, the spring 3 and the moving iron core 5 are sequentially arranged in the middle along the axial direction of the coil assembly 4; the coil assembly 4 includes a coil skeleton 41 and an excitation coil 42 and a detection coil 43 sleeved on the coil skeleton 41 respectively; both ends of the moving iron core 5 are the inner end of the moving iron core and the outer end of the moving iron core. As Figure 1 shown, when the voltage of the circuit where the under-voltage release of the present invention is located is normal and the under-voltage release has no fault, the inner end of the moving iron core attracts and combines with the static iron core 2 and is inserted in the middle of the detection coil 43; as Figure 2 shown, when the circuit where the under-voltage release of the present invention is located is under-voltage or the under-voltage release fails, when the magnetic field generated by the excitation coil 42 weakens or disappears, the spring 3 pushes the moving iron core 5 to move the inner end of the moving iron core outward of the detection coil 43.

[0032] It should be noted that when the under-voltage release of the present invention is used for a circuit breaker, the outer end of the moving iron core is in driving cooperation with the operating mechanism of the circuit breaker. When the circuit where the under-voltage release is located is under-voltage or the under-voltage release fails, the moving iron core 5 is ejected by the spring 3, and the outer end of the moving iron core drives the operating mechanism to act, so that the circuit breaker opens or trips, cutting off the circuit where the under-voltage release is located.

[0033] Preferably, as Figure 2 shown, when the circuit where the under-voltage release of the present invention is located is under-voltage or the under-voltage release fails, when the magnetic field generated by the excitation coil 42 weakens or disappears, the spring 3 pushes the moving iron core 5 to completely move the inner end of the moving iron core out of the detection coil 43.

[0034] Preferably, as Figure 1As shown, when the voltage of the circuit where the under-voltage release of the present invention is located is normal and the under-voltage release has no fault, the induced electromotive force of the detection coil 43 is U1; as Figure 2 shown, when the circuit where the under-voltage release of the present invention is located is under-voltage or the under-voltage release has a fault, the induced electromotive force of the detection coil 43 is U2; the position of the moving iron core 5 can be judged according to U1 and U2. Further, as Figure 1 and 2 shown, the under-voltage release of the present invention further includes a circuit board 6, the circuit board 6 is arranged on the radial side of the coil assembly 4, and the exciting coil 42 and the detection coil 43 are respectively connected to the circuit board 6. Further, the circuit board 6 judges the position of the moving iron core 5 and the working state of the under-voltage release according to the induced electromotive force U1 and the induced electromotive force U2.

[0035] Preferably, the under-voltage release further includes a detection circuit board connected to the detection coil 43, and the detection circuit board judges the position of the moving iron core 5 and the working state of the under-voltage release according to the induced electromotive force U1 and the induced electromotive force U2. Further, the detection coil 43 is connected to the detection circuit board through the circuit board 6.

[0036] Preferably, as Figures 1-3 shown, the coil assembly 4 further includes a splicing pin 7 arranged on the coil bobbin 41 and in plug-in fit with the circuit board 6, and the exciting coil 42 and the detection coil 43 are respectively connected to the circuit board 6 through the splicing pin 7. Specifically, as Figure 3 shown, the coil assembly 4 includes 4 splicing pins 7 arranged side by side at intervals, the exciting coil 42 is connected to the circuit board 6 through two splicing pins 7, and the detection coil 43 is connected to the circuit board 6 through the other two splicing pins 7.

[0037] Preferably, as Figure 3 shown, the coil bobbin 41 includes an installation cavity 40 arranged in the middle thereof and extending along the axial direction of the coil bobbin 41, and the static iron core 2, the moving iron core 5 and the spring 3 are all arranged in the installation cavity 40; the static iron core 2 is fixedly arranged at one end of the installation cavity 40, and the moving iron core 5 is slidably arranged at the other end of the installation cavity 40. Further, as Figure 1 and 2 shown, the static iron core 2 is provided with a static iron core spring limiting groove, the moving iron core 5 is provided with a moving iron core spring limiting groove, and both ends of the spring 3 are respectively arranged in the static iron core spring limiting groove and the moving iron core spring limiting groove.

[0038] Preferably, as Figure 1 and 2 shown, the detection coil 43 is sleeved on the axial middle part of the coil bobbin 41, and one end is arranged close to the static iron core 2. Further, as Figures 1-3As shown, the detection coil 43 and the excitation coil 42 are successively sleeved outside the coil bobbin 41, and the detection coil 43 is located at one end of the excitation coil 42. Specifically, as Figure 1 and 2 shown, one end of the detection coil 43 is adjacent to the static iron core 2 in the axial direction of the coil bobbin 41 and is spaced in the radial direction of the coil bobbin 41. When the voltage of the circuit where the under-voltage release is located is normal and the under-voltage release has no fault, the inner end of the moving iron core 5 is attracted to and inserted into the middle of the detection coil 43 as its iron core. When the circuit where the under-voltage release is located is under-voltage or the under-voltage release has a fault, the moving iron core 5 is pushed by the spring 3, so that the inner end of the moving iron core completely moves out of the middle of the detection coil 43. At this time, the static iron core 2 and the moving iron core 5 are respectively located outside both ends of the detection coil 43, making the detection coil 43 completely hollow, which is beneficial to increasing the change of the magnetic field where the detection coil 43 is located.

[0039] Preferably, both the static iron core 2 and the moving iron core 5 are made of high-permeability materials, ensuring the good magnetic permeability of the static iron core 2 and the moving iron core 5 and the operating performance of the moving iron core 5. Further, both the static iron core 2 and the moving iron core 5 are made of pure iron for electrical engineering.

[0040] Preferably, as Figure 1 and 2 shown, the under-voltage release of the present invention further includes a housing 1, and the coil assembly 4 and the circuit board 6 are respectively fixed on the housing 1.

[0041] Specifically, as Figure 1 and 2 shown in the direction, the coil assembly 4 and the circuit board 6 are respectively fixedly connected to the housing 1. The circuit board 6 is arranged on the left side of the coil assembly 4, and a fitting pin 7 for plugging and matching with the circuit board 6 is provided on the left side of the coil bobbin 41; the static iron core 2, the spring 3 and the moving iron core 5 are successively arranged in the middle of the coil assembly 4 from top to bottom. The static iron core 2 is fixedly arranged at the upper end of the installation cavity 40 of the coil bobbin 41, the moving iron core 5 is slidably arranged at the lower end of the installation cavity 40, and the lower end of the static iron core 2 is attracted and matched with the upper end of the moving iron core 5; the excitation coil 42 is sleeved at the lower end of the coil bobbin 41 opposite to the moving iron core 5, the detection coil 43 is sleeved in the middle of the axial direction of the coil bobbin 41 and is located inside the upper end of the excitation coil 42, and the upper end of the detection coil 43 is adjacent to the lower end of the static iron core 42 in the axial direction of the coil assembly 4; as Figure 1 shown, when the voltage of the circuit where the under-voltage release of the present invention is located is normal and the under-voltage release has no fault, under the action of the magnetic field of the excitation coil 42, the spring 3 is compressed, the upper end of the moving iron core 5 is attracted to the lower end of the static iron core 2 and the inner end of the moving iron core at the upper end of the moving iron core 5 is inserted into the detection coil 43. At this time, the induced electromotive force of the detection coil 43 is U1, and a loop current I1 is obtained through the circuit board 6 to form a loop; as Figure 2As shown in the figure, when the voltage of the circuit where the under-voltage release of the present invention is located is under-voltage or the under-voltage release fails, the magnetic field of the excitation coil 42 weakens or disappears, the spring 3 expands and releases energy, pushing the moving iron core 5 downward, so that the inner end of the moving iron core moves out of the detection coil 43. The lower end of the static iron core 2 and the upper end of the moving iron core 5 are adjacent to the upper end and the lower end of the detection coil 43 respectively. The detection coil 43 is hollow, and at this time its induced electromotive force is U2, and a loop current I2 is obtained through the circuit board 6 to form a loop; the user compares the difference between the loop current I1 and the loop current I2 to judge the position of the moving iron core 5 and the working state of the under-voltage release.

[0042] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. An under-voltage release, comprising a coil assembly (4), a static iron core (2), a moving iron core (5) and a spring (3), the static iron core (2), the spring (3) and the moving iron core (5) are sequentially arranged axially in the middle of the coil assembly (4); the coil assembly (4) includes a coil skeleton (41) and an exciting coil (42) sleeved on the coil skeleton (41); characterized in that: The coil assembly (4) further includes a detection coil (43) sleeved on the coil bobbin (41); the induced electromotive force of the detection coil (43) changes with the movement of the moving iron core (5).

2. The under-voltage release according to claim 1, characterized in that: Both ends of the moving iron core (5) are the inner end and the outer end of the moving iron core respectively; When the voltage of the circuit where the under-voltage release is located is normal and the under-voltage release is free of faults, the inner end of the moving iron core is attracted to the static iron core (2) and inserted in the middle of the detection coil (43); when the circuit where the under-voltage release is located is under-voltage or the under-voltage release fails, causing the magnetic field generated by the excitation coil (42) to weaken or disappear, the spring (3) pushes the moving iron core (5) to move the inner end of the moving iron core towards the outside of the detection coil (43).

3. The under-voltage release according to claim 2, characterized in that: When the circuit where the under-voltage release is located is under-voltage or the under-voltage release fails, causing the magnetic field generated by the excitation coil (42) to weaken or disappear, the spring (3) pushes the moving iron core (5) to completely move the inner end of the moving iron core out of the detection coil (43).

4. The under-voltage release according to claim 1, characterized in that: When the voltage of the circuit where the under-voltage release is located is normal and the under-voltage release is free of faults, the induced electromotive force of the detection coil (43) is U1; when the circuit where the under-voltage release is located is under-voltage or the under-voltage release fails, the induced electromotive force of the detection coil (43) is U2; the position of the moving iron core (5) can be judged according to U1 and U2.

5. The under-voltage release according to claim 1, characterized in that: The coil bobbin (41) includes an installation cavity (40) arranged in the middle thereof and extending along the axial direction of the coil bobbin (41), and the static iron core (2), the spring (3) and the moving iron core (5) are all arranged in the installation cavity (40); the static iron core (2) is fixedly arranged at one end of the installation cavity (40), and the moving iron core (5) is slidably arranged at the other end of the installation cavity (40).

6. The under-voltage release according to claim 2 or 5, characterized in that: Both the static iron core (2) and the moving iron core (5) are made of high-permeability materials; the static iron core (2) is provided with a static iron core spring limit groove, the inner end of the moving iron core is provided with a moving iron core spring limit groove, and both ends of the spring (3) are respectively arranged in the static iron core spring limit groove and the moving iron core spring limit groove.

7. The under-voltage release according to claim 1, characterized in that: The detection coil (43) is sleeved on the axial middle part of the coil bobbin (41), and one end is arranged close to the static iron core (2).

8. The under-voltage release according to claim 7, characterized in that: The detection coil (43) and the excitation coil (42) are sequentially sleeved on the outside of the coil bobbin (41), and the detection coil (43) is located at one end of the excitation coil (42).

9. The under-voltage release according to claim 1, characterized in that: The under-voltage release further includes a circuit board (6), the circuit board (6) is arranged on the radial side of the coil assembly (4), and the excitation coil (42) and the detection coil (43) are respectively connected to the circuit board (6).

10. The under-voltage release according to claim 9, characterized in that: The coil assembly (4) further includes an assembly pin (7) arranged on the coil bobbin (41) and in plug-in fit with the circuit board (6), and the excitation coil (42) and the detection coil (43) are respectively connected to the circuit board (6) through the assembly pin (7); The under-voltage release further includes a housing (1), and the coil assembly (4) and the circuit board (6) are respectively fixedly arranged on the housing (1).

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